JP2000052352A - Manufacture of molding and molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a coating layer on molding by applying a coating agent in such a state that the agent is exposed on the pictorial face of a molding die and then bringing a molding blank into contact with a mold face an further applying the coating agent to the molding blank. SOLUTION: The halves of a mold 13 are separated from each other to open a molding space part 14 and sprays 17 are introduced into the space part 14 and further a coating agent 5 is applied to a mold face 15 by the sprays 17. Next the sprays 17 are detached and an opening part fixture 19 which holds a bottomed cylindrical parison 1 is introduced into the mold 13. Further the halves of the mold 13 are brought into contact with each other to close the molding space part 14. Thus the parison 1 is gripped and fixed by the opening part fixture 19 and the recessed part 13a of the mold 13. The parison 1 fixed by the opening part 1a is stretched along the longitudinal axis using an ejector rod 2 to eject the bottom part 1b of the parison 1. Consequently the parison 1 is brought into contact with the bottom part of the mold 13 and a fluid such as air is forced into the molding blank 1 by the opening fixture 19 to inflate the parison 1 and the outer face of the molding blank 1 is brought into contact with the mold face 15.

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 molded article and a molded article, and is suitable for, for example, a synthetic resin molded article having a hardened surface.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a synthetic resin molded article having a cured surface on its surface, a method of applying a coating agent to the surface of a molded article separated from a mold and curing the coating agent has been known. is there. Specifically, after a parison (molding material) made of a thermoplastic synthetic resin is blow-molded (molding step), a liquid coating agent is applied to the surface of the molded article separated from the mold by spraying, dipping, or the like. The coating agent is cured by UV irradiation, heating and drying to form a cured surface. Such a manufacturing method has an advantage that a cured surface can be formed on the surface even of a molded article having a complicated shape.

[0003]

However, in the above-mentioned manufacturing method, a coating agent is applied to a molded product after the molding process is completed. Due to problems such as measures against the adhesion of water, there is a problem that the manufacturing process is complicated and a series of production lines is difficult.

[0004] Further, even if a series of production lines are used, the number of steps is increased, so that the production line is lengthened, and there is a problem that the entire production system becomes larger.

In view of the above problems, an object of the present invention is to provide a method of manufacturing a molded article capable of forming a coating layer of the molded article in a molding step.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention has taken the following technical means. That is, in the method for manufacturing a molded product according to the present invention, the molding material 1 is
3 is a method of manufacturing a molded product by abutting the mold material 15 on the mold surface 15 after the coating agent 5 is exposed on the mold surface 15 of the mold 13. It is characterized in that the coating agent 5 is applied to the molding material 1.

In the manufacturing method according to the present invention, the coating material 5 is applied to the molding material 1 when the molding material 1 is brought into contact with the mold surface 15 of the molding die 13 and molding is performed. By subjecting the coating agent 5 to drying and curing, a molded article having a cured surface on the surface can be manufactured. For this reason, there is an advantage that a step of applying the coating agent 5 to the molded article after separation from the molding die 13 is not necessarily required, and a series of production lines can be simplified. Further, since the coating agent 5 is applied from the mold surface 15 of the molding die 13, there is an advantage that the coating agent 5 can be surely applied even to a complicated molded product.

In the present invention, various methods can be adopted for bringing the molding material 1 into contact with the mold surface 15 of the molding die 13. For example, a fluid such as air is introduced into the cylindrical molding material 1 having a bottom. By press-fitting, the molding material 1 is expanded and the mold surface 15 is expanded.
It is possible to adopt a method in which the molding material 1 is brought into contact with the substrate.

Further, in the present invention, various methods can be adopted for exposing the coating agent 5 on the mold surface 15 of the mold 13, and for example, the mold surface 15 of the mold 13 can be applied to the mold surface 15. A method of applying the coating agent 5 or a method of permeating the coating agent 5 from the inside of the molding die 13 to the mold surface 15 made of a sintered metal as described in claim 5 can also be adopted.

