CH386099A - Process of molding hollow objects in extruded and blown plastic - Google Patents

Process of molding hollow objects in extruded and blown plastic

Info

Publication number
CH386099A
CH386099A CH1511062A CH1511062A CH386099A CH 386099 A CH386099 A CH 386099A CH 1511062 A CH1511062 A CH 1511062A CH 1511062 A CH1511062 A CH 1511062A CH 386099 A CH386099 A CH 386099A
Authority
CH
Switzerland
Prior art keywords
hollow
extruded
compressed air
blowing
interior
Prior art date
Application number
CH1511062A
Other languages
French (fr)
Inventor
Marcus Marcussen Johan August
Original Assignee
Hapos Handelsonderneming N V
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 to BE623248D priority Critical patent/BE623248A/xx
Priority to NL268305D priority patent/NL268305A/xx
Priority to FR916728A priority patent/FR1339479A/en
Application filed by Hapos Handelsonderneming N V filed Critical Hapos Handelsonderneming N V
Priority to CH1511062A priority patent/CH386099A/en
Publication of CH386099A publication Critical patent/CH386099A/en

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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
    • 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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0022—Bright, glossy or shiny surface

Description

  

  
 



  Procédé de moulage d'objets creux en matière plastique
 extrudée et soufflée
 Lorsqu'on fabrique un objet creux en matière plastique selon le procédé d'extrusion-soufflage qui consiste à introduire dans un moule, un objet préalablement extrudé, puis à le dilater par injection d'air comprimé dans ledit objet extrudé, de façon que ses parois soient pressées contre celles du moule et que sa paroi extérieure épouse la forme de la cavité du moule, il n'est pas possible d'obtenir une surface intérieure de l'objet parfaitement lisse, principalement en raison de la grande pression que subissent les parois dudit objet préalablement extrudé.



  Cet   inconvénient    résulte, entre autres raisons, d'un refroidissement trop rapide de la matière à mouler par rapport à sa vitesse de déformation. En effet, au fur et à mesure de l'alimentation en air comprimé, la température qui convenait pour maintenir fluidifiée la surface intérieure se dégrade, ce qui empche d'obtenir une surface très lisse.   I1    n'est pas possible par chauffage du moule, de communiquer à la surface intérieure de l'objet creux préalablement extrudé la température de fluidification voulue, car une telle chaleur devrait atteindre la face intérieure dudit objet à travers l'épaisseur de sa paroi, ce qui provoquerait une fusion totale et une trop grande fluidité qui nuirait à la forme définitive dudit objet.



   L'invention a pour but de remédier à cet inconvénient, et a pour objet un procédé de moulage d'objets creux en matière plastique extrudée et soufflée, caractérisé en ce que l'air comprimé nécessaire au soufflage d'une ébauche dudit objet est préalablement chauffé, de manière à provoquer la fusion superficielle de l'intérieur dudit objet creux afin que la surface en soit lisse.



   Une mise en oeuvre préférée du procédé est caractérisée en ce que l'air comprimé nécessaire au soufflage de l'ébauche de l'objet creux préalablement extrudée provient d'une installation d'air sous pression comprenant des moyens de chauffage de l'air commandés par des thermostats.



   L'invention comprend aussi l'objet creux en matière plastique obtenu par le procédé ci-dessus.
 



   REVENDICATION I
 Procédé de moulage d'objets creux en matière plastique extrudée et soufflée, caractérisé en ce que l'air comprimé nécessaire au soufflage d'une ébauche dudit objet est préalablement chauffé de manière à provoquer la fusion superficielle de l'intérieur dudit objet creux afin que la surface en soit lisse.



      SOUS-REVENDICATION   
 Procédé selon la revendication I, caractérisé en ce que l'air comprimé nécessaire au soufflage de l'ébauche de l'objet creux préalablement extrudée provient d'une installation d'air sous pression comprenant les moyens de chauffage de l'air commandés par des thermostats.



   REVENDICATION   II   
 Objet creux en matière plastique obtenu par le procédé selon la revendication I. 

