Flow marks on foamed product surface (snakeskin pattern)

Snakeskin-like texture appears on molded foam surfaces. 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: material flow front starts foaming prematurely during mold filling, producing flow marks; this factor affects the '2079851475616104453 and final quality of the product. (2) Mold aspect: insufficient mold surface finish or poor maintenance. (3) Process aspect: improper temperature or pressure parameters affecting surface molding quality. (4) Material aspect: resin formulation shrinkage or rheological characteristics affecting surface replication accuracy.

(1) Implementation measures: increase mold filling speed so that the material fills the cavity before foaming starts; formulate specific operation plans based on actual production conditions and verify implementation effects. (2) Parameter adjustment: lower raw material temperature to delay foaming onset time, noting that after cooling it is still necessary to ensure the material fully reacts or melts; adjust step by step and observe the effect. (3) Design optimization: optimize gate position and number., combine process simulation analysis or mold trial verification to continuously iterate and improve the design plan. (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.