JPH0785912B2 - Method for forming thermoplastic resin container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a foamed or non-foamed thermoplastic resin sheet to erect a side plate around a bottom plate of a container (product) to be formed and to weld the edge of the erect side plate. The present invention relates to a container forming method for forming a container.

[0002]

2. Description of the Related Art A container forming means of this kind is a container forming material (resin sheet) in a receiving mold which matches the shape of a container to be formed, in the form of a developing plate of the container, and in a state where the welded portion is melted. A machine of the type in which the side plate is erected by a die and simultaneously welded to form a container, and the formed container is taken out from the die (Japanese Patent Publication No. 57-30652).
Japanese Unexamined Patent Publication No. 59-152818, etc.), and a container forming material is pushed into a forming hole portion having an inclined wall surface or an upright wall surface without receiving a mold to form a container, and the pressing of the forming hole portion is opposite to the side. Machine for pushing out containers more
Nos. 4168 and 57-43131 are known.

When the structure for melting the welded portion is classified into types, when the expansion plate is pushed into the die or the forming hole, it contacts the edges d1 and d2 of each side plate shown in the expansion plate of FIG. Heat plates are arranged on all sides and melted at predetermined points by contact with the heat plates (Jitsuko Sho 63-3)
No. 1945, etc.) and folding curves c1 and c2 of each side plate and side plate edges d1 and d2, which are extensions of the side curves, are attached to the appropriate upper and lower actuating bodies, and the expansion plate (or raw) which melts a predetermined location by abutting the (JP 60-120035, Japanese Utility Model 56-2621
No. 8) is known.

[0004]

If the size of the container to be formed is different, whether the receiving type or the forming hole type, the size of the receiving or forming hole must be changed. However, the position of the hot plate or hot blade must be changed accordingly. Moreover, in the case of a four- sided hot plate, it is necessary to adjust the positions of four hot plates at the same time,
The adjusting mechanism becomes complicated. Also, in the case of double girder contact hot blades, two sets of parallel hot blades or T-shaped hot blades are combined.
Since it is formed in combination, a position adjusting mechanism or means for changing the mounting position of the hot blade with respect to the vertical moving body is required, and the adjusting mechanism is complicated, and the position changing means is disclosed in Japanese Utility Model Publication No. 55-10094. As shown, it involves complicated work.

Further, the welding of the thermoplastic resin sheet can be performed by melting only one of the welded portions without melting both of the welded portions, and the conventional melting mechanism is to melt both of the welded portions. It becomes wasteful in terms of energy.
Therefore, the present invention proposes a container forming method that can be easily handled by a machine even if the size is changed.

[0006]

Forming a thermoplastic resin container according to the present invention In order to achieve the above object, according to the parallel edges of at least the side plates of the metal sheet which arranged side plates four sides of the bottom plate, and arranged parallel 2
Characterized in that thermally melted only in number of heating bodies, brought upright side plates simultaneously, to form a container by performing welding of the melted portion
It is what Further, in the expansion plate , a bent line portion and a side plate edge that is an extension thereof are formed in a V-shaped groove in a cross beam shape.
Then, in the method of forming the container in which each side plate is then raised.
The pair of parallel V-grooves are preformed at an angle of about 90 °, and the other pair of parallel V-grooves are formed by heat melting or are formed beforehand at an acute angle with respect to the 90 ° groove. Description welding of melted portions I line brought upright side plates at the same time as the hot melt of the V groove
It is characterized by forming a container . Further, a hot melt adhesive may be applied to the welded portion in advance and then the adhesive may be used for welding.

[0007]

Since the heat melting portion of the spreading plate is positioned in parallel, at least the edge of the side plate of the spreading plate is melted by the two heating elements arranged in parallel and the side plate is erected. The edge and the adjacent non-melted side plate edge are welded together to form a box-shaped container. Further, in the case of a development plate having grooves formed in a cross beam shape, only the non-melting portion (90 ° groove) of the folding curve stands up and the melting folding curve portions are welded to each other, but the edges of the side plates are adjacent to each other. Since one of them is always melted, they are welded to each other to form a box-shaped container.

[0008]

EXAMPLES Next, examples of the present invention will be described. As shown in FIGS. 1 and 2, the expansion plate A used in the present invention is one in which side plates b1 and b2 are continuously provided on the four circumferences of a bottom plate a. Folding curves c1 and c2 between the bottom plate a and the side plates b1 and b2. Edge d1,
d2 is a groove with a V groove angle Θ1 of about 90 °, and a bending curve c1
The angle .THETA.2 of the groove connecting with the edge d2 is an acute angle smaller than 90.degree .. To form the container B from the expansion plate A, the surfaces of the acute-angled grooves (c1, d2) are heat-melted, and at the same time, the side plates b1, b2 are erected. It is what is converted.

