Mold Sticking/Difficult Demolding

The product sticks to the mold surface and cannot be demolded normally. This problem is particularly prominent when the production cycle is fast or the mold temperature is abnormal, and in severe cases causes product damage.

(1) In terms of formula control: insufficient or ineffective release agent, component ratios deviating from design values lead to abnormal chemical reactions or physical states. (2) In terms of the mold: large mold surface roughness produces mechanical locking, the mold structure or condition directly affects the flow and molding of the material in the cavity. (3) In terms of shrinkage control: the curing shrinkage rate is too small or is zero shrinkage, uneven volume shrinkage leads to internal stress and dimensional deviation. (4) In terms of temperature parameters: the mold temperature is too high, causing resin adhesion, it may cause thermal degradation of the material or loss of control of the reaction rate, destroying the internal structure of the product.

(1) Material selection: select a high-quality release agent and ensure uniform and complete coverage, establish material selection evaluation standards and determine the optimal plan through comparative tests. (2) Mold maintenance: chrome-plate or polish the mold surface, regularly perform mold surface maintenance to keep the cavity finish meeting process requirements. (3) Formula optimization: appropriately increase the demolding draft angle, determine the optimal addition amount through small-batch tests and verify its impact on the comprehensive performance of the product. (4) Process control: control the mold temperature., establish an online monitoring mechanism, set upper and lower parameter limits, and implement alarm management. (5) Preventive measures: formulate a mold maintenance plan, and regularly check the release agent coating and mold surface condition.

Demolding problems need to be comprehensively solved from three aspects: mold surface treatment, release agent selection, and curing degree control.