JP2007269362A - Packaging bag and manufacturing method thereof - Google Patents

Abstract

In a packaging bag having resealing means, even if the contents are liquid, the risk of leakage is reduced as much as possible, and the contents and reseal until use (during transportation or storage). An object of the present invention is to provide a packaging bag that can be kept in a non-contact state with a member, can be easily opened at the time of use, and can be easily manufactured, and a manufacturing method thereof.
A container main body 11 having an opening at one end, and a sealing member 12 which is joined into the container main body and is folded inward of the container main body through a broken line to seal the opening. In the packaging bag 1, the sealing member 12 is formed to be thin along the broken line 121 of the sealing member and the thinned line 122 that intersects the planned opening line 122. A packaging bag (1) comprising one or a plurality of opening assist lines (123) and re-sealing means (124) capable of opening the opening opening formed by opening the planned opening line (122).
[Selection] Figure 1

Description

  The present invention relates to a packaging bag having resealing means such as a chuck seal and a method for manufacturing the same.

  Packaging bags with a zipper (engaged line fastener) can be used in a wide range of fields because the remaining contents can be resealed by engaging the chuck after consuming part of the contents. It is preferably used.

  However, many conventional packaging bags with a chuck have a structure in which the contents are in direct contact with the chuck portion (for example, Patent Document 1: Japanese Patent Laid-Open No. 2003-34338). There is a concern that the disengagement occurs, the contents leak to the outside of the chuck portion, the contents are scattered when the packaging bag is opened, and the hands are soiled. In particular, when the contents are in liquid form, fluid pressure is applied to every corner of the inner wall surface of the packaging bag due to external impact, so the engagement of the chuck portion is more likely to occur, and there is a great concern about leakage of the contents. It was. Further, in the packaging bag having such a structure, once the engagement of the chuck portion occurs, the contents may be clogged in the female member of the chuck portion, which may hinder resealing, and the packaging bag In the case where only the chuck portion is used as an isolation resealing member inside and outside the packaging bag after opening, there is a concern that the function cannot be sufficiently performed.

  In view of such circumstances, Patent Document 2: Japanese Patent Application Laid-Open No. 11-285518 and Patent Document 3: Japanese Patent Application Laid-Open No. 2001-299875 disclose devices that prevent the contents from contacting the chuck portion. A packaging bag has been proposed in which a partition is separately provided between the two to avoid direct contact between the contents and the chuck portion and to prevent leakage from the chuck portion. These are local weak heat-sealed parts and local narrow strong heat-sealed parts provided as partition walls, but in reality, it is not possible to strictly control the heat-seal strength of weak heat-sealed parts. It is difficult, and peeling of the strong heat seal portion may lead to destruction of the packaging bag itself. Therefore, in any case, there is a possibility that only the partition wall portion is stably broken and cannot be opened.

  On the other hand, Japanese Patent Application Laid-Open No. 10-72043 proposes a packaging bag in which a partition wall formed by a folded fold is provided between a chuck member and contents. The folded fold portion of such a packaging bag is formed by folding a film or arranging a V-shaped tape. The folded line portion of the folded fold portion has an easy-open line (perforation, minute hole array, mechanical line). It has also been proposed to provide weak lines, half-cut lines, etc. According to the packaging bag using such an easy-open line, even when the contents are liquid, the concern that the contents are leaked due to the engagement of the chuck portion due to impact during transportation or the like is reduced.

