CA2167467A1 - Hot runner nozzle - Google Patents
Hot runner nozzleInfo
- Publication number
- CA2167467A1 CA2167467A1 CA002167467A CA2167467A CA2167467A1 CA 2167467 A1 CA2167467 A1 CA 2167467A1 CA 002167467 A CA002167467 A CA 002167467A CA 2167467 A CA2167467 A CA 2167467A CA 2167467 A1 CA2167467 A1 CA 2167467A1
- Authority
- CA
- Canada
- Prior art keywords
- hot runner
- heating
- runner nozzle
- cap
- nozzle according
- 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000003466 welding Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 239000012212 insulator Substances 0.000 claims abstract description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
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
- B29C45/20—Injection nozzles
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Nozzles (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Percussion Or Vibration Massage (AREA)
Abstract
A hot runner nozzle (10) with a heating element (22) which is, in particular, strip-shaped or tubular and surrounds a material pipe (12) and heat conducting pipe (27) together with intermediate insulator (26) has, on a shank (30), material-guiding nozzle tips (46) into which heating pins (44) project.
They are conductively connected, in particular welded, to the upper region of a conducting member (40) which can be a steel ring (40) which is electrically insulated from adjacent housing and heating element surfaces but is conductively connected to the lower end (23) of the heating element in a welding region (38).
The welding region (38) is located in an angular zone (W) between two heating pins (44).
They are conductively connected, in particular welded, to the upper region of a conducting member (40) which can be a steel ring (40) which is electrically insulated from adjacent housing and heating element surfaces but is conductively connected to the lower end (23) of the heating element in a welding region (38).
The welding region (38) is located in an angular zone (W) between two heating pins (44).
Description
Hot runner nozzle Descri~tion The present invention relates to a hot runner nozzle according to the preamble of Claim 1.
Typical devices of this type are described, for example, in US-A 4 273 525 and in NL-A-7 900 927. Flowable plastic which is supplied to a material pipe can be brought to elevated temperature therein and can be injected into a mould under high pressure. External heaters have generally proven beneficial for the material pipe, including those disclosed in DE-U-8 039 584 and in DE-A1-2 716 950.
Various proposals have been made for evenin~ out the temperature trend in the interior of the nozzle and for concentrating heat as close as possible to the moulding nest; examples are given in E~-B-0 137 888. Significant drawbac~s or individual heating coils and of a far prefer~ed nozzle body are discussed in DE-U-8 618 162. In that document, the discharge of heat to the cold tool is to be reduced in that the orifice of the nozzle tip is at an insulating distance from the foremost nozzle part which, furthermore, is to consist of a material which is a poor conductor of heat such as chromium steel. A conical heating element is provided directly on the inlet duct according to DE-A1-4 137 720.
An important aim of the invention is to improve such devices and to increase the economic viability, in particular, of runnerless injection moulding. Several articles are to be moulded simultaneously or one article several times.
The main features of the invention are specified in the characterizing part of Claim 1. Claims 2 to 9 relate to embodiments.
In a hot runner nozzle consisting of a material pipe which is rigidly connected at the head to connecting members between which mutually insulated current supply lines are each conductively connected to one end of an, in particular, strip-shaped or tubular heating element which surrounds the material pipe together with an intermediate insulator and of a shank which is rigidly connected to a lower housing part and to a cap, the latter and/or the end of the material pipe comprising at least one material-guiding nozzle tip, the invention proposes according to the characterizing part of Claim 1 that the lower end of the heating element be electrically connected to a conducting member having at least one heating pin projecting into an associated nozzle tip. It is thus possible to introduce the heating current into the nozzle tip and in this way to prevent a discharge of heat to the cold tool by continued dispensation of heat. The heated tip allows the material for the article to be produced to be introduced into the moulding nest at a suitably high temperature.
According to Claim 2, the conducting member is a distributing ring which consists, in particular, of steel and is electrically insulated from adjacent heating element faces but is electrically conductively connected to one or more heating pins. This can be embodied in a constructionally desirable manner and allows rapid reliable installation.
According to Claim 3, the conducting member can be electrically insulated from the shank and the cap. This design enables the conventional construction of externally heated hot runner nozzles to be maintained compactly.
If the or each heating pin is conductively connected, in particular welded, at least to the upper region of the conducting member according to Claim 4, electrical connections which withstand the high operating stresses even after prolonged use are obtained. In particular with heating elements operated at low voltage, for example of 5 V, very high currents flow so it is important to guarantee low transition resistances at the contact points.