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



   



  
 



  Method of molding hollow plastic objects
 extruded and blown
 When manufacturing a hollow plastic object according to the extrusion-blow molding process which consists of introducing into a mold, a previously extruded object, then expanding it by injecting compressed air into said extruded object, so that its walls are pressed against those of the mold and its outer wall conforms to the shape of the mold cavity, it is not possible to obtain a perfectly smooth inner surface of the object, mainly due to the great pressure to which the molds are subjected. walls of said previously extruded object.



  This drawback results, among other reasons, from too rapid cooling of the material to be molded relative to its rate of deformation. In fact, as the compressed air is supplied, the temperature which is suitable for keeping the interior surface fluidized deteriorates, which prevents a very smooth surface from being obtained. It is not possible by heating the mold to communicate to the interior surface of the hollow object previously extruded the desired fluidization temperature, because such heat should reach the interior face of said object through the thickness of its wall, which would cause a total fusion and too much fluidity which would harm the final shape of said object.



   The object of the invention is to remedy this drawback, and its object is a method of molding hollow objects in extruded and blown plastic material, characterized in that the compressed air necessary for blowing a blank of said object is previously heated, so as to cause the surface fusion of the interior of said hollow object so that the surface thereof is smooth.



   A preferred implementation of the method is characterized in that the compressed air necessary for blowing the preform of the hollow object previously extruded comes from a pressurized air installation comprising means for heating the controlled air. by thermostats.



   The invention also comprises the hollow plastic object obtained by the above process.
 



   CLAIM I
 A method of molding hollow objects in extruded and blown plastic material, characterized in that the compressed air necessary for blowing a blank of said object is heated beforehand so as to cause the surface melting of the interior of said hollow object so that the surface is smooth.



      SUB-CLAIM
 Process according to Claim I, characterized in that the compressed air necessary for blowing the blank of the hollow object previously extruded comes from a pressurized air installation comprising the means for heating the air controlled by thermostats.



   CLAIM II
 Hollow plastic object obtained by the process according to claim I.

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

Claims (1)

