JPS6024234Y2 - sound insulation carpet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carpet with sound insulating properties, particularly to a carpet suitable as a floor carpet for automobiles.

In the automobile industry, there is a demand for sound-insulating carpets that can protect the interior of automobiles from vibrations and noise caused by engine noise, but conventionally used floor carpets are made of 200% SBR latex or polyethylene on the back side of the carpet. Since it was lined with a weight of about 500 g/m, it did not satisfy the above requirements.

The present invention has excellent sound insulation properties and satisfies various properties required for carpets, especially automotive floor carpets, such as pile sealing properties, waterproof properties, appropriate rigidity, and shape retention after forming or forming. The carpet is made of 20-6% polyethylene or ethylene-vinyl acetate copolymer and 40-8% inorganic filler having an average particle size of 100 microns or less and a density of 2.0 or more. Apply a backing material of 1000 to 40% to the back side of the carpet.
The present invention provides a sound insulating sheet characterized by being laminated in such a manner that the amount of the sound insulating sheet is 0.00 g/d.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The carpet 1 of the present invention consists of a carpet material 2 and a backing material 3 lined on the underside of the carpet material 2.

Although the carpet material 2 is a tufted pile carpet in the figure, it may be a cut pile carpet obtained by cutting loops of this pile, or a needle punch carpet may be used instead of the tufted carpet.

A backing material 3 is laminated on the back surface of the carpet material 2, and the backing material 3 is composed of 20 to 60% by weight of polyethylene or ethylene-vinyl acetate copolymer, an average particle size of 100 microns or less, and a density of 2. A melt-kneaded product containing 40 to 8% of an inorganic filler having a content of 0.0 or more is laminated.

As the above-mentioned ethylene-vinyl acetate copolymer, one having an arbitrary content of vinyl acetate of 5% or less can be used,
In addition, 2% of other polyolefins, polyamides, etc. are added to polyethylene, ethylene-vinyl acetate copolymer.
It can be blended to a certain extent.

Polyethylene and ethylene-vinyl acetate copolymer may be blended in any proportion.

In addition, inorganic fillers include calcium carbonate, magnesium carbonate, barium sulfate, talc, silicic acid, mica,
Iron oxide particle size is less than 100 microns and true density is 2.0
The above are used.

A filling material with a low density will have a small sound insulation effect.

The backing material 3 is coated on the back side of the carpet material 2 with a coating of 1000~
Laminate and back with a thickness resulting in an amount of 4000 g/rrt.

The backing method involves melt-extruding the above-mentioned backing material 3 into a sheet using a known extrusion coating device, applying it to the back surface of the carpet material 2, sandwiching it between a cooling roll and a nip roll, and applying pressure and cooling. The preferred method is to heat the backing material 3, which has been formed into a sheet in advance, on the back side of the carpet material 2, heat it with a heater, melt the backing material 3, and then press and cool it with cooling rolls and nip rolls. be able to.

Since the carpet of the present invention has such a structure, it has excellent sound insulation performance and excellent pile prevention properties, and can also be shaped by reheating the product carpet using steam, a heater, or the like.

Therefore, the carpet is excellent as a floor carpet for automobiles, and is also suitable for use as a carpet in factories, etc., where vibrations are transmitted to other shops.

Examples 1 to 3, Comparative Examples 1 to 4 Ethylene-vinyl acetate copolymer (vinyl acetate content 25% by weight, melt flow index 15 g/10 min) [A
], 80% by weight of calcium carbonate with an average particle size of 1.8 microns and a density of 2.7, and atactic polypropylene (number average molecular weight about 30,000) 20! Mixture with i amount% [
A backing material containing B] in the proportion shown in the table was extruded at 220°C on the back side of the nylon pile carpet.
Extrusion lamination was carried out using the amount of backing shown in the table.

The results of evaluating the sound insulation, rigidity, and shapeability of the obtained carpet lining are shown in the table.

(Examples 1 to 3, Comparative Examples 1 to 3) In addition, low density polyethylene (density 0.918 g/cr
ft.

A backing carpet obtained in the same manner using only a melt flow index of 45 g/10 minutes) is also shown in the table as Comparative Example 4.

*I Measure the sound insulation degree in accordance with JISA1416,
○: Excellent, Δ: Some, ×: None, *20: Moderate, Δ: Soft, ×: Too hard *30: Good, ×: Difficult or time-consuming to form.

[Brief explanation of drawings]

The figure is a vertical cross-sectional end view of the carpet of the present invention. 1... Carpet, 2... Carpet material, 3... Backing material.

Claims (1)

[Scope of utility model registration request] Polyethylene or ethylene-vinyl acetate copolymer 20~
60% by weight and an average particle size of 100 microns or less and a density of 2
．． A backing material consisting of 40 to 80% by weight of an inorganic filler of 1000 to 4000% by weight is applied to the back side of the carpet material.
A sound insulating carpet characterized by being laminated to have an amount of g/-.