KR102188455B1 - Membrane formed article comprising polyester coating layer and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a membrane molded article having a roughness change rate (Mr, %) of 50% or less including an eco-friendly polyester coating layer and a method for manufacturing the same, and specifically, the membrane molded article according to the present invention has the embossing ability of the polyester coating layer located on the curved surface. It is excellent and has a smooth appearance by improving the bursting of the corners of the molded product, lifting of the exterior, whitening phenomenon, and deterioration of surface quality, and thus can be widely applied to interior materials for construction.

Description

Membrane molded product including polyester coating layer and its manufacturing method {MEMBRANE FORMED ARTICLE COMPRISING POLYESTER COATING LAYER AND MANUFACTURING METHOD THEREOF}

The present invention relates to a membrane molded article including a polyester coating layer, a method of manufacturing the same.

In general, decorative sheet paper is used on the surface of particles constituting the wood panel for the purpose of improving the aesthetics of products on the surface of wooden panels such as furniture, sinks, and doors for building interiors and extending the service life. The decorative sheet paper used herein is capable of three-dimensional thermoforming, and an example is used by processing three sides of a kitchen furniture door with decorative sheet paper.

Such decorative sheet paper enables to obtain various types of wood texture, improves the aesthetics and completeness of the product, and also plays a role of supplementing the disadvantages of the material.

In addition, the deco sheet or deco film used as decorative sheet paper forms three-dimensional protruding patterns on the surface of the sheet in the existing simple and flat surface design, and gives the surface embossing effect to realize the desired touch of the consumer, which is unique and There is a new type of product trend that can create a novel three-dimensional aesthetic.

Previously, polyvinyl chloride was widely used as a decorative sheet paper, but there was a limitation in that it was difficult to recycle and that there was a high possibility of generating harmful gases upon disposal. In addition, polyethylene terephthalate glycol (Polyethylene Terephthalate Glycol) is an eco-friendly material, but it is expensive in terms of price, so there is a limit to expanding its use, and molding is difficult. In the case of polypropylene, the unit cost of itself is low, but since it must be treated with a primer during processing, there is a difficulty in increasing the process.

There is an attempt to apply polyester, which is one of the eco-friendly materials, as an alternative to polyvinyl chloride, polyethylene terephthalate glycol, which are materials of the conventional decor sheet or decor film. However, polyester (Polyester) deco sheet or deco film has a lot of shortcomings compared to the polyvinyl chloride deco sheet or deco film in the process of coating or processing the molded product, and technically needs to be supplemented.

1: Korean Patent Publication No. 1999-0046504 (published on Jul. 5, 1999) 2: Domestic Patent Registration No. 10-0397033 (announced on Sep. 2, 2003)

An object of the present invention is that the roughness change rate (Mr, %) measured on the coating layer located on the non-curved surface and the curved surface of the membrane molded product is formed to be 50% or less, so that bending whitening or lifting phenomena substantially does not occur even in bent portions such as corners. It is to provide a membrane molded article having a smooth appearance and a method of manufacturing the same.

In order to achieve the above object, an aspect of the present invention provides a membrane molded article comprising a polyester coating layer, wherein the rate of change in roughness (Mr, %) of the membrane molded article represented by Equation 1 below is 50% or less.

[Equation 1]

In Equation 1, R _pa is a surface roughness value measured on the surface of the coating layer positioned on the non-curved surface of the membrane molded article, and R _ca is the surface roughness measured on the surface of the coating layer positioned on the curved surface of the membrane molded article Value.

The surface roughness value of the coating layer measured on the curved surface of the membrane molded article may be 1.0 μm or more.

The polyester coating layer may contain a polyester resin and may include a protective layer having a surface embossed thereon.

The polyester coating layer includes a base layer containing a polyester resin; And it is located on the base layer and a protective layer containing a polyester resin; may include.

The polyester coating layer may have an average thickness of 0.25 mm or more.

The polyester resin included in the polyester coating layer may include a neopentyl glycol residue as a diol repeating unit.

The polyester resin contained in the base layer and the surface layer each includes a dicarboxylic acid repeating unit and a diol repeating unit.

The diol repeating unit may include more than 30 mol% to 90 mol% of neopentyl glycol residues based on the total moles of the diol repeating unit.

The diol repeating unit may not contain an alicyclic diol moiety.

