WO1995000313A1 - Procede de production d'un film polyolefinique par trempe a l'eau - Google Patents

Procede de production d'un film polyolefinique par trempe a l'eau Download PDF

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Publication number
WO1995000313A1
WO1995000313A1 PCT/GB1993/001311 GB9301311W WO9500313A1 WO 1995000313 A1 WO1995000313 A1 WO 1995000313A1 GB 9301311 W GB9301311 W GB 9301311W WO 9500313 A1 WO9500313 A1 WO 9500313A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
quench
film
producing
bath
Prior art date
Application number
PCT/GB1993/001311
Other languages
English (en)
Inventor
David Henry Bremner
Joseph William Simpson Miller
Original Assignee
Scott & Fyfe Limited
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 GB919127028A external-priority patent/GB9127028D0/en
Priority to GB9225905A priority Critical patent/GB2262472B/en
Priority to EP92311408A priority patent/EP0549233B1/fr
Application filed by Scott & Fyfe Limited filed Critical Scott & Fyfe Limited
Priority to US08/571,982 priority patent/US5720914A/en
Priority to PCT/GB1993/001311 priority patent/WO1995000313A1/fr
Publication of WO1995000313A1 publication Critical patent/WO1995000313A1/fr

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
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material

Definitions

  • This invention relates to a method of producing a polyolefinic film by a water quench process. It is well known that, in the manufacture of polyolefinic film, particularly polypropylene film, the hot molten polymer is extruded into a water quench bath where the film solidifies. The solidified polypropylene film is taken from the bath and passed over a system of Godet rollers before being fed through a hot air oven in which the film is drawn to induce molecular orientation. Commonly the polypropylene film is slit into a plurality of tapes before being passed into the drawing oven. Polypropylene is a hydrophobic material and therefore, in general, a polypropylene film removed from the water quench bath carries little or no water on its surfaces.
  • Water removal is conventionally effected by providing a period of vertical travel for the polypropylene film in which the water may fall from the film under gravity, and by providing suction slots to suck moisture from the surfaces of the film. It is also known to use scraper bars to assist in the removal of the water from the surfaces of the polypropylene film.
  • Hindered amines are additives commonly included in polypropylene in order to improve the resistance of the polypropylene to ultraviolet degradation. This is particularly important when polypropylene film is to be used in conditions where it is exposed to strong or continuous sunlight and it is important that the polypropylene does not degrade too quickly.
  • a particular example is where the polypropylene film is to be used in the manufacture of intermediate bulk containers.
  • hindered amines and other UV stabilisers are worse than other additives in promoting, water carryover on the surfaces of the polypropylene film removed from a water quench bath. Indeed the water may remain on the surface of the polypropylene film through the Godet rollers, the slitting device, and into the drawing oven. This is most undesirable because the water is present in patches across the width of the polypropylene film and this leads to irregular and inconsistent drawing of the polypropylene film.
  • a method of producing, by a water quench process, a film of a polyolefinic material having a tendency to carry water from the water quench process on the surfaces of the film which includes the step of introducing an active halogen into the quench water and thereby reducing the quantity of water carried on the surfaces of the film leaving the water quench process.
  • a method of producing a film of a polypropylene material which includes ultraviolet stabilisers comprising the steps of extruding a film of the molten polypropylene material into a water quench bath to solidify the film, and introducing into the quench water a compound capable of producing hypochlorite ions in the quench water whereby the quantity of water carried over from the water quench bath on the surfaces of the solidified polypropylene film is reduced.
  • the compound which is introduced into the quench water to reduce water carryover may be in liquid form, for example sodium hypochlorite or bromine water, or solid form, for example an organic compound such as trichloroisocyanuric acid, which reacts with water to produce hypochlorous acid.
  • a tablet of the organic compound may be suspended in the water in the water quench bath, or the water in a separate small feeder tank in the circulation system of the quench water, so that the tablet slowly dissolves in the quench water. Some turbulence in - - the water assists the dissolving of the tablet.
  • active halogen in the quench water can enable increases in the rate of advance of a polypropylene film containing hindered amine UV stabilisers of as much as 307o or more to be obtained without difficulties arising from water carryover into the drawing oven.
  • the halogen be present in the quench water as active halogen and not as the halide ion.
  • Introduction of chloride ions into the quench water by dissolving common salt in the water has been found to produce no reduction in the water carryover effect by polypropylene film containing hindered amine ultraviolet stabilisers.
  • an active halogen such as active chlorine in the quench water has the additional advantageous effect of preventing the build-up of micro-organisms on all metal surfaces exposed to the quench water and particularly on the surfaces of the heat exchanger normally included to control the temperature of the quench water.
  • molten polypropylene containing hindered amine UV stabilisers is extruded through an 800 mm die at a rate of 28 metres per minute into a water quench bath containing approximately 1500 kg of water in continuous recirculation.
  • the water quench system includes a pump, filter equipment and a heat exchanger for maintaining the temperature of the quench water in the region of 26°C.
  • the polypropylene film has an exposure time to the quench water of approximately 2 seconds.
  • the water quench system additionally includes a small cistern with header control, the cistern being separate from the main quench tank.
  • a 225 gm tablet of trichloroisocyanuric acid is dropped into the cistern at or close to the point of greatest turbulence in the cistern, which is at the outlet from the cistern.
  • the tablet may be suspended in a plastic basket or bag near the outlet from the cistern, in which case the tablet may be readily removed if it is found that the active chlorine content of the quench water rises to a level substantially above 12 parts per million.
  • the tablet slowly dissolves in the water circulating through the cistern producing hypochlorous acid and isocyanuric acid. After approximately seven days running, the exhausted tablet is replaced by a new 225 gm tablet of trichloroisocyanuric acid.
  • a marked reduction in water carryover by the solidified polypropylene is observed as compared with the carryover in the absence of the tablet.
  • Tablets of other chlorimides yielding at least 50% available chlorine on dissolution in water may be used in accordance with the present invention instead of trichloroiso ⁇ cyanuric acid, as may also similar soluble compounds of bromine. Satisfactory results in reduction of water carryover have also been achieved by introducing into the quench water an amount of 5% aqueous sodium hypochlorite solution to provide 10 - 12 parts per million of active chlorine in the quench water.
  • Addition of aqueous sodium hypochlorite solution to the quench water may be used in conjunction with the dissolving of a tablet in the water in order to obtain a quick reduction in water carryover if this is found to be very bad, for example on starting up the extrusion process.
  • this level may be maintained by introducing dilute bromine water through a metering pump into the quench water.
  • the compound in a fine particulate form is made into an aqueous slurry and the slurry is fed by a metering pump such as a gear pump into the quench water in the cistern at the desired rate.
  • a metering pump such as a gear pump into the quench water in the cistern at the desired rate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Abstract

