Two kinds of test pressure sensitive adhesive initial adhesion small trick

The initial viscosity is the property of the pressure-sensitive adhesive sticking to the surface of the object under very light pressure, which has a great relationship with the practical performance of the pressure-sensitive adhesive tape. Production personnel are more accustomed to feel the initial viscosity of colloidal touch with their fingers, and even some enterprise production management cadres believe that the initial viscosity of the finger contact intuitive reality.

In fact, initial touch stickiness is not only too subjective, but also very unscientific. Skin roughness, temperature, grease, sweat trace, contact area, etc., will have a significant impact on the hand feel of initial finger contact stickiness. Initial contact stickiness may mislead adhesive users when they choose the right pressure sensitive adhesive.

Pressure sensitive adhesive coating enterprise laboratory test pressure sensitive adhesive initial viscosity commonly used methods are rolling ball test method and ring initial viscosity. Although the same pressure sensitive adhesive using these methods to obtain different values, but still can distinguish the relative bonding properties of different pressure sensitive adhesive.

1. Inclined plane rolling method

Inclined plane rolling ball method (J.Doow method) is simple and convenient. It is a very good test method for online QC inspection in the production site. It can play a very good control role in the quality control of production. Through this simple method, it is easy to measure the consistency of the coating on the format immediately after coating.

On a smooth surface with a slope of 30°, determine the maximum ball number of the ball stopping on the rubber surface by sliding down from the overpoint of the sliding distance with a standard test ball (made of GCr15 bearing steel, ball shape tolerance and surface roughness accuracy class 40 or above specified in GB/T 308).

2 Ring initial adhesion

The inclined plane ball rolling method has some defects, because the initial adhesive force measured by the inclined plane ball rolling method includes the adhesive force and the reaction force of the adhesive pushing away from the road of the rolling ball, and the two can not be distinguished. loop initial stick force (loop) has become the most reliable test method in recent years because it can obtain repeated and consistent data. Currently, most tape and label manufacturers only report the initial adhesive strength of the ring in their publicly available product information.

After the annular sample and the standard float glass test plate are completely contacted at a constant speed of 300mm/min, the instrument automatically reversely separates the annular sample and the test plate at a constant speed of 300mm/min. The maximum force generated is the initial ring adhesion of the tested sample.

Smprotectivefilm is also committed to the emulsion pressure sensitive adhesive research and development, production, sales of the company. We can effectively solve the problems that customers encounter in the use of glue because of different production equipment and technology.

We specialize in the production of protective film and pressure sensitive adhesive for many years, with our own R & D team. In the future, through continuous research and development and summing up experience, our glue can be applied to more product application fields.