However, it is usually not easy to provide a half-cut line in which the depth of the groove of the folded fold is appropriately controlled on a packaging material film having a thickness of only about several μm to several tens of μm. There is a concern that the thin-walled portion does not remain and a hole is formed, and conversely, if the groove becomes too shallow, easy opening at the time of opening becomes difficult, impairing practicality. In particular, when the contents are liquid, if the depth of the groove is not uniform, even if the hole is not opened at the time when the half cut line is provided, a hole is opened in the thin part by a slight external impact. Leakage may occur.
Normally, the half-cut line is provided on the broken line part so that the balance between the fact that the hole is not opened (sealing is ensured) and the easy opening at the time of opening is provided on the broken line part. Appropriate half-cutting is necessary because it is necessary to keep in mind the variation in depth and width of the cut-off material and the thickness inherent in the packaging material film. Providing a line is quite difficult. For this reason, normally, priority is given to ensuring sealing, and bag making tends to sacrifice easy opening.
Furthermore, in such a packaging bag, it is necessary to concentrate the opening force in the valley, so if the fold line of the fold portion and the perforation are not completely aligned, the fold portion itself becomes a cushion and can be easily opened. There is also a problem that the function does not appear. Usually, it is extremely difficult to form a fold portion with a perforation line formed in advance on a bag making machine as a crease line.
From such a background, in a packaging bag having resealing means, even if the contents are liquid, the risk of leakage is reduced as much as possible, and until the contents are used (during transportation, storage, etc.) Therefore, it has been desired to develop a packaging bag that can maintain the resealing means in a non-contact state and can be easily opened at the time of use and can be easily manufactured.

JP 2003-34338 A Japanese Patent Laid-Open No. 11-285518 JP 2001-299875 A Japanese Patent Laid-Open No. 10-72043

  The present invention has been made in view of the above circumstances, and in a packaging bag having resealing means, the risk of leakage is reduced as much as possible even if the contents are liquid, and until the time of use (during transportation or It is an object of the present invention to provide a packaging bag that can maintain the contents and the reseal member in a non-contact state, and can be easily opened during use, and can be easily manufactured.

  As a result of intensive studies to achieve the above object, the present inventors have joined a container main body having an opening at one end thereof, and are joined into the container main body and folded into the container main body through a broken line. In the packaging bag comprising the sealing member for sealing the opening, the sealing member intersects the planned opening line formed thinly along the broken line of the sealing member and the planned opening line. By providing one or a plurality of opening assisting lines formed thin and thin, and a resealing means capable of opening the opening opening formed by opening the planned opening line, the contents can be opened. The risk of leakage is reduced as much as possible even when it is liquid, and the contents and resealing member can be kept in a non-contact state until use (during transportation, storage, etc.). To provide a packaging bag that can be easily opened and manufactured. Out, it has led to the completion of the present invention.

That is, this invention provides the following packaging bag and its manufacturing method.
[1] A packaging bag comprising: a container body having an opening at one end; and a sealing member bonded to the container body and folded inward of the container body via a broken line to seal the opening. The opening of the sealing member is thinly formed along the broken line of the sealing member, and one or more opening assists are formed thinly so as to intersect the opening planned line. A packaging bag comprising: a line; and a resealing means capable of opening the opening formed by opening the planned opening line so as to be freely closed.
[2] The sealing member has a base formed by folding a square sheet body into a V-shaped cross section, and is heat-sealed and fixed to the innermost layer of the container body only in the vicinity of both side edges of the base. The packaging bag according to [1].
[3] The packaging bag according to [1] or [2], wherein the resealing means is a chuck seal in which the groove portion and the ridge portion are engaged.
[4] The packaging bag according to any one of [1] to [3], wherein the opening of the container body is heat-sealed without passing through the sealing member.
[5] The packaging bag according to any one of [1] to [4], wherein the opening is for introducing an article into the packaging bag.
[6] The packaging bag according to any one of [1] to [5], wherein the packaging bag has a spout.
[7] The packaging bag according to any one of [1] to [6], wherein the packaging bag stores medical liquid.
[8] A container main body having an opening at one end, and a sealing member bonded to the container main body and folded inward of the container main body via a broken line to seal the opening, The sealing member is a thinned opening line formed along the broken line of the sealing member, and one or a plurality of opening assist lines formed thinly across the planned opening line, A method of manufacturing a packaging bag comprising: a re-sealing means capable of opening an opening formed by opening a planned opening line, wherein at least the opening auxiliary line is formed by laser processing. A method for manufacturing a packaging bag.
[9] The method for manufacturing a packaging bag according to [8], wherein a laser focus at the time of laser processing is set outside the sealing member.

  According to the present invention, in a packaging bag having resealing means, even if the contents are liquid, the risk of leakage is reduced as much as possible, and the contents can be used until use (during transportation or storage). Further, it is possible to provide a packaging bag that can be kept in a non-contact state with the resealing member, and can be easily opened at the time of use, and can be easily manufactured, and a manufacturing method thereof.

