CA2218832A1 - Industrial part heater - Google Patents
Industrial part heater Download PDFInfo
- Publication number
- CA2218832A1 CA2218832A1 CA 2218832 CA2218832A CA2218832A1 CA 2218832 A1 CA2218832 A1 CA 2218832A1 CA 2218832 CA2218832 CA 2218832 CA 2218832 A CA2218832 A CA 2218832A CA 2218832 A1 CA2218832 A1 CA 2218832A1
- Authority
- CA
- Canada
- Prior art keywords
- heater
- main body
- measuring point
- imbedded
- electric part
- 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.)
- Abandoned
Links
- 239000004020 conductor Substances 0.000 claims abstract description 13
- 230000001404 mediated effect Effects 0.000 claims abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 229910001369 Brass Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000010951 brass Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
-
- 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
- B29C45/2737—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
-
- 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
- B29C2045/274—Thermocouples or heat sensors
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Resistance Heating (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Control Of Resistance Heating (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
An electric part heater has a main body of highly heat-conductive material, an electrical heater element imbedded in the body, a jacket of poorly heat-conductive material surrounding the body, and a thermostat element imbedded in the body and having a measuring point. A secondary body of poorly heat-conductive material is imbedded in the main body and surrounds the measuring point so that a response of the measuring point to temperature change of the main body is mediated by the secondary body.
Description
CA 022l8832 l997-l0-22 ~NWSTRIAI, PA~ HEATER
SPFCTFICATION
FIELD OF T~B INVEN~ION
The present invention relates to a heater. More particularly this invention concerns an industrial-type electri-cal part heater, for instance used to heat a nozzle of an extrud-er.
BAC~GROUND OF TH~S lNV~ lON
A standard part heater, for instance used to heat a nozzle of an extruder, typically comprises a main body of highly heat-conductive material, an electrical heater element imbedded in the body, a jacket of poorly heat-conductive material sur-rounding the body, and a thermostat element imbedded in the body and having a measuring point. In a standard application the lS heater is tubular and adapted to fit around the nozzle being heated. The highly heat-conductive main body, typically of brass or aluminum, is in direct contact with the normally stainless-steel part being heated for best heat transfer.
The thermostat element imbedded in the main body serves to monitor its temperature and control electrical energization of the heater element via a controller and power supply. The CA 022l8832 l997-l0-22 measuring point is usually at an end of the heater and the thermostat element extends normally axially substantially the full length of the heater from the measuring point.
The response of the measuring point is therefore relatively fast, as it is surrounded by the highly heat-conduc-tive main body. As a result the controller will shut off ener-gization of the heater coil when the main body has reached the desired temperature. This is disadvantageous since the part being heated is itself normally jacketed in or formed by a substantially less effective conductor, often stainless steel.
The result is some substantial variation of the temperature of the part being heated from what is desired, as there is a lag between when the part heats up and when the main body of the heater is at the desired temperature.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved industrial part heater.
Another object is the provision of such an improved industrial part heater which overcomes the above-given disadvan-tages, that is which accurately maintains the part being heatedat the desired temperature.
~UNMARY OF THB INVENTION
An electric part heater has according to the invention a main body of highly heat-conductive material, an electrical heater element imbedded in the body, a jacket of poorly heat-conductive material surrounding the body, and a thermostat element imbedded in the body and having a measuring point. A
secondary body of poorly heat-conductive material is imbedded according to the invention in the main body and surrounds the measuring point so that a response of the measuring point to temperature change of the main body is mediated by the secondary body.
Thus the heat transmitted directly from the electrical heater element to the main body must pass through the less conductive secondary body before it gets to the measuring point of the thermostat element. Thus this measuring point will heat up at roughly the same rate as the part being heated so that the controller and power supply connected to it will be able to accurately energize the heater to maintain a uniform temperature in this part.
The secondary body according to the invention is made of stainless steel. In addition the heater is shaped to fit complementarily with a part of a predetermined low thermal conductivity material. The secondary body is made of the same low thermal conductivity material.
The thermostat element in accordance with the invention is radially outward of the radial inner surface of the body.
Furthermore the secondary body extends flush with the radial inner surface of the main body.
BRIBF DB8CRIPTION OF T~B DRA~ING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a partly diagrammatic axial section through the heater element according to the invention; and FIG. 2 is an end view partly in section of the heater element.
SPECIFIC DESCRIPTION
As shown in the drawing a heater 1 according to this invention is basically tubular, centered on an axis A of a nozzle N through which material is extruded. The heater 1 comprises a helical or meandering electric heating coil 2 formed of a resis-tive wire and imbedded in a cylindrical body 3 of a highly heat-conducting metal such as aluminum or brass. A cylindrically tubular jacket 4 of stainless steel surrounds the coil 2 and body 3 and an axially extending thermostat element 5 is imbedded in the body 3 radially inward of the coil 2. A connector 8 extends at one end from the coil 2 and is connected to a power supply 9 that energizes it and heats the element 1.
