Molding apparatus including screw for molded articles of thermoplastic gas impregnated resin
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-045/48
B29C-044/02
출원번호
US-0220242
(2002-08-30)
우선권정보
JP-0003780 (2001-01-11)
국제출원번호
PCT/JP02/00051
(2002-01-09)
국제공개번호
WO02/05528
(2002-07-18)
발명자
/ 주소
Shimura, Satoshi
Kawauchi, Hitoshi
Hirano, Hiroyuki
출원인 / 주소
Sekisui Chemical Co., Ltd.
대리인 / 주소
Rader Fishman & Grauer
인용정보
피인용 횟수 :
12인용 특허 :
7
초록▼
The invention provides a molding apparatus adapted to use a screw having an overall length permitting the use of an existing molding machine cylinder as it is, and is capable of realizing a gas impregnation step. The screw 3 for use in the gas impregnation step comprises a resin melting portion C di
The invention provides a molding apparatus adapted to use a screw having an overall length permitting the use of an existing molding machine cylinder as it is, and is capable of realizing a gas impregnation step. The screw 3 for use in the gas impregnation step comprises a resin melting portion C disposed at an upstream position for rendering the resin molten, a molten resin nonfilled-up portion E integral with the downstream side of the resin melting portion C for making the resin lower than an inert gas at a gas supply opening 5 in pressure, and a gas impregnation portion D integral with the downstream side of the molten resin nonfilled-up portion E for supplying the inert gas and impregnating the molten resin with the inert gas.
대표청구항▼
The invention provides a molding apparatus adapted to use a screw having an overall length permitting the use of an existing molding machine cylinder as it is, and is capable of realizing a gas impregnation step. The screw 3 for use in the gas impregnation step comprises a resin melting portion C di
The invention provides a molding apparatus adapted to use a screw having an overall length permitting the use of an existing molding machine cylinder as it is, and is capable of realizing a gas impregnation step. The screw 3 for use in the gas impregnation step comprises a resin melting portion C disposed at an upstream position for rendering the resin molten, a molten resin nonfilled-up portion E integral with the downstream side of the resin melting portion C for making the resin lower than an inert gas at a gas supply opening 5 in pressure, and a gas impregnation portion D integral with the downstream side of the molten resin nonfilled-up portion E for supplying the inert gas and impregnating the molten resin with the inert gas. to the reservoir and prior to the hydraulic oil being pumped back into the tank assemblies. 3. The method according to claim 1, further comprising providing each of the tanks with a hydraulic oil port on one end for ingress and egress of the hydraulic oil and providing each of the tanks with a gas port on an opposite end for ingress and egress of the gas. 4. The method according to claim 1, wherein the first tank assembly becomes filled with hydraulic oil at a different time than the second tank assembly becomes emptied of hydraulic oil. 5. The method according to claim 1, further comprising detecting the event when the first tank assembly is full of hydraulic oil and the event when the second tank assembly is emptied of hydraulic oil, then beginning to pump hydraulic oil into the second tank assembly only after both events have occurred, the events occurring at different times. 6. The method according to claim 1, further comprising: exposing the hydraulic oil in the reservoir to atmospheric pressure. 7. The method according to claim 1, wherein the pumping of step (b) is performed by a variable displacement pump that reduces displacement as the pressure in the storage vessel increases. 8. The method according to claim 1, wherein: step (a) comprises simultaneously pumping hydraulic oil at the same flow rates and pressures into a plurality of first tanks connected together in parallel, defining the first tank assembly; and step (c) comprises simultaneously filling with gas a plurality of second tanks connected together in parallel, defining the second tank assembly. 9. The method according to claim 1, wherein the pumping of step (b) is performed by two pumps of differing displacements, the pump with a larger displacement than the other pumping until the pressure of the gas in the storage vessel reaches a set level, then shutting off the pump with the larger displacement, and by the pump with the smaller displacement alone afterward until reaching the selected pressure in the storage vessel. 10. An apparatus for filling a storage vessel with a compressed natural gas, comprising: first and second tank assemblies, each of the tank assemblies adapted to be connected to a gas source for receiving compressed natural gas and to a storage vessel for delivering gas at a higher pressure than the pressure of the gas of the gas source, the tank assemblies being free of any pistons; a reservoir containing a quantity of hydraulic oil, the reservoir being connected to the tank assemblies and being open to atmospheric pressure; a pump having an intake connected to the reservoir for receiving the hydraulic oil and an outlet leading to the tank assemblies; and a position valve connected between the reservoir and the tank assemblies and between the pump and the tank assemblies for alternately supplying hydraulic oil to one of the tank assemblies and draining hydraulic oil from the other of the tank assemblies to the reservoir, the hydraulic oil being pumped coming into contact with the gas contained within each of the tank assemblies for forcing the gas therefrom into the storage vessel. 11. The apparatus according to claim 10, wherein the tank assemblies are vertically mounted with their upper ends connected to the storage vessel and also to the gas source and their lower ends connected to the position valve. 12. The apparatus according to claim 10, further comprising at least one check valve that prevents flow from the tank assemblies to the gas source. 13. The apparatus according to claim 10, wherein each of the tank assemblies comprises a plurality of tanks connected together in parallel. 14. The apparatus according to claim 10, further comprising: a pair of sensors for each of the tank assemblies, one of the sensors in each pair sensing when the hydraulic oil reaches a selected maximum level in the tank assemblies and providing a signal, and the other of the sensors in each pair sensing when the hydraulic oil reaches a s
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (7)
Hendry James W. (Englewood TN), Apparatus for injection molding of parts from foam plastics material and/or from solid plastics material.
Cha Sung W. (Cambridge MA) Suh Nam P. (Sudbury MA) Baldwin Daniel F. (Medford MA) Park Chul B. (Cambridge MA), Microcellular thermoplastic foamed with supercritical fluid.
Schlummer,Christian, Device for producing physically expanded structural foams during an injection molding process involving the use of dynamic mixing elements.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.