Application: The glass cloth produced in my country is divided into two types: alkali-free and medium-alkali. Most of foreign countries are E-GLASS alkali-free glass cloth. Glass cloth is mainly used to produce various electrical insulating laminates, printed circuit boards, various vehicle bodies, storage tanks, boats, molds, etc. Medium-alkali glass cloth is mainly used for the production of plastic-coated packaging cloth and for corrosion-resistant occasions. The characteristics of the fabric are determined by fiber properties, warp and weft density, yarn structure and weave. The warp and weft density is determined by the yarn structure and texture. The density of warp and weft plus the yarn structure determines the physical properties of the fabric, such as weight, thickness and breaking strength.
Advantages: high tensile strength, good electrical insulation performance, dimensional stability, high temperature resistance, is a good reinforced insulation material, and has been widely used in electrical insulation for decades. Glass fiber cloth uses glass fiber yarns as warp and weft yarns and is interwoven on a loom. Compared with glass fiber paper with random fiber distribution, it has the advantages of high fiber density, high strength utilization, and good dimensional stability. Fiberglass cloth is the main raw material for high-quality tube-covered panels.
Copper Clad Laminate
Copper Clad Laminate (full name Copper Clad Laminate, CCL in English) is a kind of wood pulp paper or fiberglass cloth as a reinforcing material, impregnated with resin, covered with copper foil on one or both sides, and formed by hot pressing The product, as shown in Figure 1 shows the structure of the copper clad laminate.
Copper clad laminate is the basic material of the electronics industry, mainly used in the processing and manufacturing of printed circuit boards (PCB), which are widely used in electronic products such as televisions, radios, computers, computers, and mobile communications.
Copper clad laminates available on the market, considering the base material, can be divided into the following categories: 1. Classification of CCL paper substrates
2, glass fiber cloth substrate
3, synthetic fiber cloth substrate
4, non-woven fabric substrate
5. Composite substrate and others.
The so-called base material refers to reinforcing materials such as paper or glass cloth. If classified by shape, it can be divided into the following 4 types:
1. Copper clad laminate: refers to substrates such as paper and fiberglass cloth, impregnated with resin to make a bonding sheet (adhesive paper and tape). After combining several bonding sheets, one or both sides are equipped with copper foil , After hot pressing and curing, a plate-shaped product made.
2. Shielding board: refers to a copper clad laminate with a shielding layer or graphic circuit in the inner layer. As long as the lines on both sides are processed, a multilayer circuit board can be formed. Also called "copper clad laminate with shielding layer".
3. Multilayer board materials: refers to the copper clad laminate and adhesive sheet (adhesive cloth) used to make multilayer circuit boards. It also includes resin-coated copper foil (RCC) for build-up multilayer boards. The so-called multi-layer board refers to a circuit board with several layers of patterned circuits on two surfaces and inside.
4. Special substrate: refers to the special board of laminates, metal core substrates, etc. used in the additive method, which are not included in the above-mentioned types of plates. Metal core substrates also include resin-coated substrates (FBC, etc.).
The oil seal is a mechanical element used to seal oil (oil is the most common liquid substance in the transmission system, and also refers to the general liquid substance). It isolates the parts that need to be lubricated in the transmission parts from the output parts, and does not allow lubrication Oil leaks. Static seals and dynamic seals (generally reciprocating motion) use seals called seals. The representative form of the oil seal is the TC oil seal, which is a double lip oil seal with a self-tightening spring covered with rubber. Generally speaking, the oil seal often refers to this TC skeleton oil seal.
Oil seal materials: The commonly used materials for oil seals are: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene, etc. When selecting the material of the oil seal, the compatibility of the material to the working medium, the adaptability to the working temperature range and the ability of the lip to follow the rotating shaft at high speed must be considered. Generally, the temperature of the lip of the oil seal is 20~50℃ higher than the temperature of the working medium when the oil seal is working, so care should be taken when selecting the oil seal material. For details, please refer to: Rubber types and characteristics. The working range of the oil seal is related to the material used in the oil seal: -40~120℃ when the material is nitrile rubber (NBR), -30~180℃ for acrylic rubber (ACM), and -25~300℃ for fluorine rubber (FPM).
Oil seal use: engine: crankshaft-crankshaft front and rear oil seal valves-valve oil seal (engine repair kit o-ring) (distributor oil seal, water pump oil seal, balance shaft oil seal, oil pump oil seal...); camshaft - Camshaft oil seal; Transmission: transmission--transmission front and rear oil seals shift lever oil seal (transmission repair kit o-ring) (transfer case--transfer case front and rear oil seal); rear axle: half shaft--rear half Shaft oil seal differential--(front) rear angle vector oil seal, rear wheel oil seal, front wheel oil seal, direction oil seal (steering gear repair kit o-ring), direction booster oil seal (front axle oil seal). All parts that have liquid lubricating oil in the running body box and are connected to the outside need oil seals. Some are rubber, some are metal, and most are steel-bonded rubber, such as the crankshaft rear oil seal, the front and rear oil seals of the gearbox, the left and right half shaft oil seals, the front oil seal of the final drive, and the air compressor crankshaft oil seal.