DE142521C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

It is known to first use a smaller hollow body when producing certain hollow glasses to pre-press in a preform and blow it out in a finished form in the final shape. The glass distribution often leaves something to be desired, since the intermittent occurrence Compressed air results in a sudden expansion of the pre-pressed hollow body. Through this During the final blow molding process, the glass mass is often distributed irregularly.

Avoiding this is the purpose of the present invention. It is based on the fact that the pre-pressed hollow body instead of compressed air by means of a on the upper edge of the Finished form pressed-on moistened lid is blown out by the fact that the heat of the glass, the moisture in the lid is converted into steam, which is the pressure medium forms for blowing out. So it is with the glass bodies pre-pressed into an approximate shape proceed in the same way as is known for the intermediate bodies that one by placing a glass rind on one that holds the glass layer at the edges Ring and sinking the layer inside the ring. The new procedure allows a gradual, but not sudden, blowing out of the pre-pressed hollow body into the final shape in that the wet lid is several times shorter or longer and can be placed more or less firmly on the upper edge of the finished form, while the glass mass in the finished form sinks under its own weight. Since the Lid is easy to handle, the worker can constantly watch how far the Hollow body in the finished form has progressed in its formation, and he can this by the more or less quickly successive, firmer or lighter pressing of the Affect the lid. In this way, a much better gas distribution can be achieved than with the Blowing out by compressed air, which enters the hollow body with a short impact, is possible.

The accompanying drawing shows, for example, the execution of the method described above shown.

Fig. Ι shows the preform α , in which a hollow body c is pre-pressed by means of the ram b.

Fig. 2 shows the hollow body c excavated from the preform suspended in a finished mold d.

Fig. 3 shows the blowing out of a hollow body e in its final shape by means of the moistened lid f . The lid f can consist of wood, asbestos or some other material suitable for moistening.

Claims (1)

Patent claim: Process for the production of hollow glass bodies by pre-pressing a hollow body in preforms and finished blow molding in finished molds, characterized by pressing a moist lid onto the upper edge the finished molds, whereby the developed from the lid by the heat of the glass body Steam blows the pre-pressed hollow body into its final shape. For this purpose ι sheet of drawings.