Stretch Ceiling High Frequency Welding Machine Hf Welding Machine,Stretch Ceiling High Frequency Welding Machine,Stretch Ceiling Welding Machine,Pvc Ceiling Film Welding Machine Hangzhou Xiaoshan Wanfeng Mechanical & Electrical Equipment Factory , https://www.wanfengmachinery.com
Mechanical rewetting method
The basic structure is the same as the dampening device in printing. The fountain roller rotates to transfer the water to the rewetting roller. The remoistening roller transfers the water evenly to the back of the paper (adhesive on the front). The rewetting roll can be rotated forward or reverse. The entire device can be infinitely variable to adjust the amount of moisture regain on the bottom sheet. The mechanical moisture rejuvenation device is simple in structure, low in cost, and easy to adjust and install. The disadvantage is that when the speed of the coating machine changes, the speed of the remoistening device does not change, so the phenomenon of uneven rewetting amount is caused. In particular, when the coater changes paper or stops, there is a phenomenon of water flow, which affects the quality of the finished product.
Steam rewetting method
A row of nozzles is used to evenly spray the water vapor on the back of the paper, and the steam is evenly distributed along the running direction of the paper. The paper absorbs moisture to achieve the purpose of rewetting, and changes the amount of back steam by changing the amount of steam injected. Steam rewetting is an advanced method of rewetting. When the speed of the coater changes, the amount of steam can be adjusted by a computer to avoid the disadvantages of the mechanical rewetting method. However, the device is expensive and suitable for high-grade machinery. Use when producing high-grade hair products.
Commonly used bottom paper rewetting methods and characteristics in sticker manufacturing
There are two commonly used rewetting methods for adhesive backing, namely mechanical rewetting and steam rewetting.