JP2002019786A - Easily peelable bumping bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily peelable bumping bag capable of easily separating a polyolefin film such as a polyethylene film from a paper without containing components such as silicon and fluorine and without providing any layer containing silicon or fluorine. SOLUTION: In this easily peelable bumping bag, polyolefin containing maleic acids contains 30 ppm-1,000 ppm maleic acids, an interior sheet is a buffer olefin resin sheet having a polyolefin layer containing maleic acids at least in one surface, and a paper sheet and the interior sheet are arranged in an overlapping manner of the paper sheet and the polyolefin resin layer containing maleic acids as the interior sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily releasable buffer bag excellent in recyclability in which polyolefins and papers can be easily separated.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 9-99523 discloses a plastic film, a release film bonded to the plastic film, and a release film bonded to the release film so as to be easily peeled off from the release film. A laminate characterized by being formed by laminating a base material layer is disclosed.

JP-A-10-158616 discloses an adhesive composition (A) used for an adhesive surface of an information carrier sheet which is temporarily adhered but can be easily peeled off when necessary.
The polymerizable monomer (a1) wherein (A) is selected from the group consisting of alkyl acrylates having an alkyl group having 2 to 10 carbon atoms and alkoxyethyl acrylates having an alkoxy group having 1 to 4 carbon atoms. One or more of
One or more polymerizable monomers (a2) selected from the group consisting of acrylonitrile, methacrylonitrile, methyl acrylate, alkyl methacrylate having an alkyl group having 1 to 4 carbon atoms, and vinyl acetate; An adhesive composition for an information carrier sheet comprising an acrylic copolymer emulsion (a) obtained by emulsion polymerization of at least one polymerizable monomer (a3) having a functional group is disclosed.

[0004] Japanese Patent Publication No. Hei 8-506852 discloses that
(A) a release agent comprising a polymer having at least one vinyl polymer component and at least one siloxane polymer component having a Tg between -10 ° C and 65 ° C, and (b) one or more A high peel adhesive re-peelable adhesive composition comprising a high polymer, elastic microsphere and a mixture of an adhesive binder comprising at least one acrylamide based component that limits the interaction of the adhesive composition with the release agent. An encompassing system is disclosed.

Japanese Patent Application Laid-Open No. 7-329234 discloses a plastic embossed film having a large number of embosses, a plastic base film bonded to the embossed film, an opaque layer, and an opaque layer. In order to easily peel off, a buffer sheet laminated with a plastic release film attached to the opaque layer, the embossed film and at least one surface of the bubble portion having the base film A cushioning sheet having the release film attached thereto is disclosed.

Japanese Patent Application Laid-Open No. 7-329224 discloses a plastic embossed film having a large number of embosses, a plastic release film attached to the embossed film, and easy release from the release film. As described above, there is disclosed a buffer sheet in which the opaque layer laminated to the release film is laminated.

Japanese Utility Model Laid-Open Publication No. 57-95333 discloses a sheet body in which a plastic film is laminated on one surface of a paper sheet, and a bubble-sealed plastic sheet is further laminated. The entire length of the overlapping open edge other than the edge serving as the edge is heat-welded with the bubble-sealed plastic sheet interposed therebetween, and the entire edge of the bubble-sealed plastic sheet is inserted into the open edge to be heat-welded. A featured envelope is disclosed.

[0008] Japanese Patent No. 2978161 discloses that two overlapping plastic bubble sheets are interposed between the opposing paper sheets, and the total length of the overlapping open edges other than the edges that become the opening edges of the envelope is determined. While heat-sealing the bubble sheets with each other, heat-sealing each of the paper-quality sheets and the bubble sheet also to seal them tightly, and interposing an adhesive between each of the paper-quality sheets and the bubble sheet at the edge portion serving as the opening edge. There is disclosed an envelope formed by heat-sealing each paper-quality sheet having the entire length of the opening edge and a bubble sheet.

[0009]

However, a bag made of a conventional paper sheet and a polymer film is difficult to separate into a paper sheet and a polymer film when discarded. There is a problem that it is difficult to collect and reuse it as a raw material of a recycled polymer. For this reason, release sheets that can be separated by applying or containing a silicon product to a polymer film or laminating a silicon-containing release layer have been manufactured. The present invention provides an easily peelable buffer bag that can easily separate a paper from a polyolefin film such as a polyethylene film without providing a layer containing silicon or fluorine without containing components such as silicon and fluorine. The purpose is to provide.

