SJ Series Plastic Single Screw Co-Extruder Machine for Pipe Color Line
ISO Standard SJ Series Plastic Single Screw Co-Extruder Machine is necessary part of the core operations in polymer processing which is used for inner layer or outter layer extrusion process or color line on the surface of plastic pipes.
Like other Single screw extruders, Co-extruder is composed of driven motor, gear reducer box, screw and barrel, casting aluminum heater, cooling blower, hopper and control cabinet. All parts of single screw extruder are essential.
Co-extrusion is a process that allows two, or more, melt streams to combine in a die to make an extrudate from two or more materials. This process is now linked to thermoplastics materials, although it was first used with rubbery polymers to make an extrudate with layers of different colors. With thermoplastics, the layers of material are often combined in the die.
The simplest example combines only two layers, for instance a colored layer on a natural core, which saves on colorant costs. Films based on three or more layers are common in the packaging industry. Laminating two or more different polymer layers together can result in a product that has better barrier properties than those obtained when only a single polymer is used.
One of the polymers frequently used is a moisture or gas barrier layer based on polyvinyl alcohol (PVAL). Usually, two or three extruders are used to produce three-layered structures. In the blow-molding process, co-extrusion and bi-axial orientation can possibly be combined to produce lightweight yet strong bottles that extend the storage life of products.
Layered co-extrusion is not the only form of co-extrusion. A sequential co-extrudate can be produced by combining the materials one after the other. This may include a hard thermoplastic material combined with a soft thermoplastic material. Alternatively, two materials can be extruded side-by-side, for example, a clear material together with an opaque material, to produce a sheet for making thermoformed trays
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