JP3480179B2 - Automotive interior materials - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile interior material, and more particularly to an automobile interior material (hereinafter referred to as a ceiling material) capable of reducing vehicle interior noise in order to improve passenger comfort.
Regarding

[0002]

2. Description of the Related Art At present, it is necessary to improve the quietness of the passenger compartment as automobiles become more sophisticated and have higher performance. However, there are few ceiling materials up to now that place importance on sound absorption and sound insulation, and it is generally important that they are inexpensive. As a typical example of these, a felt having a thermosetting binder such as a phenol resin as a wood board or a recycled fiber is used as a core material.

Therefore, in view of the prior art, it is an object of the present invention to provide a ceiling material having a higher sound absorbing / insulating performance.

[0004]

The above objects of the present invention are as follows.
In a vehicle headlining, the present invention is achieved by an interior material for an automobile, characterized in that a double-wall type sound insulation structure is formed by forming a dense layer on at least one of the intermediate layers mainly composed of polyester fiber. It was

In the present invention, as shown in FIG. 1, a dense layer is formed on at least one, and preferably on both sides, of an intermediate layer mainly composed of polyester fiber to obtain a double wall type sound insulation structure. Therefore, the sound insulation performance can be improved. Also, by controlling the weight of the dense layer, it is possible to perform tuning so that it can function most effectively in the frequency range required for the vehicle. Further, by disposing the low spring layer in the intermediate layer, it is possible to reduce vibration transmission and improve sound insulation performance.

Further, the sound absorption performance of the intermediate layer can be improved by controlling the air flow rate of the dense layer. That is, although the sound insulation performance is slightly reduced, the sound absorption performance can be improved. Polyester and the like have excellent sound absorption performance in the high frequency range, but generally have poor performance in the low frequency range, so it is effective to use sound absorption performance and sound insulation performance properly depending on the required performance area of the target vehicle. The ceiling material of the present invention enables tuning for each target vehicle type.

It is desirable to dispose the dense layer on both sides of the intermediate layer. However, when the dense layer is used as an interior material for automobiles, since the vehicle body panel is present in any case, the dense layer is provided on at least one of the intermediate layers. As a result, a double wall structure is obtained, and the above effect can be exhibited. It is desirable to dispose the dense layers on both sides of the intermediate layer, which can have a double wall structure with the interior material alone.

This dense layer is composed of polyethylene terephthalate as a main component and has a fineness of 1 to 50 denier and high melting point fibers 0 to
A core-sheath type composite fiber 40 having a fineness of 1 to 20 denier, which comprises 60% by weight and a core component mainly composed of polyethylene terephthalate and a low melting point elastic polyester sheath component having a melting point of 200 ° C. or less, which comprises polyethylene terephthalate as a main copolymerization component. It is preferable that the thickness is 3 mm or less and the areal density is 200 g / cm ² or more after processing and molding.

When importance is attached to the sound insulation performance, it is preferable to use a polymer film mainly composed of ethylene vinyl acetate, polyester or polyethylene and having a surface density of 50 g / m ² or more as the dense layer.

In the present invention, when the surface density and the thickness of the dense layer exceed the above ranges, a double wall structure having sufficient sound insulation performance cannot be realized. That is, if the dense layer is too thick, it does not function as a wall structure, and if the surface density of the dense layer is too low, sufficient weight cannot be ensured even if the dense layer is thin, and the film itself resonates and causes sound pressure. Will be transmitted.

Further, in the present invention, it is preferable that the dense layer has an air permeability of 0 to 10 cc / cm ² · sec. With a ventilation amount exceeding this range, almost no sound insulation performance can be expected, and the sound insulation properties and sound absorption properties intended by the present invention cannot be achieved at the same time.

Further, in the present invention, it is preferable that a low spring layer is provided in a part of the intermediate layer, and the dynamic spring constant thereof is 90% or less of the dynamic spring constant of the intermediate layer. The reason why the low spring layer is partially provided in the intermediate layer is that by installing the low spring in a portion, a series spring is generated in the intermediate layer, and the low spring in the entire layer can be achieved. Moreover, the reason why it is set to a part is to prevent the rigidity of the ceiling material from being lowered by reducing the spring.

This low spring layer is mainly composed of polyethylene terephthalate and has a high melting point fiber 90 having a fineness of 1 to denier.
A core-sheath composite fiber having a fineness of 1 to 10 denier consisting of 100% by weight and a core component mainly composed of polyethylene terephthalate and a low-melting point elastic polyester sheath component having a melting point of 200 ° C. or less which mainly comprises polyethylene terephthalate as a copolymerization component 0 It is preferably composed of 10 to 10% by weight.

In the present invention, the fiber used is preferably polyethylene terephthalate or a polyester having a component similar thereto as the high melting point polyester fiber because it is inexpensive and desirable. As the copolyester used for the heat-sealing type fiber having a core-sheath structure, an acid component such as terephthalic acid or isophthalic acid, a diol component such as ethylene glycol, propylene glycol or diethylene glycol, or a lactone is ring-opened and copolymerized. It is possible to use the copolyester. Polyethylene terephthalate used for the core or polyester having a component similar thereto is inexpensive and desirable.

[0015]

EXAMPLES The present invention will now be described in more detail by way of examples, which should not be construed as limiting the invention.

