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| Learn about Injection Molding Machine (PART IV) |
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This article will show you more basic knowledge of injection molding machine from two aspects of the factors to influence product and ways to refine product defectiveness.
I. Factors to influence product
Factors to influence product are mainly as follows: (1) machine problems; (2 )mould problems; (3) material problems; (4) human factor; (5) environment factor
(1) Machine problems
| Time |
Temperature |
Pressure |
| Screw advance |
Heater |
Ejector |
| Material Cooling |
Nozzle |
Insufficient injection cavity |
| Mould opening time |
Raw material drying |
Pressure holding |
| Injection speed |
Heat from screw rotation |
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(2) Mould problems
| Time control |
Pressure control |
Temperature control |
| Injection time |
Design of main sprue and other sprue |
Design of flow Line length of melting material in die cavity |
| Cooling time |
Design of flow Line length of melting material in die cavity |
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Die exhaust |
Whether the Design of cooling Tube in Die is even and reasonable |
(3) Material problems
| Flow property |
Thermal property |
Colloidal particles |
| Melt viscosity in injection molding |
Thermal conductivity |
Size and shape |
| Viscosity change under different flow particles (i.e. shear force influenced by viscosity) |
The time required for the starting of the material from cooling to crystallization |
Lubrication property |
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| Resin formula |
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(4) Human factor
Human factor refers to the professional skills of operators. Itās the dependent factor on product quality.
(5) Environment factor
The surrounding temperature and humidity to a great extent influences the injection process. The higher quality you need about the machine, the higher requirements are needed on the surroundings.
II. Ways to refine product defectiveness
1. Analysis of refine product defectiveness
An approximate injection cycle depends at first on operatorās experience. Check whether the products are good. If not, adjust the time, temperature, pressure one by one. If thereās no difference, it might be the problem of mould and material.
2. Five principles to abide by
(1) Set next plan; (2) Change one factor a time; (3) Adjust one factor a time; (4)Write down operation condition every time; (5) Save up the operation note for future reference
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