Cushioning material sheet and raw fabric roll

Abstract

To normally seal air into an air chamber while smoothly traveling a cushioning material sheet made of mainly paper using an air cushioning material manufacturing device for processing a conventional cushioning material sheet made of a plastic film into an air cushioning material.SOLUTION: An air cushioning material manufacturing device cuts open a lower edge e2 while traveling a cushioning material sheet 1, and supplies air to an air chamber 2 from a supply port 4 via a supply path 3. The cushioning material sheet 1 comprises: a belt-like sheet 6 made of paper folded in half widthwise with the back sides facing each other and laminated with a plastic film on the back side; a horizontal seal part 7 formed by heat-sealing both edge parts thereof to become a partition on the upper side of the air chamber 2; and a vertical seal part 9 disposed on both the right and left sides of the air chamber 2 and extending from the horizontal seal part 7 toward a folded part 8 (lower edge e2) of the belt-like sheet 6 to just before the folded part 8 and formed by heat-sealing an overlapping part of the belt-like sheet 6.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sheet for a cushioning material that is processed into an air cushioning material having a pillow-shaped air chamber filled with air and inflated, and a raw roll formed by winding the sheet for a cushioning material.

Background Art

[0002] Conventionally, as an air cushioning material as described above, for example, as disclosed in Patent Document 1, there is one having an air chamber formed by overlapping and welding films, and the impact is mitigated by the air enclosed in the air chamber. And the sheet for a cushioning material has a partition portion formed by folding a strip-shaped film in half in the width direction and heat-welding it in the width direction. This partition portion is disposed on both sides in the longitudinal direction of the strip-shaped film of the air chamber. When the strip-shaped film is folded in half, a folded-back portion that has extended in the longitudinal direction is formed in the strip-shaped film, and this folded-back portion forms one edge in the width direction of the sheet for a cushioning material. And the air chamber is closed on three sides by the folded-back portion and two partition portions extending in the width direction from this folded-back portion, and the space between the tips of the two partition portions, that is, the side opposite to the folded-back portion side of the air chamber is opened to form an air supply port.

[0003] Generally, an air cushioning material is stored in a flat state of a sheet for a cushioning material in which the air chamber is not inflated in order to reduce the occupied space, and the air chamber is inflated by supplying air to it when needed for use. And in order to save labor and improve productivity in the processing operation of the sheet for a cushioning material into an air cushioning material, in advance, the sheet for a cushioning material is wound into a roll and stored as a raw roll, and using an air cushioning material manufacturing apparatus, while unwinding the sheet for a cushioning material from the raw roll, air is supplied from the supply port to the air chamber, and then the supply port is immediately sealed, thereby completing the air cushioning material in a short time.

[0004] Examples of the above air cushion material manufacturing apparatus include those described in Patent Document 2, which include a pay-out unit that pays out a sheet for the cushion material from an original roll, an air supply unit that supplies air to an air chamber, and a heat-sealing unit that seals the supply port of the air chamber by heat-sealing.

[0005] As shown in FIG. 1, the air supply unit 103 of the air cushion material manufacturing apparatus has an air nozzle 130 that stands vertically from a base 105, a rod-shaped guide member 131, and a cutting blade 132 attached to the lower side of the guide member 131. The heat-sealing unit of the air cushion material manufacturing apparatus has a heating body 145 and a conveying means 140 composed of a pair of conveying belts 141 and the like. The heating body 145 is for heat-sealing the overlapping sheets with the sheet for the cushion material sandwiched therebetween, and the conveying means 140 is for running the sheet for the cushion material in a state of being engaged near the air supply port to the air chamber with the sheet for the cushion material sandwiched from both the front and back sides.

[0006] The sheet for the cushion material for supplying air to the air chamber using an air cushion material manufacturing apparatus having such a guide member has a guided portion that extends along the edge on the opposite side of the folded portion, that is, the edge on the opposite side of one edge. And this guided portion serves as an air supply path, and the overlapping edges on the opposite side of the folded portion of the folded belt-shaped film, that is, the lower edge, are closed so that air does not leak.

[0007] When supplying air to the air chamber of such a sheet for the cushion material, the air cushion material manufacturing apparatus vertically pays out and runs the sheet for the cushion material with its guided portion on the lower side, inserts the guide member of the air supply unit into the guided portion, sprays air from the air nozzle while guiding the sheet for the cushion material, supplies the air from the guided portion to the air chamber through the supply port above it, and the cutting blade cuts open the guided portion of the sheet for the cushion material along the running direction so that the guided portion of the sheet for the cushion material can pass through the raised air nozzle.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, recently, ocean pollution caused by a large amount of plastic waste has become a problem, and in order to protect the environment, it is necessary to reduce the use of plastic as much as possible. Therefore, in order to make the air cushioning material made of a paper-based material, the above-mentioned cushioning material sheet is formed of a sheet obtained by laminating plastic on paper to have airtightness and heat-sealing properties.

