JP3177176B2 - Slash-molded skin-bonded product and molding method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slash-molded skin-bonded product such as an instrument panel, a door trim, and a console box, and a method of molding the slush-molded skin. Related to the skin terminal processing.

[0002]

2. Description of the Related Art Conventionally, as a means for covering and integrating a surface of a resin core with a surface, a vacuum-molded surface with a laminate has been used. Even if the terminal is left cut at the outer peripheral portion of the core, no serious adverse effect is caused in appearance.

Further, instead of the vacuum-molded skin with a laminate, a skin is preformed by slash molding, and the outer periphery thereof is trimmed with a cutter or the like so as to conform to a predetermined shape, and the skin is formed into a core mold. After fixing to the mold surface, by combining the cavity molds, in the process of filling the voids of both molds with resin to form the core, the skin on the surface side of the core also having the desired shape Means for coating are employed.

[0006] Further, as shown in FIG. 6, as a partial skin-bonded product 21 which covers and covers only a necessary portion of the surface of the molded core 22 with a skin 23, a predetermined portion of the core 22 corresponding to a terminal portion of the skin 23 is provided. A groove (parting groove) 24 is provided in
The appearance of the product was ensured by fitting the terminal of the epidermis into the groove and cutting off the epidermis bonding part 25 and the resin exposed part 26.

[0005]

However, in the means for covering the entire surface of the core with a skin, the end of the skin substantially coincides with the outer edge of the core. By concealing the part, care is not taken more than necessary for the terminal treatment of the skin, but covering the entire surface with the skin increases the cost of the product, and improvement in this respect is required.

On the other hand, the above-mentioned parting groove is required for the convenience of the manufacturing process, and limits the original design, and cannot be said to have good appearance. The parting groove is set to hide the skin end from the eyes, and therefore, it is desirable to reduce the width and depth of the groove. However, in an injection mold for molding a core, narrowing the groove width has a problem in the strength of the injection mold, and there is a contradiction in that the appearance of the product and the strength of the injection mold are contradictory.

The present invention has been made to solve the above-mentioned problems, and manufactures a skin which partially covers the surface of a core body by slush molding, and treats the end of the skin as a product in the slush molding. The object of the present invention is to provide a slush-molded skin-bonded product and a method for molding the same, which eliminate the need for a groove in the core body, improve the appearance of the skin-bonded product, and reduce the molding die and finishing cost. I do.

[0008]

That is, in order to achieve the above object, a slash-molded skin-bonded product according to the present invention comprises:
In a resin molded product in which a slash-molded skin is partially adhered to the surface of a resin core, a V-notch surface and a thin portion formed at a product end of the skin are embedded in a part of the core. It is characterized by.

The above-mentioned skin is a skin obtained by slush-molding a pulverized thermoplastic elastomer, or a skin obtained by slush-molding a vinyl chloride resin.

Further, the method for forming a slash-molded skin-bonded product according to the present invention is characterized in that, at the time of slush molding of the skin, a thin portion of a V notch is provided between a skin which is a product part and a skin which is a part outside the product. After forming a thick portion, trimming the thin portion of the skin, and arranging the skin on the cavity surface of the cavity so that the V-notch surface of the skin serving as a product portion faces downward, the cavity mold is formed. The molten resin is supplied to a gap formed between the core and the core mold, and the skin and the core are integrally formed and joined.

The above-mentioned skin is a skin obtained by slush-molding a pulverized thermoplastic elastomer, or a skin obtained by slush-molding a vinyl chloride resin.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a slash-molded skin-bonded product of the present invention and a method for molding the same will be described in detail with reference to the accompanying drawings using an instrument panel as an example. 1 is a perspective view of a part of an instrument panel 1 which is a molded product with a skin, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is an enlarged view of a portion X in FIG. Sectional view,
FIG. 4 is a partial cross-sectional view of a slash-molded skin in which a V notch is formed, and FIG. 5 is a partial cross-sectional view showing a state where the skin is set in a cavity mold and resin is injected.

