JP2014069883A - Packaging bag, and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag enabling a user to simply hold a surface sheet in opening a gusset packaging bag, and capable of being smoothly opened without distributing a force when opening, and to provide a method for manufacturing the same.SOLUTION: A packaging bag 10 comprises: a surface part 11; a bottom surface part 12; and a folding part between the surface part 11 and the bottom surface part 12. The surface part 11 and the bottom surface part 12 include: a tip end seal part 19 formed in a belt-like shape on right and left end parts in an area separated from one end; and a rear end seal part 20 formed in a belt-like shape on right and left end parts in the other end part. The surface part further includes: side end seal parts 15 and 17 formed in a belt-like shape from the tip end seal part to the other end in both the side end parts, a release material is provided in an inner surface of the surface part in an area from one end of the packaging bag to the tip end seal part 19, and an inner surface of the bottom surface part and the opposite surface of the folding part are bonded each other.

Description

  The present invention relates to a gusseted packaging bag having an opening means that can be easily opened, and a method for manufacturing the same.

Conventionally, a gusset packaging bag is known as a gusseted packaging bag having a wide storage portion (Patent Documents 1 and 2).
The gazette packaging bag shown in Patent Literature 1 includes a pair of flat surface portions constituting a front surface portion and a rear surface portion, and folding portions folded in a V shape toward the inside of the bag on both sides of the bag. The material comprising the at least one base layer and an easy peel sealant layer is a laminated film, and the easy peel sealant surfaces are aligned and heat-sealed to form a top seal, bottom seal, and side seal. Is formed, and two or more tearable treatments are provided at the end of the seal portion.

  Patent Document 2 includes a flat sheet that forms front and back surfaces, and a side sheet that forms gusset portions on both sides, and a peripheral seal portion that includes a side edge seal portion and both end seal portions on four sides of one flat sheet. In the flat quadrangular packaging bag heat-sealed in step 1, one end portion of one flat sheet is provided with an extending portion extending outward from one end seal portion on the same side, and one end portion The seal portion and the region extending from the end on the extending portion side of the side edge seal portion to the intermediate portion in the longitudinal direction are weaker than the other regions of the peripheral seal portion, which is a strong seal portion, and are peeled off. A gusset packaging bag is disclosed which is characterized by a possible weak seal.

JP 2006-199337 A JP 2011-235912 A

  The opening of the gusset packaging bag of Patent Documents 1 and 2 is performed by grasping and expanding the ends of a pair of sheets (front surface portion and rear surface portion) of the opening portion, and peeling off both side seal portions. However, since the gusset bag of Patent Documents 1 and 2 grips and pulls a pair of sheets, the force is dispersed into a force that expands the gusset portion of the gusset bag and a force that peels off both side seal portions. It was not easy to peel only one seal smoothly.

  In view of the above, an object of the present invention is to provide a packaging bag that can be opened smoothly without the force being dispersed when the gusset packaging bag is opened, and a method for manufacturing the same.

  The packaging bag of the present invention comprises a surface portion, a bottom portion facing the surface portion, and a folded portion provided between the surface portion and the bottom portion, and the surface portion and the bottom portion are regions separated from one edge. A front end seal portion formed in a strip shape extending from the left end portion to the right end portion, and a rear end seal portion formed in the other end portion extending in a band shape from the left end portion to the right end portion. The surface portion is a packaging bag having a side end seal portion formed to extend in a band shape from the tip seal portion to the other end at both side end portions, from one edge of the packaging bag to the tip seal portion. In the region, a release material is provided on the inner surface of the surface portion, and the inner surface of the bottom surface portion and the opposite surface of the folding portion are bonded to each other.

  The manufacturing method of the packaging bag of the present invention includes a step of providing a release material for each predetermined length in the longitudinal direction of the long first film sheet, and the long first film sheet and the long second film. A combination stage in which the sheet is conveyed in two upper and lower stages, and a pair of long third film sheets are folded and inserted and conveyed between the first and second film sheets, A first sealing step in which both side ends of the first, second and third film sheets are bonded to form a side end seal portion; and a direction perpendicular to the longitudinal direction of the first, second and third film sheets A second sealing step for forming a band-shaped tip seal portion by bonding with a third seal member for forming a partial seal portion by bonding the second film sheet and the third film sheet upstream of the tip seal portion Sealing stage and the formed partial Forming a gusset bag body having an opening at one end, and inserting a content into the gusset bag body from the opening, and then bonding the opening to form a rear end seal portion. And an encapsulation step.

