screen printing machine

Screen printer

Used in printing flat, oval, and standard round products. It is consist of working table, screen frame combination, ink Squeegee system, operation controlling system and machine body.

l STRUCTURE

Screen printer has a more simple structure:

1) Working table: Install fixture and substrates. There are five kinds of working table: Flat, round, oval, T model, vacuum. T model working table and vacuum working table keep stillness when printing; other kinds of working table can move up and down when printing, In order to improve production efficency , conveyer working table installed on flat screen printer.this kind of screen printer is suitable printing small dimension objects.

2) Screen frame combination: Install screen plate and store ink.When printing flat products, frame keep stillness; when printing cylinder, screen frame move from left to right.

3) Squeegee nip combination: Install rubber squeegee and supply ink for coating on the surface of silk. Rubber blade move up-and-down, meantime ink floor move with opposition direction. When printing flat products, squeegee nip combination move left to right, when printing cylinder products, they keep stillness. Squeegee rubber finish printing and ink floor finish coating.

4) Operation controlling system : Most of screen printer controlled by micro-computer built in to make machine stability and easy to operate. When testing, only press simple action key and when starting automatic key to begin printing will be helpful to operate screen printer.

l MAINLY FACTOR

1) Screen plate:

Making screen plate through three kinds of way: emulsion, direct film, indirect film. Different substrates need different technology parameter such as: silk tension, count, thickness of emulsion. Water base and solvent base emulsion coated according to different products.

2) Screen printing ink:

Choosing solvent screen ink, UV ink and function plasma according to printing request. Ink must be test before printing.

3) Rubber squeegee:

Ink pressed to deposit onto the products by rubber squeegee. Rectangle squeegee is for flat substrate and triangle squeegee is for cylinder substrate. Harder squeegee get more precision printing result than softer squeegee.

4) Fixture:

It is important to make fixture according to products. Regular products need the fixture made by lathe or CNC. Complex products need the fixture made by polyester resin. Round products need same diameter transmission gear with product diameter.

l SORTS

1 Manual controlling, compression air controlling screen printer, Plastics bottle multicolor cylinder screen printer, Round screen printer , oval screen printer , T model screen printer , vacuum table screen printer single-piece screen printer, electron controlling, to be sorted according to action supply. Most of screen printer in china market is controlled by compression air.

2. One colour, two colours, screen printer to be sorted according to max printing colour numbers. One colour screen printer print one colour one time; two colours pad printer print two colours in one product one time. One colour screen printer is simpler, but multicolor screen printer has more complex structure and volume. widely use in printing cosmetic and other industry package.

3. to be sorted according to different working table installed. Round working table screen printer print round products; oval working table one print oval bottle; T model screen printer print rigid flat products and vacuum table screen printer print paper and soft film products.

4. Different feed transmission way sort screen printer as and web-roller screen printer. Most of screen printer is single-piece screen printer.

Types of fully automatic screen printing machines

There are many types of fully automatic screen printing machines. The common classification methods and specific types are as follows:

1. Classification by the type of printed substrate:

• Paper-type fully automatic screen printing machine: mainly used for printing on paper, such as various book covers, posters, leaflets, etc. This type of screen printing machine has good adaptability to paper transportation, positioning, and ink adhesion.

• Plastic-type fully automatic screen printing machine: suitable for printing on plastic substrates, such as plastic bottles, plastic containers, plastic films, etc. Since the surface properties of plastics are different from other materials such as paper, this type of screen printing machine will have corresponding adjustments and optimizations in ink selection, printing pressure control, etc. to ensure printing quality. For example, it is widely used in cosmetic packaging, food packaging and other fields.

• Ceramic-type fully automatic screen printing machine: specially used for printing on ceramic products, such as ceramic tableware, ceramic decorations, tiles, etc. The surface of ceramic materials is relatively rough, and the requirements for ink adsorption and printing firmness are high, so this type of screen printing machine is usually equipped with special inks and printing processes to meet the needs of ceramic printing.

