JP2012062106A - Package bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package bag that is capable of repetitive resealing by rolling up an unsealed opening of the package bag without providing an additional component.SOLUTION: The package bag includes a peripheral thermal adhesion part formed by mutually facing surfaces of thermally adhesive resin layers of laminated bodies formed by laminating a base material layer and the thermally adhesive resin layer via a hot melt adhesive layer, and hot gluing the periphery of the thermally adhesive resin layer. In the package bag, a half-cut part having a shape that is opened from the base material layer side is formed, and a non-formed part, where the hot melt adhesive layer is removed, is formed in an outer periphery of the peripheral thermal adhesion part.

Description

  The present invention relates to a packaging bag using a laminate in which a base material layer and a heat-adhesive resin layer are laminated via a hot melt pressure-sensitive adhesive layer, and more specifically, a configuration in which a half cut is applied from the base material layer side. Thus, the present invention relates to a packaging bag in which a packaging bag can be opened and a necessary amount of filled contents can be taken out, and then the opening is wound to reseal the opening.

  Conventionally, after the contents such as food and non-food are sealed and packaged in a packaging bag made of a laminate of plastic film, paper, etc., the contents that remain after being opened and used to take out the required amount are used. When using a plastic clip with two rims facing each other by elastic hinges at one end, the opening is sandwiched between the rims from both sides, and the inner surface of the opening is intimately contacted by the elastic hinge with the pressure of the clamping surface And the clip which closes an opening is known (for example, refer patent document 1).

  In addition, a pressure-sensitive adhesive is used to wind the opening portion of the packaging bag around the core to bring the inner surfaces into close contact with each other and to adhere to the outer surface of the wound portion that makes the inside of the bag airtight. A packaging bag having a configuration in which the attached reseal tag is integrally bonded to the outer surface of the packaging bag has been proposed (see, for example, Patent Document 2).

  However, the clip described in Patent Document 1 is necessary as a separate part from the packaging bag, which increases the cost. Also, if the clip is attached to the packaging bag as a part, the clip becomes bulky and the efficiency of loading on the transportation flight is deteriorated. There is a problem of cost. Moreover, the technique described in Patent Document 2 is bulky because a reseal tag that winds the opening portion of the packaging bag and adheres to the outer surface of the wound portion is integrally provided on the outer surface of the packaging bag. Because there is no extra transportation cost. However, although the re-seal tag is integrally bonded to the packaging bag as a separate part via a pressure-sensitive adhesive, there is a problem that it costs as a separate part and there is a step between the re-seal tag and the packaging bag. In the case of a filling machine that is supplied by stacking the packaged bags on a bag feeder, the reseal tag may peel off and separate from the packaging bag due to a step when receiving vibration or impact In the packaging bag stacked on the bag feeding device, the portion where the re-seal tag is attached becomes thicker, so the number of packaging bags stacked on the bag feeding device is reduced and the number of times the packaging bag is supplied increases, which takes more time. Since the packaging bags stacked in the bag feeding device are inclined, there is a risk that a bag feeding error is likely to occur when the packaging bags are fed one by one.

JP-A-2-42203 Registered Utility Model Publication No. 3050730

  Accordingly, the present invention has been made to solve the above problems, and provides a packaging bag that can be resealed by winding the opening of the packaging bag without providing a separate part. There is.

  This invention solves the said subject, and this invention of Claim 1 is said thermal adhesiveness of the laminated body by which the base material layer and the thermoadhesive resin layer were laminated | stacked through the hot-melt adhesive layer. A packaging bag provided with a peripheral heat-bonding portion by thermally bonding the periphery with the surfaces of the resin layers facing each other, the half-cut of the shape opened from the base material layer side, The outer peripheral edge is a non-formed part from which the hot melt pressure-sensitive adhesive layer is removed.

  Moreover, the present invention according to claim 2 is the packaging bag according to claim 1, wherein the half cut has a shape provided with a knob that protrudes toward the peripheral thermal bonding part, and the knob is the hot The melt-adhesive layer is a non-formed part removed.

