The main reason that affects the flatness of cardboard
1. There are different types and grades of paper inside. There are imported and domestic kraft paper, imitation kraft paper, corrugated paper, tea board paper, high strength corrugated paper. It's A, C, B, E. According to the poor quality of the paper, the paper is generally better than the inside paper
2. The main technical parameters of the paper are different. Considering the performance requirements of the carton or the cost reduction of the user, the paper requirements on the surface of the carton are different, usually:
(1) The amount of paper in the ground is different. Some tissues are larger than the inner paper, and some are smaller.
(2) Facial tissue has different water content in the inner paper. The moisture content of facial tissues is higher, but also less, than that of inner paper, depending on the humidity of suppliers, shipping inventory, and other environments.
(3) Paper and water content in the surface are different. First of all, the base of tissue paper is significant in the paper, the water content is greater than the paper or less than the paper; Secondly, the base weight of tissue paper is less than the inner paper, the water content is greater than the inner paper or less than the inner paper
3. The water content of the same batch of paper is different. The water content of one part of the paper is greater than the water content of the other part of the paper or tube paper.
4. The selection and adjustment of heating surface length (covering Angle) or heating surface length (covering Angle) of paper preheater are improper, and can not be adjusted arbitrarily. The former operation is improper, the latter equipment is limited, affect the preheating and drying effect.
5. The steam spray device cannot be used correctly or there is no spray device on the device, so the humidity of the paper cannot be increased arbitrarily.
6. Insufficient time to distribute moisture after preheating, or high environmental humidity, poor ventilation, production line speed is not appropriate. 7. The sizing amount of single-side corrugating machine and sizing machine is inappropriate and uneven, leading to uneven shrinkage of imported cardboard.
8. Insufficient and unstable steam pressure, damage of trap and other accessories or pipeline water discharge is not timely, leading to the preheater can not work normally and stably.
How to improve the flatness of corrugated board in carton packaging
We know that the flatness of corrugated cardboard is one of the important indicators in the carton production process, which is now directly related to the quality of printing, die-cutting or slotting and cutting corners. We understand that after the flatness of corrugated board is poor, they will produce a variety of arch corrugated board, mechanical adsorption printing is easy to jam when sent, resulting in cardboard scrap, forced to stop cleaning; We know that two-color printing or multi-color printing is prone to defects such as uneven inking, inaccurate color matching and overlapping edge colors. The dimensions of the slots on the print are shifted, and the bobbing cover of the carton overlaps or does not fit; Our die cutting feed can also cause adhesion and dimensional displacement, as these can lead to secondary waste of the front board or equipment damage, and force the machine to stop finishing. In short, poor flatness of cardboard will bring inconvenience to feed and lead to the increase of secondary waste in the production process of Zhengzhou carton factory.
In order to improve the flatness of corrugated board, ensure product quality and normal production efficiency, what are the improvement methods? Let the China packaging boxes supplier tell you.
The appearance of corrugated board with poor flatness
The appearance shape of corrugated board with poor flatness can be roughly divided into three types: transverse arch, longitudinal arch and arbitrary arch.
A transverse arch is an arch created in the direction of a ripple. Longitudinal arch refers to the arch of the board along the direction of the production line speed. Arbitrary arch refers to an arch that undulates in any direction. The arched surface of tissue paper is called positive arch, the arched surface of inner paper is called negative arch, and the undulating surface of inner paper is called positive and negative arch.
The main reason that affects the flatness of cardboard
1. There are different types and grades of paper inside. There are imported and domestic kraft paper, imitation kraft paper, corrugated paper, tea board paper, high strength corrugated paper. It's A, C, B, E. According to the poor quality of the paper, the paper is generally better than the inside paper
2. The main technical parameters of the paper are different. Considering the performance requirements of the carton or the cost reduction of the user, the paper requirements on the surface of the carton are different, usually:
(1) The amount of paper in the ground is different. Some tissues are larger than the inner paper, and some are smaller.
(2) Facial tissue has different water content in the inner paper. The moisture content of facial tissues is higher, but also less, than that of inner paper, depending on the humidity of suppliers, shipping inventory, and other environments.
(3) Paper and water content in the surface are different. First of all, the base of tissue paper is significant in the paper, the water content is greater than the paper or less than the paper; Secondly, the base weight of tissue paper is less than the inner paper, the water content is greater than the inner paper or less than the inner paper
3. The water content of the same batch of paper is different. The water content of one part of the paper is greater than the water content of the other part of the paper or tube paper.
4. The selection and adjustment of heating surface length (covering Angle) or heating surface length (covering Angle) of paper preheater are improper, and can not be adjusted arbitrarily. The former operation is improper, the latter equipment is limited, affect the preheating and drying effect.
5. The steam spray device cannot be used correctly or there is no spray device on the device, so the humidity of the paper cannot be increased arbitrarily.
6. Insufficient time to distribute moisture after preheating, or high environmental humidity, poor ventilation, production line speed is not appropriate. 7. The sizing amount of single-side corrugating machine and sizing machine is inappropriate and uneven, leading to uneven shrinkage of imported cardboard.
8. Insufficient and unstable steam pressure, damage of trap and other accessories or pipeline water discharge is not timely, leading to the preheater can not work normally and stably.
The main reason that affects the flatness of cardboard
1. There are different types and grades of paper inside. There are imported and domestic kraft paper, imitation kraft paper, corrugated paper, tea board paper, high strength corrugated paper. It's A, C, B, E. According to the poor quality of the paper, the paper is generally better than the inside paper
2. The main technical parameters of the paper are different. Considering the performance requirements of the carton or the cost reduction of the user, the paper requirements on the surface of the carton are different, usually:
(1) The amount of paper in the ground is different. Some tissues are larger than the inner paper, and some are smaller.
(2) Facial tissue has different water content in the inner paper. The moisture content of facial tissues is higher, but also less, than that of inner paper, depending on the humidity of suppliers, shipping inventory, and other environments.
(3) Paper and water content in the surface are different. First of all, the base of tissue paper is significant in the paper, the water content is greater than the paper or less than the paper; Secondly, the base weight of tissue paper is less than the inner paper, the water content is greater than the inner paper or less than the inner paper
3. The water content of the same batch of paper is different. The water content of one part of the paper is greater than the water content of the other part of the paper or tube paper.
4. The selection and adjustment of heating surface length (covering Angle) or heating surface length (covering Angle) of paper preheater are improper, and can not be adjusted arbitrarily. The former operation is improper, the latter equipment is limited, affect the preheating and drying effect.
5. The steam spray device cannot be used correctly or there is no spray device on the device, so the humidity of the paper cannot be increased arbitrarily.
6. Insufficient time to distribute moisture after preheating, or high environmental humidity, poor ventilation, production line speed is not appropriate. 7. The sizing amount of single-side corrugating machine and sizing machine is inappropriate and uneven, leading to uneven shrinkage of imported cardboard.
8. Insufficient and unstable steam pressure, damage of trap and other accessories or pipeline water discharge is not timely, leading to the preheater can not work normally and stably.