JP6101072B2 - Buffer material and method of manufacturing the buffer material - Google Patents

Description

  The present invention relates to a cushioning material and a method of manufacturing the cushioning material, and in particular, a plurality of independent air chambers formed by sealing the air sent between two resin sheets transported in an opposing state while sealing between the sheets. The present invention relates to a cushioning material manufactured by being enclosed in and a manufacturing method of the cushioning material.

When packing precision machinery or waste, etc., a cushioning material having a plurality of air chambers is used, and a typical example of such a cushioning material is a bubble sheet.
For example, the air bubble sheet is formed by bringing a resin film in a molten state into contact with the outer peripheral surface of a molding roll in which a plurality of cavities are formed, and forming protrusions corresponding to the cavity shape in the cavities by vacuum forming to form a cap film. Later, it can be manufactured by thermally fusing a back film to the opening side of the protrusion.

Such a bubble sheet is disadvantageous in that it is bulky because it is already filled with air and transport efficiency is reduced.
Considering the transport efficiency, it is efficient to produce the bubble sheet in the place of use (on-site) without transporting the bubble sheet. However, since the production equipment for the bubble sheet requires a complicated apparatus for melting the resin film and vacuum forming as described above, and the capital investment is enormous, it is possible to buffer the resin film by a simple method. A production method capable of producing a material has been desired.

Patent Document 1 proposes an apparatus for producing a buffer material from a resin film by a comparatively simple method.
The apparatus includes a first rotary sealing device for creating a transverse seal that joins two juxtaposed film layers together, an expansion assembly for directing gas between the film layers, a transverse seal, A second rotary sealing device for creating an intersecting longitudinal seal between the film layers, wherein the gas is enclosed between the longitudinal seal, the transverse seal, and the film layer, thereby expanding the article Is to be formed.

Special table 2008-537706 gazette

  However, in the expanded article manufactured by the apparatus described in Patent Document 1, the individual air chambers are regularly arranged in a lattice pattern, and the seal portions appear at regular intervals along the longitudinal direction of the expanded article. When packing a machine or the like, only the seal portion may come into contact with the precision machine, and the shock absorption as a cushioning material may be reduced.

  The present invention has been made in order to solve such problems. The seal portion is formed obliquely along the longitudinal direction of the sheet, and the buffer portion is prevented from contacting only the seal portion with the packaged body. An object of the present invention is to provide a shock-absorbing material and a shock-absorbing material manufacturing method that can be easily manufactured while improving the shock absorption as a material.

  In order to achieve the above object, the cushioning material of the present invention encloses the air sent between two resin sheets conveyed in an opposed state into a plurality of independent air chambers formed while sealing the sheets. And the plurality of air chambers are portions where the opposing surfaces of the two resin sheets are heat-sealed, with respect to the sheet longitudinal direction, which is the direction in which the resin sheet is conveyed A right diagonal seal line that is inclined obliquely to the right and a left diagonal seal line that is inclined obliquely to the left with respect to the longitudinal direction of the sheet and intersects the right oblique seal line. is there.

  In the method of manufacturing the cushioning material of the present invention, the air sent between two resin sheets conveyed in a facing state is sealed in a plurality of independent air chambers formed while sealing between the sheets. A method of manufacturing a cushioning material to be manufactured, wherein the first rotation with the sheet width direction orthogonal to the direction in which the resin sheet is conveyed as the axial direction is a part where the opposing surfaces of the two resin sheets are heat-sealed A seal line that is inclined to the right or left with respect to the longitudinal direction, which is the direction in which the resin sheet is conveyed, is formed by the first heating unit that is provided on the body and spirally disposed along the axial direction. A second rotating body is provided in a second rotating body with the sheet width direction arranged in the downstream side of the first rotating body in the transport direction of the resin sheet as an axial direction, and spirally arranged along the axial direction. By the first heating unit by the heating unit A seal line inclined obliquely left or right with respect to the longitudinal direction intersecting the right or left oblique seal line formed in the above is formed, and the plurality of independent air chambers are formed by these intersecting seal lines. As a manufacturing method in which

  According to the cushioning material and the cushioning material manufacturing method of the present invention, since the seal line is formed obliquely with respect to the longitudinal direction of the sheet so that the packaged body does not contact the seal portion, the packaged body contacts the air chamber. By increasing the ratio, the shock absorbing property as the buffer material is improved, and the buffer material can be manufactured only with a simple sealing device without providing a complicated device.

