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IntroductionThe techniques for 'the inerting of ali electron beam processor have developed quiteslowly over the past two decades. The requirement of an environment of low oxygenconcentration in which to initiate and complete the addition polymerization processefficiently has been a severe impediment to the industrial use of the technology.Due to th

INTRODUCTIONMost materials capable of photopolymerizatiàn contain initiatorswhich are sensitive only to light at a wavelength below 430 nm.These materials can be processed without difficulty under daylight,conditions, of course; however, a portion of the radiation emittedin'the visible range of the usual types of light sources (e. g.high pressure m

IntroductionThe ultra violet curing of pigmented surface coatings is now well established in the litho and screen printingsectors of the graphic arts. In these systems the pigmentsthemselves cause considerable constraint by absorbing uvirradiation and competing with the photoinitiators for theavailable energy. The darker pigments, blues and blacks

INTRODUCTIONAcrylate oligomers and monomers are very reactive as a class of materials.Because of this reactivity there is apossibility of serious consequences if these materialsare improperly stored or handled. Unfortunately, very little information is available onthe behavior of these specific materials. The purpose of this study was to perform a

1. IntroductionThe development of resins for Stereolithography (SL)needs its own formulation strategy, although some of thecomponents may be identical to those in resists or coatings. In addition to the requirements arising from anintended application of the SL part, the process of 3dimensional laserpolymerization itself imposes stringentrequiremen

1. IntroductionThe printing industry produces a wide range of items such as newspapers,catalogues, brochures, books, etc. An important and specialised branch of theindustry is the production of business forms; in Western Europe in 1987 some1,5 million tonnes of paper were converted to forms (ref. 1).The advent of computers in the 1950's gave a trem

INTRODUCTIONThe increased crosslink density attained when using divinylether reactive diluents in UV curable unsaturated polyester based.coatings can provide improvements in hardness, mar resistance andother properties. (ref. 1) Simply replacing styrene withtriethylene glycol divinyl ether (TEGDVE) in these formulationshowever can lead to problems

INTRODUCTION There is a widespread perception that paper. products printed withradiation cured inks and coatings cannot be recycled as compared to conventionallycured (thermal) systems. From the raw material suppliers to the scrap paper brokers,the Consensus is that landfill or incineration are the only way to deal with suchwaste. There are, of cou