JPH0497828A - Manufacturing method and equipment for synthetic resin molded products - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A6 Object of the Invention (1) Industrial Field of Application The present invention relates to a method for manufacturing a synthetic resin molded article, and in particular, to a method for manufacturing a synthetic resin molded product, in particular a method for manufacturing a molding sheet by applying a molding sheet to the molding surface of a mold having convex portions and concave portions. The present invention relates to a method of manufacturing a molded product by pressure bonding and a manufacturing device used to carry out the method.

(2) Conventional technology Conventionally, as a manufacturing method for synthetic resin molded products, in order to suppress uneven thickness of the molded product, the molding sheet is stretched and inflated before being crimped onto the molding surface. A method is known that employs a pretensioning means such as (see, for example, Japanese Patent Publication No. 48-40071).

(3) Problems to be Solved by the Invention However, in the conventional method, the molding surface of the mold only has a simple convex shape. Even if uniformity can be suppressed, if the molding surface has a complicated appearance, such as having convex portions and concave portions, the above-mentioned pre-tensioning means cannot provide satisfactory results.

In view of the foregoing, the present invention provides a synthetic resin molded article by employing at least two pre-stretching means when obtaining a synthetic resin molded product from a molding sheet using a molding die having a molding surface with convex portions and concave portions. It is an object of the present invention to provide the above-mentioned manufacturing method and manufacturing apparatus that can suppress non-uniformity in the thickness of a resin molded product.

B9 Structure of the Invention (1) Means for Solving the Problems In the method for manufacturing a synthetic resin molded product according to the present invention, a molding sheet is disposed facing the molding surface of a mold having convex portions and concave portions. a step of firstly pretensioning the forming sheet so that it bulges toward the forming surface; and releasing the primary pretension as the forming sheet approaches the forming surface. a step of secondarily pre-stretching the forming sheet so that it is placed over the convex portion and pushed into the recess; and press-bonding the forming sheet to the forming surface to form an intermediate body. The method is characterized in that the step of curing the intermediate and the step of curing the intermediate are sequentially performed.

The method for manufacturing a synthetic resin molded product according to the present invention also includes a step of arranging a molding sheet to face the molding surface of a mold having convex portions and concave portions, and A step of primary pre-stretching so as to bulge toward the surface;
The primary pretension is released, and the forming sheet is subjected to a secondary process so that it is deformed into a cross-sectional waveform consisting of a concave portion facing the convex portion of the molding surface and a convex portion opposing the concave portion of the molding surface. a pre-stretching step, a step of covering the concave portion over the convex portion of the molding surface and arranging the convex portion within the concave portion of the molding surface, and pressing the molding sheet onto the molding surface to form an intermediate body. The method is characterized in that the step of molding and the step of curing the intermediate are performed sequentially.

Furthermore, the method for producing a synthetic resin molded article according to the present invention includes a step of arranging a molding sheet to face a molding surface of a mold having convex portions and concave portions; A step of primary pretensioning so as to bulge toward the surface, and releasing the primary pretension as the forming sheet and the forming surface approach each other, and then stretching the forming sheet so that it bulges toward the convex portion. a step of secondly pre-stretching the forming sheet so as to cover it and being pushed into the concave portion; a step of tertiary pre-stretching the forming sheet so as to separate it from the convex portion; and the third pre-stretching step. After the release, the molding sheet is pressed against the molding surface to mold an intermediate body, and the intermediate body is hardened, which are sequentially performed.

The apparatus for manufacturing a synthetic resin molded product according to the present invention includes a pretensioning member on one side of a molding sheet, a mold on the other side, a non-molding position where they are separated from the molding sheet, and a non-molding position where they are separated from the molding sheet. and a molding position close to the molding sheet so as to sandwich the edge of the molding sheet, and the mold has a molding surface having a convex part and a concave part, The member includes at least one of a movable plug and a compressed air source that expands the forming sheet toward the forming surface when the member is in the forming position and the forming mold is in the non-forming position. a secondary pretensioning means consisting of a pretensioning means and a fixing plug that covers the convex part of the molding surface with the molding sheet and pushes it into the concave part when the pretensioning member and the mold are both in the molding position; The molding apparatus is characterized in that it includes an air pressure source that presses the molding sheet after secondary prestretching onto the molding surface.

