JP2015047809A - Method for producing self-standing packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method for a self-standing packaging bag having high productivity, resistant to impact at dropping and capable of reducing breakage of the packaging bag.SOLUTION: A production method for a self-standing packaging bag comprises: inserting a bottom sheet into lower parts of trunk part sheets which are disposed in a facing state while folding and sealing it to the trunk part sheets to form a bottom seal part; sealing both sides of the trunk part sheet to form a side seal part; and spreading the bottom sheet to enable the bag to self-stand. The bottom seal part comprises a first bottom seal part, and a second bottom seal part extending from the side seal part in an oblique direction to reach the first bottom seal part. The production method comprises a first sealing process 23 of sealing a first bottom seal part 5 and a second sealing process 26 of simultaneously sealing a side seal part 7 and a second bottom seal part 6. The second sealing process 26 seals the side seal part 7 and the second bottom seal part 6 by an integrated seal bar 24.

Description

  The present invention relates to a method for manufacturing a self-supporting packaging bag.

  Conventionally, self-supporting packaging bags have been used in a wide range of fields such as shampoos, rinses and other refills, beverages such as coffee and milk beverages, alcohol, wine, soups, seasonings, and confectionery.

  The self-supporting packaging bag is usually composed of a trunk sheet and a bottom sheet made of a flexible sheet. For example, as shown in FIG. 7, the bottom sheet 3 is inserted into the lower part of the body sheet 2 while being folded and sealed to seal the bottom seal part 4, and then both sides of the body sheet are sealed to form the side seal part. 7 is formed. The bottom seal portion 4 is formed to be sealed in a boat shape. The space formed by the body sheet and the bottom sheet is filled with the contents, and then the top part of the self-supporting packaging bag is heat-bonded and sealed. The bottom sheet 3 is expanded at the time of filling to become a self-supporting packaging bag.

  Self-supporting packaging bags are excellent in compressibility and flexibility, but in recent years there has been a tendency to increase the volume of contents, and bag breakage at the time of dropping has become a problem. When the capacity of the contents is increased, the weight increases, and when the packaging bag falls, there is a problem that the packaging bag is broken by the impact at the time of dropping, and the contents are scattered around and contaminated.

  In the drop impact in the vertical direction of the self-supporting packaging bag, at the time of dropping, the bottom sheet is pulled downward in the vertical direction, and the impact is most at the intersection 9 (shown in FIG. 7) where the bottom seal portion and the side seal portion are sealed and intersected. In addition, the film tends to break from this portion. For example, if even one of the position of the bottom sheet and the position of the bottom seal part and the side seal part is displaced, a step is generated at the intersection part. If there is this step, the film breaks from this portion. When sealing by the normal seal bar method, there are the position of the bottom sheet, the position of the bottom seal part, and the position of the side seal part as the elements for managing the intersection, and these three points must be managed.

  If the above three points do not match, there is a risk that a step will occur at the intersection where the bottom seal and side seal are sealed, so the point will be removed later by applying a point seal to the intersection. I am doing so.

  In order to improve such problems, there is a proposal to reinforce the intersection by changing the seal shape of the bottom seal part, forming an extension part at the top of the inclined seal part in the boat-shaped bottom seal type (Patent Document 1).

  However, it is difficult to completely prevent the film breakage at the intersection due to the impact at the time of dropping, and a fundamental solution has not been reached.

  Further, it has been studied to improve the tensile strength and the impact resistance in the film configuration. For example, measures such as a two-layer configuration (stretched polyamide film / linear low-density polyethylene film) to a three-layer configuration (stretched polyamide film / intermediate film / linear low-density polyethylene film) are taken. However, increasing the number of layers leads to an increase in production cost, and in order to reduce the cost, a film having a layer structure is being made thinner, but the drop impact resistance becomes severe.

  In addition, there is a proposal in which an air filling portion that communicates with the seal portion is formed in each of the bottom seal portion and the both side seal portions in order to buffer an impact at the time of dropping (Patent Document 2).

  However, since the air of the air filling part of the bottom seal part moves to the side seal part side at the time of dropping, there is a problem that the force for absorbing the impact at the time of dropping is lowered.

  Therefore, there is a need for a self-supporting packaging bag that is resistant to impacts when dropped and can reduce breakage of the packaging bag.

JP 2001-206384 A Japanese Patent No. 4736364

  In view of the above-mentioned problems of the background art, the present invention is to provide a manufacturing method of a self-supporting packaging bag that has productivity, is resistant to impact at the time of dropping, and can reduce breakage of the packaging bag. .

  In order to solve the above problems, the inventors have intensively studied and completed the present invention.

