Glass manufacturing – With signal – indicator – inspection means – register – or recorder
Patent
1993-09-02
1996-01-02
Lacey, David L.
Glass manufacturing
With signal, indicator, inspection means, register, or recorder
65160, 65162, 65271, 65272, C03B 2900, G01D 960
Patent
active
054804671
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the heat treating of glassware and crystalware articles in a plane perpendicular to an axis of rotation and to a device implementing such a method.
2. Description of the Prior Art
The purpose of the heat treatment of glassware or crystalware articles in a plane perpendicular to an axis of rotation is generally to introduce transient mechanical stresses into the material making up the article, which is generally fragile, or to bring a part or the whole of the material making up the article, which material is situated in proximity to this plane, to within the plastic range.
An operation involving the action of transient stresses is called demoiling. In this case, the stresses are intended to cause or to propagate fissures, designated as thermal fissures, the purpose of which is to separate from the article per se the mass of glass or crystal, hereinafter referred to as moil, which served to retain the article in the course of its phase of shaping by hot plastic deformation. The demoiling per se is generally preceded by a scribing operation, the purpose of which is to create at the surface of the fragile material making up the article, in the desired plane for the separation of the moil, hereinafter referred to as the demoiling plane, by the action of a blunt tool, a mechanical fissure which is generally resulting from earlier operations and to round off the edge of the article in such a manner as to make its use more pleasant.
The heat treatment of glassware or crystalware articles in a plane perpendicular to an axis of rotation is conventionally performed with the aid of a source of heat or of cold, for example one or more burners conventionally utilized, one or more laser beams, one or more infrared radiant sources, or any other type of appropriate heat or cold generators, judiciously disposed within the environment of the article, in such a manner as to induce within this article an adequate temperature field. The articles are conventionally caused to execute a rotational movement about the axis of rotation under consideration in such a manner that the temperature field is as similar as possible within each section of the article passing through this axis. The treatment is performed either at a single working station or at a plurality of working stations by periodic indexing, or in a continuous and progressive manner by a heat or cold source disposed in a rectilinear or curvilinear float; in this latter case, the articles to be treated pass along in front of this float at an appropriate speed and the position of the heat or cold source constituted by the float in relation to the article is defined in a conventional manner by the projection of the configuration in a plane perpendicular to the relative movement of the article in relation to the float.
The relative position of the heat or cold source in relation to the articles is conventionally regulable for each type of article, and in particular the relative position of the heat or cold source in relation to the articles in a plane passing through the axis of rotation of the article in the course of treatment. The inclination of the heat or cold source in relation to the axis or rotation of the article, especially if the source is highly directional, is also of importance and is conventionally regulable for each type of article.
The practice of the heat treatment of glassware or crystalware articles in a plane perpendicular to an axis of rotation shows that, in the majority of cases, the best result is obtained when the distance between the heat or cold source and the wall of the article to be treated is kept constant. The practice of the heat treatment utilizing the flame burner or any other highly directional heat source likewise shows that, in the majority of cases, the best result is obtained when the direction of the flame or more generally of the heat flux, in a plane including the axis of rotation of the article, is perpendicular to the wall of the article.
In current p
REFERENCES:
patent: 2573266 (1951-10-01), Melcher et al.
patent: 2704418 (1955-03-01), Gerbaud
patent: 2883797 (1959-04-01), Eldred
patent: 3193369 (1965-07-01), Benard et al.
patent: 3790087 (1974-02-01), Banyas
Etablissements Biebuyck S.A.
Griffin Steven P.
Lacey David L.
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