Furthermore, the apparatus for manufacturing synthetic resin molded products according to the present invention includes a pretension member on one side of the molding sheet, a mold on the other side,
a non-forming position where they are spaced apart from the forming sheet;
The molding die has a molding surface having a convex portion and a concave portion, and the molding die has a molding surface having a convex portion and a concave portion, and the molding die has a molding surface having a convex portion and a concave portion. The pre-tensioning member includes at least one of a movable plug that expands the forming sheet toward the forming surface when the member is in the forming position and the forming die is in the non-forming position, and a compressed air source. 2 consisting of a primary pre-stretching means, a vacuum source and a fixing plug for deforming the forming sheet into a cross-sectional waveform consisting of a concave portion facing the convex portion of the molding surface and a convex portion facing the concave portion of the molding surface; and a pre-tensioning means;
The method is characterized in that it includes an air pressure source that presses the molding sheet after pre-stretching onto the molding surface.

Furthermore, the apparatus for manufacturing a synthetic resin molded product according to the present invention includes a pretensioning member on one side of a molding sheet, a mold on the other side, and a non-molding position where they are spaced apart from the molding sheet; In order to sandwich the edges of the molding sheet, the molding molds have a molding surface having a convex portion and a concave portion, and the molding die has a molding surface having a convex portion and a concave portion, and The tension member includes at least one of a movable plug and a compressed air source that expands the molding sheet toward the molding surface when the tension member is in the molding position and the mold is in the non-molding position. A secondary pre-stretching means comprising a fixed plug that covers the convex portion of the molding surface with the molding sheet and pushes it into the recess when the pre-stretching member and the mold are both in the molding position. and a tertiary pre-stretching means comprising a compressed air source for separating the molding sheet from the convex portion of the molding surface is provided in the mold, and the molding sheet after tertiary pre-stretching is placed on the molding surface. It is characterized by being equipped with an air pressure source for crimping.

The air pressure source is at least one of a vacuum source and a compressed air source.

(2) Effect According to the above-mentioned manufacturing method, by employing two or three pre-stretching steps, it is possible to manufacture a synthetic resin molded product in which unevenness in wall thickness is suppressed as much as possible. .

According to the manufacturing apparatus, it is possible to reliably implement the method.

(3) Example Figure 1 shows an example of a fiber-reinforced synthetic resin molded product 1, which includes a box-shaped main body 2 and a flange portion 3 provided on the entire outer periphery of the opening of the main body 2. and has. Main body 2
The center portion of the bottom wall 4 is provided with a hollow convex portion 6 whose tip side protrudes outward beyond the opening 5. The molded product 1 is a laminate and is composed of an inner fiber reinforced layer 7 and an outer surface layer 8.

FIG. 2 shows a molding sheet 9 used to obtain the molded article 1, the molding sheet 9 having an upper flexible film 10. and the lower visibility film 10, the upper flexible film 10. An uncured base material layer 11 located on the side, and a synthetic resin liquid layer 12 located on the lower flexible film 10 □ side.
It is provided by overlapping these.

The upper and lower flexible films ion and tow are made of vinylon, function as supports for the uncured base material layer 11 and the synthetic resin liquid layer 12, and are peeled off from the molded product 1 after molding.

The uncured base material layer 11 is composed of a reinforcing fiber aggregate and a synthetic resin liquid impregnated into the aggregate.

Glass fiber is used as the reinforcing fiber, and unsaturated polyester resin liquid is used as the synthetic resin liquid.

The synthetic resin liquid layer 12 is cured during the curing process of the uncured base material layer 11 to form the surface layer 8 of the molded article 1, and contains unsaturated polyester resin as a main component, and contains pigments, crosslinking agents,
It is prepared by adding a curing catalyst, etc.

Next, an example of manufacturing the molding sheet 9 will be described.

Product name: Borac N-325) Silicic acid anhydride powder: 2 parts by weight Titanium dioxide pigment: 10 parts by weight Styrene (crosslinking agent)
15 parts by weight were put into a homomixer and mixed to obtain a mixed solution. Next, 2 parts by weight of MgO and 11 parts by weight of t-butyl perbenzoate (curing catalyst) were added to 100 parts by weight of the mixed solution to prepare a synthetic resin liquid.