[0010]

According to the present invention, at least one surface has 30 ppm to 1000 ppm, preferably 40 ppm.
pm to 1000 ppm, more preferably 50 ppm to
900 ppm, particularly preferably 100 ppm to 800 p
pm: an interior sheet made of a buffering olefin resin having a polyolefin layer containing maleic acid, and a paper sheet laminated with the maleic acid-containing polyolefin layer of the interior sheet. It relates to a buffer bag. The easily peelable buffer bag of the present invention,
It is preferable that the maleic acid-containing polyolefin layer of the paper sheet and the interior sheet be pasted so as to be easily peelable by applying heat at a temperature from the softening point to 250 ° C.

According to the present invention, at least 30 ppm
~ 1000ppm, preferably 40ppm ~ 1000p
pm, more preferably 50 ppm to 900 ppm, particularly preferably 100 ppm to 800 ppm. An interior sheet made of a buffering olefin resin having a polyolefin layer containing a maleic acid, and paper quality laminated with the maleic acid-containing polyolefin layer of the interior sheet The first and second laminated sheets made of a sheet are overlapped with each other so that the interior sheets face each other, and the outer peripheral portions excluding the opening ends are heat-sealed, so that the interior sheets facing each other are thermally fused. The present invention relates to an easily peelable buffer bag produced by laminating the paper sheet and the interior sheet so as to be easily peelable. In the easily peelable buffer bag of the present invention, at least one of the first and second laminated sheets applies heat at a temperature between the softening point and 250 ° C. of the maleic acid-containing polyolefin layer of the paper sheet and the interior sheet. Thereby, it is preferable that they are easily releasably bonded.

According to the present invention, at least 30 ppm
~ 1000ppm, preferably 40ppm ~ 1000p
pm, more preferably 50 ppm to 900 ppm, particularly preferably 100 ppm to 800 ppm. An interior sheet made of a buffering olefin resin having a polyolefin layer containing a maleic acid, and paper quality laminated with the maleic acid-containing polyolefin layer of the interior sheet The laminated sheet made of a sheet is bent at one side so that the interior sheet faces the other side, and the outer peripheral portions of both sides of the folded side are heat-sealed, so that the interior sheets facing each other are thermally fused. The present invention relates to an easily peelable buffer bag produced by laminating a paper sheet and an interior sheet so as to be easily peeled. The easily peelable buffer bag of the present invention, the laminated sheet, the paper sheet and the maleic acid-containing polyolefin layer of the interior sheet, the softening point or more by applying heat at a temperature of 250 ° C. or less, easily peelable pasting. Preferably, they are combined.

[0013] The easily peelable buffer bag of the present invention comprises an open end of the bag,
In the opening and at least a part of the vicinity thereof, the paper sheet and the maleic acid-containing polyolefin layer of the interior sheet were easily peelably bonded by applying heat at a softening point or higher and 250 ° C. or lower. An easily peelable buffer bag is preferred. Further, the easily peelable buffer bag of the present invention may be used before or after preparing a laminated sheet of the paper-like sheet and the maleic acid-containing polyolefin layer of the interior sheet at at least a part of the opening end of the bag, the opening, and the vicinity thereof. After that, it is preferable that the paper sheet and the maleic acid-containing polyolefin layer of the interior sheet are stuck so that they can be easily peeled off by applying heat at a temperature of not lower than the softening point and not higher than 250 ° C.

In the easily peelable buffer bag according to the present invention, a portion of the interior sheet protruding from the paper sheet is formed at an opening end or an opening of the bag, and the protruding portion can be used as a release port. Therefore, it is preferable.

In the easily peelable buffer bag of the present invention, it is preferable to provide a folded portion of the paper sheet at the opening end or opening of the bag.

In the easily peelable buffer bag of the present invention, the interior sheet may be a foamed sheet, a bubble-absorbing sheet, a buffer sheet in which a flat film is provided with a corrugated sheet, or a large number of communication between both surfaces. It is preferable to use any one of the buffer sheets provided with the ventilation holes.

The interior sheet may include a maleic acid-containing polyolefin layer, a foam sheet, a bubble buffer sheet, a buffer sheet in which a flat film is provided with a corrugated sheet, or a large number of communicating holes between both surfaces. A laminated body obtained by laminating any of the formed buffer sheets can be used.

As the interior sheet, a laminate of a maleic acid-containing polyolefin layer and a sheet of a buffering olefin resin can be used.

