DE7600621U1 - Plastic barrel - Google Patents

Description

Plastic barrel

The innovation concerns a blown barrel made of thermoplastic Plastic with surrounding the barrel jacket and / or roller hoops arranged on the head and elode part.

It is known to put prefabricated rolling tires in the blow mold and while ax blowing the extruded hose a welding of the rolling hoops with that of the barrel shape to achieve expanded hose. Hisrbei surrender In so far there are problems because a molded part surrounding the hollow body as a whole is to be welded to it. The blow molds must be equipped for this purpose with complicated devices that the molded parts as Record intermediate form with separate locking elements. The intermediate form is when the Main shape added as a storage part and together with this forms a unit in the closed state.

In the production of wide neck containers, for example, it is known to use prefabricated thermoplastic head rings Plastic to reinforce the barrel opening when the main mold is open in a centrally located under the outlet nozzle to clamp the intermediate mold arranged in the blow molding machine, so that the lowering tube passes through the center of the head ring wanders through. When the two close Mold halves, the intermediate form slides into corresponding recesses, so that the main and intermediate form are one Form unity.

Furthermore, in the case of wide-necked containers without head rings, it is known to connect a prefabricated ode ring with the forming barrel during the blowing process by placing the ring on a separate, lower, one-piece mold section

7600621 05/06/76

is placed and centered in the lowered state. Here it is necessary, however, to the end of the lowering To close the hose with a special tool and the forming behind the closure point Dispose of hose remnants as waste. The technique of hose closure and waste disposal is complicated and time consuming. After completion of the intermediate work step, the main mold halves are moved together and the lower mold section raised together with the foot ring, so that the overall shape is closed.

It is technically complex to create a hollow body, for example a bung barrel with specially prefabricated head and foot rings to be produced in a blow molding process. Head and foot rings are in barrels because of the better handling, rolling and Cranability, however, is desirable. This is especially true with plastic drums. A filled plastic barrel can hardly placed on the floor because of the changes in shape and be rolled. Rolling over the bottom edge when the barrel is tilted upright is due to the deforming surface The transition from the jacket to the floor is difficult to carry out. Finally, there is a transition from the coat to the head no suitable means of attack to get the barrel over the bottom edge to set in rolling motion or to insert crane hooks for loading.

That’s why it’s also done, head and foot rings made of metal to be retrofitted on blown hollow bodies »This requires complex assembly work and later permanent deformations of the metal rings accepted will. Since the expansion between plastic and metal continues with high temperature differences up to one seven times the difference, the mechanically jump rings held on the plastic.

7600621 05/06/76

t II till

It is about the task of making a roll hoop barrel like this design without the need for specially prefabricated rolling tires placed in the blow mold or subsequently attached to the barrel shell.

This object is achieved according to the invention in that the rolling hoops are in the rolling hoop after the blowing process In the middle areas, the blow mold is split horizontally by moving the molded parts together in the axial direction of the barrel are formed radially outward from the barrel jacket, with corresponding rolling hoop form in the form dividing surfaces Recesses are provided into which the material formed from the barrel jacket penetrates.

In the drawing, the innovation is described using the example of a bung drum »

Show it:

1 shows a bung barrel with rolling hoops, FIG. 2 a bung barrel with top and bottom hoops.

The barrel jacket of the bung barrel according to FIG. 1 is denoted by 1. From your barrel jacket 1 are the rolling tires 2 by moving the molded parts (not shown) together in the axial direction of the barrel after the blow molding process shaped outwards. From the respective, horizontally outwardly directed rolling tire webs 5 are the parallel to the barrel axis in the direction of the barrel head or Barrel bottom angled running surfaces 6 of the Hollreifen 2 "just before.

In the case of the bung barrel according to FIG. 2, the barrel casing 4 the head and foot hoops 3 formed.

7600621 05/06/78

Claims (1)

t ix r "· ι ι · t" j ι a · t tit. Protection claim; 1. Blown barrel made of thrmoplastic plastic with the Rolling hoops surrounding the barrel jacket and / or on the top and bottom parts, characterized in that that the rolling hoops (2, 3) after the blow molding process in the in the rolling hoop center areas horizontally split blow mold by moving the Molded parts in the axial direction of the barrel from the fitting jacket are formed radially outwards, in the form of dividing surfaces recesses corresponding to the shape of the rolling hoop are provided into which the material formed from the barrel casing (1,4) penetrates. 7600621 05/06/76