JP2019167145A - Packaging bag and its manufacturing method - Google Patents

Abstract

To provide a packaging bag which, in spite of being a packaging bag using a hard-to-break laminate, can be double folded, and whose contents can be reliably squeezed out.SOLUTION: A packaging bag 1 is made of sealant layers which respectively have a front laminate 11 and a back laminate 12 each having a base layer 13 and a sealant layer 15 and face each other and whose rims are heat-sealed. The packaging bag is characterized as such that an opening position 6 of the packaging bag is planned to be in the upper horizontal direction of the packaging bag, along the longitudinal center line of the packaging bag, on the sealant layer of either one or both of the front laminate and the back laminate, a cut-line 8 is provided which penetrates or does not penetrate the sealant layers.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag, and more particularly to a packaging bag having a structure that can be easily taken out when a content containing a solid content or a liquid having a high viscosity is taken out, and a manufacturing method thereof.

  A packaging bag made of a synthetic resin film with a heat sealable sealant layer bonded to each other with the sealant layers facing each other and heat-sealed at the periphery is a container for storing various contents. Widely used.

  If the contents are relatively low in viscosity such as soy sauce or vinegar, there is no need to squeeze them out, but if the contents are high in viscosity such as mayonnaise or ketchup, It is necessary to squeeze out from.

  In particular, if the contents are generally high in viscosity, such as curry or side dish, and contain solids, some squeezing operation is indispensable. In a curry retort pouch, etc., it is customary to squeeze the bag by folding it vertically and then squeezing it. However, especially for retort food packaging bags, thick and firm laminates with laminated aluminum foil are used to increase barrier properties, so it is often difficult to fold and does not fold when folded. . For this reason, the fold line is bent when squeezed out, and sometimes the hand slips and the contents are even scattered.

  The easy squeezable pouch described in Patent Document 1 is one solution to such a problem, and is provided with a take-out seal portion in which a pour-out portion is formed on the upper surface or rear central portion of the pouch. The width is about 1/3 of the width of the bag.

  The pouch described in Patent Document 1 is one in which the takeout seal portion is cut and opened, and then the vertically long pouch is folded in half in the horizontal direction and squeezed out. The width of the squeezed bag is the width of the original bag itself. Therefore, the squeezing effect is small. In addition, since the structure is complicated, there is a problem that the manufacturing cost is high.

  Similarly, the one-touch take-out packaging bag described in Patent Document 2 is a packaging bag that can easily pour out retort food and the like from the bag. In this packaging bag, an extruding roll wound with a cut tape is attached to the top of the bag, and the contents are squeezed while the bag is wound around the extruding roll by pulling the cut tape.

  Although the packaging bag described in Patent Document 2 can be expected to have a squeezing effect, it requires a cost of necessary parts and a processing cost for attaching the packaging bag, so it must be quite expensive as a packaging bag.

  The packaging bag described in Patent Document 3 has a wide place to be grasped by hand when opening the packaging bag from the end, and can be easily opened, the opening is small, the amount of the contents can be adjusted, and the contents can be taken out. Is a packaging bag that can be taken out without splashing and can be folded in two to completely squeeze out the contents.

In the packaging bag described in Patent Document 3, the packaging bag described in Patent Document 1 opens about 1/3 of the central portion of the bag, whereas the right or left 1/3 of the bag. Will be opened. For this reason, it is possible to squeeze the product into two vertically, and although the ease of squeezing has been improved, the fundamental problem that it is difficult to fold the packaging bag in the vertical direction has not been solved.

JP 2001-206387 A JP 2003-26200 A JP 2006-117319 A

  The problem to be solved by the present invention is to propose a packaging bag that can be easily folded into two even if it is a packaging bag using a strong laminate, and the contents can be squeezed reliably. .

  As a means for solving the above problems, the invention according to claim 1 is such that the sealant layers of the front surface laminate and the back surface laminate each having a base material layer and a sealant layer are opposed to each other, and the periphery is heat sealed. An opening position of the packaging bag is planned in the upper horizontal direction of the packaging bag, and either the front surface laminate or the back surface laminate along the longitudinal center line of the packaging bag or Both of the sealant layers are provided with cut lines that pass through or do not pass through the sealant layer.

  In the packaging bag according to the present invention, since the cut line is provided in the sealant layer along the longitudinal center line of the packaging bag, the packaging bag can be easily folded in two vertically and the contents can be easily squeezed out.

  The invention according to claim 2 is the packaging bag according to claim 1, further comprising a gas barrier layer that suppresses permeation of water vapor and oxygen between the base material layer and the sealant layer.