Another aspect of the present invention is a delay step of providing a preheated polyester deco film by leaving the polyester deco film in a preheating atmosphere of 120 to 150 ℃; And it provides a method for manufacturing a membrane molded article containing; and a molding step of preparing a membrane molded article including a polyester coating layer by covering the preheated polyester deco film on the uncoated molded article.

The delay step may maintain the preheating atmosphere for a delay time of 30 seconds or more.

The molding step may be performed for a molding time of 30 seconds or more in a molding atmosphere of 120 to 150 ℃.

The polyester decorative film may have a thickness of more than 0.25 mm.

The molding step may include applying a reduced pressure atmosphere to the uncoated molded article, and applying a pressing means to bring the preheated polyester deco film into close contact with the surface of the uncoated molded article.

The polyester decoration film may have an average roughness of 0.5 um or more after 100% stretching.

The membrane molded product and its manufacturing method of the present invention do not easily collapse and are well maintained when the embossed pattern of the deco film located on the bent or curved surface of the membrane molded product is well maintained without being broken. It is possible to provide a membrane molded article including an eco-friendly polyester coating layer having a smooth appearance by improving lift, whitening, and deterioration of surface quality.

1 is a cross-sectional view showing a cross section of a membrane molded article according to an embodiment of the present invention.
2 is a diagram illustrating a manufacturing process of a membrane molded article according to another embodiment of the present invention ((a) is before the membrane is formed and (b) is after the membrane is formed).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. The same reference numerals are assigned to similar parts throughout the specification.

Throughout this specification, the term "combination of these" included in the expression of the Makushi form means one or more mixtures or combinations selected from the group consisting of the constituent elements described in the expression of the Makushi form, and the constituent elements It means to include one or more selected from the group consisting of.

In the present specification, the "~" system may mean including a compound corresponding to "~" or a derivative of "~" in the compound. "Derivative" refers to a compound having a specific compound as a parent, the introduction of a functional group, oxidation, reduction, substitution of atoms, etc., to the extent that the structure and properties of the parent are not changed.

In the present specification, the meaning that B is located on A means that B is located directly on A or B is located on A while another layer is located between them, and B is located so as to contact the surface of A. It is limited to that and is not interpreted.

In the present specification, the singular expression is interpreted as meaning including the singular or plural, interpreted in context, unless otherwise specified.

In the present invention, the meaning of the difference between the value of A and the value of B means an absolute value unless otherwise specified. That is, even if B is smaller than A, the difference between A and B is expressed as a positive value equal to the difference between B and A.

The inventors of the present invention were developing a method of manufacturing a membrane molded product with excellent appearance and excellent durability by coating or laminating on the surface of molded products such as furniture, sinks, and doors using eco-friendly polyester deco film. In the case of manufacturing a molded product so that the surface roughness measured from the curved surface of the first film or molded product has a certain ratio compared to the surface roughness measured on the non-curved surface of the first film or molded product, it is excellent in concealment without causing any bending whitening or appearance lift. It was confirmed that a membrane molded article having excellent quality can be produced, and the present invention was completed. In addition, the present invention was completed by confirming the preheating conditions and molding conditions in the manufacturing process applied to the production of such a molded article.

1 is a diagram illustrating a cross-section of a membrane molded article according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a manufacturing process of a membrane molded article according to another embodiment of the present invention ((a) is , (b) is after membrane formation). Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 and 2.

In the membrane molded article 100 according to an embodiment of the present invention, the roughness change rate (Mr, %) of the membrane molded article represented by Equation 1 below is 50% or less.

[Equation 1]

In Equation 1, R _pa is the surface roughness value measured on the surface 22 of the coating layer located on the non-curved surface 22a of the membrane molded article, and R _ca is the curved surface 22b of the membrane molded article. It is a surface roughness value measured on the surface 22 of the covering layer to be located.

Here, the curved surface 22b refers to a portion having the largest curvature among parts where the surface of the molded product is bent at 60 to 120 degrees, and the non-curved surface 22a is a portion excluding the curved surface, and specifically, the surface of the molded product is 180 It means the flat part of the road.

The membrane molded article 100 may have a roughness change rate (Mr, %) of the membrane molded article represented by Equation 1 above from 0.1% to 45%, more specifically from 1 to 38%, and from 3 to 28% I can.

