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Technology


    Zhonglei Science specializes in the development and optimization of the product formula and process. With scientific process control technology and

    analytical technology, our success can not be separated from you.



    Zhonglei Science have a perfect supply chain network, advocating for customers and suppliers more excellent service. Your satisfaction is our supreme honor.




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    Analysis of common defects in injection molding

    打不滿.png

    Short shot

    Problems of technology: plasticizing temperature is too low; nozzle temperature is to low; injection molding
           time is too short; injection molding speed is too slow or mold temperature is too low.

    Problems of mold: runner is too small; gate is too small; gate position is not reasonable; poor ventilation or
           there are adulterants in the mold cavity.

    Problems of raw material: poor flowability or there are adulterants among them.

    飛邊.png

    Flashing

    Problems of technology: plasticizing temperature is too high; injection molding time is too long; feeding
           volume is too large; injection molding pressure is too high; mold temperature is too high or there are adulterants
           between two plates.

    Problems of mold: distortion of mold; there is error between the size of mold core and that of mold cavity;
           plate asse mbly is not parallel or the air vent is too deep.

    Problems of equipment: unparallel plates or the plates can not close tightly.

    Problems of raw material: too high flowability.

    變形.png

    Distortion

    Problems of technology: material temperature is too high; mold temperature is too high; pressure holding
           time is too short; force the mold to release when the cooling time is not enough.
           Problems of mold: gate position is not right; gate number is not enough; the wrong ejection position results in
           unequal stress.

    流痕.png

    Flow line

    Problems of technology conditions: material temperature is too low and hasn’ t fully plasticized;  injection
           molding speed is too slow;  injection pressure is too small;  pressure of pressure holding is not enough;  mold
           temperature is too low; injection molding quantity is insufficient.

    Problems of mold: gate is too small; gate number is inadequate;  runner gate is rough or poor glossiness of
           molding surface.

    Problems of equipment: system fails after temperature control; pressure of oil pump decreases.

    Problems of raw material: too many volatile matters; poor flowability or with adulterants.

    氣泡.png

    Bubbles

    Problems of technology conditions:  injection molding pressure is too low; pressure of pressure holding is not                   enough; pressure holding time is inadequate or material temperature is too high.

    Problems of mold: poor ventilation; unreasonable gate position or too small gate size.

    Problems of raw material:with moisture content and not dry enough; insufficient drying time or shrinking
           percentage is too high.

    坑位.png

    Sink mark

    Problems of technology conditions: fed material is insufficient, injection molding time is too short;  pressure
           holding time is too short; material temperature is too high; mold temperature is too high; cooling time is too short.

    Problems of mold: too thin runner, too small gate and poor ventilation.

    Problems of equipment: inadequate injection molding pressure or there are adulterants blocking up the nozzle.

    Problems of raw material: shrinking percentage is too high.

    尺寸.png

    Unsteady size

    Problems of technology conditions:  injection molding pressure is too low;  feed cylinder temperature is too
           high; pressure holding time changes; injection molding period is unsteady or mold temperature is too high.

    Problems of mold:Gate size is unequal, mold cavity size is inaccurate; mold core becomes loose; mold
            temperature is too high or there is no waterway.

    Problems of raw material:  the trademark and brand changes;  the size of grains differs in size or there are
           volatile matters.

    脫離困難.png

    Ejection difficulties

    Problems of technology conditions:injection molding pressure is too high;pressure holding time is too long;
           injection molding capacity is too large or mold temperature is too high.

    Problems of equipment: ejection power is not enough or ejection stroke is inadequate.

    Problems of mold: no draft angel; poor glossiness; wrong way of ejection; quality of fit is not right,  poor
           ventilation; plate distortion.

    銀紋.png

    Splay

    Problems of technology conditions:  material temperature is too high; injection molding speed is too fast;
           injection molding pressure is too high; uneven plasticization; too much ejection agent.

    Problems of mold: gate is too thin; poor glossiness of mold; poor ventilation.

    Problems of equipment: back pressure is too low or there is tape casting matters in the nozzle.

    Problems of raw material: with moisture content and is not dry enough; too much lubricant.

    燒焦.png

    Gas mark

    Problems of technology conditions: material temperature is too high; injection molding pressure is too high;
           injection molding speed is too fast; dead time is too long; ejection agent is not pure.

    Problems of mold: gate is too thin; poor ventilation; complex mold cavity; poor glossiness of mold cavity.

    Problems of raw material: There are adulterants in the material or there is powder in the granules.

    變色.png

    Discoloration

    Problems of technology conditions:material temperature is too high; injection molding pressure is too high;
           molding cycle is too long; the mold has not cooled down; the temperature of nozzle is high.

    Problems of mold: gate is too thin.

    Problems of equipment:  there is obstruction in the material cylinder or nozzle;  screw rev is too fast;  mold core
           and the center of nozzle is non-concentric.

    Problems of raw material: material contamination; dissolution of colouring agent, or high percentage of volatile                 matters.

    模型.png

    Welding mark

    Problems of technology conditions:injection molding pressure is too high;injection molding time is too short;
           material temperature is too low; mold clamping force is too strong; ejection agent is not suitable.

    Problems of mold: mold temperature is too low; runner is too thin; gate position is not right; poor ventilation.

    Problems of equipment: poor plasticization.

    Problems of raw material: poor flowability; too much lubricant or there are adulterants in the materials.

    銜接平臺.png

    Gloss defect

    Problems of technology conditions: material temperature or mold temperature is relatively low; injection pressure
           is too low; injection molding speed is fast or too slow; cooling time is too short.

    Problems of equipment: insufficient material supply;

    Problems of raw material: raw material hasn’t been dried or there are volatile matters among them;  raw material
           is easy to degrade ; too much auxiliary agent or ejection agent or because of their poor quality ; there are foreign             materials among them.



     

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