Extruder-blown film

Union Carbide Corp produced the first of the synthetic papers in the late 1960s. Since that time other examples of synthetic papers include DuPont s Tyvek nonwoven paper and Van Leer s Valeron cross-laminated film. This market is now dominated by a few large, worldwide ventures with proprietary processing techniques that extend the use of single and multilayer extruded blown film or cast film. 

Strengths of films made from a starch-poly(vinyl alcohol) blend containing glycerol and poly(ethylene-co-acrylic acid) have been examined.166 High-amylose starches produced films with the most consistent properties. In a process for extruded blown film, blending of high-amylose starch with starches with more typical amylose contents and plasticizers or gelatinization aids improved properties.167 Extruded... 

Figure 5.19 Example of upward extruded blown film process for biaxially orienting film...

Calender Extruder flatdie Extruder Blown film Extruder Hex-lip... 

Bu Informal abbreviation for bytyl. bubble 1. A void, or globule of gas or air, trapped in a plastic product, usually as a result of faulty processing. See air entrapment. 2. In extruded blown (tubular) film production, the tube extending from the die to the nip roll. See extruded blown film. 

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