Backrest size: 510*680*180mm
Mold cavity: 1 cavity
Mold size: 730*890*460mm
Suitable machine: 800T Machine
Mold material: P20
Runner system: 1 point hot runner direct cone gate
Ejection system: ejector pin
Mold running: full automaticity
Injection cycle time: 45 seconds
Mold normally delivery time: 60 days
Mold features: interchangeable insert block for different versions of chair backrest, simple structure mould, optimal cooling system, good polishing, precision air venting
The calculation of clamping force in the injection molding machine
1. Empirical Formula 1
Clamping force (T) = clamping force constant Kp * product projected area S (CM * CM)
Kp experience value:
PS/PE/PP – 0.32;
ABS – 0.30~0.48;
PA – 0.64~0.72;
POM – 0.64~0.72;
Add glass fiber – 0.64~0.72;
Other engineering plastics – 0.64~0.8;
For example, a product has a projected area of 410 cm² and the material is PE, calculate clamping force.
Calculated by above formula: P = Kp * S = 0.32 * 410 = 131.2 (T), 150T machine tool should be selected.
2. Empirical Formula 2
As above, 350*410/1000=143.5T, choose 150T machine.
3. Two important factors in calculating clamping force
Projected area (S) is the largest area viewed along with mold opening and closing.
Determination of cavity pressure (P)
Cavity pressure is affected by the following factors:
* Number and location of gates
* Gate size
* Wall thickness of product
* Viscosity characteristics of plastics used
* Injection speed
Taizhou Saiweiyue Mould & Plastic Co., Ltd.