JPH04201543A - Stably shaping method of formed object from fiber reinforced thermoplastic resin sheet - Google Patents

Abstract

PURPOSE:To obtain the formed object of prescribed shape continuously and stably, while the blocking during hot shaping is prevented by a method in which the inward folded part guided always by edge rolls is used as a reference, and the other parts are shaped in order. CONSTITUTION:When the formed object A3 of the prescribed shape which has left and right one or plurality of inward folded parts (a), (b) is shaped from a fiber reinforced thermoplastic resin sheet A1, the sheet A, is folded on the upstream of formed object-shaping zone, thereby forming preliminarily at least a pair of inward folded parts (a), (b). Next while the inward folded parts (a), (b) formed by guiding said sheet to the formed object-shaping zone 5 are respectively guided by the edge rolls 8 of necessary number which are put side by side in advancing direction, prescribed hot shaping is carried out.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a method for stably forming a molded product from a fiber-reinforced thermoplastic resin sheet, for example, a method for stably forming a trough-like body from a fiber-reinforced thermoplastic resin sheet. Regarding how to.

[Conventional technology]

As sheet shaping methods, roll forming, press molding, and thermal shaping in which the sheet is heated and passed through several types of molds in stages are conventionally known.

[Problem to be solved by the invention]

As for sheet forming methods, the above-mentioned method exists for boat fishing, but when forming a gutter-like body from a fiber-reinforced thermoplastic resin sheet, roll forming is used to form the sheet itself. It is impossible to form it because it becomes wrinkled. In addition, press molding cannot be continuously molded, so it is not only inefficient, but also has the disadvantage that post-processing such as extrusion coating cannot be performed. In thermal shaping, the shaping itself is possible, but since a tension difference occurs in the width direction due to the pulling, the object meandering in the width direction, as shown in Fig. 9. During the shaping process, wrinkles (a) may occur in the trough-like body (X), or the inward folds (a) of the ears (B) may not be formed accurately and arc-shaped portions (b) may occur, making it difficult to distinguish between types. There is a problem in that clogging occurs when transferring to a different mold.

An object of the present invention is to provide a method for stably forming a molded article from a fiber-reinforced thermoplastic resin sheet, which solves the above-mentioned problems by improving the above-mentioned thermal forming.

[Means to solve the problem]

The method for stably forming a molded product from a fiber-reinforced thermoplastic resin sheet according to the present invention involves forming a molded product of a predetermined shape having one or more pairs of left and right inward folds from a fiber-reinforced thermoplastic resin sheet. The sheet is folded in front of the product forming zone to form at least one pair of internal folds in advance, and then the sheets are guided to the molded product forming zone so that the formed internal folds are arranged in the direction of travel. It is characterized by performing predetermined heat shaping while being guided by a required number of edge rolls.

In this specification, the term "inwardly folded portion" refers to a bent portion outwardly bent by less than 180° with respect to the molded product to be obtained.

As the reinforcing fibers in the fiber-reinforced thermoplastic resin sheet, all continuous fibers that can be used for reinforcing the thermoplastic resin are used. Specifically, these include inorganic fibers such as glass fiber, carbon fiber, silicon/titanium/carbon fiber, boron fiber, and fine metal fiber, and organic fiber such as aramid fiber, vinylon fiber, econor fiber, polyester fiber, and polyamide fiber. .

The continuous reinforcing fibers used are roving-like or strand-like continuous filaments having a diameter of 1 to several tens of micrometers.

In addition, continuous reinforcing fibers are arranged in the longitudinal direction of the sheet,
In addition to this, continuous reinforcing fibers, cross-like fibrous materials, net-like fibrous materials, or nonwoven fabrics that are perpendicular to or intersecting with the continuous reinforcing fibers arranged in the longitudinal direction may be arranged as necessary.

The thermoplastic resin in the sheet is not particularly limited as long as it can be heat-formed, but specifically, olefin polymers such as polyethylene and polypropylene,
These include vinyl chloride and its copolymers, acrylic resins and its copolymers, engineering plastics such as polyphenylene sulfide and polyether sulfone.

[For production]

The method for stably forming a molded product from a fiber-reinforced thermoplastic resin sheet according to the present invention involves forming a molded product of a predetermined shape having one or more pairs of left and right inward folds from a fiber-reinforced thermoplastic resin sheet. The sheet is folded in front of the product forming zone to form at least one pair of internal folds in advance, and then the sheets are guided to the molded product forming zone so that the formed internal folds are arranged in the direction of travel. Since the predetermined heat shaping is performed while being guided by a required number of edge rolls, other parts are sequentially shaped using the inward folded part guided by the edge rolls as a reference.

〔Example〕

First, an apparatus used in an embodiment of the present invention will be explained with reference to the drawings. In the following description, "front" refers to the right direction in FIG.

Further, in this example, a gutter-like body is obtained as a molded article.

