Clear Print Area

Required on front folder in a clear, sharp, permanent-type print in black ink. Permanent adhesive labels may be used in a clear, sharp print. Printing must withstand a Scotch Tape Test, which consists of pressing a strip of Scotch tape firmly on the printed area and removing it. There should be no transfer of the printed area on the tape. 

Clearly, the long term commercial viability of the current plates depends on the development of an ink of acceptable tack which will perform at normal press temperatures without toning. If this cannot be done with ink formulation alone, changes in the surface energy of the plate non-printing area may be required. 

Clearing n. The treatment of printed fabrics with a chemical solution to improve the appearance of the whites. In many cases the treatment also brightens the printed areas. 

Since the rheology of many systems depends largely on the temperature, accurate and reproducible measurements require very careful temperature control. A 1°C temperature drop, for instance, increases the apparent viscosity / of an offset printing ink by approximately 15%. To demonstrate the correlation between thixotropy and temperature, Figs. 56 and 57 show the flow curves at different temperatures for two offset printing inks [134], Both materials clearly lose thixotropy-indicated by the area under the thixotropic loop-as the temperature increases. This effect is much more pronounced in the first case (Fig. 56), while the second ink exhibits a very slow decrease thixotropic behavior (Fig. 57). 

P.R.2 does not show perfect performance in special applications (Sec. 1.6.2.3) in prints, which is also true for a number of other members of this class. In this respect, P.R.2 is inferior to P.R.112. This may have a particular impact on marginal areas of pigment applicability. P.R.112 letterpress proof prints, for instance, tolerate mineral spirits and soap while P.R.2 prints only reach step 4 on the 5 step fastness scale. P.R.2 specimens are also sensitive to clear lacquer coatings and to sterilization. 

Pigment Red 8 affords clean, bluish shades of red. It is primarily used in the printing ink industry. P.R.8 exhibits high tinctorial strength and produces brilliant prints. Commercially available types with specific surface areas between about 50 and 60 m2/g afford transparent prints. P.R.8 is used in prints which require no particular solvent resistance. However, the pigment tolerates solvents much better than the yellower P.R.7 in this respect, P.R.8 matches the yellower, but more light-fast P.R.5. The prints are fast to soap but not entirely stable to butter and paraffin. P.R.8 is sensitive to clear lacquers coatings and to sterilization. It tolerates exposure to 140°C for 30 minutes. 

Cylindrical or rectangular bulk storage tanks, 2500-15000 liter capacity these are commonly fitted with delivery and ventilation pipes and an outlet pipe complete with a tap a few inches from the bottom. Although plastic tanks are sometimes used, those made with mild steel are more widespread. Clear marking of the tank is essential, and this is usually done with a label that cannot be altered and that is placed in a conspicuous area such as near the access opening. Safety and handling aspeets in a printed form should always be readily available, preferably in a plastic holder, secured to the tank. 

Enzyme micro-electrode arrays, on exposure to differing concentrations of the substrate acetylthiocholine chloride (Fig. 24.4), demonstrate that above concentrations of 1 mM, responses tend towards a plateau. For this reason, all sensory inhibitory responses to pesticides were recorded in the presence of 2 mM acetylcholine. It should be noted that since sensor responses are recorded in the order of hundreds of nA, it is clear that some current amplification must be operating to achieve currents of this order of magnitude. This is particularly obvious when working electrodes of 0.5 cm2 were used, which only present a combined microelectrode array area of approximately 1 x 10 5 cm 2 per screen-printed electrode (if the total number of micro-electrodes that can be produced by this technique is 2 x 105 cm 2 [2-4]). 

Squeegee the print or negative and place one drop of the solution on a clear area such as the border (you can use an unexposed negative or print that has been processed in the fixer being tested). Wait 2 or 3 minutes then remove any excess solution with a clean white blotter. 

---