  According to a third aspect of the present invention, in the packaging bag according to the first or second aspect, the half-cut position is a non-formed part from which the hot melt pressure-sensitive adhesive layer is removed. It is characterized by this.

  Moreover, this invention of Claim 4 is a packaging bag in any one of Claims 1-3, The overcoat layer is formed in the outer surface of the said base material layer, It is characterized by the above-mentioned.

  Moreover, the present invention according to claim 5 is the packaging bag according to any one of claims 1 to 4, wherein the laminate has an intermediate layer laminated between the hot melt pressure-sensitive adhesive and the thermal adhesive resin layer. It is the structure which was made.

  Moreover, this invention of Claim 6 is a packaging bag in any one of Claims 1-5. WHEREIN: The said laminated body is the structure by which the film which has linear tearability was laminated | stacked, It is characterized by the above-mentioned. is there.

According to the first aspect of the present invention, the periphery of the laminated body in which the base material layer and the heat-adhesive resin layer are laminated via the hot-melt pressure-sensitive adhesive layer face each other and the peripheral edges are thermally bonded. The peripheral bag is provided with a peripheral heat-bonding portion, half-cut in a shape opened from the base material layer side, and the hot melt pressure-sensitive adhesive layer is removed from the outer peripheral edge of the peripheral heat-bonding portion. By opening the packaging bag and taking out the required amount of the filled contents, the hot melt pressure-sensitive adhesive layer and the heat-adhesive resin layer of the laminate are cut from the half cut. A packaging bag in which a hot-melt pressure-sensitive adhesive layer surface is formed by wrapping an opening and forming a re-sealing piece with a hot melt pressure-sensitive adhesive layer exposed on the substrate layer side. By re-adhering to the base material layer surface, the opening can be resealed repeatedly Kill. Also, the outer peripheral edge of the peripheral heat-bonding part is configured such that the hot-melt pressure-sensitive adhesive layer is removed, and the hot-melt pressure-sensitive adhesive layer does not protrude from the outer edge of the peripheral heat-bonding part, so that dust adheres to the peripheral edge. The cutting blade that cuts the outer peripheral edge of the packaging bag does not come into contact with the hot melt pressure-sensitive adhesive layer during the manufacture of the packaging bag, and hot melt pressure-sensitive adhesive can accumulate on the cutting blade. The suitability for bag making is improved. In addition, the resealable piece is formed by half-cutting from the base material layer side to the laminate, and there is no need to attach another part such as a reseal tag, so there is no cost increase, and there is a step on the packaging bag. Since this does not occur, the number of stacks in the bag feeder increases, so the number of stacks is reduced and the filling work efficiency is improved. Furthermore, there is no need to prepare a re-seal tag member as a separate part as in conventional packaging bags, and there is no need for troublesome labor such as inventory management of the member, and the process for attaching the re-seal tag to the packaging bag does not increase. Up can be suppressed.

  Further, in the present invention described in claim 2, by adopting a configuration in which the hot melt pressure-sensitive adhesive layer is excluded from the knob, it becomes easy to pick and a resealable piece can be easily formed.

  Further, in the present invention according to claim 3, the hot melt pressure-sensitive adhesive layer is removed from the half-cut position so that the hot melt pressure-sensitive adhesive is applied to the blade that forms the half cut in the laminate. Since it does not contact, suitability for half-cut processing is improved.

  Further, the present invention according to claim 4 is a configuration in which an overcoat layer is formed on the outer surface of the base material layer, and after opening the packaging bag and taking out the filled content in a necessary amount, When storing the remaining contents, the packaging bag is wrapped around the opening opening as much as the contents are reduced, and the layer of the laminate is peeled off from the half cut to expose the hot melt adhesive layer. When sticking the exposed hot-melt pressure-sensitive adhesive layer surface of the re-sealed piece, it is easy to control the adhesive strength with the outer surface of the base material layer, so even if you re-seal the opening repeatedly, Good resealability is obtained without transfer of the hot-melt pressure-sensitive adhesive layer.

