Bottle Preform Making Machine

Bottle preform making machine is a large machine specially used to produce plastic bottle preforms. In life, the use of plastic bottles is more and more widespread. Mass production of plastic bottles has become a demand. The plastic bottle is first produced by the ZOWEITE® bottle preform making machine, and then blown into the shape of the plastic preform by the blow molding machine. This shows that the production of plastic preforms is the key. Bottle preforms making machine are very important for the production of machine raw tea plastic preforms, which are related to the tightness of plastic bottles.

ZOWEITE® injection molding machine seized this critical moment and developed several machines specially used to produce plastic preforms-bottle preform making machines. The models are as follows: GF260 GF30 and GF400 three models.

How should the adjustment of the plastic bottle preform making machine be adjusted?

The adjustment of the plastic bottle preform injection molding machine is generally divided into three steps:

1. The parameters need to be confirmed and prepared before parameter setting

(1) Confirm whether the material drying, mold temperature and heating cylinder temperature are correctly set and reach a machinable state.

(2) Check the action and distance setting of opening and closing the mold and ejection.

(3) The injection pressure P1 is set at 60% of the maximum value

(4) Keep the pressure PH set at 30% of the maximum value

(5) The injection speed V1 is set at 40% of the maximum value

(6) The screw speed VS is set at about 60RPM

(7) The back pressure PB is set at about 10kg/c㎡

(8) The loose retreat is set at 3mm

(9) The position of holding pressure switch is set at 30% of the screw diameter

(10) The measuring stroke is slightly shorter than the calculated value.

(11) The total injection time is slightly shorter, and the cooling time is slightly longer.

2. Manual operation parameter correction

(1) Lock the mold (confirm the rise of high pressure), and the injection seat moves forward

(2) Inject manually until the screw stops completely, and pay attention to the stop position

(3) Screw feeding back

(4) After cooling, open the mold and take out the molded product

(5) Repeat the steps (1) ~ (4), the screw finally stops at the position of 10%-20% of the screw diameter. And the molded product has no short shots, burrs, whitening, or cracks, etc.

3. Modification of semi-automatic operating parameters

(1) The correction of the metering stroke increases the injection pressure to 99%, and temporarily adjusts the holding pressure to 0, and adjusts the metering end point S0 forward to short shots, and backwards to burrs. The middle point is the choice. Location

(2) Correction of the output speed to restore the PH to the original level, adjust the injection speed up and down, find out the individual speeds where short shots and burrs occur, and use the middle point as the appropriate speed

(3) Correction of the holding pressure. Adjust the holding pressure up and down to find out the individual pressures that cause surface dents and burrs, and choose the middle point as the holding pressure

(4) The correction of the holding time gradually extend the holding time until the weight of the molded product is obviously stable, which is a clear choice

(5) Correction of cooling time Adjust the cooling time step by step, and make sure that the following conditions can be satisfied:

1. The molded product is ejected, clamped, trimmed, and the packaging will not be whitened, cracked or deformed

2. Constant mold temperature

(6) Modification of plasticization parameters

1. Confirm whether the back pressure needs to be adjusted

2. Adjust the screw speed so that the metering time is slightly shorter than the cooling time

3. Confirm whether the measurement time is stable, try to adjust the gradient of the heating ring temperature

4. Confirm whether there is dripping in the nozzle, whether pig tails or sticking occurs in the main runner, and whether the finished product has air marks, etc., and adjust the nozzle temperature or loosening distance appropriately.

(7) Flexible use of multi-stage pressure holding and multi-stage firing rate

1. Generally speaking, in the case of not affecting the appearance, the principle of injection should be high speed, but it should be carried out at a lower speed before passing through the gate and switching between the holding pressure.

2. The holding pressure should be gradually reduced to avoid too high residual stress in the molded product, which makes the molded product easy to deform.