• Glass automatic screen printer: mainly used for printing on glass substrates, such as glassware, glass doors and windows, glass crafts, etc. The glass surface is smooth, and the printing accuracy and ink adhesion are required to be high. At the same time, the fragility of glass needs to be considered, and the stability and safety of operation must be ensured during the printing process.

• Circuit board automatic screen printer: used for the production of printed circuit boards (PCBs), widely used in the electronics industry. The printed patterns on the circuit boards require high precision and clear lines, so this type of screen printer needs to have high-precision positioning and printing capabilities, and can accurately print ink at the designated position on the circuit board.

• Metal automatic screen printer: suitable for printing on metal substrates, such as metal sheets, metal products, metal packaging, etc. The hardness of the metal surface is high, and the wear resistance of the screen printer's scraper and screen is required to be high. At the same time, special inks and curing methods are required to ensure the firmness of the printed pattern.

• Textile automatic screen printer: mainly used for printing on textiles, such as clothing, fabrics, curtains, etc. Textiles are soft and easy to deform, so this type of screen printing machine needs to have a good fabric conveying and positioning system to ensure the accuracy of printing.

2. Classification by the structure and working mode of the printing machine:

• Flat screen printing machine: It uses a flat screen plate to print on a flat substrate. It is the most common type of fully automatic screen printing machine. Its working principle is that the squeegee presses the printing plate and moves horizontally, and the substrate is changed by the rise and fall of the printing plate. It is suitable for printing various flat materials, such as paper, plastic sheets, metal plates, etc.

• Curved screen printing machine: It uses a flat screen plate to print on a round or curved substrate. The squeegee is usually fixed, the printing plate moves horizontally, and the substrate rotates with the same linear speed of the printing plate. It can be printed on various curved objects, such as cylindrical containers, spherical objects, irregular surfaces, etc.

• Rotary fully automatic screen printing machine: It uses a cylindrical screen plate, and a wedge-shaped squeegee or squeegee roller is installed inside the cylinder. The linear speed of the printing plate rotation and the movement of the substrate is the same. This type of screen printer has a fast printing speed and high efficiency, and is suitable for large-scale continuous printing operations. For example, it is widely used in the printing of materials such as plastic films and paper rolls.

• Elliptical fully automatic screen printer: It has a rotary structure, coaxial platform rotation, variable frequency electric printing, and mechanical fast positioning. It has many workstations and an expandable structural design. It can combine printing and drying workstations according to actual conditions. It is often used for printing clothing pieces and can print paste, water slurry, ink and other slurries.

3. Classification by other special functions or application areas:

• IT window glass fully automatic screen printer: Developed and designed to meet the needs of the IT industry for high-precision, intelligent and automated screen printing equipment, it can automatically transfer and has machine vision positioning and printing functions, and can automatically connect with the previous and next processes.

• Solar crystalline silicon cell fully automatic screen printer: It consists of fully automatic film loading, film storage, automatic film feeding, machine vision automatic positioning, automatic printing, automatic transfer and film output systems, and is mainly used for screen printing of solar crystalline silicon cells.

• PCB process fully automatic screen printer: designed for the circuit board (PCB)'s demand for high-precision, intelligent, and automated screen printing equipment, it has CCD visual recognition automatic alignment, automatic transmission, and printing functions, and can automatically connect with the previous and next processes.

• Optoelectronic Display Technology Fully Automatic Screen Printer: Horizontal design, consisting of three parts: import, print, and export. It uses CCD visual automatic alignment, high precision, and is suitable for high-precision fully automatic screen printing of flat substrates, such as PLC, EL, LED, IMD, glass, PCB circuit boards, etc.

