JPH05237919A - Manufacture of fiber composite molded product - Google Patents

Abstract

PURPOSE:To smoothen the surface of an extruded fiber composite molded product. CONSTITUTION:In the method for manufacturing a fiber composite rain gutter, the outer face of a fiber composite rain gutter 12 composed of a fiber reinforced thermoplastic resin core material 7 and a thin coated layer 35 formed by extrusion coating both faces of the core material with thermoplastic resin is vacuum- cooling sized and the inner face is simultaneously cooling sized while pressurizing the inner face of the rain gutter by the pressure of 0.1-5kg/cm<2>.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber composite molded article.

[0002]

2. Description of the Related Art In the method of producing a molded article by sizing a synthetic resin after being extruded from an extruder, the following sizing methods have been conventionally known.

(A) When the molded product is a pipe, as shown in FIG. 7, the pipe (62) immediately after molding is passed through the sealed water tank (61), and the water spraying device (63) is placed in the water tank (61). ) By passing pipe
Water is sprayed on (62), and the inside of the water tank (61) is evacuated by a vacuum suction pipe (64) provided on the upper wall (61a) of the water tank (61) and connected to a vacuum device (not shown). , Front wall of aquarium (61) (6
This is done by passing the horizontal short tube portion (66) provided on the inner surface of 1b) and having a large number of vacuum suction holes (65) on the peripheral wall.

(B) When the molded product is a deformed product, as shown in FIG. 8, it has an inner peripheral surface (67) matching the contour of the deformed molded product, and the bottom surface of the inner peripheral surface and both lower side surfaces. Slits (68) are formed in parallel with each other, a vacuum suction port (69) is provided in the back of each slit (68), and a water channel (70) connected to a cooling water source is provided. -The die (71) was used for vacuum suction from the vacuum suction port (69) in the slit (68) while indirectly cooling the irregularly shaped product immediately after molding.

(C) When the molded product is in the form of a sheet, the upper sizing die (7) is disposed so as to face each other vertically.
6) and lower sizing die (72) are each cooled with water,
The sheet-like molded product (73) immediately after molding is passed between the upper and lower sizing dies (76) (72) and the cooling surfaces (74) (75) alternately provided on the upper and lower sizing dies (76) (72). The sheet-shaped molded product (73) was suction-adhered to ().

[0006]

When the above-described conventional sizing technique is applied to a fiber composite material in which a thermoplastic resin is coated on a fiber-reinforced thermoplastic resin core material having irregularities, the following problems occur.

That is, in the case of (a), the cooling inevitably varies, so that a difference in shrinkage occurs in the thickness direction and a reinforcing fiber pattern appears on both the inner and outer surfaces of the pipe. Further, in the case of the above (B), only the bottom surface and both lower side surfaces of the irregularly shaped product can be obtained as smooth surfaces. In the case of (c) above,
Since the sheet-shaped molded product is sequentially contacted with the cooling surfaces alternately provided on the upper and lower sizing dies and vacuum-vacuated alternately, one-sided smooth surface obtained by vacuum suction in the previous stage, In the next step, contraction occurs because the other surface is vacuumed. The same applies to the other surface that has been smoothed by vacuum suction. Therefore, the reinforcing fiber pattern of the core material eventually appears in the coating layers on both sides, and there is a problem that a smooth molded article as a whole cannot be obtained.

An object of the present invention is to provide a method for producing a fiber-composite molded article, which can finish both surfaces smoothly even though the coating layer is thin.

[0009]

According to a first aspect of the present invention, there is provided a method for producing a fiber composite molded article comprising a fiber-reinforced thermoplastic resin core material and a thin-wall coating formed by extrusion coating thermoplastic resin on both surfaces thereof. It is characterized in that one side of the fiber composite material consisting of layers is subjected to vacuum cooling sizing, and at the same time, the other side is subjected to cooling sizing while being pressurized at 0.1 to 5 kg / cm ² .

According to a second aspect of the present invention, there is provided a fiber composite molding comprising a fiber reinforced thermoplastic resin core material and a thin wall coating layer formed by extrusion coating thermoplastic resin on both surfaces of the fiber composite. It is characterized in that one side of the material is vacuum-cooled and sized while the other side is pressurized while being pressed by a flexible pressurizing body impregnated with a cooling liquid.

In the invention of claim 1, the pressing force is 0.1.
The reason for limiting the ~5kg / cm ² is not smooth surface is obtained in the molded article is less than 0.1 kg / cm ^2, it exceeds 5 kg / cm ^2, because the molten resin is clogged sizing device.