  Since the folding part adhere | attaches the bottom face part in the opening part, the folding part does not become obstructive in the opening part, and can hold | grip only a surface part and a bottom face part easily. Further, since the fold portion is bonded to the bottom surface portion, the gusset portion is difficult to expand, and stress is concentrated on the tip seal portion, so that the opening operation is facilitated.

One Embodiment of the packaging bag of this invention is shown, (A) is a schematic plan view of a surface part, (B) is a schematic plan view of a bottom face part. It is sectional drawing of the horizontal direction along the AA in the packaging bag of FIG. It is sectional drawing of the horizontal direction along the BB line in the packaging bag of FIG. It is sectional drawing of the longitudinal direction along CC line in the packaging bag of FIG. It is a schematic perspective view which shows the sealing state in the packaging bag of FIG. It is a schematic perspective view which shows the open state in the packaging bag of FIG. It is sectional drawing which shows the modification of the packaging bag of this invention. It is sectional drawing which shows the other modification of the packaging bag of this invention. It is a schematic diagram which shows the process of one Embodiment of the manufacturing method of the packaging bag by this invention. It is a schematic diagram which shows the formation process of the partial seal | sticker part in the manufacturing method of the packaging bag of this invention. It is a schematic plan view which shows the positional relationship of the side end seal part of the packaging bag of this invention, a front-end seal part, and a partial seal part.

Embodiment of the packaging bag of this invention is described with reference to FIGS.
This invention is what is called a gusset packaging bag, Comprising: The packaging bag 10 of this embodiment is the front surface part 11 and the bottom face part 12, and the folding parts 13 and 14 inserted between the surface part 11 and the bottom face part 12. The folding portions 13 and 14 are bonded to the opposed surface portion 11 and bottom surface portion 12 in the side end seal portions 15 to 18 (see FIGS. 1 and 2).

The front surface portion 11 and the bottom surface portion 12 are planar rectangular sheets having the same shape and the same dimensions, which are stacked one above the other.
The folding portions 13 and 14 are sheets having the same length as the front surface portion 11 and the bottom surface portion 12 with respect to the longitudinal direction (X direction in FIG. 1), and the width direction (Y direction in FIG. 1) toward the fold inward. And is sandwiched between the surface portion 11 and the bottom surface portion 12 from both sides so that, for example, the cross section is V-shaped or curved.

  In the present specification, the two opposite sides of the quadrangle are referred to as the right side edge and the left side edge, the other two opposite sides are referred to as the one end edge and the other end edge, respectively, and the region including the side edge is referred to as the right side. The region including the end edge is referred to as one end and the other end. Further, the direction in which the end edges are opposed is referred to as the longitudinal direction, and the direction in which the side edges are opposed is referred to as the width direction.

  The front surface portion 11, the bottom surface portion 12, and the folding portions 13, 14 are bonded to each other at the front end seal portion 19 at one end and the rear end seal portion 20 at the other end (see FIGS. 1 and 4).

That is, the front surface portion 11 and the bottom surface portion 12 have a front end seal portion 19 extending in the width direction in a region separated from one end edge toward the other end, where the front surface portion 11 and the bottom surface portion 12 are the folding portions. 13 and 14 are bonded. The region separated from the one end edge toward the other end means, for example, a position 1 cm or more away from the one end edge, and is preferably 1 cm or more and 5 cm or less in consideration of easy picking of the opening portion. That is, the tip seal portion 19 is formed in a strip shape extending in the width direction at a position 1 cm or more away from one edge.
The rear end seal portion 20 may be provided in the width direction along the other end edge (rear end edge) of the surface portion 11 and the bottom surface portion 12, or may be provided away from the rear end edge.

