JPS6248738A - Production of expanded polystyrene product having granular surface - Google Patents

Abstract

PURPOSE:To produce a product having the surface with good touch, showing appearance of steadiness, by heat-treating a molded article of expanded polystyrene to form granular faces on the surface. CONSTITUTION:A molded article expanded polystyrene is heat-treated at 150-220 deg.C and the surfaces are made into granular faces to give a product. For example, the heat treatment is carried out by bringing hot air into contact with the molded article while transferring it to a tunnel type heater by a belt conveyor. A honeycomb pattern caused by expansion of individual pellet of particular expanded polystyrene disappears, is not striking and shows uniform and heavy and profound appearance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing expanded polystyrene products having grain surfaces that are pleasant to the touch and have a calm appearance.

[Conventional technology]

Conventionally, expanded polystyrene products have often been used for containers, etc., but pellets containing a foaming agent are used to manufacture slightly larger containers, etc. Expanded polystyrene products using these pellets as a starting material have an expanded surface of the pellets. This creates dense and dense areas that look like a honeycomb pattern, and has properties such as insulation, etc.
Although it is functionally sufficient, it has a poor feel and looks inferior.
Improvement was long awaited.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a foamed polystyrene product with good appearance that eliminates the drawbacks of conventional foamed polystyrene products.

Means for Solving Problem C] The present invention provides a foamed polystyrene product in which a foamed polystyrene molded body is heat-treated to form grain surfaces on the surface.

Next, the structure and operation of the present invention will be explained in detail with reference to the drawings.

[Example 1] FIG. 1 is a conceptual front view showing a method for manufacturing a foamed polystyrene product 5 having a grain surface 6 according to the present invention. Second
The figure shows a perspective view of a foamed polystyrene product 5 according to the present invention. FIG. 3 is also a sectional view taken along the line 1--III in FIG. 2.

In order to manufacture the foamed polystyrene product 5 having the grain surface 6 according to the present invention, a tunnel hot air furnace 2 is used as shown in FIG.
It is suitable to use a tunnel-shaped heating device 1 comprising a conveyor 3, for example a belt conveyor, which can pass through the hot air oven. Tunnel hot air stove 2 is 1
The furnace temperature was maintained at 50-220°C, with a preferred temperature of about 180°C.

After adjusting the temperature inside the tunnel hot air stove 2 to 180°C,
At a conveyor speed of m/min, a block-shaped foamed polystyrene molded body 4 surrounded by a smooth surface formed by a conventional method using a mold was fed into the tunnel-shaped heating device 1. 1
After 0 seconds to 3 minutes, the molded product 4 was turned into a foamed polystyrene product 5 from the tunnel hot air oven 2 and sent out from the other end of the hot air oven.

As shown in FIGS. 2 and 3, this block-shaped expanded polystyrene product 5 has a uniform surface and a dense grain surface 6, and has a honeycomb structure due to the expansion of individual pellets peculiar to expanded polystyrene. The pattern disappeared and was not noticeable, giving a homogeneous and solid appearance.

As the surface becomes a grain surface 6, the feel in the hand becomes noticeably better, and the luster that was seen in the molded product 4 before heat treatment is less noticeable and subdued in the product 5 due to the grain surface 6. It gave the impression of a superior luxury product.

The reason why the temperature was limited to 150 to 220°C in the furnace was as follows.
This is because at a temperature of 150° C. or lower, the heat treatment takes a long time and the surface of the molded product is difficult to form a uniform grain surface. Also 2
This is because at temperatures exceeding 20°C, the surface of the compact melts and it is difficult to form a uniform grain surface.

[Example 2] Hot air was blown onto the same polystyrene molded body as in Example 1 using an industrial dryer capable of generating hot air at 150°C.

Hot air was carefully blown onto each side of the molded body to obtain a product having grain surfaces on each side.

However, it was confirmed that the method using an industrial dryer requires labor and a large amount of heat, and tends to cause unevenness in the product.

Even when the foamed polystyrene molded body was used as a container, a product having a granular surface on the surface could be obtained.

〔Effect of the invention〕

According to the present invention, there are the following effects.

■ The honeycomb pattern before heat treatment becomes inconspicuous and the grain surface becomes dense, giving it a calm, high-quality appearance. ■ It feels better to the touch than before treatment.

[Brief explanation of drawings]

Fig. 1 is a conceptual front view showing a method for manufacturing a polystyrene foam product having a grain surface according to the present invention, Fig. 2 is a perspective view of an example of a polystyrene foam product according to the present invention, and Fig. 3 is a diagram showing the method of manufacturing a polystyrene foam product having a grain surface according to the present invention.
It is a sectional view taken along the -m line. 1: Tunnel type heating device 2: Tunnel type hot blast stove 3: Conveyor 4: Polystyrene foam molded product 5: Polystyrene foam product 6: Grain surface

Claims (1)

[Claims] 1. A molded article based on expanded polystyrene of 150 to 220
1. A method for producing a foamed polystyrene product having a granular surface, which is characterized by heat-treating at a temperature of °C to form a granular surface on the surface.