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First, the blister principle of PVC sheet plastic processing
We often say that PVC sheet plastic processing is the use of semi-automatic plastic machine for plastic processing production. Its production process is as follows:
1 Heat the positioned plate through the oven to a softened state;
2 Then, a sealed space is formed between the plastic mold and its periphery, and the air in the mold cavity is instantly drawn away;
3 The plate is tightly attached to the surface of the mold;
4 Cool the mold and obtain the product.
Second, the working principle of plastic machine
Nowadays, the commonly used plastic blister machines for PVC blister are divided into two types: pneumatic and electric type. The commonly used ones are pneumatic ones. Now, they mainly explain the principle of pneumatic type:
Pneumatic suction machine, using compressed air, using the cylinder drive, working speed, by adjusting the input air pressure and air flow, can adjust the pressure plate's falling speed and pressure, easy maintenance.
Use: Features of the main controller on the blister panel:
1. Stamping time (die time):
The pressure plate is lowered from the initial state to the suction mold until the original state is restored. The
2. Hot mold time:
After the pressure plate is pressed into the suction mold, the heating time is shorter than the pressing time. The
3. Voltage (current) selector:
The output is selected to absorb the voltage of the heating plate on the mold, and the voltage flowing through the heating plate can be controlled by adjusting the voltage level (according to the low voltage AC safe voltage) to achieve the temperature control heating effect. The
4. Current meter:
Indicate the working current of the plastic mold and the heat plate, and at the same time, it can be used to observe whether the heat plate is in working condition.
Third, PVC plastic processing production parameters
1, Blister time is divided into: die time and hot die time.
a. Molding time is divided into: short time, lack of condensation between the plastic cover and the plastic cover, and it is not easy to stick, the molding time is long, and the production efficiency is low. The normal stamping time is longer than the hot stamping time.
b. Hot die time: the time is too short, the adhesive is insufficient, the plastic blister and the plastic blister do not adhere tightly, and the phenomenon of false plastic blister occurs. When the hopper is thrown, separation occurs. The time is too long and the amount of melted glue is too much. Bubbles are likely to form into a "candle glue" phenomenon, and a charred plastic cover appears. Therefore, the hot mold time should be moderate. The
2, voltage (current) choice.
The voltage (current) is large, and the larger the current flowing through the plastic mold heating sheet, the easier it is to produce the “candle glue” phenomenon. The
3, proofing machine proofreading.
Adjust the plastic machine, the first test plastic, can be adjusted to the following parameters: a. Die time --- 3 seconds; b. Die time --- 1.5 seconds; c. Voltage (current) selector - - Turn to 3rd gear.
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