JP3133600B2 - Skin integrated molding die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus used for producing a multilayer molded article in which various skin materials are bonded to the surface of a core layer made of a thermoplastic resin, and is particularly suitable for interior materials for automobiles. The present invention relates to an applicable skin integral molding die.

[0002]

2. Description of the Related Art In general, for automobile interior parts, multilayer molded articles in which various skin materials are bonded to a surface of a base material made of a thermoplastic resin are frequently used. Then, a skin material is arranged between the opposing dies, the mold is clamped, and a molten synthetic resin is injected between the skin material and one of the dies to form by compression molding or the like.

[0003]

In a conventional mold, when the skin material is sandwiched between the molds and the molds are clamped, the height of the shear edge is constant. also in uneven height or depth location with a stop in the mold cavity, Ru Do <br/> to hold the skin material in the mold periphery at the same timing. For this reason, it is necessary to increase the extension of the skin material where there is a large difference in unevenness inside the mold, but since the sandwiching of the skin material is at the same timing, the extension length of the skin material is different, so In some cases, occurrence, epidermis, blurring, etc. may occur, and it has been difficult to sufficiently cope with the occurrence.

An object of the present invention is to provide a skin-integrated molding die capable of partially adjusting the tension of a skin material.

[0005]

SUMMARY OF THE INVENTION In a skin integral molding die according to the present invention, a cavity is formed by opposing dies, a skin material is arranged between the opposing dies, and the skin material and one of the cavities are formed. In a skin-integrated mold formed by injecting a molten resin between the molds and clamping the mold, by changing the height of the shear edge portion according to the location of the irregular shape or deep drawing of the mold,
It is characterized in that the clamping timing of the skin material is changed by clamping the mold.

[0006]

According to the present invention, a cap formed by opposing dies is provided.
Depending on the location where a stop irregularities or depth formed on the Activity to change the height of the shear edge, the clamp timing of the skin material by clamping the opposing mold shell
Since it is changed according to the change of the height of the edge, the time when the skin material is clamped at the time of mold clamping, where the unevenness of the mold is large, that is, where the development length of the skin material is long, To lower the mold closing timing than other parts and allow time for elongation of the epidermis. Conversely, where the development length of the skin material is small, the shear edge is increased and the skin material is fixed earlier. By the above configuration, by changing the allowable portion of the elongation of the skin material, even portions with a squeeze irregularities or depth of the mold Ru it can be similar to exhibition length ratio of the skin material.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is an explanatory sectional view, and FIG. 2 is a schematic perspective view of a movable mold shown in FIG. In the skin integral molding die S of this example, the fixed die 10 and the movable die 20 are arranged to face each other, and the fixed die 10 and the movable die 20 form a cavity K. Then, the skin material H is arranged between the fixed mold 10 and the movable mold 20, and the surface material H is melted between one of the fixed mold 10 and the movable mold 20. The mold is clamped by injecting resin.

The fixed-side mold 10 of this embodiment has a desired convex surface 11
The outer surface of the convex surface 11 is provided with a skin material holding frame (not shown). Then, the skin material H is held by the skin material holding frame. An extruder or an injection molding machine (not shown) is attached to the stationary mold 10 of the present embodiment, and a synthetic resin in a molten state is supplied from the extruder or the injection molding machine through a valve gate to the stationary mold. It is supplied on the convex surface 11 of the mold 10. The valve gate is provided with a gate pin operated by a valve operating cylinder. A skin material holding frame formed of a frame is attached to the fixed mold 10. The skin material H can be attached by vacuum suction or the like instead of the frame.

The movable mold 20 of this embodiment is located opposite to the fixed mold 10, and the inner surface of the concave mold surface 2 has a predetermined shape.
1, the concave mold surface 21 and the fixed mold 10
The cavity K is constituted by the convex surface 11.

Then, the height of the shear edge portion 30 is changed according to the concave / convex shape of the cavity K formed by the fixed mold 10 and the movable mold 20 or a portion 31 having a deep drawing. The clamping timing of the skin material H by clamping the molds 10 and 20 is changed. That is, in this example, as shown in FIG. 1, a shear edge portion 32 of the movable mold 20 having an extremely uneven shape or a deep drawn portion 31.
2 is formed thinner than the other shear edge portions 33 as shown in FIG. 2 to make the pulling of the skin material H non-uniform. With the configuration as in this example, it is easy to cope with the skin material H having extremely small elongation.

The material of the skin material H used in the present invention includes thermoplastic resin such as woven fabric, non-woven fabric, polyolefin, vinyl chloride and nylon, and thermoplastic elastomer such as polyolefin, polyester, urethane and vinyl chloride. Sheets and films. Further, the above materials may be used alone or as a laminate of two or more kinds as the skin material.

In order to give a softer feeling, a foam sheet made of polypropylene, polyethylene, urethane, etc. is bonded to the back of the skin material. The foam material is protected from the heat of the molten resin during molding. For the purpose of enhancing the adhesive strength, a laminate in which a cloth or a sheet or the like is stuck on the back surface can also be used. In using these skin materials, preheating may be performed prior to supply in order to adjust the tensile stress and elongation of the skin material.

The resin used as the base material in the present invention is, for example, polypropylene, polyethylene, polystyrene,
Thermoplastic resins such as acrylonitrile-styrene-butadiene copolymer and nylon, and thermoplastic elastomers such as ethylene-propylene block copolymer and styrene-butadiene block copolymer are commonly used for compression molding, injection molding and extrusion molding. Any of these can be used. In addition, those containing additives such as an inorganic filler, a filler pigment such as glass fiber, a lubricant, and an antistatic agent can be appropriately used.

Next, the operation of the skin integral molding die S having the above-described structure will be described. First, the skin integral molding die S
The skin material H is set in the movable mold 20 that constitutes one side of the above. Next, the movable mold 20 is moved in the direction of the fixed mold 10.
Is moved, and a molten synthetic resin serving as a base material is filled from the fixed mold 10 into the cavity K formed between the movable mold 20 and the fixed mold 10 through a valve gate. Then, the movable mold 20 is moved and the fixed mold 10 is moved.
To the skin material H held by the movable mold 20.
This prevents the high portion 33 of the shear edge 30 from being pinched earlier and being drawn further into the cavity K side.

When the movable mold 20 further moves, the skin material H is pressed against the surface of the cavity K in accordance with the supplied molten resin and the uneven shape of the cavity K. The skin material H located in the cavity K is drawn inward of the cavity K in accordance with the concave-convex shape of the cavity K or the shape with the deep drawing because the shear edge 32 is formed low. Then, after both the molds 10 and 20 are clamped, the skin material H
Is developed according to the shape of the cavity K. With such a configuration, the elongation of the skin material H can be adjusted regardless of the height difference of the shear edge 30 even at the portion 31 having irregularities and deep drawing, so that the elongation rate can be made uniform.

[0017]

[Effect of the Invention] In the present invention, the mold is formed by opposing dies.
That by changing the height of the shear edge portion in accordance with the locations of the diaphragm irregularities or depth is formed in the cavity, pairs
Since the clamping timing of the skin material by the mold clamping of the opposite mold is changed according to the change in the height of the shear edge, the time when the skin material is clamped at the time of mold clamping,
Where the unevenness of the cavity is large, that is, where the development length of the skin material is long, the shear edge is lowered to delay the mold clamping timing from other locations, and time is allowed to allow the skin to elongate. Conversely, where the development length of the skin material is small, the shear edge is increased and the skin material is fixed earlier.
By configuring as described above, it is possible to change the allowable portion of the elongation of the skin material, that is, to partially change and adjust the tension of the skin material, and it is possible to uniformly maintain the elongation rate of the skin material, The generation of wrinkles and the like can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of a skin integral molding die according to the present invention.

FIG. 2 is a schematic perspective view of the movable mold of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed-side mold 11 Convex surface 20 Movable-side mold 21 Concave mold surface 31 Deep drawing location 30, 32, 33 Share edge portion H Skin material K cavity S Skin integral molding die

Claims (1)

(57) [Claims] 1. A cavity is formed by an opposing mold, a skin material is disposed between the opposing molds, and a molten resin is injected between the skin material and one of the molds to clamp the mold. in integral skin molding die made, calibration is formed by a mold for the counter
The Activity, place is of form with a stop irregularities or depth
The height according to the irregularities or the location of the deep drawing.
The changed shear edge portion is formed, and the clamping timing of the skin material by the mold clamping of the opposing mold is high.
A skin-integrated molding die, which is formed so as to change according to the change.