JP2001191362A - Molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding machine wherein an excellent appearance is indicated by excellently fixing a surface treated sheet to a mold, and a molded product to which surface treatment is applied is efficiently molded. SOLUTION: A suction groove 14b is equipped to all periphery along a bottom part of a molded recessed part 14a provided to a fixed mold 14, a sticking sheet S is fixed by adsorption to the suction groove 14b, and molten resin is injected from an injection gate 20 between the sticking sheet S and a transfer film F supplied along an opposed contact surface of a movable mold 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for molding a resin product, and more particularly, to molding a resin product in a molding section provided on a mold, and simultaneously performing a predetermined surface treatment using a sheet for surface treatment on both surfaces. The molding device to be applied belongs to the technical field of resin molding.

[0002]

2. Description of the Related Art Conventionally, in a state in which a transfer film is interposed between a pair of dies, a molten resin is injected into a cavity formed by the two dies to form a product having a predetermined shape, and at the same time, a surface of the product is formed. There is known a simultaneous molding transfer technique for transferring a design from the transfer film. For example, Japanese Patent Application Laid-Open No. 6-99457 discloses a manufacturing method and a molding die capable of transferring a pattern to both surfaces of an injection-molded product by using this technique.

In the manufacturing method described in the above publication, a pair of transfer films are supplied between the opposite molds in parallel along the contact surfaces of the two molds, and one transfer film is supplied to the other mold. By injecting the molten resin between the pair of transfer films from the injection gate in this state to form an injection molded product conforming to the cavity shape, at the same time, a pair of front and back surfaces of the injection molded product are formed. The design is transferred from the transfer film.

In this technique, in order to supply a molten resin between both transfer films in a stable state, one transfer film is adsorbed and fixed to one mold. The mold is provided with a suction device for sucking the transfer film, and as a component of the suction device, a passage for air suction opening toward the transfer film is formed in the mold. Air is sucked through the passage and the transfer film is suction-fixed.

[0005]

Incidentally, this kind of air suction passage is usually provided in the form of a point. In this case, the point where the transfer film is suction-fixed is dotted, so that the molten resin injected from the injection gate flows between a pair of transfer films and also forms around the suction-fixing point. In some cases, the liquid may pass through a gap between the transferred transfer film and the mold, and flow into a space formed by the back surface of the transfer film and a molding portion provided in the mold. As a result, an abnormality such as a wrinkle occurs in the transfer film, and a pattern transferred from the film to a molded product may have a poor appearance such as a wrinkle. Even if the air suction passages are provided in a line in the mold, the appearance defect may be reduced, but it is not essentially solved.

Further, when it is necessary to perform a surface treatment on one surface of a molded product so as to have various functions, the transfer film may not be able to cope with the surface treatment conditions depending on the surface treatment conditions.
Furthermore, even if the surface treatment can be performed using the transfer film, the transfer film is usually supplied in a belt shape.For example, when frequently changing the surface treatment conditions on one side of the molded product, the transfer Changing the film may be troublesome.

Accordingly, the present invention is to provide a molding apparatus which shows a good appearance by fixing a sheet for surface treatment to a mold well and efficiently molds a molded article having been subjected to surface treatment. Make it an issue.

[0008]

That is, in order to solve the above problems, the present invention is characterized in that it is configured as follows.

First, the invention according to claim 1 (hereinafter referred to as first invention)
According to the invention), a pair of surface treatment sheets is supplied between a pair of dies arranged so as to be able to relatively come into contact with and separate from each other. In a molding device configured such that a molded article of a predetermined shape is formed by the molten resin supplied to the resin, and at the same time, both surfaces of the molded article are subjected to the predetermined surface treatment by the two surface treatment sheets, respectively. An adsorption unit that adsorbs one surface treatment sheet to one of the two molds, and a resin injection unit that injects a molten resin between the two surface treatment sheets, wherein the adsorption unit includes: At least along the edge of the molding portion near the injection port of the resin injection means, an adsorption groove for applying a negative pressure to the surface treatment sheet, and an air suction passage communicating therewith,
Air suction means.