  Further, in the present invention according to claim 5, the laminated body is configured such that the intermediate layer is laminated between the hot melt pressure-sensitive adhesive and the heat-adhesive resin layer, thereby taking out the filled contents in a necessary amount. After that, the re-sealed piece can be easily formed by peeling the laminate from the half-cut between the hot-melt pressure-sensitive adhesive layer and the intermediate layer to expose the hot-melt pressure-sensitive adhesive layer on the base material layer side.

  In addition, the present invention according to claim 6 is a beautiful structure in which the laminate can be torn straight when the packaging bag is opened, because the laminate has a structure in which films having linear tearability are laminated. An opening can be formed. As a result, after the necessary amount of content filled from the opening is taken out, the operation of winding around the opening is made easy.

It is a perspective view which shows 1st embodiment of the packaging bag which concerns on this invention. (A) is a sectional view taken along line X1-X1 in FIG. 1, and (b) is a sectional view taken along line X2-X2 in FIG. It is the YY sectional view taken on the line of FIG. It is a perspective view which shows the state which reseals an opening after opening the packaging bag of 1st embodiment which concerns on this invention. It is a perspective view which shows 2nd embodiment of the packaging bag which concerns on this invention. It is a perspective view which shows the state which reseals an opening after opening the packaging bag of 2nd embodiment which concerns on this invention.

The above-described present invention will be described in detail below with reference to the drawings.
1 is a perspective view showing a first embodiment of a packaging bag according to the present invention, FIG. 2A is a cross-sectional view taken along line X1-X1 in FIG. 1, and FIG. 1B is a cross-sectional view taken along line X2-X2 in FIG. 3 is a cross-sectional view taken along line YY of FIG. 1, FIG. 4 is a perspective view showing a state in which the opening is resealed after opening the packaging bag of the first embodiment according to the present invention, and FIG. The perspective view which shows 2nd embodiment of a packaging bag, FIG. 6 is a perspective view which shows the state which reseals an opening after opening the packaging bag of 2nd embodiment which concerns on this invention, 1a, 1b in a figure Is an edge seal part, 2 is a back seal part, 3 is a half cut, 4 is a resealing piece, 5 is a picking part, 6 is a notch, 7 is an opening, 10 is a laminate, 11 is a base material layer, 12 is Hot-melt pressure-sensitive adhesive layer, 13 is an intermediate layer, 14 is a heat-adhesive resin layer, 15 is a release layer, 16 and 17 are adhesive layers, 18 is an overcoat layer, P1 and P2 are packaging bags, P1 ′, P2 ′ is the opened packaging bag, L is the length of the belt-like hot melt pressure-sensitive adhesive layer, and W is the width of the belt-like hot-melt pressure-sensitive adhesive layer.

  1 is a perspective view showing a first embodiment of a packaging bag according to the present invention, FIG. 2A is a sectional view taken along line X1-X1 in FIG. The X2-X2 line cross-sectional view of FIG. 1 shows the configuration of the laminated body of the peripheral thermal bonding portion, and FIG. 3 shows only the cross section of the front-side laminated body in the YY line cross-sectional view of FIG. The packaging bag P1 includes a base material layer 11, a hot melt pressure-sensitive adhesive layer 12, an intermediate layer 13, and a heat-adhesive resin layer 14, which are laminated in sequence through adhesive layers 16 and 17, and are thermally bonded to each other. A pillow-type packaging bag in which the surfaces of the conductive resin layer 14 are opposed to each other so that the edge is thermally bonded at the back seal portion 2 to form a cylindrical shape, and the open end is thermally bonded at the edge seal portions 1a and 1b. One of the edge seal portions 1a and 1b is thermally bonded first, and the other is sealed by heat bonding after filling the packaging bag with the contents. In the packaging bag P1 of the first embodiment, the edge seal portions 1a and 1b and the back seal portion 2 correspond to the peripheral heat bonding portion.