On réduit jusqu'à l'éliminer presque totalement la tendance de certains films polyoléfiniques, notamment de films au polypropylène contenant des stabilisateurs UV à amine entravée, à entraîner de l'eau provenant d'un bain de trempe à l'eau, en incorporant jusqu'à 12 parties par million d'un ion hypochlorite ou d'un ion hypobromite dans l'eau du bain de trempe à l'eau.
PCT/GB1993/001311 1991-12-20 1993-06-22 Procede de production d'un film polyolefinique par trempe a l'eau WO1995000313A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB9225905A GB2262472B (en) 1991-12-20 1992-12-11 A method of producing a polyolefinic film by a water quench process
EP92311408A EP0549233B1 (fr) 1991-12-20 1992-12-14 Méthode pour la fabrication de films de polyoléfine par un procédé de trempage avec de l'eau
US08/571,982 US5720914A (en) 1991-12-20 1993-06-22 Method of producing a polyolefinic film by a water quench process
PCT/GB1993/001311 WO1995000313A1 (fr) 1991-12-20 1993-06-22 Procede de production d'un film polyolefinique par trempe a l'eau

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919127028A GB9127028D0 (en) 1991-12-20 1991-12-20 A method of producing a polyolefinic film by a water quench process
PCT/GB1993/001311 WO1995000313A1 (fr) 1991-12-20 1993-06-22 Procede de production d'un film polyolefinique par trempe a l'eau

