JP2012153399A - Packaging bag and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag which can be manufactured continuously, efficiently and at low cost and can make a bottom edge rigid.SOLUTION: A folding back flap 4 is formed at the bottom edge of a body 3 by piling a surface material part 4a and a back surface material part 4b and folding back them to the body back surface side and the back surface material part 4b in the folding back flap 4 is pasted on the back surface of the body 3 via an adhesive t and also the surface material part 4a in the folding back flap 4 is pasted on the back surface of the body 3 with the same adhesive t via a through-hole 5 formed on the back surface material part 4b in the folding back flap 4.

Description

  The present invention relates to a packaging bag for storing various articles such as food and confectionery, and a method for manufacturing the same, and in particular, it is referred to as a flat bag that does not have a flat bottom and is simply closed at the lower end of the body. The present invention relates to a packaging bag and a method of manufacturing the same.

  As a flat bag, for example, as shown in Patent Document 1, the lower end portion of a body portion formed in a flat cylindrical shape is bonded and folded, and the folded portion is covered and covered with coated paper (patent Documents 1 to 3) and the lower end of the body part are bonded, and the lower end part is further covered with a covering paper and bonded (see Patent Documents 4 to 7).

Japanese Utility Model Publication No. 60-76638

  The flat bag having the above-described structure has an advantage that the bottom end of the body portion can be made strong, but since another coated paper is used to close the bottom end of the body portion, not only the material cost is high, Since the bonding process is complicated, it is not suitable for continuous production in large quantities, and the production cost is high.

  Moreover, as what eliminates such a malfunction, for example, as shown in FIGS. 11 to 14, while continuously running the base paper 2 on which the perforation m for bag division is formed, the back surface material portion connected to the left and right of the surface material portion 2 a 2b is folded over the folding lines g and h as shown in FIG. 11 to FIG. 12, and the longitudinal sides of the back surface material portion 2b are bonded together with an adhesive s to form a flat body portion 3; As shown in FIGS. 13A and 13B, the bag material 6 is cut off through the perforation m, and the bag bottom end portion is folded back to the bag back side through the fold line i, so that the folded piece 4 protrudes greatly. As shown in FIG. 14, the adhesive margin portion 4c is considered to be bonded to the back surface of the body portion 3 with an adhesive t.

  In this configuration, it is possible to easily form a strong bottom without using another coated paper, but in order to form the glue margin 4c, the perforation m for cutting becomes a stepped shape. For this reason, a deep and large concave portion 7 is formed on the surface side of the opening end in the body portion 3, and the substantial depth of the bag becomes shallow, and the yield when obtaining a bag of a desired depth from the base paper is obtained. Decreased.

  The present invention has been made paying attention to such a situation, and can be manufactured continuously and efficiently and at a low cost, and the opening ends can be aligned, and the bottom end portion can be It is an object of the present invention to provide a packaging bag that can be made durable and a method of manufacturing the same.

  In order to achieve the above object, the present invention is configured as follows.

  (1) A packaging bag according to the present invention forms a folded piece in a two-ply state in which a front surface material portion and a back surface material portion are overlapped on the bottom end portion of the body portion and folded back to the body portion back surface side. The back material portion of the folded piece is bonded to the back surface of the body portion with an adhesive, and the surface material portion of the folded piece is bonded to the back surface of the body portion through a through hole formed in the back material portion of the folded piece. It is characterized by being bonded with an agent.

  According to the packaging bag of the present invention, by simply applying the adhesive once and folding the folded piece, the folded piece in a two-layered state is formed not only on the back surface part but also on the surface part. It can be bonded to the back surface, and a strong bottom can be easily formed without using another coated paper. Further, the opening end can be aligned, and the entire length or substantially the entire length of the body can be set as the bag depth.

  In a preferred embodiment, the through hole is a plurality of punched holes arranged along the longitudinal direction of the folded piece.

  According to this aspect, it is possible to ensure a large opening area of the entire through hole without reducing the strength of the back surface material portion in the folded piece, and the surface material portion in the folded piece is reliably attached to the back surface of the trunk portion through the through hole. Can be pasted together.

  In another preferred embodiment, the through hole is a punched long hole along the longitudinal direction of the folded piece.

  According to this aspect, the surface material portion in the folded piece is continuously bonded to the back surface of the body portion along the longitudinal direction of the folded piece, so that more reliable bonding can be performed.

  According to still another preferred aspect, a shallow concave portion for hooking a finger is formed at the opening end of the surface material portion in the trunk portion.

  According to this aspect, the bag can be easily opened while securing a bag depth substantially equal to the trunk length.

