초록 ▼

Disclosed is a process for producing a composite tubular member of two or more plastic materials. The product tubular member is leach and acid resistant and has inner and outer layers of thermoplastic material and an intermediate layer of a thermosetting resins. The process comprises the steps of: d

Disclosed is a process for producing a composite tubular member of two or more plastic materials. The product tubular member is leach and acid resistant and has inner and outer layers of thermoplastic material and an intermediate layer of a thermosetting resins. The process comprises the steps of: disposing a first layer of a thermoplastic material about a heated winding element for forming the inner layer, wherein the first layer is formed of polyvinylidene fluoride; fusing overlapping adjacent edges of the layer of polyvinylidene fluoride; disposing a second intermediate layer of a thermosetting resin about the inner layer of polyvinylidene fluoride; disposing a third outer layer of polypropylene about the second layer of the thermosetting resin; and fusing the outer layer of polypropylene to the intermediate and inner layers of the thermosetting resin and the polyvinylidene fluoride, respectively.

대표청구항 ▼

A process for producing a composite plastic tubular member of two or more plastic materials, said tubular member being leach and acid resistant and having inner and outer layers of different thermoplastic materials and an intermediate layer of a thermosetting resin, said process comprising the steps

A process for producing a composite plastic tubular member of two or more plastic materials, said tubular member being leach and acid resistant and having inner and outer layers of different thermoplastic materials and an intermediate layer of a thermosetting resin, said process comprising the steps of: (a) disposing a first layer of a thermoplastic material about a heated winding element for forming said inner layer, said first layer of thermo-plastic material being polyvinylidene fluoride; (b) fusing overlapping adjacent edges of said first layer; (c) disposing a second intermediate layer of a thermo setting resin about said inner layer of polyvinylidene; (d) disposing a third outer layer of a thermoplastic material about said second layer, said third layer of thermoplastic material being polypropylene; (e) fusing said outer layer of polypropylene to said first layer of polyvinylidene fluoride and said second layer of the thermosetting resin.