DE2124789A1 - Elastomer moulding bladder - reinforced with fibres, to produce reinforced plastic containers of the required size - Google Patents

Abstract

The elastomer bladder is used as a supporting core which can be deflated and removed from the container after moulding by winding synthetic resin impregnated fibres round the bladder.

Description

Description Title: Thread-reinforced elastomer molded bladder and its Application for the production of containers of any size from reinforced plastics Field of application: The use of fiber-reinforced plastics for container construction is increasing. Here come the characteristic properties, such as low specific weight with high strength and very good corrosion resistance, very contrary to the demands placed on a container. A major disadvantage is the high manufacturing cost. Since the synthetic resin compound in the manufacture of a If the container is fluid and the reinforcing fiber is flexible, these materials must be used be applied to a support core.

Purpose: The fiber-reinforced molded elastomer bladder described here is intended to reduce the manufacturing effort and thus the costs for containers.

State of the art: To create the necessary support lugs many processes and materials are known.

There are three main groups to be distinguished zit @ 1. Mechanical cores, like collapsible cores, retractable cores or lightweight cores that are mechanically destroyed and removed.

Criteria: High production costs, very prone to failure and cumbersome handling.

2. Detachable cores which, cast in a mold, after solidification of the container can be removed by melting, loosening or rinsing.

Criteria: high equipment and energy costs 3. lost cores, which remain in the container as interior lining.

Criteria: Unnecessarily thick inner walls Task: The invention has the task of eliminating the disadvantages of the aforementioned cores by making them easy to use largely to compensate, solution: This task is dadjircli according to the invention solved that the thread-reinforced elastomer molded bladder has two different properties having.

To manufacture the container, it must be a dimensionally stable core, (Fig. 1 and 2) and for removal from the finished container, it must be elastic in itself collapse without being damaged (Fig. 3).

Function as a dimensionally stable core: a prerequisite for a dimensionally stable core Behavior of the elastomer bladder, designated as part 1 in Figure 1, is that it is made in the thread winding process exactly with the geodetic pattern corresponding to the container contour is. This means that when the elastomer bladder is subjected to internal pressure, all reinforcement threads be burdened equally.

So there must always be isotensoid container contours. These Condition inevitably results in the optimal strength properties for the respective container required ideal contour.

After the elastomeric bladder produced in this way has been removed from the core walrde, it is mounted on a winding holder (part 2, picture i> gas-tight. This winding holder consists of a tube closed at both ends, which is connected to a Operating pressure of 10 atü can be applied. Via the connection $ (6) the Pipe compressed air supplied. This compressed air becomes one of the pressure regulators (3) of the bladder supplied. I) the internal pressure of the bladder depends on the pressure for the cell, ilte t'r required wall thickness and is in the range of 0.5 2.5 atii with the leglel- (3) set. In order to be able to compensate for diffusion losses during winding the Rohn @ (2 filled with 10 atm compressed air as a storage tank, the The valve (6) is shut off and the supply line removed. On the prepared bladder prefabricated flanges (7) are attached and the container windings made of synthetic resin impregnated Reinforcement threads (8) applied (Fig. 2).

Function as a shrink bubble: After the resin has hardened and so that the container itself is dimensionally stable, the bladder is removed as follows. That Valve (5) is opened to let the compressed air escape. Then one will Vacuum pump connected to the provided with a release agent before winding Detach the bubble from the container wall. The bubble shrunk in this way can pass through the flange openings removed and prepared for the next container.

An inner lining required for pressure vessels can be installed in front of the Wrap on the bladder or now through a spray lance (9) while turning at the same time be injected into the container on the roller blocks (10). The latter solution brings a considerable time saving.

Claims (1)

Claims Thread-reinforced elastomer molded bladder and its use for production of containers of any size made of reinforced plastics. Characterized in that it is used as a removable core will.