JP2551368Y2 - Slash mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slush mold.

[0002]

2. Description of the Related Art Slash molding is a molding method frequently used in the manufacture of thin products such as a headrest skin of an automobile, an instrument panel skin, and the like, and is performed as follows. That is, a sol-like paste such as a vinyl chloride resin called a plastisol is poured into a heated slush mold, and the sol adhered in a layer on the inner surface of the mold is gelled by the heat of the mold surface, and then a film is formed from the mold surface. This is a method of obtaining a desired slush molded product by peeling the molded product. As the slush molding, there is a powder slush molding using a resin powder instead of the sol paste.

However, when the molded product is peeled off from the mold surface, the molded product is thin and soft, and the mold surface is still in a high temperature state. There was a danger of burns.

In recent years, as shown in FIG.
An opening 14 for blowing air into the outside of the mold is provided, and when the molded product 12 is peeled off from the mold surface, air is supplied to the opening 14 from outside the mold to form the molded product 12 on the mold surface and the mold surface 10.
A slush molding die 16 has been proposed in which the air is blown in between to automatically remove the molded product 12 from the mold surface 10 by the air (actually, 3-40).
575).

However, the slash molding die 16 has the following problems since the air blowing opening 14 on the die surface is always open. Since the plastisol injected into the slush mold is liquid, and most of the resin powder has a very small particle size of 20 to 100 microns, the resin enters the air blowing opening on the mold surface before gelling. Was inevitable. Therefore, the resin that has entered the opening for air blowing is gelled in the opening or the pipe following the opening due to the heat held by the mold,
Openings and piping may be blocked. In addition, there is a possibility that the amount of air supplied becomes smaller gradually due to the resin attached to the opening or the inner wall of the pipe.

On the other hand, in order to prevent the resin from entering the opening, air is gradually discharged from the opening into the mold from the time when the plastisol or the resin powder is charged into the mold until the molded product is released from the mold. Is also the above-mentioned actual fair 3-405
No. 75, which proposes that air is trapped in a raw material resin such as plastisol to form a void (cavity) in a molded product, or to form a gap between a gelled resin and a mold surface to form a mold surface. There is a disadvantage that the transfer of the squeezed pattern becomes insufficient.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a slush molding die in which a raw material resin does not enter an air blowing opening of a die surface.

[0008]

Means for Solving the Problems To achieve the above object, the present invention provides a slash molding die having an opening for air blowing leading to the outside of the die on a mold surface, wherein a valve is provided at the opening. When no air is supplied, the valve closes the opening, and when air is supplied from outside the mold to the opening, the valve is opened to blow air into the mold.

[0009]

In the slush molding mold, the supply of air is stopped and the air blowing opening on the mold surface is closed with a valve from the time when the raw material resin such as plastisol is charged into the mold to before the mold is released from the mold. This prevents the raw material resin in the mold from entering the air blowing opening. Also, at the time of demolding of the molded product formed on the mold surface and the opening, when supplying air to the air blowing opening from outside the mold,
The valve at the opening is opened, and air is blown into the mold from the opening. As a result, air is blown between the molded product and the mold surface which has been stuck to the mold surface, and the molded product is automatically peeled off from the mold surface.

The exposed surface in the mold of the valve is provided so as to form a single surface with the mold surface without any step or the like with respect to the surrounding mold surface, since the design of the molded product is not restricted. Preferred. In addition, it is preferable that the position of the air blowing opening is a mold surface for molding a portion that becomes an unnecessary portion of the molded product, since there is no risk of impairing the appearance of the molded product.

[0011]

Embodiments of the present invention will be described below. FIG.
FIG. 2 is a cross-sectional view of the slash molding die according to the embodiment of the present invention, showing a state in which an air blowing opening is closed. FIG. 2 is an enlarged cross-sectional view of a portion A in FIG. FIG. 4 is a sectional view showing an opened state, and FIG. 4 is a sectional view of a portion B in FIG.

The slash forming die 18 has an air blowing opening 22 formed in a part of the die surface 20 in a hole shape. A required number of air blowing openings 22 are provided at predetermined positions on the mold surface, and are connected to an air supply device (not shown) outside the mold by a pipe 24 via an opening / closing device 26. It is preferable that the position of the air blowing opening 22 is a mold surface that forms an unnecessary portion of the molded product. For example, if a mold surface for forming the meter opening in the skin of the instrument panel or a mold surface for forming a part other than the product part is used, the surface condition of the meter opening is impaired even if the air opening 22 exists. However, the appearance of the product is not impaired because the portion is cut off later or is concealed when the product is assembled. In the figure, the range of C of the mold surface 20 is a mold surface that forms a part finally obtained as a product in the molded product. A pattern such as a squeezed pattern is formed on the mold surface 20 as necessary.

A valve 25 for opening and closing the air blowing opening 22 is attached to the air blowing opening 22 together with an opening / closing device 26. The valve 25 has a plug or lid shape made of resin or metal having a size to close the hole of the opening 22. The exposed surface in the mold of the valve 25 is the surrounding mold surface 2.
It is preferable to provide the mold surface 20 so as to form a single surface with the mold surface 20 with no step or the like with respect to 0 so as not to restrict the design of the molded product. On the other hand, the opening / closing device 26 is a slide rod which can be moved forward and backward by a spring 30 in a cylindrical case 28 having one end communicating with the pipe 24 outside the mold and the other end communicating with the opening 22. 32, the valve 25 is fixed to the tip of the slide bar 32, and the other end is provided with a plate-shaped body 34 for supporting the spring 30 and receiving air, and operates as follows.

When air is not supplied to the air blowing opening 22, the slide rod 32 is pushed by the spring 30 toward the outside of the mold (in a direction away from the mold) in the case 28, and the valve 25 at the tip of the slide rod 32 is moved. Is opening 2
Cover 2 On the other hand, when air is supplied to the air blowing opening 22, the air is supplied to the slide bar 3.
The plate 34 is pushed inward in the mold by hitting the plate 34 at the two ends, and the slide bar 32 connected to the plate 34 advances in the mold. Then, the valve 25 at the tip of the slide rod 32 projects into the mold from the opening 22 to open the opening 22. As a result, air that has passed through the case 28 of the opening / closing device 26 is blown into the mold from the opening 22.

Next, slush molding using the slush molding die 18 will be described. First, a raw resin made of plastisol or resin powder is put into the heated slush molding die 18, the raw resin is adhered to the die surface 20, and gelled by the retained heat of the die surface. Then, the slash molding die is inverted to discharge excess raw material resin from the die, and the gelation is completed. Upon completion of the gelation, a film-shaped molded product 36 is formed on the mold surface 20 and the air blowing opening 22 in a state of being stuck. During this time, the supply of air to the air blowing opening 22 is stopped, and the opening 22 is closed with the valve 25 to prevent the raw resin from entering the opening 22. Thereafter, air is supplied to the opening 22 through the pipe 24. The opening / closing device 26 is operated by the air to advance the valve 25 into the mold, and the opening 22 is opened. Then, the air blown into the mold from the opened opening 22 is blown between the mold surface 20 and the molded product 36 stuck to the mold surface 20, and the molded product 36 is automatically discharged from the mold surface 20. Peeling gives a desired slush molded product. The compressed air is usually used as the air, but may be a gas other than the air.

[0016]

Since the slush molding die of the present invention has the above-described structure, the raw resin does not enter the opening for air blowing during the slush molding, and there is no possibility that the opening is clogged. In addition, since air is not blown into the mold from the time of input of the raw material resin to the demolding of the molded product, voids are formed in the molded product due to the entrainment of air, and the transfer of the pattern on the mold surface becomes poor. Not even.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which an air blowing opening is closed in a slash molding die according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

FIG. 3 is a cross-sectional view of the slash mold according to the embodiment of the present invention, showing a state in which an air blowing opening is opened.

FIG. 4 is an enlarged sectional view of a portion B in FIG. 3;

FIG. 5 is a sectional view of a conventional slush mold.

[Explanation of symbols]

 18 Slash molding die according to one embodiment of the present invention 20 Mold surface 22 Air blowing opening 25 Valve

Claims (3)

(57) [Scope of request for utility model registration] In a slash molding die provided with an opening for air blowing leading to the outside of the die on a die surface, an exposed surface in a die of a valve provided on the opening forms one surface with the die surface, Wherein the valve is closed by the valve when air is not supplied, and the air is blown into the mold by opening the valve when air is supplied from outside the mold to the opening. 2. The slush molding die according to claim 1, wherein the air blowing opening is located on a die surface forming an unnecessary part of the molded product. 3. A slash molding die provided with an opening for air blowing leading to the outside of the mold on the mold surface, wherein a valve is provided in the opening, and the valve is closed with the valve when air is not supplied. A slush molding die, characterized in that a valve is opened to supply air to the opening to blow air into the mold, and that the opening for air blowing is located on the mold surface for molding unnecessary parts of the molded product. .