Cloth material infiltration system

Abstract

The invention relates to a cloth material infiltration system. The system comprises a preimpregnation device used for carrying out primary preimpregnation on cloth materials, a glue dipping device used for carrying out secondary preimpregnation on the cloth material and a first guide roller located between the preimpregnation device and the glue dipping device. The cloth material infiltration system is used for enabling the cloth material to be infiltrated with liquid-state rein, continuous work is above seven hours, in the midway, the system does not need to be shut down for replacing of rubber, the infiltration effect is good, particularly, the system is used for enabling the glass fabric to be infiltrated with the liquid resin, the glass fabric is preimpregnated through the preimpregnation device and secondarily infiltrated through the glue dipping device and then is dried into a PP piece, the appearance quality of the PP piece is high, the probability that defects of micro bubbles,woven show, needle holes and the like appear in the PP piece is low, the yield of the PP piece exceeds 98.5%, glue used by the preimpregnation device and the glue dipping device can be selected fromthe same batch of glue, two batches of glue with different kinds of initial viscosity do not need to be prepared, and time and labor are saved.

Description

technical field [0001] The invention relates to a wetting system for cloth-like materials, which belongs to the technical field of chemical processing. Background technique [0002] Prepreg is a resin matrix impregnated with continuous fibers or fabrics under strictly controlled conditions to make a composition of resin matrix and reinforcement. Reinfiltration after prepreg helps to improve the infiltration effect, which belongs to the technical field of chemical composite materials common process. [0003] The impregnation system is widely used in the PCB industry. For example, the PP (prepreg) used in the field of copper clad laminates is to impregnate paper or fiber fabric sheet materials and glass fibers and other materials with liquid resin, and heat and dry the reinforced material impregnated with resin. into PP; when the reinforcing material passes through the impregnation tank, due to the continuous operation, the contact time between the reinforcing material and th...

AI Technical Summary

Problems solved by technology

[0003] The impregnation system is widely used in the PCB industry. For example, the PP (prepreg) used in the field of copper clad laminates is to impregnate paper or fiber fabric sheet materials and glass fibers and other materials with liquid resin, and heat and dry the reinforced material impregnated with resin. into PP; when the reinforcing material passes through the impregnation tank, due to the continuous operation, the contact time between the reinforcing material and the liquid resin inside the impregnation tank is short and the contact is insufficient. Even if a prepreg tank is added before the impregnation tank, The liquid resin cannot fully penetrate the reinforcing material in a short period of time. Since the reinforcing material has a porous structure, a large amount of tiny gas will remain inside the liquid resin attached to the surface of the reinforcing material to form small bubbles. , pinholes and other quality defects, which lead to related quality hazards inside the copper-clad laminate during the subsequent hot-press curing process, especially when using copper-clad laminates to produce multi-layer circuit boards, defects such as short circuits, open circuits, and insulation degradation are prone to occur

[0004] Even if the prepreg tank is added in the front process of the dipping tank to double the contact time between the reinforcement material and the liquid resin, because the air bubbles between the reinforcement material and the liquid resin are not easy to discharge, and the gap between the reinforcement material and the liquid resin There is not enough pressure between them to make them fully contact, causing PP to be prone to defects such as micro-bubbles, weaving, and pinholes, thereby limiting the pass rate of PP (the pass rate of PP does not exceed 79%, such as Guangdong Shengyi Technology Co., Ltd. Pass rate for FR4 type PP)

At present, some manufacturers have increased the liquid level of the liquid resin (doubled or even tripled on the original basis) so that the liquid resin at the bottom of the impregnation tank has sufficient pressure to contact the reinforcing material, although this can ensure reinforcement. The material and the liquid resin can fully contact, but because the liquid level is very high, it is more difficult to discharge the air bubbles. Although the final pass rate of PP has increased, it usually does not exceed 83%, and the liquid resin level will increase significantly. production costs, the method does more harm than good

Some manufacturers modify the dipping tank so that the upper part of the dipping tank is in a negative pressure state (the air pressure in the upper space of the dipping tank is less than atmospheric pressure), and the use of negative pressure helps to quickly discharge the air bubbles between the reinforcing material and the liquid resin , this method can make the qualified rate of PP reach more than 88% in the early stage, but in the later stage, due to the rapid volatilization of the organic solvent in the liquid resin located on the upper layer, the viscosities of the liquid resin at different liquid levels in the dipping tank are different. The same and very different, the huge difference in viscosity and the negative pressure cannot remove the air bubbles 100%, usually after 60 to 80 minutes of production, it is necessary to stop the machine to replace the liquid resin inside the impregnation tank, otherwise the pass rate of PP will drop to Below 77%, this method is not suitable for continuous production of PP

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