JP2021187474A - Cushioning sheet - Google Patents

Abstract

To provide a cushioning sheet that is easy to handle during use and disposal, and can securely obtain a cushioning action during use.SOLUTION: A cushioning sheet is formed in a sheet shape by a sheet-shaped three-dimensional cushioning material 12 made by stretching and three-dimensionalizing a cushioning material which is a sheet material in which a large number of slits extending in one direction are arranged in a staggered pattern, and an exterior sheet 13 sandwiching both sides of the three-dimensional cushioning material 12. Paper is used as a material of the three-dimensional cushioning material 12 and the exterior sheet, in addition to being used as a sheet, it is also used as a packaging material or a material of the packaging material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cushioning sheet used for packaging, packaging and the like.

As the cushioning material as described above, there is the following Patent Document 1. This cushioning material is formed by disposing a large number of slits extending in one direction on a paper sheet. Specifically, a large number of slit rows in which slit portions and non-slit portions are alternately arranged in a straight line are arranged side by side. The middle positions of the parts are lined up.

Such a cushioning material is used after the slit is formed into a substantially honeycomb shape by pulling and stretching the slit in the widening direction. The pulling work is done by hand, and it is used for packing as a cushioning material by rolling or folding it. Since the cushioning material is made of paper, it is easy to handle including disposal.

Japanese Unexamined Patent Publication No. 1-226574

However, since the slit is stretched into a honeycomb shape before use, if the slit is closed when it is rolled or folded when the cushioning material is packed, the cushioning capacity is reduced.

Therefore, it is a main object of the present invention to ensure that the buffering action can be surely obtained in addition to being easy to handle.

The means for that purpose is a cushioning sheet composed of a sheet-shaped three-dimensional cushioning material made of a paper-based material and a plant-derived exterior sheet sandwiching both sides of the three-dimensional cushioning material.

In this configuration, the exterior sheet covers both sides of the three-dimensional cushioning material and holds the three-dimensional cushioning material.

According to the present invention, since both sides of the three-dimensional cushioning material are sandwiched between the exterior sheets, the form of the three-dimensional cushioning material is maintained. Therefore, a reliable buffering action can be obtained simply by wrapping or packing. In addition, since the three-dimensional cushioning material and the exterior sheet are plant-based, they are easy to handle.

Partially broken front view of the cushioning sheet. Sectional drawing of the cushioning sheet. Front view showing the structure of the cushioning material. Front view of the exterior sheet.

An embodiment for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 shows a partially broken front view of the cushioning sheet 11. As shown in this figure, the cushioning sheet 11 is formed in the form of a sheet having an appropriately large and appropriately shaped shape, and a three-dimensional cushioning material 12 is charged therein. FIG. 2 shows a cross-sectional view of the cushioning sheet 11.

That is, the cushioning sheet 11 is composed of a sheet-shaped three-dimensional cushioning material 12 and an exterior sheet 13 sandwiching both sides of the three-dimensional cushioning material 12. The three-dimensional cushioning material 12 is made of a paper-based material, and the exterior sheet 13 is made of a plant-derived material.

First, the three-dimensional cushioning material 12 will be described.

The three-dimensional cushioning material 12 is obtained by stretching the cushioning material 21 which is a flat sheet material as shown in FIG. 3A.

The cushioning material 21 has a large number of slits 22 extending in one direction arranged in a staggered manner. The slit 22 is a cut penetrating in the thickness direction.

The slits 22 of the cushioning material 21 are arranged in a straight line at equal intervals. Assuming that a virtual straight line having a slit 22 is a slit row, the slit row is formed by a slit 22 having a predetermined length and a non-slit 23 between the slits 22 as shown by enlarging a part of the row in FIG. 3 (a). It will be configured. A large number of such slit rows are arranged side by side, and the intermediate positions between the slits 22 and the non-slits 23 of the adjacent slit rows are arranged so as to be aligned with each other. In FIG. 3A, L indicates the slit length and W indicates the slit interval.

Since such a cushioning material 21 is merely a sheet having a slit 22, it does not have much buffering action. However, when the slit 22 was expanded in a direction orthogonal to the longitudinal direction of the slit 22, a honeycomb-shaped eye 24 (opening) was formed as shown in (b) of FIG. 3 by enlarging a part of the slit 22. It becomes the three-dimensional cushioning material 12. The portion forming the eye 24, that is, the portion other than the slit 22, has a structure in which the cushioning material 21 is inclined diagonally with respect to the surface direction to exert a buffering action.

