What is the Matte Gloss of Membrane?
1. What is the matte surface glossiness of the membrane?
The matt BOPP membrane should be a matte membrane. The surface gloss is very low and the visual sense is comfortable. The matte membrane is made by coextrusion of matte material and main material through biaxial stretching, not a coating.
As the surface characteristics of an object, gloss depends on the specular reflection ability of the surface to light. The so-called specular reflection refers to the reflection phenomenon where the reflection angle is equal to the incident angle. Glossiness is a physical quantity that evaluates the ability of a material's surface to reflect light under a set of geometrically specified conditions.
BOPP is the abbreviation of "Biaxially Oriented Polypropylene", that is, biaxially oriented polypropylene membrane. Its production is to make the melt of polymer polypropylene first into a sheet or thick membrane through a narrow and long head. The membrane is made by stretching in two vertical directions (longitudinal and transverse) and after proper cooling or heat treatment or special processing (such as corona, coating, etc.).
2. Why is the matte surface gloss of the membrane very low?
The optical properties of the BOPP membrane include surface gloss and haze. The gloss mainly reflects the flat length of the membrane surface and the reflection characteristics of light. The gloss and haze of the membrane generally have a tendency to deteriorate with time. This is mainly due to the migration of the core additives to the surface to form an aggregation layer, which changes the surface morphology of the membrane. The reflection and refraction characteristics of the membrane change. In addition, the recrystallization of the membrane in the middle of storage leads to changes in crystal form and crystal size, which may also have a certain effect on the optical properties of the membrane.
With the extension of the membrane storage time, the membrane gloss is gradually effective. In order to maintain a high gloss, the production process, the addition of additives, the storage temperature of the membrane and the humidity are very important for the gloss.
3. Membrane gloss detection
Linshang gloss measuring instrument can be used to detect the gloss of the membrane. The LS191 gloss measuring instrument is independently developed by Linshang Technology and has independent intellectual property rights and is in line with Chinese standard GB / T9754. The gloss measuring instrument adopts a 60 ° universal angle to meet the requirements of the first-class working machine in the JJG696 standard.
The measurement range of LS191 glossiness measuring instrument is 0-200GU, which is especially suitable for the gloss measurement of the surface of medium and low gloss type paints, inks, coatings, plastics, leather, ceramics, bamboo products, marble materials and other materials.
The above is the entire content of the membrane glossiness collected by the editor. Users who want to know more glossiness information can pay attention to our subsequent updates!