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Laboratory analysis and quality control
Upon acceptance of the relevant estimate, paper manufacturers and
customers (packagers, printers, etc.) can send in samples of pulps,
papers and boards for analysis and characteristics assaying in contract
laboratories.
The IPE also carries out, on request, paper quality and behaviour
monitoring, acting as managers of the necessary human and technical
resources required and issuing its corresponding technical report.
Inter-laboratory Comparison and Lab. Apparatus
Calibration
The IPE is the Wholesale Laboratory for CEPI Laboratory Apparatus
Calibration service, and as such supplies Spanish and Portuguese
papermakers with additives, transformers and graphic agents and
samples for laboratory apparatus calibration, whose readings correspond
to the average from nearly 700 European laboratories.
AIMS
The final aim is to check the functioning and use of lab assaying
apparatus by sending out weekly paper or cardboard samples, whose
characteristics have already been determined.
The results are processed on a European scale and a report is drawn
up which enables the accuracy of any one machine to be compared
with the overall average.
The idea is not so much to obtain absolute ideals but rather a general
mean.
FREQUENCY
All laboratories in the Service receive samples twice a year. These
samples are accompanied by their approximate values (CEPI values).
SAMPLES
Each batch contains a certain number of individual sample pieces
depending on each assay and the number indicated in the relevant
standard for the test. Each sample corresponds to a different level
of values.
SUBSCRIPTION
The price of each assay includes two sample batches per year. IPE
member companies enjoy a special rate for this service.
The commitment undertaken by companies subscribing to this CEPI
Service includes the obligation to send the results of their measurements
of the samples to the IPE.
AVAILABLE ASSAYS
| Assay |
 |
Levels available |
|
Approximate values |
|
|
|
|
|
| Absorción de agua Cobb |
|
Nivel 1
Nivel 2 |
|
17 g/m
221 g/m2 |
| Alargamiento |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
3,5 %
1,3 %
1,5 %
5 % |
| Blancura ISO |
|
8 niveles |
|
% |
| Brillo |
|
Nivel 1
Nivel 2 |
|
55 %
80 % |
| Cóncora. CMT-30 |
|
Nivel 1
Nivel 2 |
|
230 N
430 N |
| Ensayo ECT |
|
Nivel 1
Nivel 2 |
|
7,85 kN/m
11,65 kN/m |
| Espesor |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
50 um
85 um
250 um
575 um |
| Espesor (cartón ondulado) |
|
Nivel 1
Nivel 2 |
|
4 um
7 um |
| Gramaje |
|
Nivel 1
Nivel 2
Nivel 3 |
|
53 g/m2
290 g/m2
2250 g/m2 |
| Humedad relativa |
|
hoja aluminio
hoja papel |
|
1,691
1,715 |
| Índice de desgote Schopper Riegler |
|
Nivel 1
Nivel 2
Nivel 3 |
|
20 ºSR
30 ºSR
55 ºSR |
| Lisura Bekk |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
50 s
150 s
300 s
1500 s |
| Opacidad |
|
4 niveles |
|
% |
| Permeabilidad al aire Bekk |
|
Nivel 1
Nivel 2
Nivel 3 |
|
10 s
15 s
80 s |
| Permeabilidad al aire Bendtsen |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
25 ml/min
150 ml/min
500 ml/min
1400 ml/min |
| Permeabilidad al aire Gurley |
|
Nivel 1
Nivel 2
Nivel 3 |
|
50 s/100ml
100 s/100ml
500 s/100ml |
| Permeabilidad al aire Schopper |
|
Nivel 1
Nivel 2
Nivel 3 |
|
20 ml
100 ml
180 ml |
| Resistencia a la compresión en anillo, RCT |
|
Nivel 1
Nivel 2
Nivel 3 |
|
0,8 kN/m
1,85 kN/m
3,7 kN/m |
| Resistencia a la compresión en columna corta,
SST |
|
Nivel 1
Nivel 2
Nivel 3 |
|
3 kN/m
6 kN/m
10 kN/m |
| Resistencia a la compresión en plano, FCT |
|
Nivel 1
Nivel 2 |
|
250 kPa
380 kPa |
| Resistencia a la penetración de tinta IGT |
|
MCs
Ka |
|
106 mm
137 mm |
| Resistencia a la perforación |
|
Nivel 1
Nivel 2 |
|
8 J
14 J |
| Resistencia a la tracción |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
1 kN/m
3,5 kN/m
7 kN/m
11,5 kN/m |
| Resistencia a la tracción tras inmersión
en agua |
|
Nivel 1
Nivel 2 |
|
50 N/m
75 N/m |
| Resistencia al arrancado IGT |
|
P
Ka |
|
0,36 m/s
1,67 m/s |
| Resistencia al desgarro |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
350 mN
1050 mN
1650 mN
2750 mN |
| Resistencia al desgarro Brecht-Imset |
|
Nivel 1
Nivel 2
Nivel 3 |
|
500 mNm/m
1000 mNm/m
1500 mNm/m |
| Resistencia al estallido (cartón ondulado) |
|
Nivel 1
Nivel 2 |
|
1400 kPa
2700 kPa |
| Resistencia al estallido (cartón) |
|
Nivel 2
Nivel 3
Nivel 4
Nivel 5 |
|
330 kPa
600 kPa
880 kPa
1350 kPa |
| Resistencia al estallido (papel) |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
150 kPa
330 kPa
600 kPa
880 kPa |
| Resistencia al estallido (Schopper) (papel) |
|
Nivel 1
Nivel 2
Nivel 3 |
|
150 kPa
330 kPa
600 kPa |
| Resistencia al plegado Köhler-Molin |
|
Nivel 1
Nivel 2 |
|
200 log10
2000 log10 |
| Resistencia al plegado Schopper |
|
Nivel 1
Nivel 2 |
|
2,6 log10
3,4 log10 |
| Rigidez Taber (15º, 10mm) |
|
Nivel 1
Nivel 2 |
|
40 mN
57 mN |
| Rigidez Taber (5º) |
|
Nivel 1
Nivel 2
Nivel 3 |
|
30 mN
100 mN
1300 mN |
| Rigidez Taber (7,5º y 15º) |
|
Nivel 1
Nivel 2
Nivel 3 |
|
80 mN
300 mN
1700 mN |
| Rigidez Kodak-Pathé |
|
Nivel 1
Nivel 2
Nivel 3
Nivel 4 |
|
0,4 mNm
7,0 mNm
25 mNm
390 mNm |
| Rugosidad Bendtsen |
|
Nivel 1
Nivel 2
Nivel 3 |
|
50 ml/min
250 ml/min
1300 ml/min |
| Rugosidad Print-surf |
|
Nivel 1
Nivel 2 |
|
4,30 um
6,10 um |
| Scott Internal Bond |
|
Nivel 1
Nivel 2
Nivel 3 |
|
250 J/m2
2400 J/m2
2450 J/m2 |
| Valores tristimulus |
|
8 niveles |
|
% |
|
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