JPH05200793A - Mold and manufacture of in-mold transfer board - Google Patents

Abstract

PURPOSE:To obtain an in-mold transfer board that can be manufactured by an easy process and has excellent appearances by slowing problems in which a process in conventional fabrication or the like is complicated, or in the case of a molding, defects of burnings, sinks and the like occur in a manufacture of the in-mold transfer board of a refrigerator door, and in molds. CONSTITUTION:On the circumference of a gate 9 of the other mold 8, a radiator 10 is disposed which comprises an alloy of copper-beryllium with good thermal conductivity so that the temperature of molten synthetic resin 14 to be injected into mold from the gate 9 is diffusion-cooled by the radiator 10. Thus, the occurrence of defects of burnings, sinks and the like, and the peeling of a pattern layer from the resin molding can be prevented, thereby obtaining a good refrigerator door of large size and with beautiful appearances.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a molding die including one die for in-mold molding using a transfer film and the other die, and a refrigerator using the molding die. The present invention relates to a method for manufacturing an in-mold transfer plate for forming a large-sized front door used in a freezer, a refrigerator, etc., and particularly, a front door formed by integral molding of a synthetic resin having a pattern or letters printed on its surface.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for large-capacity refrigerators for household refrigerators and the like, as their storage capacities have increased. Also, due to the sophistication of houses, the diversification of housing equipment and furniture, or the orientation toward living comfortably, so-called electric appliances such as refrigerators are not only required to have simple functions, but also as a part of furniture or as an ornament. The voice that wants the added value of is increasing recently.

On the other hand, conventional electric refrigerators have been developed in terms of efficient refrigeration or freezing, and it is difficult to provide the above-mentioned added value due to their uniform shape. It was Further, in the case of a large-sized refrigerator having a large capacity, its front door has a large number of components as shown in FIG. 4, that is, an iron plate such as a panel 1, a cap 2, a seal foam 3, an aluminum tape 4, a sash 5 and a handle 6. It was constructed by manufacturing resin frames separately and assembling them.

[0004]

However, the above-mentioned conventional front door structure and manufacturing method have a problem that the steps are complicated and the cost is increased. An attempt was also made to manufacture this front door by integrally molding a resin material, but in the case of a large molded product such as the front door of a refrigerator, in order to inject and fill the molten resin material up to the periphery of the mold. However, since the temperature of the synthetic resin material must be raised to a high temperature, there is a problem that a cause of defects such as burns and sink marks peculiar to the injection molding of the resin occurs. In order to solve this problem, measures such as providing gates at two places and cooling the lower mold of the mold were taken, but in this method, a phenomenon called so-called weld, which is a wrinkle caused by overlapping molten synthetic resins Or a new problem such as peeling of the transfer film in the case of in-mold molding, and the conventional refrigerator front door uses the metal such as the iron plate as described above, so the refrigerator body There was a problem that grounding had to be done via the.

The present invention is intended to solve the above problems,
It provides a method of manufacturing an in-mold transfer plate for a front door for manufacturing a refrigerator that expands the degree of freedom in designing the front door, and thus has excellent decorativeness and can also provide added value as furniture. In addition, it is an object of the present invention to provide a molding die that enables the manufacturing method.

[0006]

In order to achieve the above object, the present invention provides a molding die comprising one die and the other die used for in-mold molding using a transfer film, wherein the other die Copper with excellent thermal conductivity is applied to the gate part that injects the molten synthetic resin in the center of the mold.
A heat radiator made of beryllium alloy or the like is arranged, and a transfer film is set between at least two opposite molds in a non-holding state between one mold of the mold and the other mold. Step, fitting the other mold to one mold, injecting molten synthetic resin from the gate of the other mold into the cavity in the mold, and cooling the molding mold And the step of taking out the in-mold transfer plate.

[0007]

Therefore, according to the present invention, since the radiator made of copper-beryllium alloy or the like having excellent thermal conductivity is arranged around the gate in the center of the other mold, the injection molding machine The high heat of the synthetic resin melted to a high temperature injected from the nozzle is cooled in the gate part, and the temperature rise due to the high pressure in the nozzle part is prevented, so that the transfer film is not locally exposed to a high temperature, and the resin molding It is possible to prevent the peeling of the transfer film from the sheet and the occurrence of defects such as sink marks and burns.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 (a), 1 (b) and 1 (c) show a molding die in one embodiment of the present invention and a method for manufacturing an in-mold transfer plate such as a door for a refrigerator using the molding die. Shows enlarged main parts of the molding die in the manufacturing method. In the figure, 7 is a recess 7
One mold having a, 8 is a gate 9 at approximately the center thereof.
Is provided, and is the other mold in which the convex portion 8a is formed along the concave portion 7a of the mold 7. A heat radiator 10 made of a metal having excellent thermal conductivity such as a copper-beryllium alloy is arranged around the gate 9 of the mold 8. The surface of the radiator 10 is provided on the same plane as the surface of the convex portion 8a. Reference numeral 11 is a transfer film provided with a pattern layer 12 printed thereon, and reference numeral 13 is the tip of an injection molding machine (not shown) in which ABS, A melted by being heated to a high temperature.
A nozzle for injecting the synthetic resin 14 such as S or polypropylene into the mold, 15 a screw for pressurizing and injecting the synthetic resin 14, and 16 an in-molded resin molding.

