Warp Knitting | Caculation of Residual Yarn sheet on Warp Beam

In some cases on warp knitting fabric production practically ,we need to cut and replace the warp beam before the warp beams are finish and some yarn still remain wound up on the warp beams.The remain yarn sheet /residual yarn sheet on warp beam will be keep for next production order,for example due  a sudden change an order of fabric article or during the warping process warped yarn to much in the length or just for make a fabric samples or due another reason,whatever…

In this case we need to tape a yarn sheet on the warp beam,cut them  off and remove,however  we need  also to calculate  how many meters or kilo grams a yarn sheet remain on the warp beam for future used.Following are the formula to calculate the remain yarn sheet on warp beam for Warp Knitting.

First of all we need to know and to determine the current winding or the actual winding on warp beam,as follows ;

Read More

Warp Knitting | Metallic Yarn Used on Warp Knitting Fabric

Metallic yarns are by and large made from strips of a synthetic film, such as polyester, coated with metallic particles. In one more method, aluminum foil strips are sandwiched amid layers of film. Metallic yarns may also be made by twisting a strip of metal around a natural or man-made core yarn, producing a metal surface. It is made of thin film and supported by nylon or polyester or rayon yarn according to the type of yarn.
Metallic yarns start as rolls of films or laminations 30" or wider. These wide rolls are slit into narrow rolls 2" to 5" wide. These narrow rolls are gang slit across their whole width to micro widths from 1/128" (.0078") and wider and then taken up on plastic spools for shipment to textile mills. There is a rainbow of colors available from red, blue, green, etc. to gold and silver. Brilliant, reflective colors which add decorative patterns to fabrics.
Many metallic yarns  knitted into fashionable Raschel and Jacquard fabrics . For added variety, metallic yarns are twisted with other fibers such as wool, nylon, cotton and synthetic blends to construct yarns which add novelty effects to the end cloth or trim. They create all fabrics more eye-catching by adding sparkle.
At one time or another, metallic yarns have been used in just about every variety of textiles. Metallic Yarn is used in manufacturing knitting wears, knit and woven fabrics, embroideries, labels etc. Some end uses have been in automotive fabrics, television front fabrics, bath towels and face cloths, clerical vestments, bathing suits, hosiery, upholstery, hat bands, etc. Also in theatrical clothing, theatre back drops, doll clothing, banners and uniforms.

Read More

Warp Knitting | Active Pattern beam drive for high speed lace machines developed by Karl Mayer

Karl Mayer company has developed an active pattern beam drive for its high-speed lace machines which consists of a tension controlled yarn delivery system.This innovative control principle has already been used in practise by customers operating lace raschel machines. The system consist of a yarn-tension controlled yarn delivery system and can be use with all pattern beams.It is based on the tried and tested servo system,which has been successfully used for many years for driving the string bars.A new and improved version is currently being tested.The changes that are incorporated in this improved version relate to use of a new type of motor and replacing the existing friction control system with toothed wheel for power transmission.

Passive pattern yarn feed

In passive pattern yarn feed, the pattern beams run on ball bearings and are driven by the yarn let-off system at the knitting point, a solution which Karl Mayer says has its limitations at high machine speeds. Despite the use of balancing units, the physically induced mass inertia of the longitudinal shafts, together with the yarn warps which are arranged in a row, is said to be so great that it can cause 

Read More