CA2409785A1 - Apparatus for heating injection molding fluid - Google Patents

Apparatus for heating injection molding fluid Download PDF

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Publication number
CA2409785A1
CA2409785A1 CA002409785A CA2409785A CA2409785A1 CA 2409785 A1 CA2409785 A1 CA 2409785A1 CA 002409785 A CA002409785 A CA 002409785A CA 2409785 A CA2409785 A CA 2409785A CA 2409785 A1 CA2409785 A1 CA 2409785A1
Authority
CA
Canada
Prior art keywords
inner tube
ring
heater assembly
tube
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002409785A
Other languages
French (fr)
Other versions
CA2409785C (en
Inventor
Harald Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westfall Acquisition III Inc
Original Assignee
Mold Hotrunner Solutions Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mold Hotrunner Solutions Inc filed Critical Mold Hotrunner Solutions Inc
Priority to CA2409785A priority Critical patent/CA2409785C/en
Priority to US10/693,796 priority patent/US7147458B2/en
Priority to EP03024322A priority patent/EP1413418B1/en
Priority to AT03024322T priority patent/ATE337156T1/en
Priority to DE60307761T priority patent/DE60307761T2/en
Publication of CA2409785A1 publication Critical patent/CA2409785A1/en
Application granted granted Critical
Publication of CA2409785C publication Critical patent/CA2409785C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/74—Heating or cooling of the injection unit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C45/281—Drive means therefor

Abstract

A heater assembly for mounting around a fluid flow channel in an injection molding apparatus, the heater assembly comprising: an inner tube comprising a first heat conductive material having a first coefficient of thermal expansion, the inner tube having a selected longitudinal length, an inner surface, an outer surface; a first ring having an inner surface engaged around the outer surface of the inner tube along a short selected length of the longitudinal length of the inner tube, the first ring comprising a second material having a second coefficient of thermal expansion that is less than the first coefficient of thermal expansion; and a heater mechanism that heats the inner tube to a selected elevated temperature.

Claims (20)

1. A heater assembly for mounting around a fluid flow channel in an injection molding apparatus, the heater assembly comprising:
an inner tube comprising a first heat conductive material having a first coefficient of thermal expansion, the inner tube having a selected longitudinal length, an inner surface, an outer surface;
a first ring having an inner surface engaged around the outer surface of the inner tube along a short selected length of the longitudinal length of the inner tube, the first ring comprising a second material having a second coefficient of thermal expansion that is less than the first coefficient of thermal expansion; and a heater mechanism that heats the inner tube to a selected elevated temperature.
2. The heater assembly of claim 1 further comprising an outer tube receiving and mounted around the outer surface of the inner tube, the first ring mounting the outer tube in a fixed position around the outer surface of the inner tube, the outer tube being mounted such that an inner surface of the outer tube is spaced a distance from the outer surface of the inner tube.
3. The heater assembly of claim 2 wherein the heater mechanism is mounted within the space between the inner ring and the outer ring.
4. The heater assembly of claim 3 further comprising a second ring having an inner surface engaged around the outer surface of the inner tube along a second short selected length of the longitudinal length of the inner tube, the second ring comprising a material having a coefficient of thermal expansion that is less than the first coefficient of thermal expansion.
5. The heater assembly of claim 4 wherein the second ring mounts the outer tube in the fixed position around the outer surface of the inner tube in cooperation with the first ring.
6. The heater assembly of claim 1 wherein the short selected length extends from a first terminal end of the inner tube, the first ring being mounted at and around the first terminal end of the inner tube.
7. The heater assembly of claim 4 wherein the second short selected length extends from a second terminal end of the inner tube, the second ring being mounted at and around the second terminal end of the inner tube.
8. The heater assembly of claim 4 wherein the short selected length extends from a first terminal end of the inner tube, the first ring being mounted at and around the first terminal end of the inner tube and wherein the second short selected length extends from a second terminal end of the inner tube, the second ring being mounted at and around the 5 second terminal end of the inner tube.
9. The heater assembly of claim 1 wherein the inner tube and the first ring expand radially upon heating to select elevated temperatures, the second material of the first ring being selected such that the first ring expands less radially than the inner tube expands radially upon said heating, the first ring restricting radial expansion upon said heating.
10. The heater assembly of claim 4 wherein the inner tube and the second ring expand radially upon heating to select elevated temperatures, the material of the second ring being selected such that the second ring expands less radially than the inner tube expands radially upon said heating, the second ring restricting radial expansion upon said heating.
11. The heater assembly of claim 4 wherein the inner tube and the first ring expand radially upon heating to select elevated temperatures, the second material of the first ring being selected such that the first ring expands less radially than the inner tube expands radially upon said heating, the first ring restricting radial expansion of the inner tube upon said heating; and, wherein the inner tube and the second ring expand radially upon heating to select elevated temperatures, the material of the second ring being selected such that the second ring expands less radially than the inner tube expands radially upon said heating, the second ring restricting radial expansion upon said heating.
12. The heater assembly of claim 2 wherein the heater mechanism is mounted in the enclosed space in engagement with the outer surface of the inner tube and being spaced a distance from the inner surface of the outer tube.
13. The heater assembly of claim 12 wherein the heater mechanism comprises an electrically conductive material of high resistance connected to a source of electrical energy for controllably heating the material by controlled application of electrical energy to the material.
14. A heater assembly for mounting around a fluid flow channel in an injection molding apparatus, the heater assembly comprising:
an inner tube comprising a first heat conductive material, the inner tube having a selected longitudinal length, an inner surface and an outer surface;
a first ring having an inner surface engaged around the outer surface of the inner tube along a short selected length of the longitudinal length of the inner tube;
a second ring having an inner surface engaged around the outer surface of the inner tube along a second short selected length of the longitudinal length of the inner tube;
a heater mechanism mounted around and in engagement with the outer surface of the inner tube.
15. The heater assembly of claim 14 wherein the tube comprises a first material having a first coefficient of thermal expansion, the first and second rings comprise a second material having a second coefficient of thermal expansion, the first coefficient of thermal expansion being greater the second coefficient of thermal expansion.
16. The heater assembly of claim 14 wherein the tube and the first ring expand radially upon heating to select elevated temperatures, the tube comprising a first material, the first and second rings comprising a second material, the second material of the first and second rings being selected such that the first and second rings expand less radially than the tube expands radially upon said heating, the first and second rings restricting radial expansion of the tube upon said heating.
17. The heater assembly of claim 1 in which the inner tube has a body length and a slot extending through the body length of the inner tube.
18. The heater assembly of claim 1 in which the inner surface of the first ring has screw teeth and the outer surface of the inner tube has screw teeth on said short selected length where the first ring engages around the outer surface of the inner tube, said screw teeth on the first ring and the inner tube being complementary.
19. The heater assembly of claim 4 in which the inner surface of the second ring has screw teeth and the outer surface of the inner tube has screw teeth on said short selected length where the second ring engages around the outer surface of the inner tube, said screw teeth on the second ring and the inner tube being complementary.
20. The heater assembly of claim 14 in which said first and second rings are made from a shape memory alloy that causes the first and second rings to reduce in diameter when the first and second rings are heated above a threshold temperature so as to positively clamp the inner tube on a fluid flow channel.
CA2409785A 2002-10-25 2002-10-25 Apparatus for heating injection molding fluid Expired - Lifetime CA2409785C (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA2409785A CA2409785C (en) 2002-10-25 2002-10-25 Apparatus for heating injection molding fluid
US10/693,796 US7147458B2 (en) 2002-10-25 2003-10-23 Apparatus for heating injection molding fluid
EP03024322A EP1413418B1 (en) 2002-10-25 2003-10-24 Apparatus for heating injection molding fluid
AT03024322T ATE337156T1 (en) 2002-10-25 2003-10-24 DEVICE FOR HEATING FLOWABLE MATERIALS DURING INJECTION MOLDING
DE60307761T DE60307761T2 (en) 2002-10-25 2003-10-24 Device for heating flowable materials during injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2409785A CA2409785C (en) 2002-10-25 2002-10-25 Apparatus for heating injection molding fluid

