JP2006298378A - Cellular shock-absorbing sheet, and shock-absorbing bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cellular shock-absorbing sheet which is free from dispersion in the welding strength at the welding position, and is capable of manufacturing a difficult-to-break bag when manufacturing the bag by overlapping a plurality of the cellular shock-absorbing sheets each other, or folding and overlapping one cellular shock-absorbing sheet. <P>SOLUTION: The cellular shock-absorbing sheet 1 consists of a cap film 2 having a plurality of projecting parts 4 formed on an upper side, and a flat base film 3 on a lower side. The cap film 2 and the base film 3 are affixed to each other. A welding margin 5 is provided around the entire periphery of an outer peripheral portion of the cellular shock-absorbing sheet 1. No projecting part 4 is provided on a portion corresponding to the welding margin 5, and this portion is flat. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a foam cushioning sheet used when packing an object to be packed that is easily damaged by impact, and more specifically, improvement in variation in welding strength of welded portions when welding the foam cushioning sheets together. About. The present invention also relates to a buffer bag made from a cellular cushion sheet having improved weld strength variation in the welded portion.

  Conventionally, when transporting articles that are easily damaged by impacts, etc., they are packed using a foam cushioning sheet (what is called an air cap) formed of polyethylene or the like, and the impact on the object to be packed is reduced. This prevents the destruction of the packaged items.

  When packing an item to be packed using a foam cushioning sheet, two foam cushion sheets are overlapped and all edges except the open edge are sealed by a method such as heat sealing, or the foam cushion sheet is folded. After that, all the edges except for the open edge are sealed by a method such as heat fusion, and the foamed cushioning sheet is made into a bag shape, and then the packing object is put in the bag and packed. .

  For this reason, for example, in Patent Document 1, the embossed film (same as the cap film) on which a large number of convex protrusions are formed and the embossed film are bonded to the surface where the convex protrusions are not formed. A cellular cushioning sheet comprising a planar base film forming convex closed cells and a planar top film bonded to the top surface of the convex protrusions of the embossed film comprises (1) thickness, (2 A cellular cushioning sheet having bag-forming properties by having certain characteristics with respect to the size of the convex protrusions, (3) weight, (4) heat resistance, (5) folding strength, and (6) hardness. It is proposed that

  However, in the conventional foam cushion sheet, even if it is the foam cushion sheet disclosed in Patent Document 1, for example, two foam cushion sheets are overlapped and their ends are welded into a bag shape. In some cases, the welded portion was often torn. And many such tears generate | occur | produced especially in the position with the convex part in which the air of a foam cushion sheet is contained.

For this reason, at the position where the convex portion of the cellular cushion sheet is located, the convex portion containing air hinders the welding, and the welding strength varies at that portion, resulting in tearing of the produced bag, etc. It was considered.
Japanese Patent Laid-Open No. 2003-80619

  In view of the above problems, the present invention has variations in the welding strength at the welding position when a plurality of cellular cushion sheets are overlapped, or when one cellular cushion sheet is folded and then stacked to form a bag. It is to provide a cellular cushion sheet that can produce a bag that is not easily torn. Another object of the present invention is to provide a buffer bag which is formed of the above-mentioned cellular cushion sheet and is not easily torn.

  In order to achieve the above object, the present invention provides a foam cushion sheet in which a cap film provided with a plurality of convex portions and a flat base film are bonded together to form a large number of closed closed cells. The flat welding margin which does not have the said closed cell is provided in the one part area | region of this.

  Further, the present invention is characterized in that, in the cellular cushion sheet having the above-described configuration, the partial area is the entire peripheral area of the outer peripheral part of the sheet or a part of the outer peripheral part.

  Moreover, the present invention is characterized in that, in the cellular cushion sheet having the above-described configuration, the partial area is provided in a lattice shape in the sheet.

  Further, the present invention is characterized in that, in the cellular cushion sheet having the above-described configuration, the welding margin is provided by processing a portion where the closed cells are formed flat.

  Further, the present invention is characterized in that it is a buffer bag formed into a bag shape by welding the welding margins using the cellular buffer sheet having the above-described configuration.