  In the front seal portion 19 and the rear seal portion 20 where the front surface portion 11 and the bottom surface portion 12 overlap with the folding portion 13 or 14, the inner surfaces of the front surface portion 11 and the bottom surface portion 12 are bonded to the facing surfaces of the folding portions 13 and 14. In the front end seal portion 19 and the rear end seal portion 20 that are not overlapped with each other, the inner surface of the surface portion 11 and the inner surface of the bottom surface portion 12 are bonded to each other. That is, in the front end seal portion 19 and the rear end seal portion 20, the inner peripheral surfaces of the surface portion 11, the bottom surface portion 12, and the folding portions 13 and 14 are bonded.

  Both side ends of the surface portion 11, the bottom surface portion 12, and the folding portions 13 and 14 are bonded at side end seal portions 15, 16, 17, and 18. (See FIG. 2).

Both side ends of the surface portion 11 are side end seal portions 15 and 16 (see FIG. 1A) formed to extend in a band shape from the tip seal portion 19 to the other end, and are side ends of the inner surfaces 13a and 14a of the folding portions. (See FIG. 2). The side end seal portions 15 and 16 are formed to extend from the front end seal portion 19 of the surface portion 11 to the other end edge in a band shape.
On the other hand, both side ends of the bottom surface portion 12 are side end seal portions 17 and 18 (see FIG. 1B) formed to extend in a band shape from one end to the other end, and the side ends of the inner surfaces 13b and 14b of the folding portion. Glued. The side end seal portions 17 and 18 are formed so as to extend in a belt shape from one end edge to the other end edge of the bottom surface portion 12.

  The side end seal portions 15 to 18, the front end seal portion 19, and the rear end seal portion 20 are the surface portion and the bottom surface portion, respectively, and form a peripheral seal portion. Further, as described above, the front end seal portion 19 is formed in a region separated from one end edge toward the other end, so that one end portion of the surface portion 11 and the bottom surface portion 12 is more than the front end seal portion 19. Opening portions 21 and 22 extending outward are formed (see FIGS. 1A and 1B). As described above, the unsealed portion 21 of the surface portion 11 has no side end seal portion.

In the opening portion 22 of the bottom surface portion 12, the inner surface of the bottom surface portion 12 is bonded to the surface of the folding portions 13b and 14b facing the bottom surface portion 12. (Refer to FIG. 1 (B) and FIG. 3. Note that this adhesion region is referred to as partial seal portions 23 and 24).
The partial seal portions 23 and 24 may be bonded over the entire surface of the bonding region, or may be bonded by forming a predetermined pattern such as a point seal.
On the other hand, the surface part 11 and the folding parts 13a and 14a are not bonded.

In the present embodiment, the adhesion of the side end seal portions 15 to 18, the front end seal portion 19, the rear end seal portion 20, and the partial seal portions 23 and 24 is preferably heat fusion.
The adhesive strength of the side end seal portions 15 to 18 and the tip seal portion 19 is desirably in the range of 2 to 15 N / 15 mm. The partial seal portions 23 and 24 are more resistant than the strength of the side end seal portions 15 to 18 and the tip seal portion 19. It is desirable to have a strong strength, for example, a strength exceeding 15 N / 15 mm. If the adhesive strength is in the range of 2 to 15 N / 15 mm, it is generally assumed that there is easy peeling, and is easy to peel off. However, if the adhesive strength exceeds 15 N / 15 mm, it is difficult to peel off. Has been.
Therefore, the adhesive strength of the side end seal portions 15 to 18 and the tip seal portion 19 which are portions to be peeled off by the packaging bag of the present invention is set in the range of 2 to 15 N / 15 mm, and the partial seal portions 23 and 24 which are portions that are not peeled off. It is desirable that the adhesive strength exceeds 15 N / 15 mm.

  When the adhesion is thermal fusion, the front surface portion 11, the bottom surface portion 12, and the both folding portions 13, 14 are made of a packaging sheet material in which a sealant layer is laminated on a base material layer. For example, a laminated sheet laminated in the order of the base material layer / intermediate layer / sealant layer from the outer surface side can be used.

As the base material layer, for example, a film generally used as a surface layer such as polyethylene terephthalate (PET), stretched polypropylene (OPP), nylon (registered trademark) or the like can be selected and used according to the purpose.
The intermediate layer is selected according to the contents to be accommodated in the packaging bag. For example, an aluminum thin film or aluminum vapor deposited PET, silica vapor deposited PET, binary vapor deposited PET, alumina vapor deposited PET, low density polyethylene, nylon or other films or resins Can be selected and used according to the purpose. In addition, you may make it provide an intermediate | middle layer as needed.

