Insulated Fiberglass Sheet Production Process Introduction:
Cutting, laminated, put them into the mold, hot pressing, cooling, demoulding, after treatment, inspection and finished product
1). The cutting and laminated. According to the plate specifications and press table size, adhesive tape is cut into a certain size stacked in neat, classification. Storage room conditions shall be as follows: room temperature 20 ~ 25 degrees, relative humidity 40% ~60%, the purpose is to prevent an increase in volatile and not soluble resin content. Willcut good tape according to the shop floor design order of the rubberized fabric folded plates together.
2). The discharge mode. Between the heating plate of the folded good tape pushing multi-layer press.
3)The hot pressing. The hot pressing process is that the resin melt flow further penetrates into the reinforced material, and make the molding resin curing. For the preheating stage, middle stage, heat preservation heating stage, hot insulation stage.
A. The preheating stage is the folded good tape from room temperature to rise to the resin starts to crosslinking reaction temperature, then the tree on purpose begins to melt and to further penetrate into the reinforced material, also part of volatile matter exclusion. An applied pressure of full pressure of 1 / 3 to 1 / 2.
B. Intermediate insulation stage is to make the resin crosslinking curing reaction to lower reaction rate while maintaining the temperature constant until overflow material can not be drawn into wire.
C. heating stage is the temperature and pressure of the increase to the maximum, resin flow rate decreased, high temperature and high-pressure conditions can increase the crosslinking reaction. This stage focuses on controlling the ascending velocity and pressure wet. The heating speed is too fast, the product can appear crack and delamination phenomenon.
D. The hot insulation stage is to keep the temperature constant in a certain temperature and pressure, the medium main purpose is to make the cross-linking curable resin full reaction.
The various stages in the process of hot pressing temperature and heat preservation time depends on the epoxy adhesive liquid curing properties and heat transfer rate.
4). The cooling and demoulding. After crosslinking curing molding, cold water cooling temperature gradually reducing, to maintain constant pressure in the cooling at the same time. Temperature lower than 50 DEG C after unloading pressure, demoulding. If relief is premature, plate easy to bubble, warping.
5). After the deal. In order to improve production efficiency, speed up the turnover, usually in a hot press curing to only the basic shape. After stripping on 120 ~ 130 DEG C oven after treated for 48 ~ 72h, in order to improve the degree of cure, reduce stress, improve the plate heat resistance, strength and dielectric properties.