Fine scratches on the product surface (mold wear marks)

In the injection '2079851475616104457 production process, the product exhibits the quality defect of "Fine scratches on the product surface (mold wear marks)".The specific manifestation is Regular fine scratches appear on the product surface.This defect is more common when processing materials such as PET, PP, HDPE and PS, and its occurrence is usually related to unreasonable settings of injection pressure, parison temperature, blowing pressure and mold temperature.When the Fine scratches on the product surface (mold wear marks) situation is severe, it will cause a series of chain quality defects in the product's appearance, dimensional accuracy, mechanical properties and other aspects, which not only reduces the product's functionality and safety in use, but also directly increases the scrap rate and production cost.Therefore, this problem requires systematic diagnosis and optimization from multiple dimensions such as material selection, the status of the injection '2079851475616104457 machine, core rod, parison mold, blow mold and transfer mechanism, and injection pressure, parison temperature, blowing pressure and mold temperature.

1. Wear or scoring of the mold cavity surface.The mold is the core tool that gives the product its shape and surface quality.Unreasonable mold design, such as improper runner/gate dimensions, insufficient venting and inadequate draft angle, will directly lead to forming defects.The machining accuracy, surface treatment quality and daily maintenance status of the mold also directly affect product quality. In addition, the insufficient overall coordination of parison wall thickness uniformity and transfer temperature control is also a factor that cannot be ignored; there are complex interactions and coupling relationships among the process parameters, and the deviation of any parameter may aggravate the degree of Fine scratches on the product surface (mold wear marks) through chain effects.

1. Polish and repair the cavity surface.Polishing should proceed step by step from coarse to fine; each time a finer abrasive is used, the polishing direction should be changed to eliminate the texture marks of the previous step.The final surface roughness should be tested with a roughness meter to confirm it meets the standard.After polishing is completed, thoroughly clean to remove abrasive and grinding agent residues to prevent them from entering the melt and contaminating the product. 2. Replace with wear-resistant mold material.When replacing parts, original manufacturer spare parts of the same or higher specification should be selected to ensure installation accuracy and fit tolerances meet equipment technical requirements.After replacement, relevant parameters need to be recalibrated and trial runs conducted to verify the effect; normal production can only be resumed after confirming expectations are met.It is recommended to establish a spare parts life cycle management ledger. It is recommended to formulate a preventive checklist for the Fine scratches on the product surface (mold wear marks) problem, incorporate parison wall thickness uniformity and transfer temperature control into the daily inspection scope, and conduct online monitoring of key parameters through the SPC statistical process control method to achieve early warning and rapid response to problems. In terms of material management, incoming inspection of raw materials and in-process testing of work-in-progress should be strengthened, and key performance indicators of PET, PP, HDPE and PS should be strictly controlled to ensure the stability of forming quality from the source.

In summary, the causes of the "Fine scratches on the product surface (mold wear marks)" problem can be attributed to the combined action of multiple factors such as Wear or scoring of the mold cavity surface.To solve this problem, it is necessary to start from aspects such as Polish and repair the cavity surface, Replace with wear-resistant mold material and take systematic governance measures.In actual production, it is recommended to establish a prevention and rapid response mechanism for this problem, achieving stable production and continuous improvement through parison wall thickness uniformity and transfer temperature control.