JPH04109111U - Seal structure for foam molded products - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a seal structure that facilitates trimming of the skin in foam molding in which the skin and core are integrally molded with a foam material. [Structure] Foaming material is injected into the filling part between the skin and core material, and this foaming material is foamed and integrally molded.
In a sealing structure for a foam molded product, in which a seal part at an edge part prevents foam material from leaking from a filling part until molding, a plurality of leakage prevention ribs are provided in the seal part, and each rib A gap is provided between them to form a gas vent passage, and the apex of the leakage prevention rib is a corner. Then, when the mold is clamped, if a perforation-like cut is formed in the skin using this corner, subsequent trimming work will be facilitated.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is applicable to foam molding in which the skin and core are integrally molded with the foam material. The present invention relates to a seal structure that facilitates trimming of the epidermis.

0002

[Conventional technology]

The applicant has already developed a seal structure for foam molded products as disclosed in Japanese Patent Application No. 2-304466. I'm proposing a body. This technology can be applied, for example, to instrument panels inside automobiles, Regarding the molding method of foam molded products used as interior materials such as safety panels, It prevents the foam material from leaking out of the filling space, and also effectively removes the gas generated during foaming. This is to prevent problems such as cavities occurring inside the product due to removal. child This is a type of foam molding in which foam material is injected between the layered skin and core material. Multiple foam material leakage prevention ribs are provided on the edges of the product, and these ribs prevent foam material from leaking. In addition to preventing air leakage, a gap is provided between each rib to form a gas venting passage. That's what I do.

0003

[Problem that the idea aims to solve]

However, in the method described above, the seal part is removed by trimming after foam molding. This results in a waste of time and effort, and improvement is desirable. won.

0004

[Means to solve the problem]

In order to solve this problem, the present invention injects foam material into the filling area between the skin and the core material. The sealing part prevents foam material from leaking from the filling part during foam molding. In foam seal structures, multiple leakage prevention devices can be used depending on the trimming position of the skin. Ribs are provided, and the space between each rib is configured as a gas vent passage, and the apex of the rib is is the corner.

[0005]

[Effect]

The foam material injected into the filling part is covered with ribs to prevent leakage until it is foamed and molded. This prevents leakage, and the gas generated during foaming is discharged from the gas vent passage. In addition, by making the apex of the rib a corner, the skin material is covered at the apex of the rib when the mold is closed. A perforation is formed leaving a section for the gas vent passage. others After molding and releasing, the skin can be easily trimmed by pulling it by hand, eliminating the need for expensive trimming. No equipment required. Moreover, since the epidermis is not completely cut inside the mold, the epidermis There is no problem such as the rim remaining in the mold.

[0006]

【Example】

Examples of the seal structure of the foam molded product of the present invention will be explained based on the attached drawings. I will clarify. Figure 1 is a perspective view showing an example of the seal structure of the foam molded product of the present invention, and Figure 2 is the same as that of Figure 1. A sectional view taken along the line A-A, FIG. 3 is a perspective view showing another embodiment, and FIG. 4 shows a conventional seal part. The cross-sectional view and FIG. 5 are process diagrams showing a conventional molding method. For example, interior materials such as vehicle instrument panels and door panels are made using foam molded casings. A method is adopted in which foam material is injected into the cavity and molded into the skin and core material. Ru. In other words, conventionally, as shown in Figs. 4 and 5, cores formed by injection molding etc. Material 11 and a surface formed by press processing, vacuum processing, slush molding, etc. The skin 12 is set in the respective molds 13 and 14, and the space between the core material 11 and the skin 12 is A foamed material 16 is injected into the filling portion 15 from the direction of the arrow in the figure, and this foamed material 16 is expanded. It is foam-cured and integrally molded. Then, the filling part 15 is held until the molding is completed. The overlapping edge of the skin 12 and core material 11 is sealed to prevent the foam material 16 from leaking out. 17, and a protruding member 18 provided on this seal portion 17 prevents leakage. In both cases, foaming gas flows through the gaps between the plurality of protruding members 18 provided in the direction perpendicular to the plane of the paper. I am trying to make it emit. When the molding is finished, take out the molded product and remove unnecessary parts. The product is obtained by trimming.

[0007] The seal structure of the present invention is characterized by the seal structure of the seal portion as described above. This will be explained below based on FIGS. 1 and 2. As shown in FIG. 1, the edges of the core material 1 and the skin 2 are configured as a sealing portion 7. The seal portion 7 is provided with a plurality of protruding members 8. This protruding member 8 is Protrudingly provided on the sealing surface of the core material 1, in a direction perpendicular to the inflow direction of the foam material 6. The leakage prevention rib 8a and a pair of parallel ribs 8b along the inflow direction are U-shaped. It is formed as follows. Moreover, between each parallel rib 8b, 8b of adjacent projecting member 8 is configured as a gas vent passage 9, and the U-shaped opening is formed as a gas vent passage 9, and the U-shaped opening is formed as a gas venting passage 9. It opens toward the outside in the opposite direction.

[0008] The leakage prevention rib 8a has a triangular cross-sectional shape, and a corner 10 is provided at the top. ing. The apex angle of this corner 10 is preferably an acute angle, particularly 30° to A range of 60° is optimal. In addition, the position of this leakage prevention rib 8a is on the epidermis. It is aligned with the trimming position. The reason why this protruding member 8 is U-shaped is that , in order to increase the sealing effect by reducing the contact area between the skin 2 of the seal part 7 and the core material 1. The aim is to ensure tight contact with a small mold clamping pressure. Also, the reason why the top of the leakage prevention rib 8a is a corner 10 is because this corner 10 corresponds to the corner 10. This is to make a cut in the contacting skin 2, and there are no perforations except for the gas vent passage 9. This is for cutting in a diagonal shape.

[0009] In the seal structure of the foam molded product constructed as described above, a core material 1 is placed in the mold. After setting the skin 2 and clamping the mold, foam material 6 is injected into the filling part 5 between the two. Foam. At this time, the gas generated in the filling part 5 is quickly exhausted from the gas vent passage 9. The foamed material 6 that has been discharged and foamed is prevented from leaking to the outside by the leakage prevention rib 8a. thwarted. Moreover, by clamping the mold, perforations are made on the skin 2 along the trimming line. This results in the formation of a cross-shaped cut. After the foam hardening is completed and the molded product is removed from the mold, if you pull the skin by hand, Can be easily cut along perforations. In other words, it is possible to reduce the trimming process. Ru. Also, since the gas vent passage 9 remains uncut, the molded product is removed from the mold. There is no problem such as the skin 2 being cut and remaining inside the mold. Therefore, only the trim process Therefore, it becomes easy to manage the waste material of the skin 2 even within the foaming mold. Note that the direction of the protruding member as described above is free; for example, as shown in FIG. The same effect can be obtained by positioning the rib 8a for preventing leakage outward and directing the U-shaped opening toward the filling part 5. It has similar effects.

0010

[Effect of the idea]

As described above, the seal structure of the foam molded product of the present invention can be obtained by closing the foam mold. When cutting, make a cut in the epidermis at the top of the leak-preventing rib, and then cut a cut along the trimming line. Since a thin seam is formed, trimming can be done by simply pulling it by hand after demolding. Do it, it will be very easy. It also has the effect of eliminating the need for a trimming device. .

[Brief explanation of drawings]

[Fig. 1] A perspective view showing an example of the seal structure of the foam molded product of the present invention.

[Figure 2] Cross-sectional view taken along line A-A in Figure 1

[Fig. 3] Perspective view showing another embodiment

[Fig. 4] Cross-sectional view showing a conventional seal part

[Figure 5] Process diagram showing the conventional molding method

[Explanation of symbols]

(1) Core material (2) Epidermis (5) Filling part (6) Foaming material (7) Seal part (8a) Leakage prevention rib (9) Gas vent passage (10) Corner (13), (14) Molding mold

──────────────────────────────────────────────── ─── Continued from front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B29L 31:58 4F

Claims (1)

[Scope of utility model registration request] Claim 1: A foamed material is injected into the filling part between the skin and the core material, and the foamed material is foamed and integrally molded. In the sealing structure of the foam molded product, the sealing part is provided with a plurality of leakage prevention ribs in accordance with the trimming position of the skin, and each leakage prevention rib is provided in the sealing part in accordance with the trimming position of the skin. 1. A seal structure of a foam molded product, characterized in that the space between the ribs for preventing leakage is configured as a degassing passage, and the apex of the rib for preventing leakage is a corner.