JPH02286234A - Manufacture of foamed styrene resin sheet with straight grain pattern - Google Patents

Abstract

PURPOSE:To obtain the laminated sheet having almost natural straight grain with light and shade and differently sized lines by laminating the film of styrene- butadiene block copolymer resin SBBC having the straight grain pattern with light and shade is laminated on at least one surface of foamed styrene resin sheet, as a skin. CONSTITUTION:SBBC becoming a skin is melted in a first extruding machine and is introduced in a mold. A plurality of the grooves of 0.5R-0.75R having different width and depth are provided in a used mold laterally in a row. While the extruded SBBC film is still in softened state, the styrene resin containing foaming agent is extruded from a second extruding machine and becomes a foamed styrene resin sheet, and then by pressure-bonding them with a roll, the SBBC film and the foamed styrene resin sheet are integrally laminated mutually, whereby the beautiful laminated sheet having the pattern with light and shade surface and almost straight grain of some uneven surface, is obtained. When the film of synthetic resin e.g. polystyrene or high impact polystyrene is intended to be laminated on the rear surface, a similar process is achieved by using a third extruding machine.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a styrene-butadiene block copolymer resin (hereinafter referred to as 88B
The present invention relates to a plate material made by laminating films (referred to as C) and a method for producing the same, and further relates to a beautiful three-layer board material for boxes with excellent strength and made by laminating a synthetic resin film on the back side.

[Conventional technology]

A foamable resin and resins with different compositions are spread into sheets and made into a laminate in the same mold, and then a large number of protrusions are formed on the foaming agent-containing resin sheet in the extrusion direction. A method has been proposed in which a flat laminate is crushed in the same nozzle, extruded from the tip of the nozzle as a flat laminate, and foamed to produce a foamed resin laminated sheet with a striped pattern.
746).

In addition, when forming a straight-grained pattern on a resin foam, there is a method of forming peaks and valleys when extruding the foam, and then crushing these to form a straight-grained pattern using the difference in density between the valleys and peaks. It has been proposed (Special Publication No. 52-49822, Special Publication No. 53-2180).

[Problem that the invention attempts to solve]

In the above conventional method, the surface skin layer and the foamable resin layer are laminated in the same mold, and then a large number of protrusions facing the extrusion direction are formed in the same die, so that A number of concave grooves of the same width extending along the flow direction of the resin are provided, and then the grooves are removed to produce an 8!1-layer sheet of foamed resin with a striped pattern using an open mouthpiece. However, this method has the following drawbacks:

■ Foamed resin with many ridges of the same shape,
Pre-foamed #J fat with a different composition is slightly sagging in the same nozzle,
After crushing the protrusion, it is extruded out of the mouthpiece and foamed.
A striped pattern is formed because the foaming state is different in parts with ridges and other parts, but the pattern is a monotonous striped pattern consisting of uniform lines, and has no shading and is far from natural straight grain. I can only get it.

- After the ridges of the foamed resin sheet are formed, they are crushed, but since distortions inevitably remain, the resulting sheet is likely to break along the striped lines.

The present invention was created in order to eliminate the above-mentioned drawbacks, and the straight-grain pattern is not monotonous with a uniform line pattern, but is a natural straight-grain pattern with shading and different line thicknesses. It is very close to . Moreover, the straight-grained horizontal pattern is not formed on the foamed resin layer like conventional products, but on the 5B which becomes the skin.
Since it is formed on a BC film layer, it does not have the disadvantage of being easily broken.

[Semi-immersion and effects for solving the problem] The present invention has the following features:
The skin having a straight-grained pattern with shading is formed from 19BBC film, and is produced by laminating this skin on a foamed styrene resin sheet extruded from another extruder and pressing it with a roll. will be described in detail below with reference to the drawings.

First, the 5BBC that becomes the epidermis is commercially available as Asahi Flex (manufactured by Fukkasei Co., Ltd.) or K Resin (manufactured by Philip Co., Ltd.), and is usually colored with a coloring agent and melted in the first extrusion mode. , introduced into the mold. The mold used here is provided with a large number of concave grooves of different widths and depths in a horizontal row.

