JP2002067158A - Heat-welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and firmly perform a molding process without generating separation or the like in a device to press-bond a member which is molded into a cylindrical shape such as an external frame of a lunch box, wherein a synthetic resin film is provided on the surface. SOLUTION: A pair of pressing means and a heating means are provided. In this case, the pair of pressing means are set to be confronted with each other on a working table, and can advance/retract in the horizontal direction. The heating means is set under the working table, and can vertically move from a location under the table onto the advancing/retracting path of the pressing means. The bonding sections at both ends of a band-shape member which is bent into a cylindrical shape are pressed to both sides of the heating means which is projected above the working table by the pressing means, and the bonding sections are heated. After the heating means is lowered, the bonding sections at both ends are pressed by both pressing means and are superposed with each other, and the bonded surfaces are press-bonded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus used for processing a cylindrical member such as an outer frame of a folding box.

[0002]

2. Description of the Related Art Wooden folding boxes are widely used for packaging souvenirs, bento boxes, sushi, and the like. Among them, the folding box used for packaging foods needs to be formed so that wood powder does not come out and adhere to foods as contents, or soup and juice of foods leak outside. Therefore, a coating made of a synthetic resin film is provided inside the folding box.

[0003] The outer frame of a folding box having a synthetic resin film film on the inner side is formed by cutting a wooden board having a synthetic resin film adhered to the surface thereof into a band shape, bending it appropriately along the outer shape of the folding box, and setting both ends appropriately. It is formed by joining and fixing with a width and maintaining the shape of a cylinder. In this case, if an adhesive is used as a means for fixing the joints at both ends of the band-shaped plate material, it is necessary to press-bond the joints until the adhesive is solidified, which requires time and labor for processing. In addition, when the folding box is heated while the food is stored, there are inconveniences such as the adhesive portion being easily peeled off and the smell of the high-temperature adhesive sticking to the nose.

The present invention has been made in view of such a conventional problem,
It is an object of the present invention to enable a member to be formed into a cylindrical shape, such as an outer frame of a folding box, to be efficiently and firmly formed without causing separation or the like.

[0005]

In order to solve the above-mentioned problems, in the present invention, a joint at both ends of a belt-shaped member provided with a synthetic resin film film on its surface is pressure-bonded using a heat welding device. This heat welding device is a device for bonding both ends of a band-shaped member provided with a synthetic resin film film on a surface thereof at an appropriate width and heat-press bonding, and is installed facing a work table and horizontally. A pair of pressing means which can be moved forward and backward, and a heating means which is installed below the work table and which can be moved up and down from the lower part of the table to the path of the pressing means, and which is a tubular member bent into a cylindrical shape on the work table; The two-sided joints are arranged facing each other inside the pressing means, and the two-sided joints are heated by pressing the two-sided joints on both sides of the heating means projected on the work table by the pressing means, and after the heating means is lowered, The two-sided pressing means presses the joints at both ends and operates so that the joints are overlapped and crimped.

The processing of a belt-like member using the apparatus of the present invention is performed in the following procedure. First, the belt-like member is bent into a curved tubular shape or a polygonal tubular shape, and set on a work table. At this time, the joints at both ends of the band-shaped member are arranged facing each other inside the pressing means. Next, the heating means is raised to protrude above the work table, and the pressing means is advanced to push the joints at both ends in the horizontal direction, and the joints at both ends are pressed against both side surfaces of the heating means, respectively. Let me know. When the synthetic resin film film provided at the both end joints is heated to such an extent that it is melted, the heating means is lowered, and both pressing means are advanced to push the both end joints to move between the two pressing means. The heated joints are overlapped and crimped.
Thereafter, if both pressing means are caused to retreat, the fused synthetic resin film films are welded and integrated at the joints at both ends of the band-shaped member, and the band-shaped member is kept in an integral cylindrical shape. In addition, the forward / backward or upward / downward movement of the pressing unit and the heating unit can be provided so as to be performed by operating an operation switch provided in the apparatus. A series of operations of both means may be automatically controlled so that the process from setting the belt-shaped member to completion of the crimping may be automatically performed.

By using the apparatus of the present invention, the band-shaped member can be arranged on the work table, and the pressing means and the heating means can be appropriately operated to efficiently process. That is, when an adhesive is used, the processing is performed at room temperature, and it takes a certain period of time from the application of the adhesive to the solidification of the bonding surface, and the joints are pressed and supported until the applied adhesive is dried. On the other hand, in the apparatus of the present invention, the synthetic resin film films on the joining surfaces are heated and welded and integrated with each other.
It does not take much time for the molten resin to solidify, so that the time for pressure bonding can be reduced as compared with the case where an adhesive is used, and molding can be performed efficiently in a short time.