[0019] In the easily peelable buffer bag of the present invention, the phrase “the paper sheet and the maleic acid-containing polyolefin layer of the interior sheet are bonded so as to be easily peeled” means that the paper sheet and the interior sheet contain the maleic acid. The peel strength with the polyolefin layer is preferably 0.01 kg / 15 m
m to a strength smaller than the tensile strength of the maleic acid-containing polyolefin layer of the interior sheet, more preferably 0.01 to
~ 0.35 kg / 15 mm, more preferably 0.02
~ 0.33kg / 15mm, more preferably 0.03 ~
0.30 kg / 15 mm, particularly preferably 0.04 to
It is in the range of 0.28 kg / 15 mm.

The peel strength between the paper sheet and the maleic acid-containing polyolefin layer of the interior sheet is 0.01 kg.
/ 15 mm to less than the tensile strength of the maleic acid-containing polyolefin layer of the interior sheet, more preferably 0.01 to 0.35 kg / 15 mm, still more preferably 0.02 to 0.33 kg / 15 mm, and more preferably 0.03. ０．３0.30 kg / 15 mm, particularly preferably 0.04-0.28 kg / 15 mm.

The interior sheet having the maleic acid-containing polyolefin layer is superimposed on a paper sheet and pressed for 0.5 to 4 seconds, preferably for 0.5 to 4 seconds, while pressing with a sealing pressure of preferably 2.0 kg / cm ² . 130 ° C. to 195 for 0 to 3.5 seconds, especially 1.5 to 3.5 seconds.
° C, further 140 ° C to 185 ° C, especially 145 ° C to 175 ° C
C., the strength is smaller than the tensile strength of the maleic acid-containing polyolefin layer of the peel strength interior sheet, more preferably 0.01 to 0.35 kg / l.
5 mm, more preferably 0.02 to 0.33 kg / 1
5 mm, more preferably 0.03 to 0.30 kg / 15
mm, particularly preferably 0.04 to 0.28 kg / 15 m
An interior sheet and / or paper sheet having a maleic acid-containing polyolefin layer bonded in the range of m is preferred.

As the paper sheet, a paper sheet including kraft paper, corrugated cardboard, woodfree paper, stretched paper such as liner or crepe paper, or the like can be used. The thickness of the paper sheet can be appropriately selected depending on the application and the material. For example, when a paper sheet such as kraft paper or woodfree paper is used for packaging, the weight is 10 to 220 g /
m ² is preferable, and in consideration of transportability, durability and flexibility, a thickness of 30 to 100 g / m ² is more preferable.

The maleic acid-containing polyolefin layer is a layer composed of a copolymer of an α-olefin having 2 to 10 carbon atoms and maleic acid, or a modified polyolefin obtained by grafting maleic acid to polyolefin. As an α-olefin having 2 to 10 carbon atoms, linear α having 2 to 10 carbon atoms such as ethylene, propylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, and octene-1.
Olefins, α-olefins such as cyclic α-olefins such as cyclopentene and cyclohexene, and mixtures thereof. In particular, carbon number 2-1
0 as α-olefin, ethylene 50 mol% or more,
Furthermore, α-contains at least 60 mol%, especially at least 70 mol%.
Olefins are preferred. Maleic acids include unsaturated dicarboxylic acids such as maleic acid, itaconic acid and citraconic acid, and maleic anhydrides such as maleic anhydride, itaconic anhydride, citraconic anhydride and dimethyl maleate, which are anhydrides and esters of these acids. Derivatives can be used. The maleic acid-containing polyolefin layer does not contain a functional group such as an amine group, a ketone group, a carboxyl group, a hydroxyl group, a glycidyl group, and a cyano group other than the functional group formed by polymerization and modification of the maleic acid. The maleic acid-containing polyolefin layer has an α of 2 to 10 carbon atoms.
-A film or sheet containing or consisting of a copolymer of olefin and maleic acid, or a modified polyolefin obtained by grafting maleic acid to polyolefin can be used.

As a method of grafting maleic acid to polyolefin, for example, it can be produced by melt-kneading polyolefin such as polyethylene and maleic acid in the presence of a reaction initiator such as peroxide. The melt kneading is preferably performed at a temperature equal to or higher than the one-minute half-life temperature of the peroxide. As the reaction initiator, an organic peroxide-based reaction initiator such as t-butyl-hydroperoxide can be used. Also, 2,
Cumene dimers such as 3-dimethyl-2,3-diphenylbutane and derivatives thereof can be used.