Example 1 65% by weight of a normal polyester stable fiber having a circular cross section of 52 denier with an intermediate layer of 13 denier and a heat fusion type polyester stable fiber having a core-sheath structure of 52 denier with a denier of 2 mm (130 ° C. melt type ) 35 wt% was blended, carded, cross-layered and needle punched to obtain a fabric having a basis weight of 600 g / m ² .

Dense layer 13 denier 52 mm long 10% by weight of normal polyester stable fiber having a round cross section and 2 denier 52 mm long thermal fusion type polyester stable fiber having a core-sheath structure (melting at 130 ° C.) 90% by weight % To obtain a raw fabric having a basis weight of 200 g / m ² through the steps of blending, carding, cross layer and needle punching.

The intermediate layer thus obtained was sandwiched between two dense layers, laminated by passing through a needle punching step, further heated to 170 ° C. and press-molded to produce a ceiling core material.

Example 2 Exactly the same as Example 1 except that a layer having a spring constant of 90% of the spring constant in Example 1 was added by mixing 2d of ordinary fibers in the 10% by weight portion of the intermediate layer. Then, a ceiling core material was produced.

Example 3 The basis weight of the dense layer was 300 g / m ² and the basis weight of the intermediate layer was 4.
A ceiling core material was produced in exactly the same manner as in Example 1 except that the amount was set to 00 g / m ² .

Example 4 Example 1 was repeated except that the dense layer was provided only on one side of the vehicle interior.
A ceiling core material was produced in exactly the same manner as.

Example 5 A ceiling core material was produced in exactly the same manner as in Example 1 except that EVA and 50 g / m ² were used for the dense layer.

Example 6 A ceiling core material was produced in the same manner as in Example 1 except that 90% by weight of the fully melted polyester fiber was blended in the dense layer. The ventilation rate of the dense layer was ² cc / cm ² · sec or less.

Comparative Example 1 Polystyrene and an engineering plastic obtained by polymerizing polyphenylene oxide into a polymer were heat-molded to obtain a highly foamed ceiling core material. At this time, the basis weight of the core material was 550 g / m ² .

COMPARATIVE EXAMPLE 2 The dense layer has a basis weight of 100 g / m ² and the intermediate layer has a basis weight of 8
A ceiling core material was produced in exactly the same manner as in Example 1 except that the amount was set to 00 g / m ² .

Comparative Example 3 A ceiling core material was produced in exactly the same manner as in Example 1 except that the EVA film of the dense layer had a basis weight of 40 g / m ² .

Evaluation results Further, tricot 150 g /
A ceiling material of m ² was formed to obtain a ceiling material. The sound absorption coefficient and sound transmission loss of this ceiling material were measured. The results are shown in Table 1.

[0028]

[Table 1]

[0029]

According to the automobile interior material (ceiling material) of the present invention, the noise in the vehicle compartment can be reduced, and the comfort of the occupant can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a double wall structure interior material of the present invention.

[Explanation of symbols]

1 roof panel 2 dense layer 3 Middle class 4 epidermis

Continuation of front page (51) Int.Cl. ⁷ Identification code FI B32B 27/36 B32B 27/36 G10K 11/162 G10K 11/16 A (58) Fields investigated (Int.Cl. ⁷ , DB name) B60R 13 / 02 B32B 5/02 B32B 27/00 B32B 27/12 B32B 27/28 101 B32B 27/36 G10K 11/162

Claims (5)

(57) [Claims] 1. A head lining for automobiles, wherein a dense layer is formed on at least one of intermediate layers mainly composed of polyester fibers to form a double-wall type sound insulation structure, and the dense layer is made of polyethylene terephthalate. 0-60% by weight of a high melting point fiber having a fineness of 1 to 50 denier as a main component,
A core-sheath type composite fiber 40 having a fineness of 1 to 20 denier, which comprises a core component mainly composed of polyethylene terephthalate and a low melting point elastic polyester sheath component having a melting point of 200 ° C. or less and mainly composed of polyethylene terephthalate.
~ 100% by weight, thickness 3mm after processing and molding
An automotive interior material having an areal density of 200 g / cm ² or more below. 2. A head lining for automobiles, wherein a dense layer is formed on at least one of the intermediate layers containing polyester fiber as a main constituent base material to form a double wall type sound insulation structure, wherein the dense layer is ethylene vinyl acetate, An interior material for automobiles, which is a polymer film mainly composed of polyester or polyethylene and having an areal density of 50 g / cm ² or more. 3. The dense layer has an air flow rate of 0 to 10 cc / cm ² ·
The interior material for automobiles according to claim 1 or 2, wherein the interior material is sec. 4. The automobile according to claim 1, wherein a low spring layer is provided in a part of the intermediate layer, and the dynamic spring constant is 90% or less of the dynamic spring constant of the intermediate layer. Interior material. 5. A high melting point fiber 90 having a fineness of 1 to 15 denier, in which the low spring layer is mainly composed of polyethylene terephthalate.
A core-sheath composite fiber having a fineness of 1 to 10 denier consisting of 100% by weight and a core component mainly composed of polyethylene terephthalate and a low-melting point elastic polyester sheath component having a melting point of 200 ° C. or less which mainly comprises polyethylene terephthalate as a copolymerization component 0 It is comprised by 10 to 10 weight%, The interior material for motor vehicles of Claim 4 characterized by the above-mentioned.