[PPT] - The New Techpap NIR spectroscopy for Recycled Paper Bales PowerPoint Presentation

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Speaker: Didier Rech (Techpap) Authors: -Alain Cochaux (CTP – France)

Pascal Borel (CTP – France)
Guy Eymin Petot Tourtollet (CTP – France)
Didier Rech (Techpap)

The New Techpap NIR spectroscopy for Recycled Paper Bales Inspection

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2 8th Research Forum on Recycling, Niagara Falls , septembre 2007

Content of the presentation

General presentation of topic : problems & solutions

proposed

NIR spectroscopy
First trials in laboratory with NIR spectroscopy
Our industrial “recovered paper bales quality control”

sensors

First industrial trials in a mill : procedures & results
btained
Last industrial trials ... completed !

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1.1 Problem: recovered paper bales quality control

Increasing necessity for papermakers to control, at delivery,

recovered paper bales to ensure raw material quality & to pay the “right price”

Crucial interest for papermakers:
Measurement of moisture
Detection of possible presence of unusable materials

(metals, plastics, etc)

Distinction of different raw materials (paper / board) for

coherence with EN643 standard (1.04, 1.05 …)

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1.2 Current control procedures used

Generally speaking, they are :
Manually made
Very long and tiresome for operators

example: core sampling & traditional measurement of moisture

Limited objectivity

example: visual and/or manual controls

Consequence : Low efficiency so papermakers certainly

“lose money” …

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1.3 Solution proposed

To do that, we have developed a sensor based on a new

approach : Core-drilling device & Near Infra-Red (NIR) Spectroscopy

The objective of MONITOR project is to develop an easy-

to-use sensor:

Direct, rapid, objective, reliable, low cost
To control in recovered paper bales at delivery:

Moisture Unusable materials Grades

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2. NIR spectroscopy (in a few words …)
Already used since several years in different sectors (food processing,

chemicals, drugs …) to study the composition of samples (in particular: moisture measurement)

Papermaking sector: « emerging » and « promising » technology for

the future

Main advantages:
powerful technique to precisely study samples composition
no need of sample preparation
low price
very rapid (~ 50 ms / spectrum) ~ 200 measurements

in

nly 10 seconds

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Sample to study Reflected photons NIR Spectrometer Light source with 800nm < λ < 2500nm Composition of sample

Black Box = Multi-Linear statistics models (for predictions) obtained by “calibration / learning”

Black Box Black Box

2. NIR spectroscopy (in a few pictures …)

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Development of a “lab prototype” to simulate the behaviour of a coring

device used with our NIR equipment:

Displacement of sample Measurement window Fibre with measurement head

3. First trials in laboratory with NIR spectroscopy

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Samples (cores) were made with different moisture contents
For each core, we have done:
Acquisitions of NIR spectrum

(= inlet data X)

An accurate traditional

measurement of moisture: weighing, complete oven drying, re-weighing (= outlet data Y)

3.2 Moisture measurement

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12 % 18 % 13 % 20 % 10 % 8 % 7 %

Two « λ bands » seem interesting (around 1440 and 1940 nm) Dynamic more important around 1940 nm

Using statistical methods, several moisture prediction models were

built and tested :

Δ = « accuracy » of the prediction model = ± 0.35 %

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Same “procedure” as for moisture : making of cores with different compounds, building of prediction models ( = calibration) & tests

Choice of the different compounds to take into account

Aluminium (metals), 3 kinds of plastics (types:PP, PE, PET), paper and corrugated board

Acquisitions of core spectra with 100% of each compound (for

calibration)

Acquisitions of core spectra with blends of several compounds

(for tests)

8 “blends cores” were made with random %

3.3 Unusable & raw materials measurements

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Plastics Papers 1700 nm < λ < 2150 nm Water / Papers Using this « λ band », the system is able to distinguish the different compounds

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The first results obtained in lab with the NIR spectroscopy have allowed us to check the use and the discriminant capability of this approach for moisture and unusable materials that we would like to characterize (metals, plastics) vs raw materials (paper, board)

Conclusion of these first laboratory studies

Manufacture of an industrial prototype

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Two versions of the sensor have been developed:
An “embedded” version : to instrument an industrial coring device,

in order to perform direct control at delivery on trucks. This sensor was made to be fixed directly on the output pipe of any coring device.

A “transportable” version : less precise and efficient than the first
ne, but also much less expensive (no need of a coring device). This

sensor is hand-held and it has to be introduced in a hole done with a “simple” drill.

4. Our industrial sensor for “recovered paper bales

quality control”

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Spectrometer Light source power PC

control buttons

ptical fiber / power wire

Industrial rack coring device measurement head

control buttons screen

Synopsis of our complete sensor:

4.1 Our monitor sensor: “embedded” version

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pipe with optical fibre & power wire measurement head NIR light source reflected signal collection

The head is very light and very rigid
Total length of the head = 20 cm
Inside the head : optical device to optimize the light illumination

& the signal collection in the optical fibre

Some details about the measurement head …

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All the acquisition and data processing device is the same

as for the embedded version, except for the measurement head which is longer (1m), to be introduced directly in a hole done with any perforating device

4.2 Our MONITOR sensor: “transportable” version

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We have used an industrial coring device with our

MONITOR sensors for industrial trials programs

Trials have been carried out on ~ 70 bales

(= ~ 150 cores), and for each bale core:

NIR spectra acquisition
Recording of the corresponding outlet data wanted

Black Box

spectra Moisture EN643 classification (1.04 / 1.05) % of unusable / raw materials