This synthetic resin liquid was applied to a lower flexible film 10. of vinylon having a thickness of 50 μm. Apply 1 to 2 coats on the top surface,
Next, the coating layer was subjected to a thickening treatment at 40° C. for 1 day to form a synthetic resin liquid layer 12.

1 part by weight of t-butyl perbenzoate was added to 100 parts by weight of an unsaturated polyester resin (manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd., trade name: Polak G-105) to form an uncured base material.
A synthetic resin liquid for 1 was prepared.

In addition, three pieces of glass fiber cloth (manufactured by Nittobo Co., Ltd., product name C-45
0A) were overlapped to produce a reinforcing fiber aggregate. This aggregate impregnated with the synthetic resin liquid is laminated on the upper surface of the synthetic resin liquid layer 12 to form an uncured base material layer 11 with a thickness of 2 to 3 m, and then vinylon is applied to the upper surface of the layer 11. 10. The upper flexible film has a thickness of 50 μm. were laminated, and then the laminate was subjected to defoaming treatment to obtain a molding sheet 9 having a thickness of about 4 mm.

3a to 3e show an example of a method for manufacturing the molded article 1 and a manufacturing apparatus used in the method.

In FIG. 3a, a clamper 14 for gripping the peripheral edge of the forming sheet 9 is provided at an intermediate portion in the vertical direction of the supporting columns 13 facing each other. The clamper 14 consists of a lower fixed plate 15 fixed to the column 13 and an upper movable plate 17 that is raised and lowered by an operating cylinder 16.

A pretension member 18 is provided on one side of the forming sheet 9, in the illustrated example above the forming sheet 9, and on the other side of the forming sheet 9,
In the illustrated example, molds 19 are arranged below the molding sheet 9, and the pretensioning member 18 and the molding mold 19 are arranged at a non-molding position spaced apart from the molding sheet 9 and at an edge of the molding sheet 9. A molding position close to the molding sheet 9 can be occupied in order to clamp the molding material via the clamper 14.

The molding surface 20 of the mold 19 has a recess 21 that opens upward.
Ill! is provided at the center of the bottom surface of the recess 21 and the tip side protrudes above the opening of the recess 21! 4822. The main body 2 of the molded product 1 is formed using the recess 2I, and the hollow protrusion 6 is formed using the protrusion 22. The flange portion 3 is formed by a clamper 14. Vent holes 23 are opened at the bottom surface of the recess 21 and the top surface of the convex portion 22, and these vent holes 23 are connected to a vacuum source vl. The mold 19 is raised and lowered by the operating cylinder 24, and can reciprocate between a molding position after being raised and a non-molding position after being lowered.

The pretension member 18 has a box 25 that opens downward, and a movable plug 26 and a plurality of fixed plugs 27 surrounding the movable plug 26 are disposed within the box 25. The movable plug 26 is expanded and contracted by an operating cylinder 28, and its lower end face faces the top face of the convex portion 22 of the mold 19. The lower end surface of each fixing plug 27 faces the bottom surface of the recess 21 . A ventilation hole 29 is opened in the ceiling surface of the box body 25.
is connected to the compressed air source P1. The box body 25 is the operating cylinder 3
0, and can reciprocate between the non-forming position after being raised and the forming position after being lowered.

The movable plug 26 moves the forming sheet 9 when the pretensioning member 18 is in the forming position and the forming mold 19 is in the non-forming position.
It has the function of bulging out toward the molding surface 20, and corresponds to the primary pre-stretching means.

Further, each fixing plug 27 is connected to the pretension member 18 and the mold 1.
When both the molding sheets 9 are at the molding position, the molding sheet 9 has the function of covering the convex portion 22 of the molding surface 20 and pushing it into the recess 21, and corresponds to a secondary pre-tensioning means.

Further, the vacuum source 1 and the compressed air source P1 are connected to the forming sheet 9
This constitutes an air pressure source that presses the molding surface 20 onto the molding surface 20.

In manufacturing the molded product 1, the following steps are performed in sequence.

b) As shown in Figure 3a, raise the pretensioning member 18 and lower the mold 19 to keep them in the non-forming position. The mold 19 is heated to approximately 120°C.