The invention according to claim 1 of the present invention includes a bottom seal portion that is inserted into a lower portion of a body sheet that is disposed opposite to the bottom sheet while folding the bottom sheet, and integrates the body sheet and the bottom sheet at the bottom, In the method of manufacturing a self-supporting packaging bag in which the bottom sheet is expanded and formed to be self-supporting by forming a side seal part that integrates the part sheets on both sides, the bottom seal part is in the horizontal direction. A method for producing a self-supporting packaging bag comprising: a linear first bottom seal portion that extends; and a second bottom seal portion that extends obliquely from the side seal portion and reaches the first bottom seal portion,
Comprising a first sealing step for sealing the first bottom seal portion, and a second sealing step for simultaneously sealing the side seal portion and the second bottom seal portion,
Said 2nd sealing process is a manufacturing method of the self-supporting packaging bag characterized by sealing the said side seal part and a 2nd bottom seal part with the integrated integral seal bar.

  The invention according to claim 2 of the present invention is characterized in that the second bottom seal portion is formed by being bent inward with respect to the width direction of the packaging bag. It is a manufacturing method.

  In the self-supporting packaging bag manufacturing method of the present invention, the bottom seal portion is composed of a first bottom seal portion and a second bottom seal portion, and the side seal portion and the second bottom seal portion are integrated into an integrated seal bar. As a result of the sealing, the step does not occur at the intersection where the second bottom seal portion and the side sheet portion are sealed and crossed, so that it is strong against impact at the time of dropping, and the breakage of the packaging bag can be reduced.

  According to the present invention, the bottom seal portion is composed of the first bottom seal portion and the second bottom seal portion, and the side seal portion and the second bottom seal portion are sealed by the integrated integral seal bar. As a result, no step is generated at the intersection where the second bottom seal part and the side seal part are sealed and crossed, so that it is strong against impact at the time of dropping, and the breakage of the packaging bag can be reduced. There is no point seal at the intersection.

  Moreover, the side seal part and the second bottom seal part are sealed with an integrated integrated seal bar, so that the misalignment of the intersection can be managed only by managing the position of the bottom seat and the position of the integrated seal bar. Therefore, it is easy to manage the deviation, and it is possible to stably manufacture a product having no step at the intersection. Even when dropped, it is possible to reduce breakage of the packaging bag.

  In addition, the second bottom seal portion is formed by being bent inward with respect to the width direction of the packaging bag, so that the shape of the bottom seal portion can be formed into a boat shape and when the contents are filled. In addition, the bottom sheet can be easily expanded, and stable independence can be imparted.

  In the manufacturing method of the present invention, it is only necessary to manage the position of the bottom sheet and the position of the integrated seal bar in order to manage the deviation of the intersection part. it can.

It is explanatory drawing which shows an example of the manufacturing method of the self-supporting packaging bag of this invention. It is explanatory drawing which shows an example of the manufacturing method with a bag making machine. It is explanatory drawing which forms the 1st bottom seal part in a bag making machine. It is explanatory drawing which forms the communication seal | sticker part in a bag making machine. It is explanatory drawing of the self-supporting packaging bag with a bag making machine. It is explanatory drawing which shows an example of the laminated constitution of a trunk | drum part sheet | seat and a bottom part sheet | seat. It is explanatory drawing which shows an example of the conventional self-supporting packaging bag.

  Below, the form for implementing this invention is demonstrated.

  Drawing 1 is an explanatory view showing an example of the manufacturing method of the self-supporting packaging bag of the present invention. As shown in FIG. 1A, the self-supporting packaging bag 31 is composed of two body sheets 2, 2 and a bottom sheet 3. The trunk portion sheet 2 and the bottom portion sheet 3 are flexible sheets. A state in which the bottom sheet 3 is inserted between the lower part of the body sheet 2 while being folded is shown. Arrow A indicates the insertion direction.

  1-2, the bottom sheet 3 is inserted into the lower part of the body sheets 2 and 2, the bottom sheet 3 and the body sheet 2 are sealed, and the first bottom seal part 5 is formed in a straight line extending in the horizontal direction. An example is shown.

  FIG. 1-3 shows an example in which, after the first bottom seal portion 5 is formed, the side seal portion 7 and the second bottom seal portion 6 are sealed using the integrated seal bar, and the communication seal portion 8 is formed. Yes. By forming the communication seal portion 8, it is possible to obtain one having no step at the intersection portion 9 where the second bottom seal portion and the side seal portion are sealed and intersected. Further, since the second bottom seal 6 is formed to be bent inward with respect to the width direction of the packaging bag, the bottom seal portion 4 can be formed in a boat shape.

