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As the field of technical fabrics includes everything that is not traditional textile, a great variety of materials and production processes constitute this industry. Yet products made of such materials as synthetic leather, waterproof fabrics and many other technical fabrics, all require high quality raw material, manufactured by cost effective processes.

EVS provides the technical fabrics industry with Automatic Optical Inspection (AOI) systems suitable for quality inspection in the production processes of a variety of technical fabrics. A consistent set of hardware components is implemented in different processes by applying a different set of software parameters. Increased accuracy, improved quality and decreased labor and costs are some of the advantages.

Technical Fabrics Inspection Process

EVS systems can be installed in a variety of production processes. Speed varies between slow (10m/min) and fast (200m/min), in accordance with the fabric type. Typical detectable defect size is between 0.5mm – 1mm.

The hardware of the system is designed to fit line structure constrains (space limitations), in almost all existing production lines. Typical width of inspected fabric ranges between 1m and 4m.

Slit lines can be added prior to the inspection, when the width of each slit is known in advance and fixed. This enables the operator to monitor defects per slit, in the defects map, and also to issue a report per slit.

The typical inspection location is at the exit of each production line.

Detectable Defects:

  • Weaving defects
  • Finishing defects

System Modules:
EIP - Embedded Image Processing integrates the video camera with the image processing hardware and software. With the implementation of EIP the system reliability is increased, the number of components is reduced, the installation process becomes significantly easier and maintenance costs go down.

QST - Quick Style Tuning provides feedback from the video album review to the inspection instruction file. It enables rapid optimization of the inspection process of new styles, enhances detection while minimizing over-detection.

DSA - Defect Sorting Algorithm enables better definition of defect categories for an automatic sorting of defects into groups.

System Benefits:

  • Improved quality of final product
  • Reduced labor costs
  • Roll grading and fabric routing
  • Replacing final inspection of greige fabric
  • Collecting defects data
  • Central control on the finishing line operation
  • Simpler plant operation
  • Increased automation of plant

System Highlights:

  • Modular, compact, cost-effective
  • Centralized control over multiple inspection points
  • Inspection of images is performed inside smart cameras; central computer receives only inspection results
  • No special knowledge of image processing is required for system operation or maintenance
  • Operating System is based on Windows NT, with customized application programs
  • Fast Ethernet communication
  • Each camera is equipped with a Local Control Unit, capable of transmitting or receiving standard signals to or from external electronic devices

PCB

Advanced technologies implemented in the PCB industry demand highest quality and efficiency. Improving both yield and quality of parts and products are essential in this highly technological industry.
EVS brings to the PCB industry the world’s leading technology of Automated Optical Inspection (AOI). Our inspection and monitoring solutions can help PCB manufacturers to achieve products of the highest quality while reducing their production costs.

The Inspection Process

EVS AOI quality inspection systems for PCB materials can be implemented at various stages and processes:

  • Weaving to finish process of the glass fabric production, including:
    • Beam preparation of the warp (vertical) yarn before weaving
    • Sizing: coating the warp yarn with organic material for protection during the weaving process
    • Weaving process, with On Loom Inspection
    • De-sizing, removal of the organic material
    • Finishing process
  • Prepreg - coating the glass fabric with epoxy resin for lamination and isolation
  • Production of copper foil, to be used as the conductive layer in the PCB
  • CCL (Copper Clad Lamination), in addition to the Prepreg and copper foil

Inspection Process Produce

  • Inspect while processing
  • Detect surface defects
  • Detect broken filaments (for the glass fabric)
  • Display in real time defect maps & images
  • Display in real time defects data
  • Display in real time broken filament trends
  • Provide real time warning
  • Review inspection file on the production floor
  • Ship good quality rolls immediately
  • Quarantine defective rolls for Q.A. review

Detectable Defects

  • Detectable Defects on Glass Fabric
  • Dirt Contamination (DOP)
  • Warp Defects
  • Weft Defects
  • Woven in fluff
  • Selvage defects
  • Fuzz (knot)
  • Holes
  • Selvage, Unraveled edge
  • Broken picks
  • Broken Filaments
Defect Map Distribution and Defects Pictures: Broken Filamenta defects distribution Map
Detectable Defects on Prepreg