The peripheral edge of the molding sheet 9 with the lower flexible film 10z positioned below is held by the clamper 14, and the sheet 9 is placed above the molding surface 20.

(11) As shown in Figure 3b, a pair of heaters 31
are disposed close to the upper and lower surfaces of the molding sheet 9, respectively, and after the molding sheet 9 is heated to 60°C to soften it, each heater 31 is removed from the upper and lower surfaces of the molding sheet 9. .

(iii) Lower the pretensioning member 18 and keep it in the forming position, as shown in Figure 3c. At this molding position, the box body 25
The lower end surface of the clamper 14 is in close contact with the upper surface of the movable plate 17 to form a seal between them. Further, the movable plug 26 is in an extended state, and the molding sheet 9 is expanded toward the molding surface 20 by the movable plug 26 . As a result, the entire molding sheet 9 is stretched approximately uniformly, and thus the molding sheet 9 is primarily pre-stretched.

(iv) As shown in Figure 3d, the mold 19 is raised and kept in the molding position. In this molding position, mold 1
The peripheral edge of the molding surface 20 of the clamper 14 is brought into close contact with the lower surface of the fixed plate 15 of the clamper 14 to form a seal between them.

Further, as the molding sheet 9 and the molding surface 20 approach each other, the movable plug 26 contracts so as not to hit the top surface of the convex portion 22.
Next pretension is released.

When the top surface of the convex part 22 of the mold 19 passes the lower end face of each fixing plug 27, the molding sheet 9 is pushed up by the convex part 22, and around the convex part 22, the pushing up of the molding sheet 9 is This is blocked by the fixing plug 27. As a result, the molding sheet 9 is placed over the convex portion 22 by each fixing plug 27 and is pushed into the concave portion 21, so that the molding sheet 9 is approximately evenly distributed in correspondence with the convex portion 22 and the concave portion 21. -, therefore the forming sheet 9 is stretched to 2
Next pretensioned.

(V) As shown in FIG. 3e, both the compressed air #P1 and the vacuum source #1 are operated to press the molding sheet 9 after secondary prestretching to the molding surface 20 to mold the intermediate body 10, Next, the intermediate body 10 is heated and hardened in the pressed state to form the molded product 1.
get.

By employing the pre-stretching means twice in this way, it is possible to obtain a molded product 1 in which non-uniformity of the wall thickness is suppressed to the utmost.

In the molded product 1 using the molding sheet 9 having a thickness of approximately 411 mm as described above, the thickness of the ridge portions 1a is 3 to 4 mm, and the thickness of the valley portions 1b is 4 to 5 mm. It can be seen that the wall thickness is made uniform.

FIG. 4 shows another example in which the forming sheet 9 is primarily pre-stretched by pressurized air from the compressed air source P1 instead of the movable plug 26, and corresponds to FIG. 3C.

Even if such a means is used, the same effect as described above can be obtained.

Figures 5a to 5f show another example of a method for manufacturing the molded article 1 and a manufacturing apparatus used in the method.

In FIG. 5a, the vent hole 29 of the pretension member 18 is selectively connected to the vacuum source 2 and the compressed air source P via the switching valve 32. Other structures in the device are the third
Since it is the same as the example shown in FIG. a, the same components are given the same reference numerals and detailed explanations will be omitted.

In manufacturing the molded product 1, the following steps are performed in sequence.

(1) As shown in Figure 5a, raise the pretension member 18 and lower the mold 19 to keep them in the non-molding position. The mold 19 is heated to approximately 120°C.

The peripheral edge of the molding sheet 9 with the lower flexible film 10t positioned below is held by the clamper 14, and the sheet 9 is placed above the molding surface 20.

(ii) As shown in FIG. 5b, a pair of heaters 31
are placed close to the upper and lower surfaces of the molding sheet 9, respectively, and after the molding sheet 9 is heated to 60°C to soften it, each heater 31 is removed from the upper and lower surfaces of the molding sheet 9. .