  (2) A method for manufacturing a packaging bag according to the present invention includes a body part folding process for folding a base paper in which a through hole for bonding is formed on a back surface part of a part corresponding to a bag bottom end part, and folding The body part laminating process for bonding the vertical sides of the back surface material, and the bottom end part of the body part is folded back to the back side of the body part with the surface material part and the back material part being overlapped. A bottom end portion laminating process is performed in which the folded piece in the two-layered state is pasted to the back surface of the body portion with an adhesive applied in a range including the through holes.

  According to the method of the present invention, the adhesive piece is applied once and the folded piece is folded, and the folded piece in a two-layered state is pasted not only on the back surface portion but also on the surface material portion on the back surface of the trunk portion. A strong bottom can be easily formed without using a separate coated paper.

  A preferred aspect is to form a perforation for each bag, and continuously run a long base paper in which the through holes for bonding are punched and formed on the back material portion of the portion corresponding to the bag bottom end, After sequentially passing through the body part folding process and the body part laminating process, a bag material is obtained by dividing at the perforation, the bottom end part laminating process is applied to the bag material, and two folded pieces are folded. In addition, it is characterized in that it is bonded to the back surface of the body part through an adhesive applied in a range including through holes.

  According to this aspect, it is possible to efficiently produce a strong flat bag at the bottom while continuously running a long base paper.

  Thus, according to the present invention, the packaging can be continuously and efficiently manufactured at low cost, the opening ends can be aligned, and the bottom end can be made durable. A bag can be obtained.

FIG. 1 is a perspective view of a packaging bag according to an embodiment of the present invention as viewed from the front side. FIG. 2 is a perspective view of the packaging bag of FIG. 1 as seen from the back side. FIG. 3 is a plan view of the base paper of the packaging bag. FIG. 4 is a plan view of the base paper that has undergone the body folding process in the base paper of FIG. FIG. 5 is a plan view of the bag material cut from the base paper. FIG. 6 is a perspective view showing a lower end portion folding step of the bag material. FIG. 7 is a front view of the completed packaging bag as seen from the back side. FIG. 8 is an enlarged view showing a cross section taken along the line aa in FIG. FIG. 9 is a perspective view showing the lower end folding process in the packaging bag according to another embodiment of the present invention. FIG. 10 is a perspective view of the packaging bag of another embodiment of FIG. 9 as seen from the back side. FIG. 11 is a plan view of a base paper in a comparative example. FIG. 12 is a plan view of the base paper that has undergone the body part folding process of the comparative example. FIG. 13A is a perspective view showing the lower end portion folding process of the comparative example, and FIG. 13B is a perspective view of the completed packaging bag as seen from the back side. FIG. 14 is a perspective view of the packaging bag of the comparative example as viewed from the front side.

  Hereinafter, a packaging bag according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a packaging bag according to an embodiment of the present invention as viewed from the front side, and FIG. 2 is a perspective view of the packaging bag of FIG. 1 as viewed from the back side. With reference to these drawings, the packaging bag 1 of the embodiment folds the back surface material portion 2b connected to the left and right ends of the surface material portion 2a to the back side, and bonds the vertical sides to form a flat body portion 3. At the same time, it is configured as a flat bag in which two folded pieces 4 are folded and bonded to the bottom end back surface of the body 3.

  Hereinafter, the manufacturing process of the packaging bag will be described with reference to FIGS.

  FIG. 3 shows the base paper 2 that is fed from the raw roll and continuously travels in a fixed direction F. The base paper 2 has a lateral width in which a back surface material portion 2b is provided on the left and right sides of the front surface material portion 2a, and is actually subjected to the following various processes while being run horizontally.

  First, a perforation m for separating the bag alone is formed at the top of the traveling path, and a plurality of round punched holes are formed as the through holes 5 for folding the folded piece at a position corresponding to the bag bottom end. In other words, so-called punch holes are formed in parallel along the lateral direction.

  Next, the adhesive S is continuously applied near the vertical side of one back surface material portion 2b, and then the other back surface material portion 2b is folded inward along the folding line g, and one back surface material is formed thereon. The portion 2b is folded inward along the fold line h and overlapped with the other back surface material portion 2b. As shown in FIG. 4, a flat body portion 3 in which the vertical sides of both back surface material portions 2b are bonded to each other is formed. It is formed continuously.

  Next, separation through the perforation m is performed, and a bag material 6 as shown in FIG. 5 is formed.

