[특허]Apparatus for injection molded articles

Husky Injection Molding Systems, Ltd.

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특허 상세정보

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Apparatus for injection molded articles

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B29C-045/23
미국특허분류(USC)	425/564; 264/328.9
출원번호	US-0670870 (2003-09-25)
발명자 / 주소	Niewels,Joachim Johannes
출원인 / 주소	Husky Injection Molding Systems, Ltd.
인용정보	피인용 횟수 : 11 인용 특허 : 10

초록

An improved injection molding apparatus for a mold using a valve-gated nozzle that includes a replaceable insert with a bore for aligning and sealing with the valve stem. The replaceable insert is advantageously provided as a wear component in a gate insert.

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What is claimed is: 1. An injection molding apparatus having a mold with a cavity plate including a mold cavity with a gate and a vestige adjacent the gate, an injection nozzle for communicating a flowable material to the mold cavity, the nozzle having a moveable valve stem to selectively start and stop the communication of the flowable material through the nozzle and the gate, the improved apparatus comprising: a replaceable insert installed in the cavity plate adjacent the vestige, the replaceable insert containing the gate having a passageway and a sealing portion that receive an end portion of the valve stem to stop the communication of the flowable material through the gate, the sealing portion being adjacent the vestige and having a diameter smaller than that of a top surface of the vestige immediately adjacent the sealing portion. 2. The apparatus of claim 1, wherein the passageway has a substantial clearance with the valve stem to allow backflow of the flowable material along the valve stem as the end portion of the valve stem is received in the passageway. 3. The apparatus of claim 1, wherein the passageway has a close fit with the valve stem and wherein the valve stem has a feature which permits backflow of the flowable material along the valve stem as the end portion of the valve stem is received in the passageway. 4. The apparatus of claim 3, wherein the feature is at least one elongated slot on an outside surface of the valve stem. 5. The apparatus of claim 3, wherein the sealing portion has a smaller diameter than that of the passageway. 6. An injection molding apparatus having a mold with a cavity plate including a mold cavity with a gate and a vestige adjacent the gate, an injection nozzle for communicating a flowable material to the mold cavity, the nozzle having a moveable valve stem to selectively start and stop the communication of said flowable material through the nozzle and the gate, the improved apparatus comprising: a replaceable insert installed in the cavity plate adjacent the vestige, the replaceable insert containing the gate having a passageway and a sealing portion that receive an end portion of the valve stem to stop the communication of flowable material through the gate, the passageway having a close fit with the valve stem, the valve stem having a feature which permits backflow of flowable material along the valve stem as the end portion of the valve stem is received in the passageway, the sealing portion being adjacent the vestige and having a diameter smaller than that of a top surface of the vestige, the sealing portion having a diameter smaller than that of the passageway. 7. A gate insert in a cavity plate of a mold for injection molding, comprising: a body configured to be installed in the cavity plate adjacent a vestige of a cavity in the cavity plate, the body having a passageway and a sealing portion for receiving an end portion of a valve stem of an injection molding nozzle to stop flow of material through the gate insert during an injection molding process, the sealing portion being adjacent the vestige and having a diameter smaller than the diameter of a top surface of the vestige immediately adjacent the sealing portion. 8. A replaceable insert for an injection molding apparatus having a mold with a mold cavity defined therein, the mold cavity having a vestige forming portion, an injection nozzle defining a melt channel for communicating a molten material to said mold cavity, the nozzle having a moveable valve stem to selectively start and stop the communication of said molten material through the melt channel, the replaceable insert comprising: a body that is configured to be received in the mold adjacent the vestige forming portion, a bore configured in the body for connecting the melt channel of the injection nozzle with the mold cavity, the bore having a sealing portion adjacent the mold cavity for receiving an end portion of the valve stem to stop the communication of molten material to the mold cavity, and the sealing portion of a top surface of the bore having a diameter that is smaller than that of the vestige forming portion. 9. The replaceable insert of claim 8, wherein the molding apparatus further includes a gate insert that partially defines a portion of the mold cavity, the replaceable insert configured to be arranged in the gate insert. 10. The replaceable insert of claim 8, wherein the bore has a first portion and a second portion, the second portion being the sealing portion. 11. The replaceable insert of claim 10, wherein the first portion has a substantial clearance with the valve stem to allow backflow of molten material along the valve stem as the end portion of the valve stem is received in the bore. 12. The replaceable insert of claim 10, wherein the first portion is an alignment portion having a close fit with the valve stem. 13. The replaceable insert of claim 12, wherein the end portion of the valve stem aligns with the sealing portion so that the end portion is centered in the sealing portion by the fit between the alignment portion and the valve stem. 14. The replaceable insert of claim 14, wherein the sealing portion has a smaller diameter than the alignment portion. 15. The replaceable insert of claim 8, wherein the valve stem has a backflow feature which permits backflow of the molten material along the valve stem as the end portion of the valve stem is received in the bore. 16. The replaceable insert of claim 15, wherein the backflow feature is at least one elongated slot on an outside surface of the valve stem. 17. The replaceable insert of claim 15, wherein the backflow feature is a reduced diameter portion of the valve stem adjacent the end portion. 18. The replaceable insert of claim 8, wherein the replaceable insert is made of a material having a low thermal conductivity. 19. The replaceable insert of claim 18, wherein the material as titanium. 20. The replaceable insert of claim 18, wherein the material is ceramic. 21. The replaceable insert of claim 8, further comprising a cavity insert that partially defines a portion of the mold cavity, the replaceable insert being located in the cavity insert. 22. An injection molding apparatus having a mold with a mold cavity defined therein, and a gate insert defining a portion of the mold cavity including a vestige forming portion, an injection nozzle for communicating a molten material to said mold cavity, the nozzle having a moveable valve stem to selectively start and stop the communication of the molten material through the nozzle and the gate insert, the improved apparatus comprising: a replaceable insert installed in the gate insert adjacent the vestige forming portion, the replaceable insert having a bore that receives an end portion of the valve stem to stop the communication of molten material through the gate insert, the bore having a sealing portion adjacent the vestige forming portion and an alignment portion having a close fit with the valve stem to center the end portion of the valve stem in the sealing portion, the sealing portion of the bore having a diameter smaller than that of a top surface of the vestige forming portion and smaller than that of the alignment portion, the valve stem having a feature which permits backflow of molten material along the valve stem as the end portion of the valve stem is received in the bore. 23. A gate insert and a replaceable insert for an injection mold, the gate insert defining a portion of a mold cavity, the replaceable insert located in the gate insert adjacent the mold cavity, the replaceable insert comprising: a body having a bore with a sealing portion for receiving a valve stem to stop flow of molten material through the bore, the replaceable insert being removable from the gate inert, the portion of the mold cavity defined by the gate insert has a vestige forming portion adjacent the sealing portion of the replaceable insert, the vestige forming portion having a diameter, the sealing portion having a diameter smaller than that of a top surface of the vestige forming portion.

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Apparatus for injection molded articles

초록

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Apparatus for injection molded articles

초록

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이 특허에 인용된 특허 (10)

이 특허를 인용한 특허 (11)

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IPC 상세정보(version : 201201)

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