Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
  • D06B19/00—Treatment of textile materials by liquids, gases or vapours, not provided for in groups D06B1/00 - D06B17/00
  • D06B19/0088—Treatment of textile materials by liquids, gases or vapours, not provided for in groups D06B1/00 - D06B17/00 using a short bath ratio liquor
  • D06B19/0094—Treatment of textile materials by liquids, gases or vapours, not provided for in groups D06B1/00 - D06B17/00 using a short bath ratio liquor as a foam

Definitions

• the volume of foam applied to the sheet material and caused to permeate through it should be such that the foaming rate calculated from the weight of liquid initially applied in foamed form, the foaming rate of this foam and the liquid removed from the airpermeable sheet material is 10% to 80%, preferably 30% to 60% lower than the foaming rate of the foam originally applied. It is, of course, desirable to use as little liquid for the dewatering as possible. Depending on the characteristics of the sheet material to be dewatered (evenness of the surface, thickness, openness, amount of water to be removed, time available for permeation, pressure gradient available), a high, medium or low foaming rate may be more advantageous .
• This reduction of the actual foaming ratio may be increased by using a foam of low stability, a relatively low foaming rate and pressure gradients and foam flow-constraining conditions conductive to a relatively high degree of foam breakdown.
• APSM Air-permeable sheet material
• Formulation C 0.2 grams / liter of same surfactant
• Foam Volume Volume of foam (in ml) applied to surface of APSM before applying pressure gradient volume in ml per dm2.
• Sample 3 same treatment as for Sample 2, but foamed bath (same composition as padded bath) fed between the two layers of non-woven before squeezing.
• Non-woven substrates (rayon, entangles) were wetted in an aqueous bath containing small amounts (0.2 g / liter) of a non-ionic detergent. Control sample A was squeezed hard twice in sandwich form in the nip of a padding mangle. Control Sample A 'was squeezed lightly in sandwich form in the nip of a mangle.
• Sample B ' 1 was treated exactly as sample A', but after the light squeezing the foamed bath was sucked through the two layers by means of a vacuum slot.
• Sample B ' 2 was treated exactly as sample A', but after
• a very important step of the procedure is to insert foamed liquid between layers of wet air permeable sheet material, and then causing the foam to penetrate the sheet structure and remove liquid by passing the layers with foamed liquid sandwiched between the layers theough the nip of pressure rollers, ie rollers running in contact under adjustable pressure.
• the foam may be applied from one side, from both sides or between layers of the sheet material.
• the foamed liquid may be aqueous, containing small amounts of foaming agents, or it may contain agents such as foam stabilizers, agents destabilizing foams at elevated temperatures, finishing agents. It may be applied cold or have a temperature above room temperature. In certain cases non-aqueous liquids may be used.
• Known systems capable of removing water from wet material may be used not only may the application of the foam be integrated into the permeation step, but the permeation process may be integrated into the liquid elimination process.
• One may for instance apply foam between layers of multilayered sheet material (eg two, four or up to twenty layers of fabrics, the foam usually being applied between middle layers), and then the material passed through the nip of a mangle, forcing the foam into the structure and eliminating liquid in the same treatment.
• the FFCS in direct contact with the APSM determines predominantly the dewatering effect.
• Test 10a No. 18 as APSM No. 3 as FFCS Test 10b: No. 3 as FFCS No. 18 as APSM
• Test 10d No. 10 as APSM No. 18 as FFCS
• Test 10f No. 3 as FFCS No. 10 as FFCS
• APSM Tissue, Blotting Paper, Formulation A and C
• APSM Cotton Broadcloth, not mercerised Foam Blow Ratio: 60: 1
• the fabric was padded in caustic solution of mercerising strength (266 g NaOH / liter), then it was dewatered with foam (sucked through the fabric, with FFCS No. 56 between vacuum and APSM) repeatedly.
• the fabric was then treated in different ways to remove as much caustic as possible with a minimum of rinsing water.
• Sample 1 as dewatered one to five times with foam (formulation A, 300 ml / dm2 each time, no intermediate adding of water, blow ration 65: 1.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Filtering Materials (AREA)
• Air-Conditioning For Vehicles (AREA)

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Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

Country Status (11)

Cited By (3)

Families Citing this family (16)

Citations (3)

Family Cites Families (5)

• 1983
  • 1983-11-05 DE DE8383903512T patent/DE3375413D1/de not_active Expired
  • 1983-11-05 WO PCT/EP1983/000292 patent/WO1984001970A1/de not_active Ceased
  • 1983-11-05 AU AU22676/83A patent/AU557826B2/en not_active Ceased
  • 1983-11-05 EP EP83903512A patent/EP0124563B1/en not_active Expired
  • 1983-11-05 JP JP58503786A patent/JPS59502031A/ja active Granted
  • 1983-11-05 US US06/629,725 patent/US4606944A/en not_active Expired - Lifetime
  • 1983-11-11 IT IT68180/83A patent/IT1201061B/it active
  • 1983-11-11 PT PT77655A patent/PT77655B/pt not_active IP Right Cessation
  • 1983-11-14 CA CA000441025A patent/CA1236657A/en not_active Expired
• 1984
  • 1984-04-26 IN IN295/MAS/84A patent/IN160625B/en unknown
  • 1984-07-11 FI FI842786A patent/FI84085C/fi not_active IP Right Cessation

Patent Citations (3)

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