The width and depth of this groove may be arbitrary, but usually 0.5R
It has a U-shaped, semicircular or U-shaped cross section with a diameter of about 0.75 mm, and the semicircular shape is particularly preferable because it is easier to process. The mold uses a coat hanger type T-die, and the tip of the cap is S.
In the case of about o o mm, the number of concave grooves is about Q, 7 mm
It is preferable to provide 100 to 200 pieces at intervals, or about 50 pieces when the tip part is 100 mm and the cap interval is Q and 3 mm. 5BBC in a mold with many grooves with different widths and depths! By passing 5BBC
! Many protrusions are formed on the film-like material, but the amount of resin in these protrusions varies depending on the volatiles in the concave grooves, so areas with a large amount of resin are dark colored, and areas with a small amount are light colored, and the protrusions also have different amounts of resin. The shapes can also be extruded from the mold tip with different widths and heights.

While the 8BBC film thus extruded is still in a softened state, styrene resin containing a foaming agent is extruded from a second extruder, laminated on the foamed styrene resin sheet, and pressed with a roll. According to the above 5BB
The C film and the foamed styrene resin sheet are integrated with each other in a frame 70, and a beautiful foamed styrene resin laminated sheet having a pattern similar to natural straight grain with a slightly uneven surface and a shading surface is obtained.

In addition, when laminating a synthetic resin film such as polystyrene or high impact polystyrene on the back side, the third
A 3N laminated foamed styrene resin sheet can be obtained by performing the same operation using an extruder.

The thus obtained expanded styrene resin sheet is used as an S BBC with hinge properties to become the skin when being processed into side panels for boxes.
! The box can be easily assembled by V-cutting with the film left behind, and is made of expanded styrene resin with an 88BC film layer with a straight grain pattern on the surface and a styrene or high impact styrene resin film layer on the back. In the case of a laminated sheet, the strength is even higher, so that it can be used as a board material for boxes that can also be used for packaging purposes, so the styrene resin foam sheet having a straight grain pattern of the present invention has great practical value.

〔Example〕

The straight-grain pattern forming mold uses a T-die, and the tip of the nozzle has a diameter of 100 mm.
mm, and the cap spacing Q was 3 mm.

Fifty concave grooves were provided with a radius of 0.5R to 0.7R and a semicircular cross section with a width and depth corresponding to the desired straight grain pattern.

5BBC uses Asato Flex (manufactured by Fukkasei Co., Ltd.), adds a small amount of brown pigment to it, and passes it through the mold described above to form protrusions with different amounts of resin on the 5BBO film. Ta. This was extruded through a die to obtain a film having a linear pattern of light and shade of brown formed thereon. After this film was extruded from the die, a mixture of 100 parts by weight of polystyrene containing 23% pig, 2 parts by weight of talc, and a small amount of cream color pigment was extruded from another T-die, and the 5B
While the BC film was in a softened state, it was laminated onto a foamed styrene resin sheet and pressed with a roll.

The obtained sheet is coated with 50
It had a smooth straight grain pattern with 0 lines.

The sheet had a thickness of 4 mm, a density of 0.511/cc, and a width of 8 Q mm.

On the back side of the expanded styrene resin sheet obtained as described above, a high impact polystyrene film (manufactured by Mitsui Toatsu) is extruded from another extruder [11] to obtain a three-layer laminated sheet with high bending strength. was completed.

[Brief explanation of drawings]

FIG. 1 is an overall view of the process of the present invention, FIG. 2 is a cross-sectional view of a mold used in the present invention, and FIG. 3 is a cross-sectional view and a plan view of the sheet of the present invention. Figure 1 Seat sectional view Figure 3 Seat plan view Figure 2 To Xf'XJNI-1

Claims (3)

[Claims] (1) A foamed styrene resin laminate sheet formed by laminating a styrene-butadiene block copolymer resin film having a shading straight grain pattern as a skin on at least one side of a foamed styrene resin sheet. (2) Expanded styrene resin made by laminating a styrene-butadiene block copolymer resin film with a shading straight grain pattern on one side of an expanded styrene resin sheet, and a polystyrene or high-impact polystyrene resin film on the other side, respectively. Laminated sheet. (3) Using a mold in which a number of concave grooves with arbitrarily different widths and depths are arranged in a row, the styrene-butadiene block copolymer resin film extruded in a molten state from an extruder is passed through the mold. , forming a large number of protrusions with different amounts of resin on the film, and placing the styrene-butadiene block copolymer resin film in a softened state on a foamed styrene resin sheet extruded from a mold of another extruder. A method for producing a foamed styrene resin laminated sheet having a straight-grained pattern with shading, characterized by laminating the sheets while the sheets are in the same position and pressing them together with a roll.