A kind of method for preparing automobile noise-reducing felt

Abstract

The invention relates to a method for preparing a noise reduction felt for an automobile, and belongs to the technical field of manufacture of automobile interior trimming parts. The preparation method of the noise reduction felt for the automobile comprises the following steps of: firstly opening and mixing with artificial fiber yarns, regenerated cotton fiber yarns and broken foam particles directly as raw materials; and carrying out steps of vacuum absorption preforming, steam drying temperature heating, cold pressing, solidifying and forming, excess material punching or water cutting and the like in sequence, thus producing an integrated conformal felt. The technology is high in production efficiency; and the produced felt has good environment-friendly property and good comprehensive acoustic NVH (noise, vibration and harshness) performance, and meets index requirements of limousine cars on environment-friendly property and the like.

Description

technical field [0001] The invention relates to a method for preparing an automobile noise-reducing felt, in particular to a new manufacturing method that can be used to make car felts with different thicknesses in different regions but with a uniform body density through a molding process according to the shape of the automobile sheet metal, belonging to the automotive industry. Technical field of interior parts manufacturing. Background technique [0002] The traditional manufacturing method of domestic automobile noise reduction felt is generally to use mixed cotton, spun cotton and phenolic resin to make felt sheets with different sizes and specifications and the same surface density. After heating the material, it is molded and solidified to form a felt product. . [0003] Felt products made by traditional manufacturing methods generally have a thickness below 25mm. When the thickness exceeds 25mm, it is necessary to make a felt patch separately as a supplementary mate...

AI Technical Summary

Problems solved by technology

[0003] Felt products made by traditional manufacturing methods generally have a thickness below 25mm. When the thickness exceeds 25mm, it is necessary to make a felt patch separately as a supplementary material for the thickness area above 25mm. Adhesives are used to bond the supplementary material and the main material together. , resulting in many production processes and high production costs for a single piece of cotton felt

[0004] When the traditional manufacturing method is used to make felt, the raw material is sheet cotton felt, and its elongation is limited. When the cavity depth of the target product exceeds 300mm or the transition of the shape is complicated, and there are multiple layers of turning, the cotton felt product will appear loose or loose. Unable to form the set shape

[0005] When using traditional manufacturing methods to make felt, since the surface density of the raw cotton felt sheet is set according to the weight of the material required for the thickness of the product with the largest area percentage, this thickness is generally 20mm, and in the thinner area of ​​the product, The design thickness is generally only 2~3mm, and the cotton felt sheet is difficult to be extruded to such a thickness, and the felt is prone to rebound deformation after forming, so the thickness of these areas is difficult to meet the design accuracy requirements

[0006] When traditional manufacturing methods are used to make felt, the size of the raw material is designed according to the maximum outer dimension and the regular outline shape, but most of the products produced have irregular outlines, and some peripheral areas do not need materials, so the traditional method produces a lot of felt residue, and Difficult to recycle, high cost of raw materials

[0007] For felts made by traditional methods, the acoustic performance of felt products is generally designed according to the requirements of the maximum and minimum thickness, while the thickness distribution of felt products changes continuously from small to large, and the acoustic performance of the entire product is determined by the entire product rather than by the maximum alone. The minimum thickness is determined, therefore, it is difficult to optimize and balance the cost and performance of felts designed by traditional methods

[0008] Felt made by traditional methods, due to the use of phenolic resin as a binder, the VOC performance of the product is difficult to reduce

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