JPH0566258B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a method for manufacturing a composite box, and more specifically to a box material in which a thin body made of a sheet or film is laminated on a veneer made of a thermoplastic resin sheet. Relating to a method for obtaining a composite box in which a thin body is laminated on the surface by pressing into a cylindrical shape, bending the circumferential side of the box material, and then joining the abutting ends of the circumferential side to each other. .

<Prior art> Conventionally, boxes made of thermoplastic resin sheets for storing foods, etc. have been coated with thin materials such as sheets or films on the outer surface in order to enhance the display effect, increase strength, and reduce thickness and weight. A laminated version is available.

The method for manufacturing a composite box in which the thin bodies are laminated is as follows: A long multilayer sheet in which a thermoplastic resin sheet and a thin body are laminated is run intermittently, and predetermined parts are punched out. A method of forming a box material in the expanded shape of a box, pushing the box material into a cylindrical shape and bending it into a box shape, and then joining the abutting ends of the circumferential sides.

The thin body and the thermoplastic resin sheet are separately punched to obtain a punched piece in the expanded shape of a box, and both punched pieces are joined to form a box material, and the box material is placed inside a cylindrical mold. A method in which the butt ends of the peripheral sides are joined together after being bent into a box shape.

It has been known.

<Problems to be Solved by the Invention> According to the above manufacturing method, since the thin body is laminated to the thermoplastic resin sheet, it is not possible to reuse the surplus sheet after punching out the box material. There is a problem in that it is difficult and the material cost is correspondingly high.

In addition, according to the manufacturing method of , it is possible to reuse the surplus portion of the thermoplastic resin sheet, but when joining the punched pieces of the thermoplastic resin sheet and the thin body, misalignment of the two may occur. There is a problem that quality defects occur frequently. Furthermore, since it is necessary to clamp and feed the punched pieces, there is also the problem that the feeding mechanism becomes complicated.

<Purpose> This invention was made in view of the above-mentioned problems, and provides a composite box in which surplus portions of thermoplastic resin sheets can be reused, and high-quality boxes can be easily and inexpensively manufactured. The purpose is to provide a manufacturing method for.

<Means for Solving the Problems> In order to achieve the above object, the method for manufacturing a composite box of the present invention includes a method for manufacturing a composite box of the present invention, in which a long thin sheet is pre-cut into the unfolded shape of the box, leaving a partial uncut portion. The thin body is moved intermittently, a veneer of a predetermined size made of a thermoplastic resin sheet is superimposed on the thin body, and the inside of the cut part of the thin body and the corresponding part of the thermoplastic resin sheet are joined. A laminating process in which bending grooves are formed in the veneer using a cross-shaped heated blade, and at the same time the ears at the four corners of the veneer are removed.The thin body and the veneer are pressed with a press die. A bending step is performed in which the inside of the cut portion of the thin body is separated from the surplus portion to obtain a box material, and the box material is pushed into a cylindrical mold as it is and the peripheral side portion of the box material is bent. It is characterized by

<Examples> Examples will be described in detail below with reference to the accompanying drawings showing examples.

FIG. 1 is a schematic diagram showing a method for manufacturing a composite box according to the present invention, and exemplifies the case where a folded box-shaped composite box is manufactured.

The manufacturing method of the above-mentioned composite box includes a long thin body made of paper, a synthetic resin sheet, a synthetic resin film, etc.
At position 10, a preliminary cut is performed to cut a predetermined portion of the thin body 1 while unwinding from the winding m and intermittently running and supplying the thin body 1. At position 20, the thin body 1 and the thermoplastic resin sheet are cut. At position 30, the veneer 2 and the thin body 1 are formed into a cylindrical shape. A folding process is performed in which the paper is pushed inside and bent into a box shape.

To explain in more detail, the thin body 1 has a hot melt type adhesive applied to the surface to be joined to the veneer 2 (lower surface in the case of the figure), and is held by a pair of pinch rollers R, R. The vehicle is run intermittently at predetermined intervals. Further, as the veneer 2, a rectangular one cut to a size that fits the box dimensions is used, and as the thermoplastic resin sheet constituting the veneer 2, for example, a foamed polystyrene sheet is used. be able to.

Then, in position 10, thin body 1
is pre-cut into the unfolded shape of a box having a side piece 1a and a bottom piece 1b, leaving a partial uncut part 1c (see FIG. 2). The preliminary cutting can be performed, for example, by the Thomson blade 13 that can be moved forward and backward by the cylinder 11 via the link mechanism 12. Note that reference numeral 14 in the drawings indicates a pedestal provided opposite the Thomson blade 13.

Next, at position 20, the veneer 2 is fed onto a press plate 22 provided below the thin body 1.
The supply of the veneer 2 can be performed, for example, from a direction intersecting the running direction of the thin body 1. At this time, the veneer 2 is aligned with the cut portion of the thin body 1 using a positioning means such as a stopper 21.
Fixed in place. Then, the press plate 22 is raised by a drive mechanism such as the cylinder 23, and
The thin body 1 and the veneer 2 are stacked on top of each other, and they are sandwiched between the hot plate 24 placed on the top of the thin body 1, and the adhesive applied to the thin body 1 by the hot plate 24 is removed. The thin body 1 and the veneer 2 are joined by heating the agent. This joining of the thin body 1 and the veneer 2 is performed inside the cut portion A of the thin body 1, that is, in the portion of the veneer 2 excluding the ears 2a at the four corners. For this reason, the planar shape of at least the heating surface 24a of the hot plate 24 is formed into a contour shape that matches the pre-cut shape of the thin body 1. Note that the hot plate 24 is
It is normally heated to a temperature in the range of 80 to 140°C by an internal heater 24a.

