Laminar plastic product i.e. film, producing method, involves reducing volume flow of molten mass in edge regions of channel relative to middle region of channel, and controlling volume flow of molten mass relative to quantity and/or speed

摘要

#CMT# #/CMT# The method involves extruding a melt layer (9) from a delivery channel (1). Edge regions (4.1, 4.2) of the channel are thinner than a middle region (7) of the channel. A volume flow (6) of molten mass in the edge regions of the channel is reduced relative to the middle region of the channel by changing geometry of the edge regions. The volume flow of the molten mass is controlled relative to quantity and/or speed. The melt layer is stretched after emerging from a flat die. Edges (8.1, 8.2) of the melt layer are thinner than a cross-sectional thickness (d) of a laminar plastic product. #CMT# : #/CMT# An independent claim is also included for a device for producing a flat plastic product. #CMT#USE : #/CMT# Method for producing a laminar plastic product i.e. film (claimed). #CMT#ADVANTAGE : #/CMT# The volume flow of the molten mass is controlled relative to quantity and/or speed, thus producing the flat plastic product with homogenous thickness and/or breadth. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic representation illustrating steps involved in a method for producing a laminar plastic product. d : Laminar plastic product cross-sectional thickness 1 : Delivery channel 4.1, 4.2 : Delivery channel edge regions 6 : Volume flow 7 : Delivery channel middle region 8.1, 8.2 : Melt layer edges 9 : Melt layer.