(ij) As shown in Figure 5c, lower the pretensioning member 18 and keep it in the forming position. At this molding position, the lower end surface of the box 25 comes into close contact with the upper surface of the movable plate 17 of the clamper 14, creating a seal between them. Further, the movable plug 26 is in an extended state, and the molding sheet 9 is expanded toward the molding surface 20 by the movable plug 26 . As a result, the entire molding sheet 9 is stretched approximately uniformly, and thus the molding sheet 9 is primarily pre-stretched.

(iv) As shown in FIG. 5d, the movable plug 26 is contracted to keep its lower end surface above the lower end surface of each fixed plug 27, and the primary pretension is released.

The vacuum source (2) of the 18 pretension members is activated to reduce the pressure inside the box body 25 via the switching valve 32. As a result, the molding sheet 9 bulges upward between both adjacent fixing plugs 27, so that the molding sheet 9 has a downward recess (recess) 9a facing the convex portion 22 of the molding surface 20 and a molding sheet 9. The forming sheet 9 is stretched almost uniformly so as to be deformed into a cross-sectional waveform consisting of the downward convex portions (convex portions) 9b facing the concave portions 21 of the surface 20, and thus the forming sheet 9 is subjected to secondary pretension.

(v) Raise the mold 19 and keep it in the molding position, as shown in Figure 5e. At this molding position, the peripheral edge of the molding surface 20 of the mold 19 comes into close contact with the lower surface of the fixed plate 15 of the clamper 14, creating a seal between them. Also, the molding sheet 9
The downward concave portion 9 a is placed over the convex portion 22 of the molding surface 20 , and the downward convex portion 9 b is disposed within the concave portion 21 of the molding surface 20 .

(vi) As shown in FIG. 5f, the compressed air source P on the pretension member 18 side is operated to supply pressurized air into the box body 25 through the switching valve 32, and the vacuum source P on the mold 19 side is operated. 1 is activated to reduce the pressure between the molding surface 2o and the molding sheet 9, thereby pressing the molding sheet 9 onto the molding surface 20 and molding the intermediate body 10. In this pressed state, the intermediate body 10 is heated and cured to obtain a molded product 1.

As mentioned above, the thickness is about 41cm! In the molded product 1 using the molding sheet 9 of III+, the thickness of the chevron portion 1a is 3.5~
4 mm, and the thickness of the valley portion 1b is 4' to 4.5 mm, indicating that the thickness is made uniform.

6a to 6f show the method for manufacturing the molded article 1 and the other side of the manufacturing apparatus used in the method.

In FIG. 6a, the ventilation hole 23 of the mold 19 is connected to the switching valve 3.
3, it is selectively connected to the vacuum source 1 and the compressed air source P2. Other structures in the device are 3a.
Since it is the same as the illustrated example, the same components are given the same reference numerals and detailed explanations will be omitted.

In manufacturing the molded product 1, the following steps are performed in sequence.

(i) Raise the pretensioning member 18 and lower the mold 19 to keep them in the non-molding position, as shown in Figure 6a. The mold 19 is heated to approximately 120''C.

The peripheral edge of the molding sheet 9 with the lower flexible film IO□ positioned below is held by the clamper 14, and the sheet 9 is placed above the molding surface 20.

(11) As shown in Fig. 6b, a pair of heaters 31
are disposed close to the upper and lower surfaces of the molding sheet 9, respectively, and after heating the molding sheet 9 to 6o''C to soften it, each heater 31 is removed from the upper and lower surfaces of the molding sheet 9. .

(iii) As shown in FIG. 6c, the pretension member 18
lower and keep it in the molding position. At this molding position, the box body 2
The lower end surface of the clamper 14 is in close contact with the upper surface of the movable plate 17 of the clamper 14 to form a seal between them. Further, the movable plug 26 is in an extended state, and the movable plug 26 causes the molding sheet 9 to
is expanded toward the molding surface 2o. As a result, the entire molding sheet 9 is stretched approximately uniformly, and thus the molding sheet 9 is primarily pre-stretched.

(iv) As shown in Figure 6d, the mold 19 is raised and kept in the molding position. In this molding position, the mold 19
The peripheral edge of the molding surface 20 of the clamper 14 is brought into close contact with the lower surface of the fixed plate 15 of the clamper 14 to form a seal between them.

