The hardness of the printing squeegee is from HS65 to 75, and the squeegee and printing effects are better. In the printing, the ice printing ink adopts the discontinuous solidification method, the transmission speed of the printing material on the belt of curing machine is 25- 35 meters/ minute. The curing light source consists of six UV lamps arranged side by side with a power density of 60-80 W/cm. When curing, after passing through the first 3 UV lamps, the printed product should be blown in the cooling zone, then enter the curing zone of the rear 3 lamps, and then blown with cold air, so that the curing effect is better.
Refractive screen printing process
The refractive screen printing technology that has emerged in recent years is a new star in the packaging screen printing family. The traditional refraction effect is generally to produce a copper-zinc plate with a refractive texture first, and press a line with different angles on a gold or silver card paper with a round press or a round press-type letterpress printing machine to produce a refractive light texture effect. The disadvantage of the method is that the plate making cost is high and the effect is not ideal. The screen printing can easily print ultra-fine concave and convex lines on the mirror gold and silver card paper. After the light irradiation, it will produce colorful refraction effect, making the screen printing box more noble and gorgeous.
Refractive screen printing process flow is: refraction manuscript design → stretch net → cleaning coarse screen version → coating photosensitive adhesive → exposure → development → revision → double exposure → printing.
1. Refraction manuscript design
The main points of the design of the refraction manuscript are as follows: The part of the image where the refraction point is required is drawn as a millimeter digraph, and the length of each millimeter is divided into 5 to 8 bisectors. Each bisector is divided into 10 to 16 black-and-white and the like. Points, taking 16 as an example, can be designed as black 4 white 12, or black 8 white 8. The lines are divided into three types: straight lines, arcs, and ellipses. Lines and arcs are kiss-connected with image changes.
The refractive pattern is fine and complex in appearance, and its internal structure cannot be seen with the naked eye. Under the microscope with 40 times or more, it can be seen at a glance that the reticle map is composed of several segments or several tens of segments arranged at equal distances but with different angles and arcs. The thickness of the broken light bar should be 0.10 to 0.15 μm, and can be produced by a high-resolution laser imagesetter.
2. Making a refractive screen
(1) Screen selection and stretching. The production of refractive index screens must use suitable screens. The screens are required to have good elasticity and friction resistance. The retractility rate should be very small, the mesh opening should be large, and the printing ink layer should be thick. Polyester wire mesh is an ideal choice, the general choice of mesh is 390-420 mesh/inch.
When the net is stretched, a diagonal stretch netting method with an angle of 22.5° is selected, and the tension of the netting is required to be 18 to 22 N/cm. For the new stencil screen plate must be cleaned and roughened, which has a very important impact on the quality of the screen.
(2) Coated photoresist. Whether it is using automatic gluing or manual gluing, it must be ensured that the coating is even and smooth. The number of refraction screen sizing depends on the thin consistency of the sensitized adhesive, which usually takes 4 times. During the first gluing, the squeegee should be evenly scraped on both sides of the screen, so that the sensitized adhesive fills the mesh evenly, and then it is dried in a drying oven at 40°C. On the 2nd and 3rd times, only the glue on the printing surface can be dried, and on the 4th time, the glue on the squeegee surface is dried.
(3) Exposure. The broken light bar is more detailed, more dense. In order to ensure the quality of the printing plate, it is necessary to use a printing machine with a vacuum adsorption device to print. When printing, the film should be closely attached to the screen photosensitive film surface, and the printing time should be appropriate. If it is too long, it will be difficult to develop. If it is too short, it will affect the screen printing resistance and the folded light stripe will also become thicker. The test strip can be used to measure the exact exposure time required.
(4) Development. Put the dried screen plate into the shaded pool. The depth of the tank is 20~30cm. The screen plate should be soaked in water for 1 minute. Afterwards, the screen plate is repeatedly pressed into the water, and the photosensitive part of the image part is squeezed by water pressure. Press it out and clean it. In order to ensure that the refractive index of the refractorial screen is uniform, it is necessary to use a low-pressure water gun for the development. After sufficient development, dry it.