  As shown in FIG. 6, the folded piece 4 is formed on the bottom end portion of the body portion 3 of the bag material 6 so as to overlap the surface material portion 4a and the back surface material portion 4b. The adhesive t is applied to the material portion 4 b over a range including the through holes 5. Thereafter, the folded piece 4 is folded back along the folding line i to the back side of the body part, and the folded piece 4 is bonded to the back surface of the body part 3 to complete the packaging bag 1 as shown in FIG.

  In this case, as shown in FIG. 8, a part of the adhesive t applied to the back surface portion 4 b of the folded piece 4 is also applied to the surface material portion 4 a of the folded piece 4 through the through holes 5. The back surface material portion 4b of the piece 4 is bonded to the back surface of the body portion 3, and the surface material portion 4a of the folded piece 4 is also bonded to the back surface of the body portion 3 through the through holes 5, thereby providing a durable bag bottom end. Is formed.

  In this example, the longitudinal central portion of the perforation m is shallowly curved so that a shallow concave portion 7 for hooking a finger is formed at the opening end of the surface material portion 2a in the completed packaging bag 1.

(Other embodiments)
The present invention can also be implemented in the following forms.

  (1) As shown in FIGS. 9 and 10, the through hole 5 for laminating the folded piece may be a punched long hole along the longitudinal direction of the folded piece 4. In FIGS. 9 and 10, portions corresponding to those in FIGS. 1 to 8 are denoted by the same reference numerals.

  (2) In the above embodiment, the adhesive t is applied to the back surface material portion 4b of the folded piece 4 in order to bond the two folded pieces 4 to the back surface of the trunk portion 3. The surface material portion 4 a of the folded piece 4 can also be bonded to the back surface of the trunk portion 3 through the through-hole 5 by applying the adhesive t on the back surface and folding the folded piece 4 back together.

  (3) The depth of the recess 7 for facilitating the opening operation of the packaging bag 1 may be extremely shallow, or the recess 7 may be eliminated to completely align the open ends.

  (4) In the above embodiment, a simple flat bag having no gusset on the left and right is exemplified, but the present invention can also be applied to a case in which gussets are formed on the left and right of the body portion 3.

  (5) In the above embodiment, the perforation m is formed while the long base paper 2 is continuously run, the through holes 5 are punched out, and the body portion 3 is bonded, and then the bag material 6 is separated and the bottom Although the case where the bag is manufactured with high efficiency by performing the folding process of the end part is illustrated, the body part laminating process and the bottom end part of the base paper of the sheet on which the through holes 5 are formed are illustrated. It is also possible to complete the wrapping bag 1 by applying the folding and pasting process.

DESCRIPTION OF SYMBOLS 1 Bag for packaging 2 Base paper 2a Surface material part 2b Back surface material part 3 Body part 4 Folding piece 4a Surface material part 4b Back surface material part 5 Through-hole 6 Bag material 7 Recess m Perforation s Adhesive t Adhesive g Folding line h Fold Line i fold line

Claims (6)

  At the lower end portion of the body portion, the surface material portion and the back surface material portion are overlapped to form a folded piece folded back on the body portion back surface side, and the back surface material portion in the folded piece is attached to the back surface of the body portion with an adhesive. A packaging bag characterized in that the surface material portion of the folded piece is bonded to the back surface of the trunk portion with the same adhesive through a through hole formed in the back surface portion of the folded piece. .   The packaging bag according to claim 1, wherein the through holes are a plurality of punched holes arranged along a longitudinal direction of the folded piece.   The packaging bag according to claim 1, wherein the through hole is a punched long hole along a longitudinal direction of the folded piece.   The packaging bag according to any one of claims 1 to 3, wherein a shallow concave portion for hooking a finger is formed at an opening end of a surface material portion in the body portion. A body part folding process for folding a base paper in which a through-hole for bonding is formed on the back surface part of the part corresponding to the bag bottom end part on the back side;
The body part laminating process for bonding the overlapped vertical sides of the folded back material,
The bottom end portion of the body portion is folded back to the back surface side of the body portion in a state where the surface material portion and the back surface material portion are overlapped, and the folded piece of the folded two-layered state is applied to the range including the through hole. A bottom end laminating process for pasting to the back of the body part via an adhesive,
The manufacturing method of the packaging bag characterized by including.   Form a perforation for separation for each bag, and continuously run a long base paper in which the through holes for bonding are punched and formed on the back surface material portion corresponding to the bottom end of the bag, and the body part is folded. After the processing and the body part laminating process in sequence, a bag material is obtained by dividing at the perforation, the bottom end part laminating process is applied to this bag material, and the two-layer folded piece is perforated. 6. The method for producing a packaging bag according to claim 5, wherein the bag is pasted to the back surface of the body portion through an adhesive applied to the range to be included.

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