In Figures 1 to 7, (1) is a feeding machine that feeds out a fiber-reinforced resin sheet (A1), (2) is a feeding machine that feeds out a fiber-reinforced resin sheet (A1), and (2) is made up of three rolls (2a) (2b) (2c) arranged in parallel. Only the roll (2b) can move left and right and the sheet (A1)
(3) is an inward fold forming zone that forms a pair of inward folds in the sheet (A1); (4) is arranged behind the inward fold forming zone (3); Specifically, a hot air fan or a heater is used. (5) is a molded product forming zone that thermally shapes the inner folded sheet into a trough-like body that is a molded product, and (6) is a cooling means placed behind the molded product forming zone (5). Generally, a cooling fan is used. (7) is a take-off machine that takes over the channel-like body (AC) formed into a predetermined shape in the molded product forming zone (5).

Next, a method for forming a trough-like body from a fiber-reinforced thermoplastic resin sheet using the above-mentioned apparatus will be explained.

Fiber-reinforced thermoplastic resin sheet used in this example (
Al) was obtained as follows.

That is, 20 glass rovings are lined up and introduced into a fluidized bed, and while being opened there, a pressure of 2°5Kg/Cl12 is applied.
The vinyl chloride resin blended powder in a floating state blown up by the air is attached to it, passed through a heating furnace to heat the vinyl chloride resin blended powder to 190°C, and then the surface temperature is increased to 2.
It is completely melted by passing it through a pair of heated pinch rolls at 00℃ and being heated to a thickness of 0.6cm and a width of 400mm.
I11 Sheet with glass roving content of 30% by volume (S
l) was obtained.

This sheet (81) is fed out from the feeding machine (1), passed through the roll guider (2), heated to 80°C by the heating means (4), and then guided to the inward fold forming zone (3). Form a pair of left and right inward folds (a) and (b) (
Figure 2).

Next, the sheet with the inner fold (A2) is cooled with cold air at room temperature by the cold air means (6), and then the molded product forming zone (5) is cooled.
90°C warm air is applied while guiding the formed inner folds (A) and (B) with five edge rolls (8) arranged in the direction of travel. The trough-like body (A3) is heat-shaped (FIGS. 3 to 7).

Up to the inner fold formation zone (3), the meandering occurs in a sheet-like manner, so it is controlled by the roll guider (2) and the inner fold formation zone (3) is controlled by the roll guider (2).
(a) (b) After formation, the meandering occurs in a three-dimensional shape, so it is controlled by the edge roll (8). Therefore, a gutter-like body (A3) having a predetermined shape as shown in FIG. 8 could be obtained without causing clogging phenomenon as in the conventional method during heat forming. This gutter-like body (A3) is used as a core material, and a thermoplastic resin is coated on the inside and outside using a coating die to manufacture a gutter.

In addition, the edge roll (8) shown in FIG. 3(a) is
An edge roll (8°) as shown in Figure (b) or an edge roll (8') as shown in Figure 3(e).
) is also fine.

In addition, in this example, the ears (B) (C
Since a pair of inward folds (a) and (b) are required at the downward end of )(B)
However, depending on the shape of the ear, there may be multiple pairs of inward folds. Molded products are not limited to gutter-like bodies, so the same can be said for some molded products. In such a case, a plurality of pairs of inward folds may be formed in advance before the molded product shaping zone.

〔Effect of the invention〕

According to the method of stably shaping a fiber-reinforced thermoplastic resin sheet of the present invention, other parts are sequentially shaped using the inward folded part that is always guided by the edge roll as a reference, so that thermal shaping Molded products of a predetermined shape can be stably and continuously obtained without clogging during cutting.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the apparatus used for carrying out this invention;
Figure 2 is an enlarged sectional view taken along the line ■-■ in Figure 1, and Figure 3 (
a) is an enlarged sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 (b)
) and FIG. 3(c) are sectional views showing modified examples of the edge roll shown in FIG. 3(a), respectively, and FIG.
5 is an enlarged sectional view taken along the line V-■ of FIG. 1, FIG. 6 is an enlarged sectional view taken along the line Vl-Vl of FIG. 1, and FIG. 1 is an enlarged sectional view taken along the line ■-■, FIG. 8 is a partial perspective view of the trough-like body after forming, and FIG. 9 is a front view showing problems when forming the conventional trough-like body. . (A1)...Fiber reinforced thermoplastic resin sheet, (A3)
... Molded product (trough-shaped body), (a) (b)... Inward folding part, (5)... Molded product shaping zone, (8)... Edge roll. Patent applicant: Sekisui Chemical Co., Ltd. Figure 5 A7 Figure 6 Figure 7

Claims (1)

[Claims] When shaping a fiber-reinforced thermoplastic resin sheet (A1) into a molded product (A3) of a predetermined shape having one or more pairs of left and right inward folds (a) and (b), a molded product shaping zone (5) is formed. The sheet (A1) is folded beforehand to form at least a pair of inward folds (a) and (b), and then these are guided to the molded product forming zone (5) to form the inward folds. Stabilization of molded products from fiber-reinforced thermoplastic resin sheets characterized by performing predetermined thermal shaping while guiding (a) and (b) with a required number of edge rolls (8) arranged in the direction of travel. form method.