How To Make Self-adhesive Label Production Pass The Winter Smoothly?

Most of the adhesives in the glue layer of self-adhesive labels are organic polymers, which have a high dependence on temperature. In other words, their mechanical properties and viscoelasticity will be affected to a certain extent as the temperature of the external environment changes. Under normal circumstances, the self-adhesive label material manufacturer will choose to configure adhesives with different initial viscosity and persistent viscosity according to the actual application of the labeling temperature and the temperature of the product storage environment to adapt to different use environments and further satisfy customers. product demand.

Ambient temperature also has a great influence on printing. Especially in winter, in an environment without heating and air conditioning, the outside temperature is low, resulting in low temperatures in machinery, equipment, inks and printing materials. Taking offset printing as an example, the printing principle is to complete the ink transfer through the balance of water and ink, that is, the printing plate cylinder first contacts with the water roller, so that the non-graphic hydrophilic part of the printing plate is first watered, and then contacts the ink roller, so that The graphic part is inked, and then the ink of the image part on the printing plate is first transferred to the blanket, and the blanket roller transfers the ink image to the printing material under the action of the pressure roller. If the temperature of the machine equipment is low, it will seriously affect the transfer effect. At the same time, the ink temperature is low, which will lead to high viscosity and low fluidity of the ink, so that the ink cannot flow well between the ink rollers, resulting in poor ink transfer. , unevenness, resulting in uneven ink color on the printing surface, which in turn affects the image effect on the printing material and reduces the amount of printed matter.

First of all, we must fully understand the object being posted. Know whether the material of the sticker is paper, plastic, metal, or glass, etc.; know whether the surface of the sticker is flat or curved; know whether the environment where the sticker is placed is high or low temperature, whether there will be long-term sun exposure or rain Drenching, etc... These factors will not only affect the selection of self-adhesive label surface materials, but also affect the matching of adhesives. For example, certain foods, beverages or pharmaceuticals are filled and labeled at low temperature. Generally, the adhesive will harden at low temperature and reduce the viscosity. In order to avoid flying marks and falling marks due to the poor viscosity of the adhesive after pasting, it is necessary to use a self-adhesive label that meets the low temperature labeling requirements and has a high initial viscosity. Material.

Secondly, before printing, it is necessary to transport and store the self-adhesive materials in the production printing workshop 24 hours in advance, so that the temperature and humidity of the self-adhesive materials and the printing workshop can reach a balance state, and the temperature of the printing workshop can be kept at 18°C to 25°C. Humidity can be maintained at 50% to 65%..

One is to place a heater beside the equipment, which can be placed before die-cutting and at the waste discharge place to heat the surface of the material; the other is to add a heating plate or heating roller to the die-cutting equipment to increase the surface temperature of the material; The semi-finished products are placed in a warm environment for a period of time, so that the temperature of the self-adhesive label material rises to reduce the phenomenon of label drop; the fourth is to make full use of the previous process, such as products that need to be coated, heat the pre-coated film and Adhesive label surface paper sticking, give priority to die-cutting semi-finished products just after lamination, make full use of the residual temperature on the surface of semi-finished materials to improve the problem of label drop and waste discharge caused by low temperature of die-cutting.