The measure from Claim 5 according to which the or each heating pin penetrates the cap in an insulated manner contributes to the advantageous transmission of heat. Therefore, this is not heated directly but via the nozzle tips which are connected integrally or rigidly to it according to Claim 6.
According to Claim 7, as many heating pins as nozzle tips are advantageously provided, preferably four, so multiple injection can take place equally advantageously at all nozzle tips. It is desirable if the nozzle tips according to Claim 8 are distributed radially symmetrically with respect to the material pipe, in particular over a diameter which does not fall below or falls only slightly below the diameter of the cap. The nozzle tips consequently move outwardly relative to the material pipe, so multiple injection moulding can easily be carried out even with complicated shapes.
According to Claim 9, a further feature of the invention resides in the fact that the welding region is located in an angular zone between two heating pins so, on the one hand, a good conductive connection to the lower end of the heating element and, on the other hand, ade~uate insulation from the heating pins are possible. A permanently reliable electrical connection is therefore guaranteed even with small dimensions.
According to Claim 10, the invention generally proposes that the heating power in the nozzle tips be controllable by dividing the current over the heatin~ pins. This allows the heating pin diameter to be dimensioned in adaptation to the electrical resistivity of the selected material in such a way that the heating resistors connected electrically in parallel can supply the respectively allocated nozzle tips with the heating power re~uired to produce a specific article. Different temperatures can therefore easily be produced at individual nozzle tips during operation, which may be of considerable advantage for some shaping operations.
Further features, details and advantages of the invention will emerge from the wording of the claims and from the following description of embodiments given with reference to the drawings.
Figure 1 is an axlal sectional view of a hot runner nozzle.
Figure 2 is a cross-sectional view along line II-II in Figure 1.
Figure 3 is a side view of a hot runner nozzle, partially in section.
Figure 4 is a front view in the direction of the arrow IV in Figure 3.
Figure 5 is an electric circuit diagram.
A hot runner nozzle designated in its entirety by 10 has a material pipe 12 and a head 14 which is welded to an upper housing part 16. The material pipe 12 is surrounded by a heat conducting pipe 27 and a heating pipe 22 with internal insulation 26. Once a current supplying ring 17 with an electrode bush 20 has been placed on the upper end of the heating pipe and has been conductively connected to it, a lower housing part 18 is welded to the upper part 16 and, in turn, is connected to the shank 30 by peripheral welding.
The shank 30 is provided at its lower end with nozzle tips 46 into which there penetrates a respective heating pin 44 which penetrates a cap 34 and is fastened electrically conductively in a steel ring 40. The steel ring 40 is electrically conductively connected to the lower end 23 of the heating pipe 22 at a thic3~ened region 38 at the lower end 13 of the material pipe 12 in a welding region 38. The heating pipe 22 has slots 24, 25 at selected points for altering the effective cross section in such a way that substantially uniform temperature control is achieved over the entire length in the interior of the hot runner nozzle 10 during operation.
Figure 2 shows that the weldlng region 38 extends over an angular zone W which extends between two heating pins 44 and ensures that the insulating distance from them is adequate.
Figures 3 and 4 show the arrangement of the nozzle pins 46 in conjunction with Figure 1. Their axes or centres lie in a circle of diameter d, so the actual tips are located far out without the diameter D of the cap 34 being exceeded. Figure 4, in conjunction with Figure 1, at the same time shows that the electrode 20 and a counter electrode 28 are guided out laterally, and it should be noted that the current supply lines 20, 21 in Figure 1 are shown rotated through 45 in order to make them visible. A preliminary chamber bush 50 is also indicated in Figure 1, and a hollow insulating chamber 48 can be seen between shank 30 and heating pipe 22, by means of which the discharge of heat to the preliminary chamber bush 50 can be markedly checked.
The schematic illustration in Figure 5 shows that the current is supplied via the electrode 20 to the heating element 22 which is shown in a meandering fashion here and from which the current flux continues via the welding region 38 to the steel ring 40.
The heating pins 44 conductively connected thereto penetrate in a conducting manner into the nozzle tips 46 from which the current returns via the shank 30 and the counter electrode 28.
It can be seen that the desired heat concentration in the nozzle tip region can be achieved with simple means without complex circuitry.
The invention is not restricted to the above-described embodiments; rather, numerous modifications are possible.
