Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
  • D06C5/00—Shaping or stretching of tubular fabrics upon cores or internal frames

Definitions

• the invention relates to a method for eliminating the undesirable longitudinal distortion in textile, for example woven, shaved or knitted webs in tubular form or in open, wide-lying form made of natural fibers, in particular cotton, which may contain a proportion of synthetic fibers by the web in damp condition is controlled overstretched in the width direction. It also relates to devices for performing the method.
• Textile webs regardless of whether they are woven, rustled or knitted, leave the machine with internal tension.
• the later finishing stages such as washing, bleaching and dyeing, but above all the unavoidable, repeated loading and unloading of the machines under goods train, also stretch the web into Length and stretch the yarn. This forced wet deformation can currently neither be satisfactorily compensated for in the dryer nor in the steam calender and with reasonable effort.
• the yarn and fabric only relax completely when the finished garments are washed at home. The piece of laundry comes in.
• a stabilizing counter-deformation in the moist state is used, among other things.
• stretch the damp web in a controlled manner In doing so, it deforms in width and becomes shorter.
• the goods are compacted.
• the yarn is also relaxed during a subsequent tension-free drying process.
• the deliberately created excess width should jump to the normal size, the stretched yarn should relax and the length reduced by the compacting plus any additional machine drying shrinkage should be stabilized.
• the present invention is therefore based on the object of improving the method of the type mentioned at the outset such that residual shrinkage values in the range of 0% can be achieved with a simultaneously greater width and lower basis weight of the web.
• This object is achieved in that the web is overstretched in the heated state and that the lead is at least as large as the width expansion.
• Values between 5 and 50% are typical for woven goods, values between 10 and 80% for knitted goods and values up to 150% for knitted goods. To the latitude a corresponding advance in the longitudinal direction of the web must be set. Values that are larger than the values of the width expansion are preferred.
• the heating of the material web according to the invention can be carried out in various ways.
• One possibility is to pass the web through a hot bath before stretching.
• the moisture content of the web should be set between 20 and about 150%, the higher values being preferred. Sufficient moisture levels additionally improve the relaxation effect by heating.
• the moist web can also be heated with dry heat, in particular with infrared radiation or also with high-frequency energy. It is only necessary to ensure that the web is still sufficiently moist when the reaction temperature is exceeded.
• the web is preferably heated to temperatures between 50 ° and 100 ° C.
• the optimal temperature depends on the type of natural fibers - cotton or wool - and any synthetic fibers added.
• the process according to the invention is carried out at 50 ° C .; If it is pure cotton, the temperature can be safely increased to 100 ° C, which is the temperature of saturated steam.
• the material web is wide before it leaves Stretching device with certain qualities forced cooled.
• a chemically induced change in the molecular structure of the natural fibers by breaking up and reforming molecular chains is also responsible for the improved relaxation. Due to the forced cooling at the end of the spreading process, these chemical-physical processes are stopped immediately.
• a preferred device for carrying out the method according to the invention is that the compactor is equipped with a vapor deposition device. Any commercially available, perfectly functioning system is suitable as a compactor, which can be converted in a very simple manner to carry out the method according to the invention by attaching a saturated steam application device. Needle clips have proven to be the best for open, wide-lying goods.
• a conventional spreader is used for tubular goods, preferably with long jaws, in order to be able to treat the web as gently as possible.
• Another very simple device for carrying out the method according to the invention consists in equipping the body factor with an infrared heater.
• a heater can also be installed in the simplest way and retrofitted if necessary.
• the devices are provided with a cooling device, in particular a nozzle for cold air which extends over the entire width of the material web. This cooling air eliminates you at the same time Part of the moisture content of the web.
• Shredded terry towels with a basis weight of 300-330 g / m 2 and a nominal width of 1.62 m were first subjected to the usual wet treatment. The web then had a width of 1.48 m and a residual shrinkage value in the width direction of approx. 15%.
• the web was then gripped and stretched with pin clips, with a width expansion of approx. 30% and a lead of likewise 30%.
• the overstretched goods were steamed with saturated steam and then dried without tension in a conventional manner. It had a final width of 1.58 m.
• Reutlinger method i.e. H. washing and drying three times in household machines determines the properties of the web. This resulted in residual shrinkage values in length and width of less than 2%.
• Knitted tubular fabric with a basis weight of approx. 120 g / m 2 and a nominal width of 16.5 cm was first subjected to the usual wet treatment. The tube track then had a width of 16.5 cm.
• This tubular web was then stretched using a spreader with long guide jaws, with a width expansion of approx. 100% and a lead of likewise 100%.
• the overstretched goods were steamed at the widest point with saturated steam and then dried without tension in a conventional manner. It then had a final width of 16 cm.
• the residual shrinkage values were less than 0.8% in length and approx. 2% in width.
• a comparison of the measurement results shows that the method according to the invention leads to a significantly increased reduction in the internal stresses and at the same time to a significantly lower shrinkage, in particular in the width direction.
• the area stability is higher, the area weight is lower and thus fulfills the wishes of the manufacturer and supplier.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Knitting Of Fabric (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6245062

Family Applications (1)

Country Status (4)

Cited By (7)

Families Citing this family (3)

Citations (4)

Family Cites Families (4)

• 1984
  • 1984-09-11 DE DE19843433230 patent/DE3433230A1/de not_active Withdrawn
• 1985
  • 1985-04-20 AT AT85104803T patent/ATE41452T1/de not_active IP Right Cessation
  • 1985-04-20 EP EP85104803A patent/EP0180703B1/fr not_active Expired
  • 1985-04-20 DE DE8585104803T patent/DE3568809D1/de not_active Expired
  • 1985-09-09 JP JP60197870A patent/JPS6170066A/ja active Pending

Patent Citations (4)

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