A PP PS sheet extrusion line can be configured for single-layer or multi-layer production. This buyer guide explains how layer structure, calender cooling and winding affect food containers, stationery, electronics trays and printed packaging.
PP and PS sheet lines often look similar in a catalogue, yet they serve different product strategies. A thin transparent PS line for cups is not the same investment as a seven-layer PP barrier line.
Single layer or multi-layer?
Single-layer lines are efficient for standard transparent, white, black or colored sheet. Multi-layer lines are valuable for barrier, recycled core, surface gloss and color separation.
Where output gets lost
A quoted output can refer to extruder capacity, melt throughput or saleable finished sheet. Edge trim, start-up scrap, gauge rejection and winding waste all affect the real number.
Thickness control is a system property
The die, melt pump, calender, cooling and tension system all influence thickness. A good gauge sensor cannot correct a cooling system that is too short.
A practical comparison checklist
- Layer structure and resin split by weight
- Working width after edge trim
- Thickness tolerance at target speed
- Finished output and scrap rate assumptions
- Calender roll finish and temperature control
- Winder or stacker matched to delivery format
The lowest-cost PP or PS line is not always the lowest-cost sheet. Compare yield, changeover time and scrap over a full production month.
Related BENK extrusion lines
Need help with your sheet or board line?
Send the material, sheet or board size, thickness, target output and application. BENK will recommend the extruder, die, cooling and downstream configuration.