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What are the factors affecting the blow molding process of hollow blow molding machines

What are the factors affecting the hollow blow molding machine/blow molding process?

1. Blowing pressure

Compressed air in blow molding has two functions, inflation and cooling. Low viscosity, low volume or thick wall parts should use low air pressure; high viscosity, large volume or thin wall parts should use higher pressure.

2. Blowing speed

In order to shorten the blowing time, in order to facilitate the product to obtain a more uniform thickness and a better surface, the inflation speed should be as large as possible, but the speed is too fast to easily produce the following phenomena: ① Create a vacuum at the air inlet, so that this part of the parison When the parison is completely inflated, the diaphragm part will form a diaphragm; ② The parison of the die part may be pulled off by the extremely fast air flow.

3. Blow-up ratio

Usually controlled at 2-4 times, if the inflation ratio is too large, the shape stability of the product is poor, and if it is too small, it will easily cause uneven wall thickness.

4. Mold temperature and cooling time

If the mold temperature is too low, the plasticity of the plastic at the jaw will be reduced, it is not easy to swell, and the part will be thickened, and it is difficult to form; the mold temperature is too high, the cooling time is extended, and the production cycle is long. The cooling time is too short, the cooling is not It is easy to cause deformation of the product, shrinkage increases, and the surface is dull.

5. Molding cycle

Including extruded parison, intercepted parison, mold clamping, blowing, cooling, deflation, mold opening, product removal and other processes. The selection principle of the molding cycle is to shorten as much as possible on the premise of ensuring that the product can be shaped.

Posted: 03:04, 30/6/2020
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Common problems in the blowing process of pet blow molding machine

Frequently asked questions during the blowing process of pet blow molding machine

1. Feeding the old card feeder tray: This situation is a headache problem. From an empirical point of view, if the length of the preform (embryo) is relatively long and the weight is large, then this phenomenon is relatively small.

2. Feeding position without feeding: need to check several conditions:

1). Whether the hopper is out of material, if it is: the demand is fed quickly;

2) If not: please check whether the control contactor of the hoist is in the state of power. If it is a power condition, check if the motor is powered and under load at a glance. Since this condition is probably caused by the preform (preform) jamming the lifting belt, the simple way is to manually assist the lifting;

3) If you check that the control contactor of the hoist is not energized, please check whether the preform detection eye is not on the same straight line as the reflector.

3. Whether the position of the bottle always hurts the manipulator is misplaced.

4. The bottle cannot be taken out of the mold after blowing.

First of all, the mold should be opened, and the mold should be opened and closed manually.

Please check your exhaust time setting, if the exhaust setting is normal, and every time you blow a bottle, it can be judged to be the problem of the exhaust valve. Please open the exhaust valve to check the condition of its spring and seal (this This kind of fault and another phenomenon is that the exhaust sound is relatively loud or there is a dirty sound). If you encounter a situation where many molds are produced normally and accidentally come to such a situation that the mold cannot be opened, please check whether the clamping pin has a segment of the screw in it, and also check whether the clamping force is too strong, if it is too large, you should follow Standard readjustment.

5. Two manipulators collide: This situation requires manual resetting of the manipulator from scratch, which is caused by misalignment.

Posted: 04:45, 22/6/2020
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