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Dimensioning, Weighing and Scanning (DWS) System

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Dimensioning, Weighing & Scanning HOW TO SELECT DWS SYSTEM FOR YOU?
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Page 1: Dimensioning, Weighing and Scanning (DWS) System

Dimensioning, Weighing & ScanningHOW TO SELECT DWS SYSTEM FOR YOU?

Page 2: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

2Main Components of a DWS

07-Feb-2017

Page 3: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

3Typical 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

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Page 4: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

4What 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

ShapeRecord 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 package condition

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Page 5: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

5

Determining Which Solution to Use

THINGS TO CONSIDER

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Page 6: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

6Ask 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?

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Page 7: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

7Static DWS vs dynamic DWS

Static DWS

Dynamic DWS

Without Manual Intervention

Can be configured to stop if parcel missing vital info

Can send signal to sorter to divert package for manual check or re-sort

Require Manual Operation

Lower cost, simple processing

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Page 8: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

8Singulated flow and Mass flow

Singulated FlowRequires a certain

distance between objects

Suitable for Parcels

Mass flowObjects are not evenly

spaced

Objects often side by side or touching

Not possible to capture weight data

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Page 9: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

9Conveyable 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

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Page 10: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

10Regular vs. Irregular Dimensioning

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Page 11: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

11Measuring 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

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Page 12: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

12Throughput

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.

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Vineet Govani | Project Analyst

13

Building a DWS Solution

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Vineet Govani | Project Analyst

14

Dimensioning OPTIONS TO CONSIDER

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Page 15: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

15Dimensioning Considerations

Shape of the goods Number of measurement points Use of technology : Shadowing or reflective

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Page 16: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

16Measurement Points

The more points a device generates, the more precisely it can determine the dimensions of an object

More Points

More Precisio

n

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Page 17: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

17Positioning 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.

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Page 18: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

18Shadowing 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

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Page 19: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

19Light 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.

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Page 20: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

20Parallel 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.

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Page 21: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

21Recommendations

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Vineet Govani | Project Analyst

22

Weighing OPTIONS TO CONSIDER

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Vineet Govani | Project Analyst

23Considerations

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

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Vineet Govani | Project Analyst

24Weighing Technology

Strain-Gauge Load Cell Electromagnetic Force Restoration (EMFR)

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Page 25: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

25Weighing 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

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Page 26: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

26Recommendations

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27

Scanning OPTIONS TO CONSIDER

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Vineet Govani | Project Analyst

28Scanning 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

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Page 29: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

29Resolutions

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 mmLow resolution

Ability to read less dense barcode

Smaller reading areaMore readers

required to cover more area

Otherwise Need to choose higher

resolution0.30 mm

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Page 30: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

30Laser 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

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Page 31: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

31Image-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

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Page 32: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

322D Barcodes

Immerging Technology Ability to stop product counterfeiting More information coding ability Examples

QR Code Data Matrix PDF417

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Page 33: Dimensioning, Weighing and Scanning (DWS) System

Vineet Govani | Project Analyst

33Scanning Configuration

Overhead barcode reader Barcode reading tunnel

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Vineet Govani | Project Analyst

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If you cannot measure it, you cannot manage it

- PETER DRUCKER

Vineet Govani | Project Analyst | /VineetGovani

07-Feb-2017


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