  The surface of the packaging bag P1 of the present invention (opposite surface of the back seal portion 2) has a substantially U-shape extending from the base material layer 11 side and extending in a band shape in a direction perpendicular to the edge seal portions 1a and 1b. The inner region surrounded by the U-shaped half-cut 3 is formed as a re-sealing piece 4, and the bulging portion on the edge seal portion 1a side of the U-shaped half-cut 3 is a knob. 2 and the non-formation part from which the hot-melt adhesive layer 12 was removed in the edge seal parts 1a and 1b and the back seal part 2 (not shown) which are the peripheral thermal adhesive parts as shown in FIG. It is said that.

  Further, the main part of the present invention will be described in detail with reference to FIGS. The laminated body 10 constituting the packaging bag P1 of the present invention is laminated through an adhesive layer 16 in which a base material layer 11 and an intermediate layer 13 are melt-extruded from polyethylene by an extrusion method, and thermally bonded to the intermediate layer 13. The adhesive resin layer 14 is laminated via an adhesive layer 17. Furthermore, the peeling layer 15 (refer FIG. 3) is formed in the string form at the adhesive layer 16 side of the base material layer 11 where the half cut 3 is located. A wide release layer 15 (see FIG. 2A) is formed on the side of the base layer 11 of the knob portion 5 on the side of the adhesive layer 16, and a non-formed portion from which the hot melt pressure-sensitive adhesive layer 12 is removed. Further, a hot melt pressure-sensitive adhesive layer 12 is formed in a band shape in the region other than the release layer 15 of the resealable piece 4. The width W (length in the direction parallel to the edge seal portion) of the belt-like hot melt pressure-sensitive adhesive layer 12 is usually 10 mm to 25 mm. The length L of the belt-shaped hot melt pressure-sensitive adhesive layer 12 (the length in the direction perpendicular to the edge seal portions 1a and 1b) is determined appropriately depending on the length between the inner edges of the edge seal portions 1a and 1b and the type of contents. However, it is usually set to 1/10 or more of the length between the inner edges of the edge seal portions 1a and 1b. The position to be provided is also determined by the application. A plurality of reseal pieces 4 may be provided between the inner edges of the edge seal portions 1a and 1b. It is good also as a structure which can respond even if the position which winds the opening opening of a packaging bag or folds becomes any position.

  Further, as shown in FIG. 2B, the edge seal portion 1b, which is a peripheral thermal bonding portion, is a non-formed portion from which the hot melt pressure-sensitive adhesive layer 12 is removed. Although not shown, the edge seal portion 1a and the back seal portion 2 are similarly non-formed portions from which the hot melt pressure-sensitive adhesive layer 12 is removed. In the packaging bag P1 of the present invention, as described above, the outer peripheral edge of the peripheral heat bonding portion and the position where the half cut 3 is applied are the non-formed portion from which the hot melt pressure-sensitive adhesive layer 12 is removed. It is a feature. Therefore, in the first embodiment, an example in which the hot melt pressure-sensitive adhesive layer 12 is formed only in the region of the resealable piece 4 surrounded by the half cut 3 is shown, but the present invention is not limited to this, and the present invention is not limited to this. It can also be formed in other parts without departing from the spirit of the invention. Further, the shape of the half cut 3 is not limited to the U-shape, and can be arbitrarily formed.

  As shown in FIGS. 2A and 3, an overcoat layer 18 is formed on the outer surface of the base material layer. As will be described later, the overcoat layer 18 is wrapped around the opening and resealed with the hot melt pressure-sensitive adhesive layer 12 exposed on the inner surface of the resealable piece 4, and then the resealable piece 4 is peeled off again and sealed again. It has a role of preventing the hot melt pressure-sensitive adhesive layer 12 of the resealable piece 4 from being transferred to the overcoat layer 18 side. That is, the adhesive force between the hot melt pressure-sensitive adhesive layer 12 and the overprint layer 18 is weaker than the cohesive force of the overprint layer itself and the adhesive force between the hot melt pressure-sensitive adhesive layer 12 and the base material layer 11 on the adhesive layer 16 side. I have to.