As described above, the material of the cushioning material 21 is paper-based, but specifically, there are kraft paper, corrugated cardboard base paper, and the like, and it is preferable that the cushioning material 21 is a chewy material.

Next is the exterior sheet 13, which is composed of a single flat sheet. As described above, the exterior sheet 13 is made of a plant-derived material, and is specifically made of, for example, paper or non-woven fabric.

Various types of paper can be used. Examples of the non-woven fabric include spunlace non-woven fabric and wet non-woven fabric using various materials such as rayon and dry pulp. The paper or non-woven fabric may be coated.

The desirable exterior sheet 13 has a plant-derived component of 90% or more. Originally, the cushioning sheet 11 should be 100% plant-derived. However, depending on the raw material of the material and the purpose of use, if the binder such as an adhesive is not derived from a plant, sufficient strength physical properties cannot be obtained and it may not be suitable for use and cannot be used as a cushioning sheet. It may not be possible to eliminate all of them. However, if 10% or more of the plant-derived material is contained, it cannot be said that it is a plant-derived cushioning material. Therefore, as described above, it is desirable that the exterior sheet 13 contains 90% or more of the plant-derived component.

One or two exterior sheets 13 are used, and the three-dimensional cushioning material 12 is loaded between the exterior sheets 13. When bonding the exterior sheets 13 to each other and holding the three-dimensional cushioning material 12 by bonding with an adhesive, the adhesive 14 (see FIG. 4) is applied to the inner side surfaces of the two exterior sheets 13 and the exterior sheet 13 is applied. A three-dimensional cushioning material 12 having a size that fits inside is attached.

As shown in FIG. 4, the adhesive 14 is applied to the outer peripheral edge portion 31 and the inner peripheral portion 32 of the exterior sheet 13. The adhesive 14 of the outer peripheral edge portion 31 is mainly for joining the exterior sheets 13 to each other, and the adhesive 14 of the inner peripheral portion 32 is for joining the three-dimensional cushioning material 12. The adhesive 14 of the inner peripheral portion 32 can be applied to the entire surface, but it is preferably applied partially. This is to obtain a degree of freedom of deformation while restraining the three-dimensional cushioning material 12.

In the example of FIG. 4, the adhesive 14 of the inner peripheral portion 32 is formed on the two diagonal lines of the square exterior sheet 13 with an appropriate width, but for example, to draw parallel lines or to draw a plurality of circles. In addition, an appropriate coating mode can be adopted.

In the exterior sheet 13 coated with the adhesive 14, the three-dimensional cushioning material 12 is mainly attached to and sandwiched with the adhesive 14 on the inner peripheral portion 32, and the exterior sheets 13 are bonded to each other by the adhesive 14 on the outer peripheral edge portion 31. When joined, the cushioning sheet 11 is completed.

A test was conducted to verify how the cushioning capacity of the cushioning sheet 11 having the above configuration differs depending on the aspect of the slit 22 of the cushioning material 21.

The test is performed by dropping a chicken egg wrapped in the cushioning sheet 11 from a predetermined height onto a wooden table and confirming whether or not the chicken egg is cracked. The chicken eggs were wrapped in a single layer. Eggs of L size (64 g or more and less than 70 g) were used, and the height of dropping was 5 cm above the table, and the same test piece was subjected to 5 times each.

The material of the cushioning sheet 11 is kraft paper of ^{50 g / m 2} for both the three-dimensional cushioning material 12 and the exterior sheet 13. That is, the material of the cushioning sheet 11 is all vegetable except the adhesive 14.

The slit length L and the slit spacing W of the cushioning material 21 in the test piece are as shown in Table 1 (see FIG. 3). The slit length L was in the range of 2 mm to 60 mm, and the slit spacing W was in the range of 0.5 mm to 15 mm, and the samples were appropriately combined as shown in Table 1.

試験体Ｎｏ．１は、スリット長さＬが２ｍｍで、スリット間隔Ｗが１ｍｍである。つまり、スリット長さＬ：スリット間隔Ｗは２：１であり、いずれの値もＬサイズの鶏卵に比してきわめて小さい。

Specimen No. In No. 1, the slit length L is 2 mm and the slit spacing W is 1 mm. That is, the slit length L: the slit interval W is 2: 1, and both values are extremely small as compared with the L size chicken egg.

