KR101113059B1 - Mold and method for injection molding - Google Patents

Abstract

PURPOSE: An injection mold and an injection molding method are provided to prevent the tearing of a decoration film by securing a margin length of the decoration film so that the decoration film is transformed corresponding to the shapes of first and second molds. CONSTITUTION: An injection mold comprises first and third molds(10,30). The first mold comprises a first film fixing part(11) and a film lifting part(15). The film lifting part is installed on the inner side of the first film fixing part and can vary the protruding length thereof. The third mold is meshed with the first mold after a decoration film(40) is set in the first mold and presses the decoration film with a second film fixing part cooperating with the first film fixing part. The film lifting part protrudes when the decoration film is pressed by the first and second film fixing parts and retracts after fixing the decoration film.

Description

Injection Mold and Injection Molding

The present invention relates to an injection mold and an injection molding method, and more particularly, to an injection mold and an injection molding method for producing a molded article that is injection molded with the film so that the decorative film is attached to the surface.

Injection molded products are used to make not only electrical and electronic products such as mobile phones but also automobiles and household goods. Injection molded products are manufactured by melting a synthetic resin material and injecting it into a mold to harden it. After manufacturing, the outer surface is processed in the form of painting, attaching a decorative film printed with a pattern, or transferring a pattern from a decorative film. However, in order to attach a decorative film or to transfer a pattern from the attached film, a decorative film must be attached to the outer surface. In recent electric and electronic products that have been miniaturized and thinned, the decorative film was previously placed in an injection mold and a synthetic resin was molded. Injecting into a mold has been frequently used to attach a decorative film simultaneously with injection molding.

However, in recent years, various electrical and electronic products are designed with an emphasis on design, so that injection molding together with a decorative film is often difficult depending on the shape thereof.

For example, a product such as FIG. 1 is an injection molded article for a very thin cell phone case, and a mold such as FIG. 2 is used to inject such a product. Figure 3 shows a decorative film to be inserted by the mold of Figure 2, usually such a decorative film uses a synthetic resin film having a thickness of about 5 ~ 500 ㎛, the decorative film is decorated with decorations such as letters or geometric shapes The decorative layer is provided on the film layer. The decorative layer is formed by gravure printing, screen printing, offset printing, etc., and in some cases, the decorative layer may further include a metal film by vapor deposition, ion plating, or the like. In addition, the decorative layer may further include an adhesive layer to remove the film after injection molding and leave only the decoration.

4 and 5 illustrate a step of injection molding with such a decorative film. First, the decorative film 40 is fixed to a predetermined position of the first mold 10. (FIG. 4, FIG. 5 (a)) In order to fix the decorative film 40, the first mold 10 may be formed of rubber or the like. A packing part 110 made of a flexible material and a plurality of suction parts 12 for generating a negative pressure to fix the decorative film to the first mold are provided. The decorative film 40 is first attached to a predetermined position of the first mold 10 by the negative pressure of the suction unit 12 (FIG. 4), and then pressurized by the third mold 30 and the packing unit 110. 5 (a)) The decorative film 40 fixed by the negative pressure of the suction part 12 can accurately adjust its position while moving little by little by hand or the like. When the third mold 40 and the packing part 110 are fixed by the pressure, the decorative film 40 no longer changes its position.

Next, as the second mold 20 is combined with the first mold 10, the decorative film 40 is pressed by the second mold 20. (FIG. 5 (b)) The first mold 10 ) And the second mold 20 are combined, then the synthetic resin is injected through the injection hole 22 between the decorative film 40 and the second mold 20. (FIG. 5 (c)) Accordingly, the decorative film 40 ) Is completely pressed toward the first mold 10 and the injection molded article is completed while the synthetic resin between the decorative film 40 and the second mold 20 is hardened. Thereafter, a work is performed to separate the injection molded products from the first, second, and third molds, and the first and second molds have a configuration to play such a role, but this is general in the field of injection molding. Omit.

When manufacturing the injection molded article as described above, when the second mold 20 and the first mold 10 are combined, the decorative film 40 is elongated in a large amount at the portion indicated by the arrow of FIG. To be required. When the elongation of the decorative film is low, the decorative film may be torn or the printed decorative layer of the decorative film may be cracked. To prevent this, the decorative film is heated or a high elongation film is used. However, it is not only difficult to uniformly heat the decorative film, but also to manufacture an ultra-thin injection molded article, there are various restrictions in design and production, such as the use of a thin film and high elongation.

