Mauritius-Based TROPIC KNITS Enjoys A Shot In The Arm From BRÜCKNER

Machinery and Technology

Mauritius-Based TROPIC KNITS Enjoys A Shot In The Arm From BRÜCKNER

Recently the Mauritius-based TROPIC KNITS group’s local ally, CDL KNITS resolved a major technology constraint with the help of Germany’s BRÜCKNER Textile Technologies. BRÜCKNER enabled them to replace an operating system comprising three finishing machines with a single machine without compromise on quality.

The TROPIC KNIT Group gave its testimony on how it queried different companies with the technical problem till it approached BRÜCKNER, which eventually hand-held them till the end in resolving the issue in an efficient and professional manner.

The story began like this. At Forest Side in Mauritius, CDL KNITS is producing every day approximately 17 tons of knitted fabric out of which 80% is assigned for TROPIC KNITS which converts them into garments. The rest is exported to South Africa in open-width fabric form.

Since quite a long time the operations and finishing team of CDL KNITS has been looking for leaner production processes that would lead to further savings in terms of resources and energy for the company. During ITMA 2015 in Milan the first ideas were discussed with different textile machine manufacturers and very soon their thoughts became a mature and solid concept. CDL KNITS manufactures a variety of cotton fabric, cotton blends and viscose. The finishing line they operated at that time comprised a relaxation dryer, a stenter and a compactor. The intention was to replace these three finishing machines by only one line without compromises regarding quality. In the beginning this seemed to be rather unrealistic on a technical point of view.

The German textile machinery producer kept their ears open to the concept. An intense exchange of insights began, new ideas were discussed and several fabric trials were performed in the BRÜCKNER Technology Centre in Leonberg, Germany. Together, a completely new machine concept has been developed which CDL bought for their production site in Mauritius. Most important was the mutual trust which has developed during the phase of conceptual design between BRÜCKNER and CDL KNITS. The excellent assistance by the complete BRÜCKNER team, the technological advice and the positive results of the trials in Leonberg were in the end convincing and crucial for the purchase decision.

The new BRÜCKNER line for knitted fabric which will in future replace CDL's three finishing machines is a special design: a relaxation dryer with pre-arranged stentering zone. Scroll rollers in the entry of the line provide for the spreading of the fabric and skew straightening rollers for the reduction of spirality. After that the fabric is pinned on precisely directly behind a special selvedge spreading unit, so that the selvedge waste is later reduced to a minimum. A non-lub vertical transport chain, developed particularly for knitted fabric, transports the fabric through a ten-meter-long stentering zone. It is provided with a selvedge gumming unit, comprising several IR dryers and further hot air dryers for a complete drying of the gummed selvedges. Depending on the process and the fabric quality it is possible to operate with up to 60% overfeed and a wet overstretching of 40% and more.

At the end of the stentering zone a selvedge cutting device is installed. With minimum tension the fabric is then fed on to a specially coated transport belt leading into the 4-zone relaxation dryer. The fabric is dried with an optimized air control concept and it is relaxed due to the tumble-like movement so that the residual shrinkage is reduced to a minimum. The individually adjustable air flow in the dryer and the wet spreading and shrinkage in the stentering zone allows to influence the quality features such as shrinkage, fabric width and fabric surface to the optimum. The curling of edges in the dryer is prevented by a systematic and selective arrangement of the circulating air. This new technology allows to save previously required expensive process steps.

BRÜCKNER’s Technical Director for Mechanical Design, who is an expert for the finishing of knitted fabric at the same time, wanted to assure himself that the recently developed concept is performing perfectly. He visited CDL KNITS in Mauritius directly after commissioning of the new line. Together with the customer he made tests with different fabrics and determined the optimum process parameters for each fabric quality. The operators were directly involved and correspondingly trained.

After a short time CDL could start the production and the results speak for themselves. The fabric quality is better than expected and the residual shrinkage as well as the spirality are for all fabric types less than 5%. CDL is already now saving about 40% of electrical and thermal energy compared to their previous process. But the biggest saving is definitely the significant reduced process time. Where previously 90 hours were required, is today 20 hours to achieve the same productivity. This gives enormous benefits regarding the delivery time.

But there are some more aspects which made CDL KNITS invest in a BRÜCKNER line. The state-of-the-art lines of the German machinery producer are very robust and durable. Spare parts and support are available for all machines, even if they are 20 or 30 years old. In addition the machines are produced 100% in BRÜCKNER's own plant in Tittmoning. Bavaria, in Germany and they are always tailor-made to the customer's needs. Furthermore BRÜCKNER attaches particular importance on an energy-efficient technology to save costs for their customers when operating the lines and to reduce simultaneously the consumption of resources.

The TROPIC KNITS Group located in Mauritius is with 3.000 employees one of the biggest producers of high-quality fine knit garments in the Indian Ocean. Well-known international brands from Europe, U.S. and South Africa are among the company's most important customers since many years.