Noise isolation sheet

Abstract

There is provided a noise isolation sheet 100 which is installed in a car door comprising a door inner panel 11 and an interior door trim 12. The door trim 12 is provided inside the door inner panel 11. The noise isolation sheet 100 partially or wholly covers the door inner panel 11. The noise isolation sheet 100 is at least a double layer comprising an outer side sheet 101 and an inner side sheet 102. The outer side sheet 101 is a sheet made of a foam body having water absorption of less than 30%, and the inner side sheet 102 is a sheet made of a foam body having water absorption of 30% or more.

Description

[0001] 1. Field of the Invention[0002] This invention relates to a noise isolation sheet provided to cover a panel, e.g., a door inner panel which is installed inside an automobile door.[0003] 2. Description of the Prior Art[0004] As illustrated in FIG. 3, there have been a known method of insulating noise in the interior of a door 60, wherein a felt 2 or urethane is attached to the backside of an interior door trim 1 which is provided to the inner side of a door inner panel, or an urethane-made article is attached to the side of the door inner panel.[0005] For example, the examined utility model application publication No. H5-23375 discloses a door trim which is provided with a pad material made of urethane foam and the like. The published patent application No. H10-119159 discloses a noise isolation cover made of urethane foam.[0006] However, according to the above-described prior arts, the noise insulating effect is not satisfactory because the felt 2, urethane, pad material and ...

AI Technical Summary

Benefits of technology

The invention is a noise isolation sheet for automobiles that is designed to cover a panel inside a door. The sheet is made up of an outer side sheet and an inner side sheet, both made of foam bodies with different water absorption rates. This double-layered sheet prevents water from entering the car and improves the insulation of noise. The sheet is easy to install and lightweight. The technical effect of this invention is to provide a more effective and improved noise isolation solution for automobiles.

Problems solved by technology

However, according to the above-described prior arts, the noise insulating effect is not satisfactory because the felt 2, urethane, pad material and isolation cover are all made independently and they are installed merely partially to the side of the door trim 1 or the inner side of the door inner panel.

Further, they had to be partially installed, so that there was a problem that the installation operation was troublesome.

However, according to the prior art comprising a noise isolation sheet 20, it is likely that water tends to invade from the outside of a car.

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