JP2013173553A - Air cushioning material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an air cushioning material capable of suppressing generation of a wrinkle in an end of a welding part for folding when folding an expanded expansion part along the welding part for holding.SOLUTION: A flat air cushioning material 101 with two thin film members bonded includes a plurality of welding parts 143 for cross partitioning formed by welding the two thin film members so that a plurality of expansion parts are formed in a length direction of the thin film members, and a welding parts 150 and 160 for folding for forming the two thin film members by welding in a length direction thereof so that each expansion part can be foldable by being divided into three division expansion parts 111-113 and division communication passages 191 and 192 for communicating the adjoining division expansion parts are regulated. The welding parts for folding includes a pair of projection parts 151 and 161 projecting so as to be opposed to each other from the adjoining cross partitioning welding part 60 as a welding part for passage regulating the division communication passage, and tips 151a and 161a of the projection parts are formed with a round shape.

Description

  The present invention relates to an air cushioning material, and more particularly to a flat air cushioning material having a structure in which two airtight films are bonded so that a plurality of inflatable portions are formed by blowing air, against external force such as impact or vibration. It relates to the improvement of strength.

  When placing an article such as a video deck or television receiver in a packaging container such as cardboard, a cushioning material such as polystyrene foam is generally packed in the gap, but the cushioning material made of polystyrene foam must be molded to match the shape of the article. Such a cushioning material has a problem that it is expensive to manufacture and is bulky at the time of disposal because of its inherent volume.

  Further, Patent Document 1 discloses an air cushioning material in which air is enclosed. However, the air cushioning material has already been encapsulated with air in a produced state, and has a problem that it is bulky during transportation.

  On the other hand, Patent Document 2 includes a self-sealing blow tube as an improved buffer material having a specific volume in such a produced state, and a plurality of expansions that absorb external impacts by blowing air. A flat air cushioning material (hereinafter also referred to as an air bag) configured to form a portion is disclosed.

  FIG. 8 is a view for explaining the airbag disclosed in Patent Document 2. FIG. 8 (a) shows a flat state before the air is introduced into the airbag, and FIG. 8 (b) shows an inflating. Fig. 8 (c) is an enlarged view of a part of the airbag in a state in which the air bag is bent (Fig. 8 (a)). Fig. 8 (c) is a diagram illustrating the flat airbag shown in Fig. 8 (a) inflated by air injection and bent. Shows the state.

  FIG. 9 is a view for explaining a self-sealing blow tube used in the airbag shown in FIG. 8, and FIG. 9 (a) shows the cross-sectional structure of the AA line portion of FIG. 8 (a). The back is shown in a slightly swollen state, and FIG. 9 (b) shows an enlarged view of the self-sealing blow tube shown in FIG. 9 (a).

  The airbag 200 is formed with a plurality of portions (inflatable portions) 7 in which two films (thin film members) having a constant width, that is, the front-side film 1 and the back-side film 2 are partitioned into an airtight state that is inflated by blowing air. The two films 1 and 2 are welded by heat sealing (thermal fusion) at both side edges 3 and 4 thereof.

  Here, a self-sealing blow tube 10 is attached to one side edge 3 of the airbag 200, and one of the self-sealing blow tube 10 along its longitudinal direction (the film length direction) Dx. These side edges are sandwiched between the two films 1 and 2 and welded together with the side edges 3 of these films 1 and 2.

  In addition, the airbag 200 has a pair of linear welds that cross between the one side edge 3 and the other side edge 4, and the transverse partition parts 5 and 6 that partition the adjacent inflating parts 7. It is formed as.

  Further, as shown in FIG. 8 (c), each inflatable portion 7 is formed so that the inflatable portion 7 can be folded into a U-shape in a plane perpendicular to the longitudinal direction Dx of the airbag 200. Linear sealing portions are formed as bending seal portions 8a and 8b at portions corresponding to the two corners of the U-shape, and each expansion portion 7 includes first to third divided expansion portions. 7a to 7c.

  Here, the three divided inflating portions 7a to 7c in one inflating portion 7 are connected so that adjacent ones can circulate air, and specifically, the first divided inflating portion 7a and the first The second section expansion portion 7b is an air flow passage (section communication passage) that is a gap between both end portions of the folding seal portion 8a that partitions them and the transverse partition portions 5 and 6 that are close to these end portions. 9, and the second divided expansion portion 7 b and the third divided expansion portion 7 c are divided into both end portions of a folding seal portion 8 b that partitions them, and a transverse partition portion adjacent to these end portions. The air flow passage (section communication passage) 9 which is a gap between 5 and 6 communicates.

  And air is blown into the 1st division | segmentation expansion part 7a of each expansion | swelling part 7 via the self-sealing type blowing tube 10. As shown in FIG.

  Various types of self-sealing blow tube 10 have been developed. Here, the type having a plurality of parallel paths disclosed in Patent Document 3 will be briefly described.

  That is, as shown in FIGS. 8A and 9B, the self-sealing blow tube 10 includes two strip-like films 10a and 10b that are first to fourth air along the length direction. The passages 11, 20, 21, and 22 are bonded together so as to be formed in order from one side edge side (the left side of the paper in FIG. 9B), and the self-sealing blow tube 10 The near first air passage 11 and the second air passage 20 adjacent to the first air passage 11 are separated by a first intermittent seal portion 12 formed therebetween, and the first intermittent seal portion 12 includes The non-seal part (self-sealing type opening) 13 which connects the 1st air passage (penetration blow-in passage) 11 and the 2nd air passage (partition passage) 20 is formed at predetermined intervals.

  Similarly, the second air passage 20 and the third air passage (partition passage) 21 adjacent to the second air passage 20 are divided by a second intermittent seal portion 14 formed therebetween, and the third air passage is formed. 21 and a fourth air passage (partition passage) 22 adjacent thereto are divided by a third intermittent seal portion 16 formed therebetween. Here, in the second intermittent seal portion 14, non-seal portions (self-sealing openings) 15 that communicate the second air passage 20 and the third air passage 21 are formed at a predetermined interval. In the intermittent seal portion 16, non-seal portions (self-sealing openings) 17 that communicate the third air passage 21 and the fourth air passage 22 are formed at predetermined intervals. Further, a fourth intermittent seal portion 18 is formed on the other side edge of the self-sealing blow tube 10, and a fourth air passage 22 is provided in the fourth intermittent seal portion 18. Non-sealing portions (self-sealing openings) 19 are formed at a predetermined interval so as to be connected to the first section expansion portion 7a in each expansion portion 7.

