Interview with Diego Ferrari, Sales Manager, Product Line Coating, Bobst Italia S.p.A.
What are today’s challenges in extrusion coating?
Extrusion coating and extrusion laminating are key processes to creating sophisticated packaging solutions, also allowing very thin coating weights. With the extrusion technology customers are able to cover a wide array of applications catering to different products and markets; these range from milk/juice cartons and aseptic drink containers to flexible packaging (e.g. snack foods, toothpaste tubes, medical packaging); industrial wraps (e.g. drum liners and composite cans); plastic coated table cloths, insulation backed materials and sacks.
Bobst Italia S.p.A, I-15020 San Giorgio Monferrato (AL), www.bobst.com
Adhesion in extrusion coating – the X-factor
Interview with Erik Bijleveld, Product and application development, Yparex B.V.
What do you call the X-factor in extrusion coating of adhesives?
In a typical extrusion coating packaging for juice, milk, or pudding, a maleic anhydride modified extrudable adhesive resin is applied, if a barrier material like polyamide or EVOH is used in the film concept. Maleic anhydride modified adhesive resins are usually prepared by grafting in a twin-screw extruder. Suitable raw materials and know-how are necessary to formulate the perfect maleic anhydride modified material. We call the know-how the X-factor.
Yparex B.V., Goolkatenweg 10, NL-7521 BG Enschede, The Netherlands, www.yparex.com