The molded article 100 having such a value means that the surface of the membrane molded article does not change significantly compared to the film surface before forming even after forming, and it means that the properties of the film are well maintained even if the curved surface or the bent surface is formed.

The membrane molded article 100 includes an uncoated molded article 10 and a polyester coating layer 20 positioned on the uncoated molded article and covering part or all of the uncoated molded article.

The polyester coating layer 20 has a non-curved surface 22a and a curved surface 22b on its surface.

The average roughness (Ra) for obtaining the roughness change rate (Mr, %) may be a value obtained by measuring the Ra value using a rough surface tester.

Specifically, the surface roughness value (R _pa ) on the coating layer located on the non-curved surface of the molded product is measured by a surface roughness meter such as a surface roughness tester (Rough Surface Tester, RST-Plus, Veeco/Wyko) before molding. The surface roughness value (R _ca ) on the coating layer located on the bent surface of the molded product is stretched (usually stretched to within 100%, but is not limited thereto) to increase the surface roughness value Ra at the surface of the bent part. It can be measured by the above method by measuring the change thereof.

The surface roughness value of the coating layer measured on the curved surface of the membrane molded article 100 may be 1.0 μm or more, and may be 0.3 to 5.0 μm. Membrane molded articles having these values can have excellent surface properties.

The polyester coating layer 20 includes a base layer 20a containing a polyester resin; And it is located on the base layer and may include a protective layer (20c) containing a polyester resin. In addition, the protective layer 20c may be a polyester resin-containing layer on which a surface emboss is formed.

The base layer 20a may be a colored layer containing a dye or pigment.

In addition, the polyester coating layer 20 may further include a pattern layer 20b positioned on one surface of the base layer and including a color or pattern on some or all of the base layer. In this case, the protective layer 20c may be included on the pattern layer 20b.

The pattern layer 20b is not particularly limited in color or three-dimensional pattern, for example, a marble pattern, a wood pattern, a carpet pattern flower pattern, a star pattern, a gravel pattern, a leaf pattern, an oval pattern, a circle, a square, a letter, etc. , Can contain all abstract patterns.

The membrane molded article 100 may have a thickness of the coating layer 20 measured on a non-curved surface of more than 0.25 mm, and may be 0.3 mm or more. In addition, the membrane molded article 100 may have a thickness of the coating layer 20 measured on a non-curved surface of less than 0.45 mm, and may be 0.40 mm or less. When the coating layer 20 having such a range is processed to be included in the membrane molded product 100, it is possible to manufacture a membrane molded product 100 having excellent appearance quality in which whitening phenomenon, lifting phenomenon, and the like do not substantially occur.

The polyester resin included in the base layer 20a and/or the protective layer 20c of the polyester coating layer 20 may include a neopentyl glycol repeating unit.

Specifically, the polyester resin included in the polyester coating layer includes a dicarboxylic acid repeating unit and a diol repeating unit.

The dicarboxylic acid is terephthalic acid (TPA), isophthalic acid (IPA), naphthalene dicarboxylic acid (NDC), cyclohexane dicarboxylic acid (CHDA), succinic acid, glutaric acid, orthophthalic acid, adipic acid, azelaic acid. , Sebacic acid, decanedicarboxylic acid, 2,5-furandicarboxylic acid, 2,5-thiophenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 4,4'-bibenzoic acid and derivatives thereof , Or any combination thereof.

Specifically, the dicarboxylic acid repeating unit may include a residue of terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, cyclohexane dicarboxylic acid, or any combination thereof, but is not limited thereto. More specifically, the dicarboxylic acid repeating unit may include a terephthalic acid residue, but is not limited thereto.

Specifically, the diol repeating unit includes a neopentyl glycol residue of greater than 30 to less than 90 mol% based on the total moles of the diol repeating unit. The diol repeating unit may include more than 30 to 80 mol% of neopentyl glycol residues based on the total moles of the diol repeating unit. The diol repeating unit may include more than 30 to 70 mol% of neopentyl glycol residues based on the total moles of the diol repeating unit. For example, the diol repeating unit may include a neopentyl glycol residue of greater than 30 to less than 60 mol% based on the total moles of the diol repeating unit.

When the content of the neopentyl glycol residue is within the above range, fairness by crystallization is excellent, and it is easy to obtain a desired intrinsic viscosity. In addition, in the resin to which neopentyl glycol is applied as above, it is particularly improved in interlayer thermal bonding properties and dyeing properties.This is a result obtained by interaction of side chains derived from neopentyl glycol with side chains linked to other main chains located adjacent to each other. I think.