Examples of the polyolefin include low-density polyethylene, high-density polyethylene, ethylene or an ethylene-based polymer such as a (co) polymer of ethylene and an α-olefin having 3 to 10 carbon atoms, propylene or a carbon atom having a carbon number other than propylene of 2 or less. Films composed of a (co) polymer mainly composed of propylene with α-olefins of 10 to 10 and polyolefins such as poly-4-methylpentene-1 can be used. The polyolefin can be produced using a known catalyst such as a single-site catalyst. As α-olefins having 3 to 10 carbon atoms, linear α-olefins having 2 to 10 carbon atoms such as propylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, and octene-1; , Cyclopentene, cyclohexene, etc.
Α-olefins such as olefins or mixtures thereof can be used. C2-excluding propylene
As α-olefins of 10, ethylene, butene-1,
Pentene-1, 4-methylpentene-1, hexene-
1, α-olefins such as linear α-olefins having 2 to 10 carbon atoms such as octene-1, cyclic α-olefins such as cyclopentene and cyclohexene, and mixtures thereof can be used. The polyolefin used in the present invention does not contain a functional group such as an amine group, a ketone group, a carboxyl group, a hydroxyl group, a glycidyl group, and a cyano group other than a functional group formed by polymerization and modification of maleic acid.

The interior sheet is preferably made of an ethylene polymer.

The thickness of the maleic acid-containing polyolefin layer, the maleic acid-containing polyolefin film or the maleic acid-containing polyolefin sheet in the present invention can be appropriately selected depending on the material to be used.
m to 20 mm, more preferably 0.5 μm to 15 mm, especially 1 μm
A range of m to 10 mm is preferred. As the maleic acid-containing polyolefin film or the maleic acid-containing polyolefin sheet, a film or sheet molded by a known method such as an extrusion molding method, an inflation method or a T-die method, and a molded product thereof can be used. As the maleic acid-containing polyolefin film or maleic acid-containing polyolefin sheet, not only a one-layer film or a one-layer sheet but also a multilayer film of two or more layers or a multilayer sheet of two or more layers can be used.

The interior sheet reduces the impact from the outside,
It is a buffer member that plays a role of protecting a package or the like.

The interior sheet excluding the maleic acid-containing polyolefin layer is a maleic acid-containing polyolefin used for the maleic acid-containing polyolefin layer, low-density polyethylene, high-density polyethylene, ethylene or ethylene and a functional group having 3 to 10 carbon atoms. -Polyethylenes such as (co) polymers mainly composed of ethylene with olefins, (co) polymers mainly composed of ethylene or ethylene and ethylene and α-olefins not containing a functional group having 3 to 10 carbon atoms, etc. Resins, propylene or a (co) polymer mainly composed of propylene with an α-olefin having 2 to 10 carbon atoms excluding propylene, and olefin resins such as poly-4-methylpentene-1 can be used. As α-olefins having 3 to 10 carbon atoms, linear α-olefins having 2 to 10 carbon atoms such as propylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, and octene-1; , Cyclopentene, cyclohexene, etc.
Α-olefins such as olefins or mixtures thereof can be used. C2-excluding propylene
As α-olefins of 10, ethylene, butene-1,
Pentene-1, 4-methylpentene-1, hexene-
1, α-olefins such as linear α-olefins having 2 to 10 carbon atoms such as octene-1, cyclic α-olefins such as cyclopentene and cyclohexene, and mixtures thereof can be used. As the olefin resin, a polymer containing a functional group such as a carboxyl group, an amine group, a ketone group, a hydroxyl group, a glycidyl group, and a cyano group can be used. The olefin resin can be produced using a known catalyst such as a single-site catalyst.

Depending on the application, the interior sheet excluding the maleic acid-containing polyolefin layer and the maleic acid-containing polyolefin layer may be made of a metal soap, a lubricant such as glycerin ester, an anti-blocking agent, a phenol-based, phosphorus-based, BHT-based or the like. Antioxidants, benzophenone,
Ultraviolet absorbers such as benzotriazole and HALS, inorganic and organic fillers such as talc, diatomaceous earth and mica, antistatic agents, surfactants and the like can be added.

The easily peelable buffer bag of the present invention can be used for envelopes, packaging bags, transport bags, transport bags, storage bags, thermal insulation bags, protective buffer bags, and the like.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, but it goes without saying that the present invention is not limited to the following embodiments.