  The packaging bag of the present invention can be used for various types of bags such as a gusset, a pillow gusset, a three-side seal, and a four-side seal in addition to the form of the pillow type bag shown in the first embodiment. In addition, the adhesive layer 16 that bonds the base material layer 11 and the intermediate layer 13 of the laminate 10 and the adhesive layer 17 that bonds the intermediate layer 13 and the heat-adhesive resin layer 14 are known extrusion methods and dry methods. It can be formed by applying a laminating method, a non-solvent adhesive laminating method, or the like.

  Next, the usage method of the packaging bag 1 of this invention is demonstrated, referring FIGS. As shown in FIG. 1, after either one of the edge seal portions 1a and 1b is unsealed and filled with the contents from its open end, the other one of the unsealed edge seal portions 1a and 1b is Sealed by thermal bonding. FIG. 1 shows the sealed state. Thereafter, for opening, for example, the laminate 10 is torn along the inner edge of the edge seal portion 1a from a notch (not shown) provided in the vicinity of the inner edge of the edge seal portion 1a of the back seal portion 2 to open the opening. Form. Or it pulls in the direction which opposes the both sides of the laminated body 10 according to opening indication, and peels off the edge seal part 1a, and forms an opening. When removing the required amount of content from the opening and then storing the remaining content, the packaging bag is wound around the opening at the opening and the half cut 3 is surrounded. The laminate 10 is peeled between the release layer 15 and the adhesive layer 16 from the picking portion 5 of the resealable piece 4 and pulled up to be peeled between the layers of the hot-melt pressure-sensitive adhesive layer 12 and the adhesive layer 16 to form a base material layer. The re-sealable piece 4 with the hot-melt pressure-sensitive adhesive layer 12 exposed on the 11 side is formed, and the hot-melt pressure-sensitive adhesive layer 12 surface of the re-sealable piece 4 is formed on the outer surface (overcoat layer surface) of the packaging bag wound with the opening. By sticking, the opening 7 of the opened packaging bag P1 ′ is closed while maintaining the state where the opening is wound. Since the overprint layer 18 is formed on the surface of the base material layer 11, the opening can be repeatedly resealed. Therefore, it is possible to prevent the entry of dust and moisture into the packaging bag, and to protect the remaining contents temporarily, so that it can be hygienic. As another method, the opening of the packaging bag may be folded by the amount of the reduced contents and bonded with the re-sealing piece 4.

  In the packaging bag of the present invention, the position and shape for forming the half-cut 3 are not limited to those of the first embodiment, but are provided on the front surface (opposite side of the back seal portion) and the back surface (back seal side) of the packaging bag. You can also. FIG. 5 is a perspective view showing a packaging bag according to a second embodiment of the present invention. As shown in FIG. 5, the packaging bag P2 of the second embodiment of the present invention has a half cut 3 in the direction between the edge seal portions 1a and 1b along the back seal portion 2 near the center of the back surface of the packaging bag P2. A long U-shaped half cut 3 is applied. Others are the same as those in the first embodiment, and the same reference numerals are given and description thereof is omitted.

  FIG. 6 is a perspective view showing a state in which the opening 7 is resealed after opening the packaging bag P2 of the second embodiment according to the present invention, and after opening the packaging bag P2 as in the first embodiment, By re-sealing the opened opening 7 of P2 ′ to the packaging bag P2 ′ around which the hot-melt pressure-sensitive adhesive layer 12 with the exposed re-sealed piece 4 is wound, re-sealing becomes possible.

  Next, the laminated body 10 which comprises the packaging bag based on this invention is demonstrated. First, the material used for the heat-adhesive resin layer 14 of the laminate 10 may be any heat-adhesive resin that can be melted by heat and welded to each other, and can be appropriately selected and used depending on the required physical properties. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer , An ionomer resin, an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methacrylic acid copolymer, and the like.

