JPH0986566A - Cushioning material for packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce any risk of collapse of cargoes during transportation by a method wherein cylindrically formed films are sealed alternately so that the films intersect each other at right angles to obtain triangles each having four faces so that the triangles, two by two, have nearly the same shape except that all the triangles have the same shape, whereby the triangles, as wedges, can be easily inserted into a gap between objects to be packaged. SOLUTION: A cushioning material 1 for packaging is constituted of a back seal 12 for keeping a film 10 cylindrical and two kinds of seals for sealing the cylinder in the width direction, i.e., longitudinal seal 11 and transverse seal 13. The seals 11 and seals 13 are not perpendicular to the cylinder, but are inclined and sealed. Two of four faces of a triangle pyramid obtained each have the same triangular shape. Thus triangles A are made the mirror images of trianles B and they are alternately connected in a chain form. And they are separated along a perforation and the bodies A and B are combined, three by three, to form a cube. And if the bodies A and B, connected in series, are used as fillers, number of them can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning body for packaging which is used for cushioning impacts and filling voids during packaging.

[0002]

2. Description of the Related Art When packing precision machinery or trash,
An air cushion is used. Some of these air cushions are called bubble sheets, and some have a relatively large air enclosure. In both cases, plastic was used as the membrane material.

The present invention relates to the latter improvement, and hereinafter, these will be simply referred to as "buffer bodies". Conventional "buffer"
Was made by sealing a plastic film on three sides with a modified pillow packaging machine. Therefore, the back seal was literally on the back. Further, there is a case where a triangular pyramid is formed by heat sealing in a direction orthogonal to the middle of the bottom seal portion and the top seal portion.

[0004]

The "buffer" is an excellent packaging material with a low environmental load in terms of easy volume reduction, and the bulk density of the used raw material to the "buffer" is high. Considering the changes, it was a very efficient, lightweight, resource-saving packaging buffer, and because it was transparent, it was possible to easily discriminate the object to be packaged.

However, these "buffers" are not limited to pillow-shaped ones as the basis, but also those which form a triangular pyramid by heat-sealing in the direction orthogonal to the middle of the bottom seal portion and the top seal portion. However, when sitting in a plurality of seats, the sitting is extremely bad, and this is a big problem in packaging work.

Furthermore, since the conventional cushioning body has a smooth surface, it is slippery during use, and when used as a filling material for the package void, "load slip" easily occurs, and the objects to be packaged and the objects to be packaged. When inserting it as a "wedge" into the gap, there was another problem that it was difficult to slip in or easily slipped out (it was pushed back). Further, when plastic is used as the material, the burden of post-treatment such as disposal and incineration becomes large, and improvement in terms of material has been desired if possible. The present invention intends to solve all the problems of the conventional "buffer" in one stroke.

[0007]

[Means for Solving the Problems]

[0008]

[Figure 1]

[0009]

FIG. 2

[0010]

FIG. 3

[0011]

FIG. 4

[0012]

FIG. 5

[0013]

FIG. 6

FIG. 1 shows an embodiment of the present invention. As described above, the cushioning body 1 for packaging of the present invention is composed of the back seal 12 that makes the membrane 10 into a tubular shape, and the two types of vertical seals 11 and 13 that seal the tube in the width direction. There is. Unlike the conventional triangular pyramid type shown in FIG. 2, the vertical seal 11 and the horizontal seal 13, which are two types of seals that seal in the width direction, are sealed at an angle rather than at a right angle to the cylinder.

The inclination angle θ1 of the vertical seal 11 and the inclination angle θ2 of the horizontal seal 13 of the two types of seals for sealing in the width direction are 0 ° <θ1 (or θ2) ≦ 90 °, preferably 15 ° < θ1 (or θ2) ≦ 60 °, more preferably 20 ° <θ1 (or θ2) ≦ 30 °.

Further, from the perspective of the shape of the obtained "buffer", the shape of each of the four faces (that is, the triangles) of the triangular pyramid (that is, the tetrahedron) is the same triangle in twos. Among them, it is preferable that the two sets of triangles are right triangles. Furthermore, it is preferable that one of the two sets of right triangles is a right-angled isosceles triangle as shown in the developed view of FIG. According to the research conducted by the inventors, the ideal ratio of the sides from the measured value is as shown in FIG. 3, isosceles right triangle = 1: 1: √2, right triangle = 1: √2: √. It becomes 3.