Next, the invention according to claim 2 (hereinafter referred to as second invention)
The present invention is characterized in that, in the first invention, each of the pair of surface treatment sheets is a transfer film for transferring a predetermined design to the surface of a molded product.

According to a third aspect of the invention (hereinafter referred to as a third aspect), in the first aspect, each of the pair of surface treatment sheets is used by being attached to the surface of a molded article. It is a sticking sheet.

Further, in the invention according to claim 4 (hereinafter referred to as a fourth invention), in the first invention, one of the surface treatment sheets is attached to one surface of a molded article. In addition to the sheet, the other surface treatment sheet is a transfer film that transfers a predetermined pattern to the other surface of the molded product.

According to the above configuration, the following operation can be obtained.

According to the first aspect of the invention, there is provided a suction means for adsorbing one surface treatment sheet to one of the two molds, and a resin for injecting a molten resin between the two surface treatment sheets. Injection means, and the adsorption means includes:
At least along the edge of the molding portion near the injection port of the resin injection means, an suction groove for applying a negative pressure to the surface treatment sheet, an air suction passage communicating with the suction groove, and air suction means are provided. Therefore, the surface treatment sheet is attracted to the mold by air suction performed through the suction groove. Therefore, it is avoided that the molten resin flows into the space formed by the back surface of the sheet for surface treatment and the molding portion provided in the mold, and the molten resin flows between the two sheets satisfactorily. In addition, appearance defects such as wrinkles do not occur on the surface of the molded product.

In particular, when the suction groove is provided on the entire periphery along the edge of the molding portion, the above-mentioned molten resin does not flow in at all.

Next, according to the second invention, in the first invention, since each of the pair of surface treatment sheets is a transfer film for transferring a predetermined pattern to the surface of a molded article, the predetermined sheets are formed on both surfaces. The molded product to which the pattern of the above is transferred can be easily obtained.

According to the third aspect, in the first aspect, since each of the pair of surface treatment sheets is an adhesive sheet used by being attached to the surface of a molded article, for example, the functional sheet Thus, a molded article having a sheet having both sides adhered to both sides can be easily obtained.

In addition, since a sticking sheet in the form of a sheet can be used, it is not necessary to frequently change the surface treatment conditions on both sides.

According to a fourth aspect of the present invention, in the first aspect, the one surface treatment sheet is an adhesive sheet used by being attached to one surface of a molded article, and the other surface treatment sheet is used. Since the sheet is a transfer film that transfers a predetermined design to the other surface of the molded product, for example,
A molded article having a surface having a predetermined function on one side can be easily obtained.

In addition, since a sheet-shaped sticking sheet can be used, it is not necessary to frequently change one-side surface treatment conditions when the surface treatment conditions need to be changed.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described.

FIGS. 1 and 2 show an example of a molding apparatus 10 according to the present embodiment.

The molding apparatus 10 includes a fixed base 12 and a movable base 13 which are supported by a plurality of guide rods 11 and are arranged to face each other, and a fixed mold 14 fixed to the fixed base 12. And a movable mold 15 fixed to the movable base 13 so as to face the fixed mold 14.

The fixed mold 14 has a molding recess 14a conforming to the shape of the molded product and a runner 16 as a supply path of the molten resin, and is supported by the fixed base 12 via a support block 17. I have. Further, an injection passage 19 connected to an injection nozzle 18 for injecting the molten resin.
Are communicated with an injection gate 20 of the molten resin opened in the runner 16.

On the other hand, above the movable base 13,
The supply means 21 for the transfer film F,
A winding means 22 for the transfer film F after the transfer is provided, respectively, and these two means 21 and 22 transfer the transfer film F along the contact surface of the movable mold 15 to the front surface of the molding recess 15 a provided in the movable mold 15. The film F can be supplied. In that case, the injection gate 20
The transfer film F is located at the front portion of the transfer film F.

The movable base 13 is provided so as to be able to come into contact with and separate from the fixed base 12 via guide rods 11 by means of a cylinder 23 supported on a base (not shown).

Here, the feature of the first embodiment is as follows.
A description will be given of a means for adsorbing an adhesive sheet as a surface treatment sheet provided on the fixed mold 14.

First, the affixed sheet S is placed in
The sheet has a sheet shape conforming to the shape of the bottom of a, and is supplied to the bottom of the molding recess 14a manually or automatically.