  The invention according to claim 3 is the packaging bag according to claim 1 or 2, wherein the cut line is processed intermittently.

  In addition, the invention according to claim 4 is the packaging bag according to any one of claims 1 to 3, wherein the cut line is composed of a plurality of parallel lines.

  The invention according to claim 5 is a method for manufacturing a packaging bag, comprising the following steps. That is, the process of continuously processing the number of cut lines corresponding to the number of cuts in the width direction at a predetermined position of the film to be the sealant layer, and alternately assigning the front and back patterns of the packaging bag to the film to be the base layer The step of applying printing, the step of laminating the film to be the base material layer and the film to be the sealant layer, and continuously laminating the laminated body at the center to form two laminates The process is a process in which the sealant layers of the two laminates are opposed to each other and heat sealed at predetermined positions in the vertical direction and the horizontal direction, and then cut into a packaging bag.

  In the packaging bag according to the present invention, a cut line that penetrates or does not penetrate the sealant layer is provided in one or both of the surface laminate and the back laminate along the longitudinal center line of the packaging bag. Since it is provided, after opening the packaging bag, the operation of folding the packaging bag in two along the longitudinal center line can be performed very smoothly.

For this reason, when a highly viscous content or a content containing a solid content such as curry is stored, the operation of squeezing the content in two can be performed very naturally and without failure. It was.

  When the gas barrier layer that suppresses the permeation of water vapor and oxygen is provided between the base material layer and the sealant layer as in the invention described in claim 2, the packaging body using this packaging bag can be stored for a long period of time. It becomes.

  When the cut line is processed intermittently as in the invention described in claim 3, it is possible to prevent the laminated body from being broken when it is folded in half. . Conversely, as in the invention described in claim 4, when the cut line is composed of a plurality of parallel lines, even a laminate that is difficult to break can be easily folded.

  According to the invention described in claim 5, it is possible to continuously form the cut lines, and it is possible to efficiently produce the packaging bag according to the present invention with a predetermined number of rows. In addition, because the front-side and back-side patterns are alternately assigned, even if there is a large difference in the ink amount between the front-side and back-side patterns, the winding is biased and cannot be wound well. Will not occur.

FIG. 1 is an explanatory plan view schematically showing one embodiment of a packaging bag according to the present invention. FIG. 2 is a cross-sectional explanatory view schematically showing the AA ′ cross section of FIG. 1. FIG. 3 is a perspective explanatory view schematically showing a state in which the packaging bag according to the present invention is opened and folded in half. FIG. 4 is a cross-sectional explanatory view schematically showing an example of the layer structure of the laminate used in the packaging bag according to the present invention. FIG. 5 is an explanatory plan view schematically showing another embodiment of the packaging bag according to the present invention, and shows an example of two lines with parallel cut lines. FIG. 6 is a cross-sectional explanatory view schematically showing the BB ′ cross section of FIG. 5. FIG. 7 is an explanatory plan view schematically showing another embodiment of the packaging bag according to the present invention, and shows an example in which cut lines are processed intermittently. FIG. 8 is an explanatory perspective view showing a case where three sets of cut lines and three patterns of the front and back patterns of the packaging bag are alternately allocated to the wide laminate in the manufacturing method of the packaging bag according to the present invention. is there.

  Hereinafter, a packaging bag and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory plan view schematically showing one embodiment of a packaging bag 1 according to the present invention. FIG. 2 is a cross-sectional explanatory view schematically showing the AA ′ cross section of FIG. 1. FIG. 4 is a cross-sectional explanatory view schematically showing an example of the layer structure of the laminate 10 used in the packaging bag 1 according to the present invention.

  In the packaging bag 1 according to the present invention, the surface laminate 11 having at least the base material layer 13 and the sealant layer 15 and the sealant layers of the back surface laminate 12 having at least the base material layer 13 and the sealant layer 15 are opposed to each other. And a packaging bag formed by heat-sealing the periphery. An opening position 6 of the packaging bag is scheduled in the upper horizontal direction of the packaging bag, and one or both of the sealant layers of the front surface laminate 11 and the back surface laminate 12 along the longitudinal center line of the packaging bag 1. 15 is provided with a cut line 8 that passes through or does not pass through the sealant layer 15.