  Here, the self-sealing openings 13, 15, 17, and 19 in the intermittent seal portions 12, 14, 16, and 18 are arranged so that the positions in the longitudinal direction Dx are shifted from each other so that air does not leak from the self-sealing blow tube 10. The self-sealing opening has a structure having a reverse valve.

  In the airbag 200 incorporating the self-sealing blow tube 10 having such a configuration, the first air passage (through blow passage) 11 passes through the first section inflating portion 7a of each inflating portion 7 of the airbag 200. Although it has a structure, the second to fourth air passages (partition passages) 11, 20, 21, 22 are divided by the transverse partition portions 5 and 6 for each first section inflating portion 7 a of each inflating portion 7. It has become a dead end passage.

  This is, for example, sandwiching the self-sealing blow tube 10 formed with the first, second, third, and fourth intermittent seals 12, 14, 16, and 18 between the front film 1 and the back film 2, When the transverse partition parts 5 and 6 are formed on these films 1 and 2 by heat sealing (thermal fusion), a non-heat-adhesive paint is applied only to the inner surface of the tube 10 corresponding to the first air passage 11; It can be realized by previously applying printing ink, lacquer or the like.

  In such an air bag 200, when air is blown from the opening end of the self-sealing blow tube 10 by an air compressor or the like, the air sequentially pushes and opens the self-sealing openings 13, 15, 17, and 19 of each inflatable portion 7. Is blown into the first section expansion section 7a of the expansion section 7 through the gas-type opening 19, and further to the second and third section expansion sections 7b and 7c via the air flow passage 9 beside the folding seal sections 8a and 8b. It flows in and each section expansion part is expanded.

  When the inflating portion 7 of the airbag 200 is inflated to the required limit, the air blowing is stopped, and the self-sealing blowing tube 10 is compressed by the air pressure in the inflating portion, and all of the self-sealing openings 19, 17, 15, 13 are The partition passages 22, 21, 20 and the through-blowing passage 11 are crushed and in close contact with each other. Thereby, each expansion part 7 maintains expansion | swelling and plays the role of a buffer or packaging.

  As shown in FIG. 8C, the inflated airbag 200 can be freely folded at the place where the folding seal portions 8a and 8b are formed, and is attached to both sides of a flat rectangular parallelepiped product V. Then (FIG. 10A), the product V is accommodated in the packaging cardboard box P (FIG. 10B).

  In this state, even when an external force is applied from the outside of the cardboard box P or the product V is dropped, the impact can be absorbed by the airbag 200 and the product V can be protected.

  Also, unlike conventional cushioning materials made of foamed polystyrene, etc., which have a solid volume from the beginning, in the type of airbag that is inflated by air injection, the size and shape of the gap between the product and the cardboard box are adjusted. It is also convenient to be able to fill this gap by deforming.

  In addition, the sheet-like cushioning material used as the material member of the airbag 200 is, for example, heat that performs thermocompression bonding on a moving path that moves the two thin film members 1 and 2 from the sending side toward the winding side. A crimping device is arranged, and these two thin film members 1 and 2 can be easily formed by repeatedly thermocompressing them from above and below by a pair of upper and lower molds of a thermocompression bonding device at a constant pitch. Moreover, as a thermocompression bonding apparatus for creating such a sheet-like cushioning material from two thin film members, the two thin film members are passed between a pair of upper and lower rotating rollers, and a predetermined location of the two thin film members A sheet-like cushioning material can be created by welding. In this case, it is necessary to form a heating protrusion having a pattern corresponding to the pattern of the welded region of the sheet-like cushioning material on the surface of the rotating roller. Moreover, the sheet-like cushioning material as described above can also be created by welding predetermined portions of the two thin film members with a heat seal (heat fusion) apparatus having a variable heat seal blade that can move laterally. In this heat sealing apparatus, the dimension of the section expansion part of the air bag to be created can be easily changed by changing the position of the variable heat sealing blade.

  Further, in the airbag 200 disclosed in Patent Document 2, the airflow passage (section communication passage) between the folding seal portion capable of bending the expansion portion 7 and the transverse partition portion adjacent thereto is adjacent. Although the structure which connects a division | segmentation expansion part is connected, the structure which connects between the division expansion parts which adjoin in one expansion part is not limited to this.

  FIG. 11 is a view for explaining another conventional airbag having a different structure of the air flow passage (section communication passage) from the airbag disclosed in Patent Document 2, and FIG. 11 (a) shows the air of the airbag. Fig. 11 (b) shows a part of the air flow passage (section communication passage) when the air bag is inflated (a portion equivalent to portion E in Fig. 11 (a)). FIG. 11C shows a state where the airbag shown in FIG. 11A is inflated and bent by injecting air.

  As in the airbag 200 shown in FIG. 8, this airbag 300 is a portion (inflatable portion) 30 in which two films (thin film members) 1 and 2 having a constant width are partitioned into an airtight state that is expanded by blowing air. The two films are welded by heat sealing at both side edges 41 and 42, and one side edge 41 of the airbag 300 is attached to the side edge 41 of FIG. A self-sealing blow tube 10 identical to that shown in FIGS. 8 (a) and 9 (b) is mounted.

  Further, in the airbag 300, a belt-like welded portion that crosses between one side edge portion 41 and the other side edge portion 42 is formed as a transverse partition portion 43 that partitions adjacent inflatable portions 30. Furthermore, each welded portion 30 has two welded portions serving as folds in the first and second folds so that the inflatable portion 30 can be folded in a plane perpendicular to the longitudinal direction Dx of the airbag 300. It forms as the seal parts 51 and 52 for each, and each expansion part 30 is divided into the 1st-3rd three division expansion parts 31-33.

  Here, as for the three division expansion parts 31-33 in the one expansion part 30, the adjacent things are connected so that the distribution | circulation of air becomes possible.

  Specifically, the first section expansion section 31 and the second section expansion section 32 communicate with each other through an air flow passage (section communication path) 53 formed in the first folding seal section 51 that partitions them. Moreover, the 2nd division expansion part 32 and the 3rd division expansion part 33 are connected by the air flow path (section communication path) 54 formed in the sealing part 52 for bending which partitions these. That is, the first folding seal part 51 has a pair of rectangular protrusions 51a protruding from the adjacent transverse partition parts 43 so as to face each other, and a portion between the pair of protrusions 51a is air flow. Road 53 is formed. The second bending seal part 52 has a pair of rectangular protrusions 52a protruding so as to face each other from the adjacent transverse partition parts 43, and a portion between the pair of protrusions 52a is an air flow passage 54. It has become.

  Then, air is blown into the first section expansion portion 31 of each expansion portion 30 via the self-sealing blow tube 10.

