Process for manufacturing surface-sealed hollow glass containers

Details Process for manufacturing surface-sealed hollow glass containers Process for manufacturing surface-sealed hollow glass containers

1999-03-19

2000-08-01

Dudash, Diana

Stock material or miscellaneous articles

Hollow or container type article

Glass, ceramic, or sintered, fused, fired, or calcined metal...

427314, 427387, 4273897, 4274072, 428 344, 428 346, 428429, B05D 302, B05D 300, B05D 724, B05D 136, B65D 2308

Patent

active

060963948

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process for producing surface-sealed hollow glass containers with the aid of special cold end coating compositions.
In the preparation process for hollow glass containers it is conventional to subject them to a surface treatment with which it is intended to cover external damage such as microcracks, and to minimize further damage. Thus immediately downstream of the production machine the so-called hot end coating is applied as a thin coat to the surface of the glass which is at from 500 to 550.degree. C. The compounds involved in this hot end coating are, in particular, chlorides of titanium and of tin. On the glass surfaces these compounds produce a titanium or tin dioxide layer, with the chlorine released passing into the waste gas. The hot end coating composition is applied by vaporization or spray atomization.
After hot end coating, the hollow glass containers pass through an annealing lehr in which they are cooled slowly in order to avoid harmful stresses.
At the discharge end of the annealing lehr, the hollow glass containers hot end coated beforehand are cold end coated by means of either vaporization or spray atomization. This produces the lubricity required for the remainder of the process in the glass plant and in the bottling plant.
The most common substances used as cold end coating agents are surfactants, fatty acid products, partial fatty acid esters, ester wax emulsions and various polyethylene dispersions.
A coating process in which hot end coating is carried out first and then a cold end coating composition comprising an olefin polymer, a polyurethane, a polystyrene or an alkylamine acetate is applied by spraying is known from DE-C 12 91 448. The bottles coated in this way, however, do not satisfy all requirements.
A certain degree of improvement in the scratch resistance is obtained if the polyethylene dispersion sprayed on as the cold end coating composition additionally comprises a silane (U.S. Pat. Nos. 3,438,801, 3,801,361, 3,873,352, 4,130,677, 4,374,879; EP-A-0 146 142). However, the level of properties is still not sufficient for all applications.
A further development of the prior art was to apply by spraying, as the cold end coating, first the solution or dispersion of a silane and then a further component such as, for example, a polyethylene dispersion. Reference is made here to U.S. Pat. Nos. 3,438,801, 4,130,677, 4,304,802, 5,567,235 (corresponding to WO-A-95/00259) and to EP-A-0 146 142 and EP-A-0 478 154.
It is known, furthermore, that cold end coating can also be carried out with a polysiloxane (U.S. Pat. No. 4,985,286; DE-A-31 44 457).
The coatings described do indeed ensure a good basic strength of the glass containers; however, this strength falls rapidly in the subsequent production process and in the subsequent use of the containers. Causes of this loss in strength are microscopic damage, which occurs unavoidably during shaping and during the subsequent transportation of the glass containers while being hot and which may act as a potential source of fracture depending on the level and situation of the damage and on the stress experienced by the containers.
One object of the present invention is to render such microscopic damage harmless actually in the course of the production process.
A further object is to render the hollow articles less sensitive to mechanical effects acting on the surface in the course of subsequent handling, i.e. on the conveyor belt and in the course of packaging, dispatch and filling. Another important aspect is that the hollow articles should have an improved durability in long-term use relative to the prior art. Thus, in particular, reusable bottles for carbonated drinks should still have a sufficiently high strength and, in particular, internal pressure resistance even after many returns.
In addition, the hollow glass containers should have improved chemical resistance, especially with respect to water and washing liquors.
It is the intention, furthermore, that the dry and wet scratch resistance should be increased

REFERENCES:
patent: 3734765 (1973-05-01), Russell et al.
patent: 3873352 (1975-03-01), Kitaj
patent: 3966531 (1976-06-01), Bargain
patent: 4053076 (1977-10-01), Vogel et al.
patent: 4130407 (1978-12-01), Ida
patent: 4130677 (1978-12-01), Huntsberger
patent: 4304802 (1981-12-01), Mosse et al.
patent: 4985286 (1991-01-01), Kurita et al.
patent: 5104692 (1992-04-01), Belmares
patent: 5567235 (1996-10-01), Carson et al.

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