JPH06100033A - Corner pad - Google Patents

Abstract

PURPOSE:To improve the environmental conservation property and manufacturing property by a method wherein for a corner pad for box packing of electric appliances, etc., an orthogonal 3-wall part is formed using a composite sheet of a rigid sheet and cushioning sheet, and a reinforcing rib is formed on the surface and side edge of respective wall parts, and at the periphery of a dish- shaped part at the center of the wall part, and also fitting means for corresponding two walls are provided. CONSTITUTION:A composite sheet is formed by laminating a cushioning sheet consisting of a polyolefine expanded sheet, and a rigid sheet made of polyolefine containing a bulking agent. A corner pad raw material, for which square-shaped sheet pieces (1a)-(1c) are connected into an approximate hook-shape, is formed by vacuum-molding the composite sheet. These 3 pieces (1a)-(1c) are connected by a tilted surface 4 by 45 deg., and respectively erected by a folding line 3, and a corner pad with orthogonal 3 walls is formed by fitting a protruding wall part 4 in a recessed wall part 5. A dish-shaped part 6 is provided at the center of respective sheet pieces (1a)-(1c), and at the same time, a dish-shaped reinforcing rib 7, surface reinforcing rib 8 and peripheral edge reinforcing rib 9 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corner pad for abutting and protecting a corner portion or a corner and a corner ridge between corners when a home electric appliance or the like is packed in a box.

[0002]

2. Description of the Related Art Conventionally, a molded product made of expanded polystyrene has been used as a corner pad. Although it has a good protective effect, it itself has a very large bulk volume.
It is uneconomical in terms of physical distribution costs, and has a difficult problem in waste disposal after use due to environmental protection measures. In order to improve these problems, actual Kaihei 1-888
In Japanese Patent No. 75, there is proposed one in which a film having bubble particles enclosed therein is integrally polymer-bonded to a bonded substrate which is formed so as to be capable of being folded up so as to form three orthogonal planes. However, this product has a complicated manufacturing process and requires special manufacturing equipment.

[0003]

The present inventor, unlike the above-mentioned structure, studied a method of forming a sheet by vacuum forming or pressure forming, and folding this sheet to form a corner pad, which is suitable for this. The present invention has been completed through repeated research on the shape and composition of the material.

[0004]

According to the present invention, a dish-shaped portion is formed by folding and forming a corner pad consisting of three orthogonal wall portions, and provided on the surface, side edge and each wall portion of each wall portion. A molded sheet provided with ridge-shaped reinforcing ribs on the periphery and detachable fitting means between corresponding sides of corresponding two walls to be coupled to each other, the sheet being a composite of a rigid sheet and a cushioning sheet. A corner pad is provided that is made of a sheet.

The shape of the first embodiment of the corner pad according to the present invention will be described. 1 is a plan view of the first embodiment before folding, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a perspective view after folding and coupling. The corner pads are substantially square sheet pieces 1a, 1b,
Three sheets 1c are arranged in a hook shape, and the adjacent portions of the sheet pieces adjacent to each other form the inclined surface 2 of 45 degrees, and the intersecting line of the inclined surfaces acts as the valley fold line 3 at the time of assembling the corner pad. Further, the convex wall portion 4 is provided on the inclined surface 1c of the sheet pieces 1a and 1c to be coupled to each other, and the concave wall portion 5 is provided on the la,
As a fitting means at the time of assembling the corner pad, the convex wall portion and the concave wall portion are mutually detachably fitted by friction between the surfaces, or the concave wall portion and the concave wall portion are fitted with each other. A set of protrusions may be provided, or the inclined a-planes, c
Common strip-shaped notch claws are provided at the corresponding locations on the surface,
You may make it contact | abut the inclined surface of a surface and c surface, and may make it not disengage by bending the said nail | claw inward. In order to reinforce the pad after assembly, the seat is provided with a dish-shaped portion 6 at the center of each surface 1a, 1b, 1c, and a convex strip-shaped reinforcing rib 7 is formed on the dish-shaped flying wall. Further, a convex-shaped surface reinforcing rib 8 and a peripheral reinforcing rib 9 are provided on the surface and outer peripheral edge of each surface. The number of these reinforcing ribs and the size of the ridges are appropriately selected according to the size of the device to be protected, the rigidity of the sheet, the thickness, and the like.

Next, the shape of the second embodiment of the corner pad of the present invention will be described. This protects the equipment by abutting on the left and right corners or the upper and lower corners of the equipment and the corner ridges between these corners. FIG. 4 is an expanded view of FIG.
[Fig. 3] is a perspective view after the assembly. As for how to use,
After cutting along the cutoff line 11, the horizontal plane, the back surface, and the left and right side surfaces are joined together, and the remaining pieces are pushed and overlapped behind the folded side wall surface. The fitting means for connecting the horizontal surface and the side wall, the dish-shaped portion, the surface, and the reinforcing ribs on the peripheral edge are the same as those in the first embodiment, and the description thereof will be omitted.

This corner pad is formed by vacuum forming or pressure forming of a composite sheet consisting of a rigid sheet and a cushioning sheet. The rigid sheet is obtained by kneading a polyolefin resin with an inorganic filler. As the polyolefin resin, polypropylene, propylene / ethylene copolymer (99 to 50% by weight of propylene, balance ethylene) and high density polyethylene are used, and the thickness is from 0.6 to
The range of 1.0 mm is suitable from the viewpoint of strength and economy.