FIG. 1 (c) is a plan view (c-1) and a sectional view (c-) showing an embodiment of the easily peelable buffer bag of the present invention.
2), (c-3) and (c-4), and a sectional view <c-
2) and (c-4) show an embodiment of a cross section perpendicular to the plane of the drawing passing through a dotted line AA in the plan view (c-1), and
-3) shows an embodiment of a cross section perpendicular to the plane of the paper passing through a dotted line BB in the plan view (c-1). And FIG.
(A), (b) is a schematic explanatory view showing a method for manufacturing the buffer bag 31 of FIG. 1 (c), and FIG. 1 (c) also serves as a schematic explanatory view showing this manufacturing method. The buffer bag 31 mainly includes the paper sheet 41 and the interior sheet 82. The interior sheet 82 has a maleic acid-containing polyolefin layer on at least one surface.

FIG. 2 shows a specific example of the interior sheet 82.
Pores 6 such as closed cells or open pores as shown in FIG.
1, a porous foam sheet 71 such as a sponge,
As shown in FIG. 2 (b), there is a bubble cushioning sheet 3 in which a large number of embosses 2 (projections) which are filled with a gas and held in an airtight manner are formed on at least one side.

FIG. 2 shows a specific example of the interior sheet.
As shown in (c), a buffer sheet 72 in which a corrugated plate 63 is attached to a flat film 62 can be used.
As a form of such a buffer sheet 72, it is also preferable that the corrugated sheet 63 is sandwiched between the flat films 62 and attached to each other to form a corrugated cardboard. The cross-sectional shape of the corrugated sheet 63 is not limited to a sin (sine) curve shown in FIG. In the buffer sheet 72, a corrugated sheet 63 having a maleic acid-containing polyolefin layer and / or a flat film 62 is used at least on the side in contact with the paper sheet, and a buffer sheet formed by attaching the corrugated sheet 63 to the flat film 62 is used. Can be done.

FIG. 2 shows a specific example of the interior sheet.
As shown in (d), a large number of communicating vent holes 6 between both surfaces
The buffer sheet 73 on which the sheet 4 is formed can also be used. The cross-sectional shape perpendicular to the length direction of the communication hole 64 is shown in FIG.
The shape is not limited to the square shown in (d), but may be a triangle, a hexagon, a circle or a semicircle.

In the present invention, as such an interior sheet, a light-weight, bubble-absorbing sheet having a large impact-absorbing ability is particularly preferably used. The reason weight matters is that
This is because the weight of the bag itself has an effect during use and during mailing.

Next, the structure of the buffer bag 31 will be described based on a preferred manufacturing method. In manufacturing the buffer bag 31, as shown in the process diagrams of FIGS. 1A to 1C, first, two sheets 51 and 52 are prepared. here,
The sheet on which the glue margin 44 is formed is referred to as “front sheet 51”.
The sheet on which the paste margin is not formed is referred to as “the back sheet 5
2 "(FIG. 1A).

In these sheets 51 and 52, the paper sheet 41 and the interior sheet 82 on the side of the maleic acid-containing polyolefin layer are overlapped or have a predetermined peel strength so that they can be easily peeled off. It is stuck to. In addition, when a maleic acid-containing polyolefin film or a maleic acid-containing polyolefin sheet is used as the maleic acid-containing polyolefin layer, the maleic acid-containing polyolefin film, the maleic acid-containing polyolefin sheet, and the interior sheet portion excluding the maleic acid-containing polyolefin layer are entirely It is preferable that they are bonded to each other or partially or that they are temporarily bonded.

Furthermore, it is preferable that the portion of the margin 44 in the front side sheet 51 is composed of only the paper sheet 41.
This means that the glue allowance 44 is adhered to the paper sheet 41 of the back side sheet 52, but if the interior sheet 82 is stuck to the glue allowance 44, the glue allowance 44 will be At the time of the final sealing of the open end, the paper sheet 41 of the back sheet 52 and the interior sheet 82 of the glue margin 44 must be adhered to each other. This causes a problem that complete separation is difficult.

As shown in the transition from FIG. 1 (a) to FIG. 1 (b), both of the prepared sheets 51 and 52 have a sheet quality sheet 41 near the opening end of the sheet 52.
The interior sheet 82 is not heat-sealed, the sheet 51 is not heat-sealed in the vicinity of the opening in the sheet 51, and the paper sheet 41 and the interior sheet 82 are not heat-sealed. The heat sealing portion 17 is formed while leaving the “peeling port” 18 (first heat sealing process). It is more preferable that the paper sheet 41 and the interior sheet 82 are not bonded to each other at the release port 18. If the interior sheet 82 at the release port 18 is used for release after using the bag, Is easy to peel off, which is preferable.

