JP3233671B2 - Manufacturing method of fiber composite molded product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a fiber composite molded product.

[0002]

2. Description of the Related Art In a method of producing a molded product by sizing a synthetic resin after extruding it from an extruder, the following sizing methods have been conventionally known, for example.

(A) When the molded article is a pipe, as shown in FIG. 7, a pipe (62) immediately after molding is passed through a closed water tank (61), and a water spraying device (63) is set in the water tank (61). ) By passing pipe
While spraying water on (62), 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). , The front wall of the aquarium (61) (6
1b) by passing through a short horizontal cylindrical portion (66) provided on the inner surface 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) that matches the contour of the deformed product, and the bottom surface of the inner peripheral surface and both lower side surfaces. A sizing in which parallel slits (68) are formed, a vacuum suction port (69) is provided at the back of each slit (68), and a water path (70) connected to a cooling water source is provided. Using the die (71), vacuum suction was performed through the vacuum suction port (69) in the slit (68) while indirectly cooling the molded article immediately after molding.

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

[0006]

When the above-mentioned 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), since there is a variation in cooling inevitably, 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), a smooth surface can be obtained only on the bottom surface and the lower side surfaces of the odd-shaped product. In the case of (c) above,
Since the sheet-shaped molded product is in contact with the cooling surfaces provided alternately on the upper and lower sizing dies and is suctioned alternately by vacuum, the single-sided smooth surface obtained by vacuum suction in the previous stage has: In the next stage, shrinkage occurs because the other surface is evacuated. The same can be said for the other surface once smoothed by vacuum suction. Therefore, the reinforcing fiber pattern of the core material appears on the coating layers on both sides, and there is a problem that a smooth molded product cannot be obtained as a whole.

[0008] 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 product, comprising: a fiber-reinforced thermoplastic resin core material; and a thin-walled coating formed by extrusion-coating a thermoplastic resin on both surfaces thereof. It is characterized in that one side of the fiber composite material comprising the layers is vacuum-cooled and sized at the same time as the other side is cooled and sized while being pressurized at 0.1 to 5 kg / cm ² .

In a second 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 coating layer formed by extrusion-coating a thermoplastic resin on both surfaces thereof. The method is characterized in that one side of the material is vacuum-cooled and sized at the same time that the other side is pressurized with a flexible pressurized body impregnated with a cooling liquid.

According to the first aspect of the present invention, the pressing force is set to 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 according to the second aspect of the present invention include water and oil, and the cooling temperature is preferably up to 80 ° C. Further, specific examples of the flexible pressurizing body include felt, thick cloth, and the like. This pressurized body is of such an extent that one side of the molded article 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.

The core material is made by impregnating a large number of rovings, nonwoven 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 with thermoplastic resin powder such as vinyl chloride resin. The thickness is suitably from 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 product after extrusion coating is preferably 0.5 mm to 3 mm, more preferably 1 to 2 mm.

[0015]

The method for producing a fiber composite molded product according to the present invention has the above-described structure, and therefore, both surfaces of the fiber composite molded product are smooth.

[0016]

【Example】

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

From the unwinding roll (2) on which the sheet-like fiber-reinforced thermoplastic resin core material (1) is wound, the core material (1) is rewound while the heat shaping device (3) is used to rewind the core material (1). Trough-shaped body
(4), and the upper ends of both side walls are gradually wrapped around a pair of right and left cross-section rectangular rod-shaped horizontal cores (5) to form hollow ears (6) to form gutter-shaped cores ( 7)

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

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

The lower die (14) as a whole and the upper die (15), both movable inner bottom member (24), inner left side member (27) and inner right side member (30), are provided with a cooling water source. A communication channel (31) is provided. For the smooth blocks (21), (25), (28), stainless steel whose resin flow surface is sufficiently polished is used. Also, in the lower mold (14), on the surface facing each plate-like block (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. Slit (32) width 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 sizing device (11), a 0.3 mm thick fiber reinforced thermoplastic resin core material (glass / glass) impregnated with vinyl chloride resin (particle diameter 100 μm) in glass roving (# 4400 manufactured by Nitto Boseki). Roving content 30wt
%) (7) and a fiber composite gutter (12) having a thickness of 1.2 mm comprising a thin coating layer (35) having a thickness of 0.45 mm each formed by extrusion-coating a thermoplastic resin on both surfaces. The outer surface was vacuum-cooled and sized at the same time as the inner surface was pressed at 0.8 kg / cm ² .

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

COMPARATIVE EXAMPLE 1 A fiber composite rain gutter immediately after molding was sized in the same manner as in Example 1 except that the upper die used was equivalent to the lower die of the example and vacuum cooling sizing was performed on both upper and lower dies. .

Embodiment 2 FIG. 6 shows a sizing device (51) used for carrying out the second aspect of the present invention. The sizing device (1
Compared with 1), the outer mold member (56) of the lower mold (54) has no concave portion, and the upper mold (55) has a U-shaped cross section where the upper mold (55) is pressed against the inner bottom surface, left side surface and right side surface of the molded product. The pressurized body (57) made of felt having the flexibility of
It is the same as the sizing apparatus (11) except that water is impregnated as a cooling liquid in 7). Sizing device (11)
The same reference numerals are given to the same parts as those described above, and the description thereof is omitted.

It is to be noted that an adhesive is generally used for joining the pressurizing member, but a set screw may be used.

Example 1 using the above sizing device (51)
The sizing of the fiber composite rain gutter immediately after molding was performed in the same manner as described above.

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

[0028]

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

[0029]

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

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a sizing device used for carrying out 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 the lower mold having a plurality of vacuum suction holes.

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

FIG. 5 is a transverse sectional view showing a modification of the sizing device of FIG. 1;

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 a fiber composite molded product is a pipe.

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

FIG. 9 is a side view showing a sizing method when the fiber composite molded product is in a sheet shape.

[Explanation of symbols]

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

Continuation of the front page (56) References JP-A-5-162189 (JP, A) JP-A-51-133357 (JP, A) JP-A-62-48524 (JP, A) JP-A-4-62026 (JP, A) JP-A-3-26521 (JP, A) JP-A-62-92825 (JP, A) JP-A-62-193820 (JP, A) JP-A-53-126069 (JP, A) 59-134528 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 47/00-47/96 B29C 70/06

Claims (2)

(57) [Claims] 1. One side of 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 is vacuum-cooled and sized at the same time as the other surface. Sizing while cooling at a pressure of 0.1 to 5 kg / cm ² . 2. One side of 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 is vacuum-cooled and sized at the same time. Sizing while pressurizing with a flexible pressurized body impregnated with a cooling liquid.