The packaging bag of the present invention includes a planned opening line formed thinly along a broken line of a sealing member folded inward of the container, and one or a plurality of formed thin lines intersecting the planned opening line. Since the auxiliary opening line is provided, stress is easily concentrated at the intersection of the planned opening line and the auxiliary opening line, and the planned opening line can be broken with a smaller force. In other words, even if the depth of the half-cut line (cut groove) provided along the broken line is set to a shallow depth (designed to ensure sealing), it is easy to open by hand due to the effect of the opening assist line. Therefore, it is possible to provide a packaging bag in which sealing and easy opening are compatible at a high level.
The reason why the stress tends to concentrate at the intersection of the planned opening line and the auxiliary opening line by providing the planned opening line and the auxiliary opening line is not clear, but is estimated as follows.
That is, when a force is applied by a fingertip, a nail or a blade applied at the time of opening, in the packaging bag of the above-mentioned Patent Document 4, there is a room for the folding line of the sealing member to swing in the front and back direction of the packaging bag. Since the sealing member itself acts like a cushioning material that releases the force, the planned opening line (easy opening line) is hard to break, but the packaging bag of the present invention is formed thinly along the broken line of the sealing material Since it is provided with the opened opening line and one or more opening auxiliary lines formed thinly so as to intersect the opening line, it is difficult for force to escape from the folded sealing member, and the opening line is opened. Even when the planned line is difficult to break, it is considered that the opening assist line is broken, which is a trigger, and the planned opening line is also broken and can be easily opened.
Therefore, in the present invention, the intersection of the opening schedule line and the opening assist line may be thinner and thinner than the opening schedule line or the opening assist line, or may be thinned to the same extent. Securement and easy opening can be achieved at a high level.

  Here, the container main body and the sealing member are usually formed using a packaging material film (hereinafter, when describing the “container main body”, the film and the sheet are collectively referred to as “film”). As a packaging material film, a general-purpose resin film having heat sealability on at least one surface can be used, for example, a polyolefin resin film such as polyethylene or polypropylene, or polyethylene terephthalate or polybutylene terephthalate on these resin films. A laminate film obtained by laminating a polyester film such as 6 nylon or 66 nylon, a resin film made of the above-described polyolefin (preferably uniaxially or biaxially stretched), or the like can be used. These resin films have a metal foil such as aluminum foil as a barrier layer, a resin layer such as vinylidene chloride or ethylene-vinyl alcohol copolymer, and inorganic materials such as silica, alumina, and metal aluminum deposited, coated, and laminated. Also good. It is also possible to use a plurality of these films laminated. In addition, when the visibility of the content is requested | required of the packaging bag of this invention, what is necessary is just to select the raw material and film structure of a packaging material film so that required visibility may be ensured. Moreover, as a film thickness of a resin film, it is 30-1000 micrometers normally, Preferably it is 90-400 micrometers.