In the device having the above-mentioned structure, if a concave step portion with which the end of the belt-shaped member is engaged is provided at the tip of the pressing means,
Even if the pressing means is moved forward and backward, the joining portions at both ends of the belt-like member are hardly displaced, which is preferable.

For the belt-shaped member, an appropriate material such as wood, paper, or synthetic resin is used according to the intended use. When forming the outer frame of the folding box, 2 to 7 mm
A wood board thinly cut with a thickness of about the same is used.

The synthetic resin film on the surface of the belt-like member is
It can be provided by attaching a synthetic resin film that can be thermally welded. As a synthetic resin film to be attached, a heat sealable plastic film, for example, polypropylene (CPP) or polyethylene terephthalate (PET), and these are stretched (OP
P) A film is preferably used. Instead of a synthetic resin film, heat-sealable synthetic paper may be used. When the band-shaped member is a wooden board, when attaching a film to this, an EVA resin is suitably used as an adhesive.

In the outer frame of the folding box, it is preferable to provide a synthetic resin film on the entire front and back side surfaces of the outer frame which is the inner and outer peripheral surfaces of the box. When a band-shaped member is formed for applications other than folding boxes, if a synthetic resin film film is provided at least at both ends joined parts that are in contact with each other, the film can be heated and the both ends joined can be thermally welded.

When the outer frame of the folding box is formed by using the heat welding apparatus of the present invention, since the synthetic resin film is attached to the surface of the outer frame formed by the wooden board, the wood powder comes out of the wooden board and the contents are removed. It is hygienic without adhering to food, which is a product, and the outer frame does not absorb moisture, so that the generation of mold and the promotion of corrosion can be suppressed. If a synthetic resin film is stuck to the inner surface of the bottom plate and the inner container, juice and dew of the stored food can be prevented from oozing out of the box from the outer frame, the bottom plate, and the inner container. Even when sticky foods such as rice are stored, sticking to the inner surface of the outer frame or the upper surface of the bottom plate becomes difficult. Further, since the joints at both ends of the outer frame are heat-welded, the joints at both ends are not peeled off or smelled even when the folding box storing the food is heated.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. The illustrated form shows a case where the heat welding apparatus of the present invention is applied to the formation of the outer frame of the folding box.

FIG. 1 shows the outer frame of the folding box. The outer frame 1 is a strip-shaped wooden board 2 obtained by cutting a suitable piece of wood thinly and attaching a transparent synthetic resin film 3 to both front and back surfaces thereof.
Is formed. Specifically, the strip-shaped wooden board 2 is formed by first forming a crease on the surface of a wooden board of an appropriate size, then affixing a synthetic resin film 3 to the surface, and forming a strip along the periphery of the bottom plate of the folding box. And then cut both upper and lower edges 2
A and 2b are formed through a process of applying a varnish and covering a cut surface with a coating. The wooden board 2 developed in a belt shape is bent by the bending line, and as shown in FIG. 2B, the left and right end portions 21 and 22 are overlapped with each other with an appropriate width, and the joining surface is heated. By fusing and integrating the films on the surfaces, a cylindrical outer frame 1 having a rectangular opening is processed.

FIG. 2 shows the configuration of a heat welding device 4 for forming the strip-shaped wooden board 2 into the outer frame 1. This heat welding device 4
Is a pair of pressing means 4 arranged on the work table 41.
2 and 43 and a heating means 44 installed in a housing below the work table 41. In the figure, reference numeral 45 denotes an air unit.

The pressing means 42, 43
The air cylinder 422 is a means for horizontally pressing the ends 21 and 22 of the strip-shaped wooden board 2 supported thereon, and the support plates 421 and 431 contacting the ends 21 and 22 are fixed to the tip of the piston rod. , 432. The two means are arranged facing each other on the left and right sides of the work table 41, and when the piston rod is advanced, the support plate 42 is almost at the center of the work table 41.
When the piston rods retreat, the support plates 421 and 431 move to the left and right sides of the work table 41, respectively.
It is provided so that the center of 1 can be opened widely.

As shown in FIG. 3, the end portions of the strip-shaped wooden board 2 are provided at the distal ends of the support plates 421 and 431.
Concave steps 421a and 431a with which the first and the second engage are formed, and are provided so that the ends do not come off or the joining positions do not shift when the ends 21 and 22 are pressed by the support plates 421 and 431. Also, at the tip of the support plates 421 and 431,
As shown in FIG.
Is provided. The two springs support the ends 21 and 22 set on the support plates 421 and 431 on the support plates, and support the ends when the ends 21 and 22 are pushed by the support plates 421 and 431. When the end portions are heated and the end portions are pressed, the support plates 421 and 431 are provided so as to be separated from the advancing and retreating paths of the pressing means 42 and 43 when the end portions are pressed against each other.