  Next, as a base material used for the base material layer 11 of the laminate 10, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like can be used. , Uniaxially or biaxially stretched films using resins such as polypropylene and polypropylene, etc., and inorganic resins such as aluminum oxide and silicon oxide are deposited on these stretched films or resins having barrier properties such as polyvinyl alcohol The coated films can be used alone or in combination of two or more. Furthermore, a film having linear tearing properties such as uniaxially stretched polypropylene, high-density polyethylene or low-density polyethylene, nylon, and polyester film can be laminated to form a base material. The thickness of the film is not particularly limited as long as the waist (rigidity) is easy to peel off as a resealable piece and the strength is sufficient to withstand repeated resealing. Usually, the thickness is preferably 12 μm to 80 μm. Moreover, since printing is normally performed on the heat-adhesive resin layer 14 side of the base material layer 11, it has printability.

  Moreover, the intermediate layer 13 of the laminated body 10 is provided in order to provide gas barrier properties, such as oxygen gas and water vapor gas, and / or light-shielding properties. Examples of the material constituting the intermediate layer 13 include metal foils such as aluminum, iron, copper, and tin, films of polyvinyl alcohol, ethylene-vinyl acetate copolymer saponified products, polyvinylidene chloride, polyester, Polyamide, polyethylene, polypropylene, polyolefins such as ethylene-propylene copolymer, films made of polyvinyl alcohol, etc. or inorganic substances such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide The film etc. which gave vapor deposition of this can be used, and it selects suitably by the characteristic requested | required of the content to be packaged. Furthermore, a film having linear tearability can be used as the intermediate layer 13, and the laminate can be torn straight, so that the opening is clean and the operation of winding the packaging bag around the opening is easy. Become. Examples of the film having linear tearability include Toray Industries, Inc., Trefan BO YT12 and 22, Calchemical Y, Denki Kagaku Kogyo Co., Ltd., Hybron, Nobren, Idemitsu Petrochemical Co., Ltd., Mitsui Chemicals, Inc. UNIASRON TB1000 manufactured by UNICHIKA CORPORATION, Emblem NC and Emblet PC manufactured by Unitika Co., Ltd. may be mentioned. In particular, in the case of a pillow type packaging bag, Calarian Y manufactured by Denki Kagaku Kogyo Co., Ltd. and Trephan BO YT12, 22 manufactured by Toray Industries, Inc. are preferable. In addition, when laminating | stacking an intermediate | middle layer, a hot-melt adhesive layer is provided between a base material layer and an intermediate | middle layer.

As the hot-melt pressure-sensitive adhesive used for the hot-melt pressure-sensitive adhesive layer, a hot-melt composition containing a tackifier in a base polymer made of a thermoplastic resin is used. The base polymer component of this composition includes, for example, a styrene-isoprene block copolymer, a styrene-butadiene block copolymer, an acrylic resin, an ethylene-vinyl acetate copolymer, a block copolymer of vinyl aromatic and conjugated diene. A polymer, a hydrogenated product thereof, an ethylene-α-olefin copolymer, a polyester resin, or the like is used alone or in combination.
Examples of tackifiers include coumarone / indene resin, phenol resin, phenol / formaldehyde resin, terpene / phenol resin, polyterpene resin, xylene / formaldehyde resin, synthetic polyterpene resin, aromatic hydrocarbon resin, aliphatic cyclic hydrocarbon resin, hydrogen Additive hydrocarbon resin, hydrocarbon resin, polybutene, rosin, rosin ester, hydrogenated rosin, ester of hydrogenated rosin and monoalcohol or polyhydric alcohol, aliphatic petroleum resin, aromatic petroleum resin, and copolymerization Based petroleum resins.
In addition, a plasticizer, a viscosity modifier, an antioxidant, a filler and the like are appropriately added to the hot melt adhesive. Usually, the thickness of the hot melt pressure-sensitive adhesive layer is 5 to 20 μm.

