VTT s functional coating line offers versatility to surface treatment

Transcription

1 VTT s functional coating line offers versatility to surface treatment PulPaper June 2010 Vesa Kunnari VTT Technical Research Centre of Finland

2 2 R2R surface treatment concept New revolutionary surface treatment concept for pilot testing & production Idea of a fixed process completely discarded Single components connected as desired Connection of customized components Small amount of coating needed Sealable coating units & fumes removal during drying For fibre based materials and plastics

3 3 R2R Surface treatment concept available units Un/rewind Winder Flexo-type roll coating Spray-coating Soft-bar coating Curtain coating Air drying units 5 pieces IR-drying Corona Plasma (N 2 -Ar ) UV Egde guidance Spreading roller PLC-guidance Offline calender

4 4 Common features Speed 3 90 m/min Web width max 550 mm Online coating, moisture and temperature monitoring Sealable coating station and drying section Paper, carton board, plastic, non-woven possible Single operational units connected as desired Small amount of coating material needed for trials Characterization toolbox available for analyzing coating colours and treated surfaces

5 5 Product examples Roll coating Thermoplastic starch & embossing Autentification Roll coating Biopolymer below 0.5 g/m 2 Tailored surface properties Soft bar coating & Calendering Traditional pigment & conductive ink Printed electronics Corona / Plasma, Roll coating & spray coating wow, UV Biopolymer & cross-linker Enhanced barrier

6 6 Coating units Flexo-type roll coater Main coating station - sealable Based on flexo-principle Circulation system for coating Coating amount 1 15 g/m 2 of wet coating Paste tray volume 1.5 dm 3 Equipped with fumes removal

7 7 Coating units Spray coater & Curtain coater Coating width adjustable mm Feed pressure bar Min. flowrate 65 ml/min Min. coating demend 1 dm3 1,4 dm3 run continuously Operated simultaniously with roll coater Wet on dry wet on wet Enables adding hardener/cross-linker on separate step Determining stability of coating colors for curtain coating applications Single and multilayer testing possible for coatings Single layer testing on web Sample demand 25 L Coating width 260 mm Max. viscosity 2000 mpas Max. flow 11L/min/m

8 8 Drying 5 seperate air drying units, 1 IR drying unit Drying temperature & air flow adjusted seperately for each unit; top and bottom seperately Drying air fed from both sides of the web Fumes removal with filters Harmful coatings can be operated Drying temperature o C Coating of protein based coatings Bowed to prevent shrinkage of web edges

9 9 Other units web guiding and pretreatment Cross directional guidance of web 2 pieces Winder Accurate un/rewind Paper and plastic No roller alignment after unit reorganizing needed Winder / edge cutting (both edges of the web) Narrowing of web down to 100 mm UV-unit Hardening / activation of coatings Surface treatment Corona-unit & plasma-unit Surface / pretreatment Simultanious operation with UV possible Automatic power regulation (watt/min/m2) Plasma N 2 -Ar based

10 10 R2R Calender For pre or post treatment of un/coated paper Calendering width appr. 300 mm Equipped with polymer and hard roll (soft & hard nip) Nip load kn/m Roll surface temperature up to 250 o C Speed range m/min Web & roll surface temperature measurement High accuracy and repeatability of variables

11 11 VTT characterization toolkit Enables evaluation and tailoring of coating colours and coated surface characteristics Coating colour toolkit Treated surface toolkit Dynamic water retention (DWR) Immobilization cell (Paar Physica) Extentional viscosity (ACAV A2) High shear viscosity (ACAV) Low shear viscosity & viscoelasticity (MCR301) Minimum flow rates for stable curtain in curtain coating Element composition (EDS) Chemical structure (IR) ESCA (thin nanometer scale surface layers) Surface topography Liquid absorption speed & absorpton uniformity Barrier properties (oxygen, water vapour, aroma and grease barrier) Surface energy and hydrofobicity

12 12 SUORA

13 13 VTT creates business from technology