Effect of Base Paper and Adhesive on Adhesion Strength of Corrugated Paperboard
2019-03-16 04:12:46
In the physical properties of the carton, the bond strength is a key indicator, and its value has a great influence on the carton production and the resistance of the finished carton. Many companies produce corrugated cartons, which often fail to meet the standard value of 5.88N/cm2 when they are tested for performance. This causes the batch of cartons to be unqualified; sometimes they are sent to users, and users are unable to carry them, causing economic losses. Now we will talk about the impact of the quality characteristics of paper materials and adhesives on the adhesive strength of the carton.
Carton production, the main material for all types of paper. According to weight, it can be divided into cardboard and corrugated paper. According to the origin, it can be divided into imported and domestic. According to the material, it can be divided into wood pulp paper, bamboo pulp paper, straw pulp paper, and waste paper back to papermaking.
The adhesives used are mainly scouring alkali and corn starch adhesives. Corn starch adhesives are divided into cold glue and hot glue. Corn starch can be formulated with many different qualities of adhesives due to different formulations. The quality properties of paper materials and adhesives can affect the adhesive strength of the carton.
Under normal circumstances, high adhesion and good permeability, the cardboard produced by the high bond strength, and vice versa, is poor. Cardboard produced from hot glue has better adhesiveness than cold glue and is more noticeable in winter. Paperboard using cornstarch as a binder has a higher adhesive fastness than brewing caustic soda, especially in areas with high humidity or after a certain period of storage. Paperboard produced from wood pulp is better than paperboard produced from other materials.
The effect of the quality characteristics of the paper on the adhesive strength of the panel is mainly the moisture content of the paper and the structural characteristics of the paper surface layer and the core layer. During the test, it was found that some paperboard layers and core layers were layered due to the process or the fiber tension was small, causing the paperboard to rise and the bond strength decreased. Therefore, when the moisture content of the paper is less than 14%, the paper absorbs glue quickly and penetrates well. The paperboard produced has good adhesive strength, but if the paper is too dry, it will absorb the moisture in the adhesive too quickly and the flow of the adhesive Sex, inhibit adhesive penetration, so that the adhesive can not penetrate to a sufficient depth, but reduce the cardboard fastness; on the contrary, the base paper is too wet, its moisture will hinder the fiber absorb adhesive, resulting in too little adhesive Corrugated cardboard adhesive layered, poor adhesive strength. In addition, the production of cardboard with different moisture content, will cause the cardboard after bonding warpage, resulting in the glue at the just bonding, low adhesive strength of the paperboard; some paperboard surface blisters from the layer, so that the entire cardboard adhesive strength decreased And the curved, surface-foamed paperboard is also difficult to print with a clear pattern on the printing slot machine.
The influence of the quality characteristics of paper raw materials on the adhesive strength of the paperboard also reflects the requirements on the quality characteristics of the adhesive. Different characteristics of the paper should be matched with the corresponding characteristics of the adhesive. It was found in the tests that the adhesiveness of cardboard was affected by the amount of corrugated and cardboard paper glue, the width of glue applied, and the depth of glue penetration. Some imported wood pulp papers have tight fiber and low density, good flowability and permeability, and high paperboard bond strength; while some home-made papers have loose fiber and low density, but fiber tension is better. Good penetration performance gel is selected; if fiber tension is poor, glue with good adhesion and permeability should be prepared to ensure adsorption and adhesion of glue and improve the adhesive strength of cardboard.
Source: China Carton Network
Carton production, the main material for all types of paper. According to weight, it can be divided into cardboard and corrugated paper. According to the origin, it can be divided into imported and domestic. According to the material, it can be divided into wood pulp paper, bamboo pulp paper, straw pulp paper, and waste paper back to papermaking.
The adhesives used are mainly scouring alkali and corn starch adhesives. Corn starch adhesives are divided into cold glue and hot glue. Corn starch can be formulated with many different qualities of adhesives due to different formulations. The quality properties of paper materials and adhesives can affect the adhesive strength of the carton.
Under normal circumstances, high adhesion and good permeability, the cardboard produced by the high bond strength, and vice versa, is poor. Cardboard produced from hot glue has better adhesiveness than cold glue and is more noticeable in winter. Paperboard using cornstarch as a binder has a higher adhesive fastness than brewing caustic soda, especially in areas with high humidity or after a certain period of storage. Paperboard produced from wood pulp is better than paperboard produced from other materials.
The effect of the quality characteristics of the paper on the adhesive strength of the panel is mainly the moisture content of the paper and the structural characteristics of the paper surface layer and the core layer. During the test, it was found that some paperboard layers and core layers were layered due to the process or the fiber tension was small, causing the paperboard to rise and the bond strength decreased. Therefore, when the moisture content of the paper is less than 14%, the paper absorbs glue quickly and penetrates well. The paperboard produced has good adhesive strength, but if the paper is too dry, it will absorb the moisture in the adhesive too quickly and the flow of the adhesive Sex, inhibit adhesive penetration, so that the adhesive can not penetrate to a sufficient depth, but reduce the cardboard fastness; on the contrary, the base paper is too wet, its moisture will hinder the fiber absorb adhesive, resulting in too little adhesive Corrugated cardboard adhesive layered, poor adhesive strength. In addition, the production of cardboard with different moisture content, will cause the cardboard after bonding warpage, resulting in the glue at the just bonding, low adhesive strength of the paperboard; some paperboard surface blisters from the layer, so that the entire cardboard adhesive strength decreased And the curved, surface-foamed paperboard is also difficult to print with a clear pattern on the printing slot machine.
The influence of the quality characteristics of paper raw materials on the adhesive strength of the paperboard also reflects the requirements on the quality characteristics of the adhesive. Different characteristics of the paper should be matched with the corresponding characteristics of the adhesive. It was found in the tests that the adhesiveness of cardboard was affected by the amount of corrugated and cardboard paper glue, the width of glue applied, and the depth of glue penetration. Some imported wood pulp papers have tight fiber and low density, good flowability and permeability, and high paperboard bond strength; while some home-made papers have loose fiber and low density, but fiber tension is better. Good penetration performance gel is selected; if fiber tension is poor, glue with good adhesion and permeability should be prepared to ensure adsorption and adhesion of glue and improve the adhesive strength of cardboard.
Source: China Carton Network
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