  In the example shown in FIGS. 1 and 2, a cut line 8 that does not penetrate the sealant layer is provided in the sealant layer 15 of the front surface laminate 11, and a cut line is provided in the sealant layer of the back surface laminate 12. Absent. In FIG. 1, the cut line 8 is not visible from the surface of the packaging bag, and is represented by a broken line. Moreover, since the opening position 6 does not physically exist, it is expressed by a dotted line.

  The score line 8 can be provided on one or both of the front surface laminate 11 and the back surface laminate 12. Further, the depth of the cut line 8 may pass through the sealant layer 15.

  In the example shown in FIG. 1, a top seal portion 5, side seal portions 3 and 4, and a bottom seal portion 2 are formed as peripheral seal portions. Usually, at the stage of the packaging bag, the top seal portion or the bottom seal portion is supplied to the filling factory in an unsealed state, and is heat-sealed after filling the contents.

  In the example shown in FIG. 1, an opening notch 7 serving as an opening start portion is formed on both side seal portions at the opening position 6. The opening notch is not limited to the U-shape as shown in the figure, but is optional such as a V-shape or an I-shape.

  FIG. 3 is a perspective explanatory view schematically showing a state where the packaging bag 1 shown in FIGS. 1 and 2 is opened and folded in half. Thus, the packaging bag 1 according to the present invention is easily folded in two because the cut line 8 is provided in the sealant layer 15 of the surface laminate 11 along the longitudinal center line. There is no slippage. For this reason, the operation of squeezing out the contents is stable and can be squeezed out safely.

  FIG. 5 is an explanatory plan view schematically showing another embodiment of the packaging bag 1 according to the present invention, and shows an example in which the cut line 8 is composed of two parallel lines. FIG. 6 is an explanatory cross-sectional view schematically showing the BB ′ cross section of FIG. Thus, the cut line 8 can be composed of a plurality of parallel lines.

  By doing in this way, even if it is a thick laminated body, it can be easily folded. On the contrary, in the case where the laminate is not so thick and not stiff, there may be a case where the laminated body is not a continuous line but is processed intermittently as in the example shown in FIG. The number, shape, depth, and the like of the cut lines 8 may be optimally set according to the properties of the laminate 10.

  As a method of forming the score line 8 in the sealant layer of the laminate, a method using a blade or a method using a laser processing machine may be used. In any case, it is necessary to form the cut line 8 before the peripheral edge is heat-sealed in the bag making machine.

  As the base material layer 13 constituting the laminate, various synthetic resin films can be used. Specifically, polyester resins such as polypropylene resin (PP), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), polyethylene naphthalate resin (PEN), and polyamide resins such as nylon-6 and nylon-66. It is a single film such as resin, polycarbonate resin (PC), or a combination thereof.

A gas barrier layer 14 that suppresses permeation of water vapor and oxygen can be provided between the base material layer 13 and the sealant layer 15. Examples of the gas barrier layer include: a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier polyethylene terephthalate (PET) film and the like, and a PET film and other metals such as aluminum. A metal vapor-deposited film, an inorganic oxide vapor-deposited film obtained by depositing an inorganic oxide such as aluminum oxide or silicon oxide on a PET film, a polyvinylidene chloride coating, a film containing a water-soluble resin and an inorganic layered compound, A gas barrier coating layer such as a resin layer made of a film obtained by reacting a metal alkoxide or a hydrolyzate thereof and an isocyanate compound, or a metal foil such as an aluminum foil can be used.

  As the sealant layer, a polyolefin-based resin is generally used, and specifically, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a linear low density polyethylene resin (LLDPE), ethylene-acetic acid. Ethylene resins such as vinyl copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blend resin of polyethylene and polybutene, homopolypropylene resin (PP), propylene-ethylene Polypropylene resins such as random copolymers, propylene-ethylene block copolymers, and propylene-α olefin copolymers can be used.

  As a method for bonding these layers, a dry laminating method using an adhesive is generally used, but an extrusion laminating method using an adhesive resin may be used.

  When an aluminum foil is used as the gas barrier layer 14, the cut lines 8 can be stably formed by irradiating laser light from the sealant layer side of the laminate. The cut line 8 may be formed on a single film as a sealant layer, after the sealant layer and the gas barrier layer are bonded, or further bonded to the base material layer to complete the laminate. It may be at the stage.

  FIG. 8 is an explanatory perspective view showing a state in which three sets of the three cut lines 8 and the front and back patterns of the packaging bag are alternately assigned to the wide laminate in the manufacturing method of the packaging bag according to the present invention. It is. The method for producing the packaging bag 1 according to the present invention includes the following steps.

