JPS58220703A - Mold device - Google Patents

Abstract

PURPOSE:To obtain a mold device by which the product having a screw thread can be mass-produced by a vacuum forming, by attaching the mold for forming the product having the screw thread to a bed rotatively around the central axis of the screw thread. CONSTITUTION:A plurality of molds 16 is arranged in line on a water cooled bed 18 and is made to rotate by an axis 20. A heated plastic sheet 34 is placed on the mold 16 and is vacuum formed by reducing a pressure from the under side of the bed 18 and contacting it onto the inner face of the mold 16. Then, the mold 16 is slightly lifted with the formed sheet 34 by pushing up a rod 28 by a cylinder and raising a knockout plate 24. The bottom face of the mold 16 is parted from the bed 18, the top end of a bearing 22 is contacted to the under face of the bed 18 and a product is drawn off from the mold 16 by rotating along the screw thread 12 of the product.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold apparatus for molding a plastic product having a helical shape.

Conventionally, this type of product, for example, the cup-shaped product 10 shown in FIG. 1, has a spiral strip 12, so a method of using an integral type and extracting the product while rotating it after molding, or a method using a cracker. It could not be manufactured without this. Therefore, it is not possible to use the vacuum forming method in which many molds are installed side by side to mold many products from a single sheet at the same time, and it is therefore difficult to manufacture such products in large quantities at low cost. there were.

The present invention aims to overcome this difficulty and has a structure in which the mold is rotatably mounted on a stand.

Next, the present invention will be explained according to illustrated embodiments. 1
4 is a mold device of the present invention for vacuum forming a product 1o having a spiral strip 12, and is made up of a large number of molds 16 #16, . . . arranged side by side on a water-cooled table 18. This mold 16
has a cylindrical shape as a whole, and a female mold of the product 10 is formed on the inner surface above the center. The lower surface of the mold 16 is in surface contact with the upper surface of the table 18, and a shaft 20 is provided in the center. The shaft body 20 extends downward through the base 18, and a thrust bearing 22 is attached to the lower end. At this time, the bearing 22 is arranged so that there is a slight gap between the upper end and the lower surface of the table 18, so that the mold 16 rises slightly and can rotate with the upper end of the bearing 22 in contact with the table 18. 24 is the knock board and is gold! 16,16
．． ... is provided at the upper end of a holder 26 located between the two, and is raised by a rod 28 connected to a cylinder (not shown).

30 is an exhaust hole in the mold 16, and 32 is an exhaust hole in the stand 18.

This device operates as follows. When a heated plastic sheet 34 is placed on this device and the pressure is reduced from below the table 18, the sheet 34 is deformed and comes into close contact with the upper surface of the mold 16, thereby performing vacuum forming.

Next, when the rod 28 is pushed up with the cylinder and the knock plate 24 is raised, the mold 16 rises slightly together with the molded sheet 34, and the lower surface of the mold 16 separates from the base 18, as shown in FIG. , the upper end of the bearing 22 is brought into contact with the lower surface of the table 18, and the product rotates according to the spiral strip 12 of the product.As described above, when the molding device of the present invention is used, the product can be molded even if it has a spiral strip. It can be pulled out of the mold by simply pulling it straight out, and many molds can be placed side by side, so it is possible to use the vacuum forming method, which molds many products from one sheet at the same time, as in the example above. mass production can be achieved easily and inexpensively.

Furthermore, as in the above embodiment, the mold and the table usually make surface contact, and when the product is extracted, the mold rises slightly and separates from the table.
By configuring the lower end of the shaft to rotate while coming into contact with the underside of the table via a bearing, the mold is cooled well through surface contact with the table, and when the product is extracted, the bearing rotates smoothly, reducing the defect rate. , the failure rate can be reduced.

Therefore, since the present invention enables mass production of products having spiral stripes, it can be used to manufacture containers for iced confectionery and the like, and new designs having spiral stripes can be realized.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an example of a product with spiral stripes;
The figure is a perspective view of one embodiment of the present invention, Figures 3 and 4 are enlarged cross-sectional views of the main parts along the line ■-■, Figure 3 is the state before molding, and Figure 4 is the molded state. The state after the product is removed is shown. DESCRIPTION OF SYMBOLS 10... Product, 12... Spiral strip, 14... Mold device, 16... Mold, 18... Stand, 2
o-・Shaft body, 22-・・Bearing. Patent applicant Tomei Chemical Industry Co., Ltd.

Claims (1)

[Scope of Claims] 1. A mold assembly R6, in which a mold for molding a product having a spiral strip is attached to a stand so as to be rotatable around the central axis of the spiral strip. A shaft is provided that extends coaxially with the center axis of the strip and protrudes through the table. Usually, the lower surface of the mold and the upper surface of the table are in surface contact, and when the product is extracted, the mold slightly rises and separates from the table. The mold device according to claim 1, wherein the lower end of the shaft body and the white lower surface are rotatably contacted via a bearing.