The sealing member of the present invention is not particularly limited as long as the opening of the container body can be sealed. For example, a metal plate or paperboard may be fixed to the upper part of the innermost layer of the container body with an adhesive. It is preferable to heat-seal and fix a resin film or sheet (hereinafter, when “sealing member” is described, the film and sheet are collectively referred to as “sheet”) on the innermost layer of the container body. The resin sheet in this case may be a laminated multilayer resin sheet, but a single-layer resin sheet is sufficient.
The shape of the resin sheet is a square sheet body, and the sealing member has a base that is folded into a V-shaped cross section via a broken line formed at the center of the square sheet, and the base. A mode in which a resealing means such as a chuck seal that engages a groove portion and a ridge portion, which will be described later, is formed on the surface of the container body opening side.
When fixing the sealing member to the upper part of the innermost layer of the container body, it is preferable that only the vicinity of both side edges of the V-shaped substrate is heat-sealed and fixed to the innermost layer of the container body. By adhering in this way, the vicinity of the broken line of the sealing member becomes unsealed, and when the opening planned line is broken and opened, the broken mark becomes a free end. While effectively preventing the outflow, it is possible to prevent the resealing means provided on the sealing member from being pushed apart by the contents and separated. And before opening, it can prevent that an expected opening line breaks carelessly.
In addition, as long as the planned opening line formed on the sealing member is thin, the formation method and the cross-sectional shape are not particularly limited, but it is preferable to match the broken line of the sealing member. It is preferable to have. The width of the planned opening line is preferably about 0.5 to 5 mm. If it is narrower than this, it is difficult to match with the broken line, and if it is wider than this, the effect of the opening assist line may not be reflected. In addition, since the resin forming the sealing member is preferably a polyolefin that can be heat-sealed with the container body as described above, the planned opening line (thin portion) may be formed by a laser. It is more efficient and preferable to mold them together. Examples of such a molding method include extrusion molding and injection molding. Among these, extrusion molding suitable for continuous molding of a rectangular sheet-shaped (rectangular) sealing member is preferable. And as long as the opening assisting line formed in the sealing member is thin, the forming method and the cross-sectional shape are not particularly limited, but the opening assisting line is formed so as to intersect the planned opening line. It is difficult to form the sealing member at the time of extrusion molding. Therefore, it is preferable that the opening assist line is formed by laser processing. Laser processing may be performed in advance or at the time of bag making.
The width of the opening assist line is preferably 0.5 to 2 mm. When the width is smaller than 0.5 mm, the effect of the opening assist line is reduced, and when it is larger than 2 mm, workability at the time of laser processing is deteriorated. The length of the opening assist line is preferably 1 to 10 mm, and if it is smaller than 1 mm, the effect of the opening assist line is reduced, and if it is larger than 10 mm, the workability at the time of laser processing is deteriorated.
There are no particular restrictions on the formation pattern of the opening assistance line, and a plurality of opening assistance lines may be formed in parallel at equal intervals, or may be formed in non-parallel at appropriate intervals, or one opening The auxiliary line may be meandered so as to intersect the planned opening line at one place or a plurality of places.
In addition, the residual sheet thickness (sheet thickness of the thin portion) of the planned opening line or the auxiliary opening line is usually 1 to 100 μm, preferably 1 to 30 μm. Moreover, the ratio with respect to the sheet | seat thickness before unscheduled opening line or opening assistance line formation of residual sheet thickness is 1 to 99% normally, Preferably it is 20 to 70%. If the remaining sheet thickness of the planned opening line or the auxiliary opening line (and the ratio to the thickness before forming both lines) is smaller than 1 μm (1%), it is opened until use (during transportation or storage). A hole may be formed in the planned line or the auxiliary opening line, and if it is larger than 100 μm (99%), easy opening may be difficult.

  On the other hand, the resealing means formed on the sealing member is not particularly limited as long as it is a means that can open the opening that is formed by opening the planned opening line so as to be closable. It is possible to use a highly rigid ridge, for example, a wire and / or a resin ridge, or a surface fastener in which a large number of loops engage with a large number of ribs. It is preferable that the chuck seal engages with each other because the opening can be reliably opened and closed.

In the present invention, as a container body having an opening at one end, for example, a container body formed by stacking two films constituting the front and back surfaces and sealing the bottom edge and both side edges, one film Container bodies formed by folding bags, and container bodies in which gusset folds are formed on the bottom and both sides of the container bodies. Here, when the opening is formed on the upper edge of the container body, and the upper edge of the container body is heat-sealed without passing through the sealing member, the sealing member is isolated from the outside. Can do. And, for example, if a notch is formed directly under the heat seal part, it can be opened without damaging the sealing member when the packaging bag is cut and opened.
In the packaging bag of the present invention, the opening opening formed by opening the planned opening line can be used to dispense the stored contents, but new contents are added to the stored contents. It can be added or used to introduce new contents after the stored contents have been discharged.
Examples of packaging bags used in this way include packaging bags that contain so-called tube feeding nutrients such as medical liquids such as liquid foods administered via a catheter inserted into the nose or mouth. Can do. As a specific usage method, water for adjusting the concentration of the liquid food or other additional nutrients to be added can be introduced into the packaging bag containing the liquid food from the opening. In addition, after the administration of all the liquid foods is completed, water can be poured into the packaging bag from the opening in order to wash away the liquid food remaining in the catheter. Such a liquid food packaging bag is preferably provided with a spout for connecting the catheter directly or via an infusion set. Furthermore, if the upper end edge of the container body is heat-sealed with or without the sealing member, the opening line of the sealing member can be isolated from the outside, so that it is hygienic. Is preferable.

