GB964563A - Production of synthetic organic thermoplastic polymeric film - Google Patents
Production of synthetic organic thermoplastic polymeric filmInfo
- Publication number
- GB964563A GB964563A GB27399/62A GB2739962A GB964563A GB 964563 A GB964563 A GB 964563A GB 27399/62 A GB27399/62 A GB 27399/62A GB 2739962 A GB2739962 A GB 2739962A GB 964563 A GB964563 A GB 964563A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mandrel
- tubular film
- temperature
- film
- die
- 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.)
- Expired
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
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
- B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
-
- 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
-
- 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
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
964,563. Producing tubular thermoplastic film. E. I. DU PONT DE NEMOURS & CO. July 17, 1962 [July 17, 1961], No. 27399/62. Heading B5B. As shown in the drawing, polymeric thermoplastic material is extruded from an annular die 11 in the form of continuous tubing 12 which is advanced over hollow cooling mandrel 13, having a smooth surface and a circular cross-section, by roller advancing means positioned downstream from the mandrel. The mandrel is adjustably suspended a predetermined distance from the face of the die 11 by a hollow support post 14 and is composed of a section 13a tapering towards the die and a cylindrical section 13b. Cooling fluid is passed through a coil 15 embedded in the wall of the mandrel by means of inlet tube 16 and outlet tube 17. Both the die and the mandrel are preferably rotated in the same direction at the same angular velocity to increase the uniformity of the wall thickness of the tubular film. Air or other gas is introduced through the feed line 18 at a pressure sufficient to expand the freshly extruded tubing to a diameter that is slightly larger (e.g. up to about 20 mils. larger) than the diameter of the section 13b of the mandrel. As the tubing is advanced over the mandrel excess gas is vented through the holes 19 located in a circumferential groove 20 in the wall of the mandrel and communicating with its interior. From the interior of the mandrel the gas passes through the post 14 to the atmosphere or other zone maintained at a slightly lower pressure than that within the portion of the tubular film intermediate between the die face and the mandrel. A temperature sensing signal-generating element 21, in this embodiment shown as a thermocouple junction in contact with the exterior of tubular film 12, is positioned to sense the temperature of the film at a point in its advance over the mandrel within the region or belt bounded on the upstream side by the junction of the sections 13a and 13b of the mandrel and on the downstream side by the circumferential line of the tubular film downstream from which the film is in thermal equilibrium with the surface of the mandrel, i.e. downstream from which the temperature of the tubular film is no longer decreasing due to the cooling action of the mandrel. Voltage signals from the element 21 are transmitted to a conventional electropneumatic transducer 22, which converts them to proportionate pneumatic signals which actuate a conventional temperature indicator 23 (which may be a recording indicator) and which simultaneously are fed to inverse derivative pneumatic conventional controller 24, the output signal from which is fed to a conventional proportionating and resetting controller 25. Pneumatic signals from the latter are applied to actuate diaphragm control valve 26 in gas supply line 18 in such a manner that an increase in voltage signal from temperature sensing element 21 will reduce the rate of gas flow through the line 18 and vice versa. Thus, an increase in temperature of the tubular film as sensed by the element 21 will bring about a proportionate decrease in the gaseous pressure within the portion of the tubular film at any moment between the die face and the cooling mandrel, said decrease in gaseous pressure permitting the tubular film to approach more closely the surface of the mandrel, thereby increasing the rate of heat transfer from the film to the mandrel and reducing the temperature of the film, which eliminates the signal that initiated the change described immediately above. Any decrease in the film temperature below the lower limit of a predetermined narrow range will be similarly automatically corrected, the gaseous pressure in this case being temporarily increased. The temperature sensing element 21 may be a non-contacting radiation sensing device, tuned for selective reception of and response to a particular wavelength of energy emanating from the tubular film. The temperature-sensing element may be positioned on the cooling mandrel itself. An electrically responsive control system may be used in place of the pneumatic system, the electropneumatic transducer being replaced by an electronic amplifying transmitter and the pneumatic temperature indicator by an electrically responsive temperature indicator. In the event of the automatic control equipment becoming inoperable, the control valve 26 may be temporarily manually operated in accordance with the readings of the temperature indicator. The invention minimizes the incidence of breaks in the tubular film resulting from over or under-expansion of the tubular film and is more sensitive than devices depending upon the sensing of the gaseous pressure within the tubular film. Specification 858,616 and U.S.A. Specification 2,987,765 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US124438A US3092874A (en) | 1961-07-17 | 1961-07-17 | Production of thermoplastic polymeric film |
Publications (1)
Publication Number | Publication Date |
---|---|
GB964563A true GB964563A (en) | 1964-07-22 |
Family
ID=22414881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27399/62A Expired GB964563A (en) | 1961-07-17 | 1962-07-17 | Production of synthetic organic thermoplastic polymeric film |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1504665A1 (en) |
GB (1) | GB964563A (en) |
LU (1) | LU42011A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113142657A (en) * | 2021-04-08 | 2021-07-23 | 三明学院 | Rotary friction assembly, device for heating non-burning tobacco and control method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2857438C2 (en) * | 1978-04-17 | 1983-12-15 | Windmöller & Hölscher, 4540 Lengerich | Process for optimizing the output of a blown film system |
DE2831212A1 (en) * | 1978-07-15 | 1980-01-24 | Dow Chemical Co | Blown film prodn. control - e.g. in revolving tube process, controls air ring supply responsive to pyrometer signal below frost line |
DE2919472C2 (en) * | 1979-05-15 | 1986-01-16 | Erhardt & Leimer Kg, 8900 Augsburg | Device for the continuous extrusion of tubular films with web width control |
-
1962
- 1962-07-06 LU LU42011D patent/LU42011A1/xx unknown
- 1962-07-17 GB GB27399/62A patent/GB964563A/en not_active Expired
- 1962-07-17 DE DE19621504665 patent/DE1504665A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113142657A (en) * | 2021-04-08 | 2021-07-23 | 三明学院 | Rotary friction assembly, device for heating non-burning tobacco and control method thereof |
CN113142657B (en) * | 2021-04-08 | 2024-05-03 | 三明学院 | Rotary friction assembly, heating non-combustion tobacco device and control method of heating non-combustion tobacco device |
Also Published As
Publication number | Publication date |
---|---|
DE1504665A1 (en) | 1969-09-25 |
LU42011A1 (en) | 1963-01-07 |
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