Knowledge base

Polytype is a leading Engineering and Manufacturing Company and manufactures amongother equipment, machines for the paper, film and foil converting industry. Since Spring 1993 and newly from Summer 1999, Polytype will have at their facilities at Fribourg, Switzerland, some of the most advanced multipurpose Pilot Plants in the world. The plants are

The key in achieving good UV flexographic inks is related to pigment wetting, ink rheology and reactivity of the formulated system. Rheological behaviour with the right amount of well-chosen pigment is in direct relation to pigment wetting. These bring many different properties to the formulated ink such as good dispersion, good flow, good transfer

Since its introduction more than 25 years ago commercial radiation curing has experienced a continuous growth as a result of its environmental and technological advantages. Despite having amarket share of only approximately 4% this technology and the corresponding demand for its rawmaterials is expected to show growth significantly above the averag

Vinyl ethers are well known candidates to substitute styrene and monomeric acrylates as reactive diluents in UV formulations due to their better toxicological profile. The paper will demonstrate the ability of vinyl ethers to significantly reduce the formulation viscosity. The copolymerization behaviour of vinyl ethers with acrylates and unsaturate

Water borne systems find a still increasing number of applications such as homogenous and micellar photopolymerization, photografting, surface coating, image , because of their ecologically safe design. A great variety of photoinitiators (Pis) have already been described to be efficient in such systems. Traditional oil soluble photoinitiators have

Time — and particularly the time saved for drying — is an important parameter in automotiverefinishing shops.Now some people might think that boosting the curing temperature to 300 °C is the way forward.Unfortunately it isn't. This approach may well cut the drying time to 5 minutes but will most likelyresult in a melted hat shelf and barbecued loud

Technological advances have made photopolymers increasingly important for applications in fields as different as a printing, coating, microlithography, and electronic device manufacturing. Compared with other photosensitive materials such as silver halides and electrophotography, the of photopolymers is not high and requires ultraviolet light with

UV curable PSA systems have been available for several years. Since this time the interestin the market has grown steadily, but slowly. There appears to be various reasons for thereluctance to adopt this technology on a wider scale. Certainly, the limited range of raw materialsand generally higher prices compared to conventional PSA materials, has