PT ZONE: Film Extrusion

EXTRUSION: Feedblock Tuning Inserts Keep Lines Running
Get finer tuning of coex film/sheet layer thickness without downtime. More (+)
‘Sandy’ Storm Victim Recovers Quickly
Quick service by an equipment supplier helped get a waterlogged plant back up and running. More (+)


MOST RECENT CONTENT: Film Extrusion

EXTRUSION: Process Solid, Foam Film With Same Tooling

New system enhances flexibility of a single line.

Granulate or Shred: Which Makes Sense for You?

That is the size-reduction question confronting many processors today. Look here for some guidance.

EXTRUSION: Effect of the Screw Flight On Melt Temperature, Energy Use

So-called rules of thumb regarding the design of flight clearance and width do not consider the temperature effect, both from the point of view of melt temperature and energy efficiency.

EXTRUSION: Feedblock Tuning Insert Lets Processors Keep Running

They are also said to allow for greater precision in layer-to-layer thickness control.

HEATING/COOLING: Novel Heaters for Injection Nozzles, Extrusion Melt Pipes

Plasma-sprayed coating with insulating cover provides faster, more uniform heating.

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OVERVIEW:
Film Extrusion

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Film is divided into two subcategories: cast, or flat film; and blown film. In the former, hot plastic is extruded through a flat, slit die onto a polished chill roll where it is quenched, pulled to a second set of rolls to cool the other side, then wound. In blown film, plastic is extruded into a cylindrical die, then inflated to form a bubble, which is ultimately cooled and collapsed. Films can be either single or multi-layer. Most are based on polyethylene. Bags are one primary example of film extrusions.


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