[0010] However, when the cushioning material sheet made of a sheet obtained by laminating plastic on paper was processed into an air cushioning material by using the above-mentioned air cushioning material manufacturing apparatus, the running of the cushioning material sheet stopped during the air supply to the air chamber and became jammed with paper, and a problem occurred that air could not be normally sealed in the air chamber.

[0011] The present invention has been made in view of the above problems. An object of the present invention is to normally enclose air in an air chamber while smoothly running a cushioning material sheet made of a paper-based sheet by using an air cushioning material manufacturing apparatus for processing a cushioning material sheet made of a conventional plastic film into an air cushioning material. Means for Solving the Problems and Effects of the Invention

[0012] As a result of investigating the cause of the above problem, it was found that the cause is that the lower edge of the cushioning material sheet cut open by the cutting blade, that is, the edge on the side opposite to the air chamber of the guided portion, is heat-sealed and sealed, whereby the thickness of the heat-sealed portion becomes non-uniform or hardened, and the cutting resistance of the lower edge portion increases, and the cushioning material sheet of the present invention was obtained.

[0013] The sheet for a buffer material according to the first aspect of the present invention has a plurality of air chambers arranged longitudinally along one edge in the width direction, a supply path extending longitudinally along the other edge, and supply ports for each of the air chambers provided on the air chamber side of the supply path. While running the sheet for a buffer material through an air buffer material manufacturing apparatus, the other edge is longitudinally slit, and air is supplied from the supply ports to the air chambers through the supply path. Immediately thereafter, the supply ports are heat-sealed to form a buffer material sheet that is processed into an air buffer material having air chambers filled with air. The buffer material sheet is a strip-shaped sheet formed by laminating a plastic film on the back surface of paper, which is folded in half in the width direction with the back surfaces facing each other so that the plurality of air chambers are formed inside. The buffer material sheet includes a horizontal seal portion formed by heat-sealing both edge portions of the strip-shaped sheet that overlap and extend longitudinally to serve as a partition on the side opposite to the supply path of the air chamber, and longitudinal seal portions formed by heat-sealing overlapping portions of the strip-shaped sheet that are arranged for each air chamber so as to serve as partitions on both sides in the longitudinal direction of the strip-shaped sheet of the air chamber and extend from the horizontal seal portion to the vicinity of the folding portion for folding the strip-shaped sheet.

[0014] With the above configuration, a horizontal seal portion is formed along one edge of the sheet for a buffer material, and the other edge becomes a folding portion that occurs when the strip-shaped sheet is folded in half in the width direction. Therefore, no heat-sealed portion is generated on the other edge of the sheet for a buffer material that is slit by the cutting blade, and an increase in the cutting resistance of the edge portion is suppressed. Further, since the length of the supply port is the same as the longitudinal length of the air chamber, the supply port has a large opening area, and the air chamber can be inflated in a short time. Therefore, according to the sheet for a buffer material of the present invention, the sheet for a buffer material made of a paper-based sheet can be smoothly run while normally filling the air chambers with air using an air buffer material manufacturing apparatus for processing a sheet for a buffer material made of a conventional plastic film into an air buffer material.

[0015] The sheet for a buffer material according to the second aspect of the present invention can be configured to have a rounded seal portion that branches from near the tip on the folding portion side of the longitudinal seal portion for rounding the corners of the air chamber and whose tip is curved so as to protrude toward the air chamber side.

[0016] With the above configuration, since the tip of the longitudinal seal portion and the tip of the rounded seal portion obstruct the flow of air in the longitudinal direction of the supply path, the air supplied to the supply path is less likely to leak to both sides of the air chamber compared to the case where it is only at the tip of the longitudinal seal portion. Therefore, the cross-sectional area of the supply path can be increased to reduce the running resistance, and the sheet for a buffer material can be made easier to run.

[0017] The raw roll according to the third aspect of the present invention is a raw roll formed by winding the above-described sheet for a buffer material of the present invention around a core, and the air buffer material manufacturing apparatus includes a rotary support member for holding the raw roll, which has a cylindrical portion that fits into a hole formed in the end face of the core. The core consists of a cylindrical first core and a cylindrical adapter concentrically attached to one end of the first core. The adapter has the hole that fits the cylindrical portion of the rotary support member on the side opposite to the first core side. The sheet for a buffer material can be configured to be arranged on the core such that the lateral seal portion side of the sheet for a buffer material is located on the first core side of the core and the supply port is located at the height of the heating body of the heat fusion portion of the air buffer material manufacturing apparatus.

[0018] With the above configuration, the raw roll can be accurately, easily, and quickly installed in the air buffer material manufacturing apparatus. Also, it is convenient because a relatively inexpensive known core such as a paper tube can be used as the first core.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below are examples of a sheet for a cushioning material and an original roll for embodying the technical idea of the present invention, and the present invention is not limited to these. Also, this specification does not in any way identify the members shown in the claims with the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention thereto alone, but are merely illustrative examples. Note that the sizes and positional relationships of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same names and reference numerals indicate the same or equivalent members, and detailed descriptions will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are formed of the same member and one member serves as a plurality of elements, or conversely, the functions of one member may be shared by a plurality of members.

[0021] FIG. 1 is a side view of a sheet for a cushioning material according to a first embodiment of the present invention. The sheet 1 for a cushioning material is in a state of being processed into an air cushioning material by being applied to an air cushioning material manufacturing apparatus similar to that described in Patent Document 1. The sheet 1 for a cushioning material has a plurality of air chambers 2 arranged in the longitudinal direction along one edge e1 in the width direction, a supply path 3 extending in the longitudinal direction along the other edge e2, and supply ports 4 provided for each air chamber 2 on the air chamber 2 side of the supply path 3. The sheet 1 for a cushioning material is a belt-shaped sheet 6 formed by laminating a plastic film on the back surface of paper, in which the plurality of air chambers 2 are formed inside, the back surfaces are opposed to each other, and the both edge portions extending in the longitudinal direction are overlapped with each other in the width direction. A horizontal seal portion 7 formed by heat-sealing both edge portions of the belt-shaped sheet 6 that overlap and extend in the longitudinal direction and serve as partitions on the side opposite to the supply path 3 of the air chamber 2. The air chamber 2 is arranged for each air chamber 2 so as to serve as a partition on both sides in the longitudinal direction of the belt-shaped sheet 6, and extends from the horizontal seal portion 7 to the vicinity of the folding portion 8 for folding the belt-shaped sheet 6, and has a vertical seal portion 9 formed by heat-sealing the overlapping portions of the belt-shaped sheet 6.

[0022] The supply path 3 has a width from the folding portion 8 of the double-folded belt-shaped sheet 6 to the lower end of the vertical seal portion 9. The supply port 4 is formed by an unsealed portion between the tips of the left and right vertical seal portions 9 for each air chamber 2.

[0023] When the sheet 1 for buffer material is applied to the air buffer material manufacturing apparatus, the air buffer material manufacturing apparatus conveys it in the direction of the arrow by the conveying means 140 composed of a pair of conveying belts 141 with the guide member 131 inserted into the supply path 3, and cuts open the other edge e2 in the longitudinal direction with the cutting blade 132 fixed to the lower side of the rear end portion of the guide member 131. At the same time, air is ejected from the holes formed on the upper surface of the air nozzle 130 and the through holes 131a formed in the guide member 131, and the air is supplied from the supply port 4 to the air chamber 2 through the supply path 3. Immediately after that, the supply port 4 is heat-sealed by a pair of heating bodies 145. And the portion where the supply port 4 is heat-sealed becomes the supply port seal portion 10. Thereby, the sheet 1 for buffer material is processed into the air buffer material 5 having the air chamber 2 filled with air. In this embodiment, between the adjacent air chambers 2 of the sheet 1 for buffer material, perforations 11 are formed so that they can be easily separated after the air is enclosed in the air chamber 2. Note that the heat-sealing portion 104 of the air buffer material manufacturing apparatus may be composed of, for example, a pair of delivery rollers that run while sandwiching the sheet 1 for buffer material from both the front and back surfaces, and a pair of conveying seal rollers that run while sandwiching the sheet 1 for buffer material from both the front and back surfaces and heat-seal it.

[0024] Figs. 2 to 5 show an embodiment of the original roll of the present invention. This original roll R is formed by winding the sheet 1 for buffer material according to the present invention around the core C in a roll shape. The air buffer material manufacturing apparatus includes a rotary support member 120 shown in Fig. 5 for holding the original roll R. This rotary support member 120 has a cylindrical column portion 122 protruding from the upper surface of a disc-shaped support portion 121. This column portion 122 is fitted into the hole 14 provided in the end face of the core C as shown by the two-dot chain line in Fig. 2.

[0025] The core C is composed of a cylindrical first core 12 and a cylindrical adapter 13 concentrically attached to one end of the first core 12. The adapter 13 has a hole 14 on the side opposite to the first core 12 side and adapted to the column portion 122 of the rotary support member 120. This hole 14 becomes the hole 14 of the core C.