Sorts		Characteristic	Application	Model	Ink type
Sheet -fed screen printing machine
Shee-fed Screen printer	Oblique- type Screen printer	Mechanical control，working speed fast, screen plate drop with slant angle.	Packaging decoration,credit card Screen printing.	S-JY6090PV S-JY80120PV	UV Solvent base
	Vertical rising	Mechanical, Pneumatic control, screen plate drop with vertical direction	Gify case, credit card, , Household appliances，Plastics accessories , Photo frame, Membrane circuit, Photovoltaic， Electron.	S-3848PV S-4565PT S-4060PT PS-6080PV S-81110F	UV Solvent base
	Full automatic	Auto feeding, UV Drying or IR Heating system	Ceramic,Building materials ，Glass,Paper industry，Credit card, Package case.		Heat-set ink Solvent base UV
Flat screen printer		Auto feeding, Tension control, Rectification device, Sensor controlling system.	Web paper, webbing, Film,Label screen printing ，nonwovens , Rubber.		Heat set ink UV Solvent base
Curve screen printer	Semi- automatic	Pneumatic controlling,, screen print drop or table rise, speed slow, The table install rotary device	Plastics container, metal, Glass container, all round objects , Auto industry, Plastics industry, articlesevery day	S-75S S-125S S-220S	Solvent base UV
Curve screen printer	Full automatic	Auto feeding system, Transmitting device, UV Drying system, and use UV ink, overprint is easily, high speed.	Plastics container, soft tube, cosmetic case , bottle cap.	SZD-1022 SZD-VR12UV	UV
Turn- workbench Garment screen printer	Round-type	Workbench and screen plate rotate around the center axis，Floor space small,.	Clothing, Garment, CD.	SM6-4565 SM8-5070	Heat set ink
	Oval-type	Workbench rotate around oval orbit , floor space big. Full automatically controling and IR Drying	Clothing, Garment, CD.		Heat set ink

Screen printing fixture

1. Definition

The fixture of the screen printer is used to fix and position the substrate (such as electronic product housing, plastic parts, glass sheets, etc.), ensuring that the substrate is accurately and stably positioned during the screen printing process, and ensuring the accuracy and consistency of the printed pattern.

2. Types

• Plane fixture:

• Used to fix flat substrates, such as paper, plastic plates, etc. It is usually a flat metal or plastic plate with positioning pins or positioning holes on it, which can be precisely positioned by matching with the corresponding holes or edges on the substrate.

• Curved fixture:
For curved products, especially cylindrical products, the fixture should be able to ensure the fixation of the central axis direction and the rotation in the circumferential direction. Generally, gear racks are used in conjunction with the fixture. For conical products, the fixture should ensure that the product rotates along the fan-shaped track. The curved fixture should have a blowing function for soft bottles!

3. Design points

• Accuracy requirements: The positioning accuracy of the fixture is the key. In order to ensure the accuracy of the printed pattern, the dimensional tolerance of the positioning part of the jig (such as positioning pins, positioning holes, etc.) should be controlled within a very small range, and the general accuracy can reach ±0.05 - ±0.1mm, so as to ensure that the position error of the substrate after each placement is extremely small.

• Material selection: The material of the jig should be selected according to the nature of the substrate and the requirements of the screen printing process. For general flat printing, metal (such as aluminum alloy) or engineering plastic (such as ABS plastic) are commonly used materials, which have good strength and stability. If it is used for high-precision electronic product printing, high-precision processed stainless steel materials may be used to ensure the long-term stability and accuracy of the jig. For the jig part that needs to be frequently exposed to chemical inks, the material also needs to have a certain degree of corrosion resistance. Some screen-printed products have complex and irregular shapes, and the jig can be made by casting unsaturated polyester resin.

• Compatibility with screen printers: The size and installation method of the jig should match the printing platform and workflow of the screen printer. The fixture should be easy to install and remove, and should not affect the normal operation of the screen printing machine after installation, such as the movement of the squeegee, the lifting and lowering of the screen, etc.