  Also in the airbag 300 having such a configuration, when the air is blown from the opening end of the self-sealing blow tube 10, the respective divided inflating portions 31 to 33 of each inflating portion 30 are inflated, and further, the inflating portion 30 is required. When the air blowing is stopped at the limit, the self-sealing openings 19, 17, 15, 13 of the self-sealing blowing tube 10 are closed.

  Like the airbag 200 described in FIG. 10, the airbag 300 inflated in this way is attached to the product by folding each of the inflatable portions 30 with the folding seal portions 51 and 52. Be contained. In this state, even when an external force is applied from the outside of the cardboard box or the product is dropped, the impact can be absorbed by the airbag 300, and the product can be protected.

  As described above, in the conventional airbag 200 or 300, even after inflating, the inflating part can be bent arbitrarily without difficulty, and air blowing into the section inflating part of each inflating part It is performed through an air flow passage (section communication passage) formed in a portion to be bent, and air can be injected into the airbag once. Further, the airbag can flexibly cope with changes in dimensions and shape of the article to be packaged by deformation of the inflated portion.

JP-A-5-4660 Japanese Patent No. 2591882 JP-A-4-215978

  However, in the conventional airbags 200 and 300 described above, both of the portions adjacent to the corners of the folding seal portion for bending the inflatable portion, that is, the portion adjacent to the welded portion defining the section communication path can be wrinkled. There exists a problem that the intensity | strength of the airtight film which comprises an airbag falls by wrinkles.

  For example, in the airbag 200 shown in FIG. 8, when each inflatable portion 7 is inflated by blowing air, as shown in FIG. 8B, the belt-like folding seal portion that is welded and remains flat The end of 8b is surrounded by a portion (a portion adjacent to the folding seal portion 8b in the divided expansion portions 7b and 7c) in which the two films 1 and 2 bonded together swell to form a three-dimensional shape. Thus, the wrinkles W1 are generated due to the concentration of distortion at this end.

  Further, the wrinkle W1 is formed by bending the expansion portion 7 with a folding seal portion 8a between the adjacent segment expansion portions 7a and 7b and a bending seal portion 8b between the adjacent segment expansion portions 7b and 7c. Furthermore, the distortion of the end portions of the folding seal portions 8a and 8b increases, resulting in larger wrinkles.

  When such a wrinkled airbag is housed in a cardboard box together with the product and transported, the films rub against each other at the wrinkled portion due to vibration and impact during transportation, and the strength of the film deteriorates.

  Therefore, when the air bag is inflated, wrinkles W1 can be formed on the airtight film constituting the air bag, resulting in a decrease in the strength of the film in the vicinity of the wrinkle. When a large force is applied to the air bag, the wrinkled portion In particular, there is a drawback in that the cushioning performance is impaired due to breakage from a portion where large wrinkles are formed due to bending of the inflatable portion 7.

  Also, the airbag 300 shown in FIG. 11 has the same problem as the airbag shown in FIG. 8, for example, as shown in FIG. 11 (b), which is sealed and remains flat. The protruding portion 51a of the seal portion 51 is a portion where the two bonded films 1 and 2 swell to form a three-dimensional shape (specifically, a portion adjacent to the protruding portion 51a in the divided expanding portions 31 and 32). ) And the wrinkle W2 is generated due to the concentration of distortion at the tip of the rectangular protrusion 51a. In addition, the wrinkle W2 has a large distortion at the end portions 51a and 52a of the folding seal portions 51 and 52 by folding the expansion portion with the folding seal portions 51 and 52 between the adjacent divided expansion portions. Thus, a large wrinkle LW (see FIG. 11C) is obtained.

  As described above, in the airbag in which the inflatable portion can be bent with the folding seal portion as a boundary after being inflated, when the flat airbag is inflated, the wrinkles W1 and W2 are formed on the films 1 and 2 constituting the airbag. In particular, a large wrinkle LW is offset near the end of the folded seal part in the folded inflated part, the strength of the film near the wrinkle is reduced, and when a large force is applied to the airbag, the wrinkled part, In particular, there is a drawback in that the cushioning performance is impaired due to breakage from a portion where large wrinkles are formed due to bending of the inflatable portion 30.

  The present invention has been made in order to solve the above-described problems, and when the expanded portion that has been expanded is folded at the folding weld portion, wrinkles occur at the end of the folding weld portion. An object of the present invention is to obtain an air cushioning material that can suppress the decrease in strength of the hermetic thin film member that is a constituent material.

  In the air cushioning material according to the present invention, at least two thin film members having a predetermined width having airtightness are bonded so as to form a plurality of inflatable portions that absorb an impact on an article to be packed by blowing air. A flat air cushioning material, wherein the thin film member is formed with a partition welding portion that partitions adjacent expansion portions, and the partition welding portion is a passage welding portion that defines an air flow passage in the expansion portion. And the welded portion for passage so that the concentration of stress generated in the portion of the thin film member adjacent to the airflow passage and the welded portion for passage is reduced when the expanded portion is formed. The side edge facing the air flow passage is a rounded shape, a curved shape, or a plurality of line segments, and a polygonal line shape with an obtuse angle formed by adjacent line segments. This achieves the above object.

  In the air cushioning material according to the present invention, the partition welded portion may be formed at a plurality of locations in the length direction of the thin film member such that the plurality of inflatable portions are continuously formed in the length direction of the thin film member. A plurality of transverse partition welded portions formed by linear welding along the width direction, and each of the plurality of inflatable portions can be bent by being divided into a plurality of sectioned inflatable portions, and as the air flow passage A bending weld formed by welding the thin film member along its length so as to define a section communication passage for communicating adjacent section expansion portions, and the passage weld section includes It is an end of the welding part for bending that faces the section communication passage, and the side edge of the end is preferably rounded.

  In the air cushioning material according to the present invention, the folding welded portion includes a pair of projecting portions projecting so as to face each other from the adjacent transverse partition welded portions as the welded portion for the passage. It is preferable that a segment communication path that communicates the segment expansion portions located on both sides of the bending weld portion is formed between the protruding portions.

  In the air cushioning material according to the present invention, the bending weld portion is formed between the adjacent transverse partition weld portions, and both end portions of the bending weld portion are the passage weld portions, Between one end portion of the welding portion for bending and the transverse partition weld portion facing this, and between the other end portion of the welding portion for bending and the transverse partition weld portion facing this, It is preferable that a segment communication passage that communicates the segment expansion portions located on both sides of the welding portion for bending is formed.