The inorganic filler is added in an amount of 5 to 50 parts by weight, preferably 30 to 40 parts by weight, based on 100 parts by weight of the above resin. When the amount is 5 parts by weight or less, the rigidity is insufficiently expressed, and when the amount is 50 parts by weight or more, it becomes brittle, and preferably 30 to 4
0 parts by weight. As the inorganic filler, talc, mica, calcium carbonate, white carbon, barium sulfate, aluminum hydroxide or the like is used, and the rigidity is different depending on the type of each filler, so that selection is also made in consideration of this point.

As the cushioning sheet, low density polyethylene, linear low density polyethylene, and ethylene / vinyl acetate copolymer are preferably used in addition to the above polyolefin foam. Foaming ratio of 1.1 for polyolefin foam
It is used in a range of from 2.0 to 2.0. When it is 1.1 times or less, the buffering property is poor, and when it is 2.0 or more, the uniform foaming property is poor, and preferably 1.3 times to 1.5 times. The ethylene / vinyl acetate copolymer has a melt index of 3 to 14 g /
A material having a vinyl acetate content of 6 to 15% for 10 min and a hardness (Shore D) of 34 to 38 is preferably used, and the thickness thereof is in the range of 50 to 100 μm.

As the composite sheet, a two-layer structure of an olefinic foam layer of the buffer layer and an inorganic filler-kneading polyolefin rigid layer, or a three-layer structure of the buffer layer with the above-mentioned rigid layers laminated on both sides is used. To be In addition, low-density polyethylene, ethylene-vinyl acetate copolymer sheets are used to soften the surface and impart buffering properties to equipment.
A two-layer structure with a filler-kneaded polyolefin, or a three-layer structure with a filler-kneaded polyolefin in the middle and a buffer sheet laminated on both sides is used. These sheets are co-extruded as a two-layer or three-layer composite sheet by an extruder and molded by a vacuum molding method or a pressure molding method using a corner pad molding die.

[0011]

Since the corner pad according to the present invention is formed of a composite sheet of a rigid sheet and a cushioning sheet, the corner pad, together with the structure having the reinforcing rib, exhibits sufficient protection performance as a corner pad for home electric appliances and the like. Further, since the fitting means for assembling is provided, the coupling portion does not easily come off, and the assembling work is not hindered. It can be conveyed as an unfolded sheet and returned to the sheet for processing after use. Further, by using a polyolefin-based material, it is possible to handle incineration.

[0012]

Example: 100 parts of polypropylene and 4 parts of calcium carbonate
A mixture of 0 parts by weight and a thickness of 1.0 mm and an ethylene / vinyl acetate copolymer having a melt index of 5 g /
A product having a vinyl acetate content of 8% and a thickness of 100 μm was coextruded for 10 minutes, and a corner pad was formed by a vacuum forming method using the forming die shown in FIG. The buckling strength of this product was measured by a universal tensile tester, and was found to be 250 kg.
The value of f was shown and it was shown to have sufficient strength as a corner pad.

[0013]

According to the present invention, it is possible to convey by stacking,
Also, after use, it can be spread and stacked and transported, so unlike polystyrene foam products, physical distribution costs can be significantly reduced, and when treated as waste, it can be incinerated, so there is little impact on the environment, etc. It has the characteristics of.

[Brief description of drawings]

FIG. 1 is a plan view of a developed version of the first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II in FIG.

FIG. 3 is a perspective view of the first embodiment of the present invention after assembly.

FIG. 4 is a plan view of a developed version of the second embodiment of the present invention.

FIG. 5 is a perspective view of the second embodiment of the present invention after assembly.

[Explanation of symbols]

 1a, 1b, 1c Sheet piece 2 Inclined surface 3 Valley fold line 4 Convex wall portion 5 Concave wall portion 6 Dish-shaped portion 7 Dish-shaped portion reinforcing rib 8 Surface reinforcing rib 9 Peripheral reinforcing rib 11 Cut-and-released line

Claims (3)

[Claims] 1. A corner pad is formed by folding up to form three orthogonal wall portions, and ridge-shaped reinforcing ribs are provided on the surface of each wall portion, a side edge, and the periphery of a dish-shaped portion provided on each wall portion. A corner pad, characterized in that it is a molded sheet provided with detachable fitting means between corresponding sides of the corresponding two walls to be coupled to each other, the sheet being a composite sheet of a rigid sheet and a cushioning sheet. . 2. A composite sheet in which the composite sheet is formed by laminating a cushioning sheet made of a polyolefin foam sheet and a rigid sheet made of a filler-containing polyolefin, or a filler-containing polyolefin sheet is laminated on both sides with the polyolefin foam sheet sandwiched therebetween. The corner pad according to claim 1, wherein the corner pad is a composite sheet. 3. A composite sheet obtained by laminating a rigid sheet made of a filler-containing polyolefin on a buffer sheet made of an ethylene / vinyl acetate copolymer sheet or a low density polyethylene, or a filler-containing polyolefin sheet. The corner pad according to claim 1, which is a composite sheet in which an ethylene / vinyl acetate copolymer sheet or a low density polyethylene sheet is laminated on both sides of the sheet sandwiched therebetween.