How can you select perfect DWS system for your next project? What are the things you should know before selecting DWS system?

1. Dimensioning, Weighing &
Scanning
HOW TO SELECT DWS SYSTEM FOR YOU?

2. Main Components of a DWS
07-Feb-2017Vineet Govani | Project Analyst
2

3. Typical Uses of a DWS
 Verification of customer-declared weight and size data
 Check data against profile in customer database
 Compliance with Weights and Measures regulations
 Track and trace of shipments
 Check for missing parts in a shipment
07-Feb-2017Vineet Govani | Project Analyst
3

4. What Does a DWS Provide
Identification
(ID)
Capture item ID for correct sorting, tracking and allocation of
weight & size data
Weight Verify weight data for invoicing and load planning
Dimensions Verify measurement data for invoicing and load planning
Dimensional
Weight
Divide volume by a dimensional factor to determine an objects
dimensional weight
Billable Weight
Compare dimensional weight with actual weight to determine the
billable weight
Shape
Record shape data to reject an item that is too large to be sorted or
that require a surcharge because it is un-stackable.
Image
Take a picture of items measured for proof of correct invoicing and 07-Feb-2017Vineet Govani | Project Analyst
4

5. Determining
Which Solution to
Use
THINGS TO CONSIDER
07-Feb-2017Vineet Govani | Project Analyst
5

6. Ask yourself the following questions
 What type of objects are handled (parcels, pallets, etc.)?
 How many items are proccessed daily?
 How many items are procecessed during peak hours?
 What shape are the items that pass through the facility?
 What is the current level of automation?
 What is the speed of your sorting equipment?
 Where is there the possibility to further automate processes?
07-Feb-2017Vineet Govani | Project Analyst
6

7. Static DWS vs dynamic DWS
Static DWS Dynamic DWS
07-Feb-2017Vineet Govani | Project Analyst
7

8. Singulated flow and Mass flow
Singulated Flow
Requires a certain distance between
objects
Suitable for Parcels
Mass flow
Objects are not evenly spaced
Objects often side by side or touching
Not possible to capture weight data
07-Feb-2017Vineet Govani | Project Analyst
8

9. Conveyable vs Non-conveyable Objects
Easily handled by one personConveyable
•Easily placed on conveyor belt, table or into a vehicle
•Usually solid in shape
•Ride smoothly on a conveyor
Inconvenient for one person to handleNon-conveyable
•Examples include heavy boxes, tires, chests, bicycles or cans
Placed on a pallet or a skidPalletized
•Size, shape, weight or quantity make it impossible for
one person to handle
07-Feb-2017Vineet Govani | Project Analyst
9

10. Regular vs. Irregular Dimensioning
07-Feb-2017Vineet Govani | Project Analyst
10

11. Measuring Surface
 A measuring solution should provide sufficient accuracy on all surfaces
 Some technologies struggle to provide accurate measurement of items
 that are wrapped in shiny, reflective plastic, or
 that have a surface color that blends into the measuring background
07-Feb-2017Vineet Govani | Project Analyst
11

12. Throughput
 Throughput and conveyor speed are usually inversely proportional to weighing
accuracy.
 Sometimes a compromise has to be made between accuracy and conveyor
speed/throughput.
 In order to maintain high weighing accuracy at high throughput, a solution is to
divide the line over multiple scales or to implement a dual-scale solution.
 Dividing the line reduces the throughput over each weigh cell, while maintaining
constant throughput for the system.
07-Feb-2017Vineet Govani | Project Analyst
12

13. Building a DWS
Solution
07-Feb-2017Vineet Govani | Project Analyst
13

14. Dimensioning OPTIONS TO CONSIDER
07-Feb-2017Vineet Govani | Project Analyst
14

15. Dimensioning Considerations
 Shape of the goods
 Number of measurement points
 Use of technology : Shadowing or reflective
07-Feb-2017Vineet Govani | Project Analyst
15

16. Measurement Points
 The more points a device generates, the
more precisely it can determine the
dimensions of an object
More Points More Precision
07-Feb-2017Vineet Govani | Project Analyst
16

17. Positioning of Measurement Points
Parallel light beams
 Parallel beams see a more representative
view of an object’s characteristics
Angled beams
 Angled beams can easily be shadowed by
the edges of an object and the beam may
be blocked from seeing important details.
07-Feb-2017Vineet Govani | Project Analyst
17

18. Shadowing vs. Reflective Technology
Shadowing Technology
 The object interrupts a light path and a
shadow profile is observed by the device
 This method works with all objects
regardless of object surface
Reflective Technology
 Reflective devices use a type of radiation
that is reflected back from the object
 There are materials and surfaces that
absorb or reflect too much or too little
radiation to allow good measurements
07-Feb-2017Vineet Govani | Project Analyst
18

