Direct Injection Process:
To produce a direct injection safety shoes. it goes through 4 processes:
1. Loading lasted upper to dummy
2. Insert pre-moulded rubber outsole
3. Heat activation
4. PU injection to fill up the cavity between the leather upper and moulded outsole
Shoe Upper Insertion – This process required skill through experience.
The shoe technician need to load the lasted upper to ensure it sit firm and on the right position
of the dummy. This is because the last was placing upside down).
Heat Activation – Heating process help to strengthen the internal bonding between PU and outsole.
Thus the sole will be stronger and more durable.
PU Injection – The melted PU acts as a strong adhesive agent between the leather upper and the pre-moulded
rubber outsole. The nature of PU are soft hence it also serve as a cushioning for the entire shoe.
PU (Polyurethane) Injection
The Melted PU(Polyurethane) Will Bond Very Well To The Material It Going To Adhere To Hence Ensure Perfect
Bonding Between The Leather Upper And Bottom Outsole.