BS ISO 03039:2010 pdf free download – Corrugated fibreboard – Determination of grammage of the component papers after separation.
The surfaces of the specimens taken from the corrugated fibeboard shall be free from any damage that may affect the test results.
The specimens should, if possible, be taken from non-printed and non-coated corrugated fibreboard.
8 Preparation of specimens
Using the cutting device (6.2), Cut the specimens to an area of 10 000 mm2 (100 cm2), corresponding to a diameter of 112,8 mm ± 0,5 mm or a square with sides of 100,0 mm ± 0.5 mm.
Cut enough specimens to enable the determination of grammage on five test peces from each component layer.
9 Procedure
9.1 Separation of component layers
Using the tank (6.1), immerse the specimens in tap water (5.1) long enough to cause the component layers of the corrugated fibreboard to separate spontaneously or with an extremely light pull. Make sure that the corrugated fibreboard remains submerged in the water, placing weights on the top of it if needed. When separating the component layers, care shall be taken to ensure that minimal fibres are removed from one surface and adhere to the adjoining one.
In the case of water-resistant adhesive, the water (5.1) can be heated to a temperature not exceeding 60 °C to accelerate the process and to separate corrugated fibreboard.
The suitable immersion time may vary from grade to grade, In most cases, a few minutes are sufficient, but for grades having highly water-resistant adhesive, the necessary immersion time may be several hours. If the immersion time is unknown, it is recommended that the suitable immersion time be evaluated before testing.
Blotters may be used to remove excess water, but not when drying.
9.2 Removal of the adhesive
By lightly scraping the surface, remove, while still wet, the adhesive showing on the surface of the component layer, which has not been absorbed by the sheet.
Complete removal of the absorbed adhesive cannot be expected. Removal of the fibres shall be avoided.
9.3 Drying of separated layers
Dry the separated layers, i.e. liners and fluting, in an oven at a temperature of 105°C ± 2 °C (6.3) to constant mass.
Avoid using blotters during drying since components in the adhesive, e.g. starch, might adhere to the fibres.
9.4 Conditioning of separated layers
After drying, condition the separated layers in accordance with ISO 187.
9.5 Preparation of test pieces
After cleaning and conditioning, flatten the fluting medium and re-cut the test pieces to an area of 10 000 mm2 (100 cm2) using the cutting device (6.2). It is not necessary to re-cut the liners.
A.1 General
In January 2009, an international round-robin was performed in which 18 laboratories from 10 different countries participated.
For a single wall of corrugated fibreboard, three laboratories did not report any results and two laboratories deviated from this International Standard which means that 13 laboratories have been included in the calculations.
For a triple wall of corrugated libreboard, four laboratories did not report any results and three laboratories deviated from this International Standard which means that 11 laboratories have been included in the calculations, with the exception of Fluting 1” with only 10.
Eight samples of single-wall corrugated board and one sample of triple-wall corrugated board were tested. For each sample, the grammage was determined on five test pieces from each component layer.
The process of separating corrugated boards into component layers may induce changes in the masses measured, associated with adhesives used, the properties of the layers, or other factors. These shifts, being related to the materials in the corrugated fibreboard, will probably occur in most laboratories and so are not explicitly included in the round-robin results. Thus, by its nature, this test is capable of only very limited accuracy for predicting the actual initial masses of the components used. However, it can give useful information concerning a general estimate of those masses.