Single-stage Bi-Shrinkage concept impresses with yarn quality and efficiency

The Indian company Garden Silk Mills Pvt. Ltd. has adopted Barmag's new single-stage Bi-Shrinkage Yarn (BSY) spinning concept based on Wings FDY Plus eco. The systems, which have been in operation for about a year, deliver excellent yarn quality with very good productivity. With this investment, the company positions itself as a manufacturer of high-quality Bi-Shrinkage yarns produced at high efficiency.

Due to the increasing demand for specialty yarns, particularly in the Indian market, Garden Silk Mills Pvt. Ltd. retrofitted 24 positions of its Wings FDY polyester machines last year for the production of Bi-Shrinkage yarns. The decisive factor for the investment was Barmag's single-stage process. Based on Wings FDY Plus eco, this concept enables BSY production of up to 16 yarn ends at much higher speeds than two-stage BSY concepts.

Flexibility through fully separated processes

The solution developed by Barmag is characterised by a special process flow, which allows independent adjustment of yarn properties. After drawing, POY and FDY yarns are plied, intermingled and finally wound onto a bobbin as BSY. The special yarn path and low friction ensure high yarn evenness and high-quality tangle knots. The simple setup typical of Wings systems also ensures low waste rates in the BSY process.

Shashi Sharma, Chief Operating Officer and Group Project Head at Garden Silk Mills Pvt. Ltd., a long-standing Barmag customer, considers the retrofit a success: "The quality of the yarn is excellent. At the same time, we benefit from the efficiency advantages of the single-stage process. This gives us clear competitive advantages in a highly competitive market."

Bi-Shrinkage yarns as an alternative to textured yarn

BSY (Bi-Shrinkage Yarn), also known as ITY, combines POY and FDY with different shrinkage characteristics to create high bulk, texture and fabric handle. In Barmag's approach, instead of spinning POY and FDY separately and combining them in a subsequent texturing process, both yarns are produced and plied together directly in a single spinning process. The different properties of the two fibre types result in a yarn that closely resembles a textured yarn.

Bi-Shrinkage yarns are primarily used in the apparel and home textiles industries. Typical applications include curtains as well as chiffon, fleece, crinkle and pleated fabrics. Demand for these specialty yarns is currently growing strongly in India.