scraper
Screen printing squeezes play an important role in transferring ink through the mesh to the substrate, and are extremely important tools in both manual and mechanical screen printing.
Squeezer, including in screen printing ink plate and ink back plate, in general, the squeezer plate is referred to as the scraper, commonly known as the scraper.The ink scraper is a tool to squeezes the ink on the screen onto the substrate. It is composed of rubber strip and clamp (handle, generally made of wood or metal). There are two parts: hand scraper and machine scraper.Return ink plate is the squeezer plate squeezes to one end of the ink sent back to the start of the squeezer position tool, return ink plate is mostly metal products.When printing by hand, only the ink scraper, ink return operation is also done with the scraper.
In screen printing, ink is transferred to the substrate by moving the squeegees under certain pressure through the screen plate.Therefore, the various indicators of squeegee affect the printing effect.
One, squeegee effect
In screen printing, the function of squeegee mainly has the following three aspects.
(1) Ink filling
Scraper, not only make ink leakage on the substrate.At the same time the ink can be fully filled into the screen through the ink part of the mesh.
(2) Homogenizing effect
In printing, the squeezer squeezes ink from one end of the plate to the other by transferring it through the mesh to the substrate to form a graphic image.In order to make the next scratch printing when there is enough ink, by the back ink board evenly, the ink evenly scraping back to the starting point of printing, so that the ink through the graphic part of the mesh, to prevent the mesh of ink due to drying.
(3) Imprint
To ensure the printing of different shapes of substrate.In the operation of the scraper, the ink scraper at the same time a certain force, so that the screen and substrate to maintain line contact, complete the scraping.In manual printing, the scraper is both the scraper and the ink board.While in mechanical printing, two scraper ink board and ink back board, printing and ink back with two types of ink board.Only the above three functions of the squeegee get a good play, in order to print high-quality prints.And the physical properties of the scraper and the above functions play a decisive role (such as the hardness of the squeezer can be very good to scrape off excess ink, but not very good to meet the various substrate shape requirements).Therefore, in the selection of squeegee, it is necessary to fully consider the performance of squeegee factors on the above functions, to avoid adverse effects on the printing effect.