Why Does Stenter Block

  • In the fully automatic Stenter printing process, screen clogging is an aspect that cannot be ignored by the fully automatic Stenter. In the printing process, there are many reasons why the fully automatic Stenter is blocked. The main reasons for this phenomenon are: 1. Large ink particles; 2. After the ink dries on the screen, it will become conjunctival; 3. Excessive ink viscosity will affect printing oil leakage; 4. Ink flow at low temperatures Poor sex.
    The above four reasons will cause the network to block after the automatic Stenter printing. Specific analysis of daily problems encountered in production, choose the correct solution. This article introduces several solutions for reference.
    From the two aspects of ink production and use, how to solve the problem of network blocking after printing. The closure of the net caused by the excessively large ink particles can be solved from ink making. The first method is to strictly control the ink particle size. As far as modern ink production technology is concerned, it is not difficult to solve the problem of larger ink particles.
    During full-automatic Stenter printing, the viscosity of the ink increases due to the volatilization of the solvent, and it becomes dry in an instant, clogging the screen (conjunctival film after drying), resulting in clogging. Especially when using evaporative drying ink, this phenomenon is more prominent. The evaporated ink needs to be dried with a solvent. Therefore, when printing on the fully automatic Stenter, you must choose an appropriate solvent to control the drying speed. At the same time, pay attention to the ventilation, temperature and humidity of the production workshop. Choosing ink should consider climate factors. Usually use quick-drying ink in winter, late-drying ink in summer, and dry ink in between in spring and autumn. In addition, the post desiccant can also be used for fine line printing. If the filter is clogged when using the desiccant later, you must switch to another type of ink. It is not common to use oxidation method to dry the ink. However, if it is used too much in summer, it will be blocked. Therefore, it is generally necessary to control the use in summer.
    With the use of two-component activated ink, since the ink itself dries slowly, there is almost no clogging, but occasional clogging occurs. This is because the viscosity of the ink increases after the solvent evaporates, causing sticking. At this time, you can add an appropriate amount of late desiccant to the ink for dilution to prevent ink clogging.
    In fully automatic Stenter printing, the ink viscosity increases, causing the screen to block. As the solvent evaporates, the viscosity of the ink on the screen increases, causing the screen to block. If the printing area is large, the screen ink consumption will be more, and the screen will be less blocked. If the drawing surface is small and the ink consumed on the screen is less, the ink will go back and forth on the screen longer. As the ink moves on the silk screen many times, the viscosity gradually increases, which easily causes the silk screen to seal. At this time, it is necessary to frequently replace the new ink to prevent the occurrence of clogging.
    Flat Screen Printer ink has poor fluency, and it will cause ink clogging if it does not pass through the ink screen. The solution to this problem is to reduce ink viscosity and improve ink fluidity.