Specimen No. In No. 2, the slit length L is 3 mm and the slit spacing W is 1 mm. That is, the slit length L: the slit spacing W is 3: 1, and the value of the slit spacing W related to the thickness of the three-dimensional cushioning material 12 is extremely small as compared with the L size chicken egg.

Specimen No. In No. 3, the slit length L is 5 mm and the slit spacing W is 0.5 mm. That is, the slit length L: the slit spacing W is 10: 1, and the value of the slit spacing W related to the thickness of the three-dimensional cushioning material 12 is extremely small as compared with the L size chicken egg.

Specimen No. In No. 4, the slit length L is 5 mm and the slit spacing W is 1 mm. That is, the slit length L: the slit interval W is 5: 1, and the test piece No. The value of the slit interval W related to the thickness of the three-dimensional cushioning material 12 is twice that of No. 3, but the slit length L related to the opening of the slit of the three-dimensional cushioning material 12 is the test piece No. Same as 3.

Specimen No. In No. 5, the slit length L is 5 mm and the slit spacing W is 2 mm. That is, the slit length L: the slit interval W is 5: 2, and the test piece No. The value of the slit spacing W related to the thickness of the three-dimensional cushioning material 12 is twice that of 4.

Specimen No. In No. 6, the slit length L is 10 mm and the slit spacing W is 2 mm. That is, the slit length L: the slit interval W is 5: 1, and the test piece No. Compared with 4, the values of the slit length L related to the opening of the slits of the three-dimensional cushioning material 12 and the slit spacing W related to the thickness of the three-dimensional cushioning material 12 are both doubled.

Specimen No. In No. 7, the slit length L is 20 mm and the slit spacing W is 5 mm. That is, the slit length L: the slit interval W is 4: 1 and the test piece No. Compared with 6, the value of the slit length L related to the opening of the slit of the three-dimensional cushioning material 12 is twice, and the value of the slit interval W related to the thickness of the three-dimensional cushioning material 12 is 2.5 times.

Specimen No. In No. 8, the slit length L is 35 mm and the slit spacing W is 7 mm. That is, the slit length L: the slit interval W is 5: 1, and the test piece No. Compared with 7, the value of the slit length L related to the opening of the slit of the three-dimensional cushioning material 12 is 1.75 times, and the value of the slit interval W related to the thickness of the three-dimensional cushioning material 12 is 1.4 times. ..

Specimen No. In No. 9, the slit length L is 35 mm and the slit spacing W is 10 mm. That is, the slit length L: the slit interval W is 7: 2, and the test piece No. Only the value of the slit spacing W related to the thickness of the three-dimensional cushioning material 12 was lengthened by 3 mm as compared with 8.

Specimen No. In No. 10, the slit length L is 40 mm and the slit spacing W is 7 mm. That is, the slit length L: the slit interval W is 40: 7, and the test piece No. Compared with 8, only the value of the slit length L related to the opening of the slit of the three-dimensional cushioning material 12 was lengthened by 5 mm, and only the value of the slit spacing W related to the thickness of the three-dimensional cushioning material 12 was shortened by 3 mm.

Specimen No. No. 11 has a slit length L of 50 mm and a slit spacing W of 10 mm. That is, the slit length L: the slit interval W is 5: 1, and the test piece No. Only the value of the slit length L related to the opening of the slit of the three-dimensional cushioning material 12 was lengthened by 15 mm as compared with 9.

Specimen No. No. 12 has a slit length L of 60 mm and a slit spacing W of 10 mm. That is, the slit length L: the slit interval W is 6: 1, and the test piece No. Only the value of the slit length L related to the opening of the slit of the three-dimensional cushioning material 12 was lengthened by 10 mm as compared with 11.

Specimen No. Reference numeral 13 has a slit length L of 50 mm and a slit spacing W of 15 mm. That is, the slit length L: the slit interval W is 10: 3, and the test piece No. The value of the slit length L related to the opening of the slits of the three-dimensional cushioning material 12 was increased by 10 mm, and the value of the slit spacing W related to the thickness of the three-dimensional cushioning material 12 was increased by 5 mm as compared with 12.

In addition, the test body No. No. 13 was not tested because the slit spacing W related to the thickness of the three-dimensional cushioning material 12 was 15 mm, which was bulky and it was difficult to wrap the chicken egg.

