KR100778831B1 - A catapult for inserting the film - Google Patents

Abstract

The present invention relates to a composite injection molding machine for a film insert, and more particularly, a conventional three-stage injection molding machine for forming and trimming a film in a conventional press mold and an injection process in a conventional injection mold. It relates to a composite injection molding machine for film insert improved.

The composite injection molding machine for the film insert of the present invention can be shortened the manufacturing process by performing the forming process of the film, the injection process of the product body and the removal of the film end by improving one injection mold without the need for a separate press mold. In addition, there is an advantage that the adhesion of the film and the injection molding can be made uniformly and powerfully without a separate preheating process. Accordingly, there is an advantage that the production of excellent products can be made, and the labor productivity can be improved.

Injection, Insert, Film, Film Forming Method

Description

Composite Injection Molding Machine for Film Inserts {A CATAPULT FOR INSERTING THE FILM}

1A to 1D are schematic cross-sectional views of a composite injection molding machine for a film insert according to an exemplary embodiment of the present invention.

Figure 2 is a photograph of the product (film coated state) and the film not coated product produced using the composite injection molding machine for a film insert of the present invention.

<Explanation of symbols for main parts of drawing>

100: compound injection molding machine 10: fixed side mounting plate

11: Injection liquid injection nozzle inlet 12: Guide bar

20: upper mold 21: upper holder

22: spring 23: stripper bolt

24: upper side plate 25: inclined core

30: lower mold 31: lower holder

32: eject rod 33: film fixing pin

34: Lower template 35: Moving side mounting plate

36: cylinder eject plate 37: hydraulic cylinder

40: film

The present invention relates to a composite injection molding machine and a composite injection method for a film insert, and more particularly, to form and trim a film of a conventional press mold and an injection process of a conventional injection mold in one injection mold. The present invention relates to a composite injection machine and a composite injection method for a film insert in which the three-stage injection machine is improved.

In general, in order to protect the surface of the plastic injection molding, while increasing the beauty and quality of the product, a technique for forming a transfer film and similar films on the surface of the plastic injection molding is widely used. This applies not only to telephones, washing machines and car interiors, but also to almost all injection moldings such as shoe parts, snowboards, skis, inline skates, and rice cookers. Due to the risk of tearing and difficult to finish the film, the development of technology is constantly required.

Conventionally, a method of forming a film on a plastic injection molding is generally as follows. First, the film is made into a certain shape (ie, foamed) using a press die. That is, the film is compressed with a vertical punch of a press die having a shape of a product to form a film of a desired shape. Then, it is inserted into a separate injection mold and then the injection is put on it to produce a product coated with a film on the surface. In addition, since a cut film remains at the edge of the product, the film (cut film) at the edge of the product is removed by a worker with a knife.

This conventional film forming method has a disadvantage in that two separate molds (press mold and injection mold) are required, and since the operator cuts the end of the film with a knife, the product may be damaged and the defect rate of the product is high. there was. In addition, in the conventional method, when the film is formed in the press die, heat is applied to the upper and lower punches at 90-120 ° C. The size of the film is returned to its original state because the heat is lost when the film is taken out after the pressing process. It was difficult to predict accurately.

The present invention has been made to solve the above problems, the object of the present invention is to improve the injection molding without the need for a separate press mold, performing the film forming process, the product injection process and the film removal process The present invention provides a composite injection molding machine for film inserts.

Another object of the present invention is to form a film, and after injection molding, it is possible to cut the unnecessary film end, not only shorten the manufacturing process but also the adhesion of the film and the injection molding is uniform and strong adhesion without a separate preheating process The present invention provides a composite injection molding machine for film inserts.

In order to achieve the above object, the composite injection molding machine for a film insert of the present invention is improved by a conventional three-stage injection machine formed with a movable side mounting plate portion, an upper mold portion and a fixed side mounting plate portion; The movable side mounting plate portion has a cylinder eject plate 36 advancing back and forth by a hydraulic cylinder 37, and a lower holder 31 and a lower holder fixedly connected to the cylinder eject plate 36 by an eject rod 32. A lower mold 30 in 31; The upper mold part is wrapped in an upper holder 21 corresponding to the lower holder 31, a spring 22 formed between the upper holder 21 and the upper mold plate 24, and the upper holder 21. A phosphorous upper mold 20; The lower mold 30 is fixed to the lower template 34 in a slidable state with the lower holder 31, and the upper mold 20 is fixed to the lower template 24 in a slidable state to the upper holder 21. Become; The upper holder 21 and the upper template 24 are spaced apart by a predetermined distance b to be elastically supported by the spring 22; The hydraulic cylinder 37 advances the cylinder eject plate 36 and the lower holder 31 fixed to the cylinder eject plate at a predetermined interval back and forth by a predetermined interval (a, b, c). After film forming, the hydraulic cylinder 37 reverses the lower holder by reversing a predetermined interval, and after injection molding, the hydraulic cylinder 37 pushes the lower holder and the upper holder while advancing the predetermined interval and lower holder 31 and the lower mold 30. As the slide is cut, the film ends are cut.