The diol repeating unit is ethylene glycol (EG), diethylene glycol (DEG), (1,3-propanediol, 1,2-octanediol, 1,3-octanediol, 2,3-butanediol, 1,3- Butanediol, 1,4-butanediol, 1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1,5-pentanediol, 2,4-diethyl -1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,1-dimethyl-1,5-pentanediol, polyether glycol (e.g., PTMEG, PEG, PPG), or any thereof It may further include residues of a combination of.

Specifically, the diol repeating unit may further include a residue of ethylene glycol, diethylene glycol, polyether glycol, or a combination thereof, but is not limited thereto. More specifically, the diol repeating unit may further include an ethylene glycol residue, but is not limited thereto.

The diol repeating unit substantially does not contain an alicyclic diol moiety. For example, the diol repeating unit is substantially free of cyclohexanedimethanol (CHDM) residues. This is considered to be because the packing and bonding between the polymer main chains intended in the present invention may not be sufficiently induced due to the bulky structure of the alicyclic diol.

The membrane molded article 100 may be one in which whitening does not appear on the curved surface 22b observed from the surface.

The membrane molded article 100 may be one that does not exhibit an appearance lift phenomenon on the surface.

The manufacturing method of the membrane molded article 100 according to another embodiment of the present invention is (i) a delay step of preparing a preheated polyester deco film by leaving the polyester deco film 30 in a preheating atmosphere of 120 to 150°C. ; And (ii) a molding step of forming a membrane molded product 100 including a polyester coating layer 20 by covering the preheated polyester deco film on the uncoated molded product 10. Thereafter, it may further include a completion step including a temperature reduction process of reducing the temperature of the membrane molded article 100 that has been subjected to the delaying step and the forming step, and the completion step includes a trimming process of removing unnecessary films from the membrane molded article 100 It can be included more.

The polyester deco film 30 may have a thickness of more than 0.25 mm, and may be 0.30 mm or more. When the thickness of the polyester deco film 30 is 0.25 mm or less, there is a possibility that concealability may be insufficient in the bent portion of the membrane molded product 100 during the molding process described above.

The polyester deco film 30 may have a thickness of 0.5 mm or less, and may be 0.45 mm or less. When the thickness exceeds 0.5 mm, the possibility of occurrence of a lifting phenomenon in the membrane molded article 100 may increase.

The polyester deco film 30 may have a roughness of 0.5 um or more after 100% stretching, and may be 1.0 um or more. The polyester deco film 30 may have a roughness of 1.5 um or more and 2.0 um or more after 100% stretching. When the polyester deco film 30 is 100% stretched and the roughness is within the above range, since it has a roughness value of a certain level or higher even after being stretched, the properties of the film are well maintained even after being stretched, and excellent film properties are maintained even after membrane molding. It is possible to provide a polyester deco film 30 that is maintained.

The polyester deco film 30 is formed with the structure and components of the polyester coating layer 20 described above, and a detailed description of the polyester deco film 30 not mentioned above is the polyester coating layer 20 above. Since it is redundant with the description given in the above, the description is omitted.

The delay step is a process of softening the polyester deco film 30 before applying it to a subsequent molding step. In the preheating atmosphere, the deco film 30 is left for a certain period of time. It should have sufficient processing and adhesive properties.

Specifically, the preheating atmosphere applied to the delay step may be 120 to 150°C, 125 to 145°C, and 128 to 132°C. In such a temperature range, it is possible to induce sufficient softening and activation of adhesive properties of the diesel polyester deco film 30 by applying the delay step.

When the temperature of the preheating atmosphere is less than 120° C., the delay step is not sufficiently performed, so that adhesion may be lifted or whitening may occur. In addition, when the temperature of the preheating atmosphere exceeds 160° C., concealability may be insufficient or surface roughness may be too low.

The delay step may maintain the preheating atmosphere for a delay time of 30 seconds or more. The delay time may be 30 to 60 seconds, specifically 30 to 50 seconds. If the delay time is less than 30 seconds, whitening may occur during the molding process, and if it exceeds 60 seconds, the hiding property may be deteriorated.