Next, as shown in the transition from FIG. 1B to FIG. 1C, the sheet 5 on which the heat seal portion 17 is formed is formed.
1 and 52 are overlapped so that the interior sheet 82 faces each other, and three sides of an outer peripheral portion serving as a bottom side and left and right sides are heat-sealed to form the heat seal portion 16 (second heat seal processing).
In this way, in the heat seal portion 16, the sheets 51.5
The two interior sheets 82 are firmly fused to each other, so that the buffer bag 31 is formed in a bag shape.

The formation of the heat sealing portion 16 causes the peeling port 18 to be thermally sealed at the left and right ends.
8 does not appear on the outside of the bag, and the paper sheet 41 and the interior sheet 82 from the release port 18 are used before or during use.
Separation from the substrate is avoided.

It is also preferable that a protective film is attached to the surface of the buffer bag 31, that is, the surface of the paper sheet 41. As the protective film, a film that can be easily peeled off from the paper sheet 41 can be used. When the protective film is bonded in this manner, it is preferable that the protective film is not bonded in a portion to be bonded to the portion of the paste margin 44. That is,
Even when the protective film is bonded, if the margin 44 is made of the paper sheet 41, it is preferable that the part to be bonded to the margin 44 is also made of the paper sheet 41.

Needless to say, the above-mentioned method of using the buffer bag by the four-sided heat seal is used when a buffer bag made from the front side sheet 51 having no glue margin 44 formed from the beginning is used. Even when the buffer bag 31 in which the paste margin 44 is formed is used, before or after the sent product is accommodated in the buffer bag, a dotted line C shown in FIG.
It can be used by performing processing such as cutting off the portion of the adhesive margin 44 along C. When the portion of the adhesive margin 44 is cut off along the dotted line CC shown in FIG. 1A before or after the sent product is accommodated in the buffer bag, the peeling openings 18 of the sheets 51 and 52 are heat-sealed. The ends can be sealed.

As shown in FIG. 1 (c-2), the method of using the buffer bag by the four-sided heat seal is as follows.
It can be used even when the interior sheet 82 is provided.

The margin 44 formed on the front sheet 51 is not always necessary. For example,
First, when the heat seal portion 17 is formed at the opening end portion of the envelope so that the cross-sectional structure shown in FIG. 1C-4 is obtained, the interior sheet 82 does not exist at the peeling opening 18. Thus, a buffer bag is manufactured using the front sheet 51 and the back sheet 52 having a predetermined structure.
Next, after the sent goods are stored in the buffer bag, the opening ends can be bonded together. In this case, the glue margin 44 becomes unnecessary.

As described above, the method of manufacturing the buffer bag 31 is to form the heat-sealed portion 16 from a state in which the paper sheet 41 and the interior sheet 82 are at least partially bonded together by some means in advance. Not limited to For example, from a state in which the paper sheet 41 and the side of the maleic acid-containing polyolefin layer of the interior sheet 82 are overlapped in advance, or a separate paper sheet 41 not bonded at all.
From the state where the maleic acid-containing polyolefin layer side of the interior sheet 82 and the maleic acid-containing polyolefin layer side of the interior sheet 82 are laminated, a heat seal portion is provided so that an appropriate peel strength can be obtained between the maleic acid-containing polyolefin layer side of the interior sheet 82 and the paper sheet 41. 16.1
7 can also be used.

As the bubble cushioning sheet, a bubble cushioning sheet 3 having convex closed cells and / or a laminate of an embossed film having a large number of projections (embosses) and a planar base film, and / or An embossed film having a large number of convex projections and a flat base film are attached to each other, and the embossed film having convex closed cells is further provided with a planar top film on the top surface of the convex projections. A bonded bubble cushioning sheet can be used. In the bubble cushioning sheet, it is preferable that one or more films selected from the base film and the top film are maleic acid-containing polyolefin films. In the bubble cushioning sheet, it is preferable that one or more films selected from a base film and a top film have a maleic acid-containing polyolefin layer.

