JPH0811248A - Manufacture and device of paper board cushioning material - Google Patents

Abstract

PURPOSE:To make it hard to develop tire breakage of folds and easily obtain a cushioning material, the shape of which is complicated and the quality of which is uniform, by a method wherein the margins to paste up of a paper board under the condition being arranged between a top mold and a bottom mold, at least either one of which is heated, are folded down so as to overlap with side wall and, at the same time, uneven part is formed on the surface of the paper board. CONSTITUTION:Paper board l is three-dimensionally assembled with a top mold 21. and a bottom mold 22. In addition, margins to paste up and side walls are provided in the paper board 1. Further, in order to fold down the margins to paste up of the paper board l, pins 21a are provided on the top mold 21. The pins 21a are hold respectively in the pin holes 22b provided on the bottom mold 22. A hotmelt type adhesive is applied in advance on margin parts to paste up contacting the side wall. Furthermore, at least either one of the top and bottom molds is heated up to 100-200 deg.C. The heating makes the paper board easy to bend and also effectively hard to break.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cushioning material using paperboard (including corrugated paper), and an apparatus suitable for manufacturing the same.

[0002]

2. Description of the Related Art An object to be packaged having a low impact resistance is, without exception, fixed with a cushioning material at both ends, for example, and is accommodated in a case as it is. Conventionally, the cushioning material has been manufactured using a foamed resin such as Styrofoam as a raw material so as to match the packaging form. FIG. 9 shows an example thereof.

However, the cushioning material made of foamed resin is (i) difficult to reuse after its use. (Ii) The prescription by combustion has a high heat capacity at the time of incineration and damages the furnace, and is toxic in some cases. Recently, a cushioning material using a paperboard has been widely used because some gas is generated and (iii) the volume does not corrode significantly.

In order to process a paperboard into a three-dimensional shape like a foamed polystyrene molded product, it is actually difficult to avoid complicated bending and sticking. Due to this difficulty, the cushioning material made of paperboard has to rely on human labor, which is not suitable for mass production and the quality is not stable. FIG. 10 shows an example of the cushioning material manufactured by using the styrofoam cushioning material shown in FIG. 9 instead of the paperboard. Here, a paperboard 91 having a recess is attached to the outer paperboard 92. .

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to manufacture a three-dimensional paperboard cushioning material having a uniform quality in a short time by mechanically bending the paperboard, and an apparatus suitable for this manufacturing method. Is provided.

[0006]

The first object of the present invention is to manufacture a cushioning material having a three-dimensional structure by folding a paperboard and fixing the required parts, and in the expanded state before assembling and at the necessary parts, cuts or spaces. A paperboard provided with a section is prepared, and this is placed in a mold having an upper mold and a lower mold, at least one of which is heated, and the upper mold is lowered or the lower mold is raised, It is characterized in that the side wall is overlapped with the glue allowance while bending the glue allowance of the paperboard, and at the same time an uneven portion is formed on the surface.

A second aspect of the present invention is an apparatus for producing a paperboard cushioning material, which has a set of an upper mold and a lower mold, at least one of which can be heated, and the upper mold has When the upper die is lowered or the lower die is raised and the lower die is bent, a pin hole or a protrusion is provided to bend the board corresponding to the glue margin in advance. The lower die is provided with a pin hole or a recess for accommodating the pin.

The present invention will be described in more detail below with reference to the accompanying drawings. FIG. 1 is a perspective view of an example of a paperboard cushioning material manufactured by the method of the present invention. The paperboard cushioning materials mentioned here are those of a toner cartridge used in electrophotographic development. Therefore, from this point on, this FIG.
The method for manufacturing the paperboard cushioning material having the form shown in Fig. 4 and the apparatus suitable for carrying out the manufacturing apparatus will be described, but the paperboard cushioning material is not limited to the toner cartridge. is there. It should be noted that the portion represented by the broken line in FIG. 1 is the glue margin 11, the portion outside the raised portion 12 is the collar portion 13, and the surfaces that overlap or are located outside the glue margin 11 are the side walls 14, 14 '. The horizontal portion connected to the collar portion 13 is referred to as a flat portion 15, and the portion connected to the collar portion 13 or the flat portion 15 and the raised portion 12 is referred to as a vertical portion 16.