The polyester deco film may be positioned on the uncoated molded article and the delay step may be performed to prepare a preheated polyester deco film. In addition, the delay step is performed in a space separate from the uncoated molded article to prepare a preheated polyester deco film, and it may be moved onto the uncoated molded article to perform a subsequent molding step. At this time, in the case of the former, since the molding step is also performed under an atmospheric condition in which temperature and pressure are controlled, the delay step can be performed in the same atmosphere, so that the process can be operated more efficiently, and the preheated polyester deco film It is also good that it can reduce the possibility of damage.

The forming step is a step of forming a membrane molded article 100 including a polyester coating layer 20 by covering the preheated polyester deco film 30 on the uncoated molded article 10, at 120 to 150°C. It may be carried out in a molding atmosphere, and the temperature of the molding atmosphere may be the same as or different from that of the preheating atmosphere.

The molding step may be performed for a molding time of 30 seconds or more in the preheating atmosphere, and may be performed for a molding time of 30 to 60 seconds. When the molding time is applied for less than 30 seconds, appearance lift or whitening may occur.

The molding step may be performed by applying a reduced pressure atmosphere around the uncoated molded article 10, and the preheated polyester deco film is applied to the uncoated polyester deco film using a pressurizing means 55 in a state in which the reduced pressure atmosphere is applied. It may include a process of intimate contact with the surface of the molded article. In this case, the pressing means 55 may have a temperature of the preheating atmosphere or the molding atmosphere.

The application of the reduced pressure atmosphere and the application of the pressurizing means may be applied sequentially or simultaneously.

The manufacturing method may be performed in the membrane forming apparatus 500.

The membrane forming apparatus 500 may include a pressure reducing means 51, a support 53 for supporting an uncoated molded product or a membrane molded product, and a pressing means 55, but is not limited thereto.

The application of the reduced pressure atmosphere may be performed by the pressure reducing means 51, and specifically, a vacuum plate may be used, but any device capable of applying the reduced pressure atmosphere may be applied without limitation.

The pressing means 55 adheres the deco film to the surface of the uncoated molded article by pressure, but the surface characteristics are adjusted so that deformation of the uncoated molded article 10 itself or damage to the deco film 30 does not occur. This may be applied, and specifically, an elastic substrate, a silicone tube, etc. having a shape corresponding to the uncoated molded article may be applied, but is not limited thereto.

In the molding step, the deco film 30 is in close contact with the surface of the uncoated molded article and adhered according to the characteristics of the deco film itself, and may have sufficient adhesive strength without a separate adhesive layer.

In the molding step, the deco film 30 is in close contact with the surface of the uncoated molded article and partially stretched according to the characteristics of the deco film itself, and whitening occurs substantially even at the curved surface and bent portion of the uncoated molded article. It is possible to manufacture the membrane molded article 100 so as not to do so.

The membrane molded article 100 manufactured in this way has the characteristics of the membrane molded article described above, and a more detailed description thereof is duplicated with the above description, and thus description thereof will be omitted.

The membrane molded article 100 to which the polyester deco film 30 according to the present invention is applied is eco-friendly, has excellent embossing ability on a curved surface, has a smooth appearance without lifting and whitening of the exterior, and has excellent weather resistance and surface hardness. It is more suitable for providing as interior materials for construction.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

1. Preparation Example 1: Preparation of copolymerized polyester resin

A polyester resin was prepared by sequentially applying an ester reaction and a polycondensation reaction to a composition containing a dicarboxylic acid compound and a diol compound. Specifically, terephthalic acid was applied as the dicarboxylic acid compound, and two kinds of ethylene glycol and neopentyl glycol were applied as the diol compound. In the composition for resin synthesis, the molar ratio of dicarboxylic acid: diol is 1:1.05 to 3.0, but the neopentyl glycol is applied in an amount of 20 to 90 mol% based on the total diol compound at 230 to 270°C and 0.1 The esterification reaction was carried out under conditions of to 3.0 kg/cm 2 to form an ester oligomer. A polycondensation catalyst and a stabilizer were further mixed with the thus-formed ester oligomer to carry out a polycondensation reaction to prepare an eco-friendly polyester resin.

2. Preparation Example 2: Preparation of copolymerized polyester film

A dye was added to the polyester resin to apply as a polyester resin for a base layer, and a dye not added to the polyester resin for a protective layer.