The thermostat element 5 has a measuring point 6 that is connected to a controller 10 that is itself connected to the power supply 9 to regulate the energization of the heater coil 2 and, therefore, of the heater 1. This measuring point 6 is located at one end of the heater 1 and is sandwiched radially between a pair of stainless-steel rings 6 of substantially lower thermal conductivity than the brass or aluminum of the body 3.
The nozzle N normally is formed of or jacketed in stainless steel also.
Thus according to the invention the thermostat point 6 will respond to heating and cooling of the heater 1 in a fairly sluggish manner, just like the nozzle N itself, and is not immediately heated and cooled by the coil 2 as same is energized.
The low thermal conductivity of the rings 7 surrounding the point 6 ensure that this point 6 will heat up and cool down at roughly the same rate as the nozzle N so that its temperature will correspond fairly closely to that of the nozzle N.
SPFCTFICATION
FIELD OF T~B INVEN~ION
The present invention relates to a heater. More particularly this invention concerns an industrial-type electri-cal part heater, for instance used to heat a nozzle of an extrud-er.
BAC~GROUND OF TH~S lNV~ lON
A standard part heater, for instance used to heat a nozzle of an extruder, typically comprises a main body of highly heat-conductive material, an electrical heater element imbedded in the body, a jacket of poorly heat-conductive material sur-rounding the body, and a thermostat element imbedded in the body and having a measuring point. In a standard application the lS heater is tubular and adapted to fit around the nozzle being heated. The highly heat-conductive main body, typically of brass or aluminum, is in direct contact with the normally stainless-steel part being heated for best heat transfer.
The thermostat element imbedded in the main body serves to monitor its temperature and control electrical energization of the heater element via a controller and power supply. The CA 022l8832 l997-l0-22 measuring point is usually at an end of the heater and the thermostat element extends normally axially substantially the full length of the heater from the measuring point.
The response of the measuring point is therefore relatively fast, as it is surrounded by the highly heat-conduc-tive main body. As a result the controller will shut off ener-gization of the heater coil when the main body has reached the desired temperature. This is disadvantageous since the part being heated is itself normally jacketed in or formed by a substantially less effective conductor, often stainless steel.
The result is some substantial variation of the temperature of the part being heated from what is desired, as there is a lag between when the part heats up and when the main body of the heater is at the desired temperature.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved industrial part heater.
Another object is the provision of such an improved industrial part heater which overcomes the above-given disadvan-tages, that is which accurately maintains the part being heatedat the desired temperature.
~UNMARY OF THB INVENTION
An electric part heater has according to the invention a main body of highly heat-conductive material, an electrical heater element imbedded in the body, a jacket of poorly heat-conductive material surrounding the body, and a thermostat element imbedded in the body and having a measuring point. A
secondary body of poorly heat-conductive material is imbedded according to the invention in the main body and surrounds the measuring point so that a response of the measuring point to temperature change of the main body is mediated by the secondary body.
Thus the heat transmitted directly from the electrical heater element to the main body must pass through the less conductive secondary body before it gets to the measuring point of the thermostat element. Thus this measuring point will heat up at roughly the same rate as the part being heated so that the controller and power supply connected to it will be able to accurately energize the heater to maintain a uniform temperature in this part.
The secondary body according to the invention is made of stainless steel. In addition the heater is shaped to fit complementarily with a part of a predetermined low thermal conductivity material. The secondary body is made of the same low thermal conductivity material.
The thermostat element in accordance with the invention is radially outward of the radial inner surface of the body.
Furthermore the secondary body extends flush with the radial inner surface of the main body.
BRIBF DB8CRIPTION OF T~B DRA~ING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a partly diagrammatic axial section through the heater element according to the invention; and FIG. 2 is an end view partly in section of the heater element.
SPECIFIC DESCRIPTION
As shown in the drawing a heater 1 according to this invention is basically tubular, centered on an axis A of a nozzle N through which material is extruded. The heater 1 comprises a helical or meandering electric heating coil 2 formed of a resis-tive wire and imbedded in a cylindrical body 3 of a highly heat-conducting metal such as aluminum or brass. A cylindrically tubular jacket 4 of stainless steel surrounds the coil 2 and body 3 and an axially extending thermostat element 5 is imbedded in the body 3 radially inward of the coil 2. A connector 8 extends at one end from the coil 2 and is connected to a power supply 9 that energizes it and heats the element 1.
