GB1087720A – Improvements in or relating to the manufacture of thin film
– Google Patents
GB1087720A – Improvements in or relating to the manufacture of thin film
– Google Patents
Improvements in or relating to the manufacture of thin film
Info
Publication number
GB1087720A
GB1087720A
GB23899/63A
GB2389963A
GB1087720A
GB 1087720 A
GB1087720 A
GB 1087720A
GB 23899/63 A
GB23899/63 A
GB 23899/63A
GB 2389963 A
GB2389963 A
GB 2389963A
GB 1087720 A
GB1087720 A
GB 1087720A
Authority
GB
United Kingdom
Prior art keywords
film
conduit
air
tubular film
pressure
Prior art date
1963-06-14
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
Application number
GB23899/63A
Inventor
Peter John Mic Pardoe-Matthews
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.)
King Packaging Ltd
Original Assignee
King Packaging Ltd
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.)
1963-06-14
Filing date
1963-06-14
Publication date
1967-10-18
1963-06-14
Application filed by King Packaging Ltd
filed
Critical
King Packaging Ltd
1963-06-14
Priority to GB23899/63A
priority
Critical
patent/GB1087720A/en
1967-10-18
Publication of GB1087720A
publication
Critical
patent/GB1087720A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
B29C48/92—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
B29C2948/92009—Measured parameter
B29C2948/92019—Pressure
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
B29C2948/92009—Measured parameter
B29C2948/92085—Velocity
B29C2948/92095—Angular velocity
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
B29C2948/92819—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
B29C2948/00—Indexing scheme relating to extrusion moulding
B29C2948/92—Measuring, controlling or regulating
B29C2948/92819—Location or phase of control
B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids
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
Abstract
1,087,720. Making films of uniform thickness. KING PACKAGING Ltd., and P. J. M. PARDOE-MATTHEWS. June 15, 1964 [June 14, 1963], No. 23899/63. Heading B5B. In the manufacture of continuous lengths of flat film sheet by the » trapped bubble » process, in which hot plastic organic polymeric material is extruded through an annular extrusion orifice to form a thin-walled tube which is flattened by being drawn through the nip of a pair of rolls and which is inflated and thereby converted into a tubular film by introducing a gas under pressure into the portion of the tube between the extrusion die and the flattening rolls, the flattened tube being then slit longitudinally, one or more streams of a gas at superatmospheric pressure are directed on to a portion of the exterior surface of the tubular film, for example, as shown in Fig. 2, from a ring of inwardly directed nozzles 25 encircling the tubular film 22 in the zone in which the film is inflated to its maximum diameter. The nozzles 25 communicate with a conduit 26 which in turn communicates with a supply of air maintained at a constant pressure. A branch line 27 leads from the conduit 26 to the controller 28 of an air pressure controlled variable aperture valve 29 in a conduit 24 one end of which communicates with a second supply of air at constant pressure and the other end of which discharges the air into the interior of the tubular film and inflates the tubular film. If the diameter of the tubular film increases so that the wall of the film becomes thinner, the resulting reduction in the distance between the nozzles 25 and the film 22 and consequent increase in the resistance to the discharge of air from the nozzles causes the air pressure at any given point in the conduit to rise and partially close the valve 29. The air pressure in the portion of the conduit 24 between the valve 29 and the inlet to the tubular film will therefore decrease and the wall thickness of the tubular film 22 will increase. Conversely, if the diameter of the film 22 decreases and its wall thickness increases, the air pressure in the conduit 26 will fall, causing the valve 29 to open. The pressure of the air flowing through the conduit 24 into the film 22 will increase and the wall thickness of the film consequently decrease. The variations in the air pressure in the conduit 27 resulting from variations in the wall thickness of the tubular film 22 may be caused to correct the wall thickness of the film by varying the speed of rotation of the rolls which flatten the film and draw it from the extrusion die.
GB23899/63A
1963-06-14
1963-06-14
Improvements in or relating to the manufacture of thin film
Expired
GB1087720A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB23899/63A
GB1087720A
(en)
1963-06-14
1963-06-14
Improvements in or relating to the manufacture of thin film
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB23899/63A
GB1087720A
(en)
1963-06-14
1963-06-14
Improvements in or relating to the manufacture of thin film
Publications (1)
Publication Number
Publication Date
GB1087720A
true
GB1087720A
(en)
1967-10-18
Family
ID=10203111
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB23899/63A
Expired
GB1087720A
(en)
1963-06-14
1963-06-14
Improvements in or relating to the manufacture of thin film
Country Status (1)
Country
Link
GB
(1)
GB1087720A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4069292A
(en)
*
1974-08-28
1978-01-17
Mobil Oil Corporation
Pressure control in tubular thermoplastic extrusion
FR2445216A1
(en)
*
1978-12-25
1980-07-25
Chisso Eng Co Ltd
MACHINE FOR THE PRODUCTION OF BIAXIALLY STRETCHED TUBULAR FILMS
1963
1963-06-14
GB
GB23899/63A
patent/GB1087720A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4069292A
(en)
*
1974-08-28
1978-01-17
Mobil Oil Corporation
Pressure control in tubular thermoplastic extrusion
FR2445216A1
(en)
*
1978-12-25
1980-07-25
Chisso Eng Co Ltd
MACHINE FOR THE PRODUCTION OF BIAXIALLY STRETCHED TUBULAR FILMS
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