The polyester resin for the base layer and the polyester resin for the protective layer were respectively added to a calendering equipment, and a film was prepared by a calendering method. A pattern layer is formed on the substrate layer made of the polyester resin for the substrate layer by a conventional method, and the polyester resin for the protective layer is prepared as a film on the pattern layer by a calendering method to be laminated as a protective layer. An ester deco film was prepared.

3. Examples and Comparative Examples: Preparation of Membrane Sex Products

A plate-shaped MDF wooden panel having a certain volume applied to a door or the like was prepared as an uncoated molded article, and the polyester deco film prepared above was set on a vacuum plate so as to be placed on the wooden panel. The calendering equipment was adjusted to the preheating atmosphere, which is the molding temperature shown in Table 1 below.

The polyester decorative film was delayed for a delay time at the temperature shown in Table 1 below, and then the molding step was performed. That is, after the delay time elapsed, the polyester deco film was in close contact with the uncoated molded article by decompressing using a vacuum plate and pressing using a silicone tube heated to a molding temperature. Thereafter, the temperature was reduced and unnecessary residual film was removed to prepare a membrane molded article.

4. Evaluation of physical properties

For the membrane molded articles of Examples and Comparative Examples shown in Tables 1 and 2 below, physical properties were evaluated by the method of measuring physical properties as follows, and the results are shown.

(1) whitening phenomenon

The presence of whitening phenomenon in the polyester coating layer of the membrane molded article was visually checked, and if whitening was observed, it was evaluated as OK, and if whitening was not observed, it was evaluated as NG.

(2) Concealment

It was evaluated on the basis of whether the colored polyester decorative film covered the wooden panel well invisibly, and evaluated by placing a rating of 1 to 5 based on the following criteria.

1: Wood visibility strong level 2: Wood visibility medium level 3: Wood visibility weak level

4: Wood visibility is poor 5: Wood visibility is not

(3) Appearance evaluation

Whether or not the polyester coating layer of the membrane-molded product had appearance lift, wrinkles, cracks on the curved surface, etc. was evaluated as 1 to 5 based on the following criteria.

1: Cover layer lifted and bursting strong level 2: Cover layer lifted and bursting medium level

3: Cover layer lifted and burst weak level 4: Cover layer lifted and burst weak level

5: no lifting and bursting of the cladding layer

(4) Surface roughness measurement

A surface roughness value (Ra) was measured by applying a surface roughness tester (Rough Surface Tester, RST-Plus, Veeco/Wyko).

(5) Measurement of roughness after stretching the sheet 100%

After stretching the sheet using UTM 100%, the surface roughness value (Ra) was measured by applying a surface roughness tester on the stretched center part.

(6) Illuminance change rate (Mr, %)

It was measured using a surface roughness tester, and the surface roughness value (Rpa) on the coating layer located on the non-curved surface of the molded product was measured for the surface roughness value Ra of the non-curved portion with a surface roughness meter. The surface roughness value (Rca) on the coating layer located on the curved surface of the molded product is the surface roughness value Ra on the membrane film of the stretched area (the part where the surface of the molded product is bent by 60 to 120 degrees, usually stretched to within 100%). Measured.

The Rpa and Rca obtained in this way were substituted into the following Equation 1 to obtain the illuminance change rate (Mr, %).

[Equation 1]

The above evaluation results are divided into Tables 1 and 2 below.

unit Example 1 Example 2 Example 3 Example 4 Example 5 - thickness mm 0.35 0.35 0.35 0.35 0.45 - Delay time second 30 40 45 30 40 - Molding temperature ℃ 130 135 135 130 130 - Molding time second 50 40 35 50 40 - Bleaching phenomenon - OK OK OK OK OK - Concealment - 5 5 5 5 5 - Exterior
(Uplifting, etc.) - 5 5 5 5 5 - unit Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 thickness mm 0.35 0.35 0.35 0.35 0.35 0.25 Delay time second 10 20 40 40 40 40 Molding temperature ℃ 125 130 95 110 160 130 Molding time second 60 60 40 40 20 40 Bleaching phenomenon - NG NG NG NG OK NG Concealment - 5 5 5 5 2 One Exterior
(Uplifting, etc.) - 4 4 One One 5 5

Referring to Table 1, in the case of Comparative Examples 1 and 2 having relatively short delay times, it was confirmed that the whitening phenomenon appeared on the curved surface even if the concealability and appearance were good. In addition, as in Comparative Examples 3 and 4, when the temperature of the preheating atmosphere is too low, not only the whitening phenomenon but also the appearance lifting phenomenon appear together, and in the case of Comparative Example 5 where the temperature of the preheating atmosphere is too high, there is no appearance lift, but the hiding property is poor. I could confirm that. As in Comparative Example 6, when the thickness of the polyester deco film was too thin, the hiding power fell and even whitening phenomenon appeared.

