Foreign technology Voith papermaking technology 7VTT vacuum threading system High threading performance in Condat Realized problems Condat, since 1998, merged with Italy's Garda and Spain's Torras, became a member of Lecta Group, right and wrong. Manufacturer of groundwood coated paper. Its 89 production line, the paper machine network width 5.768m, paper width production capacity 566t/d. After running for 10 years, faced with some special problems: a poor efficiency of the forming part, the drying department of a large number of broken ends, longer cleaning time And unreliable slow threading process. Due to on-line coating on a paper machine, threading is particularly difficult. After completing the comprehensive threading analysis on the 89th production line, it was considered that the following problems existed: The threading of the No.1 coater was difficult and unstable, the paper ear was separated from the threading rope in the drying section, and the threading performance was different due to the operation team. Differently, manual threading endangers the safety of the operator and it takes too long to clean the sheet. The solution has proven its efficiency. The DuoShake shaker improves the forming quality by reducing the MD/CD ratio while also ensuring the presence of interference-free vibration. The DuoformerD top net former is arranged in the most suitable position, and the rice is designed with an efficient web suction box and a reverse dewatering blade. The JetFlowF device is a free-jet coating system that is easily integrated with the coating machine and replaces the coating roller. With the JetFlowF device, the web no longer passes through the nip (formed by the older twin rollers), reducing the risk of breakage. JetFlowF's design and control and coating color circulation system can effectively prevent the entry of contaminants and effectively reduce the cleaning work after the break. The optimization problem evaluation team of the threading solution determined a detailed and feasible optimization plan. The first problem is from the 52nd dryer to the final coater. Originally, the paper ears were conveyed to the nip of the paper rope through an air nozzle located under a pocket type doctor blade. This system is not working properly. When using air blow to feed the paper ear into the nip of the paper rope, the operator must operate on site. New solutions from the Voith TTG Department include the VTT vacuum pick-up belt system to stabilize the paper ears; eliminate double paper ears and provide a stable and controlled transfer to the press nip. The VTT vacuum pick-up belt is housed in a box structure that generates a large amount of vacuum. The vacuum pick-up belt also includes a built-in driver for efficient operation and space saving. This part of the transformation is carried out 8 weeks earlier than the main transformation, thus creating conditions for the operator to become familiar with the equipment and form an efficient operation. The second optimization area is from the dryer to the size press. Because the original system uses an air nozzle to transport the paper ear to the nip of the threading rope, the manual system is very unstable and the operator's safety is also threatened. Optimization solutions include: a paper ear drop tray, multi-point integrated VTT vacuum pick-up belt and paper ear surgery and new equipment (below) VTT vacuum pick-up system - streamline system improvements - extremely high pick-up performance Realized in Condat - Solve the problem of quantitative fluctuations in the longitudinal and transverse directions of coated paper Schwarza's pulp preparation system and the modified paper breaker of the paper machine Zulpich. The throw disk is mounted directly on the dryer blade, which allows the scanner and other equipment to operate. Paper ear breakers are used to effectively remove double paper ears. For example, the third part of the optimization of the VTT vacuum pick-up belt installed at the Condat paper mill is the 2R dryer to the first coater paper rope. Similarly, air nozzles were used in the original transport. When the air nozzle is located under the doctor blade, the system cannot operate normally and the operator's safety is also threatened. New solutions include the VTT vacuum pick-up belt, FlipTray, and paper ear breaker. In this section, the throwing disc moves the paper ear to the vacuum pick-up belt; here, the paper ear is continuously controlled and passed to the nip of the threading rope. The nip of the threading rope is also redeployed so that the better paper ear is conveyed to the threading rope of the coater. Optimize the effect of the transformation The result of the optimization transformation is obvious. Designed speed of 1200m/min, production capacity of 592t / d. Lead time is significantly reduced (such as 0), while the paper is optimized after the lead threading system is changed before and after the threading time of the machine's efficiency and productivity increased. The other advantages of the optimized retrofit are the elimination of double paper ears and the absence of manual intervention, which improves operator safety, reduces maintenance requirements, and saves space. Within 6 months after start-up, the total loss of time in the coater area was reduced by 35%. The optimisation improved the threading down time by 65%. Maize Peeling Machine,Maize Shelling Machine,Maize Thresher,Maize Thresher Machine Shuangfeng Nongjiabao Machinery Technology Co., Ltd , https://www.starchmakingmachine.com
Voith papermaking new technology and new equipment (below) VTT vacuum tail threading system
Voith papermaking new technology and new equipment (below) VTT vacuum tail threading system
Core Tip: Foreign technology Voith Paper's new technology 7VTT vacuum threading system's extremely high threading performance has achieved problems in Condat. Condat has become a member of the Lecta Group since 1998 when it merged with Italy's Garda and Spain's Torras.