Natural cold surface treatment for hollow glass items

Abstract

The invention relates to: a composition for the cold-end treatment of hollow glass articles, characterized in that it is an aqueous solution containing 0.01% to 1% by weight of solids of carnauba wax; a process for the cold-end treatment of hollow glass articles, comprising the spraying of this composition; and a hollow glass article thus obtained.

Claims

1. A composition consisting of: water, greater than 0% and at most 0.6% by weight of solids of rosin, 0.01% to 1% by weight of solids of carnauba wax, and 0.07% to 0.8% by weight of solids of wheat gluten.

2. The composition according to claim 1, consisting of said water, said solids of rosin, said wheat gluten, and from 0.04% to 1% by weight of said solids of carnauba wax.

3. The composition according to claim 1, consisting of said water, said solids of rosin, said wheat gluten, and 0.01% to 0.4% by weight of said solids of carnauba wax.

4. The composition according to claim 1, consisting of said water, said solids of rosin, said wheat gluten, and 0.07% to 1% by weight of said solids of carnauba wax.

5. The composition according to claim 1, consisting of said water, said solids of rosin, said wheat gluten, and 0.01% to 0.2% by weight of said solids of carnauba wax.

6. The composition according to claim 1, consisting of said water, said solids of rosin, said carnuba wax, and 0.1% to 0.8% by weight of said solids of wheat gluten.

7. The composition according to claim 1, consisting of said water, said solids of rosin, said carnuba wax, and 0.07% to 0.6% by weight of said solids of wheat gluten.

8. The composition according to claim 1, consisting of said water, said solids of rosin, said carnuba wax, and 0.15% to 0.8% by weight of said solids of wheat gluten.

9. The composition according to claim 1, consisting of said water, said solids of rosin, said carnuba wax, and 0.07% to 0.4% by weight of said solids of wheat gluten.

10. The composition of claim 1, consisting of said water, said solids of wheat gluten, said carnuba wax, and at least 0.1% by weight to 0.6% by weight of said solids of rosin.

11. The composition of claim 1, consisting of said water, said solids of wheat gluten, said carnuba wax, and at least 0.2% by weight to 0.6% by weight of said solids of rosin.

12. A process for cold-end treatment of a hollow glass article, the process comprising spraying the composition according to claim 1 on said hollow glass article.

13. A hollow glass article obtained by the process according to claim 12.

Description

EXAMPLE 1

(1) In this example, 75 cl, 300 g, Burgundy-type bottles resulting from one and the same production (same composition, same IS machine, simultaneous production) are treated.

(2) The sliding properties of the bottles with respect to one another are evaluated. In order to do this, two bottles are constrained in direct contact, side against side, on an inclinable plane, a third bottle is placed on the first two bottles, and the angle of inclination of the plane from which the third bottle begins to slide is measured.

(3) In the absence of any cold-end treatment, this angle is around 25.

(4) Irrespective of the cold-end treatment composition, it is possible to adjust the parameters of the treatment process so as to obtain a desired sliding angle: these parameters are, for example, the spraying flow rate and duration.

(5) In this example, use is exclusively made of aerial (overhead) spraying, the parameters of which are adjusted in order to obtain, each time, a sliding angle of 10.

(6) The scratch resistance of the bottles is evaluated according to the following protocol. Two bottles are held one on top of the other, their longitudinal axes in perpendicular position with respect to one another, with a force of 30 kg. The upper bottle is fixed, the lower bottle being moveable in translation back and forth along the bisection of the projection of the longitudinal axes of the two bottles, with a frequency of 2 Hz and an amplitude of 16 mm.

(7) In the examples of this application, all the cold-end treatment compositions are exclusively aqueous.

(8) In a first test, a bottle is cold-end treated with a 0.2% solid content polyethylene wax composition. 175 cycles are observed before scratching.

(9) In a second test, a bottle is cold-end treated with a 0.14% solids content carnauba wax composition. 148 cycles are observed before scratching. This value expresses a significant improvement in the scratch resistance.

(10) However, the adhesive bonding of labels is problematic: 100% easy unsticking of the label is observed 24 h after adhesive bonding, irrespective of the adhesive used.

EXAMPLE 2

(11) Via the cold-end treatment, a sliding angle of 10 is obtained.

(12) In a third test, the second test is reproduced by adding, to the treatment composition, an amount of wheat gluten equal to that of carnauba wax: the adhesive bonding of the label is good with casein, and poor with starch.

(13) In a fourth test, the second test is reproduced by adding, to the treatment composition, an amount of wheat gluten which is double that of carnauba wax: the adhesive bonding is excellent with casein and starch, the label tearing without unsticking 24 h after adhesive bonding.

(14) Wheat gluten is therefore a good auxiliary agent for improving the adhesive bonding of the labels.

EXAMPLE 3

(15) Via the cold-end treatment, a sliding angle of 10 is obtained.

(16) A batch of bottles similar to those described previously, but which nevertheless differ therefrom by several aspects of their manufacturing process, is treated here.

(17) The first test is reproduced, which constitutes the fifth test: the average scratch resistance is 10 cycles.

(18) The third test is reproduced, which constitutes the sixth test: the average scratch resistance is 19 cycles.

(19) In a seventh test, the sixth test is reproduced by adding, to the treatment composition, an amount of rosin that is triple that of carnauba wax on the one hand and of wheat gluten on the other hand: the average scratch resistance is 159 cycles.

(20) The effectiveness of rosin as an auxiliary agent for increasing the scratch resistance is thus established.

(21) This example also shows that the evaluation of the scratch resistance is relative to a given production of bottles. Thus, the values obtained in the first and third and respectively fifth and sixth tests are very different. Between the two batches of bottles, the hot-end treatments in particular differed.

EXAMPLE 4

(22) On another batch of bottles of the same type as mentioned previously, cold-end treatments are carried out so as to obtain, this time, a sliding angle of 15.

(23) The compositions below are expressed by weight of solids in water.

(24) In the eighth test, the treatment composition contains 0.14% of carnauba wax and 0.33% of rosin.

(25) The ninth, tenth and eleventh tests are obtained by adding, to this composition of the eighth test, 0.14%, respectively 0.22% and respectively 0.29% of wheat gluten.

(26) The performances are recorded in the table below.

(27) TABLE-US-00001 Number of Aqueous Aqueous cycles adhesive adhesive before bonding bonding Test scratching (starch) (casein) Eight 144 Poor Average Ninth 187 Poor Good Tenth 170 Average Good Eleventh 221 Good Good

(28) Poor adhesive bonding: 100% of the label becomes unstuck 24 h after the adhesive bonding.

(29) Average adhesive bonding: a portion of the label becomes unstuck.

(30) Good adhesive bonding: the label cannot be unstuck, it tears.

(31) The values obtained in this table corroborate, in all respects, the observations from the preceding examples.