Wuhan Handern lamination process
DATE：2020/6/8 8:53:54 / READ： / SOURCE：This station
Wuhan Handern lamination process
1. Dipping and gluing processDipping and gluing is a key process for the advantages and disadvantages of sub-fabricated laminated materials. If the immersion is uneven and the control conditions do not meet the requirements of the process, you will not get good quality products. During the leaching process, the content and distribution of the base material after the tree, the volatile content, the degree of tree sedimentation after drying, the content of the viscous resin and other factors all affect the product quality and cost. www.handern.com Breathable membrane equipment
(1) The degree of curing of the impregnating resin and the influence on the impregnation speed and drying speed during curing are great, because the car is too fast to control, and too slow affects the product. The control of the dryness of the resin is very important. If the dryness is too large, it is not easy to be immersed in the paper or cloth and affect the quality. If the viscosity is too small, the amount of immersion is not enough. It is usually controlled by the amount and temperature of the solvent added. The soaking temperature is better maintained by hot water at 25-30°C. Excessive temperature will increase the amount of solvent volatilization and cause trouble. www.handern.com Permeable membrane equipment for the sub-dip method of dipping, the dipping volume is controlled by the viscosity and the dipping speed: for the squeeze roller type dipping, it is also possible to force the dipping and control by means of the pressing force of the pressing group It can reduce the amount of impregnation and eliminate the air trapped, but when the pressure is too tight, it will break due to the excessive tension of the paper base, and it will also cause uneven coating of the surface of the substrate such as paper and cloth.
(2) The relationship between the control steam pressure, temperature and car distance of the machine is generally controlled. The general steam pressure control is about 0.5-0.7Pa (5-7kgt/cm2). The steam pressure should be based on the specifications and trees of the substrate The turning speed can be adjusted. For example, the fluidity requirement of dip-flow paper (cloth) is small, the curing of resin is slow, and high steam pressure can be used (in fact, the degree of dip paper of phenol tree should not be too high). The vehicle speed is determined according to the length of the resinization time. If the heat setting time is fast, the vehicle should be added far away, otherwise the tree fluidity on the substrate is too small (the content of fusible resin is also small), otherwise the vehicle speed should be slowed down. www.handern.com Breathable membrane equipment
(3) The compressive strength of the controlled-layer laminated product with tree content and probe content is mainly read from the substrate, because other forces are closely related to the resin content. Although the strength of the plant fiber is high, the internal fiber and the fiber lack a combined force, which cannot fully show the common strength. When the resin is impregnated, this shortcoming is compensated. Generally, the resin content is controlled between 30 and 55 (the lamination is 32% 3% and the diallyl phthalate is 40%3). If it is excessive, the moisture and volatiles in the resin will not be easily removed and affect the layering. Electrical insulation performance, etc. www.handern.com Breathable membrane equipment
If the content of the resin in the dipped base material after drying is too high, it will affect the electrical properties and mechanical properties of the product, and it will also cause appearance defects such as surface blistering and edge blooming; the volatile content is too small This will affect the resin fluidity and make lamination difficult.
Usually, the volatile content is measured before drying. For the base material for laminated foil-clad plates, the volatile content is about 2.5%, and if the laminated plates, tubes, rods, etc., it can be controlled at 4 to 6%.
(4) Control of soluble resin content and fluidity Soluble resin refers to a B-stage resin that is still soluble in acetone. If the content is too small, it will affect the adhesion between the substrates and reduce the performance of the finished product; if the content is too large, it will be laminated. When the resin is lost, it will also cause the substrate (especially paper or cloth) to slip and cause waste. Fluidity is a simple judgment indicator for measuring soluble resin content in industrial production.
(5) Abnormal conditions in the dipping and drying process.
① The substrate impregnation amount is uneven. Adjust the viscosity of the resin liquid and the temperature of the dipping tank, adjust the elasticity of the scraper or squeeze roller, and keep the roller distance equal. Pulling the chain mesh of the substrate in the drying room will also cause uneven resin volume. The speed of the vehicle and the tension disc of the winding part should be adjusted to maintain a certain tension of the substrate. www.handern.com Breathable membrane equipment
②The fluidity of the resin on the substrate and the sudden increase of volatiles are due to the steam or electric heating imbalance, especially due to the lack of steam in winter. At this time, the speed should be adjusted down. Generally, the temperature is reduced by 5℃, and the vehicle speed should be slowed by 3～6s/m (cloth base) or 2 (paper base). If the air volume of the air supply air of the drying room is unbalanced, the temperature will also be reduced. At this time, the 3 s/m air valve of the upper and lower air pipes should be adjusted to balance the hot air.
③ There are black spots or black stains on the substrate due to the falling of low-molecular substances and volatiles accumulated on the wall of the entrance and exit of the drying room and the exhaust pipe, and should be wiped clean. www.handern.com Breathable membrane equipment
④Multi-layer film rewinding occurs between the squeeze rollers. The squeeze roller is faster than the take-up roller due to the loose or unwinding of the take-up roller. It may be that the squeeze roller is faster than the take-up roller. Material exit processing.
⑤The film base is suddenly loose and the joint breaks in the drying room. It may be caused by the fast delivery speed of the squeeze roller and the small take-up speed; it may also be that the pressure between the squeeze rollers is adjusted too tight or the single side is tight, and the paper base is particularly easy at this time. fracture. The speed should be adjusted, and the materials in the drying room should be quickly sent out of the drying room for further processing. www.handern.com Breathable membrane equipment
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