IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0601307
(2012-08-31)
|
등록번호 |
US-10076861
(2018-09-18)
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발명자
/ 주소 |
- Altonen, Gene Michael
- Neufarth, Ralph Edwin
- Schiller, Gary Francis
|
출원인 / 주소 |
|
대리인 / 주소 |
Marshall, Gerstein & Borun LLP
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
37 |
초록
▼
A low constant pressure injection molding machine forms molded parts by injecting molten thermoplastic material into a mold cavity at low substantially constant pressures of 6,000 psi and less. As a result, the low constant pressure injection molding machine includes a mold formed of easily machinea
A low constant pressure injection molding machine forms molded parts by injecting molten thermoplastic material into a mold cavity at low substantially constant pressures of 6,000 psi and less. As a result, the low constant pressure injection molding machine includes a mold formed of easily machineable material that is less costly and faster to manufacture than typical injection molds.
대표청구항
▼
1. An injection molding apparatus for molding thermoplastic material, the apparatus comprising: a melt holder for pressurizing molten thermoplastic prior to injection into a mold having a plurality of mold cavities, each mold cavity having a single gate;a sensor for sensing the molten thermoplastic,
1. An injection molding apparatus for molding thermoplastic material, the apparatus comprising: a melt holder for pressurizing molten thermoplastic prior to injection into a mold having a plurality of mold cavities, each mold cavity having a single gate;a sensor for sensing the molten thermoplastic, wherein the sensor is disposed at a nozzle of the melt holder; anda controller in communication with the sensor, the controller receiving a signal from the sensor, the signal being indicative of a melt pressure of the molten thermoplastic at the nozzle, the controller further being in communication with an injection element, the injection element applying a force to the molten thermoplastic to advance the molten thermoplastic from the melt holder into the mold, wherein the controller controls the injection element to maintain the molten thermoplastic at a substantially constant melt pressure at the nozzle while filling the mold cavities, wherein the substantially constant melt pressure is less than 6000 psi and fluctuates no more than 30%, andwherein the at least one mold cavity in the plurality of mold cavities is a thin-walled mold cavity having an L/T>100, where L/T is defined as a length of a flow channel in the mold divided by a thickness of the flow channel in the mold, and the length of the flow channel is measured from the single gate to an end of a flow channel. 2. The injection molding apparatus of claim 1, wherein the sensor generates an electrical signal. 3. The injection molding apparatus of claim 1, wherein the sensor generates a mechanical signal. 4. The injection molding apparatus of claim 1, wherein the sensor generates a hydraulic signal. 5. The injection molding apparatus of claim 1, wherein the sensor generates a pneumatic signal. 6. The injection molding apparatus of claim 1, further comprising a mold frame and a mold base, wherein at least one of the mold frame and the mold base is made from a material having a surface hardness of greater than 165 BHN and less than 260 BHN. 7. The injection molding apparatus of claim 1, wherein the mold has an average thermal conductivity of more than 30 BTU/HR FT ° F. and further comprising a hot runner feed system constructed of a material having a thermal conductivity that is substantially equal to the average thermal conductivity of the mold. 8. The injection molding apparatus of claim 7, wherein the hot runner feed system is directly connected to the gate that is fluidly connected with the at least one mold cavity. 9. The injection molding apparatus of claim 1, wherein the mold comprises at least four mold cavities. 10. The injection molding of apparatus of claim 1, wherein the mold is formed from a material having a surface hardness less than 30 Rc. 11. The injection molding apparatus of claim 1, wherein the controller controls the injection element to maintain a substantially constant melt pressure that fluctuates no more than 20%. 12. The injection molding apparatus of claim 1, wherein the mold is a class 101 high production mold. 13. The injection molding apparatus of claim 1, wherein the mold is configured to withstand at least 500,000 cycles per year. 14. The injection molding apparatus of claim 1, wherein the mold is configured to withstand at least 1,000,000 cycles per year. 15. The injection molding apparatus of claim 1, wherein the mold is configured to withstand at least 5,000,000 cycles per year. 16. An injection molding machine, which includes the injection molding apparatus of claim 1. 17. The injection molding apparatus of claim 1, wherein the at least one mold cavity has a thickness of less than 15 mm. 18. The injection molding apparatus of claim 17, wherein the at least one mold cavity has a thickness of less than 5 mm. 19. The injection molding apparatus of claim 18, wherein the at least one mold cavity has a thickness of less than 1 mm.
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