JPH02121823A - Manufacture of hollow multi-wall panel - Google Patents

Abstract

PURPOSE:To obtain a product having arbitrary thickness without deformation after superposing and without increase in its cost by setting first hollow double- wall panel in the cavity of one split mold, and blow molding a second hollow double-wall panel in a state to be fusion-bonded to the first panel. CONSTITUTION:A first panel A is blow molded, molds are then opened, and both split molds 1, 2 are opened in a state that the panel A is set in the cavity 1a of the first mold 1. The second mold 2 is retreated at a distance corresponding to the thickness of a second panel B from the mold clamping face 3a of a shutter 3, and a second parison 5b is suspended to be disposed between both the molds 1 and 2 in this state. Then, the molds 1, 2 and the shutter 3 are clamped similarly to a first blowing step, pressure fluid is introduced to a second parison 5b to expand it to mold the second panel B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a hollow multi-wall panel made by laminating at least two hollow double-wall plastic panels.

[Conventional technology]

Panels made of hollow double walls made of plastic are molded by blow molding, and are generally widely used as constituent members of box-shaped parts such as electrical equipment and other wall materials. In the case of this hollow double wall panel, if it has a relatively small plane area, it has relatively high rigidity, but if it has a large area compared to its thickness, there is a problem in its rigidity.

Therefore, when constructing a panel having a large planar area using a hollow double wall panel, a plurality of the above-mentioned hollow double wall panels, at least the second of which is laid together, is used as a hollow multiple wall panel.

Conventional methods for manufacturing the above-mentioned hollow multi-walled panels include methods such as attaching each panel that has been separately blow-molded with an adhesive, or heating and welding the joints together.

[Problem to be solved by the invention]

The conventional manufacturing method for hollow multi-wall panels described above requires processes such as adhesive application, heating, and pressure in addition to the blow molding process, resulting in high manufacturing costs and stacking. Since the joining process is a separate process after blow molding, the panel may be deformed in this process, resulting in a problem of poor product yield. Furthermore, according to the conventional manufacturing method, the product thickness is an integral multiple of the thickness of a single hollow double wall panel, and if you try to obtain a thickness other than that, the thickness of the single hollow double wall panel However, it is extremely disadvantageous in terms of molding cost to separately mold multiple types of hollow double wall panels with different thicknesses.

The present invention has been made in view of the above, and is based on the hollow 2
Hollow multi-walled panels made by stacking multiple panels with a heavy wall structure can be produced at low cost without deformation after stacking, and products of any thickness can be obtained without increasing costs. The object of the present invention is to provide a method for manufacturing a hollow multi-wall panel.

[Means to solve the problem]

In order to achieve the above object, the method for manufacturing a hollow multi-wall panel according to the present invention includes disposing a first parison between split molds having cavities for the hollow double-wall panel, After blow molding the heavy wall panel, the mold is opened, and then, with this first hollow double wall panel set in the cavity of one of the split molds, a second parison is placed between the two split molds. , Then, the two split molds are inserted into the second hollow 2
The molds are clamped so that they are spaced apart by the thickness of the heavy wall panel, and a parison is sandwiched around the two split molds, and then a second hollow double wall panel is formed using this second parison. Blow molding is performed in a state where it is welded to the first hollow double wall panel.

[For production]

The first and second hollow double wall panels are welded over their entire surfaces.

Further, the shape of the welded surfaces of both hollow double wall panels is molded into a desired shape when the first panel is molded.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

In the figure, 1.2 is the first and second split molds arranged oppositely,
The first split mold 1 has a cavity 1a corresponding to the thickness of the first panel, and the second split mold 2 has the same opening shape as the cavity 1a of the first split mold 1. and
The end face forms a cavity 2a having a convex portion for forming ribs. And on the outer periphery of this second split mold 2,
A shutter 3 having a mold clamping surface 3a opposite to the mold clamping surface 1b of the first split mold 1 is fitted so as to be slidable in the mold clamping direction. The positions of the second split mold 2 and the shutter 3 can be arbitrarily shifted in the mold clamping direction.

A method of manufacturing a hollow multi-wall panel according to the present invention using the above-mentioned apparatus will be described below.

First blowing process (FIGS. 1 and 2) With the cavity 28 surface of the second split mold 2 and the mold clamping member 3a of the shutter 3 being flush, both split molds 1.
A first parison 5a of plasticized and melted thermoplastic plastic is extruded from the extrusion head 4 and is placed in a suspended position between the two (FIG. 1).

Then, both molds 1 and 2 are clamped. At this time, the second split mold 2 and the shutter 3 integrally perform a mold clamping operation. Thereafter, pressure fluid is introduced into the parison 5a from the blow nozzle 6 to expand the parison 5a and form the first panel A (FIG. 2). At this time, the weld rib 7 is formed on the second split mold 2 side of the panel A.

