Brückner BOPP / BOPET tenderframe plant

Number of layers 3
Overhaul/renovation several
Film structure A B C
Material BOPP
Output 2500 kG / H
Width (mm) 7400
Head description 7 heating zones - 45 Kw heating power - lips 1,7 - 3,5 mm
Die width 1054 mm
Thickness controll system automatic by 37 heating bolts
Chill roll unit width 1400 mm diam 2.400 mm
MDO description pulling unit thermo heated calenders, rollers width 1200 mm, MDO ratio 1: 1/ 10:1- slow section 2 x 60 m/ min ;high speed section 9 x 250 m/min, Preheating calenders 18 , 6 pulling rollers , 2 stabiizing rollersn
TDO description Max stretchin width 8500 mm, effective max width capacxity 6700 - 7500 mm, 7 heating zones by air blowers and thermo oil heaters
Rewinder width 7200 mm
Rewinder description Diam mandrels 450mm.Lenght mandrels 7800mm. Winding speed 250m/min. Tension film 150/700N. 2 alternating winding stations
Slitter year 1988, 7200 max width film; Diam unwinder 1000mm - 900 diam rewinder. 200 mm min cut. 2000mm max cut. Speed 800m/min

Biaxially oriented polypropylene (BOPP) and Biaxially oriented polyester (BOPET) are commonly produced in tender-frame lines. In these lines material is melted through a flat extrusion die (T-die) and solidified onto a cooled roller. Material is then stretched in machine direction in an MDO. Thereafter material is stretched in transversal direction in a TDO. These processes deliver a molecule orientation in both axes, this enhances many of their properties, particularly the mechanical, impact, barrier and optical properties.