  In the method for manufacturing a packaging bag of the present invention, at least an opening assist line of the sealing member is formed by laser processing. Both the planned opening line and the auxiliary opening line of the sealing member may be laser processed simultaneously or sequentially. However, as described above, the planned opening line is formed when the sealing member is molded, and the auxiliary opening line is a laser. It is preferable to form by processing. At that time, the laser focus at the time of laser processing is set outside the sealing member. Thus, by setting the laser focus outside the sealing member, the opening assist line can be stably formed in a non-penetrating state with respect to the base material sheet of the sealing member. That is, the present invention takes into account that the laser is concentrated most at its focal point and gradually decreases as it moves away from the focal point, and avoids scanning near the focal point where the energy density becomes extremely high. As shown in FIG. 3, the laser focus at that time is set apart from the side or the upper or lower side of the sealing member. However, FIG. 3 shows the lens of the laser device, the sealing member, the focal point, and the distance between them for the sake of explanation. Actually, since the thickness of the sealing member is several hundred μm, the positional relationship is a positional relationship having a large distance of several tens of times or more. With this configuration, the energy density is moderately suppressed even when the distance between the lens of the laser device and the sealing member is close or separated depending on the position and molding state of the sealing member during laser processing. Since the sealing member can be laser-scanned in the applied state, fluctuations in applied energy can be suppressed to some extent, and moderately large energy can be stably applied. Therefore, after forming the planned opening line on the sealing member, when forming the auxiliary opening line by laser processing, even if the laser scanning intersects the thin part of the planned opening line, the thin part of the planned opening line is more than necessary. It can avoid becoming thin. In this case, it is preferable to set the focal point to the side where the thin portion of the sealing member is formed (the side where the resin is shaved) as shown in FIG. By setting in this way, even if the distance between the lens of the laser device and the sealing member has to be set short, it is unintentionally opened with a laser beam with high energy density due to fluctuations in the distance. It is possible to prevent the thin portion of the planned opening line that intersects the auxiliary line from being heated, and to prevent the thin portion from becoming thinner than necessary.

  As laser processing conditions, the laser frequency can be set in a normal laser oscillator: 1000 to 100,000 Hz, preferably 5000 to 20000 Hz, and the laser scanning speed is 100 to 10,000 mm / s, preferably 500 to 5000 mm / s. Yes, the laser output is usually 5 to 85%, preferably 10 to 30% of the capability of the apparatus.

The type of laser is not particularly limited, but for example, a solid laser using Nd-doped YAG, a semiconductor, etc .; a gas laser using He—Ne, ArF excimer, CO ₂ , Ar ions, etc .; A liquid laser using a solution can be used.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the following examples.
FIG. 1A is a plan view of a packaging bag 1 showing an example of the present invention, and FIG. 1B is a sectional view taken along line XX in FIG. As shown in FIG. 1, the packaging bag 1 includes a container main body 11 having an opening at one end and a sealing member 12 that seals the opening, and an openable / closable spout 13 that communicates the inside and outside of the container. At the bottom. The packaging bag 1 is a container that can quickly and surely dispense contents by being provided with such a spout 13 and can be filled from here if necessary.

  The container main body 11 is constituted by a front film 111 and a back film 112, and has a square edge portion heat-sealed, and has a notch 113 on an upper portion of the heat-sealed side edge. Further, the sealing member 12 is folded inward of the container main body, and faces the opening expected line 122 thinned in a non-penetrating state along the broken line 121 toward the center side (content storage section side) of the container main body. And a resealing means 124 comprising a pair of concave grooves and ridges provided in parallel with the planned opening line 122, facing the upper edge of the container body.

