JPH0263703A - Manufacture of high elastic sound insulating material for automobile - Google Patents

Abstract

PURPOSE:To raise a noise insulating property by using one or two kinds of fibre, natural fibre, reproduced fibre and the like, and mixing slab urethane chips therewith at a specific rate, at the same time opening them by means of an opener, and then diffusing uniformly a liquid urethane adhesive agent in spraying after putting them in an agitator, and finally heating and curing them, filling them in a mold in a specific density. CONSTITUTION:A material mixed with the opened fibre or the like of natural fibre, reproduced fibre, synthetic fibre, waste cotton of spinning or cutting chips and the like, or single material is weighed and put on the feed-lattice 1 in a uniform thickness. In the next place, the urethane chips made by crushing slab urethane sheets and slab urethane wastes is weighed to be a rate of 20 - 40% in previous fibre weight ratio, and distributed and laminated on the fibre in a uniform thickness. After that, through the operation of a fibre opener 2, the fibre is uniformly blended, while it is being opened, with the urethane chips. The blended materials are inputted into an agitator 4 by means of a suction fan 3, and they are agitated uniformly while a liquid urethane adhesive agent of 20 - 40wt.% is being sprayed from a spraying device 5 to the blended materials. Next, the adhesive agent blended material is filled into a mold 6. The mold filling density is made to be from 0.025 to 0.07g/cm<3>, and the adhesive agent is cured by high temperature steam or high temperature hot-air.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an insulator dash or an insulator dash placed on the floor of a vehicle interior to block noise generated from outside the vehicle interior such as engine sound, tire noise, exhaust noise, etc. The present invention relates to a method for manufacturing a floor silencer.

[Prior Art] Recycled felt has been commonly used as a backing material for insulator dashes or floor silencers. However, recycled felt has the drawbacks of low rebound resilience and large permanent deformation due to repeated compression, and furthermore, has insufficient sound absorption properties. In this respect, urethane foam has the advantage of having a high rebound modulus and low permanent deformation due to repeated compression, but has the disadvantage of extremely poor air permeability.

[Object of the Invention] The present invention has been made in view of the above, and its first purpose is to improve its sound insulation properties. The second purpose is to improve properties such as air permeability, rebound modulus, and permanent set. The third purpose is to reduce material costs.

[Means for achieving the object] In order to achieve the above-mentioned object, the method for producing a highly elastic sound insulating material for automobiles of the present invention uses fibers obtained by defibrating natural fibers, recycled fibers, synthetic fibers, or cut waste cloth, etc. - Use a pin or garnet cylinder type defibrator to uniformly mix slab urethane chips with a mesh size of 2 to 10 mm at 20 to 40% by weight of the fibers, and defibrate at the same time. into a stirrer, and spray a liquid urethane adhesive with a mixed material ratio of 20 to 40 percent by weight to uniformly spread it, and then apply it to the mold required for each part at a rate of 0.025 to 0.01 g/ci. The present invention is characterized by a method for producing a highly elastic sound insulating material for automobiles, which comprises filling the liquid urethane adhesive with a density of 100% and solidifying the liquid urethane adhesive with high-temperature steam or high-temperature dry heat.

Furthermore, the second invention uses one or more kinds of fibers defibrated from natural fibers, regenerated fibers, synthetic fibers, or cut H cloth, and the particle size is reduced to 2 by using a pin or garnet cylinder type defibrator. Slab urethane chips with a mesh size of ~10 mm are uniformly mixed at 20 to 40% by weight of the fibers and simultaneously defibrated.

Next, this is put into a stirrer, and a liquid urethane adhesive with a mixed material ratio of 20 to 40% by weight is sprayed and uniformly dispersed, and then it is sandwiched between a pair of endless conveyors to make a 0.025 to 0.00% by weight liquid urethane adhesive. The present invention provides a method for continuously producing a flat plate-like highly elastic substrate by performing wet heat or dry heat treatment while maintaining a density of 0.07 g/Cil+.

[Embodiment] Next, an embodiment of the first invention will be described with reference to FIG. A mixture of natural fibers, regenerated fibers 5 synthetic fibers, defibrated fibers such as lost cotton or cutting waste from spinning, or a single material is weighed at a predetermined weight into the feed latch 1 of a pin or garnet cylinder type defibrator to create an even thickness. I'll put it on. Next, urethane chips made by crushing a slab urethane sheet or slab urethane waste (both are open cells) to a suitable particle size of 2m to 10m mesh are added to the fiber weight ratio of 20
It is weighed so as to have a ratio of ~40%, and placed on the feed latches of the defibrator, and then distributed and laminated on the fibers so as to have an even thickness. After that, the fibrillator 2 is operated to fibrillate the 1w&fiber and uniformly mix it with the urethane chips. This mixed material is introduced into the stirrer 4 by air blowing by the material conveying suction fan 3 or by other methods,
The stirrer was operated while spraying an appropriate amount of liquid urethane adhesive (solvent type or emulsified type) of 20 to 40% by weight relative to the amount of mixed material input from the spray device 5 installed on the top of the stirrer. , spread the adhesive evenly into the mixed material. The appropriate processing time varies depending on the structure of the stirrer and the processing conditions, but long-term processing is undesirable as the fibers become entangled and form lumps, so it is necessary to keep the processing time at most 10 minutes or less, and the preferred time is 1.0 to 4 minutes.゜0 minutes. The adhesive spray mixture that has been stirred and mixed is directly filled into a mold 6 of the shape required for each interior component to the required appropriate density, or the mixture that has been stirred and mixed is again filled with a pin or garnet. In some cases, mold filling is performed after improving the degree of defibration and uniform dispersion of the adhesive through the cylinder one-type defibrator 7. This is determined by the required quality of the nine parts of the automobile interior parts, but the latter naturally improves both the external quality and physical properties of the parts.

The mold packing density varies depending on the required characteristics of the part, but is 0°025
From 0.01g/a+! is appropriate. After filling the mold, the adhesive is solidified using high-temperature steam or high-temperature dry heat to produce a highly elastic soundproofing material.

In addition, to explain the manufacturing method of the flat highly elastic base material according to the second invention according to FIG. 2, firstly, a fleece is made from the mixed material after stirring and mixing using a random unit bar 10, and then the fleece is punched into a fleece. Or, it is inserted between a pair of endless conveyors 8, 8, such as a wire net conveyor, and the gap (thickness) of the conveyor is adjusted, and 0.0
This is processed in a wet heat type or dry heat type dryer 9 while maintaining an appropriate density of 25 to 0.07 g/ci to continuously produce a flat base material.

This highly elastic base material is highly elastic and has excellent properties such as fatigue resistance, breathability, heat insulation, and sound absorption, so it can be used as a sound absorbing material for dash insulators, floor silencers, seat cushions, back cushions, and seats. It can be applied as a base material for automobiles, such as cushion-related fillings, by designing appropriate processing conditions for each.

The following table shows comparative data on the properties of the product of the present invention produced in this way and a conventional base material. Since the test method is based on JIS, detailed explanation thereof will be omitted.

As shown in the table above, the product of the present invention improves the poor breathability of urethane foam, and improves the rebound resilience and air permeability of conventional products (100% fiber) and recycled felt used as backing materials for current insulators or floor silencers. After repeated compression, the permanent set value was improved to 11. Furthermore, the synergistic effect greatly improves the acoustic properties, making it possible to improve the performance of soundproofing materials for automobiles, and reducing material costs by using chips made from slab urethane waste. FIG. 3 shows a comparison of sound transmission loss between the product of the present invention and recycled felt conventionally used as a backing material for insulator dashes and floor silencers. The test method follows JIS A 1416.

[Effects of the Invention] As described above, the high elastic sound insulating material for automobiles of the present invention not only improves sound insulation properties but also significantly improves various properties such as air permeability, rebound modulus, and permanent set due to repeated compression, and reduces raw material costs. There are various beneficial effects, such as reduced costs and the possibility of low-cost production.

[Brief explanation of the drawing]

The drawings show examples of the present invention, and FIG. 1 is a flow sheet diagram of the first invention, FIG. 2 is a flow sheet diagram of the second invention, and FIG. 3 is a flow sheet diagram of the invention product and recycled felt. It is a graph comparing the acoustic characteristics of. DESCRIPTION OF SYMBOLS 1... Feed latch, 2... Defibrator, 3 - Suction fan for material conveyance 54... Stirrer, 5... Spray device, 6... Molding mold, 7... Garnet cylinder one-way solution Textile machine, 8. Endless conveyor, 9. Dryer. Special fee

Claims (2)

[Claims] (1) Use natural fibers, recycled fibers, synthetic fibers, or fibers that have been defibrated from cut waste cloth, etc., and add slab urethane chips with a particle size of 2 to 10 mm mesh to 20 to 40 weight fibers per fiber. At the same time, they are mixed uniformly together and defibrated using a pin or garnet cylinder type defibrator, and then the mixture is put into a stirrer and the mixed material ratio is 20.
~40% by weight of liquid urethane adhesive is sprayed and dispersed uniformly, then filled into molds required for each part at a density of 0.025 to 0.07 g/cm^3, and heated with high temperature steam or A method for producing a highly elastic soundproofing material for automobiles, characterized by solidifying a liquid urethane adhesive using high-temperature dry heat. (2) Using one or more types of fibers defibrated from natural fibers, recycled fibers, synthetic fibers, or cut waste cloth, etc., and using a pin or garnet cylinder type defibrator to create a mesh slab with a particle size of 2 to 10 mm. The urethane chips are uniformly mixed at 20 to 40% by weight based on the fibers, defibrated at the same time, and then put into a stirrer to achieve a mixed material ratio of 20 to 40%.
A liquid urethane adhesive with a weight percentage is sprayed to uniformly diffuse it, and then it is sandwiched between a pair of endless conveyors and subjected to wet heat or dry heat treatment while holding the adhesive to a density of 0.025 to 0.07 g/cm^3. A method of continuously manufacturing a flat plate-shaped highly elastic base material.