JPH04250023A - Formation of thermoplastic resin vessel - Google Patents

Abstract

PURPOSE:To perform easily and efficiently formation of a vessel by dealing with a change of size of a development sheet, by a method wherein simultaneously with heat melting of the parallel fringes of a side sheet, the side sheets each are stood up and melted parts are fused together, in the developed sheet where the side sheets are arranged on the circumferential part of the bottom sheet. CONSTITUTION:Side sheets b1, b2 each are provided by connecting with the circumference of a bottom sheet (a), in a development sheet A. In this case, in fringes d1, d2 each of bend lines c1, c2 each between a bottom sheet (a) and the side sheets b1, b2 each, a V groove is set up into a groove so that an angle theta1 of the same becomes about 90 degrees. Then an angle theta2 of the continuing groove is set up at a smaller acute angle than the 90 degrees by the bend line c1 and fringe d2. Then to form a vessel B of the development sheet, simultaneously with heat melting of the surfaces of acute angle grooves c1, c2, the side sheets b1, b2 each are stood up. Then a melted parts are stucks to each other, solidified and integrated into a box type.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention uses a foamed or non-foamed thermoplastic resin sheet to erect a side plate around the bottom plate of a container (product) to be formed, and welds the edges of the erected side plate. The present invention relates to a container forming method for forming a container.

0002

[Prior Art] This type of container forming means involves applying a container forming material (resin sheet) to a receiving mold that matches the shape of the container to be formed, in the form of a container expansion plate, and with the welded portion melted. A type of machine in which the side plates are pushed in, the side plates are erected by the receiving mold, and at the same time they are welded to form a container, and the formed container is taken out from the receiving mold (Japanese Patent Publication No. 57-30652,
JP-A-59-152818 et al.), a container is formed by pushing a container forming material into a forming hole having an inclined wall surface or an upright wall surface without using it as a mold, and the pressing of the forming hole is on the opposite side. A type of machine that extrudes containers (Utoko 52-2)
No. 4168, Utility Model Application Publication No. 57-43131) are known.

[0003] Furthermore, the structure for melting the welded portion can be divided into types: hot plates are placed on all sides that come into contact with the edge of each side plate when the developing plate is pushed into the receiving mold or forming hole; Items that melt at certain points due to
Japanese Utility Model Publication No. 63-31945, etc.) and a method in which a heating blade for melting is brought into contact with a developing plate (or original fabric) to melt predetermined areas (Japanese Patent Publication No. 57-30652) are known.

0004

[Problem to be solved by the invention] If the size of the container to be formed is different, whether it is a receiving mold type or a forming hole type, the size of the receiving mold or forming hole must also be changed. Therefore, the position of the hot plate or hot blade must be changed accordingly. However, in the case of a four-sided hot plate, the position of each of the four hot plates must be adjusted at the same time.
The adjustment mechanism becomes complicated. Further, in the case of a contact heating blade, it is necessary to change the attachment position of the heating blade with respect to the vertically moving body, and the adjustment involves complicated work as shown in Japanese Utility Model Publication No. 10094/1983.

Furthermore, thermoplastic resin sheets can be welded by melting only one of the welded parts without melting both of the welded parts, and all conventional melting mechanisms are designed to melt both of the welded parts. This results in a waste of energy. Therefore, the present invention proposes a method for forming a container that can be easily handled by a machine even if the size is changed.

[0006]

[Means for Solving the Problems] The method for forming a thermoplastic resin container according to the present invention is to heat a developing plate with side plates arranged around the four peripheries of the bottom plate using two heating elements arranged in parallel. It is characterized by the fact that the side plates are erected at the same time as the container is melted, and the molten parts are welded to form a container. When forming the part that becomes the fold line and the end edge of the side plate that is the extension thereof into a cross-shaped V groove, a pair of parallel V grooves should be formed at an angle of approximately 90°.
The other parallel pair of V-grooves are formed in advance at an angle of This is for welding parts. Alternatively, a hot melt adhesive may be applied to the welded portion before welding with the adhesive.

[0007]

[Operation] When only the edge of the acute-angle groove corresponding part or the edge and the folded line are melted and the side plate is erected, the unmelted part of the folded line (
Although the 90° grooves only stand upright, the fused parts adhere to each other, and the adjacent edges of the side plates are always fused, so they weld to each other, forming a box-shaped container.

