EP1606095A2 - Procede et filiere d'extrusion pour eliminer des marques de coulee de surface lors de l'extrusion de polymeres thermoplastiques - Google Patents

Procede et filiere d'extrusion pour eliminer des marques de coulee de surface lors de l'extrusion de polymeres thermoplastiques

Info

Publication number
EP1606095A2
EP1606095A2 EP04713535A EP04713535A EP1606095A2 EP 1606095 A2 EP1606095 A2 EP 1606095A2 EP 04713535 A EP04713535 A EP 04713535A EP 04713535 A EP04713535 A EP 04713535A EP 1606095 A2 EP1606095 A2 EP 1606095A2
Authority
EP
European Patent Office
Prior art keywords
die
polymer
extrusion
elastomers
opposing surfaces
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.)
Withdrawn
Application number
EP04713535A
Other languages
German (de)
English (en)
Inventor
Koulikov (Kulikov), Oleg
Klaus Hornung
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1606095A2 publication Critical patent/EP1606095A2/fr
Withdrawn legal-status Critical Current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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/3001—Extrusion nozzles or dies characterised by the material or their manufacturing process
    • B29C48/3003—Materials, coating or lining therefor
    • 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
    • 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
    • B29C48/03—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
    • B29C48/06—Rod-shaped

Definitions

  • IPC 7 B29C 33/56, B28C 47/00, B29C 47/12, B29C 49/00
  • the present invention generally relates to the processing of thermoplastic polymers by extrusion. More particularly the present invention relates to the manufacture of blown films, tubes, and wire coatings having a good surface appearance. In a more specific aspect, the invention relates to a process of thermoplastic polymers (e.g. polyolefins), which have a narrow molecular weight distribution. The invention further relates to a die design which provides a high rate of defect free extrusion of the molten plastics.
  • additives for use as processing aids to obtain melt fracture reduction in extrudates [10,11] are expensive and the added cost, depending on the required concentration, may be prohibitive in resins, such as granular LLDPE, intended for commodity applications. Also additives influence the rheological properties of the base resin. In excess amounts they may adversely affect critical film properties including gloss, transparency, blocking and heat sealability characteristics of the product.
  • Coating the die land area with substances which reduce or enhance the adhesion of the polymer material to the die land surfaces [18,19] eliminate surface melt fracturing at higher extrusion rates.
  • substances which reduce or enhance the adhesion of the polymer material to the die land surfaces For example the use of brass or a composition containing about 80% to 99% nickel and about 1% to 20% phosphorous give better results as compared to common stainless steel.
  • the use of thin coatings from fluorinated polymers as well as the use of PTFE for the die land area makes it possible to enlarge the rate of defect free extrusion up to 3.5 times.
  • the invention also resides in an apparatus for processing of thermoplastic polymers including a bin feeder, heaters, press extruder, and a die, preferably an annular die, said die having a die land region defining opposing surfaces, the improvement wherein at least one of said opposing surfaces in area adjacent to the die orifice is coated with an elastic material.
  • both opposing surfaces in area adjacent to the die orifice are coated with an elastic material comprising elastomers selected from the group consisting of: Hydrogenated Nitrile Rubber, Fluorinated Hydrocarbon Elastomers, Perfluorinated Elastomers, Silicone Elastomers, and Fluorosilicone Elastomers.
  • elastomers selected from the group consisting of: Hydrogenated Nitrile Rubber, Fluorinated Hydrocarbon Elastomers, Perfluorinated Elastomers, Silicone Elastomers, and Fluorosilicone Elastomers.
  • Silicon Rubber which is designed to work at elevated temperatures includes a filler, a heat resistance improver, etc. .
  • the heat resistance improver may include, e.g., carbon black, graphite, fluorinated carbon, and iron oxide.
  • the filler is mostly a silica-based inorganic filler, e.g. silica fume, but in accordance with our invention the rubber composition could include micro-powder of a low surface energy filler selected from the group of fluorinated polymers, Boron Nitrate having hexagonal crystal form, graphite, molybdenum disulfide, tungsten disulfide, talc in total amount of about 0,1 to about 80 wt. %.
  • the rubber coatings were produced by potting a one component silicone rubber "Ceresit” from Henkel KGaA (maximum working temperature is 315°C) [30] or by potting a two component silicone rubber "RTN-ME 622A” from Wacker-Chemie GmbH [31]. The coatings were vulcanized by heating at 150°C.
  • the rubber rings for the die design in Fig. IC were cut from silicon rubber or fluorinated rubber (Viton) tubes with 6 mm inner diameter. The rings were glued inside the metal frame and closed from the entrance side by diaphragms of 5 mm diameter.
  • the extrusion rate was gradually increased from 0.1 to 250 mm per sec.
  • the flow curve for the case of a tubular brass die of the conventional design (Fig. 1A, length - 24 mm, diameter - 6 mm, temperature of extrusion - 145°C) is presented in Fig. 4 by a continuous line.
  • Fig. 1A length - 24 mm, diameter - 6 mm, temperature of extrusion - 145°C
  • the experiments were performed with LLDPE, and the results therefore may contribute to an improvement of extrusion of thermoplastic polymers, which have a narrow molecular weight distribution. Especially the results may have an impact on the improvement of polymer processing in tubular film blowing , injection molding, fiber spinning, as well as on measurements of viscosity values in rheometers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé et un appareil pour éliminer sensiblement des marques de coulée de surface lors de l'extrusion d'un polymère thermoplastique, tel qu'un polyéthylène fondu, linéaire, à faible densité, au moyen d'une filière présentant un revêtement élastique sur sa surface interne adjacente à la sortie de filière.
EP04713535A 2003-02-28 2004-02-23 Procede et filiere d'extrusion pour eliminer des marques de coulee de surface lors de l'extrusion de polymeres thermoplastiques Withdrawn EP1606095A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10308909A DE10308909A1 (de) 2003-02-28 2003-02-28 Verfahren und Extrusionsdüse zur Beseitigung von Oberflächenschmelzbrüchen bei der Extrusion von thermoplastischen Polymeren
DE10308909 2003-02-28
PCT/EP2004/001772 WO2004076151A2 (fr) 2003-02-28 2004-02-23 Procede et filiere d'extrusion pour eliminer des marques de coulee de surface lors de l'extrusion de polymeres thermoplastiques