In the present invention, the material of the molding material 1 is not particularly limited, but is preferably a thermoplastic synthetic resin, such as a cyclic polyolefin resin, a polyolefin resin such as polyethylene and polypropylene, or a polyester resin such as polyethylene terephthalate. More preferred.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

The blow molding machine 11 of the first embodiment includes a pair of dies 13 each having a mold surface 15 (mold surface) recessed on opposing surfaces, and the pair of dies 15 has a relative distance. It is provided so as to be changeable (contact / separation possible), and when the pair of molds 13 come into contact with / separate from each other, the mold surfaces 15 of the two
Is formed to open and close. Each of the molds 13 is formed with a recess 13a narrower than the mold surface 15, as shown in FIGS.
As shown in (a) and (b), when the molds 13 come into contact with each other, the outer surface of the mouth 1a of the bottomed cylindrical molding material 1 can be gripped by the recess 13a.

Further, the molding machine 11 has a mouth fixing device 19 capable of holding the mouth 1a of the parison 1 (forming material) from the inner surface side.
Is provided at a position corresponding to the concave portion 13a of the mold 13 so as to be able to advance and retreat, and further, an air blowing port (not shown) is provided in the
It is configured so that air can be injected into the inside of the. Also,
Inside the mouth fixing device 19, the bottom surface 15b of the mold surface 15 is provided.
The extension rod 21 which can advance and retreat to the inside is provided, and the extension rod 21 is, as shown in FIG.
In addition, the bottom 1 b of the parison 1 gripped by the concave portion 13 a of the mold 13 is protruded and can be brought into contact with the bottom surface 15 b of the mold surface 15.

Further, as shown in FIG. 1A, the molding machine 11 sprays a coating agent 5 onto the mold surface 15 by spraying the coating agent 5 when the mold 13 separates from the mold 13 so that the spray 17 is applied to the opposing portion of the mold 13. It is provided so as to be able to move forward and backward and move from the upper part to the lower part of the mold surface 17. In this embodiment, a pair of the sprays 17 is provided corresponding to each mold surface 15. In addition, as the coating agent, a cation-curable alicyclic epoxy resin paint containing a cationic ultraviolet polymerization initiator and an alicyclic epoxy resin is employed.

Next, a method for producing a molded article having a cured film on the outer surface using the molding machine 11 will be described.

First, as shown in FIG.
The molding space 14 is opened by separating them from each other, and the spray 17 is made to enter into the inside thereof.
Is applied by spraying 17 (application step). At this time, a pair of sprays 17 is applied to each mold surface 1.
The coating agent 5 is applied while moving 5 from top to bottom (or from bottom to top). By such an application step, the coating agent 5 is exposed on the mold surface 15.

Next, after the spray 17 is detached, the mouth fixing device 19 holding the bottomed cylindrical parison 1 is inserted, and
As shown in FIG. 1B, the molds 13 are brought into contact with each other to close the molding space 14 (closing step). As a result, the parison 1 is gripped and fixed at the mouth 1 a by the mouth fixture 19 and the recess 13 a of the mold 13. The parison 1 held by the mouth fixing member 19 is made of a thermoplastic synthetic resin such as polyethylene terephthalate, and has already been heated to a temperature suitable for stretching.

As shown in FIG. 2A, the bottom 1b of the parison 1 fixed by the mouth 1a is
After stretching the longitudinal axis by 1 and bringing it into contact with the bottom 13 b of the mold surface 13, a fluid such as air is pressed into the inside of the molding material 1 by the mouth fastener 19 to expand the parison 1 (horizontal axis stretching). Then, as shown in FIG. 2B, the outer surface of the molding material 1 is brought into contact with the mold surface 15 (molding step). At this time, the coating agent 5 applied to the mold surface 15 in the application step is applied to the outer surface (contact surface) of the molding material 1.

After the blow molded product formed by biaxially stretch blow molding the parison 1 as described above is cooled for a predetermined time, the mold 13 is opened and the molding space 14 is opened.
Release the molded product. Then, the released molded product is transferred to a UV irradiator or a heat dryer (not shown) to cure the coating agent 5 on the outer surface of the molded product (curing step). Thereafter, the holding of the mouth fixing device 19 is released, and a series of manufacturing steps of the molded product is completed.