The present invention has been made to solve the above problems, to provide an injection mold and an injection molding method that can produce an injection molded article in which the decorative film is not torn during the injection mold, or the printed layer of the decorative film is damaged. The purpose.

Injection mold of the present invention
Between the first mold to which the decorative film is mounted, the third mold for fixing the decorative film mounted on the first mold, and the decorative film and the second mold whose positions are fixed by the first mold and the third mold. In the injection mold comprising a second mold coupled to the first mold for injecting the synthetic resin material,

The first mold has a first film fixing part at an edge, and is provided inwardly from the first film fixing part and has a film rising part which can control whether the protrusion is made;

The third mold has a second film fixing part for fixing the decorative film together with the first film fixing part by mounting the decorative film on the first mold and then combining with the first mold;

The film rising part protrudes when the film is fixed by the first film fixing part and the second film fixing part, and retreats after the pressure fixing part;

When the first and second molds are combined by the allowable length of the decorative film secured when the film is raised, the decorative film is deformed in an undamaged state corresponding to the shape of the first and second molds.

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In addition, the injection mold of the present invention preferably further comprises an adsorption unit capable of adsorbing the decorative film.

Another injection mold of the present invention
A first film fixing part installed at an edge, a film rising part which is installed inwardly than the first film fixing part, and which can adjust the protruding part, and an adsorption part which can adsorb the decorative film, and which is decorated with the decorative film. 1 mold;

And a second film fixing part for fixing the decorative film in cooperation with the first film fixing part, and having a second mold which is combined with the first mold and allows a synthetic resin material to be injected onto the decorative film mounted on the first mold. To;

The film rising part protrudes and then retracts after adsorbing the decorative film to the first mold;

When the first and second molds are combined by the allowable length of the decorative film secured when the film is raised, the decorative film is deformed in an undamaged state corresponding to the shape of the first and second molds.

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Injection molding method of the present invention
A first mold having a first film fixing part installed at an edge, a film rising part installed inwardly from the first film fixing part and controlling a protruding part, and having a decorative film mounted thereon; A third mold coupled to the first mold and having a second film fixing portion for cooperatively fixing the decorative film in cooperation with the first film fixing portion when combined; Providing an injection mold coupled to the first mold, the injection mold comprising a second mold for injecting a synthetic resin material onto the decorative film mounted on the first mold;

Protruding the film lifter of the first mold and then mounting the decorative film;

Combining the first mold with the third mold to press fix the decorative film between the first film fixing part of the first mold and the second film fixing part of the third mold;

Retracting the film riser;

Combining the first and second molds while preventing the decorative film from being damaged in correspondence with the shapes of the first and second molds by the allowable length of the decorative film secured when the film riser protrudes;

And injecting a synthetic resin material between the decorative film placed on the first mold and the second mold.

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Another injection molding method of the present invention
A first film fixing part installed at an edge, a film rising part which is installed inwardly than the first film fixing part, and which can adjust the protruding part, and an adsorption part which can adsorb the decorative film, and which is decorated with the decorative film. 1 mold; A second film fixing part for fixing a decorative film in cooperation with the first film fixing part, and coupled to the first mold, includes a second mold for injecting a synthetic resin material onto the decorative film mounted on the first mold. Comprising the injection mold made;

Protruding the film rising part of the first mold and then adsorbing by adjusting the position of the decorative film by the adsorption part;

Retracting the film riser;

The decorative film is fixed by the first film fixing part of the first mold and the second film fixing part of the second mold, and the decorative film is formed by the allowable length of the decorative film secured when the film is raised. Combining the first and second molds while not being damaged in correspondence with the shape of the first and second molds;

And injecting a synthetic resin material between the decorative film placed on the first mold and the second mold.

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According to the injection mold and the injection molding method of the present invention, it is possible to produce an injection molded article in which the decorative film is not torn during the injection molding or the printed layer of the decorative film is not damaged.