  Drawing 2 is an explanatory view showing an example of the manufacturing method with a bag making machine. This bag making line shows a two-line line of self-supporting packaging bags. In continuous motion, the two front and back body sheets 2, 2 are sent out from the right side, the bottom sheet 3 is sent out while being folded, and the bottom sheet 3 is inserted between the two front and back body sheets 2, 2. Overlap with the nip roll 27. Switching from continuous motion to intermittent motion via a dancer roll (not shown in the figure), the process proceeds to the first sealing step 23. In addition, with respect to the flow direction B of the trunk sheet and the bottom sheet, the right row is indicated by a symbol L and the left row is indicated by a symbol M.

  First, the bottom sheet 3 and the trunk sheet 2 are sealed in order to form the flow direction of the trunk sheet 2, that is, the first bottom seal part 5. There is a first bottom seal bar 21 that can move up and down on the two front and back body sheets 2, 2, and this seal bar 21 applies heat to the film. Specifically, the seal bar 21 is lowered and heated and pressurized to seal the body sheet and the bottom sheet that have been advanced by the intermittent motion, and then the seal bar 21 is moved up to form the body part. The seat and the bottom seat travel in intermittent motion. Depending on conditions, it may be sealed several times.

  Then, it is cooled through a cooling unit. There is a first bottom seal portion cooling bar 22 that can move up and down, and the cooling bar 22 takes heat of the film. Thereafter, the cooling bar 22 rises, and the trunk sheet and the bottom sheet advance in an intermittent motion. Normally, water is circulated through the cooling bar, and the water temperature is kept constant. Depending on conditions, cooling may be performed several times. In this way, the first bottom seal portion is formed in the line direction.

  Next, the trunk sheet is advanced to the second sealing step 26. Sealing is performed in the vertical direction with respect to the line direction of the front and back body sheet. On the two front and back body sheets, there is an integrated seal bar 24 that can move up and down, and this seal bar applies heat to the film. Specifically, the seal bar 24 is lowered and heated and pressurized by the barrel sheet and the bottom sheet that have been advanced by the intermittent motion to be sealed, and then the seal bar 24 is raised and the trunk part The seat and the bottom seat travel in intermittent motion. Sealing is performed by the seal bar 24 to form a communication seal portion. The shape of the integrated seal bar 24 is formed by a side seal portion and a second bottom seal portion extended from the side seal portion, and the second bottom seal portion is bent inward with respect to the width direction of the packaging bag. Yes. In this case, sealing may be performed several times depending on conditions.

  Then, it is cooled through a cooling unit. There is a communication seal part cooling bar 25 that can move up and down, and this cooling unit 25 takes the heat of the film. Thereafter, the cooling bar 25 rises, and the trunk sheet and the bottom sheet advance in an intermittent motion. Normally, water is circulated through the cooling bar, and the water temperature is kept constant. Depending on conditions, cooling may be performed several times. A first bottom seal portion is formed in the line direction.

  The slit blade 29 is arranged in the line direction with respect to the flow direction, and the first bottom seal portion is slit so as to have a predetermined seal width. A slit blade 29 is also arranged at the center of the body sheet, and is slit so as to have a predetermined bag length.

  Finally, the communication seal portion formed in the vertical direction is cut (cut) 30 so as to have a predetermined bag width and shape, whereby a self-supporting packaging bag 31 having a boat-shaped bottom seal portion can be manufactured. It is an example of the bag making process in a bag making machine.

  In particular, by managing the position of the bottom sheet and the position of the communication seal part, there is no step at the intersection where the second bottom seal part and the trunk seal part are sealed and intersect, and it is self-supporting that is strong against impacts when dropped A wrapping bag can be made.

  FIG. 3 is an explanatory view for forming a first bottom seal portion in the bag making machine. The trunk part sheet and the bottom part sheet are advanced in the left direction by intermittent motion. With respect to the flow direction B of the body part sheet and the bottom part sheet, the symbol L indicates the right row, the symbol M indicates the left row, and indicates two-row taking. The bottom sheet 3 folded and inserted into the body sheet 2 is sealed with a first bottom seal bar, cooled, and an example in which the first bottom seal part 5 is formed in a straight line is shown. The first bottom seal portion is formed at both ends of the trunk sheet. In particular, the position management of the bottom sheet is necessary in order to prevent a step from occurring at the intersection with the communication seal part to be processed later.