Specific examples of the cooling liquid in the invention of claim 2 include water and oil, and the cooling temperature is preferably up to 80 ° C. Further, specific examples of the pressure body having flexibility include felt and thick cloth. As this pressurizing body, the degree to which one side of the molded product can be smoothed by the restoring force when compressed, that is, 0.1 to 5
Those that generate a pressing force of kg / cm ² are selected.

As the core material, a large number of rovings, non-woven fabrics, woven fabrics and nets made of inorganic fibers such as metal fibers and glass fibers and organic fibers such as aramid fibers and cotton fibers are impregnated with thermoplastic resin powder such as vinyl chloride resin. The thickness is 0.02 mm to 1 mm.

As the thermoplastic resin, a resin having good weather resistance such as a vinyl chloride resin, an acrylic resin, a copolymer thereof or a nylon resin is preferably used depending on the purpose of use of the product. The thickness of the thin coating layer is usually 0.2 to 1 mm on one side. The thickness of the fiber composite molded article after extrusion coating is preferably 0.5 mm to 3 mm, more preferably 1 to 2 mm.

[0015]

Since the method for producing a fiber composite molded article according to the present invention has the above-described structure, both sides of the fiber composite molded article are smooth.

[0016]

【Example】

Example 1 This example shows an example in which the present invention is applied to a fiber composite rain gutter as a molded product. First, the manufacturing process of this rain gutter will be described with reference to FIG.

A sheet-shaped fiber-reinforced thermoplastic resin core material (1) is wound around an unwinding roll (2) while the core material (1) is being unwound while a heat shaping device (3) is used to form a cross-section of approximately U. Gutter body
(4) is shaped, and the upper ends of both side walls are gradually wrapped around a pair of left and right rectangular rod-shaped horizontal cores (5) to form hollow ears (6) to form a trough-shaped core material ( 7)

Further, a gutter-shaped core material having a predetermined cross section
Inserting (7) into the crosshead die (10) connected to the extruder (9) while guiding the hollow ears (6) through the rod-shaped horizontal cores (5), and the thermoplastic resin was applied to the entire peripheral surface. The resin is melt-extruded and coated, and finally passed through a sizing device (11) to be cooled and solidified, and the obtained rain gutter (12) is taken by a take-up machine (13). FIG. 1 shows details of a sizing device (11) used for carrying out the invention of claim 1. Sizing device (11) is lower mold (14)
And the upper mold (15). The lower mold (14) consists of a horizontal outer bottom surface member (16) having a shallow fitting recess in the center, an outer left side surface member (17) whose inner surface is slightly inclined and the outer surface is vertical, and an inner surface which is slightly inclined and outer surface. Is a vertical outer right side member (18).

The upper mold (15) has a relatively thin left wing (19a) and a relatively thick right wing (19b) which are arranged at the upper portion.
, A central hanging part (19c) and a fixing member (19) having a bar (20) inserted and fixed through the vertical hole in the central part and projecting downward from the hanging part (19c), and a flat plate-like block ( (21) and the bottom end hole (22) provided in the upper part is fitted with the lower end of the rod (20) through the coiled compression spring (23). 24) and a flat plate-like block (25) with a substantially inverted L-shaped cross section and a slightly inclined left side surface of its vertical portion.
And the upper part of the right side and the hanging part (19c) of the fixing member (19)
A coiled compression spring (26) is interposed between the upper left part of
The left end of the horizontal portion is sandwiched between the left wing portion (19a) of the fixed member (19) and the outer left side member (17) (2)
7) has a flat plate-like block (28) on the right side surface of the vertical part with a substantially inverted L-shaped cross section, and the upper part of the left side surface and the hanging part (19c) of the fixing member (19). A coiled compression spring (29) is interposed between the upper right part and the right end of the horizontal part of the coiled compression spring (29) sandwiched between the right wing part (19b) of the fixing member (19) and the outer right side member (18). And the inner right side member (30).

The inner bottom surface member (24), the inner left side surface member (27) and the inner right side surface member (30), which are movable in the entire lower mold (14) and the upper mold (15), serve as a cooling water source. There is a waterway (31) in contact. The smooth blocks (21), (25) and (28) are made of stainless steel whose resin flow surfaces are sufficiently polished. Further, in the lower die (14), on the surface facing the plate-like blocks (21) (25) (28), as shown in FIG.
A plurality of parallel slits (32) are formed, and each slit (3
Multiple vacuum suction ports (33) connected to the vacuum device at the back of 2)
Is provided. Width of slit (32) is 2mm, slit
(32) The distance between them is 20 mm. Instead of forming the parallel slits (32), a plurality of vacuum suction holes (34) may be provided as shown in FIG.

