Nozzle for injection molding and injection molding machine

A process of sandwich molding for manufacturing an injection molding product, the surface portion of which is formed from a resin for skin and the interior of which is formed from a resin for core, by use of a nozzle, said nozzle comprising:

• a nozzle body being connected via a discharge port provided at the tip end thereof to the back surface of dies, and having a first supply port and a second supply port, a first passage which connects the first supply port to the discharge port and a second passage which connects the second supply port to the discharge port being formed in the interior of said nozzle body;
• a first supply line introducing a first molten resin to said first supply port;
• a first stop valve being provided within the first supply line;
• a second supply line introducing a second molten resin to said second supply port;
• and
• a second stop valve being provided within the second supply line;
• said process comprising the steps of:
• introducing the resin for core into the dies through said first supply line and said first passage;
• and
• introducing the resin for skin into the dies through said second supply line and said second passage.

A process of sandwich molding for manufacturing an injection molding product, the surface portion of which is formed from a resin for skin and the interior of which is formed from a resin for core, by use of a nozzle,

• said nozzle comprising:
• a nozzle body being connected via a discharge port provided at the tip end thereof to the back surface of dies, and having a first supply port and a second supply port, a first passage which connects the first supply port to the discharge port and a second passage which connects the second supply port to the discharge port being formed in the interior of said nozzle body;
• a first supply line introducing a first molten resin to said first supply port;
• a first stop valve being provided within the first supply line;
• a second supply line introducing a second molten resin to said second supply port;
• and
• a second stop valve being provided within the second supply line;
• said process comprising the steps of:
• introducing the resin for skin into the dies through said first supply line and said first passage;
• and
• introducing the resin for core into the dies through said second supply line and said second passage.