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This number lets the printer or software know the intended size of the image, or in the case of scanned images, the size of the original scanned object. For example, a bitmap image may measure 1,000 × 1,000 pixels, a resolution of 1 megapixel. If it is labelled as 250 PPI, that is an instruction to the printer to print it at a size of 4 × 4 ...
Fluid surface tension naturally pulls a stream into droplets. Optimal drop sizes of 0.004 inches (0.10 mm) require an inkjet nozzle size of about 0.003 inches (0.076 mm). Fluids with surface tension may be water based, wax or oil based and even melted metal alloys. Most drops can be electrically charged.
When current is applied, the crystal changes shape or size, increasing the pressure in the ink channel and thus forcing a droplet of ink from the nozzle. [7] [8] There are two types of crystals used: those that elongate when subjected to electricity or bi-morphs which bend. The ink channels in a piezoelectric ink jet print head can be formed ...
The use of a piezoelectric device should not be confused with Drop-On-Demand Inkjet which uses the piezo to generate sound waves in nozzles or expand the fluid chamber size to push single drops from a nozzle. The CIJ formed ink drops are either deflected by an electric field towards the desired location on the substrate or collected for reuse.
These movements are one of the reasons for the time lag in the ink jet printing. In the case of edgeline printing technology, the print head is wide enough to cover the size of the printing paper supported in the printer. The print head has ink jet nozzles for the full length of the print head. By this arrangement the print head need not move ...
Wide-format printers usually employ some variant of inkjet or toner-based technology to produce the printed image; and are more economical than other print methods such as screen printing for most short-run (low quantity) print projects, depending on print size, run length (quantity of prints per single original), and the type of substrate or ...
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