19. Light Curtain Technology
 Definition:
 A shadow parallel beam technology that uses hundreds of measuring
points on the top and the sides of an object.
 Advantage:
 Very small precision ranges can be obtained with this technology.
 Construction:
 Light curtains consist of arrays of infrared emitters and receivers.
 Infrared transmitters are placed on one side and transmit their
radiation to the receiver on the other side.
 Working:
 One transmitter and the corresponding receiver are active
simultaneously.
 As the object is moved through the device on conveyors, the
silhouettes are stored in a computer.
07-Feb-2017Vineet Govani | Project Analyst
19

20. Parallel Infrared Laser Rangefinder (PILAR)
Technology
 Definition:
 PILAR is a reflective parallel-beam technology, using modulated infrared light that measures thousands of points looking at the object from
the top
 Benefit:
 A very small precision range can be obtained with this technology.
 Working:
 Laser range-finders measure time of flight of light.
 The range-finder light path is scanned across the package with a polygon and a mirror arrangement.
 The light path is precisely parallel down to the package enabling it to recognise all details of the item being measured.
 A complete three-dimensional picture is formed.
 Limitation:
 Because this technology is reflective, some objects will not be measured.
 The technology is capable of determining whether an object reflects enough light to give correct results.
07-Feb-2017Vineet Govani | Project Analyst
20

21. Recommendations
07-Feb-2017Vineet Govani | Project Analyst
21

22. Weighing OPTIONS TO CONSIDER
07-Feb-2017Vineet Govani | Project Analyst
22

23. Considerations
 Speed and throughput
 Weighing resolution
 Maximum weight
 Accuracy
 Inversely depends on Speed/throughput
 Accuracy increases as conveyor speeds and
line throughput decrease
 Proportionally to Stability of object
 The more stable an item is during weighing,
the higher the accuracy
07-Feb-2017Vineet Govani | Project Analyst
23

24. Weighing Technology
Strain-Gauge Load Cell
Electromagnetic Force Restoration
(EMFR)
07-Feb-2017Vineet Govani | Project Analyst
24

25. Weighing Technology
Strain-Gauge Load Cell
 Suitable for non-legal-for-trade
applications
Electromagnetic Force Restoration
(EMFR)
 Suitable for legal-for-trade applications
where high accuracy is required at high
speed
07-Feb-2017Vineet Govani | Project Analyst
25

26. Recommendations
07-Feb-2017Vineet Govani | Project Analyst
26

27. Scanning OPTIONS TO CONSIDER
07-Feb-2017Vineet Govani | Project Analyst
27

28. Scanning Considerations
 Required minimum barcode resolution
 Height and length ratio of barcodes
 Placement of barcodes on a parcel or pallet
 Level of automation and possibility for manual intervention
07-Feb-2017Vineet Govani | Project Analyst
28

29. Resolutions
 Resolution: Minimum Width of line in
barcode or minimum spacing
 0.25mm
 0.30 mm
 0.38 mm
 The wider the spacing and thickness of the
lines, the higher the minimum resolution
should be.
0.25 mm
Low resolution
Ability to read less dense
barcode
Smaller reading area
More readers required to cover
more area
Otherwise Need to choose
higher resolution
0.30 mm
07-Feb-2017Vineet Govani | Project Analyst
29

30. Laser Based Barcode Scanner
- Easy to set up, connect and aim
- Read codes fast enough to accommodate high speeds
- Achieve a large scanning area and working range.
Limitation of read rate. It requires..
• Code quality ANSI grade B or higher
• Made of paper and not displayed in a plastic case
• Limited variation of the code skew and pitch angle (+/- 20°)
• Clear of straps or other objects
• Undamaged
07-Feb-2017Vineet Govani | Project Analyst
30

31. Image-Based Barcode Readers
- Higher read rate than laser scanners
- Able to read codes degraded by damage, orientation or distortion
- Analysis software reconstructs the data from any legible portion of
the image
- Cost
07-Feb-2017Vineet Govani | Project Analyst
31

32. 2D Barcodes
 Immerging Technology
 Ability to stop product counterfeiting
 More information coding ability
 Examples
 QR Code
 Data Matrix
 PDF417
07-Feb-2017Vineet Govani | Project Analyst
32

33. Scanning Configuration
Overhead barcode reader Barcode reading tunnel
07-Feb-2017Vineet Govani | Project Analyst
33

34. 07-Feb-2017Vineet Govani | Project Analyst
34

35. “
”
If you cannot measure it,
you cannot manage it
- PETER DRUCKER
Vineet Govani | Project Analyst | /VineetGovani
07-Feb-2017Vineet Govani | Project Analyst
35