Frost line (polymers)

Frost line (polymers)

The frost line is a term used in plastic film manufacturing by extrusion. It refers to the point beyond the die where the temperature of the molten plastic falls below the softening point and the diameter of the extruded plastic bubble stabilizes. The term was borrowed from the notion of "frost line" in soil science and refers to the frosted appearance of the plastic film above the "frost line".

The distance from the die is called the height of the frost line. It depends on various factors, including the melt temperature, the speed of cooling, the extrusion speed, and the diameter of the bubble. The notion is important, since the higher the frost line, the more difficult to control the uniformity of the film thickness.

For example, a higher frost line due to higher melt temperature and/or lower cooling rate means a longer time to solidify, and a more smooth and transparent film is produced.


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Frost line (disambiguation) — In geology, the frost line is the level down to which the soil will normally freeze each winter. By an analogy, the term is introduced in other areas.*Frost line (astrophysics), a particular distance in the solar nebula from the central protosun… …   Wikipedia

  • pipeline — /puyp luyn /, n., v., pipelined, pipelining. n. 1. a long tubular conduit or series of pipes, often underground, with pumps and valves for flow control, used to transport crude oil, natural gas, water, etc., esp. over great distances. 2. a route …   Universalium

  • Life Sciences — ▪ 2009 Introduction Zoology       In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …   Universalium

  • Nobel Prizes — ▪ 2009 Introduction Prize for Peace       The 2008 Nobel Prize for Peace was awarded to Martti Ahtisaari, former president (1994–2000) of Finland, for his work over more than 30 years in settling international disputes, many involving ethnic,… …   Universalium

  • Organic light-emitting diode — Demonstration of a flexible OLED device A green emitting OLED device An …   Wikipedia

  • comet — cometary /kom i ter ee/, cometic /keuh met ik/, cometical, adj. cometlike, adj. /kom it/, n. Astron. a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and… …   Universalium

  • Suture — The word suture has several uses in medicine, including: {{}}Cranial suture A type of joint between the bones of the skull where the bones are held tightly together by fibrous tissue. A surgical suture Thread like material used to sew tissue… …   Medical dictionary

  • Liste Des Sigles De L'AAR Débutant Par N — Voir l article principal: Sigle de l AAR N NABU Ecst Container Services and Trading, GMBH NACR Nashville and Ashland City Railroad NACX GE Rail Services NADU North American Domestic Container Corporation NADX GE Rail Services NADZ North American… …   Wikipédia en Français

  • Liste des sigles de l'AAR debutant par N — Liste des sigles de l AAR débutant par N Voir l article principal: Sigle de l AAR N NABU Ecst Container Services and Trading, GMBH NACR Nashville and Ashland City Railroad NACX GE Rail Services NADU North American Domestic Container Corporation… …   Wikipédia en Français

  • Liste des sigles de l'AAR débutant par N — Voir l article principal: Sigle de l AAR N NABU Ecst Container Services and Trading, GMBH NACR Nashville and Ashland City Railroad NACX GE Rail Services NADU North American Domestic Container Corporation NADX GE Rail Services NADZ North American… …   Wikipédia en Français

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”