With the continuous improvement of people's demand for knitted products and the gradual strengthening of the trend of textile industry towards refinement and deep processing, knitted products have gradually emerged the characteristics of underwear and garment fashion. The diversified demand of knitting products has brought huge development space for knitting machinery. At present, knitting machinery is developing in the direction of high speed, high efficiency, intelligence, high precision, diversification, differentiation, easy operation, easy maintenance, good stability and high reliability.
With the development of computer technology, the application of electronic jacquard technology in circular machine has been popularized gradually. At present, electronic jacquard technology has been successfully applied to single-sided jacquard circular machine, double-sided jacquard circular machine, and multi-functional jacquard circular machine, jacquard terry machine and other knitting equipment, which combines loop shifting, thread adjusting and lining. At the ITMA Asia CITME 2010 exhibition held recently, Quanzhou Baiyuan Machinery Co., Ltd. introduced a newly developed computer color selection control system with international level, which has the characteristics of accurate color selection time and higher stability. The direct hanging plate of the machine adopts a unique heart design, which effectively reduces the weaving resistance and reaches 22 rpm at high speed.
According to experts, at present, the computer control level of the operation control panel of many weft knitting machine is much higher than before. Users can input the production program with the help of PC, complete the preparation of knitting pattern, management and analysis of production data and other tasks. Some large circular machines can not only feed back the real-time operation parameters and fault analysis of the equipment, but also input some technical process and production instructions through the equipment control panel.
Although the rapid progress of the big round machine is amazing, there is still a certain gap between the precision of machining and the level of mechatronics of the domestic big round machine. These differences are mainly reflected in the fineness of the needle distance of the big round machine, the smooth running speed of the big diameter circular weft machine and the automatic control. At the same time, the domestic knitting equipment manufacturing industry still has a certain gap in the integration of imported advanced parts and domestic common parts. Sometimes, due to the unreasonable configuration of equipment parts, the quality of the whole machine will be affected, resulting in large vibration and noise during the operation of the equipment, which is prone to wear for a long time and affect the process position. In order to strengthen the international connection and aim at the international development front, the large circle machine manufacturing enterprises need to spend more time and energy in improving the automation level of domestic equipment.
Seamless underwear machine is more suitable for spinning
The stability of differentiation is still insufficient
Seamless underwear is more elastic and extensible than sewn clothes because it has no side seam and partition. It is especially suitable for weaving underwear and close fitting sportswear. This kind of clothing is favored by the majority of consumers because it has no sense of pressure and discomfort.
At present, the seamless underwear machine reflects the development trend of high mechatronics, increasing ability to adapt to various kinds of yarn, and more suitable for the computer-aided design function. Song Guangli, a professor of Textile College of Tianjin University of technology, told reporters that at this year's ITMA Asia CITME 2010 exhibition, the exhibitor of seamless underwear machine from abroad, SANTONI company of Italy, exhibited 4 machines in total, including 3 single-sided machines and one double-sided machine. Sm8tr1 is a single-sided loop shifting machine, with 3 needle selection points in each circuit, 2 needle selection points for 3-position needle selection knitting, and 1 needle selection point for needle selection and loop shifting, so as to weave single-sided loop shifting mesh products. Jumbo chroma is a product of Shengge company. It has 8 ways of yarn feeding, 2 needle selection points and 7 yarn feeding nozzles. In addition to the characteristics of other seamless underwear machines, high machine number is one of its characteristics. Its machine number is 40 needles / 25.4mm, which is the existing seamless underwear machine with high machine number. One double-sided machine on display is SM9 MFs, 8-way braiding and 4-way loop shifting, which can be converted into 12-way braiding when no loop shifting is needed. These devices have a high level of intelligence and automation.
The domestic seamless underwear machine represented by Ningbo Cixing, Wuxi Jinlong and other companies has reached the advanced level in the function of basic models. However, due to the late start, the accumulation of process technology is limited, and many links need to be further studied. Therefore, the domestic seamless underwear machine, whether in function, performance index or product stability, reliability, differentiation There is a certain gap in all aspects, and there are still many links to be improved.
Significant improvement in warp knitting machine manufacturing
The single product category needs to be changed
Composite materials, industrial fabrics and other warp knitting products with high added value bring great development opportunities for the warp knitting industry. At present, China's warp knitting machine manufacturing industry is stepping into a period of rapid development towards high-speed, high efficiency, high stability, high adaptability, energy conservation and environmental protection. The significant improvement of the manufacturing level of tricot warp knitting machine in China is mainly reflected in the improvement of the processing accuracy and the mechanical and electrical integration water, and the breakthrough in the design and manufacturing of some key parts of the equipment. For example, at the ITMA Asia CITME 2010 exhibition, Changzhou Runyuan warp knitting machinery Co., Ltd. launched a weft insertion system for biaxial warp knitting machine, which can insert 24 weft yarns at a time, and these weft yarns can be accurately positioned, with a high equipment speed of 1200 rpm. Fujian Xingang Textile Machinery Co., Ltd. exhibited hgm63 / 1 all computer carbon fiber multi bar jacquard warp knitting machine at this exhibition. Its jacquard system is controlled by piezoelectric ceramics, and its high speed reaches 600 rpm.
Generally speaking, in recent years, the manufacturing technology of warp knitting machine equipment in China has made great progress, but there is still a big gap between the reliability and stability of the equipment in high-speed operation and the advanced equipment in foreign countries. The domestic multi comb jacquard Raschel warp knitting machine has made remarkable progress in appearance and electrical control, but the machining accuracy and weaving speed of the equipment still need to be further improved. Relevant experts stressed that at present, the types of warp knitting machine products in China are relatively single, mainly focusing on Trico, multi row Raschel, double needle Raschel and other products, and the scope of application of these products is not very wide, which also needs to further refine product functions and expand the scope of application.
The efficiency of computerized flat knitting machine keeps improving
Lack of high function refinement development
Due to the increase of domestic labor cost and the continuous improvement of intelligent and automatic requirements for knitting equipment, the development and expansion of computerized flat knitting machine coincides with this trend. With the development of these years, the domestic production of computerized flat knitting machines has greatly exceeded that of the imported ones.
At present and in the future, the computerized flat knitting machine will always focus on the three main lines of improving production efficiency, product variety and product quality. According to song Guangli, Professor of Textile College of Tianjin University of technology, there were 19 manufacturers of computerized flat knitting machines in mainland China and Taiwan at the ITMA Asia CITME 2010 exhibition, 15 of which were mainly computerized jacquard flat knitting machines and 4 were mainly computerized collar machines. The exhibition's foreign exhibitors mainly include Stoll of Germany, Shimaji of Japan and steinger of Switzerland. Three new machines are on display in the company. Two of them are new intarsia (non dotted jacquard) flat knitting machines, the models are mach2sig123 SV and mach2sig123 SC respectively. On the basis of the original island precision series of computer flat knitting machines, they increase the guide track to 5, thus increasing the number of yarn nozzles to 40. Besides the beginning, waste and elastic yarn nozzles, 37-38 yarn nozzles can also be used for intarsia.