FIG. 4 is an explanatory view for forming a communication seal portion in the bag making machine. The trunk part sheet and the bottom part sheet are advanced in the left direction by intermittent motion. The communication seal part 8 is formed in the vertical direction with respect to the flow direction B of the body part sheet and the bottom part sheet. The communication seal 8 is formed by being sealed with an integrated seal bar. The communication seal portion seals in a Y shape as shown in FIG. 4 in order to form a bag adjacent to the communication seal portion. Moreover, in order to form in two lines, the state which seals in the shape where two Y character was connected mutually reversely is shown. In particular, the position management of the communication seal part is necessary to prevent a step from occurring at the intersection part.

  In the case where the communication seal portion is formed in the vertical direction at a predetermined position, the slit mechanism 29 is disposed in order to form a predetermined size by intermittent movement. For example, the width of the predetermined seal portion, the height of the packaging bag Slit the ears of the film to make it. Further, for the purpose of taking two lines, a slit mechanism 29 is also arranged at the center in the flow direction of the trunk sheet, and is slit so as to have a predetermined bag height (bag length). As the slit mechanism, a metal blade or laser processing is possible.

  Finally, in order to obtain a predetermined bag width and a predetermined shape, the sheet is cut by a cutting mechanism 30 to have a predetermined shape and a seal width, and a self-supporting packaging bag is created. As the cutting mechanism, Thomson punching using a metal blade or press punching with a metal mold is possible. FIG. 5 shows the self-supporting packaging bag after cutting. The second bottom seal portion 5 and the side seal portion 7 are sealed by an integrated seal bar to form the communication seal portion 8, so that there is no step at the intersection 9 where the bottom seal portion and the side seal portion are sealed and intersected. Is formed.

  Furthermore, the form for implementing this invention is demonstrated in detail.

  FIG. 6 is an explanatory diagram illustrating an example of a layer configuration of a trunk sheet and a bottom sheet. The trunk | drum sheet | seat 2 and the bottom part sheet | seat 3 consist of the laminated sheet 40 which has flexibility. As shown in FIG. 6A, in the laminated sheet 40, the base film layer 41 and the sealant layer 43 are laminated via the adhesive layer 42. The laminated sheet 40 has a layer configuration of base film layer 41 / adhesive layer 42 / sealant layer 43.

  As the base film layer 41, a heat-resistant plastic film can be used. For example, polyester films such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyolefin films such as polyethylene (PE) and polypropylene (PP), polyamide films (PA), polystyrene films (PS) ), Polycarbonate film (PC), polyacrylonitrile film (PAN), polyimide film (PI), polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), and the like. The support is not particularly limited as long as it has mechanical strength and dimensional stability. A biaxially stretched film is particularly preferable. The thickness of the base film is preferably in the range of 10 to 50 μm and more preferably in the range of 10 to 30 μm in consideration of workability.

  As the sealant layer 43, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-methacrylic acid copolymer (EMAA), ethylene- A film made of a polyolefin resin such as ethyl acrylate copolymer (EAA), ethylene-vinyl acetate copolymer (EVA), ionomer, polypropylene (PP) can be used. These resins can be used by forming a film with an extruder. It can be used in a single layer or multiple layers using the above resin. The film thickness is preferably in the range of 10 to 100 μm, more preferably in the range of 15 to 70 μm.

As the adhesive layer 42, an adhesive for dry lamination can be used. For example, a two-component curable urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, an epoxy adhesive, and the like can be used. . As a bonding method, a dry lamination method is possible.

  Moreover, the base film layer 41 can be appropriately provided with a printing layer as necessary. The printed layer is made of a solvent, ink made by adding urethane, acrylic, nitrocellulose, rubber and other binder resins, and various pigments, extenders, plasticizers, desiccants, stabilizers, etc. Layer. Characters, designs, etc. can be formed by this print layer. As the printing method, for example, known printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, and ink jet printing can be used. Moreover, the adhesiveness of a printing layer can be improved by performing the corona treatment or the ozone treatment as the pre-treatment on the surface of the base film layer in advance. Usually, a printing layer is provided on the inner surface of the base film layer.

  Further, if it is necessary to improve various physical properties of the laminated sheet 40, the intermediate layer 44 can be provided on the laminated sheet. For example, the oxygen gas barrier and the water vapor barrier can be improved, and the lamination sheet can be laminated as necessary, such as to improve the rigidity, drop strength, puncture strength, and the like. As shown in FIG. 6B, the laminated sheet 40 has a layer configuration of base film layer 41 / adhesive layer 42 / intermediate layer 44 / adhesive layer 42 / sealant layer 43 as the layer configuration.