Preferably, the lower holder 31 is formed in the film fixing pin 33, and the upper holder 21 is formed with a groove corresponding to the film fixing pin 33.

Hereinafter, with reference to the accompanying drawings will be described in more detail the composite injection molding machine for a film insert of the present invention.

1A to 1D are schematic cross-sectional views of a composite injection molding machine for a film insert according to an exemplary embodiment of the present invention.

1A shows a state in which the injection machine of the present invention is opened. The injection machine of the present invention is an improvement of the conventional three-stage injection machine, and is largely composed of a fixed side mounting plate portion, an upper mold portion, and a movable side mounting plate portion, like a conventional three-stage injection machine.

When explaining the movable side mounting plate part, the movable side mounting plate 35 is movable in the arrow direction to an outer cylinder (not shown). The lower mold 30 is wrapped by the lower holder 31. The lower holder 31 is fixedly connected to the cylinder eject plate 36 by the eject rod 32, and the cylinder eject plate 36 is moved forward or backward by the hydraulic cylinders 37 on both sides. The lower die 30 is fixed to the lower die 34, and the lower die 34 is fixed to the movable side mounting plate 35. Therefore, the lower die 30 is not fixed to the lower holder 31 but is in an opposing state, and the lower die 30 is slidable in an opposing state.
In FIG. 1, the cylinder eject plate 36 is advanced so that the cylinder eject plate 36 and the movable side mounting plate 35 are spaced apart by a distance. A film fixing pin 33 is formed on the surface of the lower holder 31, and the film 40 is fixed by the pin 33. In the injection molding machine of the present invention, a separate film fixing plate is not required to fix the film, but the film is fixed to the film fixing pin 33 on the surface of the lower holder 31 surrounding the lower mold 30. In the above, preferably the intervals a, b, c are the same.

Referring to the upper mold part, the upper mold part is moved by the guide bar 12 by driving of a cylinder (not shown). An upper holder 21 surrounding the upper mold 20 is formed, and a groove corresponding to the film fixing pin 33 is formed in the upper holder 21. The upper holder 21 and the upper template 24 surrounding the upper holder 21 are connected by the stripper bolt 23, and a spring 22 is formed therebetween. In the state where no pressure is applied to the upper holder 21, the upper holder 21 and the upper template 24 are spaced apart by the b interval by the elastic force of the spring 22. The upper die 20 is fixed to the upper die 24. Therefore, the upper die 20 is not fixed to the upper holder 21 but is in an opposing state, and the upper die 20 is slidable in an opposing state.
The inclined core 25 is installed to take out the product after the injection is made. Inclined core is a part widely used in the prior art.

Referring to the fixed side mounting plate portion, the fixed side mounting plate 10 is a fixed portion irrespective of the operation of the injection molding machine. The injection liquid injection nozzle injector 11 is a part where the injection liquid injection nozzle (not shown) contacts, and the injection liquid is injected between the upper mold and the lower mold through the injection unit 11.

FIG. 1B is a view after the movable side mounting plate portion and the upper mold portion are moved in the direction of the arrow in the state of FIG. 1A to form the film, and the injection molding material is injected.

In the film 40, the upper holder and the lower holder face each other. Forming of the film is made while the upper mold 20 and the lower mold 30 are engaged. This is similar to the press process in the press die. First, the film is compressed between the upper mold and the lower mold, thereby forming a film of a constant shape. The spring 22 formed between the upper plate and the upper holder has a resilient repulsive force to apply a constant force during film forming.

Thereafter, the hydraulic cylinder 37 reverses and retracts the cylinder eject plate 36, thereby reversing the lower holder 31. Accordingly, the space between the lower template 34 and the cylinder eject plate 36 is spaced by c intervals. In this state, the plastic injection liquid is introduced through the injection liquid injection nozzle input unit 11.

