wisepowder: Common quality problems in ferrule type cable mesh extrusion process

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Common quality problems in ferrule type cable mesh extrusion process

1. Ferrule type cable mesh

Plastic Scorch is a common quality defect in the process of plastic extrusion, which mainly shows as follows: ultra-high temperature display; coke particles in the extruded plastic layer; continuous bubbles in the gluing seam. The main reasons are as follows: the temperature control is too high to reach the thermal degradation temperature of the plastic; the screw is not cleaned for a long time, and the accumulated Scorch is extruded with the molten plastic; the heating or shutdown time is too long, so that the plastic in the barrel is heated for a long time and decomposed; the temperature control instrument is out of control or inaccurate, resulting in high temperature decomposition.To get more news about ferrule type cable mesh, you can visit mesh-fabrics.com official website.

2. Poor plasticization of extrudate

The plasticization problem has been mentioned in the temperature control requirements mentioned above. Generally, the poor plasticization is mainly manifested as follows: the surface of the extruded cladding plastic is blackened, lusterless, and has small cracks; the extruded cladding has obvious seams at the gluing point; and the ferrule type cable Non standard mesh temperature control is the main reason for poor plasticization of extrusion, including: too low temperature control; mixed with other plastic particles of different properties in insulation or sheath material; too fast screw rotation, plastic can not be fully plasticized; quality problems of plastic itself.

3. There are air holes or air bubbles in the cross section of extrusion cladding

The main reasons for the formation of air holes or bubbles in the cross-section of the extruded cladding include: too high temperature control (especially in the feeding section); moisture in the plastic affected by moisture; long-time parking, the decomposed plastic is not completely removed; high humidity in the natural environment; water in the ferrule type cable mesh core or too high content of gasifier.

4. Unqualified extrusion size

The unqualified extrusion dimensions are mainly core deviation, sheath thickness and outer diameter out of tolerance. The main reasons are as follows: the extrusion and traction speed is unstable; the outer diameter of the cable core changes too much; the extrusion amount is reduced due to too high extrusion temperature; the plastic flow is reduced due to too many impurities in the plastic blocking the filter screen; the tension of the take-up and take-off line is unstable; the selection of the die core is too large (extrusion type) or the length of the die core bearing area is too short and the core is deviated; the selection of the die spacing is not appropriate; the temperature of the extruder head is too high Non uniformity, the concentricity of the extrusion die is not adjusted properly, the high temperature of the feed port makes it difficult to feed and affects the feed flow, etc.

5. The bond strength of longitudinal tape is unqualified

The main reasons for the unqualified bond strength of ferrule type cable mesh are as follows: the extrusion temperature is too low; the production line speed is too fast, so that the sheath is rapidly cooled; the temperature of hot water tank is too low, and it is close to the die mouth; the drawing ratio of die matching is too small, or the die matching is unreasonable, which makes it loose; the melting point of the composite film of the longitudinal tape is too high;