CA2028575A1 - Tubular die for extrusion, more particularly a blow head - Google Patents
Tubular die for extrusion, more particularly a blow headInfo
- Publication number
- CA2028575A1 CA2028575A1 CA002028575A CA2028575A CA2028575A1 CA 2028575 A1 CA2028575 A1 CA 2028575A1 CA 002028575 A CA002028575 A CA 002028575A CA 2028575 A CA2028575 A CA 2028575A CA 2028575 A1 CA2028575 A1 CA 2028575A1
- Authority
- CA
- Canada
- Prior art keywords
- tubular die
- tubular
- die
- extrusion
- blow head
- 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
- 238000001125 extrusion Methods 0.000 title claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000010096 film blowing Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000002020 sage Nutrition 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/872—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone characterised by differential heating or cooling
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/865—Heating
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/87—Cooling
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92647—Thickness
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Abstract of the Disclosure.
A tubular die for extrusion and more particularly a blow head for the production of tubular film of thermoplastic resin, consisting of an inner ring or core and an outer ring, between which an annular die passage is defined. In order to heat and possibly cool sections of such a tubular die in a simple manner, at least one of the said rings (1 and 2) of the tubular die is subdivided into a plurality of temperature controlling sectors, which are provided with holes (4) or other forms of recesses, in which electrical heating cartridges (5) are mounted (figure 1).
A tubular die for extrusion and more particularly a blow head for the production of tubular film of thermoplastic resin, consisting of an inner ring or core and an outer ring, between which an annular die passage is defined. In order to heat and possibly cool sections of such a tubular die in a simple manner, at least one of the said rings (1 and 2) of the tubular die is subdivided into a plurality of temperature controlling sectors, which are provided with holes (4) or other forms of recesses, in which electrical heating cartridges (5) are mounted (figure 1).
Description
2~2~7~
A Tubular Die for Extrusion, more partirularly a Blow Head.
The invention relates to a tubular die for extru~ion and more particularly to a blow head for the production of tubular film of thermoplastic resin, con~i~ting of an inner ring or core and an outer ring, between which an annular die pa~sage is defined.
Such tubular die~ have been disclosed for instance in the German patent publication 2,140,194 ~3 and the German patents 2,947,293 and 2,950,003.
In order to extrude tube~ or to blo~ mold tubular film with a constant wall or film thickness along the entire periphery, it is nece~ary to be able to adjust the mass temperature of the fused resin in the annular die gap of the extrusion die by suitable modification of the vi~co~ity in order to regulate the flow of the emersing fused resin.
In the prior art tub~llar dies the temperature control segments or temperature control sectors are provided with ducts or holes through which a cooling or heating fluid may be passed in order by a suitable a increase or lowering of the temperature of the re~pective temperature control sector to change the temperature pattern around the periphery of the tubular die in the desired manner. In the case of known tubular die~ the cooling or heating fluid is air, oil or some other liquid or gaseous material, which is able to supply or abstract heat to or from the temperature control sectors.
2 ~ 7~
The heating of the temperature control sectors of a tubular die by flowing fluids is a complicated method in view of the connections for supply and return lines and owing to the necessity of keeping fluid on standby at the requisite temperature~
Furthermore, plant failure may be caused by leaks in the connections .
Accordingly one object of the invention is to provide a tubular die of the ini~ially specified type whose temperature control sectors may be heated and, if required, cooled in a simpler 10 manner than hitherto.
In order to achieve this object a tubular die of the type specified with an inner and an outer ring is so designed that at least one of said rings is divided in a plurality of temperature control sectors, in which electrical heating cartridges are placed 15 in holes or recesses.
In the tubular die in accordance with the invention the electrical heating cartridges or heating elements may be readily accommodated in suitable holes or other recesseq. The electrical leads needed for the supply of electrical energy may be arranged in 20 a simple manner and call for very little maintenance.
In order to heat the temperature control segments it is only necessary to supply the respectively associated heating cartridges with electrical power. If a cooling effect is required no current is then supplied to the respective heating cartridge so 25 that the respective temperature control segment will cool down to the temperature of the mass of fused resin emerging from the tubular die.