The specific means of the forming device for forming the container B from the above-mentioned expansion plate A is composed of a melting portion 1, a pressing portion 2 and a forming hole portion 3 as shown in FIG. Melting part 1
Is two hot blades (heating body) 11 arranged in parallel, and the hot blade 11
Of the holding body 12 and the vertical movement mechanism 13 of the holding body 12, the pushing portion 2 is a pressing device for pushing the developing plate A into the forming hole portion 3, and the forming hole portion 3 is formed from a plane projection of the developing plate A. It has an inclined inner wall surface corresponding to the plane projection of the container B to be spiraled. Thus, the development plate A is formed above the formation hole portion 3.
Is supplied (FIG. 3), the melting portion 1 is brought into contact with the expansion plate A to heat-melt the surface of the predetermined acute-angled grooves (c1, d2) (FIG. 4), and immediately after the melting, the expansion plate A is pressed by the pressing portion 2. Press into the forming hole 3
The side plates b1 and b2 are erected to form a box-shaped container B (FIG. 5).

When melting the above-mentioned acute-angled grooves (c1, d2), it is natural to set the angle Θ2 of the acute-angled grooves in advance in consideration of the shrinkage of the material during the melting. If the two hot blades 11 are adjustable as shown in FIG. 6, even if the size of the expansion plate is changed, it can be immediately dealt with.

The embodiment of the present invention has been described above.
For example, as shown in FIG. 8, instead of forming the acute-angled groove in the development plate in advance, the acute-angled groove corresponding portions c10 and d10 may be melted, and at the same time, the side plates may be vertically welded to form the container. It is also possible to use a spreading plate having hot-melt adhesive applied in advance to the acute-angled grooves and heat and melt the adhesive ultrasonically to form the container. Further, as long as the welding points can be heated and melted by two heating members arranged in parallel positions, only the edge d2 of the side plate b2 may be heat melted without performing the heating in the bending curve in particular. Further, the concrete structure of the forming device may be, for example, a receiving type one, not a forming hole type one, or may be a device provided with a developing plate supply part or a product discharge part. The operation of the melting portion and the pressing portion may be manually performed, and any operation is possible.

[0012]

EFFECTS OF THE INVENTION The present invention is a method for forming a container by heat-melting only parallel groove portions in a given expansion plate and raising the four side plates so that two heat blades are always arranged in parallel positions. Due to melting, the position of the hot blade can be adjusted easily even if the size of the spreading plate is changed, and there is also the advantage of saving energy by reducing the number of melting points.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process of the present invention.

FIG. 2 is a plan view of a development plate.

FIG. 3 is an explanatory view of the operation of the forming machine (at the time of supplying a developing plate).

FIG. 4 is an explanatory view of the operation of the forming machine (at the time of contact with a hot blade).

FIG. 5 is an explanatory view of the operation of the forming machine (at the time of pushing in the developing plate).

FIG. 6 is a diagram showing an example of a moving mechanism of a hot blade.

FIG. 7 is a diagram showing another embodiment of a hot blade (heating body).

FIG. 8 is a plan view showing another example of the expansion plate.

[Explanation of symbols]

 A Development plate B Container a Bottom plate b1, b2 Side plates c1, c2 Bending plates d1, d2 Edge 1 Melting part 11 Hot blade (heating body) 12 Holding body 13 Vertical moving mechanism 2 Push-in part 3 Forming hole part

Claims (4)

[Claims] The method according to claim 1] small <br/> without even parallel edges of the side plates of the metal sheet which arranged side plates four sides of the bottom plate, and hot melt only two heating bodies arranged parallel, the side plates simultaneously A method for forming a container made of a thermoplastic resin, characterized in that the container is formed by standing up and welding the melted portion. 2. A deployment plate in which side plates are arranged on the four circumferences of the bottom plate ,
Of the container in which the part that becomes the folding curve and the side plate edge that is its extension are formed in a V-shaped groove in a cross beam, and then each side plate is raised up
In the forming method, the pair of parallel V-grooves are formed in advance at an angle of about 90 °, and the other pair of parallel V-grooves are arranged in parallel.
A method for forming a container made of a thermoplastic resin, characterized in that the container is formed by heat-melting with two placed heating bodies, and at the same time raising each side plate to weld the melted portion. 3. The V formed by thermal melting according to claim 2.
A container made of a thermoplastic resin, characterized in that the groove is formed in an acute angle from the 90 ° groove in advance, the groove surface of the acute angle groove is heat-melted, and at the same time, each side plate is raised to weld the melted portion to form a container. Forming method. 4. In any one of claims 1 to 3, the heat-melted portion of the metal sheet, previously hot-melt adhesive forming a thermoplastic resin container formed by coating.