(5) Revised edition. Check the layout for defects such as pinholes and air bubbles, and perform repairs.
(6) Double exposure. After the screen drying, the second exposure is performed to completely cure the photosensitive film of the screen and improve the printing resistance of the screen.
3.UV refraction ink
UV-reflecting inks produce unique refractive effects only when printed on the surface of a mirror-printing material. During printing, an appropriate amount of diluent can be added for dilution.
4. Refractive screen printing
If the area of ​​the refraction printing graphic is large, it must be completed with a high-precision screen printer in order to ensure the quality. A small area can be printed by hand. Refractive laser screen printing requires operators to understand the production of high-quality screens, the hardness, angle and pressure of the squeegees, and the properties of UV-refraction inks, so that they can take corresponding actions in response to various problems in the production process. Countermeasures.
Precautions
1. The screen printing inks of the same type produced by different manufacturers also have certain differences in quality and performance. Generally, they must be tested and printed first, and then the mass production should be carried out after determining the quality is stable and reliable.
2. The ink must be fully stirred before use, especially in the mixed use of several patterns of ice flower ink, it is best to use a bamboo plate to stir, when used in large quantities is best to use a wide-blade stirrer.
3. Carefully check the curing of the ink so as not to affect the hardness and adhesion of the ink layer due to incomplete curing.
4. Temperature changes will change the viscosity of the ink, resulting in differences in the printing effect, so the ink should be put into the printing shop in advance to make it adapt to the workshop temperature and ensure the stability of the quality.
5.UV ink is irritating to the skin. Take care when using it to avoid contact with the skin. If the skin is stained with ink, wash it with soapy water immediately.
6. The ink should be stored under low temperature (2～18°C), protected from heat and light, and the storage period is generally 6 months so as not to change the ink performance.
Source: Coinprint
A training chair is a seat designed specifically for activities such as training and meetings. It has the characteristics of comfort, durability, and ease of movement, which can meet the needs of different groups of people. Training chairs can be classified into various categories based on material, structure, function, and other aspects. Below will be a brief introduction to the classification of training chairs.
1. Material classification
The materials of the training chair mainly include metal, plastic, and fabric. Metal training chairs typically have strong stability and durability, making them suitable for long-term meetings or training activities. The training chair made of plastic material has the characteristics of lightweight and easy to clean, making it easy to arrange the meeting site at any time and suitable for use in multifunctional halls and other places. The training chair made of fabric has a comfortable sitting experience and good breathability, making it suitable for long-term meetings or training activities.
2. Structural classification
The structure of training chairs mainly includes single chairs, linked chairs, and foldable chairs. Single chairs are the most common training chairs, with each seat being independent and adjustable as needed. Chainage refers to the connection of multiple seats together, usually in the form of one or more rows, suitable for use in large training venues. Stackable chairs are training chairs that can be folded and stacked, saving space and facilitating storage and handling.
3. Functional classification
The main functions of the training chair are adjustable, rotatable, foldable, and storable. The adjustable training chair can adjust the height and angle according to personal needs, providing a more comfortable sitting posture. The rotatable training chair can rotate 360 degrees, facilitating communication and interaction with people around it. The foldable training chair can be conveniently stored and transported, making it suitable for use in multifunctional halls and other places. The training chair that can store items is designed with storage space below or behind the chair, making it convenient to store items such as stationery and documents.
In summary, the classification of training chairs mainly includes material classification, structural classification, functional classification, etc. Choosing a suitable training chair can provide a better user experience and improve the effectiveness of training and meetings.
Meeting Chair,,Foldable Chair,Customized Chair
Foshan Shengshi Zhihui Technology Co., Ltd. , https://www.szhfurniture.com