On the other hand, after the molded product is separated, the spray 17 is placed in the opened molding space 14 as shown in FIG.
And the coating process is started, and thereafter, the closing process, the forming process, and the curing process are sequentially performed.

A molded product having a hardened surface can be manufactured by the above-described processes, and a step of applying a coating agent to a molded product detached from a mold as in the related art is unnecessary, so that a series of production lines can be simplified. It has the advantage of being

Further, since the coating agent 5 is applied from the mold surface 15 of the mold 13, there is an advantage that the coating agent 5 can be surely applied to the molding material 1 even if the molded article has a complicated shape.

In the first embodiment, the spray 17
Are provided corresponding to each mold surface 15, so that the application process can be sped up. However, the application process may be performed by one spray 17 or may be performed by three or more sprays 17. It is.

Next, a second embodiment of the present invention will be described. First, the molding machine 11 in the second embodiment will be described with reference to FIG. Note that the description of the same configuration as the first embodiment will be omitted.

The blow molding machine 11 of the second embodiment is provided with a pair of coating members 18 each having a coating surface 18a whose shape corresponds to the mold surface 15 of the mold 13. The coating member 18 is provided so as to be capable of moving forward and backward at a portion facing the mold 13 so as to apply the coating agent 5 to the mold surface 15. The coating surface 18 a is made of a material (for example, a sponge ), And is configured so that the coating agent 5 can be applied to the mold surface 15 by contacting the mold surface 15. The molding machine 11 of the second embodiment does not have the spray 17 of the first embodiment.

Next, a method for producing a molded article having a cured film on the outer surface using the molding machine 11 will be described.

First, as shown in FIG. 3, the molds 13 are separated from each other to open the molding space 14, and the coating member 1 is placed inside.
8, the coating surface 18a of the coating member 18 is brought into contact with the mold surface 15, and the coating agent 5 is applied to the mold surface 15 (application step). Thus, the coating agent 5 is exposed on the mold surface 15.

Next, after the application member 18 is detached from the mold 13, the closing step, the molding step, and the curing step are performed as in the first embodiment described above, and the holding of the mouth fixing member 19 is released. A series of manufacturing processes of the blow molded product is completed. In addition,
Also in the second embodiment, after the molded article is separated from the mold 13, the application member 18 enters the opened molding space 14 to start the application step, and thereafter, the closing step, the molding step,
Perform a curing step.

Since a molded article having an oxidation-hardened surface can be manufactured by the above-described steps, similar to the first embodiment, there is an advantage that a series of production lines is simple, and
There is an advantage that application of the coating agent 5 to the molding material 1 is reliable.

In the second embodiment, the spray 17
However, the above-described coating member 18 is not provided.
At the same time, the application step can be performed by the spray 17.

Next, a third embodiment of the present invention will be described. First, the molding machine 11 in the third embodiment will be described with reference to FIG. Note that the description of the same configuration as the first embodiment will be omitted.

In the molding machine 11 of the third embodiment, the mold surface 15 of the mold 13 is made of a sintered metal.
Preferably, a breathable metal mold manufactured by Shinto Kogyo Co., Ltd. (trade name:
Porcelax) average hole diameter = 20 μm, porosity = 2
Use 5%, density = 6.0-6.2 g / cm ³ . The supply path 12 for supplying the coating agent 5 to the mold surface 15 is formed in the mold 13. The supply passage 12 has a supply port 12a on the outer surface side of the mold 11, and a plurality of spouts 12b branched from the supply port 12a. The supply port 12a of the supply passage 12 is connected to a coating agent container (not shown) via a pump (not shown). The pump (coating agent supply means) is controlled so that the coating agent 5 permeates and always appears on the mold surface 15. Also, the mold surface 15
As the coating agent 5 suitable for expressing the above, for example, a mixture obtained by mixing 50% by weight of phenylglycidyl ether as a diluent with a coating agent of a curable alicyclic epoxy resin can be used. Can be used. In the third embodiment, the spray 17 of the first embodiment and the coating member 18 of the second embodiment
Do not have.

Next, a method for producing a molded article having an oxidation cured film on the outer surface using the molding machine 11 will be described.