  According to the first configuration of the present invention, since a flat welding margin is provided inside the foam cushioning sheet, the weld margin is used when producing a buffer bag using the foam cushioning sheet. In addition, if the foamed buffer sheets are welded together, it is possible to prevent the welding strength of the welded portion from varying.

  Further, according to the second configuration of the present invention, in the cellular cushion sheet of the first configuration, since the welding margin is provided on the outer peripheral portion of the cellular cushion sheet, the cellular cushion sheet is 2 It is possible to make a buffer bag by stacking the sheets or by bending one of the cellular buffer sheets and welding them together.

  Further, according to the third configuration of the present invention, in the cellular cushion sheet of the first configuration, the cellular cushion sheet is cut at the welding margin portions provided in a lattice shape, thereby welding to the outer peripheral portion. It is possible to obtain various sizes of cellular cushion sheets having margins. For this reason, it becomes possible to easily produce buffer bags of various sizes with stable welding strength with the cut cellular foam buffer sheet.

  According to the fourth configuration of the present invention, in the cellular cushion sheet having the first to third configurations, the flat welding margin is formed after the cap film and the base film are bonded together. For this reason, the welding margin can be easily provided at a free position of the cellular cushion sheet.

  Further, according to the fifth configuration of the present invention, the cushioning bag is formed by laminating the flat welding margins of the cellular cushioning sheet using the cellular cushioning sheets of the first to fourth configurations. For this reason, the welded portion is firmly attached and the welded portion is broken, so that, for example, there is no possibility that an object to be packed is scattered or damaged.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not the meaning limited to the form demonstrated here.

  FIG. 1 is a perspective view of a foam cushioning sheet 1 according to the first embodiment. FIG. 2 is a cross-sectional view of the cellular cushion sheet 1 according to the first embodiment taken along the line a-a ′ of FIG. 1. As shown in FIG. 2, the cellular cushion sheet 1 includes a cap film 2 having a plurality of convex portions 4 formed on the upper surface and a flat base film 3 on the lower surface. 3 is bonded.

  The cap film 2 and the base film 3 are bonded together by a known method. For example, the cap film 2 and the base film 3 are bonded together by a method such as heat fusion using a pressure roll or the like. Moreover, the convex part 4 of the cap film 2 is formed by a well-known method, for example, the cap film 2 before the convex part 4 is formed is wound on a mold having a plurality of concave parts and sucked under vacuum. Etc. are formed.

  As a material of the cap film 2 and the base film 3, for example, low density polyethylene is used. However, it is not intended to be limited to low-density polyethylene, and it is preferable to use a polymer that can be formed into a film with a thermoplastic resin. Examples thereof include polyolefin, polyamide, polyimide, polyester, and polyvinyl chloride. In particular, examples of polyolefin include high-density polyethylene and polypropylene in addition to low-density polyethylene.

  In the foam cushioning sheet 1 of the first embodiment, as shown in FIG. 1, a welding margin 5 is provided on the entire circumference of the outer periphery of the foam cushioning sheet 1. The convex portion 4 is not provided in the portion corresponding to the welding margin 5, and this portion is flat. For this reason, when the welding margins 5 are welded to each other, the welding does not become insufficient due to being disturbed by the convex portion 4 containing air, as in the case where the convex portion 4 is sandwiched and welded. The weld strength of the welded portion does not vary.

  The width of the welding margin 5 is not particularly limited as long as it can function as a welding margin when a bag is produced using the cellular cushion sheet 1. However, if the width is made too wide, the ratio of closed cells that exhibit a buffering effect is reduced, so it is preferable not to make the width of the welding margin 5 too wide. Moreover, about the foam cushion sheet 1 of 1st Embodiment, although the welding margin 5 is provided in the perimeter of a sheet | seat, it does not necessarily need to provide in a perimeter, for example, it welds only to 2 sides or only 3 sides. You may comprise so that the margin 5 may be provided.

