Needle shut-off nozzle for an injection molding machine
AssigneeSulzer Chemtech AG
InventorSasan Habibi-Naini
Life of this patent
Estimating the term…
Abstract
The needle shut-off nozzle is provided in a housing for delivering polymer melt to an injection molding machine or an injection molding tool. The nozzle is mounted in a channel of the housing for a flow of the polymer melt, a nozzle at an outlet of the channel, a shut-off needle guided in the channel for shutting off the nozzle, and a needle drive for moving the shut-off needle. The needle drive includes a drive cylinder inside said channel, a piston connected to the shut-off needle and a pneumatic circuit for delivering a compressed gas at a pressure greater than 50 bar to the drive cylinder to drive the piston.
Claims14
A needle shut-off nozzle assembly for an injection moulding machine comprising
- a channel for a flow of polymer melt,
- a nozzle at an outlet of said channel,
- a shut-off needle guided in said channel for shutting off said nozzle, and
- a needle drive for moving said shut-off needle, said needle drive including a drive cylinder inside said channel, a piston connected to said shut-off needle and reciprocally mounted in said cylinder, and a pneumatic circuit for delivering a compressed gas at a pressure greater than 50 bar to said drive cylinder to drive said piston therein.
An apparatus comprising
- a plastification cylinder for conducting a flowable polymer melt,
- at least one melt channel in communication with said cylinder to receive a flow of polymer melt therefrom, and
- a needle shut-off nozzle assembly disposed in an outlet end of said melt channel to regulate a flow of polymer melt therethrough, said nozzle including a channel for a flow of polymer melt, a nozzle at an outlet of said channel, a shut-off needle guided in said channel for shutting off said nozzle, and a needle drive for moving said shut-off needle, said needle drive including a drive cylinder inside said channel, a piston connected to said shut-off needle and reciprocally mounted in said cylinder, and a pneumatic circuit for delivering a compressed gas at a pressure greater than 50 bar to said drive cylinder to drive said piston therein.
A needle shut-off nozzle assembly for an injection moulding machine comprising
- a housing having a wall defining a channel for a flow of polymer melt;
- a nozzle at an outlet of said channel;
- a drive cylinder disposed centrally of said channel;
- at least one web connecting said drive cylinder to said housing wall;
- a piston reciprocally mounted in said drive cylinder;
- a pneumatic circuit for delivering a compressed gas at a pressure greater than 50 bar to said drive cylinder to drive said piston therein;
- and
- a shut-off needle within said channel and connected to said piston for selectively shutting off and opening said nozzle to the flow of polymer melt in said channel in response to reciprocation of said piston.
Dependencies are inferred from the claim text.