Printing pad

Friday, September 4, 2009

Printing pad
Pads are three dimensional objects typically molded of silicone rubber. They function as a transfer vehicle, picking up ink from the printing plate, and transferring it to the part (substrate). They vary in shape and durometer depending on the application.
There are three main shape groups: "round pads", long narrow pads called "bar pads", and miscellaneous shapes (square, rectangular, etc.) called "loaf pads". Within each group there are three size categories: small, medium, and large size pads. It is also possible to engineer custom-shaped pads to meet special application requirements.
Image plate
Image plates are used to contain the desired artwork "image" etched in its surface. Their function is to hold ink in this etched cavity, allowing the pad to pick up this ink as a film in the shape of the artwork, which is then transferred to the substrate.
There are two main types of printing plate materials: photopolymer and steel. Photopolymer plates are the most popular, providing a good do-it-yourself option. These are typically used in short to medium production runs. Steel plates come in two choices: thin steel for medium to long runs, and thick steel for very long runs. Both steel plate types are generally processed by the plate supplier as it involves the use of specialized equipment.
Printing ink
Ink is used to mark or decorate parts. It come in different chemical families to match the type of material to be printed (please consult the substrate compatibility chart for selection).
Pad printing inks are "solvent-based" and require mixing with additives at the time of use. They typically dry to the touch in seconds although complete drying (cure) might take a substantially longer period of time.
Climatic conditions will significantly affect the performance of any pad printing ink, please bear this in mind when planning the location of your pad printer. Always consult Federal, State and local regulations regarding proper handling, storage and disposal of inks.


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