Further, as the molding sheet 9 and the molding surface 20 approach each other, the movable plug 26 contracts so as not to hit the top surface of the convex portion 22.
Next pretension is released.

When the top surface of the convex part 22 of the mold 19 passes the lower end face of each fixing plug 27, the molding sheet 9 is pushed up by the convex part 22, and around the convex part 22, the pushing up of the molding sheet 9 is This is prevented by the fixing plug 27. As a result, the molding sheet 9 is placed over the convex portion 22 by each fixing plug 27 and is pushed into the concave portion 21, so that the molding sheet 9 is approximately evenly distributed in correspondence with the convex portion 22 and the concave portion 21. -, therefore the forming sheet 9 is stretched to 2
Next pretensioned.

(v) As shown in FIG. 6e, the compressed air source P2 on the mold 19 side is operated to supply pressurized air between the molding sheet 9 and the molding surface 20 via the switching valve 33. As a result, the forming sheet 9 is stretched approximately evenly so as to be spaced apart from the convex portion 22 of the forming surface 20, and thus the forming sheet 9 is tertiary pre-stretched.

(vi) As shown in Fig. 6f, operate the compressed air source P1 on the pretension member 18 side to supply pressurized air into the box body 25, and also operate the vacuum source (2) on the mold 19 side. Switching valve 3
3 to reduce the pressure between the molding surface 20 and the molding sheet 9,
As a result, the molding sheet 9 is pressed onto the molding surface 20, and the intermediate body 10 is molded.

In the pressed state, the intermediate body 10 is heated and hardened to form a molded product 1.
get.

In the molded product 1 using the molding sheet 9 having a thickness of approximately 4 mm as described above, the thickness of the mountain portions 1a is 3.5 to 4, and the thickness of the valley portions 1b is 4 to 4. .50, and it can be seen that the wall thickness is made uniform.

C0 Effects of the Invention According to the manufacturing method of the present invention, the forming sheet is pre-stretched two or three times before being crimped onto the forming surface. It is possible to obtain a synthetic resin molded product in which non-uniformity in wall thickness is suppressed to the utmost.

According to the manufacturing apparatus of the present invention, the method described above can be carried out reliably.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a synthetic resin molded product, Figure 2 is a cross-sectional view of a molding sheet, Figures 3a to 3e are illustrations of the first molded product manufacturing method, and Figure 4 is a second molded product manufacturing method. Explanatory diagram of one step in the method, Figures 5a to 5f, 6a to 6f circles are the third
．． FIG. 4 is an explanatory diagram of a fourth molded product manufacturing method. P+, Pt...pressure air source, V,,V,...vacuum source, 1
... Synthetic resin molded product, 10 ... Intermediate, 9 ... Molding sheet, 9a ... Downward recess (recess), 9b ...
・Downward convex part (convex part), 10. ．． 10. ... Upper and lower flexible films, ]1... Uncured base material layer, 12...
Synthetic resin liquid layer, 1st... Pretension member, 19... Molding die, 20... Molding surface, 21... Concave portion, 22... Convex portion, 26... Movable plug, 27...・Fixed plug

Claims (6)