  Examples of the release agent used for the release layer 15 include nitrified cotton-based, polyamide-based, polyester-based, acrylic-based, urethane-based, and alkyd-based resins. These may be used alone or in combination to form a gravure as a solution. The release agent layer 15 can be formed by part coating by a processing method such as printing or flexographic printing. Easy release property can be adjusted by mixing the release agent with wax or silicon as an additive. The release layer 15 is provided to be peeled off from the adhesive layer 16. When the release layer 15 is laminated between the release layer 15 and the adhesive layer 16 via an anchor coating agent, the release layer 15 is peeled off from the release layer 15 and the anchor coat layer. It is important to select a release layer.

  Examples of the overcoat layer 18 include nitrified cotton-based, polyamide-based, polyester-based, acrylic-based, urethane-based, and alkyd-based resins. These may be used alone or in combination, and gravure printing as a coating liquid. An overcoat layer can be formed by a processing method such as flexographic printing or roll coating. The adhesive force between the overcoat layer 18 and the hot-melt pressure-sensitive adhesive layer 12 of the resealable piece 4 can be adjusted by adding wax, silicon, or the like to the coating solution. It is the role of the overcoat layer to reliably prevent the hot melt pressure-sensitive adhesive layer 12 of the base material layer 11 from transferring to the outer surface of the packaging bag, and the adhesive force between the hot-melt pressure-sensitive adhesive layer and the overcoat layer is hot. What is necessary is just to determine a composition of a coating liquid so that it may not become larger than the adhesive force of a melt adhesive layer and the adhesive layer side of a base material layer.

  Next, the example of the manufacturing method of the packaging bag of this invention is demonstrated. First, a printed layer for design and display and a release layer are formed on one surface of the wound base material layer 11 by a printing method such as gravure printing or flexographic printing, and an overcoat (OP) layer is formed on the other surface. Form. Next, register the print layer and the release layer on the surface where the print layer and the release layer are formed, and remove the hot melt pressure-sensitive adhesive layer by using, for example, a gravure plate, etc. It is formed by pattern coating. Then, the surface of the hot melt pressure-sensitive adhesive layer formed on the base material layer and the intermediate layer or the heat-adhesive resin layer are laminated by an extrusion method or a dry lamination method. Thereafter, for example, half cutting is performed from the base material layer surface of the laminate with a punching machine equipped with a die roll having a half-cut blade of a predetermined size and shape. Thereafter, the bag is made into a predetermined form of packaging bag by a bag making machine. Note that the OP layer may be omitted when the hot melt pressure-sensitive adhesive layer forming step is performed in-line with the intermediate layer or the heat-bonding resin layer laminating step, but when it is performed off-line, the hot melt pressure-sensitive adhesive layer may be omitted. Since the surface opposite to the surface on which the agent layer surface and the printed layer of the base material layer and the release layer are formed are brought into contact with each other at the time of winding, it is necessary to form an OP layer.

  Next, the present invention will be described in more detail with reference to the following examples.

  Using a transparent biaxially stretched polyester film (PET) with a thickness of 12 μm for the base material layer, a printed layer with urethane ink on one side of PET, a string-like release layer with polyamide ink, and a wide release in the knob area An anchor coat (AC) layer was formed on the entire surface with a layer and a polyethyleneimine-based anchor agent, and an OP layer was formed on the entire surface with a polyamide-based ink on the other surface. After that, align with the printing layer and release layer with a hot melt coater, part coat with hot melt adhesive (HM) with acrylic resin as base polymer and terpene resin as tackifier at a predetermined position, thickness 10μm The intermediate | middle laminated body was produced by laminating | stacking the strip | belt-shaped hot-melt adhesive layer. Thereafter, sandwich lamination with a thickness of 15 μm is performed using melt-extruded low-density polyethylene (PE) between the HM layer surface of the intermediate laminate and the CPP using 30 μm-thick unstretched polypropylene (CPP) for the heat-adhesive resin layer. Thus, a laminate having a configuration of <OP layer / PET 12 μm / printing layer, release layer, AC layer / HM layer 10 μm / PE 15 μm / CPP 30 μm> was produced. Then, the half cut was formed in PET surface with the punching machine which mounted the punching die provided with the half cut blade of the predetermined shape in the laminated body. Then, the pillow type packaging bag P1 of 1st embodiment which produced the bag with the bag making machine and gave the half cut to the surface of the packaging bag was produced. The shape of the belt-shaped HM layer was a U-shape with a width of 25 mm and was formed along the back seal portion in the center of the packaging bag.