  The flat welding margin 5 can be produced, for example, at the production stage of the cap film 2 on which the plurality of convex portions 4 are formed. That is, for example, if a portion where the welding margin 5 is to be made in advance is filled with a concave portion of the mold, or a portion which is to be the welding margin 5 is prepared with a mold not provided with a concave portion, etc. Even when sucked, the portion where the welding margin 5 is desired can be kept flat. For this reason, when the cap film 2 and the base film 3 are pasted together into a sheet shape, the cellular cushion sheet 1 provided with the flat welding margin 5 can be produced.

  In addition, the production method of the flat welding margin 5 is not limited to the method of production at the production stage of the cap film 2, and can be changed without departing from the object of the present invention. For example, after bonding the cap film 2 and the base film 3, it is possible to provide the welding margin 5 by processing the convex portions 4 which are a plurality of closed cells formed on the cap film 2 to be flat. . Examples of a method for flatly processing the convex portions 4 formed on the foam cushioning sheet 1 include a method of hot pressing with a flat plate, a method of pressing with a hot roller, and the like.

  When the cap film 2 and the base film 3 are bonded to each other, and a part of the bonded sheet is processed to be flat, a portion to be welded after the cellular cushion sheet 1 is cut into a desired size This is convenient in that the welding margin 5 can be provided freely.

  Next, the foam cushion sheet 1 according to the second embodiment will be described. FIG. 3 is a perspective view of the foam cushioning sheet 1 according to the second embodiment. In the present embodiment, the welding margins 5 are provided in the foam cushion sheet 1 in a lattice shape. As with the case of the first embodiment, the welding margin 5 may be produced at the production stage of the cap film 2, or after the cap film 2 and the base film 3 are bonded together, a heat roller or the like is used. You may make it produce by processing flat using.

  When the welding margin 5 is produced in a lattice shape in the cellular cushion sheet 1 as in the second embodiment, for example, the cellular cushion sheet 1 is cut along the welding margin 5 and buffered using the separated sheet. Can be formed into sex bags. In this case, each cut sheet has a welding margin 5 on its outer peripheral portion. Therefore, if the welding is performed with the welding margin 5, a bag that does not vary in welding strength and is not easily torn is produced. it can.

  In addition, about the width | variety of the grid-like welding margin 5 provided in the foam cushion sheet 1, it cut | disconnects considering that the foam cushion sheet 1 is cut and used along the weld margin 5 as mentioned above. A width that can secure a space that can be sufficiently welded later is preferable. Further, the form of the lattice is not limited to the form shown in the second embodiment. For example, in FIG. 3, a form in which the welding margin 4 is provided also on the upper and lower sides of the outer peripheral portion may be used. Sheets of various sizes may be cut out by widening or narrowing the interval.

  Next, FIG. 4 shows a third embodiment of the buffer bag 7 produced using the cellular cushion sheet 1 shown in the first embodiment or the second embodiment. Here, Fig.4 (a) has shown the structure at the time of bonding two foam cushion sheets 1 and making it into a bag shape. On the other hand, FIG.4 (b) has shown the case where the one foam cushion sheet 1 is bend | folded and formed in the bag shape. 4A and 4B, the buffer bag 6 is formed so that the convex portion 4 (see FIG. 2) of the cap film 2 faces inward.

  When two foam cushion sheets 1 are overlapped as shown in FIG. 4 (a), the weld margins 5 of the foam cushion sheets 1 formed in the same size are overlapped with each other and the weld margins 5 are overlapped. For example, heat sealing. Thereby, as shown in FIG. 6, since only the flat welding margin 5 can be used to bond the foam cushion sheets 1 to each other, the breakage of the buffer bag 6 caused by insufficient welding of the welded portion is prevented. Almost disappear. FIG. 5 is an enlarged view of a portion surrounded by a circle S in FIG. 4A in the cross-sectional view of the buffer bag 6 taken along b-b 'in FIG.

  When forming the bag by stacking the foam cushioning sheet 1, an opening for inserting an object to be packed is required. Therefore, as shown in FIG. 4 (a), the upper part of the cushioning bag 6 is not welded. The both sides and the lower part of the buffer bag 6 are welded. For this reason, when producing the buffer bag 7 using the foam cushioning sheet 1, the part which becomes an opening part when the bag is formed in the foam cushion sheet 1 is not provided with the welding margin 5 from the beginning. You may comprise. FIG. 4A shows a case in which the buffer bag 7 is manufactured using the foam cushioning sheet 1 in which the welding margin 6 is not provided in the opening portion.