  In the air cushioning material according to the present invention, the partition welded portion may be formed at a plurality of locations in the length direction of the thin film member such that the plurality of inflatable portions are continuously formed in the length direction of the thin film member. A plurality of transverse partition welded portions formed by linear welding along the width direction, and each of the plurality of inflatable portions can be bent by being divided into a plurality of sectioned inflatable portions, and as the air flow passage A bending weld formed by welding the thin film member so as to form a section communication passage that connects adjacent section expanding sections, and the bending welding section expands from the transverse partition weld section. It is preferable that a protruding portion that protrudes toward the portion side to define the divided communication passage is included as the welding portion for the passage, and a side edge of the protruding portion of the bending welding portion has a smooth curved shape.

  In the air cushioning material according to the present invention, the partition welded portion may be formed at a plurality of locations in the length direction of the thin film member such that the plurality of inflatable portions are continuously formed in the length direction of the thin film member. A plurality of transverse partition welded portions formed by linear welding along the width direction, and each of the plurality of inflatable portions can be bent by being divided into a plurality of sectioned inflatable portions, and as the air flow passage A bending weld formed by welding the thin film member along its length so as to define a section communication passage for communicating adjacent section expansion portions, and the passage weld section includes It is preferable that it is an edge part which opposes this division | segmentation communicating path of the welding part for bending, and the side edge of this edge part becomes the shape which chamfered the corner | angular part of this edge part so that it may become the said broken line shape.

  In the air cushioning material according to the present invention, the partition welded portion may be formed at a plurality of locations in the length direction of the thin film member such that the plurality of inflatable portions are continuously formed in the length direction of the thin film member. A plurality of transverse partition welded portions formed by linear welding along the width direction, and each of the plurality of inflatable portions can be bent by being divided into a plurality of sectioned inflatable portions, and as the air flow passage A bending weld formed by welding the thin film member so as to form a section communication passage that connects adjacent section expanding sections, and the bending welding section expands from the transverse partition weld section. It is preferable that a protruding portion that protrudes toward the portion side to define the section communication passage is included as the welding portion for the passage, and a side edge of the protruding portion of the bending welding portion is formed in the shape of the broken line.

  The present invention provides the air cushioning material according to the present invention, further comprising an air inlet for injecting air into the expansion portion, and the air injection port is provided with a reverse support valve for preventing outflow of air injected into the expansion portion. It is preferable that

  Next, the operation will be described.

  In the present invention, a flat air buffer in which at least two thin film members having a predetermined width having airtightness are bonded so as to form a plurality of inflating portions that absorb impacts on the article to be packed by blowing air. In the material, the partition welding portion that partitions adjacent expansion portions in the thin film member has a passage welding portion that defines an air flow passage in the expansion portion, and the thin film member is formed when the expansion portion is formed. The side edge of the welded portion for the passage facing the airflow passage is rounded so that the concentration of stress generated in the portion where the airflow passage and the welded portion for the passage are adjacent to each other is alleviated. Since it is a polygonal line shape that consists of a shape, a curved line shape, or a plurality of line segments, and the angle between adjacent line segments is an obtuse angle, the welded part for a passage that remains flat even when air is blown in, and this Welding for passage Concentration of the blowing air which is adjacent to the passage side edge of the stress produced between the portion to be a three-dimensional shape is relaxed.

  That is, the boundary between the welded portion for the passage that remains flat even when air is blown and the portion that becomes a three-dimensional shape by blowing air adjacent to the passage-side edge of the welded portion for the passage is smoother. Alternatively, the stress concentration at the boundary can be relaxed by using a curved line. Thereby, it can suppress that a wrinkle generate | occur | produces in the part which contact | connects the welding part for a channel | path of a thin film member, and can suppress the strength reduction by the wrinkle of a thin film member.

  Further, in the present invention, in the air cushioning material, the plurality of transverse partition weld portions that partition the partition weld portion so that the thin film member is continuously formed in the length direction of the thin film member. Each of the inflatable portions is divided into a plurality of segmented inflatable portions, which can be bent, and is formed in the thin film member so as to define a segment communication passage that is an air flow passage for communicating adjacent segment inflatable portions. Since the side edge of the welded portion for the passage, which is the end of the welded portion for bending that faces the sectioned continuous passage, has a rounded shape, the segmented continuous portion that swells by blowing air in the thin film member. It is possible to suppress the generation of wrinkles in the portion adjacent to the welding portion for bending, which has a flat shape even when air is blown into the passage. As a result, it is possible to suppress the occurrence of wrinkles at the ends of the welded portion for bending when the expanded expanded portion is folded with the welded portion for bending as a boundary, thereby reducing the strength of the cushioning material. Can be suppressed.

  Further, in the present invention, in the air cushioning material, the plurality of transverse partition weld portions that partition the partition weld portion so that the thin film member is continuously formed in the length direction of the thin film member. Each of the inflatable portions is divided into a plurality of segmented inflatable portions, which can be bent, and is formed in the thin film member so as to define a segment communication passage that is an air flow passage for communicating adjacent segment inflatable portions. In the thin film member, the side edge of the protruding portion that defines the section communication path is formed in a smooth curved shape by protruding from the transverse partition welding portion to the expansion portion side of the welding portion for bending. In addition, it is possible to suppress the generation of wrinkles in the portion adjacent to the protruding portion where the section communication passage that expands by blowing air remains flat even when air is blown. As a result, it is possible to suppress the occurrence of wrinkles at the ends of the welded portion for bending when the expanded expanded portion is folded with the welded portion for bending as a boundary, thereby reducing the strength of the cushioning material. Can be suppressed.

  As described above, according to the present invention, at least two thin film members having a predetermined width having airtightness are bonded so as to form a plurality of inflatable portions that absorb an impact on an article to be packed by blowing air. In the combined flat air cushioning material, it is possible to suppress the occurrence of wrinkles at the end of the welded part for bending when the expanded part is expanded with the welded part for bending as a boundary. It is possible to realize an air cushioning material that can suppress a decrease in strength of a thin film member that is a material.

