61results about How to "Composite process is simple" patented technology

The invention discloses a biaxially stretched polypropylene film for paper-plastic glue-free compounding and a preparation method thereof. The film includes a surface layer, a core layer and a core layer which are arranged in sequence and co-extruded, and can be directly combined with paper materials and pre-printed paper. The composite functional layer of the material or the film containing this layer, the upper surface layer is arranged between the surface layer and the core layer, and the next surface layer is arranged between the core layer and the functional layer. The surface layer, the upper surface layer, the core layer, the lower surface layer and the functional layer are co-extruded by two-way stretching according to the corresponding components. The preparation method of the present invention is as follows: the selected raw materials are fed into the extruder to be plasticized into a melt, and the melt is quenched into a thick sheet by casting a cast sheet, and the thick sheet is biaxially stretched into a film, and the film is corona treated or Flame treatment to form the mother film, the mother roll is subjected to aging treatment, and finally cut into film products. The biaxially stretched polypropylene film of the invention can realize the glue-free composite of paper and plastic, and also has the advantages of simple structure, high heat-sealing strength and high peeling strength, which is beneficial to the manufacture and promotion of products.

The invention discloses a method for manufacturing an inner covered stainless steel compound steel pipe which has good combination quality, simple working process, lower cost as well as favorable tissue and property of a stainless steel layer and a carbon steel layer. The method for manufacturing the inner covered stainless steel compound steel pipe comprises the following steps: cleaning a stainless steel thin-wall welded pipe, a carbon steel pipe and the surface of a pure copper foil after solution treatment; wrapping the pure copper foil outside the stainless steel thin-wall welded pipe, and then placing the pure copper foil and the stainless steel thin-wall welded pipe into the carbon steel pipe together; mutually sleeving an inner pipe, the pure copper foil and an outer pipe; carrying out cold drawing so that the inner pipe, the pure copper foil and the outer pipe are closely attached so as to form an interference-fit compound pipe blank; placing the interference-fit compound pipe blank into a diffusion annealing furnace filled with protective gases, heating at the temperature of 900-950 DEG C, preserving the temperature for 10-60 minutes, and cooling the compound pipe blank to normal temperature at the speed of 100-200 DEG C / minute for diffusion bonding after the compound pipe blank is taken out of the diffusion annealing furnace.