Next, a method of manufacturing the above structure will be described. First, the transfer film 11 on which the pattern layer 12 is printed is positioned and set in one mold 7 (a), and then the other mold 8 is moved to sandwich the transfer film 11 and hold the transfer film 11. The convex portion 8a of the other die 8 fits into the concave portion 7a of the die 7. After that, the nozzle 13 moves to come into close contact with the entrance of the gate 9 of the other mold 8, and the molten synthetic resin 14 is injected into the mold (b). Next, two molds 7,
8 is cooled to solidify the synthetic resin 14 inside, and one mold 7 and the other mold 8 are separated and solidified resin molding 1
The refrigerator door 17 having the pattern layer 12 transferred to the surface of 6 is taken out (c).

Next, the features of the present invention regarding the above-mentioned manufacturing method of the present invention will be described in more detail with reference to FIG. FIG. 2 is an enlarged view of the main part of FIG. 1B, in which 18 is a heater for heating and retaining the temperature of the molten synthetic resin 14, which is provided around the resin passage 8b of the mold 8. ing. The temperature of the synthetic resin 14 in the resin passage 8b is about 220.
It is about ℃. Therefore, when the radiator 9 is not provided in the vicinity of the gate 9 of the other mold 8 as in the conventional case, the temperature in the vicinity of the gate 9 reaches 100 to 150 [deg.] C. Therefore, the finished product has a defect such as a burn or a sink mark. Will occur. On the other hand, in this embodiment, the radiator 1
Since 0 is provided around the gate 9, the temperature near the gate 9 is dissipated by the radiator 10, and the temperature is 60 to
The temperature is lowered to 70 ° C., defects such as burns and sink marks are not generated, and the phenomenon that the pattern layer 12 is peeled from the resin molded body 16 is also eliminated.

FIG. 3 shows the refrigerator door 17 in which the pattern layer 12 manufactured by the manufacturing method of this embodiment is transferred and integrally molded on the upper surface of the resin molded body 16, and FIG. It is possible to easily manufacture a large number of parts and a metal material such as an iron plate by integral molding without assembling them in a complicated process like the conventional refrigerator door shown in FIG.

In this embodiment, the gate 9 is cooled by natural heat dissipation of the radiator 10. The cooling degree depends on the size and shape of the mold used and the synthetic resin 14 injected into the mold. Of the transfer film 11 or the type of the transfer film 11, etc., and it is necessary to adjust the optimum conditions. Therefore, the degree of heat radiation can be adjusted by changing the installation position and shape of the heat radiator 10 around the gate 9, and a cooling pipe is embedded in the heat radiator 10 for accurate control. Is also possible.

Thus, according to the above embodiment, the gate 9
Since the radiator 10 is provided around the mold, the temperature of the high-temperature molten synthetic resin 14 injected into the mold can be lowered, and an excellent large-sized refrigerator door without defects is manufactured by integral molding. be able to.

Further, since the manufactured refrigerator door is made of an insulating material such as synthetic resin, it is not necessary to ground it.

[0015]

As is apparent from the above-described embodiments, the present invention is a molding die in which a heat radiator made of copper-beryllium alloy or the like having excellent thermal conductivity is arranged in the gate portion in the substantially central portion of the die. It is a mold, and the transfer film is set in the mold using the mold, and when the molten synthetic resin from the gate is injected into the mold, the temperature around the gate is lowered by allowing the temperature to dissipate from the radiator. Because it is a manufacturing method that includes the step of, it is possible to prevent the occurrence of defects such as burns and sinks, and the excellent large-sized refrigerator door, etc. that does not cause the pattern layer to peel off from the resin molded body. An in-mold transfer plate can be manufactured.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a mold open state showing a method for manufacturing an in-mold transfer plate according to an embodiment of the present invention. FIG. 1B is a mold fitted state (a resin is injected into a mold). (C) is a sectional view of the refrigerator door (in-mold transfer plate) taken out with the mold opened.

FIG. 2 is a sectional view showing a main part of a molding die according to the embodiment.

FIG. 3 is a perspective view of a refrigerator door manufactured by the manufacturing method.

FIG. 4 is an assembled perspective view of a refrigerator door in a conventional manufacturing method.

[Explanation of symbols]

 7 One mold (mold) 8 The other mold (mold) 9 Gate 10 Heat radiator 11 Transfer film 14 Synthetic resin

Claims (2)

[Claims] 1. In a molding die comprising one die and the other die used for in-mold molding using a transfer film, a molten synthetic resin in a substantially central portion of the other die is injected. Copper with excellent thermal conductivity at the gate
Molding die with heat radiator made of beryllium alloy. 2. A transfer film at least facing each other between one mold and the other mold of the molding mold according to claim 1.
A step of setting the side in a non-holding state, a step of fitting the other mold to one mold, and a step of injecting a molten synthetic resin from a gate of the other mold into a cavity in the mold. And a step of cooling the molding die to take out the in-mold transfer plate.