JPS59212210A - Molding method of product of high molecular compound - Google Patents

Abstract

PURPOSE:To obtain a spewless product by a method wherein a mold in which the inside at least is made up of porous material through which the air can be exhausted outside said mold is charged with an unprocessed piece provided with a film that can permeate air only through a portion abutting upon said porous material and then said piece is molded. CONSTITUTION:Inside the mold 1 having holes 3 filled by caulking with hard porous material 4 in the inside opening portions of many small exhaust ports 2, the surface of the region 32 corresponding to the porous material zone of said mold on the outer surface of an unprocessed (unvulcanized) tire 30 is charged for vulcanization and molding with a matter covered stickily with a film 34 such as a tetrafluoroethylene sheet that permeates air but does not permeate polluting materials such as oil, polymer components and adheres well to the tire after vulcanized. In this manner, since the porous material zone of the mold does not jam up, a spewless product of good appearance can be obtained.

Description

[Detailed Description of the Invention] (Field of Application of Industry) The present invention relates to products of polymeric phase materials such as rubber and synthetic resins,
This is related to a number of methods for molding rubber tires.

(Prior art) For example, a mold for molding a rubber tire e is molded (1) with a large number of air holes to prevent external defects of +ρ products caused by air pockets. 11: However, during vulcanization, rubber flows into these exhaust holes and the rubber protrusions called spiules remain on the surface of the product, so these spiules must be removed during the finishing process. This is done by hand or with a spit trimming machine, but both are time-consuming and leave traces of removal, which are undesirable from a medical standpoint.Furthermore, there is a problem with the materials used. , the inner surface of the mold is a metal sintered body,
It is formed from a porous material such as ceramic sox or Vycor glass, and the 8 parts of this porous material and the outside of the mold are connected with a vent hole, so that when a rubber tire, etc. is heated and pressurized in the mold, the inner surface of the mold and the rubber tire are connected. Attempts have been made to use a porous material to discharge the air trapped between the mold and the mold surface to the outside of the mold. In this method, the rubber V used for rubber tires gains fluidity by heating, but due to its high viscosity, it does not flow into the porous material, so it is unlikely to cause spills that would break the conventional method. Also, unmolded rubber tires, etc.
The generated finish is 0 (1st row is oil, polymer;
1-1 In other words, τ causes the original glue I air bacteria, l118
The mold is damaged and cannot be used again! According to it, when did it happen?

(ILi'J of description) The above-mentioned 11 (erasing, the product of Spiures) ``1yha'' mold τ1 〈υ〉〈〈〈〈〈〈〉〈〈〈〉
1'2 'I'! The purpose is to provide one method.

(Light 11) 1! 1゛11) L, tL! To make it target r41+7, book j? 5. The inner curved part of the mold is the metal 1. σ) The body is porous 1! I
E To'Cj form 1rlx L,)) 1J inscription 1017''
, the No. 13 polymorphic material σ has a shape of 1, and the small hole τ is sunk by using the U part 27 and the mold exterior 2 in parallel.
During molding, the strained molding mold is removed so that the air inside the mold is expelled, and the porous portion of the mold is placed on the outer surface of the unmolded product. Sex.

It is characterized by molding a product made of polymer 411 with a thin film pasted on it that does not rub off, but does not stain the area with +1 CA.

(S 3 Rikiya 1 row) Please refer to the drawings of the present invention as an example of a rubber tire! (This will be explained in detail below.

As shown in Figure 431, a large number of small holes 2 (9C) in the mold 1 (
Hole S (+a: diameter 5--2
3 RNA, depth 51) was drilled, and in the hole, a hard U porous hole 1 in the shape of V and 7 holes was caulked with plug 4 made of stainless steel sintered plate. be. Second
As shown in the figure, the OCR father is segmental mold 10
In this case, the entire upper half and lower half of the 1/< turn section are covered with a stainless steel plate 12.
As shown in the figure, it is also possible to make the entire mold 0 with a porous scoop. In this case, a small exhaust hole is not required. The porous material a may be a metal sintered plate, ceramics, Vico 7 Regis, carbon, etc.

- It is connected to the rank M n 1 st and tie to 1 11 of 1 type t i 1 and ki, com or mold will be kahong na pressure between the tire surface and 1 shinono inner table 1 t The accumulating powder −℃ is a porous material′α
The name of the club was changed and it was transported to the monk's office.
This (+iE person 1- does not happen, so Spiyu is fb
41F.

- [I got a subic coreless tire. do.

As shown in Figure Y84, non-bE type (terminal vehicle) cross-ply structure tire 30 (Figure 4 ■) or radial fiber purchased iM tire 31 (t, g4 figure @) outside & blood stains. b, 619 in the porous material 'σ forming part of the +il mold
Clothes.

For example, the shaded areas 32 and 36i shown in the figure are 111° transparent.
31 attack j41-! Thin film 54 (14th 107th to 05th), where the contact between the rubber and the σ contact with the thread tie is excellent. Then, place a sheet of 47-no-ethylene on the surface and attach it on the surface.

- An unformed tire that has been processed as described in 1 above.
Load it into a 1k.tz 1ii and perform vulcanization molding using the normal method.

Inventive method? As shown in FIG. 5, the finished tire thus formed has a thin film 64 (dotted line) integrally bonded to the tire surface.

(Young Fruit of the Invention) As described above, the present invention utilizes the porosity provided in the mold to remove air accumulated in the mold during molding. 1-j) A thin film that allows air to pass through but does not pollute contaminants is attached to a specific area on the surface of the product. The mold can be used repeatedly for a long period of time without the problem of clogging of the φ-porous part due to contamination, and there is no need to remove the spill. It became 1-chome P2.

[Brief explanation of drawings]

Figures 1 to 6 are partial views in the tire radial direction showing examples of molding molds that can be used in the method of the present invention, and Figure 4 OO is an unmolded (unvulcanized) cross ply in the method of the present invention. Figure 71.45 shows a tire and a radial ply tire with a thin film attached to the poor durability area. be. 1.1o, 2u...molding mold, 2...exhaust hole (
ben1-hole), 4,12.21... porous material'a
, s u , s 1-tire, 52.56...
Thin film pasting 1': I evil area, 64... grieving, 65... par 9 turns. Specially Applicant Sumitomo Rubber Industries Co., Ltd.

Claims (1)

[Claims] The inner surface portion of the mold or the entire mold is formed of a porous material 'U, and the inner surface portion of [111] is formed of a porous material ゜a of the form IJli. Shitagi has a small exhaust hole that connects the porous part 78 with the outside of the mold to remove air that accumulates inside the mold during molding by υ1.
Using a molding mold that allows air to flow out, air is poured through the area of the outer surface l of the unmolded product that corresponds to the porous material 14'ff11 of the mold, but lθ