The result of the test is the test piece No. In 1, the egg broke in all 5 times. Specimen No. In 2, 3 pieces, test piece No. In 3, 5 pieces, test piece No. In 4, two pieces, the test piece No. No. 11 is one, and the test piece No. At 12, four eggs broke.

On the other hand, the test piece No. From No. 4 to the test piece No. At 10, the egg did not break even once.

From this result, it can be seen that when the slit spacing is less than 1 mm and the slit length is less than 3 mm, it is difficult to use as a cushioning material for chicken eggs (test body No. 1 and test body No. 3). This means that the test piece No. 4 and test piece No. It can be seen from the contrast of 5. That is, the test piece No. 4 and test piece No. The slit length L of 5 is 5 mm, but the slit spacing W is the same as that of the test piece No. No. 4 is the test piece No. Half of 5 is 1 mm. Specimen No. In No. 5, there was no broken egg, whereas the test piece No. In 4, two pieces are broken.

Further, the test piece No. in which the ratio of the slit length L and the slit spacing W is 5: 1. Comparing the results of 4, 6, 8 and 11, the buffering function is recognized, but the value of the slit interval W is small. In 4, 2 out of 5 eggs broke. Further, the test piece No. having a large value of the slit length L. At 11, one egg broke. From this, it can be seen that the buffer function deteriorates when either the slit length L or the slit interval W is smaller than a certain range or larger.

Although it is not clear from the test results, if the slit spacing exceeds 10 mm, it is too bulky as a cushioning material. If the slit length exceeds 50 mm, it is unlikely to serve as a cushioning material for chicken eggs.

From these results, the slit spacing W of the cushioning material 21 in the cushioning sheet 11 is preferably about 1 to 10 mm, preferably about 1 to 8 mm, and the slit length L is about 3 to 50 mm, preferably about 5 to 35 mm. It is preferable to have it.

The cushioning sheet 11 having the above configuration is used by wrapping an article or packing it between an article and a container at the time of packing or wrapping. When wrapping or stuffing, it may be folded or rolled as needed, or any unnecessary parts may be excised.

Since the cushioning sheet 11 has a structure in which both sides of the three-dimensional cushioning material 12 are sandwiched between the exterior sheets 13, the form of the three-dimensional cushioning material 12 is maintained, and the cushioning function can be provided simply by wrapping or packing. It can be demonstrated and is easy to handle. Moreover, since the three-dimensional cushioning material 12 is made of a paper-based material and the exterior sheet 13 is derived from a plant, it can be discarded as paper when it is not needed, and it is easy to handle from this point as well.

The above configuration is one embodiment for carrying out the present invention, and the sheet material of the present invention corresponds to the cushioning material 21 described above, but the present invention may adopt other configurations.

For example, the three-dimensional cushioning material 12 may be something other than the one that is three-dimensionalized in a honeycomb shape.

Further, if the exterior sheet 13 has a breathable material or has a ventilation hole or a notch (window), it may be suitable for packing articles sensitive to stuffiness, for example. can.

A plurality of three-dimensional cushioning materials 12 may be stacked and provided.

In the above example, the exterior sheet 13 is shown as one in which two sheets are bonded together. For example, one exterior sheet 13 may be folded in half and a three-dimensional cushioning material 12 may be provided therein.

The three-dimensional cushioning material 12 and the exterior sheet 13 can be joined by welding or the like.

In addition to being used as a sheet, the cushioning sheet 11 can also be assembled into a form such as an envelope and used as a packing material for an envelope or the like.

11 ... Cushioning sheet 12 ... Three-dimensional cushioning material 13 ... Exterior sheet 21 ... Cushioning material 22 ... Slit

Claims (3)

A cushioning sheet composed of a sheet-shaped three-dimensional cushioning material made of a paper-based material and a plant-derived exterior sheet sandwiching both sides of the three-dimensional cushioning material. The cushioning sheet according to claim 1, wherein the plant-derived component in the exterior sheet is 90% or more. The three-dimensional cushioning material stretches and three-dimensionalizes a sheet material in which a large number of slits extending in one direction are arranged in a staggered pattern.
The cushioning sheet according to claim 1 or 2, wherein the distance between the slits is 1 mm or more and 10 mm or less, and the length of the slits is 3 mm or more and 50 mm or less.

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