Generally, higher bulk papers are more obscure and rougher than lower bulk papers, although lower bulk papers, with their smoother outside, will be capable of reproducing finer printed images.
Sunday, February 24, 2008
Book Paper
Sunday, February 17, 2008
Line Printers
Comb printers characterize the third major design. These printers were a hybrid of dot matrix printing and line printing. In these printers, a comb of hammers printed a part of a row of pixels at one time (for example, every eighth pixel). By shifting the comb back and forth slightly, the complete pixel row could be printed (continuing the example, in just eight cycles). The paper then highly developed and the next pixel row was printed. Because far less motion was involved than in a conservative dot matrix printer, these printers were very fast compared to dot matrix printers and were competitive in speed with formed-character line printers while also being able to print dot-matrix graphics.
Line printers were the fastest of all impact printers and were used for largeness printing in large computer centres. They were almost never used with personal computers and have now been replaced by high-speed laser printers.
The heritage of line printers lives on in many computer operating systems, which use the abbreviations "lp", "lpr", or "LPT" to refer to printers.
Sunday, February 10, 2008
Modern Print Technology
Toner-based printers work using the Xerographic standard that is at work in most photocopiers: by adhering toner to a light-sensitive print drum, then using static electricity to transfer the toner to the printing medium to which it is fused with heat and pressure.
The most regular type of toner-based printer is the laser printer, which uses precision lasers to cause adherence. Laser printers are known for high quality prints, good print speed, and a low (Black and White) cost-per-copy; they are the most general printer for many general-purpose office applications. They are far less frequently used as consumer printers due to a high initial cost.
Laser printers are existing in both color and monochrome varieties.
Another toner based printer is the LED printer which uses an array of LEDs as an alternative of a laser to cause toner adhesion to the print drum.
Recent research has also indicated that Laser printers produce potentially dangerous ultrafine particles, possibly causing health problems associated with respiration. The degree of particle emissions varies with age, model and design of each printer but is commonly proportional to the amount of toner required. Furthermore, a well ventilated workspace would allow such ultrafine particles to disperse thus reducing the health side effects.