DEP0051390DA - Process for the aftertreatment of stretched polyamide films - Google Patents
Process for the aftertreatment of stretched polyamide filmsInfo
- Publication number
- DEP0051390DA DEP0051390DA DEP0051390DA DE P0051390D A DEP0051390D A DE P0051390DA DE P0051390D A DEP0051390D A DE P0051390DA
- Authority
- DE
- Germany
- Prior art keywords
- aftertreatment
- stretched polyamide
- films
- polyamide films
- stretched
- 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.)
- Expired
Links
- 239000004952 Polyamide Substances 0.000 title claims description 6
- 229920002647 polyamide Polymers 0.000 title claims description 6
- 238000000034 method Methods 0.000 title claims description 4
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000002045 lasting effect Effects 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Description
Es ist bekannt, Polyamidfolien in Form von Fäden, Folien o.dgl. durch Kalststreckung in längsgerichtete Erzeugnisse, bei denen die Molekülgruppen oder -ketten in einer einzigen Richtung oder eben angeordnet sind, umzuwandeln, um deren Zugfestigkeit, Biegsamkeit und Elastizität zu erhöhen. Derart behandelte Folien besitzen jedoch die nachteilige Eigenschaft, dass ihre Thermoplastizitätsgrenze durch Feuchtigkeitseinwirkung insbesondere bei plötzlicher Wärmezufuhr sehr sehr stark absinkt, sodass beispielsweise beim Umbügeln einer aus mit Polyamidfolie isolierten Leitern bestehend Spule das Folienmaterial wegschrumpfen und so eine Zerstörung der Isolation eintreten kann.It is known that polyamide films in the form of threads, films or the like. by cold stretching into longitudinal products, in which the molecular groups or chains are arranged in a single direction or flat, in order to increase their tensile strength, flexibility and elasticity. Films treated in this way, however, have the disadvantageous property that their thermoplasticity limit drops very sharply due to the action of moisture, especially when there is a sudden supply of heat, so that, for example, when ironing a coil consisting of polyamide film-insulated conductors, the film material can shrink away and the insulation can thus be destroyed.
Es ist Aufgabe der Erfindung, die mechanische Festigkeit längsgereckter Polyamidfolien bei höheren Temperaturen zu verbessern und damit die genannten Nachteile zu beseitigen. Erfindungsgemäss werden die Folien nach dem Recken getempert. Zu diesem Zweck werden die Folien beispielsweise etwa 24 Stunden lang einer Temperatur von etwa 100°C ausgesetzt.The object of the invention is to improve the mechanical strength of longitudinally stretched polyamide films at higher temperatures and thus to eliminate the disadvantages mentioned. According to the invention, the films are tempered after stretching. For this purpose, the foils are exposed to a temperature of about 100 ° C. for about 24 hours, for example.
Die Erfindung beruht auf der Erkenntnis, dass die Feuchtigkeit der umgebenden Luft bei gewissen Kunststoffen als Weichmacher wirkt. Je grösser der Weichmacheranteil bei plastischen Kunststoffen ist, umso niedriger ist deren Erweichungspunkt und umso geringer ist damit deren Reissfestigkeit bei höheren Temperaturen. Da bei gereckten Folien die Bereitschaft zur Aufnahme von Feuchtigkeit grösser wird als bei nicht gereckten Folien, ist auch ihre mechanische Festigkeit bei höheren Temperaturen geringer.The invention is based on the knowledge that the moisture in the surrounding air acts as a plasticizer in certain plastics. The larger the proportion of plasticizer in plastic plastics, the lower their softening point and the lower their tensile strength at higher temperatures. Since the willingness to absorb moisture is greater with stretched films than with non-stretched films, their mechanical strength is also lower at higher temperatures.
Das Verfahren findet beispielsweise Anwendung bei der Herstellung von aus mit Polyamidfolie isolierten Leitern bestehenden elektrischen Spulen, bei denen die fertiggewickelte Spule umbügelt wird. Es ist nicht notwendig, dass die Folie vor dem Aufbringen auf den Leiter getempert wird, sondern es kann auch der isolierte Leiter oder auch die fertige Spule vor dem Umbügeln dem Temperungsprozess unterworfen werden.The method is used, for example, in the production of electrical coils consisting of conductors insulated with polyamide film, in which the fully wound coil is ironed around. It is not necessary for the film to be tempered before it is applied to the conductor, rather the insulated conductor or the finished coil can also be subjected to the tempering process before being ironed on.
Claims (1)
Family
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