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
  • D06C19/00—Breaking or softening of fabrics

Definitions

• This invention relates to fabric treatment machines and, more specifically, to machines in which the fabric is driven pneumatically against an impact member, such as, for example, a grille.
• document WO03023111A1 describes a fabric treatment machine where the fabric is transferred alternately between two tanks through the agency of a pneumatic duct.
• the fabric In front of the duct, at the first and second tanks, there are two respective grille structures against which the fabric is made to impact thanks to the kinetic energy imparted to it by the pneumatic duct.
• the impact surface should be as uniform as possible, that is to say, in practice, without any openings in it. This would, however, deviate the flow of the air used to drive the fabric against the impact surface, thereby reducing the force of collision.
• the hot air - which is normally used to drive and dry the fabric simultaneously - worsens the defects and makes them permanent.
• the main aim of this invention is therefore to provide a fabric treatment machine equipped with an impact member which is free of the above mentioned disadvantages. More specifically, this invention has for an aim to provide a grille which does not cause marking, creasing, abrasion, fraying and similar defects in the fabric following impact.
• a machine comprising at least one grille provided with a plurality of substantially flat slats, arranged horizontally in partly inclined, louvre-like fashion in such a way as to leave ample space for the passage of air while at the same time preventing the fabric from passing between them and being held back.
• the slat spacing allows the air to flow through the grille without substantial loss of speed, while the inclined louvre form constitutes a deflecting barrier for the fabric in practically the same way as if it were a single, inclined plane surface.
• the action of the horizontal grille slats on the fabric colliding with them across its full width has a uniform effect on the fabric and prevents the lengthwise markings (referred to as "rake” effect) from being formed on the fabric.
• FIG. 1 schematically shows a fabric treatment machine equipped with a grille according to the invention in a cross section through a vertical longitudinal plane;
• FIG. 3 shows a cross section through a vertical plane of a grille in a preferred embodiment of the invention.
• Figure 1 schematically illustrates by way of an example a part of a machine for the continuous treatment of a fabric in open-width form.
• the machine comprises a duct 10 - typically a Venturi tube - for pneumatically conveying the fabric T and a chamber 12 into which the duct 10 leads.
• a duct 10 typically a Venturi tube - for pneumatically conveying the fabric T and a chamber 12 into which the duct 10 leads.
• the chamber 12 is also equipped with a chute 14 for collecting the fabric on the bottom 16 and with an upper opening 18, behind the impact member 20, for discharging the conveying air.
• Recovery means for example a reel 19, are also provided for removing the fabric from the chamber 12 once treatment has been completed.
• a second chamber and a second impact member, typically present in continuous treatment machines, are not illustrated in Figure 1.
• the impact member is a grille 20 with a louvre structure, comprising a plurality of slats 22 extending horizontally in a direction transversal to the direction of motion of the fabric.
• the slats are substantially flat, of length not smaller than the width of the fabric, of height in the order of a few centimetres and mounted at an angle on a frame 24.
• the frame 24 When in use, the frame 24 is located with its upper part close to the exit of the duct 10 and its bottom part spaced from it so that the slats 22 are substantially vertical.
• Connecting means 26a and 26b are, however, provided for connecting the frame 24 to the walls of the chamber 12 and which allow varying the inclination of the frame and thus also the inclination of the slats.
• means of per se known type may also be provided for varying the inclination of the slats 22 relative to the frame 24.
• the fabric T is projected out of the duct 10, impacts the slats 22 of the louvre grille 20 uniformly across the full fabric width, slides downwards along the grille and falls to the bottom of the chamber 12.
• the conveying air flows through the spaces between the slats 22 to the other side of the grille and out of the chamber 12.
• Figure 3 illustrates a preferred embodiment of the invention in which the slats of the grille 200 are shaped and positioned in such way as to give the louvre structure a concave form, with the concavity facing the exit of the duct 10.
• the height, the horizontal spacing (i.e. distance between the vertical barycentric planes) and the vertical spacing (i.e. distance between the horizontal barycentric planes) of the upper slats 202 are smaller than the respective horizontal and vertical spacings of the bottom slats 204.
• the upper slats 202 are also preferably partly overlapped to prevent the fabric from penetrating between them.
• the latter embodiment just described is particularly effective for treating light fabrics because the concave configuration of the grille guarantees that the fabric correctly impacts the upper part of it, quickly slides down along the bottom part of it and then falls down on the chute and onto the bottom of the chamber. In particular, this prevents the air flow from driving the fabric through to the other side of the grille towards the opening 18.
• An impact member according to the invention can advantageously be used in all types of machines for the continuous and discontinuous treatment of fabrics in both open-width and rope form.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Vibration Dampers (AREA)
• Laminated Bodies (AREA)
• Treatments Of Macromolecular Shaped Articles (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46000174

Family Applications (1)

Country Status (7)

Cited By (3)

Families Citing this family (2)

Citations (4)

Family Cites Families (6)

• 2012
  • 2012-01-10 IT IT000001A patent/ITPO20120001A1/it unknown
• 2013
  • 2013-01-10 EP EP13705575.2A patent/EP2802706A1/en not_active Withdrawn
  • 2013-01-10 RU RU2014132698A patent/RU2014132698A/ru not_active Application Discontinuation
  • 2013-01-10 IN IN6532DEN2014 patent/IN2014DN06532A/en unknown
  • 2013-01-10 WO PCT/IB2013/050238 patent/WO2013105054A1/en not_active Ceased
  • 2013-01-10 CN CN201380013473.9A patent/CN104160082A/zh active Pending
  • 2013-01-10 BR BR112014017057A patent/BR112014017057A8/pt not_active Application Discontinuation

Patent Citations (4)

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