  When a single foam cushion sheet 1 is folded to form a bag, for example, the foam cushion sheet 1 is folded in half as shown in FIG. For example, the buffer bag 6 is obtained by heat-sealing. In this case, since the welding margin 5 is flat, the welding strength does not vary, and the possibility of the buffer bag 6 being broken is low.

  Further, as in the case described above, the opening portion of the foam cushioning sheet 1 may not be provided with the welding margin 5 from the beginning. In FIG. The case where the buffer bag 6 is produced using the foamable buffer sheet 1 in which the welding allowance 5 is not provided in the part to be formed is shown.

  In addition, in 3rd Embodiment, although the buffer bag 6 formed so that the convex part 4 of the foam cushion sheet 1 might become inside, the buffer bag 6 of this invention is not the meaning limited to this. Moreover, the buffer bag 6 formed so that the convex part 4 of the foam cushion sheet 1 may be on the outside may be used.

  Moreover, in the above 1st to 3rd embodiment, although the convex part 4 of the foam cushioning sheet 1 showed a cylindrical thing, the shape and magnitude | size of the convex part 4 are limited to these embodiments. For example, a polygonal prism such as a quadrangular prism or a triangular prism, a polygonal pyramid such as a quadrangular pyramid or a triangular pyramid, an egg shape, or a heart shape may be used. Furthermore, the shape of the foam cushioning sheet 1 is not necessarily square, and can be various shapes such as a circle and a triangle.

  In the present invention, in a foam cushioning sheet formed by laminating a cap film having a large number of closed cells on one side of a base film, a flat weld that does not have closed cells in a part of the area of the sheet. Is provided.

  According to this, it can be welded using a flat welding margin when the cellular buffer sheets are bonded together. For this reason, as in the conventional case, when a bag is produced by laminating the foam cushion sheets, the convex portions formed by the closed cells of the foam cushion sheet hinder the welding, and the welding strength varies. Can be prevented.

  In addition, if a welding margin is provided on the outer periphery of the foam cushioning sheet, two sheets of the foam cushioning sheet are overlapped, or one sheet is folded and stacked, and then welded with the overlapped welding margin. Then, it is possible to easily produce a buffer bag that does not vary in welding strength and is not easily torn.

  In addition, when the welding margin is provided in a lattice shape in the foam cushioning sheet, the foam cushion sheet can be cut and used in accordance with the size of the object to be packed.

  In addition, when making a bag by laminating two foam cushion sheets of the present invention or folding one foam cushion sheet, there is no variation in the welding strength of the welded part, There is little risk of tearing the bag containing the items to be packed.

These are perspective views of the foam cushion sheet of a 1st embodiment. FIG. 2 is a cross-sectional view taken along the line a-a ′ in FIG. 1 for the cellular cushion sheet of the first embodiment. These are perspective views of the foam cushion sheet of a 2nd embodiment. These are the perspective views of the buffer bag produced using the foamable buffer sheet of this invention. These are the expanded views which expanded a part about sectional drawing of the buffer bag of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cellular buffer sheet 2 Cap film 3 Base film 4 Convex part 5 Welding margin 6 Buffer bag

Claims (5)

In a cellular cushion sheet that forms a large number of closed closed cells by laminating a cap film provided with a plurality of convex portions and a flat base film,
A foam cushioning sheet characterized in that a flat welding margin having no closed cells is provided in a partial region in the sheet.   2. The foam cushion sheet according to claim 1, wherein the partial region is the entire peripheral region of the outer peripheral portion of the sheet or a part of the outer peripheral portion.   The cellular cushion sheet according to claim 1, wherein the partial area is provided in a lattice pattern in the sheet.   The foaming buffer sheet according to any one of claims 1 to 3, wherein the welding margin is provided by processing the portion where the closed cells are formed flat.   A buffer bag, which is formed into a bag shape by welding the welding margins using the cellular cushion sheet according to any one of claims 1 to 4.

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