In FIG. 1, a predetermined portion of the surface of a synthetic resin core 2 forming the product shape of the instrument panel 1 is covered with a slash-molded skin 3. This skin 3 is formed, for example, by attaching, melting, and cooling and solidifying vinyl chloride resin powder on the inner wall surface of a slush molding die having a predetermined shape heated to a temperature equal to or higher than the melting point of vinyl chloride resin to form a solid skin. , Is a demolded one.

The skin 3 in the embedding type shown in FIGS. 2 and 3 is a skin 3 serving as a product part 4 shown in FIG.
The outer skin 3 ′ is removed by trimming the skin thin portion 7 at the tip of the V notch 6 formed between the outer skin 3 ′ and the outer skin 3 ′ that becomes the outer part 5 of the product. The V-notch surface 9 and the thin-walled portion 7 are embedded in a part of the core body 2 and bonded.

The skin 3 is made of vinyl chloride resin (PV).
C), a styrene-based thermoplastic elastomer, an olefin-based thermoplastic elastomer (TPO), a urethane-based thermoplastic elastomer (TPU), a polyester-based thermoplastic elastomer (TPAE), or the like, obtained by slush molding, and the skins thereof. Has a thickness in the range of 1.6 to 4.2 mm. The material of the core 2 is polypropylene resin, A
It is made of BS resin, polystyrene resin and the like.

The skin 3 used in the present invention has a two-layer structure in which a surface layer 3a is laminated on the surface side of the skin 3 and a foam layer 3b is laminated inside the surface layer 3 in addition to the single layer having only the surface layer shown in FIG. An inner layer 3c on the back side of the laminated skin or the two-layer laminated skin
It is a matter of course that it includes a three-layer laminated skin in which is laminated.

Next, a method of forming a slush-molded skin-bonded product according to the present invention will be described with reference to FIGS. The skin 3 separately formed by powder slush molding is, for example, a vinyl chloride resin powder is coated on the inner wall surface of a slush molding die having a predetermined shape having a triangular protrusion on an inner surface heated to a melting point of the vinyl chloride resin or higher. Adhesion,
After melting, cooling and solidifying to form a solid skin,
It has been removed.

As shown in FIG. 4, the skin removed from the slush molding die is provided in a predetermined position between the skin 3 serving as the product part 4 and the skin 3 'serving as the outside 5 of the product. V notches 6 corresponding to the triangular projections are integrally formed. The thin portion 7 of the skin on which the V notch 6 is formed is a thin portion because the triangular projections provided on the inner wall surface of the mold are difficult to attach to the material when the slash molding die is rotated due to the slash molding method. Easy to do. In addition, the thick portion 8 at the end of the skin is thick and has high rigidity because the triangular projections provided on the mold hinder the movement of the material and easily accumulate the material due to the slash molding method. Is easy to position and has good shape retention.

As the shape of the V notch 6, the tip angle is preferably as acute as possible in order to improve the cutting accuracy, but is usually about 30 °. The thickness of the skin thin portion 7 is 0.5
mm or less, it is easy to trim, and if necessary, it can be torn by hand. Further, the thickness of the thick portion 8 at the end of the skin is in the range of 1 to 2 times the thickness of the other skin, and by increasing the thickness of the end of the skin, the rigidity of the end of the skin is increased. There is an advantage that the positioning of the resin can be facilitated, and the positional deviation at the time of filling the molten resin can be prevented.

The thin portion 7 is trimmed, and the skin 3 leaving the upper edge portion of the end of the skin 3 is attached to the cavity surface 11 of the cavity 10 by the V-notch surface 9 and the thin portion 7 of the skin 3 serving as a product part. Arrange so that it is downward. In this case, the cavity mold 10 has a passage 1 penetrating into the mold surface 11 of the mold surface.
The outer skin 3 is mounted on the cavity surface 11 of the cavity mold 10 by operating the suction device 14 and evacuating the vacuum.

