Method of manufacturing paper for bottle labels

Details Method of manufacturing paper for bottle labels Method of manufacturing paper for bottle labels

1990-10-22

1993-05-11

Lusignan, Michael

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

427208, 427209, 427377, 427382, 427391, 428514, B32B 2308, B32B 2710

Patent

active

052099822

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The present invention relates to the manufacture of coated paper, and concerns in particular improvements aimed at enhancing the properties of the coated paper intended for producing bottle labels.
Labels for bottles used to contain drinks have to meet a certain number of criteria, which can be summarised briefly as follows:
1. The label media have to prove perfect labelling, ie have perfect adhesion to the bottles. Suitability for labelling is is defined by the loss of stiffness of the paper in the moist state, which is related to the speed of absorption of the water.
2. The label media have to be dimensionally stable over a large range of relative humidity so as to remain perfectly flat during the operations to which they are subjected.
3. The printing inks and surface lacquers have to develop the maximum amount of brightness: the penetration of the inks and lacquer into the medium has to be as low as possible.
4. The labels have to be non-flaking.
In addition, in order to protect the natural environment, the label medium has to be made as non-polluting as possible and, to this end, the labels have to have high resistance to chemical agents (caustic soda) in order not to pollute the washing baths, and they have to contain a proportion of free formaldehyde which is as low as possible, since free formaldehyde upsets the persons handling the labels and it deposits on the bottles traces which destroy the yeasts in the drinks.
Paper for labels consists of a fibrous medium, the front face of which carries a coating of material provided to permit printing, and the reverse face of which is covered with a coating slip designed to provide the labelling qualities. According the prior art, the labelling qualities are obtained by using, to cover the reverse face, a coating slip which is relatively impervious to water. The quantity of water absorbed by the paper is then usually of the order of 12 to 15 grams per square meter.
The performance of papers for labels produced according to the prior art can be summarised as follows:


______________________________________ Suitability for labelling 45% to 50% Loss of stiffness in the moist state Flatness range Maintaining flatness from 45% to 80% relative humidity. Adhesion of inks and lacquers 12 to 15 g/m.sup.2 Loss of material after soaking in a caustic soda solution Concentration of formaldehyde released 35 to 60 mg/m.sup.2 during handling ______________________________________
It transpires that the characteristics of the papers currently on the market for producing labels are hardly ever entirely suitable for the severe conditions of use in the brewing and soft drinks industries.


SUMMARY OF THE INVENTION

The invention relates to a method of manufacturing coated paper which improves remarkably the performance and labelling qualities of the coated paper for labels.
The invention also relates to a technique for manufacturing coated paper which reduces pollution in the washing baths very markedly, following in line with changes in the European standards in this regard.
Finally, the invention relates to a new generation of coated label paper which meets the requirements of breweries.
More particularly, the invention relates to improvements in the manufacture of coated paper, which lie essentially in three directions:
1) the composition of the coating slip applied to the reverse face of the paper so as to improve its suitability for labelling,
2) the composition of the coating applied to the front face of the paper so as to improve the adhesion of the inks and reduce pollution in the washing baths,
3) the process of manufacturing the paper so as to confer on the labels the desired dimensional stability.
The details of the techniques according to the invention are set out in the claims.


DESCRIPTION OF THE DRAWINGS

FIG. 1 is a simplified general diagram of an example of a papermaking machine utilising the method of the invention.
FIG. 2 is a diagram showing a typical water absorption curve for a paper produced in accordance with th

REFERENCES:
patent: 3578493 (1971-05-01), Smith
patent: 3853594 (1974-12-01), Moroff et al.
patent: 4112192 (1978-09-01), Vreeland
patent: 4317849 (1982-03-01), Ogura et al.
patent: 4370389 (1983-01-01), Ogura et al.
patent: 4515833 (1985-05-01), Nojima et al.
patent: 4900583 (1990-02-01), Hirabayashi et al.

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