JP2857339B2 - Foam mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a foaming mold, and more particularly to a foaming mold formed integrally with an insert material.

[0002]

2. Description of the Related Art For example, a foam molding of an instrument panel of an automobile will be described with reference to FIG. 2. First, as shown in FIG. 2A, a release agent such as a spray is applied to a mold surface of an opened upper mold 12. After the release agent 21 is applied by the device 22, as shown in FIG. 2B, the skin 24 is provided on the mold surface of the lower mold 11, and the core material for the instrument panel is inserted on the mold surface of the upper mold 12. Materials 23 are respectively arranged.

[0003] Next, as shown in FIG. 2 (C), after the foaming raw material 25 is injected into the back side of the skin 24 disposed on the mold surface of the lower mold 11,
As shown in (D), the mold is clamped, and the foaming of the liquid foaming raw material 25 is performed between the insert material 23 and the skin 24.

After the foaming of the liquid foaming raw material 25 is completed and the foam layer 27 is formed, as shown in FIG. 2 (E), the mold is opened and the foam I of the instrument panel is opened.
Is removed from the mold. When the next foam molding is subsequently performed, the process returns to (A) of FIG.

By the way, this instrument panel I
As shown in FIG. 3, the insert material 23, which is a core material used in the foam molding, has partial openings 29, 29 for air conditioning or installation of various devices. The opening 29 is provided with a masking tape 30 on the foam layer 27 forming side as shown in a chain line in FIG. 3 or a sectional view in FIG. Affixed.

[0006] The instrument panel molded product I to which the masking tape 30 is adhered and formed has a skin 24 closing the opening 29, a foam layer 27, and a masking tape, as shown by broken lines and chain lines in FIG. 30 is cut from the cutting line CC to obtain the final product.

However, in the above-mentioned foam molding, the following problems often occur particularly when the instrument panel core material (insert material) 23 having the masking tape 30 adhered to the opening is disposed on the mold 12 surface. Has occurred.
That is, in the step (B) of FIG. 2, the insert material 23 is arranged on the mold surface of the upper die 12, and the masking tape 30 is attached to the opening 29 of the insert material 23, At this time, the air compressed between the insert material 23 and the mold surface of the upper mold 12 concentrates in the opening 29 and increases the air pressure in the opening 29. As a result, as shown by an arrow a in FIG. Next, the flexible masking tape 30 is raised in the mold direction, that is, in the direction of the arrow p.

In the case of the insert material 23 such as an instrument panel core material, the masking tape 30 is easily lifted even when the masking tape 30 is stuck on a complicated curved surface. Many of the portions 29 are often formed at lower portions than the general portion of the mold surface, and the air pressure thereof is high. Further, as can be understood from FIG. 3, the elongated opening for the defroster is formed large. This tendency is remarkable because of the fact.

The masking tape 30 is made of an insert material 23
It goes without saying that a gap is formed at the edge of the opening 29 when it rises from the edge of the opening 29, thereby deteriorating the appearance and quality of the molded product. In addition, as shown in FIG. 5, a part 21A of the release agent 21 applied to the surface of the mold 12 may enter the gap where the masking tape 30 has floated,
In this case, the adhesive force of the masking tape 30 is significantly reduced, which causes a peeling phenomenon of the opening. Further, there may be a serious problem that the peeling progresses with the elapse of time and the pad portion made of the foam rises.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such a problem. When an insert material whose opening is closed by a masking tape is arranged on a mold surface, the present invention has been proposed. An object of the present invention is to provide a structure of a foaming mold that does not cause the masking tape to float even when air is concentrated in the opening, and thus can obtain a foam molded product having excellent appearance and quality.

[0011]

That is, the present invention provides:
In a foaming mold in which the opening of the insert material having an opening is closed with a masking tape and then the liquid foaming material is foamed to be integrally molded with the insert material, the foam molding die corresponds to the opening of the insert material. The present invention relates to a foaming mold characterized in that a deaeration hole communicating with the outside of the mold is provided on the mold surface to be molded.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an embodiment of a foam molding die according to the present invention. In the foam molding of the instrument panel shown in FIG. 2, a main part enlarged view showing a state where an insert material of an instrument panel core material is arranged on an upper mold. It is sectional drawing.

As described above with reference to FIG. 2, the foam molding die of the present invention has an insert 2 having an opening 29.
3 relates to a foaming mold in which the opening 29 is closed with a masking tape 30 and then a liquid foaming material is foamed to be integrally molded with the insert material. Note that the entire configuration of the foaming mold and the molding thereof are the same as those described above, and thus the description is used.

In the structure of the present invention, the mold 40 (here, the upper mold) has a mold surface 40a on which the insert material 23 is arranged, as is well understood from FIG. At positions corresponding to the openings 29 of the insert material 23, deaeration holes 41, 42, 43 communicating with the outside of the mold are provided.

The deaeration holes 41, 42, 43 are compressed between the insert material 23 and the upper mold surface 40a when the insert material 23 is disposed on the upper mold surface 40a.
The air concentrated in the opening 29 of FIG. 1 escapes from the mold as shown by the arrow b in FIG.

The deaeration hole is a hole for allowing air to escape, so it is not necessary to make it so thick. However, if it is too thin, the deaeration hole is closed by the intrusion of the release agent 21 applied to the mold surface 40a. Because of the possibility that the diameter is 2 to 10
mm, especially about 3 to 6 mm. Further, the number of the deaeration holes can be arbitrarily determined according to the size of the opening 29 of the insert material 23.

The release agent 21, the insert material 23, and the skin 24 are appropriately selected from known ones. For example,
Examples of the release agent 21 include natural wax, polyethylene or polypropylene wax, examples of the insert material 23 include ABS resin and polypropylene, and examples of the skin 24 include plastic leather.

In this embodiment, a foaming mold for instrument panel molding has been described. However, the present invention can of course be applied to a foaming mold of various foamed articles having openings. The present invention also provides an open injection type foaming mold in which the liquid foaming material is closed after the liquid foaming material is injected. The closed injection in which the liquid foaming material is injected between the insert material and the skin with the upper mold and the lower mold closed. It is also used for foam molds of the type.

[0019]

As shown and described above, according to the foaming mold of the present invention, when the insert material is arranged on the mold surface, the air concentrated at the opening of the insert material escapes from the vent hole. The air pressure in the opening does not rise, and the masking tape does not float inside the mold. And
As a result, the appearance and quality of the molded product, which often occurred in the past due to the lifting of the tape, decreased the appearance and quality of the molded product, the peeling phenomenon of the opening due to the decrease in the adhesive force of the masking tape, and the pad portion due to the peeling over time Various problems such as lifting can be solved.

[Brief description of the drawings]

FIG. 1 is an essential part enlarged sectional view showing one embodiment of a foaming mold of the present invention, showing a state where an insert material is arranged on a mold surface.

FIG. 2 is a schematic cross-sectional view sequentially showing steps of foam molding of an instrument panel for an automobile as an example of a foam molded article having an opening.

FIG. 3 is a perspective view showing an example of an insert material used for molding in FIG. 2;

FIG. 4 is a cross-sectional view taken along line 4-4 of the insert material shown in FIG. 3;

FIG. 5 is a main part enlarged cross-sectional view showing a state where an insert material is arranged on a mold surface in a conventional process.

[Explanation of symbols]

 21: Release agent 23: Insert material 29: Opening 30: Masking tape 40: Upper die 40a: Upper die surface 41, 42, 43: Deaeration hole

Claims (2)

(57) [Claims] 1. A foaming mold in which an opening of an insert material having an opening is closed with a masking tape and then a liquid foaming material is foamed to be integrally molded with the insert material. A foam molding die, characterized in that a deaeration hole communicating with the outside of the die is provided in a die surface corresponding to the opening of (1). 2. The foaming mold according to claim 1, wherein the diameter of the deaeration hole is 2 to 10 mm.