An adsorbing groove 14b for adsorbing and fixing the adhesive sheet S is provided along the entire bottom along the bottom of the molding recess 14a. Further, one end of a plurality of air suction branch passages 24a... 24a branched from the air suction passage 24 is provided so as to open to the bottom of the suction groove 14b, and one end of the air suction passage 24 is connected to an air suction pump 25. It is connected to the. Thus, by operating the air suction pump 25 to perform air suction, the suction force reaches the suction groove 14b via the air suction passage 24 and the air suction branch passages 24a... 24a.

The sticking sheet S may be a decorative sheet for decorating a picture or pattern, a conductive sheet for imparting conductivity to provide, for example, an electromagnetic wave shielding function,
Various functional sheets such as a mat sheet for providing a matte surface, a hard sheet for preventing damage, and an optical sheet for providing an antireflection function are used.

Next, an operation example of the molding apparatus 10 will be described.

First, in a state where the movable mold 15 is separated from the fixed mold 14 and the movable sheet 15 is opened, the adhesive sheet S is fed into the bottom of the molding recess 14 a of the fixed mold 14. And
When the air suction pump 25 is operated, the suction force is transmitted to the suction groove 14b via the air suction passage 24 and the air suction branch passages 24a... 24a, and the above-mentioned attached sheet S is suction-fixed to the suction groove 14b.

On the other hand, the transfer film F is formed so that the pattern to be transferred is positioned at a predetermined position.
It is sent to the front of 5a.

Next, the operation of the cylinder 23 causes the movable mold 15 to come into contact with the fixed mold 14 so that the movable base 13
Is moved closer to the fixed side base 12 to perform mold clamping. Then, the molten resin is injected into a space formed by the molding concave portion 14a provided in the fixed mold 14 and the molding concave portion 15a provided in the movable mold 15, and the heat and pressure at that time cause the adhesive sheet S and the transfer film to be transferred. F fully adheres to the molding recess 14a and the molding recess 15a, respectively, and the runner 16 and the molding recesses 14a, 15a are filled with resin to form a molded product. Pasting of the pasting sheet S and transfer film F to the other surface
Is transferred.

After completion of the molding, the movable base 13
Is separated from the fixed side base 12, and the molded product from which the base member of the transfer film F has been removed is taken out.

In this case, since the suction groove 14b for sucking and fixing the adhesive sheet S is provided along the entire bottom along the bottom of the molding recess 14a, the injection gate 19 is provided.
Does not flow into the space formed by the back surface of the adhesive sheet S and the bottom of the molding recess 14a provided in the fixed die 14, so that a molded article having a good appearance can be obtained. become.

Further, since the adhesive sheet S having the function according to the purpose can be supplied as appropriate, various molded products can be efficiently obtained.

Next, a description will be given of a molding apparatus according to a second embodiment of the present invention.

The molding apparatus 30 shown in FIGS. 3 and 4 comprises a fixed base 32 and a movable base 33 supported by a plurality of guide rods 31.
It has a fixed mold 34 fixed to the fixed base 32 and a movable mold 35 fixed to the movable base 33 so as to face the fixed mold 34.

The fixed mold 34 has a molded concave portion 34 a corresponding to the shape of the molded product, and is supported by the fixed base 32 via the support block 36. Further, an injection nozzle 37 for injecting the molten resin is provided in the fixed side base 32, and an injection passage 38 connected to the injection nozzle 37 is communicated with an injection gate 39 for the molten resin.

The movable mold 35 has a molding recess 35a conforming to the shape of the molded article, and both transfer films F1 and F2.
Runner 40 which is a supply path for supplying molten resin therebetween
And When the fixed mold 34 and the movable mold 35 are in contact with each other, one end of the injection gate 39 opens to the runner 40.

On the other hand, above the fixed side base 32 and the movable side base 33, supply means 41 and 42 for a pair of transfer films F1 and F2 are provided, and below the transfer films F1 and F2 after transfer are provided below. Winding means 43 and 44 are provided, respectively, and these means 41 to 44 transfer the transfer film F along the contact surface between the fixed mold 34 and the movable mold 35.
1 and F2 can be supplied. In this case, the transfer film F2 is located in front of the injection gate 39.