Using the above-mentioned sizing device (11), a glass roving (# 4400 manufactured by Nitto Boseki) impregnated with vinyl chloride resin (particle size 100 μ) was used as a fiber-reinforced thermoplastic resin core material (glass. Roving content 30wt
%) (7) and a thin coating layer (35) with a thickness of 0.45 mm each formed by extrusion coating a thermoplastic resin on both sides of the fiber composite gutter (12) with a thickness of 1.2 mm. Simultaneously with vacuum cooling sizing of the outer surface, cooling sizing was performed while pressurizing the inner surface with 0.8 kg / cm ² .

In the above embodiment, the compression springs (23), (26) and (29) are used to apply pressure, but air pressure may be used. Further, although SUS is used as the material of the plate-like blocks (21) (25) (28), other metals may be used, and further, fluorine resin, polyethylene, felt, cloth, etc. may be used.
Further, instead of the plate-shaped blocks (21) (25) (28), rolls (41) (45) (48) as shown in FIG. 5 may be used.
When the molded product has a hollow part such as a pipe, the inner mold corresponding to the lower mold (14) is inserted inside and the outer mold corresponding to the upper mold (15) is covered outside. Be done.

Comparative Example 1 A fiber composite gutter immediately after molding was sized in the same manner as in Example 1 except that an upper mold corresponding to the lower mold of the example was used and vacuum cooling sizing was performed on both upper and lower molds. ..

Embodiment 2 FIG. 6 shows a sizing device (51) used for carrying out the invention of claim 2. The sizing device used in Example 1 (1
Compared to 1), there is no recess in the outer bottom member (56) of the lower mold (54), and the upper mold (55) has a U-shaped cross section in pressure contact with the inner bottom surface, left side surface and right side surface of the molded product. The felt-made pressure body (57) having the flexibility of (1) is connected to the pressure body (5).
It is the same as the sizing device (11) except that 7) is impregnated with water as a cooling liquid. Sizing equipment (11)
The same parts as those in FIG.

It should be noted that an adhesive is generally used for connecting the above-mentioned pressure bodies, but a set screw may be used.

Using the above sizing device (51), Example 1
Similarly to the above, the fiber composite rain gutter immediately after molding was sized.

The surface roughness of the sized fiber composite rain gutters obtained in Examples 1 and 2 and Comparative Example 1 was measured by a surface roughness measuring machine, and the appearance of each was observed.

[0028]

[Table 1] As is clear from the above results, the fiber composite molded article obtained by the present invention has excellent surface smoothness.

[0029]

According to the method for producing a fiber composite molded article of the present invention, good surface smoothness, which cannot be obtained by the conventional sizing method, can be obtained on both sides, and the appearance can be made beautiful.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a sizing device used for implementing the invention of claim 1.

FIG. 2 is a plan view showing a portion having a parallel slit having a lower vacuum suction port.

FIG. 3 is a plan view showing a portion of a lower die having a large number of vacuum suction holes.

FIG. 4 is a schematic side view showing a manufacturing process of a fiber composite rain gutter.

5 is a cross-sectional view showing a modified example of the sizing device of FIG.

FIG. 6 is a cross-sectional view of a sizing device used for carrying out the invention of claim 2.

FIG. 7 is a longitudinal sectional view showing a conventional sizing method when the fiber composite molded article is a pipe.

FIG. 8 is a perspective view of a sizing die used when the fiber composite molded product is a modified product.

FIG. 9 is a side view showing a sizing method when the fiber composite molded article is in the form of a sheet.

[Explanation of symbols]

 (7): Fiber reinforced thermoplastic resin core material (12): Fiber composite material (35): Thin coating layer

Claims (2)

[Claims] 1. A fiber composite material comprising a fiber-reinforced thermoplastic resin core material and a thin coating layer formed by extrusion-coating a thermoplastic resin on both surfaces of the fiber composite material. A method for producing a fiber-composite molded article, which comprises cooling and sizing while applying 0.1 to 5 kg / cm ² . 2. A fiber composite material comprising a fiber-reinforced thermoplastic resin core material and a thin coating layer formed by extrusion-coating thermoplastic resin on both surfaces of the fiber composite material. A method for producing a fiber-composite molded article, comprising sizing while applying pressure with a flexible pressurizing body impregnated with a cooling liquid.