FIG. 1 is a diagram for explaining an air cushioning material according to Embodiment 1 of the present invention. FIG. 1 (a) shows a flat state before the air cushioning material is expanded, and FIG. A part of the expanded air cushioning material (a part equivalent to the A1 part of FIG. 1A) is shown enlarged, and FIG. 1C shows a state where the air cushioning material is expanded and bent. Yes. FIG. 2 is a plan view illustrating the self-sealing blow tube used for the air cushioning material according to Embodiment 1 of the present invention. FIG. 3 is a view for explaining the air cushioning material according to Embodiment 1 of the present invention, in which the expanded air cushioning material is folded into a U-shape and attached to the product (FIG. 3A) and this air cushioning. The state (FIG.3 (b)) which accommodated the material with the product in the cardboard box is shown. FIG. 4 is a diagram for explaining an air cushioning material according to Embodiment 2 of the present invention. FIG. 4 (a) shows a flat state before the air cushioning material is expanded, and FIG. Part of the expanded air cushioning material (a part equivalent to part B1 in FIG. 4A) is shown in an enlarged manner. FIG. 5 is a diagram illustrating an air cushioning material according to Embodiment 3 of the present invention. FIG. 5A shows a flat state before the air cushioning material is expanded, and FIG. A state in which the air cushioning material is expanded and bent is shown three-dimensionally, and FIG. 5C shows an enlarged part (C2 portion) of the air cushioning material shown in FIG. FIG. 6 is a view for explaining an air cushioning material according to Embodiment 3 of the present invention, and shows an enlarged C1 portion of FIG. 5 (a). FIG. 7 is a diagram for explaining an air cushioning material according to Embodiment 3 of the present invention, and FIG. 7A is a cross-sectional view showing a state in which the air cushioning material is expanded, FIG. 7B and FIG. FIG. 7C is a cross-sectional view and a perspective view showing a state where the product is put in the air cushioning material, and FIG. 7D shows a state where the air cushioning material is housed in the cardboard box together with the product. ) Shows an air cushioning material for gaps that fills the gap between the product and the air cushioning material in the cardboard box. FIG. 8 is a view for explaining the airbag disclosed in Patent Document 2. FIG. 8 (a) shows a flat state before the air is introduced into the airbag, and FIG. 8 (b) is inflated. Part of the airbag in the state (part equivalent to part D in FIG. 8A) is shown enlarged, and FIG. 8C shows a state where the airbag shown in FIG. 8A is inflated and bent. Show. FIG. 9 is a diagram for explaining a self-sealing blow tube used in the airbag shown in FIG. 8. FIG. 9 (a) shows a cross-sectional structure taken along the line AA in FIG. FIG. 9B is an enlarged view of the self-sealing blow tube. FIG. 10 shows a state where the airbag shown in FIG. 8A is attached to the product (FIG. 10A) and a state where the airbag is housed in a cardboard box together with the product (FIG. 10B). . FIG. 11 is a view for explaining another conventional airbag having a structure of an air communication path different from that of Patent Document 2. FIG. 11 (a) shows a state of the airbag before the air is introduced. FIG. 11B is an enlarged view of a part of the air flow passage (section communication passage) when the airbag is inflated (a portion equivalent to the portion E in FIG. 11A), and FIG. The airbag shown in FIG. 11A is inflated and folded.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1-3 is a figure explaining the air cushioning material by Embodiment 1 of this invention, FIG.1 (a) shows the flat state before expanding this air cushioning material, FIG.1 (b) ) Is an enlarged view of a portion of the expanded air cushioning material (a portion equivalent to the A1 portion of FIG. 1A), and FIG. 1C is a state where the air cushioning material is expanded and bent. Is shown. FIG. 2 is a diagram illustrating a self-sealing blow tube used for the air cushioning material of the first embodiment. FIG. 3 shows a state in which the expanded air cushioning material of the first embodiment is folded into a U shape and attached to the product (FIG. 3A), and the air cushioning material is housed in a cardboard box together with the product (FIG. 3). 3 (b)).

  This air cushioning material 101 partitions two thin film members (for example, airtight plastic films) 1 and 2 having a constant width into an airtight state that expands by blowing air, as in the conventional airbag 300 shown in FIG. The two films 1 and 2 are bonded together by heat sealing (thermal fusion) at both side edge portions 141 and 142 thereof. The same self-sealing blow tube 10 as described with reference to FIG. 9 is attached to one side edge 141 of the air cushioning material 101. FIG. 2 shows the self-sealing blow tube 10 in an enlarged manner.

  Further, in this air cushioning material 101, a linear welded portion that crosses between one side edge portion 141 and the other side edge portion 142 is formed as a transverse partition welded portion 143 that partitions the adjacent inflatable portion 110. Further, each inflatable portion 110 has two first and second folds as folds so that the inflatable portion 110 can be bent in a plane perpendicular to the length direction Dx of the air cushioning material 101. Bending welds 150 and 160 are formed, and each expansion portion 110 is divided into three first to third divided expansion portions 111 to 113.

  Here, the three divided inflating portions 111 to 113 in one inflating portion 110 are connected so that adjacent ones can circulate air.

  The first bending weld portion 150 includes a pair of projecting portions 151 that project from the adjacent transverse partition weld portions 143 so as to face each other, and the tip 151a of the projecting portion 151 has a rounded shape. Here, between a pair of opposing projecting portions 151, the adjacent divided expansion portions located on both sides (upper and lower sides of the paper) of the first bending weld portion 150, that is, the first divided expansion portion 111 and the first A section communication passage 191 that communicates with the two section expansion portions 112 is formed. That is, the pair of projecting portions 151 serve as a welded portion for the passage that defines the section communication passage 191 as an air flow passage, and the projecting portion 151 faces the section communication passage that is the air flow passage. The edge (tip) 151a has a rounded shape.

  The second welded portion 160 for bending includes a pair of projecting portions 161 projecting so as to face each other from the adjacent transverse partition welded portion 143, and the tip 161a of the projecting portion 161 has a rounded shape. Here, between a pair of opposing projecting portions 161, adjacent segment expansion portions located on both sides (upper and lower sides of the sheet) of the second bending welded portion 160, that is, the second segment expansion portion 112 and the second segment expansion portion 112. A section communication passage 192 that communicates with the three section expansion portions 113 is formed. That is, the pair of projecting portions 161 serves as a welded portion for the passage that defines the section communication passage 192 as an air flow passage, and the passage facing the section communication passage 192 that is the air flow passage of the protrusion 161. The side edge (tip) 161a has a rounded shape.

  Here, as the rounded shape, it is possible to use a convex curved shape of a part of a figure such as a circle, an ellipse, or a parabola.

  Then, air is blown into the first section inflating portion 111 of each inflating portion 110 from the air blowing port of the self-sealing blowing tube 10 via the self-sealing blowing tube 10.

  In the airbag 101 having such a configuration, when the air is blown from the open end of the self-sealing blow tube 10, the respective divided inflating portions 111 to 113 of each inflating portion 110 are inflated, and the inflating portion 110 has a required limit. When the air blowing is stopped at the point where the air is inflated, the self-sealing openings 19, 17, 15, 13 of the self-sealing blowing tube 10 are closed.

  In the air cushioning material 101, as in the case of the conventional airbag 200 (FIG. 8) or 300 (FIG. 11), the inflatable portion 110 can be arbitrarily bent without difficulty even after inflating. The air blowing into the divided expansion portions 111 to 113 is performed through the air flow passages 191 and 192 formed in the welding portions 150 and 160 for bending, which are the portions to be bent of the respective expansion portions. The air cushioning material 101 can flexibly cope with changes in the size and shape of the article V to be packaged by deformation of the section expansion portions 111 to 113. It has become a thing.