Further, as shown in FIG. 4, perforations 14 may be provided at the center of both the vertical seal 11 and the horizontal seal 13 or one of the seal faces, if necessary. If it has such perforations, it can be easily cut into an arbitrary size, so that it can be used in a wide range such as wrapping or as a stuffing. Further, if the notch 15 for reducing the volume is provided in the back seal portion 12, post-processing becomes easy.

As described above, the vertical seal 11 and the horizontal seal 13 of the two kinds of seals for sealing in the width direction are
By sealing with a seal bar that is fixed not at a right angle to the cylinder but at an angle, a mirror image symmetric structure is alternately arranged in a chain as shown in FIGS. 1 and 4A and 4B. Cut this off at the perforation, and as shown in Fig. 5, A
It is also possible to form a cube by combining three bodies and three B bodies each. If the conventional triangular-pyramidal "buffer" is used, such a stable shape cannot be expected.

Contrary to this, as shown in FIG.
If the B body is rolled in a series, it will not stick to each other like the conventional "buffer", and it will be stable in a shape with a gap left after rolling, so it will be used as a filling. When used, the number of pieces can be greatly saved.

As the film material, it is preferable to use synthetic resin or paper. In the case of synthetic resin, polyethylene, P
In order to improve gas barrier properties such as ET (polyethylene terephthalate), a multi-layer film such as polyethylene / nylon may be used. In addition, considering post-treatment such as disposal, PCL (polycaprolactone), PV
Biodegradable synthetic resins such as A (polyvinyl alcohol), polylactic acid, and fatty acid polyester are preferable.

Further, in order to reduce the environmental load in the treatment after the volume reduction, it is most rational to make the membrane material into a material that can be easily material-recycled. Plastic is technically a material that can be easily recycled, but since the collection system has not yet been established, it is the actual situation that it is sent to landfills and other waste. Material that can be easily recycled
The first candidate the inventors have mentioned is paper. If it is paper, it is possible not only to put it on the route of material recycling after use, but also to use already recycled material, that is, used paper from the beginning.

However, the use of commercially available paper has the following three major problems. First, the film strength is too weak. Especially, the tear strength is too weak. Second, heat sealing is not possible. Even if it can be sealed with starch paste or the like, it is difficult to mechanize, and even if it can be mechanized, the productivity is low. Low productivity means
In the meantime, it consumes a lot of energy, which goes against the main purpose of development to reduce the environmental load. Third, it is weak against water. Due to the above three problems, it is not possible to solve the problem by using commercially available paper. In order to solve these problems, a means of using polyethylene coated on paper is considered next. However, this material gets caught in the material recycling stage. It is technically impossible to recycle waste paper that has been coated with polyethylene as paper.

The inventors have solved the above three problems,
Moreover, a water-soluble polymer and a decomposable resin (hereinafter referred to as a water-soluble polymer) were selected from many substances as materials that do not impair material recycling. Water-soluble polymers include gelatin, glue, agar, gum arabic, casein,
Pectin, alginate, tragacanth gum and other natural polymers. Polyvinyl alcohol, polycaprolactone, polyethylene oxide, polyvinylpyrrolidone, sodium polyacrylate, polyacrylamide, polymethacrylic acid,
Polyitaconic acid, polyethylene oxide, polyvinyl methyl ether and other synthetic polymers. Alternatively, it is difficult to form a homopolymer such as maleic acid, fumaric acid, crotonic acid, or aconitic acid, but it is copolymerized with other components to form a water-soluble or hydrophilic copolymer. Semi-synthetic polymers such as methyl cellulose, carboxymethyl cellulose (CMC), hydroxyethyl cellulose, soluble starch. and so on.

