For the bending phenomenon in the production of trademarks, the following measures can be taken

The printing industry in the modern printing industry develops from monochrome to six-color and eight-color. The efficiency has evolved from multi-process to one-step molding, integrating printing, cutting, embossing, bronzing, and laser.

In the process of mechatronics, a series of new problems will inevitably arise in production. Trademark bending is a quality problem often encountered in the production of one-shot molding. Trademark bending not only affects the appearance of the trademark, but also directly impairs the user's applicability to the computer, causing users to discontinue their use of the trademark.

How to effectively solve and control the occurrence of trademark bending in production is of great significance to improving product quality and satisfying users' needs.

From the test, it is known that under a certain pressure and temperature conditions, the greater the tensile force, the higher the temperature, the greater the deformation of the film.

In the process of one-step forming of gravure multi-color machine, the film is subjected to 20dan to 35dan tensile force, 25dan to 40dan pressure, drying temperature 60°C to 100°C, and after several times of printing and drying, stretching, and recovery, deformation occurs to varying degrees. , And in the printing, due to the application of ink, but also will cause the film surface lateral amplitude of the local and the positive and the outer side of the two different stretching, deformation, recovery, and thus appear in the finished product trademark bending phenomenon, especially the poor tension formation The quality of the film will be severely curved.

For the bending phenomenon in the production of trademarks, the following measures can be taken:

(a) film control

In order to reduce the bending of the trademark, in selecting the brand of printing film, it is necessary to reasonably select famous products with higher technical content, which can ensure the reliability of pp resin, the control of film thickness uniformity change is reliable, and the slitting and rewinding tension is uniform. Ensure that the surface condition and tension of the film are balanced, which is beneficial to printing and avoiding bending.

(b) Control of inks and solvents

In the printing process, since the ink is applied to one side of the film, the ink, resin, trademark pattern, and solvent are volatilized, which has different degrees of influence on the bending of the trademark. Under the premise of guaranteeing the pattern and color to meet the needs of users, the ink's origin, applied thickness, and choice of solvent should be compared. The ink must be selected for its strong solubility, good performance, and low susceptibility to sizing. The thickness is in the platemaking process according to product requirements. Net depth is generally not more than 35μm; the use of solvents must maintain a balanced mixture of solvents, that is not too volatile, but also at a certain temperature (usually does not exceed 80 °C), so that the product does not stick.

(III) Coordination of speed and pulling force

Under the condition that the pulling force is certain during the printing process, the higher the printing speed, the greater the degree of bending of the trademark; conversely, the printing speed is constant, the greater the pulling force, the greater the bending of the trademark. In the production of equipment to play the efficiency, can not reduce the speed to solve the problem of trademark bending, which must be a reasonable choice of tension parameters to solve quality problems. For example, in the running speed is 130m/min, the tension before the tension of 20dan, the rear tension of 35dan is a more ideal parameter, as for the choice of actual parameters, according to the printing effect adjustment.

(4) Influence of drying temperature and air volume

The higher the temperature inside the drying oven, the printing process has certain advantages, but the temperature is too high, the trademark bending phenomenon will appear, therefore, for the level of printing generally stable temperature at 55 °C ~ 90 °C, dry box inlet pressure and row The wind pressure must be balanced. If the air volume is too large, the shrinkage of the film is large and the trademark is severely curved.

(5) Effect of ink, printing pattern, solvent on trademark bending