The movable base 33 is provided so as to be able to come into contact with and separate from the fixed base 32 via guide rods 31 by means of a cylinder 45 supported by a base (not shown).

Here, the feature of the second embodiment is as follows.
The means for adsorbing one transfer film F1 provided on the fixed mold 34 will be described.

First, a suction groove 34b for suction-fixing the transfer film F1 is provided on the entire circumference along the molding recess 34a. Further, one end of a plurality of air suction branches 46a... 46a branched from the air suction passage 46 is provided so as to open at the bottom of the suction groove 34b, and one end of the air suction passage 46 is connected to the air suction pump 4.
7 is connected. Thereby, the air suction pump 4
7, the air suction is performed by the air suction passage 46 and the air suction branch 4
6a to 46a and reach the suction groove 34b.

Next, an operation example of the molding apparatus 30 will be described.

First, in a mold opening state in which the movable mold 35 is separated from the fixed mold 34, a pair of transfer films F
1 and F2 are fed into the front surfaces of the molding recess 34a of the fixed mold 34 and the molding recess 35a of the movable mold 35, respectively, so that the symbols to be transferred are arranged at predetermined positions. When the air suction pump 47 is operated, the suction force is transmitted to the suction groove 34b via the air suction passage 46 and the air suction branch passages 46a.
1 and F2, the transfer film F1
b.

Next, by operating the cylinder 45, the movable mold 35 is brought into contact with the fixed mold
Is moved closer to the fixed side base 32 to perform mold clamping. Then, the light is injected from the injection gate 39 and the runner 4
The molten resin supplied to the movable mold 35 has a molding recess 34a provided in the fixed mold 34 and a molding recess 35a provided in the movable mold 35.
And flows into the space formed by Due to the heat and pressure at that time, the two transfer films F1 and F2 come into close contact with the molding recesses 34a and 35a, respectively,
At the same time, the molded product is formed by filling the resin and the molded concave portions 34a and 35a with the resin, and at the same time, the design is transferred from both transfer films F1 and F2 to both surfaces of the molded product.

After completion of the molding, the movable base 33
Is separated from the fixed-side base 32, and the molded product from which the base members of the transfer films F1 and F2 have been removed is taken out.

In this case, one transfer film F
Since the suction groove 34b for sucking and fixing 1 is provided on the entire circumference along the molding concave portion 34a, the molten resin injected from the injection gate 39 and supplied to the runner 40 is applied to the back surface of the transfer film F1. Does not flow into the space defined by the bottom of the molding recess 34a provided in the fixed mold 34, and a molded article having a good appearance can be obtained.

In the first embodiment, the adhesive sheet S is supplied in a sheet shape conforming to the shape of the bottom of the molding recess 14a. May be supplied. In this case, a fixed type having the same structure as that described in the second embodiment is used.

In the first embodiment, the adhesive sheet S is supplied in a sheet shape conforming to the shape of the bottom of the molding recess 14a. Similarly, it may be supplied in the form of a strip. In this case, a fixed type having the same structure as that described in the second embodiment is used. And
When molding, pasting, and transfer are completed, the molded article is in a state of being adhered to the band-shaped pasting sheet, and can be cut at a predetermined location to obtain a product.

In the first embodiment, the suction groove 14b for sucking and fixing the adhesive sheet S is provided along the entire circumference of the molding recess 14a. If the production cost is limited, or if it is considered that there is little possibility that the injected molten resin flows into the space formed by the back surface of the adhesive sheet and the bottom of the molding recess, the suction groove is formed by the molten resin. It may be provided only along the edge of the molding recess near the injection gate.

In the second embodiment, the suction groove 34b for suction-fixing the transfer film F1 is provided along the entire shape of the molding recess 34a. Alternatively, it may be provided only along the edge of the molding recess near the injection gate of the molten resin.

In the above description of the embodiment, both of the pair of surface treatment sheets are
Although the case where the adhesive sheet is used by being attached to the surface of a molded article is not described, in this case, a fixed mold having the same structure as that described in the second embodiment is used. Then, since the molten resin flows between the two sheets satisfactorily, a molded article having a good appearance can be obtained.