As shown in FIG. 2, the paperboard 1 can be punched into a certain shape assuming a state before being three-dimensionally assembled (a developed state). The part surrounded by the solid line in FIG. 2 represents the punched space (O), and the broken line represents the part which is bent when the paperboard 1 is three-dimensionally assembled. Notches may be provided instead of or in addition to the space (O). FIG. 3 is a perspective view of the paperboard shown in FIG.

As shown in FIG. 4, this paperboard is three-dimensionally assembled by a pair of molds consisting of an upper mold 21 and a lower mold 22, and the positional relationship between the paperboard and the molds at the time of assembly. Is shown in FIG. By the way, in order for the paperboard 1 to be three-dimensionally assembled, the glue margin 11 needs to overlap the side wall 14. To this end, the glue strip 11 must be folded before the side wall 14 is folded. Of course, the order of this bending may be reversed, but since the glue margin 11 is usually smaller than that of the side wall 14, it is preferable that the glue margin 11 is bent first. Therefore, when the upper die 21 descends, the glue allowance 11 of the upper paper mold 21 is first bent so that the glue allowance 11 of the paperboard is first bent.
Is provided with a pin 21a (or a protrusion) for bending. The pin 21a is designed to fit in the pin hole 22b (or the depression) of the lower die 22. In FIG. 4, broken lines other than those represented by the pin 21a of the upper mold 21 mean that a recess is formed. Then, the convex portion of the lower die 22 is fitted into the concave portion by sandwiching the paperboard 1. As mentioned above, the pin 21a need not be a pin but may be a suitable protrusion, in which case the pin hole 22
b may be a recess into which the protrusion can fit. Further, the upper mold 21 may be fixed and the lower mold 22 may be moved up, or both of the two molds 21 and 22 may be movable.

In FIG. 5, the corner of the glue margin 11 which is close to the flange 13 is gradually changed by the movement of the mold, and the upper mold 21 and the lower mold 22 are located at the closest position. The state in which the side wall 14 comes into close contact with the outer side of the glue allowance 11 is shown with (a), (b), (c), and (d) over time. 6 (a) and 6 (b) are views of the above-described progress in the oblique direction. FIG. 7 shows the entire mold.

In the method of the present invention, it is desirable that at least the adhesive margin 11 which is in contact with the side wall 14 is pre-coated with an adhesive, and the adhesive is applied to other required places. The adhesive used here still needs to be solidified at the stage when the paperboard is folded by the mold. Even in this state, if the adhesive is not solidified, the adhesive is transferred to an unnecessary portion, which causes an inconvenient phenomenon in which the paperboards, the molds, or the adhesives are bonded to each other. Therefore, it is desirable that the surface of the applied adhesive is hard and has an adhesive function until the time of bending. Therefore, in the present invention, it is advantageous to apply a hot-melt adhesive (nikawa) having a melting temperature of 100 to 150 ° C. as an aqueous emulsion, like flexibly printing ink, by flexographic printing. By doing so, it becomes possible to apply the adhesive evenly to the necessary places. This adhesive functions as an original adhesive when the temperature is set to about 150 ° C., but at a general temperature (20 to 30 ° C.), the surface is hard and does not stick to each other even when stacked and good workability can be obtained. .

Since a hot melt type adhesive is used as the adhesive in the present invention, at least one of the upper mold and the lower mold of the mold must be heated to 100 to 200 ° C. The heating of this mold is also effective because the paperboard whose main raw material is pulp or the like is easily bent by heat and is not easily broken.