  The sealant layer is not particularly limited, but a resin or film containing an easy-peeling temperature zone, preferably exhibiting an easy-peeling property or a strong sealing property due to a difference in heat fusion temperature. The film which can be used can be used. For example, a lock & peel film manufactured by Enshu Kasei Kogyo Co., Ltd. can be mentioned.

The surface portion 11, the bottom surface portion 12, and the both folding portions 13 and 14 may be the same or different in the base material layer and the intermediate layer.
Moreover, since adhesion | attachment is heat sealing | fusion, the surface part 11, the bottom face part 12, and both the folding parts 13 and 14 are arrange | positioned so that sealant layers may each oppose.

  In addition, as will be described later, a release material is provided on the sealant layer of the opening portion 21 of the surface portion 11 (not shown). The release material can be provided on the sealant layer by applying a release agent such as a release varnish on the unsealed portion 21 of the surface portion 11 or sandwiching a material capable of peeling, for example, a release tape.

  Adhesion at the rear end seal portion 20 is performed after the contents are accommodated, and the packaging bag 10 of the present embodiment is completed (see FIG. 5).

  As described above, the packaging bag 10 according to the present embodiment is a gusset bag including the folding portions 13 and 14 provided on both side ends between the surface portion 11 and the bottom surface portion 12 and having seal portions on all sides. In the bottom surface portion 12, the inner surface of the opening portion 22 is bonded to the opposing surfaces of the folding portions 13 and 14 by the partial seal portions 23 and 24, but in the surface portion 11, the inner surface of the opening portion 21 is the folding portion. 13 and 14 are not bonded to the opposing surfaces. Therefore, in the opening part 21, only the surface part 11 is in the open state, and the opening parts 21 and 22 can be easily gripped (see FIG. 3).

  Further, since the opening portion 22 of the bottom surface portion 12 is bonded to the folding portions 13b and 14b, the partial seal portions 23 and 24 are peeled off when a tensile force is applied to the opening portions 21 and 22 in a direction away from each other. It is difficult to prevent the opening from spreading unintentionally, and the packaging bag can be opened smoothly without the force being dispersed at the time of opening.

In the above-described embodiment, the folding portions 13 and 14 are disposed on both side ends between the surface portion 11 and the bottom surface portion 12, and the side ends of the surface portion 11 and the bottom surface portion 12 and the portions 13 a of the folding portions 13 and 14. , 14a, 13b, and 14b are adhered to the side ends. That is, the side end seal portion is provided on both the front surface portion 11 and the bottom surface portion 12. However, the side end seal portions 17 and 18 on the bottom surface portion 12 side may be omitted.
An example of a modified embodiment in which the side end seal portion is provided only on the surface portion 11 is shown in FIGS.

  In the modification shown in FIG. 7, in the packaging bag 30, both folding parts 13 and 14 are integrally connected to corresponding side edges of the bottom part 12.

The packaging bag 40 shown in FIG. 8 includes a back-sealed seal portion 41 joined by a so-called palm seal along the longitudinal center of the bottom surface portion 12. In addition, in FIG. 8, although the back sticking seal | sticker part 41 exists in a center part, it is not limited to this position.
The packaging bag 30 or the packaging bag 40 can be opened easily as well as the packaging bag 10 and is stored in the boat shape at the bottom portion and the folded portions on both sides at the time of opening or after opening. The contents will not spill.

The manufacturing method of the packaging bag 10 is demonstrated with reference to FIG. In the present embodiment, an example of adhesion by heat fusion will be described.
A stripping agent (not shown) such as a stripping varnish is previously applied to the sealant layer side of the portion that becomes the unsealed portion 21 in a predetermined length range from a cutting line 60 to be described later, for each predetermined length in the longitudinal direction. The first film sheet 51 to be the surface portion 11 to which is applied) is prepared.
In the bag making stage, as shown in FIG. 9A, a long first film sheet 51 to be the surface portion 11 and a long second film to be the bottom surface portion 12 prepared in advance. A sheet 52 and a pair of long third film sheets 53 and 54 to be the left and right folding parts 13 and 14 are used.

