CS228697B1 - Process for manual production of glass hollow products with a shaped mechanically stressed neck,particularly building moulded blocks - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for the manual production of molded hollow glass articles. mechanically stressed throat, in particular building blocks weighing more than 30 kg, blowing on a whistle, at least 2 neber skis.

It is known to manufacture high-weight hollow glass articles by hand in a sawmill in which multiple glass-glass pickups are used, as described in U.S. Pat. in Glass Technology Volume I - Kitejgaradskij β kol., Prague 1954, p. 197.

When it comes to high-weight products with a neck, it is known, for example, to manufacture television banks in which the neck portion of a product called a neck is made undulated and welded to the cone of a television bulb. The neck is not shaped here, but must maintain the diameter. Welding parts is a relatively complex, delicate and laborious operation.

It is also known to manufacture large containers with a throat, such as demijohns, in which the throat is formed in the final part of the twisting process, either from another batch of glass that adheres and creeps after heating, or . Creeping is also another operation and the neck portion of the product is not permanently mechanically stressed in use, at most in the short term. In the bending, the neck portion is not substantially stressed.

By these methods, it is not possible to produce structural elements with a shaped neck which is attached to the structure of the building and therefore is subjected to a high mechanical stress.

228 697

These disadvantages are eliminated or substantially reduced by the method according to the invention, which consists in forming a neck in the preform into a final shape and the resulting pre-attached to the neck of the pistol and cooled to a temperature corresponding to a viscosity in the range of 10 to 10 ¹² Pas; it is heated superficially before the next up to the throat height.

By the method according to the invention, it is possible to produce monolithic hollow components, in particular a cladding block with decorative and visually optical effects, which cannot be produced by any other known method. The neck portion of the article is shaped from the outside as required to firmly attach to the structure. The throat can withstand high stresses, especially in bending, eg when the blocks were wall tiles.

The process according to the invention makes it possible to produce glass products weighing not more than 30 kg, rotating and non-rotating shapes with a defined throat in an economical manner, with minimal glass waste. In this case, the molten glass is functionally used to produce the neck and the actual waste is minimal and does not exceed 5% by weight of the final product.

An exemplary embodiment of the invention is described more fully and schematically in the accompanying drawings, in which: FIG. 1 represents a glass bulb on a piston; FIG. 2 shows a preform with a neck formed in the preform; FIG. 5 shows the finished product.

The glassblower does not take the heated sawmill in the ski and blows out the flask 2 (Fig. 1). Repeat the collection until it reaches the required flask weight 2.

The flask 2 is inserted into the preform f, in which the pre-fi is blown with the neck fi and the body (Fig. 2). At this stage, the throat fi has already acquired its final door dimension, and only the pre-door fi body 6, which is already shaped in shape as the starting flask for further glass acquisition, is further shaped. It is advisable to keep the weight of the front door fi cc8 one third of the weight of the final product. After cooling to a temperature corresponding to a viscosity in the range of 10® to /

In the waist, the preform body 6 is superficially heated in order to better engage the next glass batch 2 (FIG. 3). The next batch of glass 2 is not taken up to the throat level, and all glass from this collection remains a permanent part of the article. A further glass gob 2 heats the preform body 6 and allows further shaping of the body 8 in the finishing mold fi (Fig. 4), thereby forming the final product 10 (Fig. 5) which separates from the pleated fi.

The product 10 is primarily intended as a building element for the creation of special peripheral claddings of buildings or possibly of soffits. The product 10 provides for mechanical stressing of the neck fi, in tension and pressure, with a critical point not being stressed at the transition point, the neck fi into the body 8 of the product 10. For this reason, it is necessary to maintain certain relationships between the weight and size of the article 10, the size and strength of the neck fi and the wall thickness of the body 8 of the article 10.

Claims (1)

SUBJECT OF THE INVENTION Process for the manual production of hollow glass articles having a shaped, mechanically stressed neck, in particular building blocks, weighing more than 30 kg, by blowing on a spindle, with at least two enamel cuts, characterized in that the neck is shaped into a final shape and a preform formed the throat of the preload was cooled to a temperature corresponding to a viscosity in the range of 10® to 1θ ^{2 2} .