However, it can be seen that a hot runner nozzle with a heating element 22 which is, in particular, strip-shaped or tubular and comprises a material pipe 12 together with heat conducting pipe 2167~67 27 and intermediate insulator 26 has, on a shank 30, material-guiding nozzle tips 46 into which heating pins 44 project. They are conductively connected, in particular welded, to the upper region of a conducting member 40 which can be a steel ring 40 which is electrically insulated from adjacent housing and heating element surfaces~but is conductively connected to the lower end 23 of the heating element in a welding region 38. ~he welding region 38 is located in an angular zone W between two heating pins 44. Four nozzle pins 46 which are integral with or rigidly connected to the cap 34 are preferably distributed radially symmetrically over a diameter d not or only slightly falling below the diameter D of the cap 34.
All features and advantages emerging from the claims, the description and the drawings, including constructional details and spatial arrangements, can be essential to the invention both individually and in any combination.
Typical devices of this type are described, for example, in US-A 4 273 525 and in NL-A-7 900 927. Flowable plastic which is supplied to a material pipe can be brought to elevated temperature therein and can be injected into a mould under high pressure. External heaters have generally proven beneficial for the material pipe, including those disclosed in DE-U-8 039 584 and in DE-A1-2 716 950.
Various proposals have been made for evenin~ out the temperature trend in the interior of the nozzle and for concentrating heat as close as possible to the moulding nest; examples are given in E~-B-0 137 888. Significant drawbac~s or individual heating coils and of a far prefer~ed nozzle body are discussed in DE-U-8 618 162. In that document, the discharge of heat to the cold tool is to be reduced in that the orifice of the nozzle tip is at an insulating distance from the foremost nozzle part which, furthermore, is to consist of a material which is a poor conductor of heat such as chromium steel. A conical heating element is provided directly on the inlet duct according to DE-A1-4 137 720.
An important aim of the invention is to improve such devices and to increase the economic viability, in particular, of runnerless injection moulding. Several articles are to be moulded simultaneously or one article several times.
The main features of the invention are specified in the characterizing part of Claim 1. Claims 2 to 9 relate to embodiments.
In a hot runner nozzle consisting of a material pipe which is rigidly connected at the head to connecting members between which mutually insulated current supply lines are each conductively connected to one end of an, in particular, strip-shaped or tubular heating element which surrounds the material pipe together with an intermediate insulator and of a shank which is rigidly connected to a lower housing part and to a cap, the latter and/or the end of the material pipe comprising at least one material-guiding nozzle tip, the invention proposes according to the characterizing part of Claim 1 that the lower end of the heating element be electrically connected to a conducting member having at least one heating pin projecting into an associated nozzle tip. It is thus possible to introduce the heating current into the nozzle tip and in this way to prevent a discharge of heat to the cold tool by continued dispensation of heat. The heated tip allows the material for the article to be produced to be introduced into the moulding nest at a suitably high temperature.
According to Claim 2, the conducting member is a distributing ring which consists, in particular, of steel and is electrically insulated from adjacent heating element faces but is electrically conductively connected to one or more heating pins. This can be embodied in a constructionally desirable manner and allows rapid reliable installation.
According to Claim 3, the conducting member can be electrically insulated from the shank and the cap. This design enables the conventional construction of externally heated hot runner nozzles to be maintained compactly.
If the or each heating pin is conductively connected, in particular welded, at least to the upper region of the conducting member according to Claim 4, electrical connections which withstand the high operating stresses even after prolonged use are obtained. In particular with heating elements operated at low voltage, for example of 5 V, very high currents flow so it is important to guarantee low transition resistances at the contact points.
The measure from Claim 5 according to which the or each heating pin penetrates the cap in an insulated manner contributes to the advantageous transmission of heat. Therefore, this is not heated directly but via the nozzle tips which are connected integrally or rigidly to it according to Claim 6.
According to Claim 7, as many heating pins as nozzle tips are advantageously provided, preferably four, so multiple injection can take place equally advantageously at all nozzle tips. It is desirable if the nozzle tips according to Claim 8 are distributed radially symmetrically with respect to the material pipe, in particular over a diameter which does not fall below or falls only slightly below the diameter of the cap. The nozzle tips consequently move outwardly relative to the material pipe, so multiple injection moulding can easily be carried out even with complicated shapes.
According to Claim 9, a further feature of the invention resides in the fact that the welding region is located in an angular zone between two heating pins so, on the one hand, a good conductive connection to the lower end of the heating element and, on the other hand, ade~uate insulation from the heating pins are possible. A permanently reliable electrical connection is therefore guaranteed even with small dimensions.
According to Claim 10, the invention generally proposes that the heating power in the nozzle tips be controllable by dividing the current over the heatin~ pins. This allows the heating pin diameter to be dimensioned in adaptation to the electrical resistivity of the selected material in such a way that the heating resistors connected electrically in parallel can supply the respectively allocated nozzle tips with the heating power re~uired to produce a specific article. Different temperatures can therefore easily be produced at individual nozzle tips during operation, which may be of considerable advantage for some shaping operations.
Further features, details and advantages of the invention will emerge from the wording of the claims and from the following description of embodiments given with reference to the drawings.
Figure 1 is an axlal sectional view of a hot runner nozzle.
Figure 2 is a cross-sectional view along line II-II in Figure 1.
Figure 3 is a side view of a hot runner nozzle, partially in section.
Figure 4 is a front view in the direction of the arrow IV in Figure 3.
Figure 5 is an electric circuit diagram.
A hot runner nozzle designated in its entirety by 10 has a material pipe 12 and a head 14 which is welded to an upper housing part 16. The material pipe 12 is surrounded by a heat conducting pipe 27 and a heating pipe 22 with internal insulation 26. Once a current supplying ring 17 with an electrode bush 20 has been placed on the upper end of the heating pipe and has been conductively connected to it, a lower housing part 18 is welded to the upper part 16 and, in turn, is connected to the shank 30 by peripheral welding.
The shank 30 is provided at its lower end with nozzle tips 46 into which there penetrates a respective heating pin 44 which penetrates a cap 34 and is fastened electrically conductively in a steel ring 40. The steel ring 40 is electrically conductively connected to the lower end 23 of the heating pipe 22 at a thic3~ened region 38 at the lower end 13 of the material pipe 12 in a welding region 38. The heating pipe 22 has slots 24, 25 at selected points for altering the effective cross section in such a way that substantially uniform temperature control is achieved over the entire length in the interior of the hot runner nozzle 10 during operation.
Figure 2 shows that the weldlng region 38 extends over an angular zone W which extends between two heating pins 44 and ensures that the insulating distance from them is adequate.
Figures 3 and 4 show the arrangement of the nozzle pins 46 in conjunction with Figure 1. Their axes or centres lie in a circle of diameter d, so the actual tips are located far out without the diameter D of the cap 34 being exceeded. Figure 4, in conjunction with Figure 1, at the same time shows that the electrode 20 and a counter electrode 28 are guided out laterally, and it should be noted that the current supply lines 20, 21 in Figure 1 are shown rotated through 45 in order to make them visible. A preliminary chamber bush 50 is also indicated in Figure 1, and a hollow insulating chamber 48 can be seen between shank 30 and heating pipe 22, by means of which the discharge of heat to the preliminary chamber bush 50 can be markedly checked.
The schematic illustration in Figure 5 shows that the current is supplied via the electrode 20 to the heating element 22 which is shown in a meandering fashion here and from which the current flux continues via the welding region 38 to the steel ring 40.
The heating pins 44 conductively connected thereto penetrate in a conducting manner into the nozzle tips 46 from which the current returns via the shank 30 and the counter electrode 28.
It can be seen that the desired heat concentration in the nozzle tip region can be achieved with simple means without complex circuitry.
The invention is not restricted to the above-described embodiments; rather, numerous modifications are possible.
However, it can be seen that a hot runner nozzle with a heating element 22 which is, in particular, strip-shaped or tubular and comprises a material pipe 12 together with heat conducting pipe 2167~67 27 and intermediate insulator 26 has, on a shank 30, material-guiding nozzle tips 46 into which heating pins 44 project. They are conductively connected, in particular welded, to the upper region of a conducting member 40 which can be a steel ring 40 which is electrically insulated from adjacent housing and heating element surfaces~but is conductively connected to the lower end 23 of the heating element in a welding region 38. ~he welding region 38 is located in an angular zone W between two heating pins 44. Four nozzle pins 46 which are integral with or rigidly connected to the cap 34 are preferably distributed radially symmetrically over a diameter d not or only slightly falling below the diameter D of the cap 34.
All features and advantages emerging from the claims, the description and the drawings, including constructional details and spatial arrangements, can be essential to the invention both individually and in any combination.