It is a figure of the shock absorbing material which concerns on one Embodiment of this invention, (a) is a top view, (b) is AA sectional drawing. It is a perspective view which shows typically the shock absorbing material manufacturing apparatus which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of the cushioning material and the cushioning material manufacturing method according to the present invention will be described with reference to FIGS. 1 and 2.

The cushioning material 1 according to the present embodiment has a plurality of independent airs formed by sealing the air A sent between two resin sheets 10 (10a, 10b) conveyed in a facing state. It is a cushioning material manufactured by being enclosed in the chamber 4.
The resin sheet 10 is made of a synthetic resin, and for example, polyethylene, PET (polyethylene terephthalate), or a multilayer film such as polyethylene / nylon (registered trademark) can be used to improve gas barrier properties.

  The cushioning material 1 is composed of a single resin sheet 10 that is folded in half with the folded portion 7 as a base point, and the independent air chambers 4 are opposed surfaces of the two resin sheets 10a and 10b as shown in FIG. A plurality of right oblique seal lines R formed obliquely to the right with respect to the sheet longitudinal direction L, and formed obliquely inclined to the left with respect to the sheet longitudinal direction L. A plurality of left oblique seal lines L intersecting with the oblique seal lines R are partitioned and formed in a substantially square shape in plan view.

Each right diagonal seal line R is formed continuously over the sheet width direction W by continuously connecting a plurality of right diagonal seal portions 2 and intersections 5 with respect to the sheet longitudinal direction L. And tilted 45 degrees to the right.
Similarly, each left diagonal seal line L is formed continuously over the sheet width direction W by continuously connecting a plurality of left diagonal seal portions 3 and intersections 5, and the longitudinal direction of the sheet. Inclined 45 degrees to the left with respect to L.
The intersecting portion 5 is a fused portion where the right oblique seal line R and the left oblique seal line L intersect.
In addition, since the cushioning material 1 of the present embodiment is formed by folding a single resin sheet 10 in half with the folded portion 7 as a base point, the right end portion that is the opposite end portion of the folded portion 7 is: Although the two resin sheets 10a and 10b are originally open end portions that can be separated, the right end seal portions 6 are heat-sealed so that the right end portions of the sheets cannot be separated from each other.

With such a configuration, in the sheet width direction W perpendicular to the sheet longitudinal direction L, for example, as shown in the AA cross-sectional view of FIG. It always has a concavo-convex shape, so that the shock absorption for the packaged body is improved.
In particular, when packing the cushioning material 1 along the longitudinal direction L around a long packaged body (for example, a circle or a prismatic body), the seal line does not come into contact with the packaged body. Therefore, the impact absorbability with respect to the packaged body is improved.

[Buffer material manufacturing equipment]
Such a buffer material 1 is manufactured by the buffer material manufacturing apparatus 100 shown in FIG.
The shock absorber manufacturing apparatus 100 blows air A between the resin sheets 10a and 10b from the first rotating body 110, the second rotating body 120, and the upstream side in the sheet conveying direction F toward the downstream side (a direction). Means (not shown).
The blower unit is composed of, for example, a blower such as a fan or a blower or a compressor such as a pump, and sends out air A compressed at a predetermined compression ratio between the resin sheets 10a and 10b.

The first rotator 110 and the second rotator 120 are roll type sealing devices that heat-bond the opposing surfaces of the two resin sheets 10a and 10b while conveying the resin sheet 10 in the F direction. .
In this embodiment, the 1st rotary body 110 operate | moves as a sealing apparatus which forms the left diagonal seal line L, and the 2nd rotary body 120 operate | moves as a seal apparatus which forms the right diagonal seal line R.
In the present embodiment, the first rotating body 110 is disposed on the upstream side in the conveyance direction F of the resin sheet 10 and the second rotating body 120 is disposed on the downstream side. The opposite arrangement relationship can also be adopted.

The first and second rotating bodies 110 and 120 include a first heating roll 111 and a first rubber roll 112 in order to realize an operation as a sealing device. Two heating rolls 121 and a second rubber roll 122 are provided.
The first heating roll 111 and the second heating roll 121 are driven to rotate by predetermined motors, respectively, and the first rubber roll 112 and the second rubber roll 122 are driven to rotate.