In contrast to the cavity type 10, the core type 1
2 are combined to form a cavity 15 corresponding to the shape of the core formed in both molds, and the cavity 15 is filled with a resin for forming the core in the direction of arrow Y to form the core 2. The core body 2 and the skin 3 are integrated to obtain the instrument panel 1 as a molded product.

As a method of forming a core united with the skin by using the combined cavity mold and core mold,
For example, compression molding, injection molding, or fixing the molded skin to the cavity mold cavity surface, injecting resin into the unclosed cavity mold, then closing the core mold and pushing out the injected resin For example, there is an SPM molding method for integrating the core with the skin.

[0023]

As described above, in the slush-molded skin-bonded product of the present invention, the V-notch surface and the thin-walled portion formed at the product end of the skin are embedded in a part of the core, so that the core is Grooves in the body can be eliminated, and the appearance of the skin-laminated product can be significantly improved.

In the method of forming a slash-molded skin-bonded product of the present invention, a thin-walled V-notch is provided between a skin to be a product part and a skin to be outside the product at the time of slush molding of the skin. After forming the meat portion, trimming the thin portion of the skin, and arranging the skin on the cavity-type cavity surface so that the V-notch surface of the skin serving as the product portion faces downward, The following effects can be expected by supplying the molten resin to the void formed between the core mold and the core and integrally molding the skin and the core.

[0025] The groove of the core body can be eliminated, and the appearance appearance of the skin-bonded product can be remarkably improved, the formability of the skin alone and the product can be improved, and the cost of the mold can be reduced. . In forming the slash-molded skin, a V-notch is provided between the skin that is the product part and the skin that is the outside of the product, so the trim line of the skin becomes thinner, and the trim can be torn by hand, reducing the finishing cost. It becomes possible to reduce.

[Brief description of the drawings]

FIG. 1 is a perspective view of a part of an instrument panel according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view showing a portion X in FIG. 2;

FIG. 4 is a partial cross-sectional view of a slash-molded skin in which a V notch is formed.

FIG. 5 is a sectional view showing a state after the skin is set on the cavity mold and the mold is closed.

FIG. 6 is a cross-sectional view of a skin bonding product showing a conventional parting groove type.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded product (instrument panel) 2 Core body 3 Skin which becomes a product part 3 'Skin which becomes the outside of a product 4 Product part 5 Outside a product 6 V notch 7 Thin part 8 Thick part 9 V notch surface of skin 10 Cavity type 11 Mold surface 12 Core type 15 Void

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-52242 (JP, A) JP-A-3-27910 (JP, A) JP-A-5-329849 (JP, A) JP-A-4- 226718 (JP, A) JP 7-90560 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 69/00-69/02 B29D 31/00 B29C 41/00- 41/52 B29C 33/00-33/76

Claims (6)

(57) [Claims] 1. A resin molded product in which a slash-molded skin is partially adhered to the surface of a resin core body, wherein a V-notch surface and a thin portion formed at a product end of the skin are part of the core body. A slash-molded skin-bonded product characterized by being buried. 2. The slush-molded skin bonded product according to claim 1, wherein the skin is a skin obtained by slush-molding a pulverized thermoplastic elastomer. 3. The slush-molded skin bonded product according to claim 1, wherein the skin is a skin obtained by slush molding a vinyl chloride resin. 4. A slash molding of a skin, a thin portion of a V notch is provided in advance between a skin to be a product part and a skin to be outside the product, a thick part is formed, and the thin part of the skin is trimmed. After arranging the skin on the cavity surface of the cavity mold so that the V-notch surface of the skin serving as the product part is directed downward, the molten resin is formed in the gap formed between the cavity mold and the core mold. And a method for forming a slash-formed skin-bonded product, wherein the skin and the core are integrally formed and combined. 5. The method for forming a slush-molded skin-bonded product according to claim 4, wherein the skin is a skin obtained by slush-molding a pulverized thermoplastic elastomer. 6. The method for forming a slush-molded skin-bonded product according to claim 5, wherein the skin is a skin obtained by powder slush molding a vinyl chloride resin.