JPS59201826A - Preparation of synthetic resin molded article - Google Patents

Abstract

PURPOSE:To obtain a molded article consisting of an expanded inner layer and a non-expanded skin layer, by a method wherein a non-expandable vinyl chloride paste layer is formed to the inner surface of a mold and, after the coated mold is filled with a pre-expanded expandable beads, said mold is heated to solidify the above mentioned non-expandable vinyl chloride paste. CONSTITUTION:Non-expandable vinyl chloride paste layer 21 are formed to the under surface of an upper mold 11 forming a cavity and the surface of the recessed part 12a of a lower mold 12 by coating or spraying. Subsequently, the coated recessed part 12a of the lower mold 12 is filled with pre-expanded expandable beads 4. Thereafter, the molds are heated to gel and solidify the above- mentioned paste layer 21 to convert the same to a non-expanded vinyl chloride layer 2 while the expandable beads 4 are further expanded to form a expanded molded body 3 and the molded one is taken out after cooling. By this method, a molded article consisting of an inner layer comprising the expanded molded body 3 high in expansion magnification and a skin layer comprising non-expanded vinyl chloride 2 is obtained.

Description

[Detailed Description of the Invention] Regarding A (Invention E Synthesis (+! 1 Resin Molded Molded Body J Notice)) d, 1. IJ has a non-foamed vinyl chloride skin layer J, the inner layer of the foamed molded body, etc. Items related to the production of synthetic resin molded parts d1 (d vines 1, ' This kind of synthetic wood 1j! is used as a molded body [J, 1 la-
Conventionally, the two-layer foam extrusion molding method has been known as a method for producing resin molded articles. This method involves simultaneous extrusion molding of vinyl chloride resin mixed with a foaming agent and vinyl chloride resin that does not contain any foam.
, t, one foaming occurs to form the inner layer, and the subsequent generation becomes the skin layer of Jl-foaming.

In this method, the foaming of the vinyl chloride resin that forms the inner layer (8 ratio can only be done with double culm).If the foam is 4ft high, and the inner layer expands, the outer shape of the unsolidified skin layer will change. This is because it will be damaged.

In view of the problems of the conventional methods described above, the present invention seeks to provide a method for manufacturing and covering a synthetic resin molded article having an inner layer with extremely high foamability and a non-foamed skin layer that maintains a precisely predetermined shape. It is.

In other words, the present invention applies coating or blowing (=J
After forming a non-foamed vinyl chloride paste layer to a predetermined thickness by t-pu, the mold is filled with foamable beads that have been expanded in advance, and the mold is heated to form each of the above-mentioned non-foamed vinyl chloride bases 1 to 3. It is characterized by solidifying.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

In Fig. '1, 11 is the upper die, and 12 is the lower edge. 1. Depending on the shape of the upper product: recessed part 12
a l) <Setting [J-(Yes, upper ffl 11
Then, by opening the lower mold 12, a mold 12 is formed. First, one surface of the upper mold 11 and the recessed part 12a of the lower mold 12, which form this one selvedge, are coated or sprayed.
J' 4: On J, a layer of non-foamed i, 7j X-vinyl base 1 to 21 is formed in a predetermined width of J52 (Fig. 1).

Chlorinated beer base 1-21 is converted into powdered JΔa and converted to Nil tree 1
There is also one that has a vine-like base 1 by adding θ plastic to 1f. Fill it up (see the same figure).After this, heat the cylinder to 120℃～・2
00° C. to glue and solidify the above-mentioned gelatinized beer hest 21, and add foamed beads/l to the non-foamed vinyl chloride 2. Sh.

After cooling, a foamed molded product 3 is formed (Fig. 2), and then ♂f-? Take it out (Figure 3). As a result, Sarame C-sho foaming (
It is made up of an inner layer made of a foamed molded product 3 of i3''+- and a skin layer made of IJIA vinyl vinyl of J1 light foam.

According to the method of the present invention, the foaming R rate of 1N vinyl chloride is 5 to 20 (73).
In addition to being able to obtain a light molded product by compressing the molded product, the molded product described above is hard and has high rigidity. In addition, the skin layer is held in a predetermined shape accurately by the mold, and the stripes and letters formed on the mold are transferred [this improves the design].
It can be made into a complex shape.

J3, the above actual hi! In one example, in order to improve the adhesion between the expandable beads 4 and the di-foamed vinyl chloride paste 21, it is preferable to fill the gaps between the expandable beads 4 with the base 1-.

As described above, according to the manufacturing method of the present invention, a synthetic resin molded article having an extremely foamed inner layer (5'9' high) and a non-foamed skin layer that maintains a precisely predetermined shape can be manufactured. It can be used in the production of vehicle plastic moldings 9 and 9 to achieve a crowd effect.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic diagrams showing one embodiment of the present invention. 11, 12...1111] 2...Non-foamed vinyl chloride 3...Foamed molded product 21...Non-foamed vinyl chloride base 1-4...Light? a.

Claims (1)

[Claims] ? After forming one layer of non-foamed j!lli hardening base 1 on the specified p/m by 4 steps, apply foam beads pre-filled with foam C. The inner layer of the foam molded product and the opening for solidifying each of the above-mentioned non-foamed vinyl chloride bases by filling the mold with heat and solidifying the non-foamed vinyl chloride base. A method for manufacturing the epidermal layer J, Rinaru synthetic (h・) formed form) 4\.