  Dry 12 μm thick transparent biaxially stretched polyester film (PET) and 12 μm thick transparent biaxially stretched polyester film (VMPET) with silicon oxide deposited on one side using a dry laminate adhesive. Laminated by the lamination (DL) method is used as a base material layer, and a laminate having a structure of <OP layer / PET 12 μm / DL / VMPET 12 μm / printing layer, release layer, AC layer / HM layer 10 μm / PE 15 μm / CPP 30 μm> is used. It was. Others were the same as in Example 1. The overcoat layer was provided on the surface of PET, and the print layer and release layer were formed on the PET surface of VMPET.

  Using 12 μm thick PET for the intermediate layer, sandwich lamination of PET and CPP 30 μm with 15 μm thick PE <OP layer / PET 12 μm / printing layer, release layer, AC layer / HM layer 10 μm / PE 15 μm / PET 12 / PE 15 μm / CPP 30 μm> was used. Half-cutting produced the pillow type packaging bag P2 of the second embodiment applied to the back surface of the packaging bag. Others were the same as in Example 1.

  Example 3 was the same as Example 3 except that a 20-μm-thick film having linear tearability (Denki Kagaku Kogyo Co., Ltd., Calarian Y) was used as the intermediate layer.

  Each of the packaging bags prepared in Examples 1 to 4 was filled with a snack and sealed. The packaging bags of Examples 1 to 4 could all be opened by tearing the packaging bag along the edge seal portion from the notch formed in the back seal portion. Then, after taking out only a part of the contents, winding the packaging bag by the amount of the contents reduced with the opening at the core, and pasting the exposed hot melt adhesive layer surface of the peeled re-sealed piece Moreover, any packaging bag of Examples 1-4 could hold the state where the opening was wound, and could close the opening. In particular, since the packaging bag of Example 4 was able to tear the packaging bag linearly along the edge seal portion, the operation of winding the packaging bag as much as the content was reduced with the opening as the core. It was easy.

DESCRIPTION OF SYMBOLS 1a, 1b Edge seal part 2 Back seal part 3 Half cut 4 Resealable piece 5 Pick part 6 Notch 7 Opening opening 10 Laminated body 11 Base material layer 12 Hot melt adhesive layer 13 Intermediate layer 14 Thermal adhesive resin layer 15 Peeling Layers 16, 17 Adhesive layer 18 Overcoat layer P1, P2 Packaging bag P1 ', P2' Opened packaging bag L Length of strip-shaped hot melt adhesive layer W Width of strip-shaped hot melt adhesive layer

Claims (6)

The peripheral heat bonding part was provided by thermally bonding the peripheral edges of the laminated body in which the base material layer and the thermal adhesive resin layer were laminated with the hot melt pressure-sensitive adhesive layer facing each other. The packaging bag is half-cut in an open shape from the base material layer side, and the outer peripheral edge of the peripheral heat-bonded part is a non-formed part from which the hot melt pressure-sensitive adhesive layer is removed. A packaging bag featuring. The half cut has a shape provided with a knob that protrudes toward the peripheral thermal bonding part, and the knob is a non-formed part from which the hot melt pressure-sensitive adhesive layer is removed. Item 15. A packaging bag according to item 1. The packaging bag according to claim 1, wherein the half-cut position is a non-formed part from which the hot melt pressure-sensitive adhesive layer is removed.
And packaging bag. The packaging bag according to claim 1, wherein an overcoat layer is formed on an outer surface of the base material layer. The packaging bag according to any one of claims 1 to 4, wherein the laminate has a configuration in which an intermediate layer is laminated between the hot-melt pressure-sensitive adhesive and the heat-adhesive resin layer. The packaging bag according to any one of claims 1 to 5, wherein the laminate has a structure in which films having linear tearability are laminated.

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