  FIG. 2 is a side view and a plan view of the state in which the sealing member 12 is not folded. As shown in FIG. 2, the sealing member 12 is formed by being thinned in a non-penetrated state intersecting with the planned opening line 122 provided thinned in a non-penetrated state along the length direction. A plurality of opening assist lines 123 and a resealing means 124 including a pair of concave grooves and ridges provided in parallel with the planned opening line 122 are provided.

  Here, the resealing means 124 is molded integrally with the sealing member 12 or fixed on the sealing member 12. Further, both end portions in the length direction of the sealing member 12 are folded so that the resealing means 124 is on the inside, and are heat-sealed and fixed to the front film 111 or the back film 112 on both sides of the container body 11. The The fixing means is not particularly limited, and adhesion using an adhesive or the like can be appropriately employed.

The manufacturing method of the packaging bag 1 of this invention is demonstrated.
First, the front film 111 and the back film 112 were each laminated by using a dry laminating method. Here, each of the front film 111 and the back film 112 was a laminated film of an unstretched polypropylene film (thickness 60 μm), a biaxially stretched nylon film (thickness 15 μm), and a biaxially stretched PET film (thickness 12 μm). Here, the polypropylene film layer becomes a heat seal layer.

  Second, the sealing member 12 illustrated in FIG. 2 was produced. The sealing member 12 is made of a polypropylene sealing sheet 125 (base sheet thickness 380 μm) provided with resealing means 124 for engaging the recessed groove portion and the projecting ridge portion, and a scheduled opening line 122 that is a thin portion. An opening assist line 123 was formed by laser processing. The chuck sheet 125 can be molded by a known method such as extrusion molding or injection molding.

Here, when the sealing member 12 is manufactured, the laser processing conditions for forming the opening assist line 123 in which the thin portion is formed in the non-penetrating state are as follows.
Equipment used: Starscribe Easy (CO ₂ laser oscillator) manufactured by ROFIN-BAASEL
Laser frequency: 10000Hz
Laser scanning speed: 2000 mm / s
Laser power: 15%

  And in the said Example, as shown to FIG. 3 (A), the laser focus 211 at the time of a laser processing was set apart to the upper part side of the thin part of the opening expected line 122. FIG. By doing in this way, the opening assistance line 123 can be reliably formed in a non-penetrating state with respect to the base sheet, and in particular, the crossing portion between the opening opening line 122 and the opening assistance line 123 is also stably non-penetrating. It could be formed in a penetrating state. As a result, the sealing member 12 having a residual sheet thickness (sheet thickness remaining after the thin portion was formed) of the auxiliary opening line 123 close to the thin portion thickness of the planned opening line 122 was obtained.

FIG. 3 shows how the opening assisting line 123 is formed on the chuck sheet 125 by laser processing.
The laser beam 21 may be irradiated from the side facing the expected opening line 122 formed on the surface of the chuck sheet 125 (FIG. 3A) or from the back side (FIG. 3B). good. In both cases, in FIG. 3, the laser focal point 211 is set to a position spaced from the bottom position of the thin-walled groove of the planned opening line 122 to the upper side of the groove. Note that the position of the focal point 211 of the laser light 21 can be changed by positioning the lens 22.

  Third, the container body 11 shown in FIG. 1 was produced. The heat sealing layer faces the sealing member 12 bent along the planned opening line 122 of the sealing member 12 so that the pair of concave grooves and the ridges of the resealing means 124 can be engaged with each other. Between the top film 111 and the back film 112 superimposed on each other, the sealing member 12 is inserted and sandwiched so as to leave a portion where the sealing member 12 does not exist at the top, and the entire periphery is heated. Sealed. Further, the container body 11 is formed by heat-sealing the entire periphery of the surface film 111 and the back film 112 with the spout 13 sandwiched between the surface film 111 and the back film 112 at the bottom of the container body. At the same time, the sealing member 12 and the spout 13 were fixed to the container body 11.

  Finally, notches 113 are provided in the heat seal portions on both sides where the sealing member 12 does not exist at the upper part of the container main body 11 to complete the packaging bag 1 shown in FIG. This packaging bag is suitable for storing medical liquid such as liquid food.

