GB713841A - Improvements in or relating to the production by extrusion of thin-walled seamless tubes of thermoplastic materials - Google Patents

Improvements in or relating to the production by extrusion of thin-walled seamless tubes of thermoplastic materials

Info

Publication number
GB713841A
GB713841A GB7457/51A GB745751A GB713841A GB 713841 A GB713841 A GB 713841A GB 7457/51 A GB7457/51 A GB 7457/51A GB 745751 A GB745751 A GB 745751A GB 713841 A GB713841 A GB 713841A
Authority
GB
United Kingdom
Prior art keywords
lip
tube
flexible
die
rigid
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
Application number
GB7457/51A
Inventor
William Berry
Charles Robert Oswin
John Archibald Douglas Ewart
Edward Kenneth Ham
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.)
British Cellophane Ltd
Original Assignee
British Cellophane 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.)
Filing date
Publication date
Application filed by British Cellophane Ltd filed Critical British Cellophane Ltd
Priority to GB7457/51A priority Critical patent/GB713841A/en
Publication of GB713841A publication Critical patent/GB713841A/en
Expired legal-status Critical Current

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
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles

Abstract

<PICT:0713841/IV (a)/1> Apparatus for the extrusion of thin-walled seamless tubing of thermoplastic material comprises an extrusion die provided with a flexible circular external lip, a pin substantially coaxial with the hole of the die and provided with a rigid circular internal lip, the flexible and rigid lips bounding the annular extrusion orifice formed therebetween, and contour-adjusting means for the flexible external lip, the contour-adjusting means operating between the flexible lip and a rigid reaction member mounted on the die. The pin together with the rigid internal lip may be moved relative to the die, e.g. by means of adjusting bolts in opposed pairs at right-angles, for effecting coarse adjustment of the orifice. The contour-adjusting means may comprise bolts, preferably capable of fine adjustment, arranged around the outer edge of the flexible external lip. Alternatively, thrusting rods controlled by electrical solenoids, or hydraulic means comprising pistons actuated by controlled water-pressure, may be used. The extruded tube of molten thermoplastic material may be inflated before it has solidified and it may be maintained in the expanded condition until it has solidified. Driven nip-rolls may enclose an elongated bubble of compressed fluid inside the extruded tube between the die and the nip. The flexible lip may be a replaceable strip of springy metal, e.g. nickel-plated spring steel. The extruded tube may be caused to pass over a fluid-cooled mandrel, mounted co-axially with the orifice and having a larger diameter than that of the orifice. The mandrel may be hollow and may be cooled by the circulation therethrough of water or other fluid. It may be ring-shaped, cylindrical or conical, and it may be supported directly from the pin. A blast of cold air may be directed on to the outside of the extruded tube. The thermoplastic material from which the tube is made may be cellulose acetate or other cellulose ester, polyethylene, polyvinyl chloride, a vinylidene chloride/vinyl chloride copolymer, a styrene/isobutylene copolymer, a polyamide such as polyhexamethylene adipamide or a polyester such as poly-ethylene glycol terephthalate. As shown, the molten film-forming material is forced through the annular orifice 1 in die 2, which is provided with a flexible circular lip 3, a pin 4 and a rigid circular internal lip 5. Bolts 6 are arranged at regular intervals around the outer edge of lip 3 for adjusting the contour of the wall of the tube which is being extruded. The bolts 6 operate between the lip and the rigid reaction member 7. The hot extruded tube is passed over the water-cooled mandrel 9. Water inlet and outlet conduits 11, 12 pass through pin 4. The tube 8 is inflated by air supplied by tube 10. By adjusting bolts 6, the contour of the lip 3 is adjusted so that tube 8 has a substantially uniform wall-thickness at all points of its periphery. Tubes having a wall-thickness after solidification of 0.02 inch down to 0.0015 inch or less may be obtained.
GB7457/51A 1951-03-30 1951-03-30 Improvements in or relating to the production by extrusion of thin-walled seamless tubes of thermoplastic materials Expired GB713841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7457/51A GB713841A (en) 1951-03-30 1951-03-30 Improvements in or relating to the production by extrusion of thin-walled seamless tubes of thermoplastic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7457/51A GB713841A (en) 1951-03-30 1951-03-30 Improvements in or relating to the production by extrusion of thin-walled seamless tubes of thermoplastic materials

Publications (1)

Publication Number Publication Date
GB713841A true GB713841A (en) 1954-08-18

Family

ID=9833462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7457/51A Expired GB713841A (en) 1951-03-30 1951-03-30 Improvements in or relating to the production by extrusion of thin-walled seamless tubes of thermoplastic materials

Country Status (1)