FIG. 1C illustrates a state in which the lower holder 31 moves forward by cutting the edges of the film by driving the hydraulic cylinder 37 in FIG. 1B. The cylinder eject plate 36 is advanced by driving the hydraulic cylinder 37 to form a gap between the cylinder eject plate 36 and the movable side mounting plate 35, and the cylinder eject plate 36 is an eject rod. Advance the lower holder 31 connected with (32). Accordingly, the lower holder 31 advances the upper holder 21 which is in contact with it again. As the upper holder 21 moves forward, the b gap between the upper holder 21 and the upper template 24 disappears. In the state in which the upper mold 20 and the lower mold 30 are stopped, the upper holder 21 and the lower holder 31 surrounding the same are advanced at a time, so that the film at the end of the injection molded article is cut. That is, the lower mold 30 is advanced by the upper holder 31 surrounding it in a fixed state by a predetermined interval, the lower mold 30 and the lower holder 31 is spaced apart while sliding the cutting of the film end.
In a conventional general injection molding machine, cutting is performed using a separate cutting member like a blade, but in the present invention, instead of separately installing the cutting member, the upper holder surrounding the upper mold and the lower holder surrounding the lower mold are in contact with each other, The upper holder and the lower holder are advanced together at a time so as to cut the ends of the film.

1D shows how the molded article is taken out by the inclined core. While the upper mold part and the movable side mounting plate part are separated, the upper holder 22 is spaced apart from the upper mold plate 24 by the spring 22 by b spacing, while the inclined core 25 of the upper mold part is advanced in the inclined direction. The injection molded product 50 is taken out from the upper mold 30.

As a result, a film is coated on the surface of the injection molded product having a deep uneven shape and a high curvature of the shape to produce a finished product.

Figure 2 is a photograph of the product (film coated state) and the film not coated product produced using the composite injection molding machine for a film insert of the present invention. That is, the upper product is a photograph of a conventional product without a film coated, and the lower photograph is a photograph of a product coated with a film completed using the composite injection molding machine for a film insert of the present invention. The injection molded part is a part attached to the side of the inline skate. As such, even in the case of an injection-molded product having a deep uneven shape and a severe curvature of the shape, a product of excellent quality may be produced when the film is coated using the injection machine of the present invention.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order to better understand the claims of the invention which will be described later. Additional features and advantages constituting the claims of the present invention will be described below. It should be appreciated by those skilled in the art that the conception and specific embodiments of the invention disclosed may be readily used as a basis for designing or modifying other structures for carrying out similar purposes to the invention.

In addition, the inventive concepts and embodiments disclosed herein may be used by those skilled in the art as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. In addition, such modifications or altered equivalent structures by those skilled in the art may be variously changed, substituted and changed without departing from the spirit or scope of the invention described in the claims.

As described above, the composite injection molding machine for the film insert of the present invention can perform the forming process of the film, the injection process of the product, and the removal of the film end by improving one injection mold without requiring a separate press mold. Not only is the manufacturing process shortened, but there is an advantage that the adhesion of the film and the injection molding can be made uniformly and powerfully without a separate preheating process. Accordingly, there is an advantage that the production of excellent products can be made, and the labor productivity can be improved.

Claims (3)

In the three-stage injection machine formed with the movable side mounting plate portion, the upper mold portion and the fixed side mounting plate portion, The movable side mounting plate portion has a cylinder eject plate 36 advancing back and forth by a hydraulic cylinder 37, and a lower holder 31 and a lower holder fixedly connected to the cylinder eject plate 36 by an eject rod 32. A lower mold (30) wrapped in (31), The upper mold part is wrapped in an upper holder 21 corresponding to the lower holder 31, a spring 22 formed between the upper holder 21 and the upper mold plate 24, and the upper holder 21. Including the upper side mold 20, The lower mold 30 is fixed to the lower template 34 in a slidable state with the lower holder 31, and the upper mold 20 is fixed to the lower template 24 in a slidable state to the upper holder 21. , The upper holder 21 and the upper template 24 are spaced a predetermined distance (b) is elastically supported by the spring 22, The hydraulic cylinder 37 advances the cylinder eject plate 36 and the lower holder 31 fixed to the cylinder eject plate at a predetermined interval back and forth by a predetermined interval. After film forming, the hydraulic cylinder 37 moves backwards at a predetermined interval to move the lower holder, and after injection molding, the hydraulic cylinder 37 pushes the lower holder while moving forward at a predetermined interval while the lower holder 31 and the lower mold 30 slide. Composite injection molding machine for a film insert, characterized in that the cutting of the film end. The method of claim 1, The lower holder (31) is formed on the film fixing pin (33), the upper holder (21) is a composite injection molding machine for a film insert, characterized in that the groove corresponding to the film fixing pin (33) is formed. delete

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