GB869140A - An improved method and apparatus for forming film or sheeting - Google Patents

An improved method and apparatus for forming film or sheeting

Info

Publication number
GB869140A
GB869140A GB28527/57A GB2852757A GB869140A GB 869140 A GB869140 A GB 869140A GB 28527/57 A GB28527/57 A GB 28527/57A GB 2852757 A GB2852757 A GB 2852757A GB 869140 A GB869140 A GB 869140A
Authority
GB
United Kingdom
Prior art keywords
ribbon
slot
coating solution
bead
support
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
GB28527/57A
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.)
Kodak Ltd
Original Assignee
Kodak 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
Priority claimed from US609273A external-priority patent/US2932855A/en
Application filed by Kodak Ltd filed Critical Kodak Ltd
Publication of GB869140A publication Critical patent/GB869140A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface 
    • B64C25/50—Steerable undercarriages; Shimmy-damping
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • 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
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • 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

Abstract

<PICT:0869140/IV (a)/1> A composite film is formed on the surface of a continuously moving support by continuously extruding a solution of a film forming material from a stationary hopper on to the surface of the moving support, the viscosity of the dope and the distance of the outlet of the discharge slot of the hopper from the support being such that a layer of dope issuing from the slot forms a self-sustaining and unsupported ribbon bridging the distance between the slot and the support, forming a bead of coating solution against one surface of the ribbon in spaced relation with the support across and in contact with which the ribbon moves in passing to the support, the coatting solution having a viscosity sufficiently low to permit the ribbon to pick up a layer of the coating solution on its surface by a bead action as it moves thereacross, and continuously feeding fresh coating solution to the bead at a rate commensurate with the rate at which it is taken from the bead on the surface of the ribbon to maintain the bead at a given size. As shown in Fig. 2, a high viscosity film dope 11 which is to be cast is extruded under pressure from a hopper (not shown) from a narrow extrusion slot 13 in the form of a ribbon R on to a supporting surface 14, such as a chromium plated wheel or an endless band, continuously moving across the exit end of the hopper. The exit end of the slot 13 is preferably at least 0,030 inch from the supporting surface, and a spacing of 0,060 inch has been found satisfactory. A low viscosity coating solution 21 is allowed to flow by gravity from a second hopper (not shown) through a metering slot 22 which is inclined towards the slot 13 and whose exit end is spaced from and connected to one edge of the exit end of the slot 13 by a wall or surface 24. A bead 23 of the coating solution 21 issuing from the metering slot 22 is formed and maintained in contact with the upper surface of the ribbon R by surface tension forces between the solution and the surface 23 and the lip 25 of the metering slot. In a second embodiment of the invention the coating solution is supplied to the lower surface of the ribbon R and directly engages the supporting surface 14, while in a third embodiment both surfaces of the ribbon R are supplied with coating solution simultaneously.
GB28527/57A 1941-10-31 1957-09-10 An improved method and apparatus for forming film or sheeting Expired GB869140A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB14052/41A GB560659A (en) 1941-10-31 1941-10-31 Improved means for locking fluid pressure actuated jacks
US869140XA 1956-09-11 1956-09-11
US1210645XA 1956-09-11 1956-09-11
US609273A US2932855A (en) 1956-09-11 1956-09-11 Method for forming film or sheeting

Publications (1)

Publication Number Publication Date
GB869140A true GB869140A (en) 1961-05-31

Family

ID=27448232

Family Applications (2)

Application Number Title Priority Date Filing Date
GB14052/41A Expired GB560659A (en) 1941-10-31 1941-10-31 Improved means for locking fluid pressure actuated jacks
GB28527/57A Expired GB869140A (en) 1941-10-31 1957-09-10 An improved method and apparatus for forming film or sheeting

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB14052/41A Expired GB560659A (en) 1941-10-31 1941-10-31 Improved means for locking fluid pressure actuated jacks

Country Status (1)

Country Link
GB (2) GB560659A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102207115B (en) * 2011-03-24 2013-06-19 大连万讯电力仪表有限公司 Travel-adjustable forced grease lubrication straight-travel cylinder
US9290265B2 (en) * 2013-02-22 2016-03-22 Goodrich Corporation Main landing gear compact axle steering

Also Published As

Publication number Publication date
GB560659A (en) 1944-04-14

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