Corrugated board adhesive mechanism

Normal > Adhesives are essential for making the corrugated board into an integral structure. Adhesives (glues) not only affect the production efficiency of corrugated board, but also have a great influence on the quality of corrugated paper. It plays an important role. Therefore, here I would like to briefly review the history of the development of corrugated board adhesives.

Normal > First, history of corrugated cardboard adhesive development

The oldest corrugated paperboard adhesive was sodium silicate. Sodium silicate, also known as water glass, is a very viscous liquid. Its properties generally vary with the ratio of the total molecular weight of silica and sodium oxide. Usually, a ratio of 3 : 1 to 4 : 1 is mostly used .

Normal > Corrugated cardboard bonded with sodium silicate has several advantages over corrugated cardboard bonded with starch. For example, the carton has a high compressive strength, and the shoulder formed by the glue line has a high water resistance.

Normal, but its fatal disadvantage is that it is easy to cause so-called "alkali stain" on the surface of corrugated paper, causing the printed surface to be contaminated, thereby significantly reducing the commercial value of corrugated boxes. The cause of alkali stains is due to the fact that sodium silicate is decomposed by water after absorption of moisture, and the separation of alkali causes deterioration of paper and ink. This change is exacerbated in particular in high-humidity climates. Due to this fatal flaw of sodium silicate, people started to improve on the one hand, and on the other hand, devoted themselves to the development of new adhesives. Of course, the development of new adhesives is also aimed at improving the production efficiency of corrugated board.

Normal > The development of semi-chemical pulp and the appearance of kraft paper, it was announced that the era of yellow core paper made from wheat straw as the main raw material has come to an end. This new type of noodle paper makes corrugated cardboard move toward high speed and wide width.

Normal > In 1956 , starch was first introduced into Japan as a binder for corrugated paper, which laid the foundation for the development of modern corrugated paper industry. In this process of transformation, the machinery for producing starch pastes with good performance in agitation has provided a great impetus for the development of the corrugated paper industry in the world.

Normal > two, starch

Normal > Starch is a high-molecular substance produced by carbon dioxide, water and light energy in plants. Usually we call this reaction "photosynthesis".

Normal > The plant itself also consumes a portion of the starch, but it is primarily stored as a chlorophyll and a nutrient source for photosynthesis that are needed to form the next generation of plants. Although starch is found everywhere in plants, most of it is found in seeds and rhizomes.

Normal > starch can be classified as follows:

Normal >nnecttype="custom" o:connectlocs="21600,0;0,10800;21600,21600" textboxrect="13963,@4,21600,@5">Overground starch                   Collected from seeds             Such as corn starch, wheat starch

Normal > underground starch           Collecting roots such as cassava starch and sweet potato starch from roots

In addition, starch can be divided into pure starch and chemically treated starch.

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