Details the characteristics and production of four-layer corrugated board
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Four-layer corrugated cardboard structure
The four-layer corrugated board is coated with two layers of corrugated base paper with special properties of adhesive, so that the adhesive liquid penetrates between the fibers of the paper, changing the softness of the paper, and compounding the two layers of corrugated base paper. The ground is bonded together, rolled into a crucible under heating conditions, and then bonded to the surface layer cardboard to form a strong, stiff four-layer corrugated cardboard. The corrugated core type is bonded by double-layer core paper. , double-layer arched "cellular" structure formed by corrugated rolls. The double arches of the four-layer corrugated cardboard are still in the shape of ordinary corrugated - UV-shaped corrugated, which can be divided into 2A, 2B, 2C according to the corrugated model.
Performance of four-layer corrugated board
Reinforced corrugated cardboard, double arch corrugated cardboard, and UPS combined corrugated cardboard are all four-layer corrugated cardboard. The main difference is that the processing equipment is different. The four-layer corrugated board has high technical content and good performance, which helps to enrich the existing tile type and expand the market. The four-layer composite corrugated carton is suitable for the packaging of some products with high requirements for shockproof and compression resistance, such as the transportation and packaging of agricultural and sideline products such as vegetables and fruits. It can replace the existing standard five-layer corrugated box. Compared with the five-layer corrugated board, the four-layer corrugated board saves a layer of corrugated core paper, which can save more than 10% of the cost and reduce the cost of the carton.
In Japan, Europe and the United States and other countries and regions, the development and application of four-layer corrugated board has been quite common. It has only started in China in recent years. A few corrugated manufacturers in China have begun to introduce this new corrugated board manufacturing process, but it has not been promoted. application.
Functional expansion of four-layer corrugated cardboard
The function of the four-layer corrugated board has great expandability, such as the closed structure between the two-layer corrugated cardboard and the two-watt corrugated paper, which is convenient for filling special materials between the corrugated cardboard and expanding the performance of the corrugated cardboard. IF iron foil is a good filling material.
The corrugated box made of four layers of corrugated cardboard filled with IF iron foil can not only enhance the pressure resistance, breakage resistance and puncture resistance, but also has the functions of water resistance, moisture resistance, electrostatic shielding and electromagnetic shielding. It is especially suitable for packaging aquatic products, fruits and vegetables. , tea, electronic instruments, semiconductor products and electromechanical parts and other products.
We can also fill a lot of other materials to achieve a lot of special properties and enhance the functionality of the cardboard without affecting the appearance and printability of the carton.
Production of four-layer corrugated board
In China, the production of this kind of paperboard is mostly realized by introducing the whole production line. This is undoubtedly difficult for manufacturers who have already produced three-layer and five-layer corrugated board production lines and want to produce four-layer corrugated board in the near future. In response to this situation, Beijing First Airlines Wanyuan Packaging Machinery Co., Ltd. has successfully developed a device that can maximize the use of existing equipment without affecting the normal production of the original three- and five-layer corrugated board production lines. Adding a special gluing equipment (double arch coating machine to bond two core papers into composite corrugated core paper) can meet the requirements of producing four-layer corrugated board. Moreover, this newly added equipment is easy to install and place on site, and can form an independent production line without moving the ground position of each individual machine of the corrugated board production line.
The basic process of this special double-arch glue applicator is: after preheating, using rolling glue, after glue, glue, glue, shovel, glue, etc. In one step, two core papers are regularly bonded into a composite corrugated medium paper, and then introduced into a single-sided machine to form a composite corrugated cardboard.
Control technology for poor adhesion of four-layer corrugated cardboard
The corrugated four-layer corrugated cardboard has a layer of corrugated medium, and a layer of glue is applied between the two layers of corrugated paper to increase the hardness and thickness of the double-layer corrugated paper after drying, so it is thicker than the same thickness. The strength of the three-layer corrugated board has more than doubled.
1. Four-layer corrugated cardboard bonding points
(1) When the corrugated core paper is compounded, the coating glue will increase the moisture content of the corrugated core paper, and the adhesive will prevent the embrittlement of the corrugated core paper after drying, so the selection of water content is small, the permeability is slow, and it is easy to uniformly coat. Corrugated paper composite adhesives are critical.
(2) Under the premise of satisfying the bonding strength after compounding, the amount of sizing should be as small as possible.
(3) Before pressing the corrugated board, it is also important to control the humidity of the composite corrugated medium. Too much humidity not only affects the molding, but also causes degumming during compounding; if the humidity is too small, the peak will be embrittled and cracked when the corrugated sheet is bent.
(4) The corrugated type of four-layer corrugated board should be specially designed and designed according to the thickness of two layers of corrugated core paper and one layer of glue to produce the ideal corrugated board.
(5) When processing four layers of corrugated cardboard on a vacuum adsorption single-sided machine, it is necessary to adjust the adsorption system (position, clearance and air volume of the suction hood and corrugating roller) and the heating system; the composite corrugated medium paper requires higher The temperature can transfer heat to the peak and meet the gelatinization temperature requirements. The hardness of the thick corrugated medium will become larger, and it will be easy to get rid of the corrugating roller after molding, affecting the coating and compounding, and producing quality problems such as high and low smashing, collapse, degumming and "wood ear", so there must be sufficient adsorption air volume. And negative pressure and heating temperature, in order to ensure smooth coating after corrugated board molding.
2. Relationship between speed and cardboard quality
(1) The most stable and economical speed of the production line should be the ideal adjustment speed.
(2) The strength and humidity of the paper should be suitable for the speed of the vehicle.
(3) The fluctuation of the speed of the car will affect the humidity control of the paper. The more stable the vehicle speed, the more stable the humidity control of each layer of paper, and the more stable the quality of the paperboard. A good heating system is necessary at this time.