Country Link
GB (1) GB713841A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3074108A (en) * 1960-04-25 1963-01-22 Phillips Petroleum Co Apparatus for biaxially orienting thermoplastic film
US3349435A (en) * 1965-09-21 1967-10-31 Danadyne Inc Precision die for manufacture of foamed plastics and the like
GB2162119A (en) * 1984-07-28 1986-01-29 Reifenhaeuser Masch Extrusion moulding tool for synthetic thermoplastic materials
GB2162118A (en) * 1984-07-28 1986-01-29 Reifenhaeuser Masch Extrusion moulding tool unit for synthetic thermoplastic materials
GB2237236A (en) * 1989-10-26 1991-05-01 Reifenhaeuser Masch A process and apparatus for the thickness error correction of an extruded blown foil
WO2016061625A1 (en) * 2014-10-20 2016-04-28 Vinidex Pty Limited An extrusion tooling for pipe extrusion
CN114654696A (en) * 2022-04-13 2022-06-24 三杰节能新材料股份有限公司 Temperature control mechanism for processing large polyethylene heat-preservation outer protection bent pipe

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3074108A (en) * 1960-04-25 1963-01-22 Phillips Petroleum Co Apparatus for biaxially orienting thermoplastic film
US3349435A (en) * 1965-09-21 1967-10-31 Danadyne Inc Precision die for manufacture of foamed plastics and the like
GB2162119A (en) * 1984-07-28 1986-01-29 Reifenhaeuser Masch Extrusion moulding tool for synthetic thermoplastic materials
GB2162118A (en) * 1984-07-28 1986-01-29 Reifenhaeuser Masch Extrusion moulding tool unit for synthetic thermoplastic materials
FR2568168A1 (en) * 1984-07-28 1986-01-31 Reifenhaeuser Masch EXTRUDER, USED IN PARTICULAR FOR THE EXTRUSION OF A THERMOPLASTIC MATERIAL
GB2237236A (en) * 1989-10-26 1991-05-01 Reifenhaeuser Masch A process and apparatus for the thickness error correction of an extruded blown foil
GB2237236B (en) * 1989-10-26 1993-06-09 Reifenhaeuser Masch A process for the operation of a blown foil extruder unit and a blown foil extruder unit adapted for the process
WO2016061625A1 (en) * 2014-10-20 2016-04-28 Vinidex Pty Limited An extrusion tooling for pipe extrusion
CN114654696A (en) * 2022-04-13 2022-06-24 三杰节能新材料股份有限公司 Temperature control mechanism for processing large polyethylene heat-preservation outer protection bent pipe
CN114654696B (en) * 2022-04-13 2023-08-29 三杰节能新材料股份有限公司 Temperature control mechanism for processing large-sized polyethylene heat-insulation outer protection bent pipe

Similar Documents

Publication Publication Date Title
GB1190472A (en) Method and apparatus for the production of Tubular Film
US3907961A (en) Flexible cylinder for cooling an extruded pipe
JPS5824253B2 (en) Method and apparatus for producing double-walled plastic tubes having an outer wall with annular or helical folds
JPS62158017A (en) Device and method of manufacturing thin tube
GB1383001A (en) Method and apparatus of making oriented tubular film
GB1089863A (en) Process and apparatus for the continuous production of biaxially stretched tubular films of linear polyesters
US3239881A (en) Apparatus for impact extrusion
US3265789A (en) Method and apparatus for forming thermoplastic films
US3111714A (en) Self-centering extrusion die
US2952874A (en) Air ring for use in the manufacture of thermoplastic tubing
GB1444107A (en) Cooling apparatus for plastic tubular film made by a blow-head
GB713841A (en) Improvements in or relating to the production by extrusion of thin-walled seamless tubes of thermoplastic materials
US3583033A (en) Valving die for in-line extrusion of thermoplastic material
US3270371A (en) Axial extruder head with mandrel for extruding hollow profiles
US4176155A (en) Method and apparatus for making film
JPS6471729A (en) Method and device for manufacturing mesh film
US3742105A (en) Method for producing a seamless tubing
US3714309A (en) Manufacture of plastic film
US3446884A (en) Extrusion process and apparatus for producing a thermoplastic pipe having a glossy surface
US3307219A (en) Manufacture of plastic film
ES352526A1 (en) Process for the Manufacture of Tubular Polyethylene Films
JPS581654B2 (en) Extrusion die for the production of plastic tubes
GB1152533A (en) Method and apparatus for producing a tubular film or tube of thermoplastic polymeric material.
US3249670A (en) Plastic tube extrusion process
GB1271694A (en) Process and apparatus for the production of tubular films from thermoplastic materials