The tubular die in accordance with the invention iR more particularly suitable in connection with a film blowing extruder as 30 described in the German patents 2,947,293 and 2,950,003.
One working example of the invention will now be deRcribed in detail with reference to the drawing.
Figure 1 is a longitudinal section through a tubular die.
A Tubular Die for Extrusion, more partirularly a Blow Head.
The invention relates to a tubular die for extru~ion and more particularly to a blow head for the production of tubular film of thermoplastic resin, con~i~ting of an inner ring or core and an outer ring, between which an annular die pa~sage is defined.
Such tubular die~ have been disclosed for instance in the German patent publication 2,140,194 ~3 and the German patents 2,947,293 and 2,950,003.
In order to extrude tube~ or to blo~ mold tubular film with a constant wall or film thickness along the entire periphery, it is nece~ary to be able to adjust the mass temperature of the fused resin in the annular die gap of the extrusion die by suitable modification of the vi~co~ity in order to regulate the flow of the emersing fused resin.
In the prior art tub~llar dies the temperature control segments or temperature control sectors are provided with ducts or holes through which a cooling or heating fluid may be passed in order by a suitable a increase or lowering of the temperature of the re~pective temperature control sector to change the temperature pattern around the periphery of the tubular die in the desired manner. In the case of known tubular die~ the cooling or heating fluid is air, oil or some other liquid or gaseous material, which is able to supply or abstract heat to or from the temperature control sectors.
2 ~ 7~
The heating of the temperature control sectors of a tubular die by flowing fluids is a complicated method in view of the connections for supply and return lines and owing to the necessity of keeping fluid on standby at the requisite temperature~
Furthermore, plant failure may be caused by leaks in the connections .
Accordingly one object of the invention is to provide a tubular die of the ini~ially specified type whose temperature control sectors may be heated and, if required, cooled in a simpler 10 manner than hitherto.
In order to achieve this object a tubular die of the type specified with an inner and an outer ring is so designed that at least one of said rings is divided in a plurality of temperature control sectors, in which electrical heating cartridges are placed 15 in holes or recesses.
In the tubular die in accordance with the invention the electrical heating cartridges or heating elements may be readily accommodated in suitable holes or other recesseq. The electrical leads needed for the supply of electrical energy may be arranged in 20 a simple manner and call for very little maintenance.
In order to heat the temperature control segments it is only necessary to supply the respectively associated heating cartridges with electrical power. If a cooling effect is required no current is then supplied to the respective heating cartridge so 25 that the respective temperature control segment will cool down to the temperature of the mass of fused resin emerging from the tubular die.
The tubular die in accordance with the invention iR more particularly suitable in connection with a film blowing extruder as 30 described in the German patents 2,947,293 and 2,950,003.
One working example of the invention will now be deRcribed in detail with reference to the drawing.
Figure 1 is a longitudinal section through a tubular die.
3 2~2~
Figure 2 is a cross section taken through the tubular die taken on the line I-I of figure 1.
The main parts of the tubular die shown in the drawing are 5 a central core 1 and an outer ring 2 able to be centered relative to the same. Between the core 1 and the outer ring 2 the annular die gap 3 is formed.
The outer ring 2 i~ provided with holes 4 evenly spaced out along its circumference in order to receive heating cartridges.
10 The holes 4 are set obliquely and after the insertion of the heating cartridges 5 their upper end may be sealed by a plug 6, which is welded in place. The electrical leads 7 are connected through a radial hole with the respective hole 4.
Figure 2 is a cross section taken through the tubular die taken on the line I-I of figure 1.
The main parts of the tubular die shown in the drawing are 5 a central core 1 and an outer ring 2 able to be centered relative to the same. Between the core 1 and the outer ring 2 the annular die gap 3 is formed.
The outer ring 2 i~ provided with holes 4 evenly spaced out along its circumference in order to receive heating cartridges.
10 The holes 4 are set obliquely and after the insertion of the heating cartridges 5 their upper end may be sealed by a plug 6, which is welded in place. The electrical leads 7 are connected through a radial hole with the respective hole 4.
Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
A tubular die for extrusion and more particularly a blow head for the production of tubular film of thermoplastic resin, consisting of an inner ring or a inner core and an outer ring, between which an annular die passage is defined characterized in that at least one of said rings (1 and 2) is divided in a plurality of temperature controlling sectors which are provided with recesses (4), in which electrical heating cartridges (5) are mounted.
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
A tubular die for extrusion and more particularly a blow head for the production of tubular film of thermoplastic resin, consisting of an inner ring or a inner core and an outer ring, between which an annular die passage is defined characterized in that at least one of said rings (1 and 2) is divided in a plurality of temperature controlling sectors which are provided with recesses (4), in which electrical heating cartridges (5) are mounted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3936239.6 | 1989-10-31 | ||
| DE3936239A DE3936239A1 (en) | 1989-10-31 | 1989-10-31 | RING NOZZLE FOR EXTRESS PRESSES, PREFERABLY FILM BLOW HEAD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2028575A1 true CA2028575A1 (en) | 1991-05-01 |
Family
ID=6392588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002028575A Abandoned CA2028575A1 (en) | 1989-10-31 | 1990-10-25 | Tubular die for extrusion, more particularly a blow head |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0425797A1 (en) |
| JP (1) | JPH03175012A (en) |
| CA (1) | CA2028575A1 (en) |
| DE (1) | DE3936239A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7695263B2 (en) | 2001-03-05 | 2010-04-13 | Windmoeller And Hoelscher Kg | Blown film die for producing tubular film |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4236443B4 (en) * | 1992-10-28 | 2005-02-24 | Windmöller & Hölscher Kg | Method for controlling the temperature of a film blowing head for the production of plastic tubular films |
| DE19541296C2 (en) * | 1995-11-06 | 1999-07-01 | Windmoeller & Hoelscher | Device for heating the film sectors of a film tube extruded from a film blowing head |
| DE10122856B4 (en) * | 2001-03-05 | 2006-08-10 | Windmöller & Hölscher Kg | Blown film die for producing tubular film from thermoplastics has inner and outer cooling rings for film which are divided into sectors which air can be blown on to film under different conditions |
| DE10242175B4 (en) * | 2002-09-10 | 2005-01-05 | Windmöller & Hölscher Kg | Apparatus and process for the production of self-cleaning foils by blow molding |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3412231A (en) * | 1966-03-29 | 1968-11-19 | Int Paper Co | Extrusion die including electrical cartridge heaters |
| DE2232930A1 (en) * | 1971-07-06 | 1973-02-01 | Hepworth Plastics Ltd | METHOD AND DEVICE FOR THE PRODUCTION OF PIPES OF EQUAL WALL THICKNESS IN THE EXTRUSION PROCESS |
| DE3006566A1 (en) * | 1980-02-21 | 1981-08-27 | Windmöller & Hölscher, 4540 Lengerich | METHOD FOR REGULATING THE FILM THICKNESS OF FLAT FILMS PRODUCED IN FLAT FILM EXTRUSION PLANTS |
| EP0180571A3 (en) * | 1984-09-11 | 1986-11-26 | Erwin Hartl | Extrusion die arrangement and automatic centering extrusion method |
| US4882104A (en) * | 1987-04-03 | 1989-11-21 | Cincinnati Milacron, Inc. | Method of controlling the thickness of an extruded plastic article |
-
1989
- 1989-10-31 DE DE3936239A patent/DE3936239A1/en not_active Withdrawn
-
1990
- 1990-09-11 EP EP90117491A patent/EP0425797A1/en not_active Withdrawn
- 1990-10-25 CA CA002028575A patent/CA2028575A1/en not_active Abandoned
- 1990-10-26 JP JP2290616A patent/JPH03175012A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7695263B2 (en) | 2001-03-05 | 2010-04-13 | Windmoeller And Hoelscher Kg | Blown film die for producing tubular film |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3936239A1 (en) | 1991-05-02 |
| EP0425797A1 (en) | 1991-05-08 |
| JPH03175012A (en) | 1991-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |