JPH07195431A - Method of molding base material with partial decoration - Google Patents

Abstract

PURPOSE:To perform the integral molding of partial adhesion without the necessity of a post process by permitting a movable mold disposed with skin material to be moved in use of plurality of movable molds and stationary mold, injecting molten resin to be molded and, after that, by molding molten resin injected in the same manner into a movable mold having no skin material provided thereon at delayed timing. CONSTITUTION:A partial skin material H is attached on a core movable mold 20, and the core movable mold 20 is moved and shifted to the side of an opposite stationary mold 10, and then molten resin is injected into a cavity from a gate 11a being opposite to the core movable mold 20 for forming a partial skin material H and base material. Next, at timing delayed further than that process, a main movable mold 30 is moved. Also, at this time, molten resin is injected from the gate 11a of the stationary mold 10 being opposite to the main movable mold 30 to then be subjected to a mold clamping and pressing process. This timing is carried out by a valve gate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partially decorating a base material, which is partially decorated on the surface of a base material made of a thermoplastic resin.

[0002]

2. Description of the Related Art Generally, for automobile interior parts, multi-layer molded articles in which various skin materials are attached to the surface of a base material made of a thermoplastic resin are often used. This multi-layer molded product is formed by arranging a skin material between opposing molds and clamping the mold, and by injecting a molten synthetic resin between the skin material and one of the molds by compression molding or the like. There is. Then, depending on the vehicle, there is a vehicle in which a fabric or the like is partially joined to a part of the base material and is partially decorated.

[0003]

Conventionally, in order to decorate a part of the above-mentioned base material by partially bonding the skin material, the skin material may be partially adhered with an adhesive or a separate process may be performed. It was decorated by assembling a separate molded product molded in.

However, it is difficult to integrally bond the partial skin material to the base material in a separate process. In addition, if a base material is formed in advance and a partial skin material that is a separate skin material or a separate molded product is bonded to this base material, the bonding process is complicated and troublesome, and there is a disadvantage that the processing cost increases. In particular, the base material after molding had irregularities in the shape of a product, and it took a lot of time and effort to bond the base material, and the work efficiency was significantly impaired.

An object of the present invention is to partially bond a fabric or the like in an interior molded product such as a door trim,
Partial decorative molding of the base material, which has improved bonding strength without the need for post-processing to reduce costs by simultaneously performing the base material molding in the molding process and reducing the process, and eliminating the adhesive. To provide a method.

[0006]

A method for partially decorating a base material according to the present invention is a method for partially decorating a base material, which comprises partially bonding a skin material to a resin base material. Using a plurality of movable molds in which a skin material is arranged in the movable molds, and a fixed mold in which a plurality of gates for injecting a molten resin serving as a base material are formed facing the plurality of movable molds, A movable mold provided with a skin material is moved, and a molten resin is injected from a gate facing the movable mold to mold, and then a movable mold having no skin material is moved and the movable mold is also provided. The molten resin is injected from a gate facing the above, and the molten resin is injected from each gate by adjusting the timing of the valve gate with a delay.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 gist of the present invention.

1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional view showing a state immediately before mold clamping by a movable core die, and FIG. 2 is a fixed die and movable core. FIG. 3 is a sectional view of a step showing a mold clamping state by a mold, FIG. 3 is a sectional view of a step showing a mold clamping state of a fixed mold and a main movable mold, and FIG. 4 is a sectional view of a product.

In this embodiment, the movable mold for holding the partial skin material H and decorating the partial skin material H and the base material is a core movable mold 2
The movable mold for holding the core movable mold 20 and molding the base material will be described as 0 for the main movable mold 30. The molding apparatus S of this example includes a fixed mold 10, a core movable mold 20, a main movable mold 30, and a plurality of gates 11a.
The protrusion 21, and the groove 12 are the main constituent elements.

The material of the partial skin material H used in the present invention includes woven fabric, non-woven fabric, thermoplastic resin such as polyolefin, vinyl chloride and nylon, and polyolefin resin,
Examples thereof include sheets and films of thermoplastic elastomers such as polyester, urethane and vinyl chloride. Further, it is possible to use one of the above materials alone or a laminate of two or more thereof.

In order to give a softer feeling, a foamed sheet of polypropylene, polyethylene, urethane or the like is attached to the back surface of the partial skin material h, which is protected from the heat of the molten resin at the time of molding, or the partial skin material H. It is also possible to use a laminate in which a cloth, a sheet or the like is attached to the back surface for the purpose of strengthening the adhesive strength of the base material. When these partial skin materials H are used, preheating may be performed prior to supply in order to adjust the tensile stress and elongation of the partial skin material H.

The resin J used as the substrate in the present invention is
For example, polypropylene, polyethylene, polystyrene, acrylonitrile-styrene-butadiene copolymer, thermoplastic resin such as nylon, ethylene-propylene block copolymer, thermoplastic elastomer such as styrene-butadiene block copolymer, compression molding, injection Any of those commonly used for molding and extrusion can be used. Further, those containing an additive such as an inorganic filler, a filler pigment such as glass fiber, a lubricant, an antistatic agent or the like can be appropriately used.

