JP3137274B2 - Heat welding fixing method for plastic cardboard boxes. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heat-sealing and fixing a plastic cardboard box used for storing, storing and transferring industrial members such as electric equipment for the purpose of improving environmental pollution and reusing resources. It is.

[0002]

2. Description of the Related Art Most plastic cardboard containers used for storing and transporting industrial equipment members are made of a plastic made of a strong and durable polypropylene resin (PP) material. Is a box body assembled by assembling the punched fixed-size mold material shown in FIG. 1 with the side wall portion rising up on the bottom portion as shown in FIG. 10 and connecting pieces on one side wall inside the other side wall piece. 21 and
In the conventional fixing method, the corner and the central overlapping portion of the container box 21 are fixed with a screw 22 or a frame nail and assembled into a box body. The mouth of the box container has a frame 23 made of vinyl chloride resin (PVC) fitted on the upper edge of the side wall and fixed with screw fittings 24 to form a durable container.

[0003] However, the disposal of used boxes that have been damaged or whose service life has passed has been disposed of as industrial waste.
Means are subject to legal regulations, while means for crushing and recycling used boxes are required, and effective technical means for reuse are also desired between industries and manufacturers. As for the reuse of used box containers, impurities such as metal screws and nail pieces, or synthetic resin material (PVC) different from the synthetic resin material (PP) of the main body in the process of pulverizing and hot-melting pellets
It is necessary to remove the impurities, and the removal and sorting work becomes an extra step, which hinders reuse.
Therefore, the means of assembling and fixing with screws and nails, which has been widely used as a means of solidifying plastic box containers at present, has been improved, and the assembling means with a single resin material such as PP replaces combustion and waste processing with impurities at the time of reuse. There is a demand for an effective assembling and fixing means that saves the work of sorting the pellets and promotes the use of the pellets.

[0004]

Generally, plastic corrugated cardboard is formed from a heat-flexible polypropylene resin (PP), and the molded side of the corrugated cardboard is formed by folding a side wall connecting piece into the other side wall piece. Since the overlapping portion is fixed by bending and assembled and fixed to the box body, means for fixing the fixed portion by heat welding instead of the conventional fixing means for fixing the bent joint portion of the side wall is integrally fixedly connected. Can be considered. The Applicant has achieved various objects by performing various tests in order to solve the technical problem by means of the means for heat-sealing and consolidating the bent and polymerized portion of the mold material, and has achieved the object of the present invention.

[0005]

As means for achieving the above object, a side wall connecting piece of a plastic corrugated cardboard is bent through a heating element at a constant temperature on a superposed surface joined to the inside of the other side wall piece. The present invention relates to a heat-sealing fixing means for a plastic cardboard box for fixing a box body by providing a hot-melt portion in which a mold material is melted, and then pressing the hot-melt overlapped portion of the side wall connecting piece and the other side wall piece. However, it is necessary to solve various technical problems as a means for forming a hot melt portion.

[0006]

A heater at 250 ° C. to 300 ° C. provided with ridges or appropriately shaped projections at one or both of the overlapping corners of the connecting piece of the assembled side wall of the box body and the other side wall piece. Press for 5 seconds to thermally melt the polypropylene resin material in the box at appropriate intervals, and then press the side wall connecting piece provided with the hot melt part and the other side wall overlapping part for 6 to 10 seconds to apply The formed heat-welded portion is integrally fused and assembled and consolidated into a box.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention.
In the drawing, the assembling means for assembling the container box from the mold material m molded of the polypropylene resin (PP) shown in FIG. 1 is as follows: the long side wall piece 11 and the short side wall piece 14 are raised on the bottom 13 as shown in FIG. The connection pieces 12, 12 of the side wall piece 11 are bent inward, and the short side wall pieces 14, 14 are joined to the outside thereof to fix the overlapped portion w to form the box body 10. Reference numeral 15 denotes a joint bar. In the fixing method, as shown in FIG.
Are formed by bending the heat-melted portions 16 and 17 by the heater p in the opposite directions by 30 cm to 40 cm at the corners of the overlapping surface w of the connection piece 12 of the long side wall piece 11 and the short side wall piece 14 bent inward.
In the width of The heat-melting part is provided with ridges 16 'and 17' in opposite directions on the upper and lower surfaces of the plate-like heater p shown in FIGS. C. to 300 ° C., and heat-melts the polymerized surface to form a hot melt portion 16, 1
7 is formed. In the thermal processing, the overlapped surface w of the side wall piece 14 and the connection piece 12 of the box is simultaneously heat-melted with a heater for 1 second to 5 seconds, and then the overlapped surface w having formed the heat-melted portion is further mechanically heated for 6 seconds to 6 seconds. It is pressed for 10 seconds, fixed by heat welding, and formed into a box 10.

As for the method of fusing and fixing the superposed surface w of the box, there is also a processing method in which a heat-fused portion is formed all over the entire surface of a fixed width at the corner of the superposed portion w on either one of the connecting piece 12 and the side wall piece 14 or both sides. However, the melting of only one side has the disadvantage that the fixed part peels off after welding, and when forming the fused part on both sides, excessive heat melting causes deformation of the heat fixed part, deterioration of the box shape such as swelling etc. There are difficulties. Therefore, as described above, as the most suitable processing means, heat melting portions 16, 17 formed by ridges 16 ', 17' provided on both surfaces of the heater plate p are provided on both surfaces of the overlapping portion w of the side wall piece 14 and the connection piece 12. A number of processing tests have proved that the fixing means in which a large number of portions 18 where the fusion portions intersect or coalesce and are welded in a spaced-apart manner as shown in FIG. Was done.

That is, the welding method is such that the ridges 16 ′ and 17 ′ provided on the upper and lower surfaces of the heater plate p shown in FIGS.
The welded portions 18, 19, and 20 where the heat-melted portions of the overlapped surface w obtained by bending and assembling the side wall pieces and the connection pieces of No. 0 cross as shown in FIG. 8 or are orthogonal or united as shown in FIGS. Is formed by a fixing method. Also, ridges 16 ', 1
7 'may be provided so as to be in contact in the same direction. In this step, the movable heater plate p is inserted between the connection piece 12 of the long side wall 11 and the short side wall 14 that support the mildly overlapped heater plate p to provide the heat melting portions 16 and 17 on the overlapped surface w. Then, the heater plate p is retracted from the overlapped surface, pulled out, and the mildly overlapped surface is pressed from above to thereby form a heat-welded portion 1 where the ridges or protrusions overlap.
8, 19, and 20 are fixed. In the present invention, the fixing means is fixed automatically or semi-automatically, and the means for forming the ridges and protrusions is not limited to the above embodiment.

The conventional frame fitted to the mouth of the container box 10 is made of the same polypropylene resin material as the main body instead of the PVC resin, and the fixing means is fixed with resin screws molded of the same material.

[0011]

According to the present invention, in the above-mentioned means for fixing a plastic cardboard box, in order to reuse a used box, in order to save labor in the process of selecting impurities, it is possible to use a metal fitting or to assemble a mold material of another material. It is not necessary, and has the effect of further promoting raw material pelletization by pulverization as an industrial waste treatment means, and is extremely useful as a fixing means for recycling.

[Brief description of the drawings]

FIG. 1 is an exploded view of a mold of a plastic cardboard box.

FIG. 2 is an assembled perspective view of FIG. 1;

FIG. 3 is a perspective view showing an assembling order of a fixing portion of the container box.

FIG. 4 is a plan view of a heater plate p.

FIG. 5 is a rear plan view of the heater plate p.

FIG. 6 is a side view of a heater plate p.

FIG. 7 is a cross-sectional view showing a heat-welded portion formed on the overlapping surface w of the container box fixing portion.

FIG. 8 is a drawing showing the formation of a heat-melted portion on the superposed w surface of the box.

9 (a) and 9 (b) are partial views showing welding by another embodiment of FIG. 8;

FIG. 10 is a perspective view showing a conventional method for fixing a plastic cardboard box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Plastic cardboard box 11 Long side wall piece 12 Connection piece 13 Bottom part 14 Short side wall piece 16 Connection piece heat fusion part 17 Side wall heat fusion part 16 'Back ridge of heater plate 17' Surface ridge of heater plate 18 Heat Welding fixing part 19, 20 Example of heat welding on superposed surface by other heaters m Mold material p Heater plate w Superposed surface

Claims (1)

(57) [Claims] 1. A plastic corrugated cardboard assembling and fixing means for joining a side wall connecting piece to the inside of the other side wall piece and fixing the overlapped portion thereof to assemble into a box body.
Ridges on the upper and lower surfaces of the heater plate heated within the range of
The intersections formed obliquely in the opposite direction to form an X-shape or formed in parallel and perpendicular to each other to form a spaced-apart shape are used as welds, and the overlapping surface of the side wall piece and the connection piece of the box is a heater. And then heat-welding the polymerized surface formed as a hot-melt portion to form a box by heat welding.