The first heating roll 111 includes a first heating unit 111a and a right end heating unit 111b on the outer peripheral surface, and the second heating roll 121 includes a second heating unit 121a on the outer peripheral surface.
Each heating section 111a, 111b, 121a is formed to protrude outward from the outer peripheral surface of each roll 111, 121 at a predetermined height (for the thickness of the air chamber 4 in which air is enclosed), A belt-shaped heater (for example, nichrome wire), a temperature sensor for measuring the temperature of the heater, and the like are embedded. Moreover, the front-end | tip part of the 1st heating part 111a and the right end part heating part 111b is formed so that it may be connected flush.
Moreover, the 1st heating part 111a and the 2nd heating part 121a are wound by the spiral shape which inclines at 45 degree | times along the rotating shaft direction in the outer peripheral surface of each heating roll 111,121 when a roll peripheral surface is expand | deployed. In addition, each of the heating units 111a and 121a is formed to be inclined in line symmetry with respect to the rotation axis.

With such a configuration, in the first rotating body 110, the left heating seal part 3a is formed by heating the first heating part 111a while sandwiching the resin sheet 10 into which the air A is sent between the first heating part 111a and the first rubber roll 112. In the second rotating body 120, the second obliquely sealed portion 2 is formed by heating the second heating portion 121 a while sandwiching the resin sheet 10 into which the air A has been sent between the second rubber roll 122. Become. As a result, a plurality of air chambers 4 filled with air A are partitioned.
In the first rotating body 110, the right end seal unit 3 b is heated while sandwiching the resin sheet 10 fed with air A between the first rubber roll 112 and the right end seal unit 3 b simultaneously with the formation of the left oblique seal unit 3. Part 6 is formed.
With such an apparatus configuration, the cushioning material 1 shown in FIG. 1 is manufactured by a manufacturing method as described below.

[Buffer material manufacturing method]
First, a single resin sheet 10 is fed into the first rotating body 110 while being folded in half with the folded portion 7 as a base point.
At this time, the air A is sent between the resin sheets 10a and 10b from the upstream side in the transport direction to the downstream side (direction a) by the blowing means.
Thus, by sending the air A along the conveyance direction F, a constant pressure is applied to the resin sheet 10 beyond the first rotating body 110 from the gap between the first heating roll 111 and the first rubber roll 112. Therefore, the air A can be efficiently enclosed in the air chamber 4.

In the first rotating body 110, a plurality of left oblique seal portions 3 along the left oblique seal line L are formed by the first heating portion 111a and the right end heating portion 111b, and at the same time, a right end seal portion is provided at the right end portion of the resin sheet 10. 6 is formed.
Next, the resin sheet 10 on which the left oblique seal portion 3 and the right end seal portion 6 are formed is fed into the second rotating body 120 while holding air between the seal portions.
In the second rotating body 120, a plurality of intersecting portions 5 are formed at the intersecting portions with the right oblique seal portion 2 and the left oblique seal line L along the right oblique seal line R by the second heating portion 121a.
Thereby, the cushioning material 1 in which a plurality of air chambers 4 defined by the left oblique seal line L and the right oblique seal line R are formed is manufactured.
In the cushioning material 1 manufactured in this way, no seal line is formed in the sheet width direction W orthogonal to the sheet longitudinal direction L, and an uneven shape is always formed in this direction (FIG. 1). (Refer to (b)), the impact absorbability to the packaged body is improved.

As described above, according to the cushioning material and the cushioning material manufacturing method according to the present embodiment, the seal line is formed obliquely with respect to the sheet longitudinal direction so that the packaged body does not contact the seal portion. By increasing the proportion of the packaged body in contact with the air chamber, the shock absorption as a cushioning material is improved.
In addition, unlike the bubble sheet manufacturing equipment, there is no need for complicated equipment for resin sheet melting, vacuum forming, etc., and cushioning materials can be manufactured using only a simple sealing device. can do.
In addition, in the conventional air bubble sheet, the cap film that is vacuum-formed has uneven thickness due to suction, and therefore it has been necessary to form an extra thick wall to maintain strength. Since the sheet thickness is uniform in the first place, it can be formed 30% or thinner (lighter) while having the same strength as the conventional bubble sheet, and the material cost can be reduced.

  As mentioned above, although the preferable embodiment was shown and demonstrated about the shock absorbing material and the manufacturing method of the shock absorbing material of this invention, the manufacturing method of the shock absorbing material and the shock absorbing material of this invention is not limited only to embodiment mentioned above. Needless to say, various modifications can be made within the scope of the present invention.

For example, in the present embodiment, the first rotating body 110 is provided with the first heating unit 111a and the right end heating unit 111b, but a rotating body (heating roll and rubber roll) having only the right end heating unit 111b is used as the first rotating body 110. It can also be provided on the upstream side.
Moreover, in the shock absorbing material 1 of this embodiment, although the right end seal part 6 was provided, it can also be set as the structure which does not provide the right end seal part 6. FIG. This is because the right end portion of the resin sheet 10 is zigzag sealed by the right oblique seal portion 2 and the left oblique seal portion 3 without providing the right end seal portion 6.