Publications (2)

Publication Number Publication Date
CA2409785A1 true CA2409785A1 (en) 2004-04-25
CA2409785C CA2409785C (en) 2010-09-07

Family

ID=32046591

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2409785A Expired - Lifetime CA2409785C (en) 2002-10-25 2002-10-25 Apparatus for heating injection molding fluid

Country Status (5)

Country Link
US (1) US7147458B2 (en)
EP (1) EP1413418B1 (en)
AT (1) ATE337156T1 (en)
CA (1) CA2409785C (en)
DE (1) DE60307761T2 (en)

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WO2013043307A1 (en) * 2011-09-20 2013-03-28 Husky Injection Molding Systems Ltd. Mold-tool system including component having, at least in part, anodized aluminum material coupled to electrically-resistive heating element
WO2013082023A1 (en) * 2011-11-28 2013-06-06 Husky Injection Molding Systems, Ltd. Mold-tool system having body where heat transfer from heater assembly to the heat-receiving body is improved
DE102012101400B4 (en) * 2012-02-22 2013-10-31 Günther Heisskanaltechnik Gmbh Hot runner nozzle with an electric heating element
CN102791050A (en) * 2012-08-01 2012-11-21 福州市台江区振斌高效电磁聚能科技研究所 Heater of plastic extruding machine
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US10131079B2 (en) * 2016-07-27 2018-11-20 Douglas Christopher Hepler Side gate nozzle assembly with a washer made of a shape memory alloy
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US20200316837A1 (en) * 2019-04-02 2020-10-08 Synventive Molding Solutions, Inc. Nozzle Heater
CN114932631B (en) * 2022-04-18 2023-05-30 湖南工学院 Automatic feeding device of polycarboxylate water reducer

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Also Published As

Publication number Publication date
DE60307761T2 (en) 2007-08-30
EP1413418A1 (en) 2004-04-28
DE60307761D1 (en) 2006-10-05
US7147458B2 (en) 2006-12-12
CA2409785C (en) 2010-09-07
EP1413418B1 (en) 2006-08-23
ATE337156T1 (en) 2006-09-15
US20040241277A1 (en) 2004-12-02

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Effective date: 20221025