1. Confirm and prepare parameter settings before setting parameters

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

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

(3) Set the injection pressure (P1) at 60% of the maximum value.

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

(5) Set the injection speed (V1) to 40% of the maximum value.

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

(7)Set the back pressure (PB) at approximately 10kg/cm2.

(8)Set the looseness to approximately 3mm.

(9)The position for pressure maintaining switching is set at 30% of the screw diameter. for example φ 100mm screw, set 30mm.

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

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

2. Manual operation parameter correction

(1) Lock the mold (confirm the rise of high pressure) and advance the injection seat.

(2) Manually shoot until the screw completely stops, and pay attention to the stop position.

(3) Screw rotation back feeding.

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

(5)Repeat steps (1) to (4) until the screw finally stops at a position between 10% and 20% of the screw diameter, and there are no short shots, burrs, whitening, or cracks in the formed product.

3. Correction of semi-automatic operation parameters

(1) The correction of the metering stroke [metering end point] increases the injection pressure to 99%, temporarily sets the pressure holding to 0, and sets the metering end point S0 forward to the point where short shots occur, and then backward to the point where burrs occur, taking its middle point as the selected position.

⑵ Correction of discharge speed restores PH to the original level, adjusts the discharge speed up and down, and identifies individual velocities where short shots and burrs occur. The appropriate speed is the midpoint. [This stage can also enter parameter settings that correspond to appearance issues with multiple speeds].

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

(4)The correction of the holding time [or injection time] gradually extends the holding time until the weight of the formed product is significantly stable, which is a wise choice.

(5) Correction of cooling time: Gradually reduce the cooling time and confirm that the following conditions can be met:

1. The molded product will not whiten, crack or deform when pushed out, clamped out, trimmed, or packaged.

2. The mold temperature can be balanced and stable. A simple algorithm for the cooling time of products with a meat thickness of 4mm or more:

① Theoretical cooling time=S (1+2S)... mold temperature below 60 degrees Celsius.

② Theoretical cooling time=1.3S (1+2S)... The mold is above 60 degrees [S represents the maximum thickness of the formed product].

(6)Correction of plasticizing parameters

① Confirm whether the back pressure needs to be adjusted;

② Adjust the screw speed to make the metering time slightly shorter than the cooling time;

③ To confirm whether the measurement time is stable, try adjusting the gradient of the heating coil temperature.

④ Confirm whether there is any material dripping from the nozzle, whether there is pig tail or mold sticking in the main channel, and whether there are air marks in the finished product. Adjust the temperature or loosening distance of the nozzle appropriately.

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

① Generally speaking, injection should follow the principle of high speed without affecting the appearance, but should be carried out at a lower speed before passing through the gate and pressure switching;

② The pressure should be gradually reduced to avoid high residual stress in the formed product, which can easily deform the formed product.