In the present embodiment, the air blowing means sends out the air A from the upstream side in the transport direction toward the downstream side (direction a). However, as shown in FIG. It is also possible to send air A between the rotating body 110 and the second rotating body 120 in the b direction (sheet width direction W) or along the left oblique seal line L.
In this case, the second rotating body 120 may be provided with the right end heating unit 111 b to form the right end seal unit 6 simultaneously with the right oblique seal unit 2. Further, for the reason described above (zigzag seal), the right end heating unit 111b may be omitted.

Moreover, in this embodiment, although manufactured in the state which folded the single resin sheet 10 in half, it can also manufacture in the state which piled up the single resin sheet 10 each.
Further, in the present embodiment, both the right oblique seal line R and the left oblique seal line L are inclined 45 degrees with respect to the longitudinal direction L. However, they are left-right symmetrical (or left-right asymmetric) between 0 degrees and less than 90 degrees. Can tilt.
Moreover, although both the right diagonal seal line R and the left diagonal seal line L are formed continuously in the sheet width direction W, they may be interrupted in the middle.

The air sealed in the air chamber 4 includes gases such as nitrogen gas, carbon dioxide gas, and carbon monoxide.
Further, the air containing these gases is not limited to being colorless and odorless, but can be colored in a predetermined color or can include a predetermined fragrance.
Further, a perforation may be provided along the right oblique seal line R and / or the left oblique seal line L so that the cushioning material 1 can be divided.

  The present invention is suitable for a cushioning material manufactured by enclosing air sent between two resin sheets conveyed in an opposed state into a plurality of independent air chambers formed while sealing between the sheets. Is available.

DESCRIPTION OF SYMBOLS 1 Buffer material 2 Right diagonal seal part 3 Left diagonal seal part 4 Air chamber 5 Crossing part 6 Right end seal part 7 Folding part 10 Resin sheet 100 Buffer material manufacturing apparatus 110 1st rotary body 111 1st heating roll 111a 1st heating part 111b Right end heating unit 112 First rubber roll 120 Second rotating body 121 Second heating roll 121a Second heating unit 122 Second rubber roll R Right diagonal seal line L Left diagonal seal line

Claims (3)

A cushioning material manufactured by enclosing air sent between two resin sheets conveyed in an opposing state into a plurality of independent air chambers formed while sealing between the sheets,
The resin sheet is obtained by folding one resin sheet in half with a folded portion as a base point to form two resin sheets, and has an open end portion that is detachably opened as an opposite end portion of the folded portion. It has along the direction in which the resin sheet is conveyed,
The plurality of air chambers are portions where the opposing surfaces of the two resin sheets are heat-sealed.
A right oblique seal line formed obliquely to the right with respect to the sheet longitudinal direction, which is the direction in which the resin sheet is conveyed,
The left oblique seal line that is formed to be inclined obliquely to the left with respect to the longitudinal direction of the sheet and that intersects the right oblique seal line ,
A cushioning material, comprising: a seal portion in which the open end portion is heat-sealed . The cushioning material according to claim 1, wherein the air is sent in a sheet conveying direction. A method of manufacturing a cushioning material manufactured by enclosing air sent between two resin sheets conveyed in an opposed state into a plurality of independent air chambers formed while sealing between the sheets,
The resin sheet is obtained by folding one resin sheet in half with a folded portion as a base point to form two resin sheets, and has an open end portion that is detachably opened as an opposite end portion of the folded portion. It has along the direction in which the resin sheet is conveyed,
As the part where the opposite surfaces of the two resin sheets are heat-sealed,
A resin sheet is conveyed by a first heating unit provided in a first rotating body having a sheet width direction orthogonal to a direction in which the resin sheet is conveyed as an axial direction, and arranged spirally along the axial direction. A seal line inclined right or left diagonally with respect to the longitudinal direction is formed,
The end heating unit provided in the first rotating body is formed with the seal line that is heat-sealed to the open end together with the seal line inclined right or left,
A second rotating body is provided in a second rotating body with the sheet width direction arranged in the downstream side of the first rotating body in the transport direction of the resin sheet as an axial direction, and spirally arranged along the axial direction. The heating unit forms a seal line inclined obliquely left or right with respect to the longitudinal direction intersecting the seal line inclined obliquely to the right or left formed by the first heating unit,
The method for manufacturing a cushioning material according to claim 1 or 2, wherein the plurality of independent air chambers are partitioned by the intersecting seal lines.

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