Publications (1)

Publication Number Publication Date
EP1606095A2 true EP1606095A2 (fr) 2005-12-21

Family

ID=32842053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04713535A Withdrawn EP1606095A2 (fr) 2003-02-28 2004-02-23 Procede et filiere d'extrusion pour eliminer des marques de coulee de surface lors de l'extrusion de polymeres thermoplastiques

Country Status (3)

Country Link
EP (1) EP1606095A2 (fr)
DE (1) DE10308909A1 (fr)
WO (1) WO2004076151A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2272709C2 (ru) * 2004-01-21 2006-03-27 Олег Леонидович Куликов Способ формования термопластичного полимерного материала, устройство для его осуществления и состав термопластичного полимерного материала
WO2011082294A1 (fr) 2009-12-30 2011-07-07 Dow Global Technologies Llc Procédé d'extrusion d'un polymère
WO2012088692A1 (fr) 2010-12-30 2012-07-05 Dow Global Technologies Llc Logement de matrice doté d'une partie de filière à section constante refroidie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403476A (en) * 1944-08-08 1946-07-09 Du Pont Extrusion apparatus
US4615858A (en) * 1985-05-16 1986-10-07 Mobil Oil Corporation Method and apparatus producing decorative melt fracture patterns on polymeric products

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004076151A2 *

Also Published As

Publication number Publication date
DE10308909A1 (de) 2004-09-09
WO2004076151A3 (fr) 2005-01-27
WO2004076151A2 (fr) 2004-09-10

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