Molding is one of the most common methods of PTFE molding, which is commonly referred to as moulding, compaction and compression.
The plastic material of powdered (pressure-plastic powder, granular or fibrous) was added into the molding mould to soften and deform, filling the mould under pressure, pressing the closed mold to make it solidified, and then the plastic product was obtained. As the oldest old molding method, molded molding has obvious advantages, such as small loss of raw materials, stable deformation performance, low cost of moulds, good reusability, high production efficiency, automatic production and so on. With black and white, its disadvantages are also difficult to avoid, low dimensional precision, large manual labor after molding, large demand for mould, and certain technical requirements for filling die.
Polytetrafluoroethylene (PTFE) molding process can be divided into the following 12 types according to the physical state of reinforced materials and moulding materials:
(1) fiber moulding and
(3) fabric moulding.
(4) lamination molding.
(5) winding moulding.
(6) sheet plastic moulding.
(7)Preformed billet moulding method.
(8) directional auxiliary moulding.
9) molded powder molding method.
(10) adsorption preformed billet moulding method.
(11) Moulding method for ball-shaped moulded plastics.
(12)Moulding method for felts.
The PTFE resin used in the synthesis of polytetrafluoroethylene molded products requires a good wettability of 1 to the reinforcing material so as to form a good adhesive at the interface between the synthetic resin and the reinforcing material with proper viscosity and good fluidity, Under the compaction condition, the whole cavity can be filled uniformly with the reinforcing material under the pressing condition, and the curing rate is suitable, and no by-products or by-products are produced in the curing process, and the volume shrinkage is small.It can meet the specific performance requirements of moulded products. According to the above selection requirements, common synthetic resins are: unsaturated polyester resin, vinyl resin, silicone resin, polybutadiene resin, allyl ester, melamine resin, polyimide resin and so on. In order to make the moulded products meet the specific performance index, the corresponding auxiliary materials, fillers and pigments should also be selected after the selection of resin varieties and grades.
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