[0056]

As described above in detail with reference to the specific examples, according to the first aspect, the suction means for sucking one surface treatment sheet to one of the two dies, Resin injection means for injecting the molten resin between the surface treatment sheets is provided, and the adsorption means includes a resin injection means, at least along an edge of a molding portion close to an injection port of the resin injection means. Since the suction groove for applying a negative pressure, the air suction passage communicating with the suction groove, and the air suction means are provided, the surface treatment sheet is suctioned to the mold by the air suction performed through the suction groove. Become so. Therefore, it is avoided that the molten resin flows into the space formed by the back surface of the sheet for surface treatment and the molding portion provided in the mold, and the molten resin flows between the two sheets satisfactorily. In addition, appearance defects such as wrinkles do not occur on the surface of the molded product.

In particular, when the suction groove is provided on the entire circumference along the edge of the molding concave portion, the above-mentioned molten resin does not flow in at all.

Next, according to the second invention, in the first invention, since each of the pair of surface treatment sheets is a transfer film for transferring a predetermined pattern to the surface of a molded article, the predetermined sheets are formed on both surfaces. The molded product to which the pattern of the above is transferred can be easily obtained.

According to the third invention, in the first invention, since each of the pair of surface treatment sheets is a sticking sheet used by sticking to the surface of a molded article, for example, Thus, a molded article having a sheet having both sides adhered to both sides can be easily obtained.

In addition, since a sheet-shaped sticking sheet can be used, when it is necessary to frequently change the surface treatment conditions of both surfaces, it is not necessary to take time and effort.

Further, according to the fourth invention, in the first invention, the one surface treatment sheet is an adhesive sheet used by being adhered to one surface of a molded article, and the other surface treatment sheet is used. Since the sheet is a transfer film that transfers a predetermined design to the other surface of the molded product, for example,
A molded article having a surface having a predetermined function on one side can be easily obtained.

In addition, since a sheet-shaped sticking sheet can be used, it is not necessary to frequently change the surface treatment conditions on one side.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a molding apparatus according to a first embodiment.

FIG. 2 is a plan view showing a configuration of a fixed type according to an air line in FIG. 1;

FIG. 3 is a diagram showing an overall configuration of a molding apparatus according to a second embodiment.

FIG. 4 is a sectional view taken along the line II in FIG. 3;

[Explanation of symbols]

 10, 30 Molding device 14, 34 Fixed mold 14a, 34a Mold recess 14b, 34b Suction groove 15, 35 Movable mold 15a, 35a Mold recess 16, 40 Runner 20, 39 Injection gate 24, 46 Air suction passage 24a, 46a Air suction Fork 25,47 Air suction pump F, F1, F2 Transfer film S Adhesive sheet

Claims (4)

[Claims] 1. A pair of surface treatment sheets are supplied between a pair of dies arranged relatively to be able to come into contact with and separated from each other, and when both dies are brought into contact with each other, a molding portion provided on the dies. The molding apparatus is configured so that a molded article having a predetermined shape is molded by the molten resin supplied to the mold and, at the same time, both surfaces of the molded article are subjected to the respective predetermined surface treatments by the sheets for both surface treatments. A suction means for adsorbing one surface treatment sheet to one of the two molds, and a resin injection means for injecting a molten resin between the two surface treatment sheets are provided, The suction means includes a suction groove for applying a negative pressure to the sheet for surface treatment, an air suction passage communicating with the suction groove, and an air suction means, at least along an edge of the molding portion near the injection port of the resin injection means. A molding device, which is provided. 2. Both of the pair of surface treatment sheets,
2. The molding apparatus according to claim 1, wherein the molding apparatus is a transfer film for transferring a predetermined symbol on a surface of a molded article. 3. Both of the pair of surface treatment sheets,
The molding apparatus according to claim 1, wherein the molding apparatus is a sticking sheet used by being attached to a surface of a molded article. 4. One surface treatment sheet is an adhesive sheet used by being adhered to one surface of a molded article, and the other surface treatment sheet is provided with a predetermined pattern on the other surface of the molded article. The molding apparatus according to claim 1, wherein the molding apparatus is a transfer film that transfers the film to a surface.