The convex protrusions of the embossed film preferably have a flat shape at the tip, such as a plate or a column. More specifically, those having the shape of a cylinder, a prism, or a polygon are preferably used. . Other shapes include hemisphere,
Oval, elliptical, and the like are also preferable, and a plurality of convex protrusions having different shapes may be formed on one bubble cushioning sheet. Here, the position of the projections is not particularly limited, but it is preferable that the projections are arranged at a fixed interval such as a lattice shape or a mesh shape.

For example, in the use of a buffer bag having a side length of 44 cm or less, an embossment having an outer diameter of about 8 mm to 10 mm and a height of about 3 mm to 4.5 mm is used. The interval is 0.3mm-7m
When formed to have a value of m, it can be preferably used for envelopes and the like because of excellent impact resistance.

Incidentally, in the bubble cushioning sheet, the cushioning sheet 73 and the cushioning sheet 72 suitably used in the present invention,
In consideration of recyclability, it is preferable that a plurality of films and sheets to be used are made of the same material or a material having the same collection route.

[0053]

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited by the following examples.

[Measurement Conditions of Peeling Strength] The peeling strength was measured under the following conditions. -Peeling: T peeling, peeling speed: 50 mm / min, specimen width:
15 mm, measurement temperature: room temperature (23 ° C.).

Abbreviations and resins used in the production of the film. (1) LD1: Low density polyethylene (MI (190
C): 2.0 g / 10 min, density: 0.928 g / c
m ³ ). (2) SP1: an ethylene-α-olefin copolymer produced by a metallocene catalyst (MI (1
90 ° C.): 3.9 g / 10 min, density: 0.926 g / c
m ³ ). (3) HD1: High density polyethylene (MI (190
C): 5.7 g / 10 min, density: 0.963 g / c
m ³ ). (4) MP1: Maleic acid-modified polyethylene, maleic acid addition amount: 0.07% by weight, MI (190 ° C.): 1.5
g / 10 min, density: 0.920 g / cm ³ ). (5) MP2: an ethylene-α-olefin copolymer produced by a maleic acid-modified metallocene catalyst, maleic acid addition: 0.11% by weight, MI (190 ° C.):
4.0 g / 10 min, density: 0.915 g / cm ³ ).

[Examples 1 to 6, Comparative Examples 1 and 2] Films having a composition shown in Table 1 containing a small amount of an inorganic antiblocking agent were used as an embossed film, a base film and a top film, and three layers of bubble buffer were used. Sheets A to H were produced. The thicknesses of the embossed film, base film, and top film used in the production of the bubble cushioning sheets A to H were 37 μm, 27 μm, and 20 μm, respectively. The obtained bubble cushioning sheets A to H have a thickness of 4 m.
m, the diameter of the emboss was 9 mmφ.

Top films and high-quality paper of the obtained bubble-absorbing sheets A to H (yellow, basis weight: 100 g / m ² )
And a sheet was prepared by superimposing. This one sheet is bent at one side so that the bubble-absorbing sheet faces, and the outer periphery of both sides of the bent one side is heat sealer tester (TP701 manufactured by Tester Sangyo Co., Ltd.).
Mold), sealing pressure 2.0 kg / cm ² , sealing time 1 second, 2 seconds or 3 seconds, sealing temperature 150 ° C., 170 ° C.
Alternatively, lamination buffer bags A to H were produced under the condition of 190 ° C. The heat-sealed portions of the obtained buffer bags A to H were cut out, the peel strength was measured, and the results are shown in Table 2. In the heat-sealed portions of the obtained buffer bags A to H, the overlapped bubble buffer sheets were heat-sealed.

In the buffer bags A to F of Examples 1 to 6, when the peeled surface after the peel strength measurement was visually observed, the top film of the bubble buffer sheet and the fine paper were separated at the interface, and the fine paper was No resin component was observed, and no paper component was observed on the top film. Buffer bag G of Comparative Example 1
In, the top film of the bubble-absorbing sheet and the high-quality paper were easily peeled off, and the peel strength could not be measured. Comparative Example 2
In the buffer bag H, when the peeled surface after the peel strength measurement was visually observed, a considerable amount of paper components adhered to the top film, and the high quality paper and the top film were not easily peeled off.

[0059]

[Table 1]

[0060]

[Table 2]

[0061]

According to the present invention, the easily peelable buffer bag of the present invention can be used as a buffer sheet having a maleic acid-containing polyolefin layer containing polyolefin as a main component on the surface thereof without using a special film, and a paper material sheet such as kraft paper. And a buffer sheet and a paper sheet can be easily separated. The easily peelable buffer bag of the present invention can be used as an envelope.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view schematically showing an embodiment of an easily peelable buffer bag according to a first aspect of the present invention and a manufacturing method thereof.