FIG. 9B shows a combination stage in which the third film sheets 53 and 54 are folded and arranged between the first film sheet 51 and the second film sheet 52.
The first film sheet 51 and the second film sheet 52 are conveyed in two upper and lower stages, and between the first film sheet 51 and the second film sheet 52, in the vicinity of both side ends thereof, the third film. The sheets 53 and 54 are inserted by being folded in half so that the creases are inside.
At this time, the folded side edges of the third film sheets 53 and 54 are aligned along both side edges of the first film sheet 51 and the second film sheet 52.
The combining step can be performed using, for example, a conventional bag making machine.

In the first sealing stage shown in FIG. 9C, a pair of sealing members (not shown) heated to a predetermined temperature from above and below along the side edges of the first film sheet 51 and the second film sheet 52. Are abutted at a predetermined pressure.
At this stage, both ends of the first, second and third films are heat-sealed and bonded.
That is, side end seal portions 55 and 56 (corresponding to reference numerals 15 and 16 in FIGS. 1 to 8) are formed between the first film sheet 51 and the surface film side portions of the third film sheets 53 and 54. In addition, side end seal portions 57 and 58 (corresponding to reference numerals 17 and 18 in FIGS. 1 to 8) between the second film sheet 52 and the bottom film side portions of the third film sheets 53 and 54. Is formed. However, since the part by which peeling agents, such as peeling varnish, of the 1st film sheet 51 are apply | coated cannot be adhere | attached by heat sealing | fusion, a side end seal part is not formed.

In the second sealing step shown in FIG. 9D, the first, second and third film sheets 51 to 54 are heated to a predetermined temperature from above and below at regular intervals in the longitudinal direction. The pair of sealing members (not shown) are brought into contact with each other with a predetermined pressure, and heat fusion is performed.
Thereby, the front-end seal | sticker part 59 (it corresponds to the code | symbol 19 of FIGS. 1-8) extended in the width direction of a 1st-3rd film is formed.

In the third sealing stage shown in FIG. 9 (E), the leading end seal portion 59 and the cutting line 60 (dotted line) located upstream of the leading end seal portion 59 with respect to the first to third film sheets 51-54. Thermal fusion is performed at the opening portion between the two. Thereby, the opposing part of the 2nd film sheet 52 and the 3rd film sheets 53 and 54 is heated, and the partial seal parts 61 and 62 are formed.
However, since the part to which the release agent of the first film sheet 51 is applied cannot be bonded by thermal fusion, the partial seal portion is not formed.

  As shown in FIG. 10, when the seal member 63 heated to a predetermined temperature from below is brought into contact with the bottom surface side, a non-heating member 64 such as rubber is brought into contact with the first film sheet 51 side. May be.

  In addition, the first sealing step, the second sealing step, and the third sealing step may be performed sequentially, may be moved in order, or two or more steps may be performed in combination. For example, after the first sealing stage, the second sealing stage and the third sealing stage may be performed simultaneously.

  After the first sealing stage, the second sealing stage, and the third sealing stage are completed, the first film sheet 51 and the second film sheet 52 are formed along the cutting line 60 on the upstream side of the partial seal portion. And the 3rd film sheets 53 and 54 are cut | disconnected in the width direction, and are divided | segmented into each packaging bag 10 (refer FIG.9 (F)). This cutting step may be performed simultaneously with the last sealing step among the first sealing step, the second sealing step, and the third sealing step.

  Finally, after the contents 65 are inserted into the cut individual packaging bags 10 from the opening 10a on the side opposite to the tip seal portion 59 in the sealing stage shown in FIG. In 10a, the 1st, 2nd, and 3rd film sheets 51-54 are heat-sealed, and the rear-end seal part extended in the width direction is formed. Thus, as shown in FIG. 5, the packaging bag 10 containing the contents 65 is completed.

