JPS6049417B2 - Heat fusing equipment for manufacturing synthetic resin folding boxes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-sealing device for manufacturing synthetic resin folding boxes, and is capable of easily heat-sealing the ends of the side materials that become the peripheral side walls and heat-sealing the bottoms of the bottom plate and the side materials. The aim is to obtain a device that can perform the process reliably.

Regarding the conventional manufacturing of folding boxes made of synthetic resin, especially the manufacturing of folding boxes made of thermoplastic resin foam board, the Tokuko Koko 1977-2
As shown in Publication No. 182 and Japanese Patent Publication No. 49-44943, the case is manufactured by the so-called welding method in which important points are thermally fused while assembling the unfolded box material by cutting it with a heating blade. In addition, when a foam board with a wood grain pattern printed on its surface is used, it tends to generate a large amount of thread material that cannot be used, making it expensive and uneconomical. Because the surrounding walls are assembled while being bent, the nearly linear wood grain pattern on the surface of the box material appears in different directions at right angles on the secondary and lateral sides of the surrounding walls in square folded boxes. There were also disadvantages such as discoloration of the fused portion on the inside of the box due to melting and swelling of the resin, which was considered an issue in terms of appearance. In addition, in the case of a method in which a series of frame materials are cut from a foam board of a predetermined size, a groove into which the bottom plate is inserted is cut slightly upward from the bottom edge, and the bottom plate is inserted into the groove. The edges of the frame were glued, nailed, or heat-sealed, but in the case of gluing or nailing, adhesives were used for folding boxes used as food containers/vessels. Rust caused by metal nails is not desirable from a food hygiene perspective, and the current situation is that we have no choice but to rely on heat fusion.Moreover, the conventional technology described above, which relies only on fitting the bottom plate, prevents the intrusion of dust and lacks watertightness. Other points were also considered problematic. Therefore, in order to eliminate the drawbacks of the above-mentioned conventional folding box manufacturing methods, and to provide a product that is much easier to assemble and has a stronger connection between the peripheral side walls and the bottom plate, the present inventor has developed a method for manufacturing folding boxes that uses the peripheral side walls. A groove for bending is formed on the side material made of thermoplastic resin, and a bottom groove is formed with the lower end open to the outside.
The above-mentioned bending groove is used to bend it into a frame shape, and the abutted ends are fused together to form a circumferential side wall, and a thermoplastic resin bottom plate formed separately from the circumferential side wall is attached to the above-mentioned bottom plate. We have invented a method in which the circumferential side wall is fitted into the bottom groove during or after bending, and then the circumferential wall and the bottom plate are fused together around the bottom. There are things that have yet to be invented.

The configuration of the device according to the present invention is that a mold part is provided on the table to which the side material made of thermoplastic resin that becomes the peripheral side wall can be made into a rectangular shape and can be placed along the side material, and the mold part is heated and fused to the corner portion where both ends of the side material abut against each other. A heating blade is fixed on the table, and the mold part is made to be able to move freely on the table together with the side material to the heating blade part, and a mold made of thermoplastic resin is fitted into the bottom groove facing the upper side of the peripheral side wall. The device is characterized in that a rectangular frame-shaped heating welding tool for heating and welding the bottom plate to the circumferential side wall around the bottom is installed at a position above the table so as to be movable up and down.

Next, embodiments of the present invention will be illustrated below with reference to the drawings.

In FIGS. 1 to 4 and 5 to 14, 1 is a table, 2 is a mold part provided on the table 1, and the mold part 2 is made of thermoplastic resin that becomes the peripheral side wall 50 of the folding box. The outer shape is usually rectangular so that the side material A made of aluminum can be squared and placed along the side material A.

3 is a groove in the table 1, and 4 is a mold part 2 through the groove 3.
5, 5 is a fixed part below the table, 6, 6 is a plurality of drum-shaped rolling members provided on the moving table part 4, and 7 is a part where the rolling members 6, 6 are connected. It is fixed to the fixed parts 5, 5 by a guide rail with a diamond-shaped cross section that can be fitted and rolled. Ru.

Reference numeral 8 indicates a spring that pulls the movable table section 4 away from the heating blade described later, and reference numeral 9 indicates a stopper section.

The mold part 2 can move together with the movable table part 4 in the direction opposite to the traction force of the spring 8 (toward the heating blade, which will be described later), and when the force for movement is released, the spring 8
It is designed to be pulled back by the traction force of. then 10
is a heating blade fixed at the mold part advancing position on the table 2, and is designed to be able to heat and fuse the corner portions where both ends of the side materials abut against each other.

Reference numeral 11 denotes a holding portion for the heating blade 10, which allows the position of the heating blade 10 to be finely adjusted.

Further, reference numeral 20 denotes a rectangular frame-shaped heating welding tool that is installed above the table 1 so as to be able to rise and fall freely.
A bottom plate 60 made of thermoplastic resin, which is fitted into the bottom groove 52 facing upward, is heat-fused to the peripheral side wall 50 around the bottom.

Reference numeral 21 denotes a holding part for the heat fusing tool 20, 22 a lifting mechanism part such as a cylinder mechanism for moving the heat fusing tool 20 up and down, and 23, a spring 24 is interposed to press the bottom plate 60 stably so that it does not swing. The figure shows the presser tool used to hold the

The above-mentioned heat-sealing tool 20 may be one that heats and fuses the bottom part of the folding box in a stepped shape, but in the case shown in the figure, a device that can be formed obliquely is used (see especially FIG. 14).
. Further, the heating and fusing tool 20 is lowered by a foot pedal (not shown) or the like.

The mold section 2 on the table 11 mentioned above is designed so that it can be replaced each time with one of an appropriate size depending on the size of the folded box (see the mold section 2'' indicated by the chain line in Figure 4).
, Furthermore, in order to separate the folded box after manufacturing from the mold part, the mold part 2
In some cases, a knockout member (shown in the figure) that pushes up from below the table is installed along the whole or part of the table.

The apparatus according to the present invention is constructed as described above, and is manufactured through the operations shown in FIGS. ~To illustrate based on FIG. 18, A
is a side material material for forming a frame-shaped peripheral side wall 50 that becomes a side material, and is made of a thermoplastic synthetic resin plate, such as a foamed polystyrene resin plate (including sheet-like cases). The peripheral side wall 50 can be formed using this material, and a V-shaped groove 51 for bending and a bottom groove 52 that can be opened to the outside are formed on the bottom side. , and are used by sequentially cutting them into individual circumferential side walls 50.

53, 53'' indicate both ends of the side member A.

B, b'' is a wood grain pattern.The material which becomes the peripheral wall 50 obtained in this way, and the bottom plate 60 which is formed from a separate foamed polystyrene resin plate (including the case of a sheet). The process of manufacturing a folding box using the above-mentioned material using the apparatus of the present invention will be explained in sequence with reference to the drawings. Both ends of the side material 53 with material A along
, 53" open so that it faces the heating blade 10 side (
(See Figures 5-6).

Next, the mold part 2 with the side material is brought close to the heating blade 10 side together with the movable table part 4 connected through the groove part 3 of the table 1,
The heating blade 10 is inserted between both ends of the side material to heat it (see Fig. 7), and the mold section 2 with the side material is retreated to separate both ends of the side material 53, 53''.
The corner portions where they meet are fused together to form the circumferential side wall 50 of the folded box (see FIG. 8). Next, the bottom plate 60 is fitted into the bottom groove 52 facing upward of the circumferential wall 50 (see FIG. 9).
After fitting, the rectangular frame-shaped heat welding tool 20 located above the table is lowered (see FIG. 10), and the bottom plate 60 and the peripheral side wall 50 are heat welded around the bottom (see FIG. 10). (See Figure 11), a folding box will be manufactured. After the heat fusion described above, the heat fusion tool 20 may be raised and returned to its original state by operating a timer as appropriate. In particular, the heat fusion around the bottom of the bottom plate 60 and the peripheral side wall 50 is shown in FIGS. 12 to 14.
The layers are clearly illustrated.

As described above, according to the device of the present invention, the side material that becomes the circumferential wall is made into a rectangular shape and is placed along the mold portion on the device table, and the mold portion is transferred along with the side material to the heating blade portion on the table. By heating the corner portions of both ends of the side material with a heating blade fixed on a table, and then butting and fusing the corner portions, a rectangular peripheral side wall can be easily created. Therefore, the corner portions can be heated and fused without any trouble.

Further, it becomes easy to heat-seal the circumferential side wall and the bottom plate fitted in the bottom groove of the circumferential side wall around the bottom using a square frame-shaped heat-sealing tool. Therefore, by using the device of the second invention, it becomes easier to control the timing of the welding operation, and even non-experts can quickly and efficiently carry out accurate heat-welding operations. In particular, since the side material for forming the peripheral side wall is worked along the mold part, it can be manufactured into an accurate square shape. In the folding box manufactured using the device of the present invention, the circumferential side wall 50 is bent into a frame shape from the bending groove 51, and the abutting ends 53, 53'' are heat-sealed to each other.
Therefore, even if there is a wood grain pattern b on the outer surface, the entire circumferential wall 50 can be aligned in the same direction with respect to the pattern, and the folded box obtained by the conventional welding method can be This eliminates the unsightly appearance of the pattern directions being different in the vertical and horizontal directions of the circumferential wall.

In addition, a bottom groove 52 is formed in the bottom of the circumferential wall 50 with its lower end open to the outside, into which the bottom plate 60 is fitted and is joined by heat-sealing D to each other around the bottom. It is possible to provide a folding box that can be manufactured without using any agents or nails and is suitable from the point of view of food hygiene. Moreover, since they are joined by heat fusion, the circumferential side wall and the bottom plate can be firmly and reliably joined together, and are watertight, thereby preventing moisture from leaking from the bottom of the stored items.

[Brief explanation of drawings]

The figures illustrate an embodiment of the present invention, and FIG. 1 is a schematic side view of the device, FIG. 2 is a side view of the mold section and heating blade section, and FIG. 3 is a partially cutaway front view of the mold section. , Figure 4 is a plan view,
Figures 5 to 11 are perspective views showing each stage of manufacturing;
Figures 2 to 14 are cross-sectional views showing the bottom plate and the circumferential side wall being heated and fused together; Figure 15 is a plan view of the material forming the circumferential side wall;
Figure 6 and Figure 17 are the same side and front views as above, and Figure 2.
Fig. 18 is a perspective view from the bottom side before the bottom plate is inserted into the peripheral side wall, and Fig. 19 is a perspective view of the manufactured folding box. 1...Device table, 2...Mold section, 3
・・・Groove, 4...Moving table part, 5...
...Fixed part, 6...Trumpet-shaped rolling member, 7...
...Rhombus rail, 10...Heating blade, 20...
・Heat fusing tool, 23... Holder, A...
...Side material, 50...Peripheral side wall, 51...
...Bending groove, 52...Bottom groove, 53,53゛...Both ends of side material, 60...Bottom plate.

Claims (1)

[Scope of Claims] 1. A mold part on a table that allows a side material made of thermoplastic resin that will become a circumferential side wall to be made into a rectangular shape and fit along, and heating to heat and fuse the corner portion where both ends of the side material abut against each other. The blade is fixed on a table, the mold part is made to be able to move freely on the table to the heating blade part together with the side material, and a bottom plate made of thermoplastic resin is fitted into a bottom groove facing the upper side of the peripheral side wall. Heat fusing for manufacturing synthetic resin folding boxes, characterized in that a rectangular frame-shaped heat fusing tool is installed at a position above the table so as to be movable up and down, for heat fusing the circumferential side wall and the bottom periphery. Device. 2. The mold part is connected to a movable base part below the table through a groove in the table, and the movable base part is provided with a plurality of hour-shaped rolling members that can fit into a rhombic cross-section rail and roll. 2. A heat fusing device for producing a synthetic resin folding box according to item 1. 3. The synthetic resin folding box according to claim 1, wherein the rectangular heat-sealing tool for heat-sealing the bottom plate and the circumferential side wall to each other is capable of forming the bottom fused portion of the folding box in an oblique shape. Heat fusing equipment for manufacturing.