When the paperboard is bent by the upper mold and the lower mold, if one mold is fixed, a plurality of bending points can be bent at the same time. Therefore, as shown in FIG. At the same time as it is pulled up, it may be pulled down by the lower folding point, so that it may break at the middle part. Therefore, FIG.
As shown in (a) and (b), by making the step of the lower mold 22 higher than the step of the molded product so as to perform independent movement, the step of the lower mold 21 is different from that of the upper mold 21. It is higher than the step at the corresponding position. Therefore, the upper bending portion hits the upper mold 21 before the lower bending portion and bending is performed. A spring is attached to an independent part of the lower mold 22, and when it is pushed by a force of 20 kg or more, it is lowered to have the same height as the corresponding step of the upper mold 21. As a result, after the bending of the upper bending part is completed, the lower bending will be performed,
Fracture at the middle part is prevented.

[0015]

According to the first aspect of the present invention, the paperboard can be obtained as a three-dimensional cushioning material by a single moving operation of the mold, and at least one of the upper mold and the lower mold is heated. Since the bending is performed in the state, it is difficult for the bent portion to break, and the cushioning material having a complicated shape can be easily manufactured. According to the invention of claim 2, the cushioning material completed from the beginning can be obtained. According to the invention of claim 3, the die is designed so that the pasting portion (paste allowance) of the paperboard is preferentially bent, and at least one of the upper die and the lower die is heated. , It becomes easy to fold and overlap the overlapping areas.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a paperboard cushioning material manufactured by the method of the present invention.

FIG. 2 is a development view of the paperboard cushioning material shown in FIG.

FIG. 3 is a perspective view of the paperboard shown in FIG.

FIG. 4 is a diagram showing a positional relationship when a paperboard is bent by an upper mold and a lower mold.

FIG. 5 is a state diagram with time when the paperboard is bent.

FIG. 6 is a perspective view of a paperboard that is bent over time.

FIG. 7 is an overall view of a paperboard cushioning material manufacturing apparatus according to the present invention.

FIG. 8 is a diagram for explaining how the paperboard is moved in two stages and bent.

9A is a perspective view showing an example of a conventional foamed polystyrene cushioning material, and FIG. 9B is a sectional view taken along line 9B-9B ′ of FIG. 9A.
Sectional view.

10A is a perspective view showing an example of a conventional paperboard cushioning material, and FIG. 10B is a sectional view taken along line 10B-10B ′ of FIG. 10A.

FIG. 11 is a view for explaining that the paperboard is cut depending on how the mold is operated.

[Explanation of symbols]

 1 Paperboard 5 Heat Controller and Press Controller 6 Slide Cylinder 8 Overrise Prevention Switch 11 Adhesive Allowance 12 Raised part 13 Collar part 14, 14 'Sidewall 15 Flat part 16 Vertical part 21 Upper mold (21a pin, 21c heater) 22 Lower mold Mold (22b pin hole) 71 Base plate 72 Slide plate

Claims (3)

[Claims] 1. A method for manufacturing a cushioning material having a three-dimensional structure by bending a paperboard and fixing the necessary parts, and preparing a paperboard in which a cutout or a space portion is provided in an expanded state before assembling and at the necessary part, and At least one of the upper mold and the lower mold is placed in a heated mold, and the upper mold is lowered or the lower mold is raised to bend the glue allowance of the paperboard and use this glue allowance. A method for manufacturing a paperboard cushioning material, characterized in that side walls are overlapped with each other, and at the same time, an uneven portion is formed on the surface. 2. The method for producing a paperboard cushioning material according to claim 1, wherein a hot-melt adhesive is applied in advance to the paste margin of the paperboard, and the necessary portions are attached when the folding of the paperboard is completed. 3. A set of an upper mold and a lower mold, at least one of which can be heated, and the upper mold is lowered by the upper mold or raised by the lower mold. However, when the paperboard is bent with the lower mold, a pin or a protrusion for bending the portion corresponding to the glue margin in advance is provided, and the lower mold has a pin hole for accommodating the pin or the protrusion. An apparatus for manufacturing a paperboard cushioning material, characterized in that it is provided with a recess.