Print-free test

Print-Free Test (ISO 3678). A square of polyamide gauze is pressed onto the surface. The surface is print-free" if no imprint can be seen. 

A melamine laminating resin used to saturate the print and overlay papers of a typical decorative laminate might contain two moles of formaldehyde for each mole of melamine. In order to inhibit crystallization of methylo1 melamines, the reaction is continued until about one-fourth of the reaction product has been converted to low molecular weight polymer. A simple deterrnination of free formaldehyde may be used to foUow the first stage of the reaction, and the build-up of polymer in the reaction mixture may be followed by cloud-point dilution or viscosity tests. 

Finally, the conversion of mineral oil-based offset newspaper inks to mineral oil-free inks is the most promising option. In the sense of ecological actions, it is now the time to work seriously on this conversion which requires for sure further research needs. The developments on mineral oil-free inks stopped about 15 years ago have to be adopted on the new generations of offset printing machines. The deinkability of those inks causes promise to find fast industrial solutions eventually via a first step with mineral oil-reduced offset inks. Nevertheless, the deinkability found to be all right at that time has to be tested again. 

Good dextrins for printing should give on wool (Test 15, a, above) a good pink tint quite free from yellow and on cotton (Test 15, b) a bright pink tint. 

Small traces of hypo in films or prints accelerate the rate of deterioration. It is difficult to test for small quantities of hypo, but the following test will indicate when the film or prints may be considered reasonably free from hypo. 

InChl (pronounced In-chee called IChl until 2004) stands for lUPAC International Chemical Identifier, and was developed to enable the easy linking of diverse data compilations, whether print or electronic. The name InChF is protected, but use and development of InChl identifiers is free access, and the source code and associated documentation can be downloaded for free from www. iupac.org/inchi. Source codes can be modified under the terms of a public licence, and lUPAC welcomes proposals for enhancements. Following beta-testing, the current version (1.02) is full release (January 2009). 

A VUV Free Electron Laser at the TESLA Test Facility at DESY -Conceptual Design Report (DESY Print, Hamburg 1995). 

The UV technology alluded to above holds out the promise of even more superior labels. In this process, ultraviolet cured inks are used as the printing medium. These are cured by exposure to industrial type UV mercury vapor lamps in either a non-inert system (air environment) or in an inert (oxygen-free) system. The result is excellent adhesion to vinyls, polyesters, polycarbonates, butyrates and acetates and a cured elongation of between 20 and 40% to avoid embrittlement of the substrate. Initial testing has exhibited little sign of degradation and excellent chemical resistance after three years of exterior exposure. Such UV labels as well as other techniques should be considered whenever use demands extended label performance. 

Two different access rights can be chosen with a key operated switch. For example in the STAND-BY state with the key operated switch set to the FREE position the operator can start the sampling period, read and write all system parameters, display the actual pressure and temperatirre, display the error list, print out the logbook, perform test functions. 

Uses Detoamer tor water-based printing inks and overprint varnishes Features Free ot min. oil test foam knockdown long-term persistence exc. compat. user triendly (easy to incorp. in grind and letdown, should not cause pinholes or tisheyes and plate swelling)... 

There was not an opportunity to run a continuous web of hologram material on a print station so that all the steps in the process were tested in sequence. A limited number of methods could be used to plate metals In a printing operation. A method of choice is a viscous plating solution. This could be applied over the catalyzed hologram using a gravure press. It would then be heated to accelerate metal deposition and then washed free of the spent plating solution. 

Tried-and-tested flame retardant systems based on bromine compounds will continue to be used, with just a few exceptions, on account of their outstanding price-to-performance ratio. This is clear from printed circuits, where halogen-free reactive and additive FR systems are not able to displace the FR4 laminates based on tetrabromobisphenol-A (TBBA). Such is the case in Europe, at least. The situation could prove to be different in Asia, since the giants in the sector, such as Sony, have committed themselves to halogen-free printed circuits. In Europe and Asia, iimovations in flame retardant plastics continue to be in the field of halogen-fi ee systems. 

Freda, Michael, and Furlong, Jason, Application of Reliability/Survival Statistics to Analyze Interconnect Stress Test Data to Make Life Predictions on Complex, Lead-Free Printed Circuit Assemblies, EPC 2004, October 2004. 

The reaction of free metals with phosphomolybdic acid (see page 87) can be used for rapidly detecting free metal in zinc oxide and other oxides. This test can also be applied to metallic dusts on decorative wrappings, printed paper, etc. The basis of the test is the formation of the highly colored molybdenum blue by the action of phosphomolybdic acid with free metals and alloys. 

R. Bonifacio, C. Pellegrini, I.M. Narducci Opt. Commun. 50, 373 (1984) A VUV Free Electron Laser at the TESLA Test Facility at DESY Conceptual Design Report (DESY Print, Hamburg 1995)... 

---