[Claims] (1) Place the molding sheet (9) into the convex portions (22) and concave portions (
21) of a molding die (19) facing the molding surface (20), and arranging the molding sheet (9) so that it bulges toward the molding surface (20). A step of first pre-tensioning the forming sheet (9) and the forming surface (
20), the primary pretension is released and the forming sheet (9) is placed over the convex part (22) and pushed into the concave part (21). Next, a pre-stretching step and the forming sheet (9) are applied to the forming surface (2).
1. A method for manufacturing a synthetic resin molded article, characterized in that a step of molding an intermediate body (1_0) by pressure-bonding the intermediate body (1_0) and a step of curing the intermediate body (1_0) are sequentially performed. (2) Forming sheet (9) into convex portions (22) and concave portions (
21) of a molding die (19) facing the molding surface (20), and arranging the molding sheet (9) so that it bulges toward the molding surface (20). a step of first pre-stretching, and releasing the primary pre-stretching, and then inserting the forming sheet (9) into the concave portion (9a) opposite to the convex portion (22) of the forming surface (20) and the forming sheet (9). The recess (2) on the molding surface (20)
1) a step of secondary pre-stretching so as to deform into a cross-sectional waveform consisting of a convex portion (9b) facing the above-mentioned convex portion (9b); A step of arranging the convex portion (9b) in the recess (21) of the molding surface (20), and placing the molding sheet (9) on the molding surface (20).
20) to form an intermediate body (1_0);
A method for manufacturing a synthetic resin molded article, characterized in that the step of curing the intermediate (1_0) is performed sequentially. (3) Forming sheet (9) into convex portions (22) and concave portions (
21) of a molding die (19) facing the molding surface (20), and arranging the molding sheet (9) so that it bulges toward the molding surface (20). A step of first pre-tensioning the forming sheet (9) and the forming surface (
20), the primary pretension is released and the forming sheet (9) is placed over the convex part (22) and pushed into the concave part (21). a second pre-stretching step, a third pre-stretching step of the forming sheet (9) so as to separate it from the convex portion (22), and a step of third pre-stretching the forming sheet (9) after the third pre-stretching is released. ) to the molding surface (20) to mold an intermediate body (1_0), and a process of curing the intermediate body (1_0), which are performed in sequence. (4) Pretension member (18) on one side of the forming sheet (9)
and a mold (19) on the other side, a non-molding position where they are separated from the molding sheet (9), and a molding mold (19) in order to sandwich the edge of the molding sheet (9). Sheet (
9), and the mold (19) has a convex portion (22) and a concave portion (21).
and a forming surface (20) having said pretensioned member (18).
is a movable member that expands the forming sheet (9) toward the forming surface (20) when the member (18) is in the forming position and the forming die (19) is in the non-forming position. When the primary pretensioning means consisting of at least one of the plug (26) and the compressed air source (P_1), the pretensioning member (18) and the mold (19) are both in the molding position, the molding sheet (9 ) is placed over the convex portion (22) of the molding surface (20) and is pushed into the concave portion (21) (27).
A synthetic resin molded article, characterized in that it has a secondary pre-stretching means consisting of: Manufacturing equipment. (5) Pretension member (18) on one side of the forming sheet (9)
and a mold (19) on the other side, a non-molding position where they are separated from the molding sheet (9), and a molding mold (19) in order to sandwich the edge of the molding sheet (9). Sheet (
9), and the mold (19) has a convex portion (22) and a concave portion (21).
and a forming surface (20) having said pretensioned member (18).
is a movable member that expands the forming sheet (9) toward the forming surface (20) when the member (18) is in the forming position and the forming die (19) is in the non-forming position. A primary pretensioning means consisting of at least one of a plug (26) and a compressed air source (P_1), and a recess (9a) opposing the convex part (22) of the molding surface (20) to hold the molding sheet (9).
) and a convex portion (9b) facing the concave portion (21) of the molding surface (20).
_2) and a secondary pretensioning means consisting of a fixing plug (27), and an air pressure source for compressing the forming sheet (9) after the secondary pretensioning to the forming surface (20). Features: Manufacturing equipment for synthetic resin molded products. (6) Pretension member (18) on one side of the forming sheet (9)
and a mold (19) on the other side, a non-molding position where they are separated from the molding sheet (9), and a molding mold (19) in order to sandwich the edge of the molding sheet (9). Sheet (
9), and the mold (19) has a convex portion (22) and a concave portion (21).
and a forming surface (20) having said pretensioned member (18).
is a movable member that expands the forming sheet (9) toward the forming surface (20) when the member (18) is in the forming position and the forming die (19) is in the non-forming position. When the primary pretensioning means consisting of at least one of the plug (26) and the compressed air source (P_1), the pretensioning member (18) and the mold (19) are both in the molding position, the molding sheet (9 ) is placed over the convex portion (22) of the molding surface (20) and is pushed into the concave portion (21) (27).
The molding die (19) is provided with a secondary pre-tensioning means consisting of a convex portion (20) of the molding surface (20).
22) is provided with a tertiary pre-stretching means consisting of a compressed air source (P_2) separated from the air pressure source (P_2), and an air pressure source is provided to press the molding sheet (9) after the tertiary pre-stretching to the molding surface (20). Features: Manufacturing equipment for synthetic resin molded products.