**ATTENTION** debut du champ CLMS peut contenir fin de DESC **. ** ATTENTION ** start of field CLMS can contain end of DESC **. Procédé de moulage d'objets creux en matière plastique extrudée et soufflée Lorsqu'on fabrique un objet creux en matière plastique selon le procédé d'extrusion-soufflage qui consiste à introduire dans un moule, un objet préalablement extrudé, puis à le dilater par injection d'air comprimé dans ledit objet extrudé, de façon que ses parois soient pressées contre celles du moule et que sa paroi extérieure épouse la forme de la cavité du moule, il n'est pas possible d'obtenir une surface intérieure de l'objet parfaitement lisse, principalement en raison de la grande pression que subissent les parois dudit objet préalablement extrudé. Method of molding hollow plastic objects extruded and blown When manufacturing a hollow plastic object according to the extrusion-blow molding process which consists of introducing into a mold, a previously extruded object, then expanding it by injecting compressed air into said extruded object, so that its walls are pressed against those of the mold and its outer wall conforms to the shape of the mold cavity, it is not possible to obtain a perfectly smooth inner surface of the object, mainly due to the great pressure to which the molds are subjected. walls of said previously extruded object. Cet inconvénient résulte, entre autres raisons, d'un refroidissement trop rapide de la matière à mouler par rapport à sa vitesse de déformation. En effet, au fur et à mesure de l'alimentation en air comprimé, la température qui convenait pour maintenir fluidifiée la surface intérieure se dégrade, ce qui empche d'obtenir une surface très lisse. I1 n'est pas possible par chauffage du moule, de communiquer à la surface intérieure de l'objet creux préalablement extrudé la température de fluidification voulue, car une telle chaleur devrait atteindre la face intérieure dudit objet à travers l'épaisseur de sa paroi, ce qui provoquerait une fusion totale et une trop grande fluidité qui nuirait à la forme définitive dudit objet. This drawback results, among other reasons, from too rapid cooling of the material to be molded relative to its rate of deformation. In fact, as the compressed air is supplied, the temperature which is suitable for keeping the interior surface fluidized deteriorates, which prevents a very smooth surface from being obtained. It is not possible by heating the mold to communicate to the interior surface of the hollow object previously extruded the desired fluidization temperature, because such heat should reach the interior face of said object through the thickness of its wall, which would cause a total fusion and too much fluidity which would harm the final shape of said object. L'invention a pour but de remédier à cet inconvénient, et a pour objet un procédé de moulage d'objets creux en matière plastique extrudée et soufflée, caractérisé en ce que l'air comprimé nécessaire au soufflage d'une ébauche dudit objet est préalablement chauffé, de manière à provoquer la fusion superficielle de l'intérieur dudit objet creux afin que la surface en soit lisse. The object of the invention is to remedy this drawback, and its object is a method of molding hollow objects in extruded and blown plastic material, characterized in that the compressed air necessary for blowing a blank of said object is previously heated, so as to cause the surface fusion of the interior of said hollow object so that the surface thereof is smooth. Une mise en oeuvre préférée du procédé est caractérisée en ce que l'air comprimé nécessaire au soufflage de l'ébauche de l'objet creux préalablement extrudée provient d'une installation d'air sous pression comprenant des moyens de chauffage de l'air commandés par des thermostats. A preferred implementation of the method is characterized in that the compressed air necessary for blowing the preform of the hollow object previously extruded comes from a pressurized air installation comprising means for heating the controlled air. by thermostats. L'invention comprend aussi l'objet creux en matière plastique obtenu par le procédé ci-dessus. The invention also comprises the hollow plastic object obtained by the above process. REVENDICATION I Procédé de moulage d'objets creux en matière plastique extrudée et soufflée, caractérisé en ce que l'air comprimé nécessaire au soufflage d'une ébauche dudit objet est préalablement chauffé de manière à provoquer la fusion superficielle de l'intérieur dudit objet creux afin que la surface en soit lisse. CLAIM I A method of molding hollow objects in extruded and blown plastic material, characterized in that the compressed air necessary for blowing a blank of said object is heated beforehand so as to cause the surface melting of the interior of said hollow object so that the surface is smooth. SOUS-REVENDICATION Procédé selon la revendication I, caractérisé en ce que l'air comprimé nécessaire au soufflage de l'ébauche de l'objet creux préalablement extrudée provient d'une installation d'air sous pression comprenant les moyens de chauffage de l'air commandés par des thermostats. SUB-CLAIM Process according to Claim I, characterized in that the compressed air necessary for blowing the blank of the hollow object previously extruded comes from a pressurized air installation comprising the means for heating the air controlled by thermostats. REVENDICATION II Objet creux en matière plastique obtenu par le procédé selon la revendication I. CLAIM II Hollow plastic object obtained by the process according to claim I.
CH1511062A 1962-12-26 1962-12-26 Process of molding hollow objects in extruded and blown plastic CH386099A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE623248D BE623248A (en) 1962-12-26
NL268305D NL268305A (en) 1962-12-26
FR916728A FR1339479A (en) 1962-12-26 1962-11-27 Improvement in the molding of hollow objects by blow molding
CH1511062A CH386099A (en) 1962-12-26 1962-12-26 Process of molding hollow objects in extruded and blown plastic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1511062A CH386099A (en) 1962-12-26 1962-12-26 Process of molding hollow objects in extruded and blown plastic

Publications (1)

Publication Number Publication Date
CH386099A true CH386099A (en) 1964-12-31

Family

ID=4406435

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1511062A CH386099A (en) 1962-12-26 1962-12-26 Process of molding hollow objects in extruded and blown plastic

Country Status (4)

Country Link
BE (1) BE623248A (en)
CH (1) CH386099A (en)
FR (1) FR1339479A (en)
NL (1) NL268305A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2706055A1 (en) * 1976-02-20 1977-08-25 Owens Illinois Inc METHOD AND DEVICE FOR BLOW MOLDING PLASTIC OBJECTS
GB2072091B (en) * 1979-10-09 1984-08-15 Yoshino Kogyosho Co Ltd Bottle-shaped container of orientation-moulded polypropylene resin and method of moulding the same

Also Published As

Publication number Publication date
BE623248A (en) 1900-01-01
NL268305A (en) 1900-01-01
FR1339479A (en) 1963-10-04

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