JP2502315Y2 - Core material for foam molding - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam molding core material used for molding a component having a foam layer integrally formed between a skin and a core material.

[0002]

2. Description of the Related Art For parts such as instruments, glove boxes, console boxes, etc. installed in automobiles, the impact force with these parts is mitigated (shock absorption).
It is well known that a foamed elastic body layer is integrally formed on the surface of a core material of a component as a cushioning means for crimping.

For example, an instrument structure mounted and used in a passenger compartment of an automobile has a structure as shown in FIG. 1, and its structure is a core made of a hard resin made of polypropylene mixed with glass fiber. It comprises a material 1, a urethane foam layer 2 layered on the surface of the core material 1, and a skin 3 adhered to the surface of the urethane foam layer 2.

In the manufacturing process for producing this instrument, firstly, the core material 1 and the outer skin 3 are separately produced, and the urethane foam cavity 4 is formed on the outer skin 3 as shown in FIG. And the core material 1 is set in the urethane foam core mold 5. Next, on the surface of the core material 1 set in the core mold 5, the core material 1 is
In order to enhance the adhesion to the urethane foam as described below, a primer 6 is applied, and the cavity mold 4 is also applied.
After injecting the foamable urethane raw material onto the outer skin 3 set in step 1, the molds 4 and 5 are closed. Then, the reaction is cured to foam urethane to form a urethane foam layer 7 which is integrated with the core material 1 and the skin 3, and is taken out as a mold opening latter half product, and then an extra portion formed on the edge of the half product. The outer skin 3 ′ and the urethane foam layer 7 ′ are cut and cut from the trimming line 8 shown in FIG. 3 to obtain a product.

[0005]

However, when the primer 6 is applied to the surface of the core material 1 in the above molding process, the primer 6 flows outward from the trimming line 8 to the peeling portion (trimming portion) of the urethane layer. Since the primer is applied up to this point, the urethane layer 6 ′ to be trimmed is adhered to the surface of the core material 1, and it takes a lot of time and effort to peel off the urethane layer 6 ′ to be trimmed from the core material 1 in the subsequent work. It was costly and had problems in terms of productivity and economy.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. A protrusion for stopping the flow of the primer along the trimming line on the primer application surface of the core material to be applied with the primer is provided. Provided is a foam molding core material which is formed with a stripe so that the primer applied to the core material does not adhere to the outside of the trimming line, thereby facilitating the trimming work of the urethane layer and the skin. Especially.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in FIGS. 4 to 6. The same parts as those of the present embodiment and the conventional example are designated by the same reference numerals as those used in the conventional example, and the same parts will be described. Is omitted. That is, in FIG. 4, reference numeral 11 denotes a core material (insert part), and a protrusion 12 having a chevron cross section is integrally formed on the primer application surface of the core material 11 along the trimming line 8. The height of the ridge 12 is preferably about 1 mm.

The manufacturing process of the molded product using the core material 11 is the same as that described in the conventional example, and the pre-molded skin 3 is set in one foam cavity mold 4 and the other foam core mold is set. The core material 1 having the above-mentioned structure, which is preformed in No. 5
Set 1. Next, while the foamable urethane raw material 7 is injected on the upper side of the skin 3, the surface of the core material 11 is
A primer 6 is applied to improve adhesion with urethane foam. At the time of applying the primer 6, the primer 6 is applied inside with the ridge 12 as a boundary. Therefore, the protrusion 6 prevents the primer 6 from flowing out to the peripheral portion of the core material 11 due to the damming action. Then, by closing both molds and foaming urethane, a semi-finished product in which the core material 11, the skin 3, and the urethane foam layer 7 are integrated is obtained (see FIG. 5). Then, in the semi-finished product molded in this way, the excess skin 3'and the urethane layer 7'extended and protruding outward from the trimming line 8 of the semi-finished product are removed with the ridge 12 as a boundary, Since the primer 6 is not blocked by the protrusions and is not flowed outside the protrusions 12 of the core member 11, the protruding urethane layer 7 ′ can be peeled off from the core member 11 very easily.

As described above, in this embodiment, the core material 11
Since the ridges 12 for preventing the primer 6 from flowing are provided along the upper trimming line, the urethane layer 7 ′ and the core material 1 protruding outward from the ridges 12 of the core material 11 are provided.
1 is not strongly adhered to each other, so that the core material 11
It is extremely easy to remove the extra urethane layer 7'and the skin 3'attached to the outside of the trimming line at the peripheral edge of the product, and the productivity and economy of the product are significantly improved.

As described above, according to the present invention, the foam molding 7'is formed on the primer-coated surface of the core material 11 to which the primer is to be coated.
Since the core material for foam molding is formed with the ridges 12 for stopping the flow of the primer along the trimming line, the primer is provided between the peripheral edge portion of the core material and the foam molded body to be trimmed. Is not intervened,
Therefore, it is very easy to remove the extra urethane layer 7'and the skin 3'attached to the outside of the trimming line on the peripheral edge of the core material 11, and the productivity and economy of the product are significantly improved. The effect is obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the configuration of an instrument.

FIG. 2 is an explanatory view of the operation during conventional foam molding.

FIG. 3 is an explanatory diagram at the time of trimming in a conventional foamed molded product.

FIG. 4 is a structural explanatory view showing an embodiment of a core material according to the present invention.

FIG. 5 is an operation explanatory view during foam molding using the core material of this embodiment.

FIG. 6 is an explanatory diagram of trimming according to the present embodiment.

[Explanation of symbols]

3: Skin 4: Cavity type 5: Core type 6: Primer 7: Urethane foam 8: Trimming line 11: Core material 12: Protrusion

Claims (1)

(57) [Scope of utility model registration request] 1. A ridge (12) for stopping the flow of the primer is formed along the trimming line of the foam molding (7 ') on the primer-coated surface of the core material (11) to be coated with the primer. A core material for foam molding, which is characterized in that