The thermostat element 5 has a measuring point 6 that is connected to a controller 10 that is itself connected to the power supply 9 to regulate the energization of the heater coil 2 and, therefore, of the heater 1. This measuring point 6 is located at one end of the heater 1 and is sandwiched radially between a pair of stainless-steel rings 6 of substantially lower thermal conductivity than the brass or aluminum of the body 3.
The nozzle N normally is formed of or jacketed in stainless steel also.
Thus according to the invention the thermostat point 6 will respond to heating and cooling of the heater 1 in a fairly sluggish manner, just like the nozzle N itself, and is not immediately heated and cooled by the coil 2 as same is energized.
The low thermal conductivity of the rings 7 surrounding the point 6 ensure that this point 6 will heat up and cool down at roughly the same rate as the nozzle N so that its temperature will correspond fairly closely to that of the nozzle N.
Claims (7)
1. An electric part heater comprising:
a main body of highly heat-conductive material;
an electrical heater element imbedded in the body;
a jacket of poorly heat-conductive material surrounding the body;
a thermostat element imbedded in the body and having a measuring point; and a secondary body of poorly heat-conductive material imbedded in the main body and surrounding the measuring point, whereby a response of the measuring point to temperature change of the main body is mediated by the secondary body.
a main body of highly heat-conductive material;
an electrical heater element imbedded in the body;
a jacket of poorly heat-conductive material surrounding the body;
a thermostat element imbedded in the body and having a measuring point; and a secondary body of poorly heat-conductive material imbedded in the main body and surrounding the measuring point, whereby a response of the measuring point to temperature change of the main body is mediated by the secondary body.
2. The electric part heater defined in claim 1 wherein the secondary body is made of stainless steel.
3. The electric part heater defined in claim 1 wherein the heater is shaped to fit complementarily with a part of a predetermined low thermal conductivity material, the secondary body being made of the same low thermal conductivity material.
4. An electric part heater comprising:
a generally cylindrically tubular main body of aluminum or brass having an inner surface and an outer surface and centered on an axis;
an insulated electrical heater coil imbedded in the body radially outward of its inner surface and centered on the axis;
a generally cylindrically tubular jacket of stainless steel surrounding the body at its outer surface;
an axially elongated tubular stainless-steel thermostat element imbedded in the body immediately inward of the inner surface thereof and having a measuring point at an axial end of the body; and a secondary body of poorly heat-conductive material imbedded in the main body and surrounding the measuring point, whereby a response of the measuring point to temperature change of the main body is mediated by the secondary body.
a generally cylindrically tubular main body of aluminum or brass having an inner surface and an outer surface and centered on an axis;
an insulated electrical heater coil imbedded in the body radially outward of its inner surface and centered on the axis;
a generally cylindrically tubular jacket of stainless steel surrounding the body at its outer surface;
an axially elongated tubular stainless-steel thermostat element imbedded in the body immediately inward of the inner surface thereof and having a measuring point at an axial end of the body; and a secondary body of poorly heat-conductive material imbedded in the main body and surrounding the measuring point, whereby a response of the measuring point to temperature change of the main body is mediated by the secondary body.
5. The electric part heater defined in claim 4 wherein the thermostat element is radially outward of the radial inner surface of the body.
6. The electric part heater defined in claim 4 wherein the secondary body extends flush with the radial inner surface of the main body.
7. The electric part heater defined in claim 4 wherein the heater is shaped to fit complementarily with a part of a predetermined low thermal conductivity material, the secondary body being made of the same low thermal conductivity material.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29618715.1 | 1996-10-28 | ||
| DE29618715U DE29618715U1 (en) | 1996-10-28 | 1996-10-28 | Electric heater |
| DE19707802.8 | 1997-02-27 | ||
| DE19707802 | 1997-02-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2218832A1 true CA2218832A1 (en) | 1998-04-28 |
Family
ID=26034321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2218832 Abandoned CA2218832A1 (en) | 1996-10-28 | 1997-10-22 | Industrial part heater |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH10144451A (en) |
| CA (1) | CA2218832A1 (en) |
| DE (1) | DE19744823A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19943192A1 (en) * | 1999-09-09 | 2001-04-05 | Hotset Heizpatronen Zubehoer | Tubular heating element |
| CN105128273A (en) * | 2015-08-06 | 2015-12-09 | 苏州市博奥塑胶电子有限公司 | Nozzle of injection molding machine |
-
1997
- 1997-09-26 JP JP29926797A patent/JPH10144451A/en active Pending
- 1997-10-10 DE DE19744823A patent/DE19744823A1/en not_active Withdrawn
- 1997-10-22 CA CA 2218832 patent/CA2218832A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE19744823A1 (en) | 1998-04-30 |
| JPH10144451A (en) | 1998-05-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |