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Different types of screen printing machines
2020-04-28
Screen printing can be categorized into many types based on the type of plate, the variety of printing press, the nature of the ink, and the type of substrate. However, in terms of its printing method, it can be divided into the following categories.
1. Flat-screen plane screen printing: A flat-screen plane screen printing machine is a method of printing on flat substrates using a flat screen stencil. During printing, the printing plate remains stationary while the squeegee moves.
2. Flat-screen curved-surface screen printing: Flat-screen curved-surface screen printing is a method in which a flat-screen printing plate is used to print onto curved substrates (such as spheres, cylinders, and cylindrical objects). During printing, the squeegee remains stationary, while the printing plate moves horizontally, and the substrate rotates along with the printing plate.
3. Rotary Screen Printing: Rotary screen printing uses a cylindrical screen plate. Inside the cylinder is a fixed doctor blade. The cylindrical printing plate and the substrate move synchronously at a constant linear speed during the printing process.
4. Indirect Screen Printing: The first three methods described all involve the printing plate directly contacting the substrate to produce the print. However, these methods are limited to printing on regular geometric shapes such as flat surfaces, cylindrical surfaces, and conical surfaces. For objects with complex shapes—such as those featuring sharp edges or recessed areas—indirect screen printing is essential. This process typically consists of two main stages: flat-screen printing and transfer printing. In this approach, the image is not directly printed onto the substrate; instead, it is first transferred onto a flat material and then, using a specific technique, transferred onto the desired substrate. One common method of indirect printing involves first using flat-screen printing to create an image on a flat glass surface. Next, a flexible silicone head, similar to a stamp, is used to pick up the ink image from the glass surface and then transfer it onto the irregularly shaped substrate. Another type of indirect screen printing is known as decal transfer, which includes techniques such as screen-printed decals combined with thermal transfer, screen-printed decals combined with pressure-sensitive transfer, or screen-printed decals combined with solvent-activated transfer. Indirect screen printing has now become a major area within the printing industry.
2020/04/28
What is a multi-layer belt dryer?
The multi-layer belt dryer is suitable for large-scale production of materials that are difficult to dry and have low drying rates. The equipment features a compact structure, occupies a small footprint, is simple to operate, easy to maintain, and runs with high stability. It can be designed in various hot-air circulation drying configurations according to the specific drying characteristics of the material, serving as an extension and improvement of conventional hot-air circulation ovens. This dryer is widely used in fields such as metallurgical additives, chemical industry, food processing, packaging, and others. With advancements in enterprise technology and increasing product sophistication, multi-layer belt dryers now possess the capability to meet the demands of large-scale production, diversified applications, centralized control, and continuous operation. They offer advantages such as energy efficiency and ease of management.
2020/04/28
The working principle of a screen printing machine
① Taking the flat-screen, single-color, semi-automatic manual screen-printing machine with a flat-screen platform as an example, its working cycle procedure is as follows: feeding → positioning → lowering the plate → lowering to the ink blade and raising the ink blade → scraping stroke → raising to the ink blade → lowering back to the ink blade → lifting the plate → returning stroke of the ink blade → releasing the positioning → collecting the printed material. In continuous cyclic operations, as long as the functions can be fulfilled, each step should take up as little time as possible, thereby shortening the duration of each working cycle and improving work efficiency. ③ Imprint line. During the printing stroke, the ink blade presses against the ink and the screen-printing plate, causing the screen-printing plate to form a contact line with the substrate; this contact line is called the imprint line. This line...
2020/04/28
Main features of screen printing machines
The screen-printing machine is one of the most representative types of stencil-printing equipment. Its printing plate consists of a fine mesh screen woven from materials such as silk, with clearly defined horizontal and vertical threads that intersect in an orderly fashion. A variety of screen-printing machines have been developed, including flat-bed, curved-surface, shaped, dyeing, printed-circuit, and new rotary models. Among these, the new rotary screen-printing machine boasts high speed and productivity. Its key feature is that the screen mesh is mounted on a rotating cylinder, and ink is poured into the interior of the cylinder. As the machine operates, the cylinder rotates, and a rubber blade swiftly transfers the image onto the substrate. In addition to silk, other materials such as nylon filaments, copper wires, steel wires, or stainless steel wires can also be used to make screen meshes. The principle of stencil printing employed by screen-printing machines originated in ancient stenciling techniques. Stencil printing encompasses several forms, including mimeograph, openwork stencils for spray painting, and screen printing itself. Early screen-printing was performed manually, using just a single frame, a single screen mesh, and a single stencil. It wasn't until the 1950s that screen printing began to be mechanized and automated. Rotary screen-printing machines apply large amounts of ink during printing, making them ideal for producing prints with thick ink layers. They can print on a wide range of substrates—including various types of paper, glass, wood boards, metals, ceramics, plastics, and fabrics—and support the use of multiple types of ink, including conductive metallic inks.
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