Particularly, in the case of synthetic polymer coated paper, both the film strength and the heat sealing strength are sufficient, and the water resistance can be obtained to some extent by selecting the saponification degree, the transformation degree and the polymerization degree. In particular, it is obtained by reacting an alkylene oxide addition-polymerized polyalkylene glycol compound containing ethylene oxide with an organic compound having two active hydrogen groups and a divalent carboxylic acid, its anhydride or its lower alkyl ester. When the water-soluble polymer is used, the heat seal strength is good. Next, it is suitable for material recycling, but it is very compatible with paper, as is clear from the fact that part of the water-soluble polymer is added as a thickener in the papermaking process. Since it is water-soluble, it can be directly added to the pulper (defibration tank) and does not need to be removed by a floatator (clarification tank). Polyvinyl alcohol and the like can be biodegraded in soil if the degree of saponification, the degree of modification and the degree of polymerization are selected. By increasing the saponification degree, it becomes difficult to dissolve in cold water.
8 mol% or less is desirable, saponification degree 80-95 mol
% Is more desirable.

The polylactic acid includes poly L-lactic acid and poly D-lactic acid, and these may be used alone or in combination. The mixture of poly (L-lactic acid) and poly (D-lactic acid) has lower crystallinity and higher flexibility than that of a single substance, and thus is suitable for the packaging buffer body of the present invention. Further, since polylactic acid has low gas permeability, its use is preferable also from the viewpoint of maintaining the air chamber in the buffer.
Further, those which are soluble in an alkaline aqueous solution and those which are decomposed by water or an alkaline aqueous solution are also included in these water-soluble polymers in a broad sense. CMC and the like are more easily dissolved in alkaline aqueous solution than water, and polylactic acid is easily dissolved in alkaline aqueous solution. Therefore, it is necessary to use the alkaline aqueous solution in the process from the viewpoint of paper recycling and papermaking. Is preferred.

The coating method of "water-soluble polymer etc." includes emulsion coating, extrusion coating and the like. If an alkylene group-containing water-soluble polymer is used, extrusion coating is easy. These “water-soluble polymers and the like” may be used alone or as a mixture of two or more, if necessary,
In some cases, it may be used as a mixture with another synthetic resin.
For example, nylon-6, which is poorly soluble in water and known to be difficult to decompose, is mixed with polylactic acid, and lactic acid produced by hydrolysis of polylactic acid acts as a catalyst for decomposition of nylon-6. However, it is known that deterioration of nylon-6 is accelerated. As is well known, nylon-6 has excellent gas barrier properties, so nylon-6
The gas barrier property of polylactic acid can be enhanced and the decomposability of lactic acid can be maintained by mixing with.

Compared with the conventional triangular-pyramidal buffers, these packaging cushions are less slippery when they are inserted as "wedges" in the gaps between the articles to be packaged, if paper is used as the film material. , Easy to insert. Since the friction coefficient between the "buffers" is slightly increased, the problem of load shift during transportation is alleviated. Further, if a "water-soluble polymer or the like" is applied to the outer surface regardless of the material such as synthetic resin or paper, it becomes more slippery. If a self-adhesive adhesive such as rubber latex or a removable adhesive is used as the coating agent on the outer surface instead of "water-soluble polymer", not only it becomes easier to insert, but also the "buffer" Since the coefficient of friction is remarkably increased, the problem of load deviation during transportation is solved. Also at this time, the problem of stickiness and dirt of the packaged object does not occur. Further, the problem of water resistance when paper is used as the film material is completely solved.

If the rubber latex is applied sufficiently thinly, it can be crushed in a pulper (defibration tank), and in the emulsion state as it is, it does not matter even if it shifts to the papermaking process. If pulverization is insufficient and a large film remains, it can be removed with a floatator (clarification tank). In addition, gum arabic is a type of "water-soluble polymer" and is not a problem.

For the purpose of only increasing the friction coefficient of the surface, rubber latex may be coated on the plastic surface. However, rubber latex is usually applied in the form of a water emulsion, and plastic is not water-absorbing, so application is possible but difficult. It is effective only when combined with paper.

