Novel method for thermally compounding waterproof breathable sound-transmitting film material and non-woven fabric material to form breathable material

Abstract

The invention discloses a novel method for thermally compounding a waterproof breathable sound-transmitting film material and a non-woven fabric material to form a breathable material. According to the method, the non-woven fabric is preheated, the surface of the non-woven fabric to be bonded is heated to be close to a molten state and sent to a position between two hot pressing shafts, the two materials are compounded and bonded together through small pressure, pressure is reduced compared with a traditional method, and the damage degree of a waterproof breathable film expansion structure is reduced; and the air permeability and audio attenuation of the compounded breathable material are reduced. After hot pressing, due to the fact that non-woven fabric fiber is prone to deformation after being heated and prone to deformation and unevenness if being improperly treated in the cooling process, in the material cooling process, the material is always kept in a straightened flat state without leaving a shaping shaft roller and a cooling shaft, and shrinkage and deformation are avoided all the time. In order to overcome the defects that a breathable film material is prone to longitudinal stretching and narrowing in width in the feeding process, two or more sets of two-wing thread expansion shaping rollers are adopted in the middle, the defect of deformation of the breathable film material is overcome, and the breathable sound-transmitting film is kept flat.

Description

technical field [0001] The invention is applicable to the application field of waterproof materials for smart wearable and communication smart hardware. It is a high-quality deep-water waterproof, breathable and sound-permeable high-quality composite material suitable for these types of electronic consumer products that need waterproof, breathable or waterproof components that meet the human-computer audio interaction transmission. Background technique [0002] In many smart wearable and communication smart hardware products, the waterproof, breathable and sound-permeable membrane materials that play a protective role inside are mostly vulnerable to external liquid intrusion or even impact, that is, under a certain liquid pressure. Depression and deformation to the inner side of the product, and often irreversible deformation, or even burst, resulting in sound distortion, and even water immersion. The sound-permeable membrane materials are combined together to make a compos...

AI Technical Summary

Problems solved by technology

[0002] In many smart wearable and communication smart hardware products, the waterproof, breathable and sound-permeable membrane materials that play a protective role inside are mostly vulnerable to external liquid intrusion or even impact, that is, under a certain liquid pressure. Depression and deformation to the inner side of the product, and often irreversible deformation, or even burst, resulting in sound distortion, and even water immersion. The sound-permeable membrane materials are combined together to make a composite material that can resist the impact of liquid pressure with a certain strength. Among them, non-woven fabric and ePTFE (expanded polytetrafluoroethylene composite material) are the most commonly used, but most composite methods are simply heating rollers through the air-permeable The material transfers heat energy to the non-woven fabric in contact with it under a certain pressure, and the heating roller pressurizes the breathable material and the non-woven fabric while making them stick together, and the heating and compounding time are just two materials rolling in The time between the two pressure shaft rollers on a contact tangent line is such a short time. If the two materials are combined firmly, it is necessary to increase the temperature and pressure of the heating roller to stick the two materials together. The pressure is to make the hot roller transfer more heat to the non-woven fabric through the breathable film so as to reach the melting temperature of the non-woven fabric so that it can be quickly bonded together, because the breathable film material has to withstand high temperature and The consequence of high pressure is that the breathable membrane material greatly loses its original intrinsic properties. After increasing the pressure and compounding, both the fiber structure, pore size, and thickness are subject to huge changes, so that the expansion characteristics of the original bulky material are greatly reduced. Weakening, the gap between the pores shrinks greatly, the air permeability becomes much worse, the characteristics of the air-permeable film material are lost, the air permeability decreases, and the audio characteristics attenuate accordingly

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