Second blow process, (Figures 3 and 4) After the first panel A is blow-molded, the mold is opened, and this panel A is set in the cavity la of the first split mold 1, and then divided into two parts. Leave mold 1.2 open. Further, the second split mold 2 is moved back from the mold clamping surface 3a of the shutter 3 by the thickness of the second panel B, and in this state, both split molds 1,
A second parison 5b is placed hanging between the two (Fig. 3).
.

Next, both the split molds 1.2 and the shutter 3 are clamped in the same manner as in the first blowing step, and the second Paris thread 5b is closed.
Pressure fluid is introduced into the chamber to expand it and form the second panel B (FIG. 4).

At this time, one side of the second panel B is the same as the first panel A.
Since the second panel B is formed along the opposing surfaces of the first panel A, the second panel B is overlapped with the first panel A without any gaps, and is welded over the entire opposing surface. The mating surfaces of both panels A1B are determined by the cavity shape of the second split mold 2.

When three or more sheets are stacked, the same steps as the second blowing step are repeated one after another. The thickness of each of the overlapping panels can be arbitrarily adjusted by adjusting the protrusion dimension of the shutter 3 with respect to the second split mold 2 and changing the depth dimension of the cavity on the second split mold side.

FIG. 5 shows a hollow multi-walled panel formed by the above process, and a weld rib 7 formed by a convex portion provided in the second split mold 2 is formed in a concave shape on the negative side of the panel.

6 to 10 show a second embodiment of the present invention.

In the first embodiment, since the cavity 2a of the second split mold 2 was provided with a recessed part for the weld rib,
The weld rib 7 is formed on one side of the hollow multi-wall panel after molding, but in this second embodiment, a hollow multi-wall panel without concave ribs on the surface can be molded.

That is, the second split mold 2' is provided with a slide core 8 for weld ribs so as to be able to protrude and retract from the surface of the cavity 2a'. Each slide core 8 is connected to a drive device such as a cylinder device (not shown), and can be controlled in position so that its tip surface protrudes, retracts, or is flush with the surface of the cavity 2a'. .

A manufacturing method using this device will be explained below.

First blowing process (Fig. 6, Fig. 7) Slide core 8 of the second split mold 2° with the mold opened
selectively, for example, alternately protruding and recessing. Thereafter, the first panel A' is formed by the same steps as the first blowing step of the first embodiment. At this time, a weld rib 7° is formed by the slide core 8 on the protruding side, and a protrusion 9 is formed by the slide core 8 on the retracting side on the 2° side of the second split mold of the panel A°.

Second blowing process (Figures 8 and 9) After blow molding the first panel A', the mold is opened, and the Konohaneru A' is set in the cavity 2a of the first split mold 1 in the open state. Then, the tip surfaces of all the slide cores 8 of the second divided mold 2° are set so as to be flush with the cavity 2a surface of the second divided mold 2°. Thereafter, a second panel B' is formed by a process similar to the second blowing process of the first embodiment.

As a result, the surface of the second panel B' becomes flat like the surface of the first panel A°, and therefore, according to this embodiment, a hollow multi-wall panel with both sides flat is formed. (Fig. 10), and weld ribs 7'' 9a are formed between the first and second panels A' and B'.

Note that in this embodiment as well, 3
It is possible to superimpose more than two layers.

In the above embodiment, an example was explained in which a shutter was used as a means for holding the parison around the mold. It is also possible to have a movable mold inside the type mold, and to hold the parison between the split type molds themselves.

〔Effect of the invention〕

According to the invention, the panel A has a hollow double wall structure.

A hollow multi-wall panel formed by laminating BSA''B'' can be obtained at low cost, without deformation after lamination, and with any thickness without increasing cost.

[Brief explanation of drawings]

1 to 4 are process explanatory diagrams of the first embodiment of the present invention, FIGS. 6 to 9 are process explanatory diagrams of the second embodiment of the present invention, and FIGS. 5 and 10 are process explanatory diagrams of the second embodiment of the present invention. It is a front view of the molded article by each Example. 1.2.2° is a split mold, la, 2a, 2a are cavities, 3 is a shutter, 5a, 5b are parisons, ASB, A
'B' is a hollow double wall panel.

Claims (1)

[Claims] A first parison is placed between split molds having cavities for hollow double wall panels, the first hollow double wall panel is blow-molded, the mold is opened, and then this first hollow double wall panel is manufactured. is set in the cavity of one of the split molds, and a second parison is placed between the two split molds.Then, both split molds are inserted into the mold by the thickness of the second hollow double wall panel. At the same time, a parison is clamped around the two split molds, and then the second hollow double wall panel is attached to the first hollow double wall panel using this second parison.
A method for manufacturing a hollow multi-wall panel, characterized in that the hollow multi-wall panel is blow-molded in a state welded to the multi-wall panel.