[0029]

[Operation] As described above, 1. If paper is used as the material of the membrane, material recycling will be possible in a practical sense, and the treatment after volume reduction will be easier. Further, if a synthetic resin is used, the contents can be discriminated because it is transparent like the conventional triangular pyramidal buffer. Further, if a decomposable resin is used, post-treatment such as burying in soil becomes easy. 2. Unlike the conventional triangular-pyramidal buffers, these packaging cushions can be formed by combining a total of six mirror-image-symmetrical triangular pyramids that are alternately arranged to form a substantially perfect cube. 3. Compared with the conventional triangular-pyramidal buffers, these packaging buffers are very bulky when they are rolled up in a continuous state, so that the amount used when filling the gaps can be reduced. 4. Providing a volume reducing notch on the sealing surface of the back seal facilitates volume reduction after use. 5. If "a self-adhesive adhesive or a removable adhesive is applied to the whole outer surface or a part of the film", it becomes extremely difficult to pull it out when it is inserted as a "wedge" into the gap between the objects to be packaged. Also, the problem of load gap is completely solved.

[0030]

Example 1 A buffer body of the present invention having the shape shown in FIG. 4 was made by using polyethylene / 6-nylon = 40 μ / 10 μ. The size of this cushioning body was such that the width of the cylinder was 50 mm, the vertical seal portion 11 had an inclination angle θ1 = 23 °, and the horizontal seal portion 13 had an inclination angle θ2 = 23 °.

[0031]

[Embodiment 2] The cushioning body of the present invention having the shape shown in FIG.
It was made by using a coated paper in which a water-soluble polymer or the like having an average of 15 microns was applied to kraft paper of 7 g / square meter. Polycaprolactone was used as the “water-soluble polymer and the like”. φ40 mm, L / D = 2.8, CR = 4.0
Extrusion coating was carried out from a manifold type T die by using the Ex. The size of this cushion is 50 m width
m, the inclination angle θ1 of the vertical seal portion 11 = 23 °, and the inclination angle θ2 of the horizontal seal portion 13 = 23 °, the respective seal widths were 10 mm.

[0032]

Comparative Example 1 A regular tetrahedral triangular pyramidal buffer made of a multilayer film of outer layer polyethylene terephthalate 12 μm / inner layer polyethylene 30 μm was used as a comparative example. At this time, the length of the back seal portion was 42.5 mm, the length of the vertical direction seal portion was 50 mm, the length of the horizontal direction seal portion was 50 mm, and each seal width was 10 mm.

[0033]

[Table 1]

[0034]

[Load gap test] Dimensions 400 mm x 300 mm, height 30
300 mm x 200 mm in a 0 mm cardboard outer box
A dummy of contents of × 200 mm and a weight of 5 kg was put into the space, and the buffer bodies of Examples 1 and 2 and Comparative Example 1 were continuously connected to the gap, and those disassembled at the perforation were prepared and put into the respective spaces. It was put in as much as possible, the outer box was sealed, and the container was vibrated for 2 hours under the conditions of an amplitude of 20 mm and a frequency of 400 cycles / min, and the difference in the gap between the outer box and the contents before and after the test was examined. Table 1 shows this result and the number of buffers used for packing.

[0035]

[Test Results] As can be seen from the results in Table 1, when the buffers of the present invention of Examples 1 and 2 were used in a continuous state, about 70% of the amount used in Comparative Example 1 of the prior art buffer was used. It was also found that the load shift was small. Also,
When disassembled from the perforations, the amount of use was almost the same, but the stability when combined was good, so the load shift was smaller than in Comparative Example 1 of the conventional buffer body. Further, the buffer of Example 2 lost transparency due to its material, but compared with the synthetic resin-based buffers of Example 1 and Comparative Example 1, the buffer had substantially the same dimensions. It was confirmed that by increasing the friction coefficient, the amount of the cushioning body itself was saved, and the performance as a cushioning body such as a reduction in load shift was improved.

[0036]

