Stretchers, supports and accessories

GENERAL OVERVIEW

Stretching system (Stretcher) provides the necessary tension to Fabric with a controlled movement of a roll called tension roll.

Keeping constant tension means:

  • Paper quality optimization.
  • Sheet breaks reduction.
  • Increase Fabric life.
  • Avoid Fabric overstretching.
  • Avoid drive roll slippage.
Stretcher is also in charge of long stroke roll displacement during Fabric change operations.

WIRE ARMS STRETCHERS, with rotational movement. Tension roll moves through arms operated by air rides or pneumatic cylinders. Wire tension is proportional to air pressure. Pneumatic system allows continuous tension compensation.

FELT STRETCHER FOR PRESS OR DRY END, with linear movement of tension roll support carriages. We can propose different stretcher design, SCREW JACK STRETCHER, where carriages move driven by a rotating screw jack system. PNEUMATIC COMPENSATED SCREW JACK STRETCHER where a couple of air cylinders keep constant tension.
Tension roll stroke is adapted to Wire/Felt length and to available room.
Models with electric, hydraulic or pneumatic motor.


CONTROLLING TENSION

he simplest way to control the tension is the manual system. The operator decides the tension and stretch or slack the Fabric by acting on the pushbutton (in the case of motor) or adjusting the air pressure (in the case of air rides or pneumatic cylinders). Operator is then requested to handy measure the tension.

Stretcher can be associated with a LOAD CELL, mounted on a fixed roll, which continuously detect a signal, transform it in actual tension and sent it to a display.
In the automatic control system the Load Cell send the signal to a regulator which adjust roll position to match pre-set tension value.


WIRE ARMS STRETCHER W-FS

  • Compact and reliable assembly.
  • Low maintenance.
  • Air rides, pneumatic cylinders or screw jacks.
  • Fully enclosed drive system
  • Stainless Steel executions.
  • Inner or outer wire roll systems.
  • Air ride stretchers together with torsion cross shaft allow the automatic tension control and are easy to install and use.
  • Screw jack stretchers, passing or rotating screw, and cross shaft, make sure of position repeatability. System can be associated with a Load Cell and stroke control by means of electric limit switch.
  • Built-in or bolted roll supports.
  • Models with electric, hydraulic or pneumatic motor.
  • Wire tension and wire roll movement systems are designed and executed in different models. Weingrill is available to tailor the design according to your needs
  • Accessories: Roll support bearing housings.

SCREW JACK STRETCHERS W-JS

  • Compact and reliable assembly.
  • Low maintenance.
  • Seam adjustment.
  • Fully enclosed drive system.
  • Stainless Steel or painted mild steel executions.
  • The motor drives the cross shaft and a couple of rotating screw jacks, two nuts move the trolleys carrying the tension roll supports.
  • The system has stroke control by means of electrical limit switches.
  • Seam line can be adjusted with a manual clutch.
  • Standard model with electric motor. Hydraulic or pneumatic motor are available on request.
  • Can be associated with a Load Cell.
  • Accessories: Roll support bearing housings.

LOAD CELL HOUSING W-LC

  • Simple and reliable system.
  • Tailored to application.
  • Installation on any machine position.
  • Stainless Steel or painted mild steel executions.
  • Fabric tension evaluation function of load on a fixed roll support.
  • The support is designed according to the selected Load Cell.
  • Models with Load Cell integrated in the roll support.
  • External cover in Stainless Steel.
  • Dimensions and drilling adaptable to existing roll support.
  • Mounting: Horizontal, Vertical or Inclined.
  • Typical Load Cell data:
    Accuracy 0.05%, Power 10 Vdc, Protection IP67, Cable 10m.
  • Execution:
    E – up to 40°C, in Stainless Steel.
    F – up t 130°C, in galvanized steel.
  • Accessories:
    - Load Cell power and transmitter unit.
    - Tension display.
    - Tension regulator and display.
    - Roll support bearing housing.

COMPENSATED STRETCHERS W-JSC

  • Compact and reliable assembly.
  • Low maintenance.
  • Pneumatic cylinders for tension compensation.
  • Seam adjustment.
  • Fully enclosed drive system.
  • Stainless Steel or painted mild steel executions.
  • The motor drives the cross shaft and a couple of rotating screw jacks, two nuts drive the trolleys carrying the tension roll supports.
  • A couple of pneumatic cylinders keep tension constant when Fabric length is varying.
  • The synchronization shaft ensure an uniform and coherent movement on both sides.
  • The system has stroke control by means of electrical limit switches. Seam line can be adjusted with a manual clutch.
  • Standard model with electric motor.
    Hydraulic or pneumatic motor are available on request.
  • Can be associated with a Load Cell used as tension display.
  • Accessories:
    Roll support bearing housing.

ACCESSORIES - BEARING SEATS W-S

  • Simple and reliable system.
  • Easy roll removal.
  • Stainless Steel or painted cast iron execution.
  • Model W-S-110 (W.20027):
    - cylindrical seat: diameters from 80 to 110 mm
    - spherical seat: diameters from 90 to 110 mm
  • Model W-S-155 (W.24445):
    - cylindrical seat: diameters from 110 to 160 mm
    - spherical seat: diameters from 120 to 160 mm
  • Model W-S-190 (W.20028):
    - cylindrical seat: diameters from 170 to 200 mm
    - spherical seat: diameters from 180 to 200 mm
  • Other sizes from electro welded are available