JPS58110240A - Asphalt sheet and its use - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an asphalt sheet and a method for using the same [INL
, Detail L< relates to an asphalt sheet that prevents blistering, sagging, and peeling of the asphalt sheet and allows heat-sealing M&L of panels, and a method for using the same.

(1) Conventionally, asphalt sheets have properties such as adhesiveness, Mi-resistance, waterproofness, impact resistance, and electrical insulation, so they are used as building materials or various vehicle VA]. It is used as a covering material for panels of electrical appliances, and serves the purpose of soundproofing and damping.Specifically, in the manufacture of automobiles, etc., for the purpose of soundproofing and damping, Before assembling a vehicle body, it is common practice to heat-seal an asphalt sheet with a thickness of approximately 1 to 4 inches to the vertical (concave and convex) panels of the vehicle body, such as the back panel and dash panel.

Figure ii is a process diagram showing a specific example of covering a conventional panel with an asphalt sheet, and (a) shows the state before heating (
1)) shows the state after heating, with numeral 1 representing the panel, 2 representing the convex portion of the panel, 5 representing the asphalt sheet, and 4 representing the gap (air pocket). As shown in FIG. 1(a), by covering the asphalt sheet 3 on the panel 1 having the panel convex portion 2 and heating it, as shown in FIG. 1(1), (2) The asphalt sheet 3 is heat-sealed to the panel convex portion 2 and the bar 2° 1. However, in this case, it is difficult to bring the asphalt sheet filter into complete contact with the entire surface of the panel 1 having the panel convex portions 2, and gaps 4 remain here and there. The air in this gap 4 thermally expands in a drying oven for painting, which is a subsequent process, and causes defects in appearance and function such as blistering, sagging, and peeling of the asphalt sheet 3.

To prevent this, the following methods are used. That is, Fig. 2 is a process diagram showing an example of covering an asphalt sheet on a panel by improving the method shown in Fig. 1.
a) is the state before heating, (b) is the state after heating, (
a)' and (b)1 show plan views of (a) and (b), respectively. Reference numbers 1, 2 and 3 have the same meanings as shown in FIG. 1, 5 indicates a slit, 6 indicates a hole in the slit, and 7 indicates an enlarged hole in the slit. This method is shown in Figure 2 (
As shown in a), the asphalt sheet 3 has slits (
(5) As shown in FIG.・Heat-seal to Le 1. However, in this case, although the generation of the gap 4 as shown in FIG. 1(b) can be prevented, as shown in FIG. The effect of preventing transmitted sound is insufficient.

An object of the present invention is to solve the above-mentioned drawbacks and provide an asphalt sheet that can be heat-sealed onto an uneven panel without causing blistering, sagging, peeling, etc., and a method for using the same. That's true.

To summarize the present invention, the asphalt sheet for panel covering having uneven portions of the present invention (invention of the first inspection) has a target diameter of about 1 to 2 m at intervals of about 10 to 201111 on the entire surface of the asphalt sheet. In addition, the method of using the asphalt sheet for panel covering (second invention) for forming uneven parts according to the present invention is to provide holes at intervals of about 10 to 20 vLM on the entire surface. Make a hole about 1 to 2 inches in diameter (
4) The asphalt sheet for covering a panel provided with the above is thermally fused onto a panel having an uneven portion to cover the panel.

As a result of intensive studies to solve the problems of each of the above-mentioned methods, the inventor of the present invention has found that the purpose can be achieved by providing small holes of specific dimensions at specific intervals in an asphalt sheet, and has arrived at the present invention. This is what I did.

As mentioned above, the asphalt sheet for covering panels is
Generally, a hole with a thickness of about 1 to 4 mm (usually about 3 mm thick) is used, and when making a hole for the above purpose, it is appropriate that the hole size is about 1 to 2 inches in diameter. The shape of the hole is not particularly limited. If this dimension is too large, the strength will be reduced, and if this dimension is too small, the effect will be insufficient.

It is not desirable to increase the size of this hole because it will be filled during the heat flow and will have the effect of preventing sound transmission after welding.

Father, these holes are about 10 to 20111 times apart! If this interval is too small, the effect of air removal will be lost, and if it is too small, the temporary holes in the asphalt sheet will not be completely filled and the sound transmission prevention effect will be reduced. decreases.

Although the dimensions of the ROE holes vary depending on the thickness of the asphalt sheet, it is generally desirable for practical purposes that the ratio of the old diameter/thickness of the holes be about 10 to 1.

In carrying out the present invention, asphalt is formed into a sheet, and holes are formed in a predetermined size and at a predetermined interval and punched into a product mold (predetermined size and shape). This is placed on the panel of the adherend and heated at about 150° C. for about 50 seconds to thermally fuse the asphalt sheet. By using an asphalt sheet with multiple holes like this, it adheres well to the irregularities of the panel, and air also escapes through the holes, preventing problems such as blistering, sagging, and peeling. .

Next, the present invention will be specifically explained with reference to the drawings. That is, FIG. 3 is a process diagram showing one example of coating an asphalt sheet on a panel according to the present invention (6), in which (a) shows the state before heating, and (b) shows the state after heating. 1.2 and 3 have the same meaning as shown in FIG. 1, and 8 indicates a hole. As shown in FIG. 3(a), an asphalt sheet 5 on which a plurality of sixes 8 of a predetermined size are provided at a predetermined interval is placed over the panel 1 having the panel convex portion 2, and the stiffness is heated. As shown in the figure (lx,), the asphalt sheet 5 is heat-sealed to the panel protrusion 2 and the panel 1. In this case, since air escapes from the holes, the asphalt sheet 3 is completely adhered to the panel protrusion 2 and the entire surface of the panel 1, without creating any gaps, and the holes 8 of the asphalt sheet 30 are temporarily filled with heat flow, causing blisters and sag. and no peeling was observed.

As explained above, according to the present invention, it is possible to heat-seal an asphalt sheet onto a panel having a gate protrusion without causing blistering, sagging, or peeling, and in a completely adhesive state with no gaps. The soundproofing and vibration damping effects can be fully demonstrated.

[Brief explanation of the drawing]

(7) Figure 1 is a process diagram showing a specific method of covering asphalt sheets onto panels; Figure 2 is a process diagram showing a method of covering conventional panels with asphalt sheets, which is an improvement on the method shown in Figure 1. FIG. 3 is a process diagram showing a specific example of covering a panel with an asphalt sheet according to the present invention. 1...Panel 2...Panel convex portion 6...Asphalt sheet 4...
...Gap 5...Slit 6
・・・・・・Mekle of slit 7・・・・・・Enlarged hole of slit 8・・・・・・ Hole patent applicant Chair! Jidosha Co., Ltd. Agent Hiroshi Nakamoto Agent Akira Bengami (8)

Claims (1)

[Scope of Claims] (11) An asphalt sheet for panel covering having an uneven portion, characterized in that holes of 1 to 2 inches in diameter are provided at intervals of about 10 to 20 holes on the entire surface of the asphalt sheet. ( 2) An asphalt sheet for covering a panel with holes of about 1 to 2 m1I in diameter at intervals of about 10 to 20 m111 on the entire surface is thermally fused onto a panel having uneven parts to cover the panel. How to use an asphalt sheet for covering panels with