Continuous foamed board shows "sharkskin" surface

Sharkskin-like rough texture appears on the surface of extruded/continuous foamed boards. Surface defects directly affect the appearance quality and usability of the product, and are particularly evident in transparent products. This defect affects the appearance quality of the product and reduces the market competitiveness of the product.

(1) Process factor: melt fracture at the die or periodic tearing of the skin; this factor affects the '2079851475616104453 and final quality of the product. (2) Temperature parameter aspect: die temperature too low, leading to insufficient reaction kinetics or deterioration of material fluidity, affecting the normal progress of the '2079851475616104453. (3) Mold aspect: insufficient mold surface finish or poor maintenance. (4) Process aspect: improper temperature or pressure parameters affecting surface molding quality. (5) Material aspect: resin formulation shrinkage or rheological characteristics affecting surface replication accuracy.

(1) Parameter adjustment: increase die temperature; it is recommended that each adjustment range be 5-10°C, while monitoring product quality changes to avoid new defects caused by excessive temperature. (2) Formulation adjustment: reduce extrusion speed, adjust gradually and verify the effect, ensuring that other performance indicators of the product are not affected. (3) Formulation optimization: reduce die gap or increase die land length., determine the optimal addition amount through small-batch tests, and verify the impact on the comprehensive performance of the product. (4) Preventive measures: establish a sound process control standard and quality inspection system, and regularly review process data for continuous optimization.

Surface defects are the result of the combined action of mold condition, process parameters, and material formulation; each factor must be systematically investigated and targeted optimization performed.