  The inflated airbag 101 is mounted on the product V by folding each of the inflatable portions 110 at the welding portions 150 and 160 for folding (FIG. 3A) and accommodated in the cardboard box P for packing together with the product V. (FIG. 3B).

  In this state, even when an external force is applied from the outside of the cardboard box P or the product V is dropped, the shock can be absorbed by the air cushioning material 101 and the product V can be protected.

  Next, the function and effect will be described.

  In the air cushioning material 101 of the first embodiment having such a configuration, the first and second bending welds 150 and 160 that can be bent by dividing the expansion portion 110 into three are formed. Even in a state where each inflatable portion 110 is inflated by blowing air, that is, even after the inflated portion is inflated, the inflatable portion can be bent freely without difficulty.

  Further, in the air cushioning material 101 of the first embodiment, the tips 151a of the protrusions 151 and 161 that form the segment communication passages 191 and 192 that are the air flow passages in the first and second welding portions 150 and 160 for bending. 161a, when the inflating part 110 is inflated, the concentration of stress generated in the thin film members 1 and 2 where the section communication passages 191 and 192 and the projecting parts (passage welding parts) 151 and 161 are adjacent to each other Since the shape of the passage side edges 151a and 161a facing the section communication passages 191 and 192 which are air flow passages is rounded as shown in FIG. 1, the first and second It is possible to suppress the generation of wrinkles in the vicinity of the protruding portions facing the section communication passages 191 and 192 of the welding portions 150 and 160 for bending, and the strength of the air cushioning material 101 is improved. Rukoto can.

  That is, the protrusions (passage welded portions) 151 and 161 that remain flat even when air is blown in, and the sections that are three-dimensional by blowing air adjacent to the passage side edge of the welded portion for the passage By making the boundary with the inflating parts 111 to 113 round, it is possible to alleviate stress concentration at the boundary. Thereby, it can suppress that a wrinkle generate | occur | produces in the part which contact | connects the welding part for a channel | path of a thin film member, and can suppress the strength reduction by the wrinkle of a thin film member.

  Moreover, in the air cushioning material 101 of this Embodiment 1, since the 1st-3rd division | segmentation expansion parts 111-113 which comprise the expansion part 110 are made into the shape which rounded the four corner parts, they are expanded. When the part 110 is inflated, wrinkles can be prevented from occurring at the corners of the respective divided inflating parts constituting the inflating part. That is, in the conventional airbag 200 shown in FIG. 11 (c), when the inflating portion 30 is inflated, wrinkles 33 a to 33 c are generated at the corners of the inflating portion 30. The material 101 can avoid such wrinkles.

  Further, in the air cushioning material 101 of the first embodiment, the self-sealing blow tube 10 is used. Therefore, by blowing air from the open end of the self-sealing blow tube 10, the respective divided expansion portions 111 of the respective expansion portions 110. -113 expands, and further, when the expansion portion 110 expands to the required limit, the air sealing is automatically closed when the air blowing stops and the self-sealing openings 19, 17, 15, 13 of the self-sealing blowing tube 10 are closed. The air can be easily sealed in.

  In addition, air blowing into the section expansion section of each expansion section is performed through an air flow passage (section communication path) formed in a portion of each expansion section to be bent, and air is injected into the air cushioning material. In addition, the air cushioning material can flexibly cope with changes in dimensions and shape of the packaged article by deformation of the inflated portion.

As described above, in the air cushioning material 101 according to the first embodiment, a plurality of inflating portions are formed that absorb the impact on an article to be packed by blowing air into two thin film members (airtight films) having a predetermined width. In the flat air cushioning material 101 bonded to each other, the corners of the divided expansion portions constituting the expansion portions and the end portions of the welded portions for the passages defining the divided communication passages that connect the adjacent divided expansion portions are rounded. By having a shape with an air flow, it is possible to suppress or avoid the occurrence of wrinkles in the vicinity of the corners of each section inflating section and the section communication path that constitute the inflating section, and the generation of wrinkles by bending the inflating section. The strength improvement of the buffer material can be realized.
(Embodiment 2)
FIG. 4 is a diagram for explaining an air cushioning material according to Embodiment 2 of the present invention. FIG. 4 (a) shows a flat state before the air cushioning material is expanded, and FIG. Part of the expanded air cushioning material (a part equivalent to part B1 in FIG. 4A) is shown in an enlarged manner.

  In the air cushioning material 102 according to the second embodiment, the transverse partition welding portion 143 is replaced with the folding seal portions 150 and 160 including the projecting portions 151 and 161 defining the section communication passage in the air cushioning material 101 of the first embodiment. A folding seal portion 170 including a pair of protruding portions 171 that protrude from the expansion portion 120 side to define the division communication path 193 is provided, and the expansion portion 120 is divided into two and can be bent. is there.

  That is, the air cushioning material 102 according to the second embodiment has two thin-film members (for example, airtight plastic films) 1 and 2 having a constant width partitioned into an airtight state that expands by blowing air (expansion portion). ) 120 are formed so that a plurality of films are formed, and the two films 1 and 2 are welded by heat sealing (thermal fusion) at both side edges 141 and 142. The same self-sealing blow tube 10 as shown in FIG.

  Further, in the air cushioning material 102, a linear welded portion that crosses between one side edge portion 141 and the other side edge portion 142 is formed as a transverse partition welded portion 143 that partitions the adjacent inflated portion 120. Further, each of the inflatable portions 120 is formed with a fold welded portion 170 as a fold so that the inflatable portion 120 can be folded in a plane perpendicular to the length direction Dx of the air cushioning material 102. Each expansion part 120 is divided into two first and second divided expansion parts 121 and 122.

  Here, the two section expansion parts 121 and 122 in each expansion part 120 are connected so that air can be circulated.

  The folding welded portion 170 includes a pair of projecting portions 171 that project from the adjacent transverse partition welded portion 143 toward the inflating portion 120 so as to face each other and define the segment communication path 193. The side edge 171a has a smooth curved shape. Here, between the pair of opposing projecting portions 171, the divided expansion portions located on both sides (upper and lower sides of the paper) of the welding portion 170 for bending, that is, the first divided expansion portion 121 and the second divided expansion portion. A section communication passage 193 that communicates with the portion 122 is formed. That is, the pair of protruding portions 171 serves as a welding portion for a passage that defines the section communication passage 193 as an air flow passage, and faces the section communication passage that is the air flow passage of the protrusion portion 171. The passage side edge 171a has a smooth curved shape.

