High haze of transparent products

In the extrusion '2079851475616104457 production process, the product exhibits the quality defect of "High haze of transparent products".The specific manifestation is The transparent product has low light transmittance and high haze.This defect is more common when processing materials such as HDPE, PP, PVC and PC, and its occurrence is usually related to unreasonable settings of melt temperature, extrusion speed, blowing pressure and mold temperature.When the High haze of transparent products 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 extruder, head, die, mold clamping mechanism and blowing system, and melt temperature, extrusion speed, blowing pressure and mold temperature.

1. High moisture content of the resin.Material selection and handling are the foundation of forming quality.The intrinsic properties of the resin such as molecular weight, molecular weight distribution and melt index determine its processing window and final performance.Factors such as excessive moisture content of raw materials, mixed impurities and improper regrind ratios will all cause various defects during processing. 2. Mold surface not smooth.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. 3. Regrind mixing in.This factor causing the problem reflects that certain process conditions or material properties in extrusion '2079851475616104457 do not meet the optimal forming requirements.Such problems are often cumulative and concealed, and should be investigated and verified as key focus items during process debugging and finalization to ensure hidden dangers are eliminated at the source. In terms of equipment maintenance, the regular overhaul and accuracy confirmation of the extruder, head, die, mold clamping mechanism and blowing system are not in place, causing the actual operating parameters of the equipment to deviate from process requirements, which will also become a potential inducement of the High haze of transparent products problem.

1. Strictly dry the raw material.Raw '2079851475616104451 should select matching drying equipment types according to resin type and water absorption characteristics, and reasonably set drying temperature, drying time and dew point indicators.Dried raw materials should be put into production as soon as possible; if temporary storage is needed, they should be kept in sealed containers in a dry environment (dew point below -30°C).Regularly test the drying effect to ensure the moisture content meets the standard. 2. Polish the mold to a mirror finish.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. 3. Use virgin material to produce transparent products.Before introducing new tools, new materials or new methods, sufficient applicability evaluation and small-batch verification should be carried out.It is recommended to first conduct offline tests or simulation analyses outside production conditions, and introduce them into the formal production line only after confirming effectiveness and safety.Keep proper change management records to facilitate subsequent traceability and experience accumulation. 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 HDPE, PP, PVC and PC should be strictly controlled to ensure the stability of forming quality from the source.

In summary, the causes of the "High haze of transparent products" problem can be attributed to the combined action of multiple factors such as High moisture content of the resin, Mold surface not smooth.To solve this problem, it is necessary to start from aspects such as Strictly dry the raw material, Polish the mold to a mirror finish 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 control and parison temperature uniformity.