Examples 1 to 5 all showed excellent physical properties in items such as whitening phenomenon, hiding property, and appearance.

unit Example 1 Example 2 Example 3 Comparative Example 3 Comparative Example 4 thickness mm 0.35 0.35 0.35 0.35 0.35 Delay time second 30 40 45 40 40 Molding temperature ℃ 130 135 135 95 160 Molding time second 50 40 35 40 20 Bleaching phenomenon - OK OK OK NG OK Concealment - 5 5 5 5 2 Exterior
(Uplifting, etc.) - 5 5 5 One 5 Roughness after stretching the sheet 100% um 1.7 2.1 2.3 2.8 0.7 Illuminance change rate % 43% 30% 23% 7% 77%

Referring to the results in Table 2, in the case of Examples 1 to 3, the rate of change in roughness evaluated based on the roughness of the bent portion and the non-bent portion measured on the coating layer coated on the molded product was 50% or less, even after membrane molding. It was confirmed that the surface roughness was maintained. This is a result showing that the emboss formed on the deco film is well maintained above a certain level even after processing as a coating layer. On the other hand, in the case of Comparative Example 4, when the preheating atmosphere temperature was too high, the illuminance change rate was considerably large. This was evaluated to have sufficient hiding power when applied to a product due to its somewhat low hiding power when applied with not only the coating layer formed of the decor sheet but also other films.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

100: membrane molded product 10: uncoated molded product
20: polyester coating layer 20a: base layer
20b: pattern layer 20c: protective layer
22: the surface of the polyester coating layer 22a: non-curved surface
22b: curved surface 30: polyester decorative film
500: membrane forming apparatus 51: depressurization means
53: support 55: pressing means

Claims (13)

A membrane molded product comprising a polyester coating layer,
The rate of change in roughness (Mr, %) of the membrane molded product represented by Equation 1 below is 50% or less,
The polyester resin contained in the polyester coating layer contains a neopentyl glycol residue as a diol repeating unit,
Membrane molded article comprising neopentyl glycol residues of more than 30 mol% to 90 mol% or less of the total diol repeating unit;
[Equation 1]

In Equation 1 above,
The R _pa is a surface roughness value measured on the coating layer positioned on the non-curved surface of the membrane molded article, and R _ca is a surface roughness value measured on the coating layer positioned on the curved surface of the membrane molded article. The method of claim 1,
The membrane molded article, wherein the coating layer has a surface roughness value of 1.0 μm or more, measured on a curved surface of the membrane molded article. The method of claim 1,
The polyester coating layer includes a protective layer containing a polyester resin having a surface embossed on its surface. delete The method of claim 1,
The polyester coating layer has an average thickness of 0.25 mm or more. delete delete A delay step of preparing a preheated polyester decor film by leaving the polyester decor film in a preheating atmosphere of 120 to 150°C; And
Including; a molding step of providing a membrane molded article including a polyester coating layer by covering the preheated polyester deco film on an uncoated molded article,
The delay step maintains the preheating atmosphere for a delay time of 30 seconds to 60 seconds,
The polyester resin contained in the polyester coating layer contains a neopentyl glycol residue as a diol repeating unit,
A method for producing a membrane molded article comprising a neopentyl glycol residue of more than 30 mol% to 90 mol% or less of the total diol repeating unit. delete The method of claim 8,
The molding step is to proceed for a molding time of 30 seconds or more in a molding atmosphere of 120 to 150 ℃, the method of manufacturing a membrane molded article. The method of claim 8,
The polyester deco film has a thickness of more than 0.25 mm, a method of manufacturing a membrane molded article. The method of claim 8,
The molding step includes applying a pressure-sensitive atmosphere to the uncoated molded article, and applying a pressing means to bring the preheated polyester deco film into close contact with the surface of the uncoated molded article. The method of claim 8,
The polyester deco film will have an average roughness of 0.5 um or more after 100% stretching, the method of manufacturing a membrane molded article.

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