Abstract:

Objective Weft-knitted two-side transfer fabrics are regarded as complicated in technology and difficult in design. In order to achieve rapid design of weft-knitted two-side transfer fabrics, this paper studies and develops the weft-knitted two-side transfer fabric design system aiming to tackle the complicated design of weft-knitted two-side transfer fabrics.
Method The structure forming principle of weft-knitted two-side transfer fabric was analyzed, and the process design model of weft-knitted two-side transfer fabrics was established. The mathematical relationship between transfer pattern and process structure was described by using mathematical matrix and multi-dimensional process decomposition method. The multi-dimensional technological decomposition of the pattern effect was achieved on a graph, and the three-dimensional mathematical matrix was used to represent the artistic information for pattern grid and knitting pattern grid to assist the structural decomposition and the knit process. The pattern design process was simplified by means of algorithm and primitive mapping.
Results The schematic diagram of the established process design model was shown in the weft-knitted two-side transfer fabric with two jacquard and two loop shifting (Fig. 1). The process design model of the weft-knitted two-side transfer fabric involves multi-dimensional information. The pattern effect picture was divided into the front pattern and the reverse pattern and the two sides of the fabric were divided into the front and the reverse pattern. The three-dimensional matrix was used to describe the information. The color information in the cell was stored as the corresponding three-dimensional data. The fabric pattern was woven by A/B yarn system and two loop shifting systems, and the knitting design of yarn A, yarn B, needle cylinder loop shifting and needle disk loop shifting were established respectively. The corresponding color, position information c_k, t_k, flower width w, flower height h, and process flower height H were obtained. The structural break represented the breakdown information defining the color of the knitting intention diagram corresponding to the knitting action, and converted it into the process knitting diagram, specifically and intuitively expressing the knitting state of the yarn. Based on HTML5, ASP.NET framework, JavaScript and C# language, a process design system for weft-knitted two-side transfer fabrics was developed. The functions of the four modules in this paper were mainly achieved through organization filling and entity mapping. The organization filling process was to obtain the corresponding parameters through the user's drawing of the pattern design and knitting design. In the process knitting diagram, the left vertex was used as the reference point to fill the structure breakdown diagram from left to right and from top to bottom. Canvas's double-buffer technology was applied when drawing the process knitting diagram. The drawn elements were pasted on the canvas one by one based on the left vertex. The schematic diagram was shown in the design and development interface of weft-knitted two-side transfer fabric (Fig. 7).
Conclusion The product design method for weft-knitted two-sided transfer fabric is standardized and the process design process for weft-knitted two-sided transfer fabric is simplified. It has been proven that the design model can accurately describe the pattern and weave information, and can guide the process design of weft-knitted two-sided thansfer fabric. Based on the proposed system module, the design of the weft-knitted two-sided thansfer fabric design system has been completed from the design of the pattern intention to the realisation of the process weaving diagram, and it has been verified that the method can be applied to the process design of weft-knitted two-sided thansfer fabric. The problem of unstable speed and compatibility of the weft-knitted weft-knitted two-sided thansfer fabric design system due to the variability of the existing weft-knitted weft-knitted two-sided thansfer fabric design is solved, and the rapid and efficient development of weft-knitted weft-knitted two-sided thansfer fabric is achieved.

Key words: weft knitting, transfer fabric, design model, computer aided design, mathematical matrix