  Here, as the smooth curve shape, it is possible to use a mountain shape such as a curve showing a Gaussian distribution or a curve portion from a valley to a valley of a trigonometric function graph.

  Further, in the air cushioning material 102 of the second embodiment, the shape of the end of the first and second segmented inflating parts 121 and 122 constituting the inflating part 120 on the side opposite to the welding part 170 for bending is semicircular. It has a shape.

  Other configurations of the air cushioning material 102 of the second embodiment are the same as those of the air cushioning material 101 of the first embodiment.

  Next, the function and effect will be described.

  In the air cushioning material 102 according to the second embodiment having such a configuration, the inflatable portion 120 is divided into two to form the folding welded portion 170 that can be folded. Therefore, the inflatable portion 120 is blown by blowing air. Can be bent freely in the inflated state.

  In the second embodiment, the thin film members 1 and 2 are formed when the expanding portion 120 is inflated with the shape of the passage side edge 171a of the protruding portion 171 that forms the air flow passage 193 in the welding portion 170 for bending. The side edge 171a of the passage facing the section communication path 193, which is an air flow path, is relieved so that the stress concentration generated in the section where the section communication path 193 and the protruding portion (passage welding section) 171 are adjacent to each other is alleviated. Since the shape is a smooth mountain-shaped curved shape as shown in FIG. 4B, wrinkles are generated in the vicinity of the protruding portion 171 facing the section communication path 193 of the welding portion 170 for bending. Can be suppressed, and the strength of the air cushioning material can be improved.

In the air cushioning material 102 of the second embodiment, the end portions of the first and second segmented inflating portions 121 and 122 constituting the inflating portion on the side opposite to the welding portion 170 for bending are semicircular. Therefore, when the inflating part is inflated, wrinkles and sharpness occur at the portions adjacent to both side edge parts 141 and 142 of the thin film members 1 and 2 of the respective divided inflating parts 121 and 122 constituting the inflating part. Can be suppressed.
(Embodiment 3)
5-7 is a figure explaining the air cushioning material by Embodiment 3 of this invention, FIG.5 (a) shows the flat state before expanding this air cushioning material, FIG.5 (b) ) Is a three-dimensional view of the air cushioning material expanded and bent, and FIG. 5C is an enlarged view of a portion (C2 portion) of the air cushioning material shown in FIG. 5B. Yes. FIG. 6 is an enlarged view of a part of the air cushioning material shown in FIG. 5A (C1 portion in FIG. 5A). Further, FIG. 7A is a cross-sectional view showing a state where the air cushioning material shown in FIG. 5A is expanded, and FIGS. 7B and 7C show that the air cushioning material is attached to the product. FIG. 7 (d) shows a state in which the air cushioning material is housed in a cardboard box together with the product, and FIG. 7 (e) shows the product and the air cushioning material in the cardboard box. The air cushioning material for gaps that fills the gaps is shown.

  This air cushioning material 103 is formed with a plurality of portions (expanding portions) 70 in which two films (thin film members) having a constant width, that is, the front-side film 1 and the back-side film 2 are partitioned into an airtight state that is expanded by blowing air. The two films 1 and 2 are welded by heat sealing (thermal fusion) at both side edge portions 3 and 4 thereof.

  Here, a self-sealing blow tube 10 is attached to one side edge 3 of the air cushioning material 103, and the self-sealing blow tube 10 extends along the longitudinal direction (the film length direction) Dx. One side edge is sandwiched between these two films 1 and 2 and welded together with the side edges 3 of these films 1 and 2.

  In addition, the air cushioning material 103 includes a pair of linear welded portions that cross between the one side edge portion 3 and the other side edge portion 4, and a transverse partition portion 5 that partitions the adjacent inflating portion 70 and 6 is formed.

  In addition, in the part 5a and 6a (refer FIG. 6) which overlaps the penetration blowing path 11 of the upper end of the crossing partition line parts 5 and 6, the surface film 10a and the back film 10b which comprise the tube 10 (refer FIG.9 (b)). Is not welded, but the surface film 10 a constituting the self-sealing blow tube 10 and the surface-side thin film member 1 constituting the air cushioning material 103 are welded, and the back film 10 b constituting the self-sealing blow tube 10 And the thin film member 2 on the back surface side constituting the air cushioning material 103 are welded. As a result, the through-blowing passage 11 passes through and communicates with the plurality of inflating portions arranged in the length direction of the air cushioning material 103, and each inflating portion 70 is held in an airtight state by the transverse partition line portions 5 and 6. It has a structure.

  Further, as shown in FIG. 5 (b), each inflatable portion 70 can be folded into a U-shape in a plane perpendicular to the length direction Dx of the air cushioning material 103, as shown in FIG. Linear sealing portions are formed as bending weld portions 80 and 90 at portions corresponding to the two corners of the U-shape, and each expansion portion 70 has first to third three-part expansions. It is divided into parts 71 to 73.

  Here, the three divided expansion portions 71 to 73 in each expansion portion 70 are connected so that adjacent ones can circulate air. Specifically, the first divided expansion portion 71 and the second partial expansion portion 71 are connected to each other. Are connected to each other by an air flow passage 85 which is a gap between both end portions 81 of the welding portion 80 for bending that partitions them and the transverse partition portions 5 and 6 adjacent to these end portions. In addition, the second section expansion section 72 and the third section expansion section 73 include both end portions 91 of the bending seal section 90 that partitions them, and the transverse partition sections 5 and 6 adjacent to these end sections. The air flow passage 95 is a gap between the two. Here, the adjacent transverse partition portions 5 and 6 constitute a transverse partition weld portion 60 in which air is not injected between the two films.

  And air is blown into the 1st division | segmentation expansion part 71 of each expansion part 70 via the self-sealing type | mold blowing tube 10 (FIG. 2) used by the air buffer materials of Embodiment 1 etc. .

  In the air cushioning material 103 of the third embodiment, the first bending weld portion 80 is welded to form an air flow passage (section communication passage) 85 that allows the adjacent first section expansion sections 71 and 72 to communicate with each other. It has an end portion (passage welded portion) 81, and when these section expansion portions 71 and 72 are inflated, the concentration of stress generated at the portion of the air flow passage 85 in contact with the weld end portion 81 is alleviated. In this welding end portion 81, the passage side 81a facing the air flow passage 85 has a rounded shape. The second bending weld 90 has a weld end 91 that forms an air flow passage 95 that allows the adjacent second section expansion sections 72 and 73 to communicate with each other. The section expansion sections 72 and 73 are connected to each other. The side edge 91a of the weld end 91 facing the air flow passage 95 is rounded so that the stress concentration occurring at the portion of the air flow passage 95 in contact with the weld end 91 is alleviated when inflated. It has a certain shape.