  As the intermediate layer 44, for example, a stretched polyamide resin film, a polyethylene terephthalate film, or the like can be used to improve the drop strength or the piercing strength, and an aluminum gas barrier or a water vapor barrier can be improved using aluminum. A foil, an aluminum-deposited polyethylene terephthalate film, an inorganic oxide-deposited polyethylene terephthalate film, or the like can be used. Moreover, in order to laminate | stack an intermediate | middle layer, it can bond together by the dry lamination method through the contact bonding layer 22. FIG.

  Examples of the inorganic oxide include metal oxides such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, ruthenium dioxide, and yttrium oxide. Can be used. Of these, silicon oxide, aluminum oxide, magnesium oxide and the like are preferable from the viewpoint of productivity and price.

  Hereinafter, specific examples of the present invention will be described.

  As a base film layer, a polyethylene terephthalate film 12 μm was used, and gravure printing was performed using a gravure ink using a urethane resin as a binder.

  Next, using a two-component curable urethane adhesive, 70 μm of a linear low density polyethylene film (LLDPE) was bonded to the printed surface by a dry laminating method to form a laminated sheet. As the laminated sheet, a laminated sheet of polyethylene terephthalate film (PET) 12 μm / printing layer / adhesive layer / linear low density polyethylene film (LLDPE) 70 μm was formed.

  Next, in order to form a self-supporting packaging bag, the laminated sheet was slit into a predetermined width of the trunk sheet and the bottom sheet.

Next, the bottom sheet is inserted while being folded at the lower part of the two front and back body sheets, the bottom sheet and the body sheet are sealed to form the first bottom seal part, and then the side seal part and the second bottom seal part Was sealed with an integrated seal bar to form a communication seal portion. A self-supporting packaging bag including a communication seal portion and a first bottom seal portion was formed. Moreover, it managed so that the position of a bottom part sheet | seat and the position of a communication seal | sticker part might not shift | deviate. A self-supporting packaging bag having a width of 250 mm, a height of 160 mm, a bottom sheet folding width of 45 mm, and a bottom-shaped self-supporting packaging bag as shown in FIG. 5 was prepared.

<Comparative Example 1>
The laminated sheet of Example 1 was used. The bottom sheet is inserted while being folded at the lower part of the two front and back body sheets, the bottom sheet and the body sheet are sealed, the bottom seal part is formed, and then the side seal part is formed linearly, Example 1 A self-supporting packaging bag with a boat-shaped bottom was created.

<Evaluation method>
The self-supporting packaging bags of Example 1 and Comparative Example 1 were filled with 1 L of distilled water. 100 bags were made for each. From the height of 60 cm, the packaging bag was checked for the presence or absence of broken bags when it was dropped once vertically in a concrete floor with the bottom on the bottom. n number = 100.

  The evaluation results are shown in Table 1.

In the self-supporting packaging bag of Example 1, no broken bag was observed. However, in Comparative Example 1, broken bags were observed in 5 bags. By sealing the side seal part and the second bottom seal part with an integrated seal bar, there is no step at the intersection where the bottom seal part and the side seal part are sealed, so it is clear that bag breakage does not occur. It was.

2 body sheet 3 bottom sheet 4 bottom seal part 5 first bottom seal part 6 second bottom seal part 7 side seal part 8 communication seal part 9 intersection part 21 first bottom seal bar 22 first bottom seal part cooling bar 23 first One seal process 24 Integrated seal bar 25 Communication seal portion cooling bar 26 Second seal process 27 Nip roll 28 Guide roll 29 Slit mechanism 30 Cutting mechanism 31 Self-supporting packaging bag 40 Laminated sheet 41 Base film layer 42 Adhesive layer 43 Sealant layer 44 Intermediate layer 50 Conventional self-supporting packaging bag A Insertion direction B Flow direction L Right line M Left line

Claims (2)

The bottom sheet is inserted into the lower part of the body sheet that is disposed opposite to the body sheet while being folded, and the body sheet and the bottom sheet are integrated at the bottom, and the body sheet is integrated on both sides. In the method of manufacturing a self-supporting packaging bag that can be self-supported by expanding the bottom sheet by forming a side seal part, the bottom seal part is a linear first bottom seal part extending in a horizontal direction, A second bottom seal portion extending obliquely from the side seal portion and reaching the first bottom seal portion, and a manufacturing method of a self-supporting packaging bag comprising:
Comprising a first sealing step for sealing the first bottom seal portion, and a second sealing step for simultaneously sealing the side seal portion and the second bottom seal portion,
The method for producing a self-supporting packaging bag, wherein the second sealing step seals the side seal portion and the second bottom seal portion with an integrated integrated seal bar.   The method for manufacturing a self-supporting packaging bag according to claim 1, wherein the second bottom seal portion is formed to be bent inward with respect to the width direction of the packaging bag.