[0026] The sheet 1 for the cushioning material is arranged on the winding core C such that the side of its lateral seal portion 7 is located on the side of the first winding core 12 of the winding core C, and the supply port 4 is positioned at the height of the heating body 145 of the heat fusion portion 104 of the air cushioning material manufacturing apparatus. In this embodiment, the distance obtained by adding the distance from the upper surface of the base 105 to the upper surface of the disk-shaped support portion 121 of the rotary support member 120 and the distance from the other edge e2 of the sheet 1 for the cushioning material, that is, the distance from the lower edge to the supply port 4, is equal to the distance from the base 105 to the heating body 145. Then, as shown in FIG. 2, the length of the winding core C is made the same as the width of the sheet 1 for the cushioning material, and the sheet 1 for the cushioning material is wound around the winding core C such that the lower end of the winding core C and the other lower edge e2 of the sheet 1 for the cushioning material are aligned. Therefore, when the raw material roll R is attached to the rotary support member 120, the heights of the supply port 4 and the heating body 145 automatically match, which is convenient. Further, since the winding core C does not protrude from the end face of the raw material roll R, the raw material roll R has good stability when its end face is placed on the support surface and is easy to handle during storage, transportation, etc.

[0027] FIG. 6 is a side view of a sheet for a cushioning material according to a second embodiment of the present invention. This sheet 1 for a cushioning material branches from near the tip on the side of the folding portion 8 of the longitudinal seal portion 9 for rounding the corners of the air chamber 2, and the tip is curved so as to protrude toward the air chamber 2 side, and has a round seal portion 15 and a round seal portion 16 straddling the lateral seal portion 7 and the longitudinal seal portion 9, which is different from the sheet 1 for a cushioning material according to the above-described first embodiment. According to this embodiment, since each corner of the air chamber 2 has a round shape due to the round seal portion 15 and the round seal portion 16, stress concentration at the corner portion of the air chamber 2 can be reduced, and the load-bearing property of the air cushioning material 5 can be improved.

Explanation of Reference Numerals

[0028] 1... Sheet for cushioning material 2... Air chamber 3... Supply path (guided portion) 4... Supply port 5... Air cushioning material 6... Band-shaped sheet 7... Lateral seal portion 8... Folding portion 9... Longitudinal seal portion 10…Supply port sealing part 11…Stitch 12…First core 13…Adapter 14…Hole 15…Round sealing part 16…Round sealing part 103…Air supply part 104…Heat-sealing part 105…Base 120…Rotary support member 121…Disk-shaped support part 122…Cylindrical part 130…Air nozzle 131…Guide member; 131a…Hole 132…Cutting edge 140…Conveying means 141…Pair of conveying belts 145…Heating element C…Core e1…One edge e2…The other edge R…Web roll

Claims

1. A plurality of air chambers arranged longitudinally along one edge in the width direction, a supply path extending longitudinally along the other edge, and supply ports for each of the air chambers provided on the air chamber side of the supply path. While running the air buffer material manufacturing apparatus, the other edge is longitudinally slit, air is supplied from the supply ports to the air chambers through the supply path, and immediately thereafter, the supply ports are heat-sealed to form an air buffer material having air-sealed air chambers. A sheet for a buffer material, which is processed into: A strip-shaped sheet formed by laminating a plastic film on the back surface of paper, with the back surfaces facing each other so that the plurality of air chambers are formed inside and folded in half in the width direction; A horizontal seal portion formed by heat-sealing both edge portions of the strip-shaped sheet that overlap and extend longitudinally and serve as partitions on the side of the air chambers opposite to the supply path; Longitudinal seal portions formed by heat-sealing the overlapping portions of the strip-shaped sheet, which are arranged for each air chamber so as to serve as partitions on both sides in the longitudinal direction of the strip-shaped sheet of the air chambers, and extend from the horizontal seal portion to the vicinity of the tip on the side of the folding portion for folding the strip-shaped sheet; A sheet for a buffer material, characterized by comprising the above.

2. A sheet for a buffer material according to Claim 1, Having a rounded seal portion that branches from near the tip on the folding portion side of the longitudinal seal portion for rounding the corners of the air chambers and has a tip that curves so as to protrude toward the air chamber side.

3. A raw roll formed by winding the sheet for a buffer material according to Claim 1 or Claim 2 in a roll around a core, The air buffer material manufacturing apparatus includes a rotary support member for holding the raw roll, which has a cylindrical portion that fits into a hole formed in the end face of the core, The core consists of a cylindrical first core and a cylindrical adapter concentrically attached to one end of the first core, The adapter has a hole on the side opposite to the first core side that fits the cylindrical portion of the rotary support member, The sheet for a buffer material is arranged on the core such that the horizontal seal portion side of the sheet for a buffer material is located on the first core side of the core, and the supply port is located at the height of the heating element of the heat-sealing portion of the air buffer material manufacturing apparatus. A raw roll characterized by this.

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