【The invention's effect】

1. If paper is used as the material of the membrane, material recycling will be possible in a practical sense, and the treatment after volume reduction will be easier. Further, if a synthetic resin is used, the contents can be discriminated because it is transparent like the conventional triangular pyramidal buffer. Further, if a decomposable resin is used, post-treatment such as burying in soil will be easy. 2. Unlike the conventional triangular-pyramidal buffers, these packaging cushions can be formed by combining a total of six mirror-image-symmetrical triangular pyramids that are alternately arranged to form a substantially perfect cube. 3. Compared with the conventional triangular-pyramidal buffers, these packaging buffers are very bulky when they are rolled up in a continuous state, so that the amount used when filling the gaps can be reduced. 4. Providing a volume reducing notch on the sealing surface of the back seal facilitates volume reduction after use. 5. If "a self-adhesive adhesive or a removable adhesive is applied to the whole outer surface or a part of the film", it becomes extremely difficult to pull it out when it is inserted as a "wedge" into the gap between the objects to be packaged. Also, the problem of load gap is completely solved. When the paper coated with the water-soluble polymer was used for the film, the following three problems could be solved, unlike the case where the plastic was simply replaced by the paper in the conventional "buffer". B, the film strength is too weak. Especially, the tear strength is too weak. B, heat sealing is impossible. Even if it can be sealed with starch paste or the like, it is difficult to mechanize, and even if it can be mechanized, the productivity is low. The low productivity means that much energy is consumed in the first place, which is contrary to the main purpose of development, which is to reduce the environmental load. Ha, sensitive to water. 6. When CMC or lactic acid is used as the water-soluble polymer, CMC is more easily dissolved in an alkaline aqueous solution than water, and polylactic acid is easily dissolved in an alkaline aqueous solution. Therefore, in the process, regeneration of paper using the alkaline aqueous solution is inevitable. ,
From the viewpoint of paper making, its use is preferable. 7. Further, by mixing nylon-6 with the lactic acid, nylon-6 is known to be difficult to decompose. However, by mixing it with polylactic acid, lactic acid generated by hydrolysis of polylactic acid can decompose nylon-6. It acts as a catalyst and accelerates the deterioration of nylon-6. That is, by mixing nylon-6, the gas barrier property of polylactic acid can be enhanced and the decomposability of lactic acid can be maintained. This is also true when nylon is used when the membrane is synthetic resin.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the buffer body of the present invention.

FIG. 2 shows a conventional triangular pyramidal buffer.

FIG. 3 is an example of a developed view of the buffer body of the present invention.

FIG. 4 shows another embodiment of the buffer of the present invention.

FIG. 5 is an example of forming a cube from three pairs of buffer bodies of the present invention having a mirror image symmetry relationship.

FIG. 6 shows a state in which the buffer body of the present invention is rolled while being connected. .

[Explanation of symbols]

 1 Packaging Buffer of the Present Invention 10 Membrane 11 Vertical Sealing Part 12 Back Sealing Part 13 Lateral Sealing Part 14 Perforation 15 Notch A Mirror Image Symmetrical One B Mirror Image Symmetrical Other θ1 Vertical Seal 11 Inclination Angle θ2 Horizontal Direction Inclination angle of seal 13

Claims (14)

[Claims] 1. A tetrahedron having a gas chamber inside, which is formed by a four-sided triangle obtained by alternately sealing a tubular film so as to be substantially orthogonal to each other. A packaging cushion, wherein two triangles each have substantially the same shape except when all the triangles have the same shape. 2. The cushioning body for packaging according to claim 1, wherein the two pairs of triangles are substantially right triangles. 3. The packaging cushion according to claim 2, wherein one of the two pairs of triangles is an isosceles right triangle. 4. The packaging cushion according to claim 1, wherein perforations are provided in parallel with the sealing portion when sealing the tubular film. body. 5. The cushioning body for packaging according to claim 1, wherein the film is a synthetic resin film. 6. The packaging cushion according to claim 5, wherein the synthetic resin film is a multilayer film. 7. The packaging cushion according to claim 5, wherein the synthetic resin film is a degradable resin film. 8. The packaging cushioning body according to claim 1, wherein the film is paper. 9. The cushioning body for packaging according to claim 8, wherein the film is a degradable resin-coated paper. 10. The cushioning body for packaging according to claim 9, wherein the paper is polyvinyl alcohol coated paper. 11. The cushioning body for packaging according to claim 9, wherein the paper is polycaprolactone-coated paper. 12. The packaging cushion according to claim 9, wherein the paper is polylactic acid coated paper. 13. The packaging according to any one of claims 1 to 12, wherein a self-adhesive adhesive or a removable adhesive is applied to the entire outer surface or a part of the film. Buffer. 14. A self-adhesive adhesive or a removable adhesive is
14. The packaging cushion according to claim 13, which is a rubber latex.