Next, examples of the packaging bag according to the present invention will be described.
As the first film sheet 51 to be the surface portion 11 and the second film sheet 52 to be the bottom surface portion 12, the width as the third film sheet 53, 54 to be the original fabric roll having a width of 50 mm and the folding portions 13 and 14 A 40 mm original fabric roll was used. As the raw roll, a laminate having a three-layer structure of a base material layer, an intermediate layer and a sealant layer was used as shown below.
Base material layer: nylon film (Toyobo Co., Ltd., Harden N1102, thickness 15 μm)
Intermediate layer: low-density polyethylene film (Asahi Kasei Chemicals Corporation, Suntec L1850K, thickness 15 μm)
(Sealant layer: Mitsui Chemicals Tosero CMPS 013C, thickness 30 μm)

According to the manufacturing method shown in FIG. 9, the packaging bag of the present invention including the side seal portions 55 and 56 having a width of 5 mm, the tip seal portion 59 having a width of 5 mm, and the partial seal portions 61 and 62 having a width of 15 mm × length of 15 mm is formed. did.
A release varnish (manufactured by DIC, polycoat P-91, coating film 2 μm) was applied in advance to the sealant layer of the portion (50 × 15 mm) to be the opening portion 60a of the first film sheet 51.
FIG. 11 shows the positions and dimensions of the side end seal portions 55 and 56, the tip seal portion 59, and the partial seal portions 61 and 62.

  The side end seal part, the front end seal part, and the rear end seal part (not shown) have a seal pressure of 0.5 MPa, a seal time of 0.75 seconds, a seal temperature of 150 ° C. Formed.

As Comparative Example 1, a packaging bag was produced without applying a release varnish to the first film sheet.
The packaging bag of Comparative Example 1 was difficult to grasp because the opening portion was adhered, and could not be easily opened.

  Further, as Comparative Example 2, a packaging bag in which the third sealing step was omitted and the unsealed portion was not heat-sealed was produced. In this packaging bag, it is difficult to peel only the surface part, and since the bottom part and the folding part are not bonded in the opening part, the bottom part is also peeled off at the time of opening, and the contents are spilled off, or I was hurt.

  The present invention includes the above-described embodiment and packaging bags other than the examples without departing from the spirit of the present invention.

10, 30, 40 Packaging bag 10a Opening port 11 Surface portion 12 Bottom portion 13, 14 Folding portion 13a, 13b, 14a, 14b Folding portion 15, 16, 17, 18 Side end seal portion 19 Front end seal portion 20 Rear end seal portion 21 Unsealed part (surface part)
22 Opening part (bottom part)
23, 24 Partial seal portion 41 Back-sealed seal portion 51 First film sheet 52 Second film sheet 53, 54 Third film sheet 55, 56, 57, 58 Side end seal portion 59 Tip seal portion 60 Cutting line 60a Unsealed part 61, 62 Partial seal part 63 Seal member 64 Non-heated member 65 Contents

Claims (3)

It consists of a surface part, a bottom part facing the surface part, and a folded part provided between the surface part and the bottom part,
The front surface portion and the bottom surface portion are formed in a region separated from one end edge, extending from the left end portion to the right end portion in a band shape, and at the other end portion, from the left end portion to the right end portion. A rear end seal portion formed extending in a band shape,
The surface portion is a packaging bag having side end seal portions formed to extend in a band shape from the tip seal portion to the other end at both side end portions,
In the region from the one end edge of the packaging bag to the tip seal portion, a release material is provided on the inner surface of the surface portion, and the inner surface of the bottom surface portion and the opposite surface of the folding portion adhere to each other. Packaging bag. In the longitudinal direction of the long first film sheet, providing a release material for each fixed length;
The long first film sheet and the long second film sheet are conveyed in two upper and lower stages, and a pair of long third film sheets are interposed between the first and second film sheets. A combination stage in which the folds are folded and inserted and conveyed,
A first sealing stage for adhering both side edges of the first, second and third film sheets to form a side edge seal portion;
A second sealing step in which the first, second and third film sheets are bonded in a direction perpendicular to the longitudinal direction to form a strip-shaped tip seal portion;
On the upstream side of the tip seal part, a third sealing step of forming a partial seal part by bonding the second film sheet and the third film sheet,
Cutting the upstream side of the formed partial seal part, and forming a gusset bag body having an opening at one end;
A packaging bag manufacturing method, comprising: a step of adhering the contents into a gusset bag body through the opening and then bonding the opening to form a rear end seal portion.   The manufacturing method of the packaging bag of Claim 2 which performs a said 2nd sealing step and a said 3rd sealing step simultaneously.

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