BE571466A - - Google Patents

Info

Publication number
BE571466A
BE571466A BE571466DA BE571466A BE 571466 A BE571466 A BE 571466A BE 571466D A BE571466D A BE 571466DA BE 571466 A BE571466 A BE 571466A
Authority
BE
Belgium
Prior art keywords
blowing
ethyl alcohol
vapors
water vapor
air
Prior art date
Application number
Other languages
French (fr)
Publication of BE571466A publication Critical patent/BE571466A/fr

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0005Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/46Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/66Cooling by refrigerant introduced into the blown article
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16Cooling
    • B29C2035/1691Cooling using gas-liquid mixtures

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

       

  



   Procédé pour la production de corps creux transparents comme   le   verre, à parois minces, et, le cas échéant, de feuilles, par extrusion-soufflage de matières thermoplastiques cristallisables, autres que le polyéthylène, en parti- culier de polyamides, caractérisé en ce qu'on insuffle dans ces matières thermo- plastiques, au cours de leur transformation en corps creux, un mélange d'air - ou d'un autre gaz - avec une vapeur se condensant rapidement. 

**ATTENTION** fin du champ DESC peut contenir debut de CLMS **.



  



   Process for the production of transparent hollow bodies like glass, with thin walls, and, where appropriate, of sheets, by extrusion blow molding of crystallizable thermoplastics, other than polyethylene, in particular of polyamides, characterized in that During their transformation into hollow bodies, these thermoplastics are blown with a mixture of air - or of another gas - with a rapidly condensing vapor.

** ATTENTION ** end of DESC field can contain start of CLMS **.


    

Claims (1)

<Desc/Clms Page number 1> <Desc / Clms Page number 1> On sait que, par insufflation de vapeur d'eau ou de vapeurs organiques, on peut éviter la conglutination de tubes en polyéthylène, à parois très minces, obtenus par soufflage de la matière plastique tenace, extrudée au travers d'une filière circulaire (Brevet allemand N 858 771 du 25 avril 1951). We know that, by blowing in water vapor or organic vapors, it is possible to avoid the conglutination of polyethylene tubes, with very thin walls, obtained by blowing the tough plastic material, extruded through a circular die (Patent German N 858 771 of April 25, 1951). On a trouvé que ce mode de travail peut, avec de bons résultats, éga- lement être appliqué à d'autres substances hautement polymérisées cristallisables qui, à l'encontre du polyéthylène, n'ont pas tendance à conglutiner. On obtient alors un autre effet surprenant. Lorsque ces matières plastiques sont transfor- mées en corps creux à parois minces par extrusion-soufflage, le processus de cris- tallisation se trouve sans doute influencé par la vapeur d'eau ou les vapeurs or- ganiques insufflées, et il se forme alors des objets particulièrement clairs et transparents qui, sans cela, seraient opaques ou ternes. It has been found that this method of working can, with good results, also be applied to other crystallizable highly polymerized substances which, unlike polyethylene, do not tend to conglutinate. Another surprising effect is then obtained. When these plastics are transformed into thin-walled hollow bodies by blow-molding, the crystallization process is undoubtedly influenced by the water vapor or the organic vapors blown in, and there are then formed particularly clear and transparent objects which would otherwise be opaque or dull. Pour la mise en oeuvre de ce procédé, on opère avantageusement comme suit : l'air utilisé pour le souf- flage d'un tube obtenu par extrusion dans une boudineuse, au travers d'une filiè- re circulaire, d'un polyamide visqueux, chauffé à haute température, par exemple de polycarprolactame dont la masse fondue est d'une viscosité élevée, peut être additionné d'une fàible quantité de vapeur d'alcool éthylique ; cet effet,.on peut, par exemple, faire passer l'air par une bouteille remplie d'alcool éthyli- que aqueux. En coupant les tubes ainsi soufflés dans le sens de la longueur, on obtient des feuilles transparentes comme le verre, extrêmement brillantes, d'une épaisseur de quelques seulement. For the implementation of this process, the operation is advantageously as follows: the air used for blowing a tube obtained by extrusion in an extrusion machine, through a circular die, of a viscous polyamide , heated to high temperature, for example polycarprolactam, the melt of which is of high viscosity, may be added with a small amount of ethyl alcohol vapor; For this purpose, for example, the air can be passed through a bottle filled with aqueous ethyl alcohol. By cutting the tubes thus blown in the direction of the length, one obtains transparent sheets like glass, extremely shiny, with a thickness of only a few. A la place d'alcool éthylique, on peut aussi ajouter à l'air de soufflage des vapeurs qui se condensent rapidement, par exemple de la vapeur d'eau ou des vapeurs de substances organiques autres que l'alcool éthylique. Instead of ethyl alcohol, vapors which condense quickly, for example water vapor or vapors of organic substances other than ethyl alcohol, can also be added to the blowing air. REVENDICATION. **ATTENTION** fin du champ CLMS peut contenir debut de DESC **. CLAIM. ** CAUTION ** end of field CLMS may contain start of DESC **.
BE571466D BE571466A (en)

Publications (1)

Publication Number Publication Date
BE571466A true BE571466A (en)

Family

ID=189644

Family Applications (1)

Application Number Title Priority Date Filing Date
BE571466D BE571466A (en)

Country Status (1)

Country Link
BE (1) BE571466A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0159310A2 (en) * 1984-04-20 1985-10-23 HOOVER UNIVERSAL, INC (a Michigan corporation) Hollow copolyamide article

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0159310A2 (en) * 1984-04-20 1985-10-23 HOOVER UNIVERSAL, INC (a Michigan corporation) Hollow copolyamide article
EP0159310A3 (en) * 1984-04-20 1987-12-23 Monsanto Company Hollow copolyamide article

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