  Here, as the rounded shape, it is possible to use a curved shape that is a part of a figure such as a circle, an ellipse, or a parabola.

  In such an air cushioning material 103, when air is blown from the open end of the self-sealing blow tube 10, each expansion portion 70 expands, and when the expansion portion 70 swells to a required limit, The self-sealing blow tube 10 is compressed by the air pressure of the pressure, and all of the self-sealing openings 19, 17, 15, and 13 are closed. Thereby, each expansion part 70 maintains expansion | swelling and plays the role of a buffer or packaging.

  As shown in FIGS. 5 (b) and 7 (a), the expanded air cushioning material 103 can be bent freely at the place where the welding parts 80 and 90 for bending are formed, and has a flat rectangular parallelepiped shape. It is attached to both sides of the product V (FIGS. 7B and 7C) and accommodated together with the product V in a packaging cardboard box P (FIG. 7D). In addition, at this time, the part which is not covered with the air cushioning material on the side part of the product has a single shape in which one inflating part in the air cushioning material 300 is cut off, for example, as shown in FIG. By embedding the cushioning material 75, the side surface of the product can absorb the external force and the impact on the product when the side portion becomes the falling surface, and the product can be protected.

  Further, in the air cushioning material 103 of the third embodiment, unlike a cushioning material having a solid volume from the beginning such as a conventional foamed cushioning material made of styrene foam, in an air bag of a type that is inflated by air injection, there is no gap. It is also convenient to be able to fill the gap by deforming to fit the size.

  In the above-described embodiment, the bending weld portion has a round shape in which the central portion is raised in the shape of the projection side, the protruding portion, or the passage side of the weld end portion as the weld portion for the passage. Or a smoothly curved shape with a raised central portion, such as a shape that is continuously changed from both ends of the side of the passage to the central portion thereof, but the side of the passage welded portion of the welded portion for bending However, the shape is not limited to this.

  For example, the shape of the side portion of the passage weld portion of the welding portion for bending is changed stepwise from both ends of the side portion of the passage to the central portion so that the central portion is raised. But you can.

  Specifically, the passage side side of the passage welding portion that defines the air flow passage in the partition welding portion includes a plurality of sides, and an inner angle formed by adjacent sides is an obtuse angle, or the passage welding portion. It may have a shape with a chamfered corner on the passage side.

  Moreover, in each said embodiment, although what expanded the expansion part by the thin film member (airtight film) of two front and back was shown as an air buffer material, an air buffer material has three or more the expansion parts. The thin film member (airtight film) may be used. For example, the air cushioning material may be formed of a plurality of thin film members (airtight films) on at least one of the front surface and the back surface of the expanding portion.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention. Patents, patent applications, and documents cited herein should be incorporated by reference in their entirety, as if the contents themselves were specifically described herein. Understood.

  The present invention relates to a flat air cushioning material in which at least two thin-film members having a predetermined width having airtightness are bonded so as to form a plurality of inflating portions that absorb impacts on articles to be packed by blowing air. In this field, it is possible to suppress the occurrence of wrinkles at the end of the welded portion for bending when the expanded expanded portion is folded with the welded portion for folding as a boundary. It is possible to realize an air cushioning material that can suppress a decrease in strength.

1, 2 Thin film member (Airtight plastic film)
3, 4, 141, 142 Side edge 5, 6 Cross partition 10 Self-sealing blow tube 13, 15, 17, 19 Self-sealing opening 60 Cross partition weld 70, 110, 120 Expansion section 71, 111, 121 First Section expansion parts 72, 112, 122 Second section expansion parts 73, 113 Third section expansion parts 80, 150 First bending welding parts 81, 91 Welding end parts 81a, 91a, 151a, 161a, 171a Side edge 85, 95, 191, 192, 193 Sectional communication path (air flow path)
90, 160 Second bending welded portion 101-103 Air cushioning material 143 Cross partition welded portion 151, 161 Protruding portion 170 Bending welded portion 171 Protruding portion P Corrugated box V Product

Claims (5)

A flat air cushioning material in which at least two thin film members having a predetermined width having airtightness are bonded to form a plurality of inflating portions that absorb shocks on an article to be packed by blowing air,
The thin film member is formed with a partition weld portion that partitions adjacent inflated portions,
The partition weld portion has a passage weld portion that defines an air flow passage in the expansion portion,
When the expansion portion is formed, the air in the passage weld portion is relaxed so that the concentration of stress generated in the portion of the thin film member adjacent to the air flow passage and the passage weld portion is reduced. An air cushioning material in which a passage side edge facing the flow passage is formed into a round shape, a curved shape, or a polygonal line shape having an obtuse angle formed by a plurality of line segments. In the air cushioning material according to claim 1,
The partition welding part is
A plurality of thin film members formed by linear welding along the width direction at a plurality of locations in the length direction so that the plurality of inflatable portions are continuously formed in the length direction of the thin film member. A transverse partition weld,
Each of the plurality of inflatable portions is divided into a plurality of section inflatable portions and can be bent, and the thin film member is defined so that the air flow passage defines a section communication passage for communicating adjacent section inflatable portions. And a welding portion for bending formed by welding along the length direction,
The passage weld portion is an end portion of the bending weld portion facing the section communication passage, and a side edge of the end portion has a round shape. In the air cushioning material according to claim 2,
The bending weld portion includes a pair of projecting portions projecting so as to face each other from the adjacent transverse partition weld portions as the passage weld portion,
An air cushioning material in which a segment communication passage is formed between the pair of projecting portions to communicate the segment expansion portions located on both sides of the welding portion for bending. In the air cushioning material according to claim 2,
The welding part for bending is formed between the adjacent transverse partition welding parts, and both ends of the welding part for bending are the welding parts for the passage,
Between one end of the welding part for bending and the transverse partition welded part facing it, and between the other end of the welding part for bending and the transverse partition welded part facing it, The air cushioning material in which the division communication path which connects the division expansion part located in the both sides of this welding part for bending is formed. In the air cushioning material according to claim 1,
The partition welding part is
A plurality of thin film members formed by linear welding along the width direction at a plurality of locations in the length direction so that the plurality of inflatable portions are continuously formed in the length direction of the thin film member. A transverse partition weld,
The thin film member is formed so that each of the plurality of inflating portions is divided into a plurality of section inflating portions and can be bent, and the air flow passage is formed with a section communicating passage that connects adjacent section expanding portions. And a welding portion for bending formed by welding,
The bending weld portion includes a protruding portion that protrudes from the transverse partition weld portion toward the expansion portion side and defines the section communication passage as the passage weld portion.
An air cushioning material in which the side edge of the protruding portion of the welding portion for bending has a smooth curved shape.

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