  That is, the process of continuously processing the number of cut lines corresponding to the number of cuts in the width direction at a predetermined position of the film to be the sealant layer, and alternately assigning the front and back patterns of the packaging bag to the film to be the base layer The step of applying printing, the step of laminating the film to be the base material layer and the film to be the sealant layer, and continuously laminating the laminated body at the center to form two laminates The process is a process in which the sealant layers of the two laminates are opposed to each other and heat sealed at predetermined positions in the vertical direction and the horizontal direction, and then cut into a packaging bag.

  First, it is a step of continuously processing the number of cut lines 8 corresponding to the number of cuts in the width direction at a predetermined position of the film to be the sealant layer, but in this example, the number of cuts in the width direction is 3, Three cut lines 8 are processed. In this example, the cut line 8 is formed at the center line of the imposition which becomes the surface laminate among the respective impositions, so as shown in the figure, about 1/12 and 5/12 of the full width from the front. , 9/12 is formed at the position of 9/12. Actually, this is not exactly the case because margins are required at both ends of the film. It is just an idea.

Next, the film which becomes a base material layer is printed by alternately assigning three sets of the front and back patterns of the packaging bag. The meaning of alternately assigning the front and back patterns in this way is that the thickness of the ink is averaged in the width direction even when the pattern area differs greatly between the front and back patterns. This is because when the front and back sides are assigned, the balance of the windings is lost on the left and right sides, and it may not be wound well.

  Next, the substrate film and the sealant film on which printing has been completed, and in some cases, a film serving as a gas barrier layer are bonded to form a laminate. The laminate is cut along the center cutting line 9 to form two windings.

  Unwinding is performed so that the two sealant layers of the winding are opposed to each other, and necessary heat sealing is performed, and the individual packaging bags are completed by cutting. According to this method, the packaging bag is limited to having a vertical surface, but there is an advantage that the cutting line can be processed extremely efficiently. Hereinafter, more specific description will be given based on examples.

<Example 1>
As a base material layer, a PET film having a thickness of 12 μm was used, and printing was performed so that the front surface pattern and the back surface pattern were alternately mounted on three sides as shown in FIG. As the sealant layer, an unstretched PP film (CPP) having a thickness of 60 μm was used, and three cut lines were processed at positions as shown in FIG. 8 by a laser processing machine. The processing line width was 350 to 400 μm, and the processing depth was about 30 μm. An aluminum foil having a thickness of 7 μm was prepared as a gas barrier layer.

  Using a dry laminating machine, three layers of PET film, aluminum foil and CPP were bonded together and cut along the cutting line at the center to form two windings.

  In the bag making machine, the two windings are set so that the sealant layers face each other, the side seal part and the top seal part are sealed, and cut into a packaging bag as shown in FIG. .

  When the obtained packaging bag was filled with an element of cooking containing solids, the operation of extracting the contents by extracting the contents by folding the packaging bag in half vertically could be performed stably.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Bottom seal part 3, 4 ... Side seal part 5 ... Top seal part 6 ... Opening position 7 ... Opening notch 8 ... Cut line 9 ... Cutting line 10 ... Laminated body 11 ... Front surface laminated body 12 ... Back side laminated body 13 ... Base material layer 14 ... Gas barrier layer 15 ... Sealant layer

Claims (5)

  Each of the front surface laminate and the back surface laminate, each having a base material layer and a sealant layer, facing each other and heat-sealing the periphery, the opening position of the packaging bag being in the upper horizontal direction of the packaging bag A cut line that passes through or does not pass through the sealant layer is provided in one or both of the surface laminate and the back laminate along the longitudinal center line of the packaging bag. A packaging bag characterized by being made.   The packaging bag according to claim 1, further comprising a gas barrier layer that suppresses permeation of water vapor and oxygen between the base material layer and the sealant layer.   The packaging bag according to claim 1 or 2, wherein the cut line is processed intermittently.   The packaging bag according to any one of claims 1 to 3, wherein the cut line is composed of a plurality of parallel lines. The manufacturing method of the packaging bag characterized by including the following processes.
A process in which the number of cut lines corresponding to the number of cuts in the width direction are continuously processed at a predetermined position of the film that becomes the sealant layer, and the printing that alternately assigns the front and back patterns of the packaging bag to the film that becomes the base layer A step of applying a film, a step of laminating a film to be a base material layer and a film to be a sealant layer, a step of continuously cutting the laminated body at the center to form two laminates, The process of making it a packaging bag, after making the sealant layers of two laminated bodies face each other and heat-sealing the predetermined position of a vertical direction and a horizontal direction.

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