Wuhan Handern Impregnation Machine
DATE：2020/6/2 8:26:48 / READ： / SOURCE：This station
Wuhan Handern Impregnation Machine
1. Paper ejection device
The paper ejection device usually includes a storage device or a moving splicer, so that the roll change does not need to stop the paper web. Newer machines tend to use mobile connectors. www.handern.com Breathable membrane equipment
2. Resin tank
The specifications and construction of the resin tank or soaking pan vary greatly. The large tray with several dip rollers can perform multiple controls when the paper web is in contact with the excess resin, thereby controlling the amount of resin suction. www.handern.com Breathable membrane equipment with such trays can generally handle even difficult to soak paper. On the other hand, the large amount of resin contained in the tray makes it insensitive to temperature or resin solids. Because the cost of resin is usually higher than that of paper, it is always desirable to minimize the amount of resin absorbed. However, when using a large plate for soaking, this usually causes at least a portion of the plate to be bypassed. Therefore, a compromise must be found. The new machines all use medium-sized resin tanks with relatively short immersion times. The adjustment of the immersion roller is often automatic in order to use the inertia from the online test system to maintain a stable resin uptake.
Maynard has proposed a new control system for resin tanks of dip cleaners. He suggested using a deeper slot between trees. The resin solution was added to the tank with a variable speed quantitative pump. The speed of the pump is coordinated with the speed of the paper web, so that the amount of resin added to the tray is exactly the amount the paper sheet takes away. If the paper web draws the required amount of resin, the liquid level in the tray will remain stable. If the paper web draws less than the required amount, the tray liquid level will rise, increasing the contact time between the paper and the resin, thereby increasing the resin suction the amount. If the amount of resin absorbed by the paper web is too much, the resin level will drop, thereby reducing the soaking time. Whether this method has been tried in commercial immersion machines is unknown. With the progress of online test devices with feedback control, the Maynard control system is still beneficial, but the necessity is not great. www.handern.com Breathable membrane equipment
3. Removal of excess resin
There are two main methods for removing excess resin from the surface of the paper web: a doctor blade and a squeeze roller, and the auxiliary knife can be as simple as a pair of angle irons arranged in contact with the paper web. Usually they are installed on a common rotatable bracket to control the pressure of the sharp knife against the paper sheet, because the pressure of the auxiliary knife against the paper web determines the initial nature of removing excess resin, the uniformity of the device to the web tension very sensitive. The paper strips with more stripes become loose and the lateral distribution of the resin is not good.
The squeezing roller is just a pair of steel rollers. After leaving the resin tank, the paper web passes through the nip of the roller, and the excess resin removed from the nip flows to the resin tank. Most squeeze rollers cannot apply sufficient compressive force to the paper web in order to remove much of the resin from the microporous structure of the paper web. Due to the attempt to increase the pressure of the nip to minimize the amount of resin absorption, it often happens that the roller bends to form a downward depression. www.handern.com The breathable film equipment clearly shows the phenomenon of high resin content in the middle part of the paper web and low resin content on both sides. The supplementary measure is to use a stiffer (large diameter) newspaper to break on the existing roller. More high school. Changing the paper sheet to reduce its saturation and reducing the resin absorption at a lower nip pressure may be the best solution to this problem. www.handern.com Breathable membrane equipment
In a few special cases, a completely different concept is used to control the amount of resin absorbed. This is the use of a reverse cloth removal machine to apply the required amount of resin to the paper. The zone adds resin quantitatively to the top coat. The rotation direction of the upper coating roller is opposite to the running direction of the paper sheet, which causes a wiping effect to ensure 100% resin transfer. www.handern.com Breathable membrane equipment This provides a means to control the amount of resin applied without involving any capillary properties of the paper sheet. But because all the resin must be applied to one side of the paper, its advantages are impaired. In recent years, there has been a tendency to use thick sheets of paper in order to make laminates with a small amount of paper sheets. This makes the disadvantages of single-sided coating increasingly obvious. The coating device of the coating machine is more precise and more expensive than the soaking and scraping or squeezing roller device. The second coater was used to add resin on the other side of the paper web, which was considered economically infeasible.
Another report of using a coater to apply resin to a paper web appeared in the United Kingdom during World War II. At that time, the resin applied to the paper machine was a massey in-machine coater coated with pigment. The dryer section of the paper machine is used to remove volatiles and cool the paper sheet. The finished product is used as a substitute for the aluminum plate of the aircraft shell.
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