The fixed mold 10 of this example has a desired mold shape, and the molten resin J as a base material is injected onto the upper surface of the mold, and a plurality of gates 11a are opened on the upper surface of the fixed mold 10. Is formed. These gates 11a are arranged so as to face the core movable mold 20 and the main movable mold 30 described below, and the gates facing the core movable mold 20 and the main movable mold 30 are The valve gate 11 is configured so that the molten synthetic resin J is injected with a time lag. The fixed mold 10 has a groove portion 1 into which a protrusion 21 of the core movable mold 20 described below can be inserted at a boundary portion between the core movable mold 20 and the main movable mold 30 during mold clamping.
2 is formed.

An unillustrated extrusion molding machine or injection molding machine is attached to the fixed side mold 10, and the synthetic resin JJ in a molten state from the extrusion molding machine or the injection molding machine is the mold of the fixed side mold 10. Supplied on the surface.

A core movable mold 20 and a main movable mold 30 are arranged so as to face the fixed mold 10. The outer periphery of the core movable die 20 is a protrusion 21 so that it can be inserted into the groove 12 of the fixed die 10. This protrusion 21
A needle or the like for holding the partial skin material H is formed at the tip of the.

The core movable die 20 has a partial skin material H.
The core movable mold 20 is configured to be movable on the main movable mold 30 by a drive mechanism (not shown) or the like. As the drive mechanism, a known device such as a hydraulic device, a pneumatic device, or a spring type device can be used. For example, when using a spring type, it is adjusted to ²⁰ to 80 kgf / cm ² . Further, the main movable mold 30 is also configured to be movable by a drive mechanism (not shown) or the like, and is moved in the mold clamping with a timing delayed from that of the core movable mold 20.

Next, a method of partially decorating a base material using the molding apparatus S having the above-mentioned structure will be described. First, the partial skin material H is attached to the core movable mold 20 that is arranged so as to face the fixed mold 10.

Next, the partial skin material H and the base material are molded.
This molding is performed by the core movable mold 2 with the partial skin material H attached.
0 is moved to move to the opposed fixed mold 10 side, and molten resin J is injected into the cavity from the gate 11a opposed to the core movable mold 20, and the mold is clamped and pressed to form the partial skin material H. And a base material. At this time, the partial skin material H
Since the end is attached to the protruding portion 21 of the core movable mold 20, the one surface side of the partial skin material H is pushed into the groove portion 12 while being abutted by the resin J.

The main movable mold 30 is moved during the integral molding of the partial skin material H and the base material, that is, after the timing of the movement of the core movable mold and the injection of the resin corresponding thereto is delayed. Also at this time, the molten resin J is injected from the gate 11a of the fixed mold 10 facing the main movable mold 30,
Apply mold clamping pressure. The above timing is performed by the valve gate 11 described above.

At this time, the partial skin material H is joined to the resin J by the protrusion 21 of the core movable die 20 of the groove 12 and moves so as to go around the protrusion 21 in the groove 12, but the resin J that has turned around is moved. Is joined with the resin J injected from the gate 11a of the fixed mold 10 facing the main movable mold 30, and holds the end of the partial skin material H with the resin J. Therefore, the terminal treatment of the partial skin material H becomes unnecessary.

[0021]

As described above, according to the present invention, with respect to an interior molded article such as a door trim in which a base material is partially decorated, partial laminating of a fabric or the like can be performed simultaneously with molding of the base material without a post-process. The base material can be integrally molded at the same time as the molding of the base material, the number of steps can be reduced to reduce the cost, and the bonding strength is improved without using an adhesive.

[Brief description of drawings]

FIG. 1 shows a molding process of an example according to the present invention,
It is sectional drawing which shows the state just before mold clamping by a core movable mold.

FIG. 2 is a sectional view of a step showing a mold clamping state by a fixed mold and a core movable mold.

FIG. 3 is a sectional view of a step showing a mold clamping state of a fixed mold and a main movable mold.

FIG. 4 is a sectional view of a product.

[Explanation of symbols]

 10 Fixed Mold 11 Gate Valve 11a Gate 12 Groove 20 Movable Mold (Core Movable Mold) 21 Projection 30 Movable Mold (Main Movable Mold) H Partial Skin Material J Synthetic Resin

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 31, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 4]

[Figure 3]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // B29L 9:00 31:58

Claims (1)

[Claims] 1. A method for partially decorating a base material, wherein a skin material is partially bonded to a resin base material, and a plurality of movable molds, wherein at least one movable mold is provided with the skin material, By using a fixed mold having a plurality of gates formed to face a plurality of movable molds and injecting a molten resin serving as a base material, the movable molds provided with a skin material are moved and Molding is performed by injecting a molten resin from the facing gate, then moving a movable mold having no skin material, and injecting the molten resin from a gate facing the movable mold, A method for partially decorating a base material, characterized in that the injection of the molten resin is adjusted by delaying the timing of a valve gate and injected from each gate.