FIG. 2 is a perspective view showing an example of an interior sheet suitably used in the easily peelable buffer bag of the present invention.

[Explanation of symbols]

2 ... emboss, 3 ... bubble cushioning sheet, 16 ... heat seal part, 17 ... heat seal part, 18 ... peeling port, 31 ... buffer bag,
41: paper sheet, 44: glue allowance, 51: front sheet, 5
2: Back sheet, 61: Pores, 62: Film, 63:
Corrugated plate, 64: communication hole, 71: foam sheet, 72, 73
... buffer sheet, 82 ... interior sheet.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 81/14 C (72) Inventor Koji Hironaka 8-1, Goi south coast, Ichihara city, Chiba prefecture (72) Inventor Katsumi Kimura 8-1, Goi Minami Coast, Ichihara City, Chiba Prefecture Ube Film Co., Ltd. (72) Inventor Toshiaki Shimada Toshiaki Shimada 8-1, Goi Minami Coast, Ichihara City, Chiba Prefecture F-term (reference) in Iruma Ichihara Plant 3E064 AA05 BA02 BA05 BA25 BA27 BA28 BA60 BB03 BC18 EA30 FA01 GA01 HN03 HN05 HU10 3E066 AA22 AA23 AA24 AA33 CA01 CA03 CB03 GA01 KA08 LA05 LA30

Claims (9)

[Claims] (1) at least 30 ppm to 1000 on one surface;
An easy-release property comprising: an interior sheet made of a buffering olefin resin having a polyolefin layer containing maleic acid at ppm and a paper sheet superposed with the maleic acid-containing polyolefin layer of the interior sheet. Buffer bag. 2. The paper sheet and the maleic acid-containing polyolefin layer of the interior sheet are stuck so that they can be easily peeled off by applying heat at a temperature from the softening point to 250 ° C. The easily peelable buffer bag according to claim 1. (3) at least 30 ppm to 1000 on one surface
An interior sheet made of a buffering olefin resin having a polyolefin layer containing maleic acid at ppm, and a first and second laminated sheet made of a paper sheet superposed with the maleic acid-containing polyolefin layer of the interior sheet, By overlapping the interior sheets so that they face each other, and heat-sealing the outer periphery except for the opening end,
An easily peelable buffer bag made by heat-sealing the facing interior sheets to each other and bonding the paper-like sheet and the interior sheet so that they can be easily peeled off. 4. At least one of the first and second laminated sheets can be easily formed by applying heat at a temperature between the softening point and 250 ° C. of the maleic acid-containing polyolefin layer of the paper sheet and the interior sheet. 4. The easily peelable buffer bag according to claim 3, wherein the bag is easily peelable. 5. At least 30 ppm to 1000 on one surface
The interior sheet faces a laminated sheet composed of an interior sheet made of a buffering olefin resin having a polyolefin layer containing maleic acid at ppm and a paper-like sheet superposed with the maleic acid-containing polyolefin layer of the interior sheet. By bending at one side as described above and heat-sealing the outer peripheral portions of both sides of the bent one side, the facing interior sheets are heat-fused with each other, and the paper sheet and the interior sheet are easily separated from each other. An easily peelable buffer bag made by bonding. 6. The laminated sheet, wherein the paper sheet and the maleic acid-containing polyolefin layer of the interior sheet are bonded so as to be easily peelable by applying heat at a temperature not lower than the softening point and not higher than 250 ° C. 6. The easily peelable buffer bag according to claim 5, wherein: 7. The paper sheet and the maleic acid-containing polyolefin layer of the interior sheet have a softening point of at least 25 at the open end of the bag, at the opening, and at least a part thereof.
By applying heat at a temperature of 0 ° C. or less, the adhesive layer is easily and releasably bonded.
7. The easily peelable buffer bag according to any one of 6. 8. The easy peeling method according to claim 1, wherein a portion of the interior sheet protruding from the paper sheet is formed at an opening end or an opening of the bag. Sex buffer bag. 9. The interior sheet may be a foamed sheet, a bubble cushioning sheet, a cushioning sheet in which a corrugated sheet is attached to a flat film, or a cushioning sheet having a large number of communicating vents formed on both sides. The easily peelable buffer bag according to any one of claims 1 to 8, which is any one of a sheet.