 

  • Fish eye
  • Broken fibers
  • Bulges
  • Sparkles
  • Spots Dirt

 

Detectable Defects on Copper Foil

  • Pinhole
  • Rust spot, Oxidation
  • Pits & Dent
  • Copper bulge
  • Wrinkle, Cresses
  • Scratch

Detectable Defects on CCL (Copper Clad Laminate)

  • Pits & Dents
  • Light depressions
  • Creases, Scratches
  • Spots, Sparkles
  • Copper bulges
  • Oxidations, Oil stains
  • Handling kinks
  • Plate marks

System Benefits

  • Continued fabric quality improvement
  • Substantial savings on inspection
  • Substantial savings on operational expenses
  • Consistent and reliable quality standards
  • Accurate and accessible quality data
  • Reduced customer claims
  • Automatic styles and parameter setting

System Highlights

  • Modular, compact, cost-effective
  • Centralized control over multiple inspection points
  • Inspection of images is performed inside smart cameras; central computer receives only inspection results
  • No special knowledge of image processing is required for system operation or maintenance
  • Operating System is based on Windows XP, with customized application programs
  • Fast Ethernet communication
  • Each camera is equipped with a Local Control Unit, capable of transmitting and receiving standard signals to or from external electronic devices

Plastic Film

The use of plastic film is constantly expanding in traditional as well as in new applications. Quality demands for the raw material are rising to new standards while producers are seeking cost effective ways to improve the production process.

EVS optical inspection systems automate quality inspection in the production of plastic films (BOPP, PP, PET, etc.). The line speed and width along with the different production lines, determine the system configuration. High resolution image capturing enables detecting defects of 0.1-0.2 mm.


The Inspection Process

EVS optical inspection systems for the plastic film industry are designed to meet the quality needs of the end user at the plastic film production line. Speed of the line varies between 200m/min and 500m/min, with a typical minimum defect size of 0.1mm – 0.2mm.

The system hardware is designed to fit line structure constrains (space limitations), in almost all existing production lines. Typical film width ranges between 3m and 8m, with numerous cameras, especially in the upper width ranges.

Slit lines can be added prior to the inspection, when the width of each slit is known in advance and fixed. This will enable the operator to monitor defects per slit in the defects map, and also to issue a report per slit.

The typical inspection location is at the exit, just before the roll windings.

Detectable Defects:

  • Orange skin
  • Insect contamination
  • Dirt contamination
  • Crater
  • Water spot
  • Cold stretch spot
  • Interface spot
  • Temperature spot
  • Snake skin
  • Pick off
  • Arrow end
  • Scratches

Typical Defects

 

Orange skin Water spot
Dirt contamination Arrow end
Shiny spot Snake skin
Cold stretch spot Interface

 


System Benefits:

  • Improved quality of final product
  • Reduced labor costs
  • Reduced running time and less repetitive defects
  • Collecting defects data
  • Central control on the line operation
  • Increased automation of plant


System Highlights:

  • Modular, compact, cost-effective
  • Centralized control over multiple inspection points
  • Inspection of images is performed inside smart cameras; central computer receives only inspection results
  • No special knowledge of image processing is required for system operation or maintenance
  • Operating System is based on Windows XP, with customized application programs
  • Fast Ethernet communication
  • Each camera is equipped with a Local Control Unit, capable of transmitting and receiving standard signals to or from external electronic devices

System Modules:

EIP - Embedded Image Processing integrates the video camera with the image processing hardware and software. With the implementation of EIP the system reliability is increased, the number of components is reduced, the installation process becomes significantly easier and the maintenance costs go down.

QST - Quick Style Tuning provides feedback from the video album review to the inspection instruction file. It enables rapid optimization of the inspection process of new styles, enhances the detection while minimizing over-detection.

DSA - Defect Sorting Algorithmenables better definition of defect categories for an automatic defect sorting into groups.