Dissatisfaction

Process problems: the plasticizing temperature is too low, the nozzle temperature is too low, the injection time is too short, the injection speed is too slow, and the mold temperature is too low.

Mold problems: too small flow path, gate is too small, gate location is unreasonable, poor exhaust, cavity type of debris.

Raw material problems: poor liquidity, mixed with impurities.

Flfei

Process problems: plasticizing temperature is too high, injection time is too long, feeding quantity is too much, injection pressure is too high, mould temperature is too high, and there are sundries between templates.

Mold problems: mold deformation, core and cavity matching size error, template combination is not parallel, exhaust groove is too deep.

Equipment problems: template is not parallel, template closed.

Raw material problem: exorbitant mobility.

deformation

Process conditions: too high temperature, too high mold temperature, too short holding time, too short cooling time, and forced release.

Mold aspects: gate location is not proper, gate quantity is not enough, the ejection position is improper to make the force uneven.

Flow mark

Process conditions: low temperature, incomplete plasticization, low injection speed, too little injection pressure, low pressure holding pressure, too low mold temperature, and insufficient injection volume.

Mold: gate is too small, gate quantity is too small, runner gate rough, poor surface finish.

Equipment: after the temperature control, the system fails and the pressure of the oil pump drops.

Raw materials: too much volatile matter, poor fluidity, mixed with miscellaneous materials.

Technical conditions: low injection pressure, insufficient pressure, insufficient holding time and high material temperature.

Mold: poor exhaust, gate location is unreasonable, gate size is too small.

Raw materials: moisture is not dry or dry time is not enough, shrinkage rate is too large.

Crater

Process conditions: insufficient feeding, short injection time, short holding time, too high material temperature, too high mold temperature, and too short cooling time.

Mold: the runner is too small, the gate is too small, and the exhaust is bad.

Equipment: injection pressure is not enough, nozzle blockage of foreign bodies.

Raw materials: excessive shrinkage

Process conditions: injection pressure is too low, the barrel temperature is too high, the holding time is variable, the injection cycle is unstable, the mold temperature is too high.

Mold aspects: uneven gate size, cavity size is not allowed, loose core, mold temperature too high or no watercourse.

Raw materials: brand variety, uneven particle size and volatile substances.

Difficulty of demoulding

Technical conditions: injection pressure is too high, holding time is too long, injection volume is too much, mold temperature is too high.

Equipment: the top output is not enough, the top distance is not enough.

Mold aspects: no demoulding slope, smooth finish, improper ejection mode, improper matching accuracy, poor exhaust, and template deformation.

Silver Stripe

Process conditions: too high temperature, injection speed too fast, injection pressure too large, uneven plasticization, too much release agent.

Mold: gate is too small, poor mold finish, poor exhaust.

Equipment: low back pressure and spray tape.

Raw materials: moisture is not dry and lubricant is excessive.

Process conditions: too high material temperature, too high injection pressure, too fast speed, too long downtime and uncleanness of release agent.

Mold: gate is too small, bad exhaust, complex cavity, poor cavity finish.

Raw materials: there are impurities mixed into the material and powder material in the granular material.

Discoloration

Process conditions: too high material temperature, too high injection pressure, long molding cycle, uncooled mould, and high nozzle temperature.

Mold: the gate is too small.

Equipment: there are obstructions in the barrel or nozzle, and the screw speed is high. The core is not in the center of the center of the nozzle.

Raw materials: material pollution, coloring agent decomposition, high volatile content.

Weld Lines

Process conditions: low injection pressure, short injection time, low material temperature, too much clamping force, and improper release agent.

Mold: mold temperature is too low, the flow path is small, gate location is not correct, bad exhaust.

Equipment: poor plasticization.

Raw materials: poor liquidity, too many lubricants, foreign materials.

Gloss defect

Process conditions: low temperature or mold temperature, too low injection pressure, too large or too small injection rate, and too short cooling time.

Mold aspects: mold roughness becomes larger, gate is too small, the runner is too thin, and the exhaust is bad.

Equipment: insufficient supply.

Raw materials: raw materials are not dried or contain volatile substances, raw materials are easy to degrade, auxiliaries or release agents are excessive or poor quality, and contain foreign bodies.