Main way of tension control
The tension control method is generally divided into two types: open loop control mode and closed loop control mode. The open loop control is to directly drive the winding mechanism with an electric motor having a similar winding characteristic n = kD (n is the rotational speed, k is a constant, and D is the diameter of the winding roller) to obtain an approximate constant tension operation. The open loop control has poor randomness and low control precision. The closed loop tension control has two kinds of direct tension control and indirect tension control. In the actual production process, the volume is adjusted, that is, the tension is fed back, compared with the given tension, and then the difference is applied to the regulator to adjust the controlled object so that the output tension meets the actual demand. It is called direct tension closed-loop control. This method can eliminate the steady-state error without considering various compensations. The indirect tension control uses the motor speed-torque characteristic curve to control the torque to control the torque, so as to achieve the purpose of controlling the tension. This method requires dynamic and static compensation. Sometimes, in order to obtain more precise control performance, a composite tension control method is adopted, that is, the required control amount is first determined according to an indirect control algorithm, and various compensations are considered to make the indirect control as accurate as possible, and then the direct tension control is used for fine adjustment.
Slitting machine operation guide ---
4 operational requirements
4.2.1 When loading paper, it is necessary to standardize the operation. If there are products that do not meet the quality requirements, the products should be picked out and clearly marked, and feedback should be sent to the squad leader.
4.2.2 Before the official production, the crew must pass the start-up information to each other, and it is not allowed to stack debris that interferes with the operation around the machine. The captain (blocking vehicle) shall compare the trial production sample with the standard proof, and self-check the product size specification. After confirming the pass, sign the first proof, and the sample will be retained until the end of the project.
4.2.3 When cutting, it is necessary to see the product specifications and determine in advance whether the size of the slitting knife meets the product quality requirements.
4.2.4 Each group of products must be self-tested, and the quality requirements and production process control shall be carried out according to the “Product Printing Process Card”.
4.2.5 After each group of products has been cut, the product label is affixed to the self-test and the production record is filled. The products to be re-rolled are processed on the shift; the items to be treated or scrapped are labeled and transferred to the treated area or waste as required. Area. The label of each product must clearly and accurately indicate the current product status, quality or problems.
Domestic cutting machine development status and outlets ---
First, the status quo of domestic slitting machine
At present, the domestic use of the slitting machine is mainly divided into several stages, and the first stage is mainly used for the main line slitting as one slitting. One slitting is mainly provided to downstream deep processing enterprises, and the downstream customers are divided into secondary slitting or three slitting. The film making manufacturers of this meeting are mainly cut into one slitting, with the competition of film forming enterprises in recent years. Intense, in order to provide better services to downstream customers, film companies have also added a second cut. In one slitting, the most used brand is CommScope, followed by Atlas, and the Japanese slitter is rarely used in one slitting. With the rise of domestic equipment manufacturing industry in recent years, domestic slitting machines have a certain foothold in a slitting process. Of course, compared with foreign slitting machines, there is still a certain gap in domestic slitting machines. From the user's point of view, I personally think that there is a certain misunderstanding, mainly because of the lack of deep understanding of the slitter market. Everyone knows that there must be a performance price ratio when purchasing a piece of equipment. In fact, the performance and price ratio of the above mentioned brands are not necessarily the best. Some people in the United States have done such an experiment. The above-mentioned brand slitting machine is compared with the Japanese Knife cutting machine. When the same film material is cut, the result is that Japan's Kataoka wins, mainly in terms of stability and speed, speed reduction and non-stretching. Japan's Kataoka has shown superior quality and its price is lower than the above brands. Unfortunately, in the domestic film-making enterprises, no one slitting machine used Japan's Kataoka slitting machine. It is a pity that domestic companies have bought foreign second-rate equipment at the highest price. I have researched the US market. Japan's Kataoka has a high market share in the US market. I believe that with the increase in market demand and fierce competition, domestic companies will come out of this misunderstanding and re-recognize the market of slitting machines. Compared with the first slitting, the third slitting and the one slitting, the status quo of the domestic slitting machine is diversified. One slitting is mainly the importing equipment to play the leading role, while the secondary slitting and three slitting fields are in the field. The domestic market has its own magical powers, including Europe, Japan, and Taiwan. In recent years, the domestically produced slitting machines have gradually replaced the trend of foreign brands, resulting in the following results:
1. Foreign advanced cutting technology has gradually flowed to China;
2. The rise of domestic manufacturing;
3. Popularization of advanced control technology;
4, the low cost of manufacturing causes the price of the slitting machine to be low;
The above various reasons have jointly promoted the domestic film-making enterprises to choose domestic slitting machines. As time goes by, I believe that the domestic cutting opportunities become more mature and the performance is better.
Zhengzhou EAST IMPORT AND EXPORT co., ltd . ( a goulian group of company) a manufacturer and exporter for all kind of packaging machinery , like bopp tape coating machines, bopp tape slitting machines. Bopp tape core cutter, bopp tape core loader etc