Injection Moulding Machine Operation

Why are these flow line coming...❓

What reason is the coming Impression..❓

Gate Point पर फ्लो मार्क आ रहा है। इसको सही करने के लिए क्या कर सकते हैं।

𝙄𝙣𝙟𝙚𝙘𝙩𝙞𝙤𝙣 𝙈𝙤𝙪𝙡𝙙𝙞𝙣𝙜 𝙋𝙧𝙤𝙘𝙚𝙨𝙨

In injection moulding the mould and the plasticising area are separated from each other. The plasticising area, i.c., the plasticising cylinder temperature, is kept at the level of the processing temperature. The mould on the other hand, is kept cold enough for demoulding of the injection moulded part (thermoplastics) or warm enough for crosslinking (thermosets). The plasticised material is injected into the clamped mould. In an injection moulding machine, the clamping unit which contains the mould and the injection unit are integrated. Completely automated production is possible if the mould is installed with a vertical parting line. This enables the parts to fall down and out of the mould after demoulding. Injection moulding machines are typically used for the processing of thermoplastics. There are two types of injection unit available: a piston injection unit and a screw piston injection unit (reciprocating). The reciprocating screw method is the most common. For the processing of thermosets only screw piston machines can be used. This is because without the screw, the dwell time would be too long and the risk of early crosslinking would be too high. The injection sequence for both types of machine now follows

1.3.1 Piston Injection Unit

Injection sequence:

1. Injection starts (clamped mould, start of piston movement) (Figure 1.3)

2. Injection and dosage

3. Holding pressure (to balance the solidification shrinkage) (Figure 1.4)

4. Ejection (Figure 1.5)

clamping unit with mould

injection unit (cylinder and piston) with dosing device

Figure 1.3 Piston injection unit (1)

Figure 1.4 Piston injection unit (2)

"Introduction of Injection Moulding"

Injection moulding is one of the most common processes used to produce plastic parts. It is a cyclic process of rapid mould filling followed by cooling and ejection.

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