Claims (10)
1. Hot runner nozzle (10) consisting of a material pipe (12) rigidly connected at the head (14) to connecting members (16; 18) between which mutually insulated current supply lines (20; 28) are conductively connected to a respective end of a heating element (22) which is, in particular, strip-shaped or tubular and surrounds the material pipe (12) together with an intermediate insulator (26) and of a shank (30) rigidly connected to a lower housing part (18) and to a cap (34), the cap (34) and/or the end (13) of the material pipe comprising at least one material-guiding nozzle tip (46), characterized in that the lower end (23) of the heating element is electrically connected to a conducting member (40) having at least one heating pin (44) projecting into an associated nozzle tip (46).
2. Hot runner nozzle according to Claim 1, characterized in that the conducting member is a distributing ring (40) which consists, in particular, of steel and is electrically insulated from adjacent heating element surfaces but is electrically conductively connected to one or more heating pins (44).
3. Hot runner nozzle according to Claim 1 or 2, characterized in that the conducting member (40) is electrically insulated from the shank (30) and the cap (34).
4. Hot runner nozzle according to one of Claims 1 to 3, characterized in that the or each heating pin (44) is conductively connected, in particular welded, at least to the upper region of the conducting member (40).
5. Hot runner nozzle according to one of Claims 1 to 4, characterized in that the or each heating pin (44) passes through the cap (34).
6. Hot runner nozzle according to one of Claims 1 to 5, characterized in that the or each nozzle tip (46) is integrally or rigidly connected to the cap (34).
7. Hot runner nozzle according to one of Claims 1 to 6, characterized in that as many heating pins (44) as nozzle tips (46) are provided.
8. Hot runner nozzle according to Claim 6 or 7, characterized in that the nozzle tips (46) are distributed radially symmetrically with respect to the material pipe (12), in particular over a diameter (d) not or only slightly falling below the diameter (D) of the cap (34).
9. Hot runner nozzle according to one of Claims 2 to 8, characterized in that the welding region (38) is located in an angular zone (W) between two heating pins (44).
10. Hot runner nozzle according to one of Claims 1 to 9, characterized in that the heating power in the nozzle tips (46) is controllable via the division of current over the heating pins (44), in particular by the choice of material and dimensioning thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEU.M.29502937.4 | 1995-02-22 | ||
| DE29502937U DE29502937U1 (en) | 1995-02-22 | 1995-02-22 | Hot runner nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2167467A1 true CA2167467A1 (en) | 1996-08-23 |
Family
ID=8004294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002167467A Abandoned CA2167467A1 (en) | 1995-02-22 | 1996-01-17 | Hot runner nozzle |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0728568A1 (en) |
| KR (1) | KR960031111A (en) |
| CN (1) | CN1134342A (en) |
| CA (1) | CA2167467A1 (en) |
| DE (1) | DE29502937U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173039A (en) * | 2011-03-22 | 2011-09-07 | 朱晓华 | Energy-saving heater of charging barrel in injection molding equipment |
| CN114603789B (en) * | 2022-03-17 | 2023-11-28 | 山东春雨节水灌溉设备有限公司 | One-outlet multi-point hot nozzle and processing technology |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63236615A (en) * | 1987-03-26 | 1988-10-03 | Sanri Kk | Method and apparatus for runnerless injection molding of synthetic resin by means of intermittent cooling |
| CA1261576A (en) * | 1988-04-13 | 1989-09-26 | Jobst U. Gellert | Injection molding nozzle having multiple thickness heating element and method of manufacture |
| DE4127036C2 (en) * | 1991-08-16 | 1995-05-04 | Guenther Herbert Gmbh | Hot runner nozzle |
| JP2534609B2 (en) * | 1993-02-16 | 1996-09-18 | 世紀株式会社 | Injection mold probe and runnerless injection molding equipment |
-
1995
- 1995-02-22 DE DE29502937U patent/DE29502937U1/en not_active Expired - Lifetime
- 1995-12-20 EP EP95120178A patent/EP0728568A1/en not_active Withdrawn
-
1996
- 1996-01-17 CA CA002167467A patent/CA2167467A1/en not_active Abandoned
- 1996-02-01 CN CN96102579A patent/CN1134342A/en active Pending
- 1996-02-22 KR KR1019960004098A patent/KR960031111A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR960031111A (en) | 1996-09-17 |
| EP0728568A1 (en) | 1996-08-28 |
| DE29502937U1 (en) | 1995-04-20 |
| CN1134342A (en) | 1996-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |