JP2002168505A - Foam molded body with seal function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure in which molding for a sealing portion by manual is eliminated, and which has an identical quality as that of an expansion molded structure body part. SOLUTION: An expansion molded structure with a sealing function according to the present invention is premised on an expansion molded structure which is formed as in a prior art such that an opening section 12 of an air vent passage 11 of an expansion molded structure 11 in which the foregoing vent passage 11 is formed is connectable with an opening section 22 of a partner side member 2. Further, a protrusion 4 with a predetermined height is provided as a sealing section around the opening section 12 on the side of the expansion molded structure 1. The protrusion 4 is molded integrally with a body of the expansion molded structure 1 simultaneously with the molding of a body of the expansion molded structure 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed molded article having an air passage for passing air such as hot air or cold air, and more particularly to an improved foamed molded article having a sealing function.

[0002]

2. Description of the Related Art Conventionally, various shapes of duct members having a ventilation path for passing air such as hot air or cold air have been used for a heater, a cooler or a ventilator. When a foam molded article made of a foamable plastic such as polystyrene is used as the duct member, there is an advantage that the temperature of hot air or cold air can be effectively maintained due to its excellent heat insulating property.

A duct member made of such a foamed molded article is used, for example, inside the above-mentioned heater or the like, by connecting to a hot air outlet of a hot air generator or to a blowing member to the outside. It is. 3 and 4 show an example of such a connection structure. FIG. 4 shows a case where the opening 12 of the air passage 11 of the foam molded article 1 as a duct member is connected to the opening 22 of the mating member 2. As shown, around the opening 12,
A seal member 3 made of a urethane foam tape is attached with an adhesive or the like to prevent air leakage.

However, such urethane foams
In the method using tape, it is necessary to rely on manual work, so it is troublesome, the cost is increased together with the material cost, and the sealing material is easily peeled off due to the aging of the adhesive, and the sealing effect is improved over many years. There was a problem in that it could not be maintained.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has a sealing function which eliminates the need for manually forming a sealing portion as described above. The present invention provides a foam molded article having a sealing function and having a seal portion having the same quality as a foam molded article main body.

[0006]

An object of the present invention is to provide a foam molded article having an air passage formed so that an opening of the air passage can be connected to an opening of a mating member. A foam molding having a sealing function according to the present invention, characterized in that a ridge having a fixed height is formed integrally with the foam molded body at the same time as the molding of the foam molded body, around the opening on the molded body side. It can be solved by the body. Further, the present invention provides a foam molded article having a sealing function in which the cross-sectional shape of the ridge is a triangle having a vertex as a vertex, or a form in which the vertex of the triangle is set to 28 degrees or more. It can be preferably embodied as a foamed molded article having the sealing function.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a foam molded article having a sealing function according to the present invention will be described with reference to FIGS. The foamed molded article having the sealing function of the present invention is, like the above-described conventional case (FIGS. 3 and 4), the opening 12 of the vent passage of the foamed molded article 1 in which the ventilated passage 11 is formed. Is presumed to be a foam molded body which is formed so as to be connectable by pressing against the opening 22 of FIG. It should be noted that the illustrated shape is merely an example for convenience of explanation, and it goes without saying that the present invention is not limited to such a shape as a duct member.

A feature of the present invention lies in that a ridge 4 having a certain height is provided as a sealing means around the opening 12 on the foam molded body 1 side.
Is that the foam molded article 1 is molded integrally with the foam molded article 1 at the same time as the foam molded article 1 is molded.

In the foam molded article 1 of the present invention, expandable plastic particles made of a thermoplastic resin such as a polystyrene resin or a polyolefin resin such as polypropylene or polyethylene are filled in a mold cavity having a predetermined shape. Heating steam is supplied, heat-fused, and integrally foam-molded to produce a foam molded body having the shape of the cavity as a prototype. In the present invention, the ridge 4 is provided in the mold cavity. Ridge 4 in advance
Is provided, and foam molding such as filling, heating, and fusion of the expandable plastic particles is performed using this mold.
It can be formed integrally with the main body.

Thus, according to the present invention, it is not necessary to perform a manual operation such as attaching a sealing tape as in the prior art, and the ridge 4 as a sealing member is formed around a desired opening at the same time when the main body is formed. Therefore, labor saving can be achieved, and as a result, significant cost reduction can be achieved. Further, since the protruding portion 4 having the sealing function of the present invention is made of a foamed plastic material having the same component as the foamed molded article main body, its life is long as in the case of the main body, and it is peeled off as in the prior art. There is an advantage that disadvantages such as are eliminated.

The form of the ridge 4 which is a feature of the present invention may be a plurality of rows as required, such as one row in FIG. 1A, two rows in FIG. 1B, or three rows in FIG. The cross-sectional shape thereof is a triangular ridge 41 having a vertex at the top of (d), and a trapezoidal ridge 4 having a substantially circular top at (e).
2, (f) a trapezoidal ridge 43 with a flat top, and (g) a plurality of corrugated rows of ridges 43 can be appropriately employed.

Among them, the cross-sectional shape of the ridge 4 is a triangular shape having the apex as the apex as shown in FIG. 1D.
This is preferable because it is easy to adhere to the film and a stable sealing function can be obtained. In this case, it was found that it is more preferable to set the apex angle of the triangle to 28 degrees or more.

The reason why it is preferable to set the apex angle of this triangle to 28 degrees or more will be described. In this ridge 41, an inverted V-shaped groove 51 corresponding to the ridge 4 is provided in advance in the mold cavity shown in FIG.
After filling the foamable plastic particles 6 of about 5 to 10.0 mm, foaming such as heating and fusion is performed, and the foamable plastic particles 6 inscribed in the inverted V-shaped groove 51 are assumed. When the distance H from the center of the plastic particle 6 having the average diameter D to the tip of the inverted V-shaped concave groove 51 is larger than 2D, the tip 52 becomes narrower. 6 was hardly filled at the time of foam molding, and irregularities were formed in the peaks connecting the tips, and the ridges 4 having a constant height were not formed, and it was found that the sealing function was greatly impaired.

Here, it is preferable that H ≦ 2D. This condition is 2 in terms of the apex angle of the triangular ridge 4.
This is equivalent to 8 degrees or more. In relation to the distance H from the center of the plastic particles 6 having the average diameter D to the tip of the inverted V-shaped concave groove 51, this H is 0.5D <H ≦
It is more preferable to set the apex angle of the triangle so as to be in the 2D range.

According to the findings of the inventors of the present invention,
The base width of the ridge 4, that is, the inverted V-shaped groove 5 in FIG.
The width W of 1 is preferably at least twice the average diameter D of the expandable plastic particles 6, that is, W ≧ 2D, since the minimum strength of the entire ridge 4 is maintained as a sealing member. This is because the total number of expandable plastic particles 6 forming the portion 4 is a maximum of 21 on a cross-sectional basis, and the shape of the ridges 4 becomes unnecessarily large when the total is more than 21.

According to the relationship between the density d1 of the portion of the ridge 4 and the density d0 of the main body of the foamed molded article 1, the density d1 is smaller than the density d0 and d0 / 12.5.
It has also been found that it is preferable to set the density d1 of the portion of the ridge 4 to a larger value, that is, d0 ≧ d1 ≧ d0 / 12.5, since an appropriate strength and cushioning property can be obtained. In order to form the density d1 of the ridge 4 in this manner, the condition of the inverted V-shaped groove 51 in which the ridge 4 is formed in the above-described mold is set within the above-described range. This can be achieved by:

[0017]

As described above, the foamed molded article having the sealing function of the present invention is constituted as described above, so that it is not necessary to form the seal portion by a manual operation such as pasting a conventional sealing tape. Labor and cost reduction,
Further, the ridge portion having the sealing function of the present invention is formed from the same component of the foamed plastic material as the foam molded body main portion, so that it does not peel off, retains the sealing function, absorbs noise and vibration, and the like. There is an excellent effect that the service life is long as in the case of the main body. Therefore, the present invention
As a foam molded article having a sealing function that has solved the conventional problems, there is an extremely large industrial value.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a main part showing a variation of a cross-sectional shape of a ridge according to the present invention.

FIG. 2 is a sectional view of a main part for describing one embodiment of the present invention.

FIG. 3 is a perspective view of a main part of a foam molded article duct member for explaining a conventional sealing structure.

FIG. 4 is a sectional view of a main part of FIG. 3;

[Explanation of symbols]

1 foam molded article, 11 ventilation path, 12 opening, 2 partner member, 22 opening, 4 ridges, 41 ridges, 51 inverted V-shaped concave groove, 52 tip part 6 foamable plastic particles.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yutaka Nishida 2-25 Komaba-cho, Nakatsugawa-shi, Gifu F-term in Daisen Industry Co., Ltd. (Reference) 3J040 AA11 BA05 EA03 FA08 HA03 HA05 HA21 3L080 AB02 AB07 AD02

Claims (3)

[Claims] 1. A foam molded article having an air passage formed therein such that an opening of the air passage is connectable to an opening of a counterpart member, wherein the foam molded article is fixed around an opening of the foam molded article. A foam molded article having a sealing function, characterized in that a ridge having a height of is formed integrally with the foam molded article body simultaneously with molding of the foam molded article body. 2. The molded foam having a sealing function according to claim 1, wherein the cross-sectional shape of the ridge is a triangle having a vertex at the top. 3. The foam molded article having a sealing function according to claim 2, wherein the apex angle of said triangle is set to 28 degrees or more.