Publications (1)

Publication Number Publication Date
WO1995000313A1 true WO1995000313A1 (fr) 1995-01-05

Family

ID=26300044

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001311 WO1995000313A1 (fr) 1991-12-20 1993-06-22 Procede de production d'un film polyolefinique par trempe a l'eau

Country Status (1)

Country Link
WO (1) WO1995000313A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185777A1 (fr) 2012-06-12 2013-12-19 Renescience A/S Procédés de traitement de déchets urbains solides (msw) par hydrolyse enzymatique et fermentation microbienne simultanées
WO2016131791A1 (fr) * 2015-02-20 2016-08-25 Basf Se Films, rubans et monofilaments de polyoléfine photostabilisés
RU2800783C1 (ru) * 2015-02-20 2023-07-28 Басф Се Смесь светостабилизаторов для полиолефиновой пленки, ленты или мононити

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075147A (en) * 1976-10-20 1978-02-21 Standard Oil Company (Indiana) Polypropylene/pelargonate divalent metal salt
WO1982002169A1 (fr) * 1980-12-22 1982-07-08 Kletecka George Anti-oxydants phenoliques a effet retard et stabilisateurs u.v. a base de diazacycloalcane dans des films de polymeres
JPS62152716A (ja) * 1985-12-26 1987-07-07 Idemitsu Petrochem Co Ltd ポリプロピレンシート類の製造方法
US5006587A (en) * 1989-09-25 1991-04-09 Amoco Corporation Polypropylene formulations containing small amounts of fluoborates to improve color and water carry-over
US5049223A (en) * 1990-01-08 1991-09-17 Dowbrands, Inc. Use of surface active agents for improved cooling of thermoplastic film webs
EP0549233A2 (fr) * 1991-12-20 1993-06-30 Scott & Fyfe Limited Méthode pour la fabrication de films de polyoléfine par un procédé de trempage avec de l'eau

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075147A (en) * 1976-10-20 1978-02-21 Standard Oil Company (Indiana) Polypropylene/pelargonate divalent metal salt
WO1982002169A1 (fr) * 1980-12-22 1982-07-08 Kletecka George Anti-oxydants phenoliques a effet retard et stabilisateurs u.v. a base de diazacycloalcane dans des films de polymeres
JPS62152716A (ja) * 1985-12-26 1987-07-07 Idemitsu Petrochem Co Ltd ポリプロピレンシート類の製造方法
US5006587A (en) * 1989-09-25 1991-04-09 Amoco Corporation Polypropylene formulations containing small amounts of fluoborates to improve color and water carry-over
US5049223A (en) * 1990-01-08 1991-09-17 Dowbrands, Inc. Use of surface active agents for improved cooling of thermoplastic film webs
EP0549233A2 (fr) * 1991-12-20 1993-06-30 Scott & Fyfe Limited Méthode pour la fabrication de films de polyoléfine par un procédé de trempage avec de l'eau

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8732, Derwent World Patents Index; AN 87-226509 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185777A1 (fr) 2012-06-12 2013-12-19 Renescience A/S Procédés de traitement de déchets urbains solides (msw) par hydrolyse enzymatique et fermentation microbienne simultanées
WO2013185778A1 (fr) 2012-06-12 2013-12-19 Renescience A/S Procédés et compositions de production de biométhane
WO2016131791A1 (fr) * 2015-02-20 2016-08-25 Basf Se Films, rubans et monofilaments de polyoléfine photostabilisés
RU2691718C2 (ru) * 2015-02-20 2019-06-17 Басф Се Светостабилизированные полиолефиновые пленки, ленты и мононити
US10689495B2 (en) 2015-02-20 2020-06-23 Basf Se Light stabilized polyolefin films, tapes and monofilaments
US11021585B2 (en) 2015-02-20 2021-06-01 Basf Se Light stabilized polyolefin films, tapes and monofilaments
RU2800783C1 (ru) * 2015-02-20 2023-07-28 Басф Се Смесь светостабилизаторов для полиолефиновой пленки, ленты или мононити

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