The heating means 44 includes an end 21 of the strip-shaped wooden board 2,
This is a means for heating 22 and is constituted by an air cylinder 442 in which a rectangular ceramic heater 441 having an appropriate width is fixed to the tip of the piston rod. The heating means 44
The air cylinder 442 is installed in the housing below the work table 41 with the piston rod facing upward, and when the piston rod is advanced, the air cylinder 442 is located at the center of the work table 41 and the support plates 421 and 431 of the two pressing means. The ceramic heater 441 protrudes into the moving path, and the ceramic heater moves below the work table 41 when the piston rod is withdrawn.

The procedure for forming the strip-shaped wooden board 2 into the outer frame 1 using the heat welding apparatus 4 will be described with reference to FIGS.
First, the strip-shaped wooden board 2 is bent into a cylindrical shape, and the work table 41 is bent.
Set on top. At this time, both ends are arranged between both pressing means with the end 21 inside the support plate 421 and the end 22 inside the support plate 431.

When the strip-shaped wooden board 2 is set and the foot switch (not shown) of the heating and welding device 4 is pressed, the air cylinder 442 of the heating means 44 is operated, and the ceramic heater 441 is operated.
Rises and projects to the center of the work table 41. When the ceramic heater 441 moves to the rising end, the pressing means 4
The air cylinders 2 and 43 operate and the support plates 421 and 43
1 presses the outer surfaces of the ends 21 and 22 in the horizontal direction, and presses the inner surfaces of both ends against both sides of the ceramic heater 441.

The surface temperature of the ceramic heater 441 is 16
The temperature is set to about 0 ° C., and the ends 21 and 22 are heated by being pressed against both side surfaces of the heater for about 1.5 seconds.

When a predetermined heating time has elapsed, the pressing means 4
2 and 43 temporarily loosen the pushing action by the support plates 421 and 431, and simultaneously the air cylinder 442 of the heating means 44.
Lowers the ceramic heater 441 to move the end 21,
Then, the end portions 21 and 22 heated by the support plates 421 and 431 are pushed again, and the both end portions are overlapped and crimped.

After pressing for a predetermined time, the support plate 421,
431 is retracted to the left and right of the work table 41, the cylindrical outer frame 1 is removed from the work table 41, and the machining process is completed. In addition, the forward / backward movement of the pressing means 42, 43,
The raising and lowering operation of the superheater 44 is controlled in accordance with the operation of the foot switch, and a series of processing steps are automatically performed. According to the device of the present embodiment, both ends 21 of the strip-shaped wooden board 2,
If the plate 22 is set on the support plates 421 and 431 and the workboard 41 supports the wood board 2 on the work table, both ends thereof can be automatically joined and integrated, and the cylindrical outer frame 1 can be processed.

The illustrated form is an example, and the apparatus of the present invention can be provided in another appropriate form. It is optional to use it for processing a band-shaped member other than the outer frame of the folding box.

[Brief description of the drawings]

FIG. 1 is a diagram showing the appearance of an outer frame formed by an apparatus of the present invention before (A) and after (B) molding.

FIG. 2 is a diagram illustrating a structure of an apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram showing a cross section of a structure of a front end portion of a support plate.

FIG. 4 is a view for explaining a processing procedure using the apparatus of FIG. 2;

FIG. 5 is a view for explaining a processing procedure using the apparatus of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer frame 2 Strip-shaped wooden board 21, 22 End part 3 Synthetic resin film 4 Heat welding apparatus 41 Work table 42, 43 Pressing means 44 Heating means

Claims (2)

[Claims] 1. A heat welding apparatus for bonding both ends of a belt-shaped member having a synthetic resin film film provided on its surface with an appropriate width and heating and pressing the same, which is installed on a work table to face each other and has a horizontal direction. A pair of pressing means which can move forward and backward, and a heating means which is installed below the work table and which can move up and down from below the table to a position on the path of the pressing means, and which is bent into a tubular shape on the work table. The joints at both ends are arranged facing each other inside the pressing means,
The two ends of the heating means protruding above the work table are heated by pressing the two end joints on both sides by pressing means, and after the heating means is lowered, the two ends are pressed by the two pressing means so as to overlap each other. A heat welding apparatus characterized in that a bonding surface is pressure-bonded. 2. The heat welding apparatus according to claim 1, wherein a concave step portion with which an end of the band-shaped member is engaged is provided at a tip end of the pressing means.