초록 ▼

A process for producing an injection molded product includes the step of introducing an amount of a molten thermoplastic sufficient for the preparation of the injection molded product into a mold cavity. A quantity of heated gas is introduced into the mold cavity, the molten thermoplastic in the mol

A process for producing an injection molded product includes the step of introducing an amount of a molten thermoplastic sufficient for the preparation of the injection molded product into a mold cavity. A quantity of heated gas is introduced into the mold cavity, the molten thermoplastic in the mold cavity thereby forming a gas cavity in the molten thermoplastic. The heated gas is then vented from the gas cavity and a cooling gas is introduced into the gas cavity. The injection molded product is cooled and then the cooling gas is vented from the gas cavity.

대표청구항 ▼

A process for producing an injection molded product, comprising: introducing a molten stream of a thermoplastic material at a first, injection, pressure into a mold cavity having walls; introducing a heated gas at a second pressure, which is at least as high as the first pressure, into the molten st

A process for producing an injection molded product, comprising: introducing a molten stream of a thermoplastic material at a first, injection, pressure into a mold cavity having walls; introducing a heated gas at a second pressure, which is at least as high as the first pressure, into the molten stream of thermoplastic material thereby forming a gas cavity in the thermoplastic material; venting the heated gas from the gas cavity; urging the thermoplastic material against the walls of the mold cavity by introducing a cooling gas, held at a third pressure which is higher than said second pressure, into the gas cavity; cooling the thermoplastic material to form an injection molded product; and, venting the cooling gas from the gas cavity.