First, the molds 13 are separated from each other and the molding space 1
In a state where the molding member 4 is opened, the mouth fixing device 19 holding the molding member 1 is inserted, and the molds 13 are brought into contact with each other (clamped) as shown in FIG. 14 is closed (closing step). Then, when the same molding process as in the first embodiment is performed, the coating agent 5 penetrating the sintered metal and exposed on the mold surface 15 is applied to the outer surface (contact surface) of the molding material 1. Becomes Hereinafter, similarly to the first embodiment, a hardening process is performed to release the holding of the mouth fastener 19, and a series of manufacturing processes of the molded product is completed. In the third embodiment, after the molded product is detached from the mold 13, the closing fixture 19 is inserted into the opened molding space 14 by inserting the mouth fixing device 19 holding the molding material 1 before molding. Thereafter, a molding step and a curing step are sequentially performed.

A molded article having an oxidatively cured surface can be manufactured by the above-described steps. As in the first and second embodiments, a series of production lines is simple, and the coating agent 5 can be applied to the molding material 1. It has the advantage of being reliable.

Further, since the coating agent 5 is permeated from the inside of the mold 13 and the coating agent 5 is exposed on the mold surface 15 of the mold 13, the coating process as in the first and second embodiments can be performed. It has the advantage that it is unnecessary.

In the third embodiment, the mold surface 1
Although the description has been given of the case where the mold 5 is made of a sintered metal, the entire mold 13 may be made of a sintered metal.

In each of the above-described embodiments, the parison 1 is longitudinally stretched by the stretching rod 21 in the forming step. However, the present invention is not limited to this. A method can be adopted.

Further, although the description has been made by taking the bottomed cylindrical parison 1 as an example, the present invention is not limited to this. For example, a bottomless cylindrical one, a stack of two sheets, etc.
Various molding materials can be adopted.

[0040]

As described above, according to the present invention,
This has the effect that a coated molded article can be easily and reliably manufactured.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a molding machine according to a first embodiment of the present invention, in which (A) is a cross-sectional view of an application step, and (B) is a cross-sectional view of a closing step.

FIG. 2 is an explanatory view of a molding machine according to the embodiment;
(A) is a cross-sectional view in a state where the forming material is stretched on the longitudinal axis by a stretching rod, and (B) is a cross-sectional view in a state where the outer surface of the forming material is in contact with a mold surface.

FIG. 3 is a sectional view of a molding machine in an application step according to a second embodiment of the present invention.

FIG. 4 shows a sectional view of a closing step in a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 molding material (parison) 5 coating agent 11 molding machine 12 supply passage 13 molding die (mold) 15 mold surface (mold surface) 17 spray 18 coating member

Claims (7)

[Claims] 1. A method for manufacturing a molded product by bringing a molding material (1) into contact with a mold surface (15) of a molding die (13), wherein the molding material (1) is provided on the mold surface (15) of the molding die (13). After the coating agent (5) is exposed, the molding material (1) is brought into contact with the mold surface (15), and the coating material (5) is applied to the molding material (1). To manufacture molded products. 2. A coating agent (5) is applied to a mold surface (15) of the molding die (13) to thereby form the mold surface (1).
The method for producing a molded article according to claim 1, wherein the coating agent (5) is exposed in the step (5). 3. The method for producing a molded article according to claim 2, wherein the coating agent (5) is applied by spraying the coating agent (5) on a mold surface (15) of the mold (13). 4. The coating agent (5) is applied by applying an application member (18) having an abutting surface along the shape of the molding die (13) to the molding surface (15) of the molding die (13). 3. The method for producing a molded product according to claim 2, wherein the method is performed by contacting. 5. A mold (13) having at least a mold surface (15) made of sintered metal and having a coating agent (5) penetrated from the inside of the mold (13).
The method for producing a molded article according to claim 1, wherein the coating agent (5) is exposed on the surface. 6. The method according to claim 1, further comprising a step of curing the coating agent (5) applied to the molding material (1) to form a cured surface on the molded article. A method for producing the molded article according to the above. 7. A molded product formed by bringing a molding material (1) into contact with a mold surface (15) of a molding die (13), wherein the molding material (1) is formed from the mold surface (15) of the molding die (13). A molded article comprising a cured surface formed by curing an applied coating agent (5).