[0008]

[Example] Next, an example of the present invention will be described. The expansion plate A used in the present invention has side plates b1 and b2 connected to the four circumferences of a bottom plate a, as shown in FIGS. 1 and 2, and the folding lines c1 and c2 between the bottom plate a and the side plates b1 and b2 edge d1,
For d2, the angle Θ1 of the V groove is approximately 90°, and the bending line c1
The angle Θ2 of the groove connected to the end edge d2 is an acute angle smaller than 90°. In order to form the container B from the expansion plate A, the surfaces of the acute angle grooves (c1, d2) are thermally melted and the side plates b1, b2 are raised at the same time, and the fused parts are bonded and solidified to form a box-shaped body. It is something that can be converted into

[0009] The specific means of the forming apparatus for forming the container B from the developing plate A is comprised of a melting part 1, a pressing part 2, and a forming hole part 3, as shown in FIGS. Melting part 1
has two parallel heating blades (heating elements) 11 and a heating blade 11.
The pushing part 2 consists of a presser for pushing the developing plate A into the forming hole 3, and the forming hole 3 is formed from a planar projection of the developing plate A. It has an inclined inner wall surface corresponding to the planar projection of the container B to be inserted. Then, the developing plate A is supplied above the forming hole 3 (Fig. 3), and the melting part 1 is brought into contact with the developing plate A to thermally melt the surfaces of the predetermined acute angle grooves (c1, d2) (Fig. 4). ), Immediately after melting, the expanding plate A is pushed into the forming hole 3 by the pushing part 2, and the side plates b1 and b2 are raised to form a box-shaped container B (FIG. 5).

When melting the acute grooves (c1, d2), it is a matter of course that the angle Θ2 of the acute grooves is determined in advance, taking into account the shrinkage of the material during melting. Further, as shown in FIG. 6, if the two thermal blades 11 are made adjustable, even if the size of the expansion plate changes, it can be handled immediately.

Although the embodiments of the present invention have been described above,
It is also possible to stand up the side plate by melting the portion corresponding to the acute angle groove using only heat melting without forming the acute groove on the developing plate in advance, or use a developing plate with the acute angle groove pre-applied with hot melt adhesive. However, the container may be formed by heating and melting the adhesive using ultrasonic waves. Further, as long as the welding area can be heated and melted using two heating members arranged in parallel positions, only the edge d2 of the side plate b2 may be heated and melted, as shown in FIG. 7, without particularly heating the folded line. Furthermore, regarding the specific configuration of the forming device, for example, a receiving mold type may be used instead of a forming hole type, or it may be particularly equipped with a spreading plate supply section and a product discharge section. , or the melting section and the pressing section may be operated manually, which is completely arbitrary.

0012

[Effects of the Invention] The present invention is a method of forming a container by heat-melting only the parallel groove portions of a predetermined expansion plate and standing up the side plates on all sides. Because it is melted, it is easy to adjust the position of the hot blade even if the size of the expansion plate changes, and it also has the advantage of saving energy by reducing the number of melted parts.

[Brief explanation of the drawing]

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

[Figure 2] Plan view of the development plate

FIG. 3 is an explanatory diagram of the operation of the forming machine (when supplying a developing plate).

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

FIG. 5 is an explanatory diagram of the operation of the forming machine (when pushing the developing plate).

FIG. 6 is a diagram showing an example of a mechanism for moving the thermal blade.

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

[Explanation of symbols]

A　Development plate B Container a Bottom plate b1, b2 side plate c1, c2 bending plate d1, d2 Edge 1 Melting part 11 Heat blade (heating body) 12 Holding body 13 Vertical movement mechanism 2. Closet section 3 Formation hole part

Claims (4)

[Claims] [Claim 1] In a development plate with side plates arranged around the four peripheries of the bottom plate, at least two parallel edges of the side plates are arranged in parallel.
A method for forming a thermoplastic resin container, which is characterized by thermally melting with separate heating elements, simultaneously raising each side plate, and welding the melted parts. Claim 2: In a developed plate in which side plates are arranged around the four peripheries of the bottom plate, at least a pair of parallel V grooves are formed when forming the bending line and the end edge of the side plate, which is an extension thereof, into a cross-shaped V groove. A thermoplastic resin container characterized in that the grooves are formed in advance at an angle of about 90°, the other pair of parallel V grooves are formed by heat melting, and at the same time each side plate is erected and the fused parts are welded. Formation method. 3. In claim 2, the V-groove formed by heat melting is formed in advance at an acute angle from the 90° groove, the groove surface of this acute angle groove is heat melted, and at the same time each side plate is erected to form the fused portion. A method for forming a thermoplastic resin container, the method comprising welding. 4. A method of forming a thermoplastic resin container according to claims 1 and 3, wherein a hot melt adhesive is applied in advance to the parallel edges or acute grooves of the side plate.