Various methods can be adopted as the method for filling the contents of the packaging bag 1. For example, when sealing the peripheral edges of the front film 111 and the back film 112, heat sealing is performed with the content filling port secured while leaving one side, and the content filling port is filled after filling the content through the content filling port. In the case of a bag with a spout as in this embodiment, after forming the packaging bag 1, the contents are filled and resealed through a spout 13 that can be opened and closed. Also good.
Further, in the packaging bag filled with the contents, the resealing means 124 may or may not be engaged. However, when the contents are liquid such as liquid food, the contents during transportation The resealing means 124 is preferably engaged because the planned opening line 122 of the sealing member 12 may be broken by closing and opening due to the flow of.

  As a method of using the packaging bag 1, first, the packaging bag 1 is opened from a notch 113 provided at a side end portion of the packaging bag 1 filled with the contents. Secondly, when the resealing means 124 is engaged, the engagement is released. Finally, a force is applied locally so as to push a finger into the packaging bag so that a force is applied along the planned opening line 122 provided on the sealing member 12, and a tear along the planned opening line 122. By forming, the sealing member 12 is also opened, and the contents filled in the packaging bag 1 can be taken out of the packaging bag and other articles can be introduced into the packaging bag. The packaging bag 1 is a packaging bag that is easy to form such a tear and is therefore highly practical.

While the present invention has been described based on the embodiments, it can be changed as appropriate without departing from the spirit of the present invention. The shape of the package, the shape of the sealing means, the presence or absence of the spout, the installation location of the spout, etc. are not limited. For example, it is not necessary to stick to the formation of continuous thin-walled portions, and the planned opening line and the opening assist line may be intermittent. Moreover, a printing layer may be provided in a packaging bag, or a spout may be provided in the center part of a lower end edge.
Moreover, when forming the opening line and / or the auxiliary opening line, a method of forming using means other than laser, for example, an N / C machine tool having a sharp blade may be employed.

It is the top view and sectional drawing which show an example of the packaging bag of this invention. It is the side view and top view of a sealing member in the packaging bag of this invention. It is a figure for demonstrating a mode that the opening assistance line by laser processing of the chuck | zipper sheet | seat of this invention is formed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging bag 11 Container main body 12 Sealing member 121 Polyline 122 Opening planned line 123 Opening auxiliary line 124 Resealing means 125 Chuck sheet

Claims (9)

  A packaging bag comprising: a container body having an opening at one end; and a sealing member that is joined into the container body and is folded inward of the container body through a broken line to seal the opening. The sealing member is a thin opening line formed along a broken line of the sealing member, and one or a plurality of opening assist lines formed thinly so as to intersect with the opening planned line, A packaging bag comprising: resealing means capable of opening the opening formed by opening the planned opening line so as to be freely closed.   The sealing member has a base formed by folding a square sheet body into a V-shaped cross section, and is heat-sealed and fixed to the innermost layer of the container body only in the vicinity of both side edges of the base. Item 1. A packaging bag according to item 1.   The packaging bag according to claim 1 or 2, wherein the resealing means is a chuck seal in which the groove portion and the ridge portion are engaged.   The packaging bag according to any one of claims 1 to 3, wherein the opening of the container body is heat-sealed without passing through the sealing member.   The packaging bag according to any one of claims 1 to 4, wherein the opening is for introducing an article into the packaging bag.   The packaging bag according to claim 1, wherein the packaging bag has a spout.   The packaging bag according to any one of claims 1 to 6, wherein the packaging bag contains medical liquid.   A container main body having an opening at one end; and a sealing member that is joined in the container main body and is folded inward of the container main body via a broken line to seal the opening. Is a thinned opening line formed along a broken line of the sealing member, one or a plurality of opening assist lines formed thinly so as to intersect with the planned opening line, and the unscheduled opening line A method for manufacturing a packaging bag comprising: a resealing means capable of closably opening an opening formed by opening an opening, wherein at least the opening auxiliary line is formed by laser processing Bag manufacturing method. 9. The method for manufacturing a packaging bag according to claim 8, wherein a laser focus at the time of laser processing is set outside the sealing member.

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