Then, in position 30, a known cross-shaped hot blade 31 facing the veneer 2 is pressed against the veneer 2 to cut off the ears 2a at the four corners of the veneer and at the same time form the bending grooves 2b. After the above forming process is completed, with the hot blade 31 separated from the veneer 2, the pressing die 3 is moved by a drive mechanism such as a cylinder 32.
3, press the thin body 1 and the predetermined parts of the veneer 2 with the press die 33, cut the non-cut part 1c of the thin body 1, and turn the inside A of the cut part into an excess part B. The box material 3 is obtained by separating the box material from the cylindrical mold 34, and the box material is then pushed into the cylindrical mold 34 to remove the peripheral side portion 3a.
to bend.

Furthermore, the box material 3 bent in the above manner is sequentially collected from the cylindrical mold 34, and the abutted ends of the peripheral side portions 3a are joined by heat fusion or the like, so that the thin body 1 is laminated on the surface. It is possible to manufacture composite boxes that are Regarding the surplus part B of the thin body 1,
At the feeding end side, it is sequentially wound up and collected. Furthermore, the ears 2a of the veneer 2 are discharged downward or sideways and collected during the molding process.

In addition to the above-mentioned foamed polystyrene sheet, the foamed sheet used as the material for the veneer 2 may also include copolymers of polystyrene and other resins, high-impact polystyrene, polypropylene, polyethylene, vinyl chloride, MMA, etc., similar to those used in conventional packaging boxes. Foamed sheets of various thermoplastic resins can be used. other than this,
Of course, non-foamed sheets of thermoplastic resin can also be used.

In addition to supplying the veneer 2 to the position 20 in the form of a veneer in advance, the veneer 2 may also be supplied as a long thermoplastic resin sheet to the feed line to the position 20. In the middle of the line
In some cases, it is formed into a single plate shape.

Further, as for the outer shape of the box, other than the illustrated rectangular deep dish shape, other polygonal shapes such as a hexagonal shape may be used.

On the other hand, it is preferable to apply an adhesive to one side of the thin body 1 in order to improve its integrity with the veneer 2. As the adhesive mentioned above, a thermal adhesive that exhibits an adhesive effect when heated is suitable, but in addition to this, a pressure-sensitive adhesive that exhibits an adhesive effect by applying pressure or other adhesives may also be used. can be used. In particular, when a synthetic resin sheet or film is used as the thin body 1, it is also possible to join them by heat fusion without applying an adhesive.

As for the preliminary cutting of the thin body 1, in addition to the case where it is carried out during feeding to the lamination process as described above, it may also be carried out on a separate line that is discontinuous with the lamination process. Position 2 where the pre-cut thin body is laminated
It will be supplied directly to 0.

In addition, various changes can be made without changing the gist of the invention, such as performing the molding step and the bending step in different positions.

<Effects of the Invention> As described above, according to the method for manufacturing a composite box of the present invention, the thin body is handled in the form of a long sheet until just before the folding process, which makes the process easier than handling the thin body individually as punched pieces. As a result, it is easy to handle the supply and the like, and it is also easy to align the thin body and the veneer in the lamination process, so that they can be joined in a state where they are reliably aligned. Furthermore, since the selvedges, which are surplus parts of the veneer, are separated from the thin body, the selvages can be collected and reused, which has the advantage of reducing material costs.

Therefore, a unique effect is achieved in that a composite box of good quality can be manufactured easily and at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the method for manufacturing a composite box of the present invention, and FIG. 2 is a plan view of the main part. 1... Thin body, 1c... Non-cut portion, 2... Single plate, 2
a...Single plate edge part, 3...Box material, 3a...Surrounding side part, 31
...heat blade, 33...push type, 34...cylindrical type.

Claims (1)

[Claims] 1. A box material in which a thin body made of sheets or films is laminated on a single plate made of a thermoplastic resin sheet is pressed into a cylindrical shape, and the peripheral side of the box material is bent. After that, in the method of obtaining a composite box in which a thin body is laminated on the surface by joining the abutting ends of the peripheral side parts, the box is pre-cut into the expanded shape of the box, leaving a partial uncut part. A long thin body,
A method for manufacturing a composite box, characterized by carrying out the following steps through intermittent running. A lamination process in which a thin body is laminated with a veneer of a predetermined size made of a thermoplastic resin sheet, and the inside of the cut part of the thin body and the corresponding part of the thermoplastic resin sheet are bonded. A forming process in which a cross-shaped heated blade is used to form bending grooves in the veneer and at the same time remove the ears at the four corners of the veneer. The thin body and thermoplastic resin sheet are pressed with a press die, the inside of the cut part of the thin body is separated from the excess part to obtain a box material, and the box material is pushed into a cylinder as it is to form a box. A bending process in which the circumferential side of the material is bent. 2. The thin body used is one whose bonding surface to the thermoplastic resin sheet is coated with an adhesive in advance, and in the lamination process, the thin body is heated and bonded to the veneer. A method for manufacturing a composite box according to item 1. 3. The method for manufacturing a composite box according to claim 1, wherein the forming step and the bending step are performed at the same position.