Pre-Crimped Weave Styles, How & Why
800.440.6374      Phone 360.835.7507      sales@wovenwire.com
 
     
 
All woven wire cloth or wire mesh should consist of wires that are crimped (providing  locking indentations at mesh crossings) that are necessary to maintain weave stability.
As the crimps align and inter-lock (nest) with each other, the center-to-center distance between adjacent wires is maintained. If the crimps are not formed correctly or if wire tension during the weaving process is not correctly maintained, the mesh structure will not be stable this results in a loosely woven mesh which is also referred to as a sleazy weave which by most standards is defective and subject to rejection.
The two basic methods of crimping:
#1.  If accomplished during the weaving process the wire is 'Loom Crimped' usually on a automatic loom that maintains precisely controlled tension of the Warp wires previously wound on the Beam as the loom Ram (also referred to as the Beater) As the looms ram as it reaches the end of travel (stroke) beats the Shute wire into position, thus producing the crimp indentations.
#2.  If accomplished in separate preliminary process prior to setting the Loom (usually manually operated) or threading up for operation.
There are two popular methods of pre-crimping the wire, they are
     A. Wheel Crimping, 
     B. Punch Crimping
Pre-Crimped  Wire cloth that has been crimped before weaving has extremely accurate openings and is woven much tighter than plain weave. It is typically preferred for vibrating screens and many other applications where sizing is critical.   Woven Wire Cloth, Double Weave  

Double Weave

Also referred to as "Over and Under" this weave is commonly used for screening operations in smaller openings. Used for medium to heavy wire in relation to screen opening size.

 

Punch Crimped Tooling for this type of set up is far less expensive than wheel crimping although the production rate is considerably slower than wheel crimping. This method involves a Punch Press fitted with single station tooling (one and one die) that produces the desired indentation at or near the bottom of the press stroke. Punch crimped wire is limited to the accuracy of the mechanism that feeds the wire into the tooling after the ram (punch) starts upward and the punch has cleared the die sufficiently to allow the crimped section to travel out of the forming area (punch and die) area. With the advent of modern servo-drive feeders, the accuracy is precise typically within +/- 0.0005" between centers.  Large wire diameters are usually punch crimped due to the high tonnage requirements required to form the high tensile strength, large cross section areas of High Carbon Steel and Oil Tempered Steel abrasion resistant wire which is utilized in Sand and Gravel Screens.   WIRE CLOTH SCALPING WEAVE   Scalping Weave

This weave is also referred to as "Lock-Crimp" due to the deep crimps which lock the wires in place. For light to medium wire in relation to screen opening size.

 

  Double Lock Crimped Weave   Double Lock Crimp

Single shoot oblong openings solve minor blinding problems for better flow.

 

  Flat Top Weave Wire Cloth   Flat-Top

Improves material flow with a much smoother, flatter surface than other weaves. Lock weave provides a longer wear life and maintains accurate openings.

 

  Long Opening Slotted Weave   Triple Shoot

Long openings will keep sticky or wet material flowing freely. Weave holds wires securely yet permits slight vibration to keep openings clear.

 

Wheel Crimping  Requires far more expensive tooling known as Crimping Wheels.   Wheel crimping is considerably faster than Punch Crimping. Wire diameters of 3/8" and below are typically processed on  Wheel Crimpers due to the much faster throughput speed and reliable accuracy of crimping wheels which are manufactured according to extremely close working tolerances.

See 'Crimp Wheels'

  intercrimp woven mesh  

Intermediate Crimp

When open area is important. Extra crimps between the intersections provide a more rigid weave and provide locking and tightness for light wires in relation to the large openings.

 

Common Loom Weaves

 
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Last modified: August 28, 2016