1 is a view showing the form of an injection molded article for a mobile phone case.
Figure 2 is a view showing the form of a conventional injection mold.
Figure 3 is a view showing the form of a decorative film for producing the injection molded article of Figure 1;
4 and 5 show a conventional injection molding method.
6 is a view showing a first mold of an embodiment of the present invention.
7 is a view showing the operation relationship of the film riser of the present invention.
8 is a view showing each embodiment of the film riser of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 6, the present invention further includes a film rising part 15 that can control whether the first mold 10 protrudes in contrast to the conventional injection mold of FIG. 4.

The film rising part 15 may protrude to locally elevate the decorative film 40 from the first mold 10, and may be inserted into the first mold again so that there is no protruding portion. Whether the film rise 15 is projected or not can be controlled mechanically or by the air pressure. In addition, it is preferable that the height of the protrusion can also be adjusted, but since the height of the protrusion can be fixed when the type of decorative film to be used is determined, it is also possible to protrude only a certain height.

As shown in FIG. 7A, the decorative film 40 is locally raised by the film rising part 15 to be mounted on the first mold 10.

When the first mold 10 is mounted on the decorative film 40, it is preferable to adjust the mounting position of the decorative film 40 to be temporarily fixed by the adsorption part 12 installed on the first mold 10. In the case where the alignment relationship between the first mold 10 and the decorative film supply unit (not shown) is very precise, the adsorbing unit may not be provided.

The decorative film mounted on the first mold 10 is sandwiched between the first film fixing part 11 of the first mold 10 and the second film fixing part 21 of the third mold to completely fix its position. . In this embodiment, the first film fixing part 11 is made of a flexible material, such as the packing portion of the prior art described above, and the second film fixing part 21 is shown to be the lower surface of the third mold 30. However, it may be formed opposite to each other, and both the first and second film fixing parts may be formed as packing parts, or one may be formed as concave parts.

As described above, the decorative film 40 mounted so as to locally rise by the film rising part 15 may have a film rising part (a process of before or when the second mold 20 is coupled to the first mold 10. When 15) enters into the first mold 10 and there is no protruding part (see FIG. 7 (b)), it has a certain amount of allowable length and can be deformed without difficulty in correspondence with the shapes of the first and second molds. The printed layer will not be damaged. Then, when the synthetic resin is injected between the decorative film 40 and the second mold 20 mounted on the first mold 10, injection molding is completed.

In the above embodiment, a third mold having a second film fixing part is used to fix the decorative film. However, a second mold fixing part is not required without the third mold through the second embodiment of the present invention. It is also possible to carry out injection molding.

That is, after protruding the film rising part, the position of the decorative film is temporarily fixed by the adsorption part, and then the film rising part is retracted. At this time, since the adsorption part temporarily fixes the position of the decorative film, the positional change of the decorative film does not occur.

Subsequently, the decorative film is fixed by the second film fixing part provided on the bottom edge of the second mold and the first film fixing part of the first mold, and the decorative film secures the clearance length by the protrusion of the film rising part. Corresponding to the shape of the first and second molds, it can be deformed without difficulty, so that it is not torn or damaged. Then, injection molding is completed by injecting a synthetic resin material between the decorative film placed on the first mold and the second mold.

In detail according to the description of each embodiment, the film riser secures the free length of the decorative film before the bonding of the first and second molds, and reduces the amount of protrusion immediately before or during the bonding process, thereby reducing the first, It is a technical idea of the present invention to allow a decorative film to be deformed corresponding to the shape of a two-mould.

An example to implement this is as follows. However, of course, the film rise portion is not limited to the following embodiments.

The film rising part inserts the film contact part 151 into the 1st metal mold | die 10 as shown in FIG. 8 (a), and the stopper part 152 and the film contact part 151 which can adjust the height of the film contact part 151 are provided. It may also be configured as a spring 153 that can be kept protruding. Of course, in this case, the elasticity of the spring 153 may be maintained by raising the decorative film 40, and when contacted with the second mold 20, the film contact part 151 may be retracted and the second mold 20 and the film contact part 151 may be retained. Of course, it should be within the range that the decorative film 40 between the sliding and displaced. The stopper 152 may be used to select an optimal protrusion amount by adjusting the protrusion amount when the thickness of the decorative film is changed or the shape of the mold is modified in addition to supporting the spring 153.

When the height of the film rising part is determined, the film contact part rises by the hydraulic pressure or pneumatic pressure supplied by inserting the film contact part 151 into the first mold 10 as shown in FIG. It is also possible to allow the contact portion to be lowered, as shown in FIG. 7 may be directly connected to the cylinder 154 to adjust the raising and lowering of the film riser (15).

In addition, the film rising portion may be provided in various forms at various locations according to the shape of the injection molded article.

Reference Signs List 10 first mold 11 first film fixing part 12 suction part
15 film riser 151 film contact 152 stopper
153: spring
20: second mold 21: second film fixing part 30: third mold
40: decorative film 110: packing part

Claims (6)

Between the first mold to which the decorative film is mounted, the third mold for fixing the decorative film mounted on the first mold, and the decorative film and the second mold whose positions are fixed by the first mold and the third mold. In the injection mold comprising a second mold coupled to the first mold for injecting the synthetic resin material,

The first mold has a first film fixing part at an edge, and is provided inwardly from the first film fixing part and has a film rising part which can control whether the protrusion is made;

The third mold has a second film fixing part for fixing the decorative film together with the first film fixing part by mounting the decorative film on the first mold and then combining with the first mold;

The film rising part protrudes when the film is fixed by the first film fixing part and the second film fixing part, and retreats after the pressure fixing part;

When the first and second molds are combined by the allowable length of the decorative film secured by the protrusion of the film riser, the decoration film is deformed in an undamaged state corresponding to the shape of the first and second molds. mold.
The method of claim 1,
Injection mold characterized in that it further comprises an adsorption unit capable of adsorbing the decorative film.
A first film fixing part installed at an edge, a film rising part which is installed inwardly than the first film fixing part, and which can adjust the protruding part, and an adsorption part which can adsorb the decorative film, and which is decorated with the decorative film. 1 mold;

And a second film fixing part for fixing the decorative film in cooperation with the first film fixing part, and having a second mold which is combined with the first mold and allows a synthetic resin material to be injected onto the decorative film mounted on the first mold. To;

The film rising part protrudes and then retracts after adsorbing the decorative film to the first mold;

When the first and second molds are combined by the allowable length of the decorative film secured by the protrusion of the film riser, the decoration film is deformed in an undamaged state corresponding to the shape of the first and second molds. mold.
A first mold having a first film fixing part installed at an edge, a film rising part installed inwardly from the first film fixing part and controlling a protruding part, and having a decorative film mounted thereon; A third mold coupled to the first mold and having a second film fixing portion for cooperatively fixing the decorative film in cooperation with the first film fixing portion when combined; Providing an injection mold coupled to the first mold, the injection mold comprising a second mold for injecting a synthetic resin material onto the decorative film mounted on the first mold;

Protruding the film lifter of the first mold and then mounting the decorative film;

Combining the first mold with the third mold to press fix the decorative film between the first film fixing part of the first mold and the second film fixing part of the third mold;

Retracting the film riser;

Combining the first and second molds while preventing the decorative film from being damaged in correspondence with the shapes of the first and second molds by the allowable length of the decorative film secured when the film riser protrudes;

Injection molding method comprising the step of injecting a synthetic resin material between the decorative film placed on the first mold and the second mold.
The method of claim 4, wherein
The step of mounting the decorative film after protruding the film riser of the first mold is injection molding method, characterized in that further comprising the step of adjusting the position of the decorative film by the adsorption unit for adsorption.
A first film fixing part installed at an edge, a film rising part which is installed inwardly than the first film fixing part, and which can adjust the protruding part, and an adsorption part which can adsorb the decorative film, and which is decorated with the decorative film. 1 mold; A second film fixing part for fixing a decorative film in cooperation with the first film fixing part, and coupled to the first mold, includes a second mold for injecting a synthetic resin material onto the decorative film mounted on the first mold. Comprising the injection mold made;

Protruding the film rising part of the first mold and then adsorbing by adjusting the position of the decorative film by the adsorption part;

Retracting the film riser;

The decorative film is fixed by the first film fixing part of the first mold and the second film fixing part of the second mold, and the decorative film is formed by the allowable length of the decorative film secured when the film is raised. Combining the first and second molds while not being damaged in correspondence with the shape of the first and second molds;

Injection molding method comprising the step of injecting a synthetic resin material between the decorative film placed on the first mold and the second mold.

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