DE1072802B - Process for the production of polyethylene films by the blown process - Google Patents

Process for the production of polyethylene films by the blown process

Info

Publication number
DE1072802B
DE1072802B DENDAT1072802D DE1072802DA DE1072802B DE 1072802 B DE1072802 B DE 1072802B DE NDAT1072802 D DENDAT1072802 D DE NDAT1072802D DE 1072802D A DE1072802D A DE 1072802DA DE 1072802 B DE1072802 B DE 1072802B
Authority
DE
Germany
Prior art keywords
polyethylene
production
molecular weight
blown
polyethylene films
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.)
Pending
Application number
DENDAT1072802D
Other languages
German (de)
Original Assignee
Dynamit-Actien-Gesellschaft vormals Alfred iNobieli & Co., Troisdorf (Bez. Köln)
Publication date
Publication of DE1072802B publication Critical patent/DE1072802B/en
Pending 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
    • B29C48/03—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
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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

Description

Verfahren zur Herstellung von Polyäthylenfolien nach dem Blasverfahren Bekanntlich läßt sich Polyäthylen zu Folien verblasen, wobei man so verfährt, daß ein aus einer Schnecke austretender, noch warmer Schlauch mit Luft zu einem dünnen, weiten Schlauch ausgeblasen wird.Process for the production of polyethylene films by the blown process It is known that polyethylene can be blown into foils, the procedure being that a still warm hose emerging from a snail with air into a thin, wide hose is blown out.

Es wurde nun gefunden, daß das Blasen derartiger Folien außerordentlich erleichtert wird, wenn man das normale, mit hohem Druck polymerisierte Äthylen mit einem Molekulargewicht bis 20000 mit einem Polyäthylen, das nach dem drucklosen Verfahren hergestellt wurde und ein wesentlich höheres Molekulargewicht, wie 50000 und höher hat, vermischt, dann durch eine beheizte Schnecke gibt und den entstandenen Schlauch, wie vorstehend angegeben, aufbläst. It has now been found that the blowing of such films is extraordinary It is made easier if you use the normal ethylene polymerized at high pressure a molecular weight up to 20,000 with a polyethylene, which after the pressureless Process was made and a much higher molecular weight, such as 50,000 and higher, mixed, then through a heated screw there and the resulting Inflates tube as indicated above.

Dieses Ergebnis ist um so überraschender, als sich das hochmolekulare Polyäthylen allein nur schlecht verblasen läßt und besonders undurchsichtige, wenig geschmeidige Folien ergibt. This result is all the more surprising as the high molecular weight Polyethylene alone is difficult to blow and especially opaque, little results in pliable films.

Durch Anderung des Mischungsverhältnisses zwischen hochmolekularem und niedermolekularem Polyäthylen läßt sich die Weichheit der Folie in weiten Grenzen abstimmen. By changing the mixing ratio between high molecular weight and low molecular weight polyethylene, the softness of the film can be varied within wide limits vote.

Fernerhin ist bekannt, daß eine Mischung aus Hochdruckpolyäthylenen verschiedener Molekulargewichte bei der Verarbeitung zu Folien führt, die neben Streifen und Schlieren auch ungleichmäßige Wanddicken besitzen. Es war also nicht vorauszusehen, daß Mischungen aus Niederdruckpolyäthylen mit Molekulargewichten über 50 000 und Hochdruckpolyäthylen mit Molekulargewichten bis zu 20 000 derartige durchsichtige und homogene Folien ergeben würden. It is also known that a mixture of high pressure polyethylenes different molecular weights in the processing leads to films that besides Stripes and streaks also have uneven wall thicknesses. So it wasn't anticipate that mixtures of low-pressure polyethylene with molecular weights over 50,000 and high pressure polyethylene with molecular weights up to 20,000 such transparent and homogeneous films would result.

Beispiel Man mischt 70 Teile Hochdruckpolyäthylen vom Molekulargewicht 20000 mit 30 Teilen drucklos hergestelltem Polyäthylen vom Molekulargewicht 50 000, preßt die Mischung durch eine auf 1800 C erhitzte Schnecke und bläst den austretenden Schlauch in bekannter Weise aus. Example 70 parts of high pressure polyethylene of molecular weight are mixed 20,000 with 30 parts of unpressurized polyethylene with a molecular weight of 50,000, presses the mixture through a screw heated to 1800 C and blows the emerging Hose in a known manner.

Die so erhaltene Folie hat folgende Eigenschaften: Dicke | Zugfestigkeit | Eipreißfestigkeit in 1/100 mm kg/cm2 kg/mm längs I quer längs zuquer 2,4 bis 2,6 | 240 | 200 | 18,5 19,7 Gegenüber einer Folie aus reinem Hochdruckpolyäthylen zeigt die Folie vor allen Dingen eine erhöhte Einreißfestigkeit.The film obtained in this way has the following properties: Thickness | Tensile strength | Egg tear resistance in 1/100 mm kg / cm2 kg / mm lengthways I crossways lengthways crossways 2.4 to 2.6 | 240 | 200 | 18.5 19.7 Compared to a film made of pure high-pressure polyethylene, the film shows above all an increased tear resistance.

Claims (1)

PATENTANSPRUCH Verfahren zur Herstellung von Polyäthylenfolien nach dem Blasverfahren, dadurch gekennzeichnet, daß man Mischungen aus Hochdruckpolyäthylen mit einem Molekulargewicht bis 20000 und Niederdruckpolyäthylen mit einem Molekulargewicht von 50 000 und höher verwendet. PATENT CLAIM Process for the production of polyethylene films according to the blow molding process, characterized in that mixtures of high-pressure polyethylene with a molecular weight of up to 20,000 and low-density polyethylene with a molecular weight used by 50,000 and above. In Betracht gezogene Druckschriften: Schildknecht: »Vinyl and Related Polymess«, N.Y., 1952,S.521 bis 523; »Kunststoffe«, 43 (1953), S. 134 bis 137. Publications considered: Schildknecht: »Vinyl and Related Polymess ", N.Y., 1952, pp.521-523; "Kunststoffe", 43 (1953), pp. 134 to 137.
DENDAT1072802D Process for the production of polyethylene films by the blown process Pending DE1072802B (en)

Publications (1)

Publication Number Publication Date
DE1072802B true DE1072802B (en) 1960-01-07

Family

ID=597193

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT1072802D Pending DE1072802B (en) Process for the production of polyethylene films by the blown process

Country Status (1)

Country Link
DE (1) DE1072802B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939055A1 (en) * 1979-05-18 1980-11-27 Asahi Chemical Ind POLYAETHYLENE MIXTURE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939055A1 (en) * 1979-05-18 1980-11-27 Asahi Chemical Ind POLYAETHYLENE MIXTURE
DE2939055C2 (en) * 1979-05-18 1982-12-23 Asahi Kasei Kogyo K.K., Osaka POLYAETHYLENE MIXTURE
DE2939055C3 (en) * 1979-05-18 1986-05-28 Asahi Kasei Kogyo K.K., Osaka POLYAETHYLENE MIXTURE

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