CS248803B1 - Straithening method method of flat materials - Google Patents

Abstract

Method of flattening flat materials in spiral wound modules for the treatment of liquid media. Existing known methods for preparing spiral wound modules sheet materials to the center tube the module, most of it being attached material in front links and the sides of the sheet materials. The described method prevents by means of a strip of flexible material curling and sagging area materials in their medium parts. This ensures symmetry module winding and high reproducibility production. In a new way, you can proceed with production a spiral wound module, e.g. ultrafiltration and reverse osmotic membrane materials.

Description

BACKGROUND OF THE INVENTION The present invention relates to a method of leveling sheet materials in the manufacture of spiral wound modules.

The spiral wound modules are manufactured worldwide by interleaving the membranes into an envelope form by intermingling and reinforcing nets, and the resulting layers are adhered to the perforated central tube at the edges of the front sides so that the membrane folding is located at the central tube. The central tube is perforated, or serves as a bus for the liquid medium that passes through the membranes, i.e. the permeate.

Thereafter, the individual layers are held in a spatial arrangement by means of jigs and complex devices. After the respective layers have been glued to the side and rear sides of the sheet materials, the individual layers are simultaneously wound onto a central tube, whereby the wound layers form a spiral wound module (e.g., US Patents No. 3, ^ 17,870¾ 3> 3,77 ^ 5) »397,79θ). This results in a spiral wound cylinder, which is then exposed from one side to an inlet liquid medium (mostly aqueous solutions) that flows around the individual sheets. In order to achieve a perfect bypass, the assembly is sealed in a pressure cylindrical vessel, i.e., an inector connector, which represents the module seal from the outside to the interior of the pressure vessel. The modules are connected in series in practical applications. The pressure vessel is equipped with a water inlet and a concentrate and permeate outlet.

Known processes in which individual sheets of sheet material wind around a central tube exhibit a number of problems, including the need to use complex fixtures and devices, especially in the case of multi-envelope spiral wound modules, the fact that sheet materials adhered to the central tube at side and The front sides tend to move away from the center tube in their central part, to curl and flex. As a result of these phenomena, the sheet materials are wound unevenly, resulting in asymmetric winding and irregular termination of the outer layers of the spiral wound module, »2 · *

248 803

Functionally, the above-mentioned shortcomings increase the risk of incorrect winding of the module and thus decrease the functionality of the module or its irreversible damage *

These drawbacks are eliminated by a method of leveling the sheet materials formed by the distribution, removal and membrane materials in the manufacture of spiral-wound modules for the treatment of liquid media by membrane processes, characterized in that the strip of flexible material, preferably paper, has a strip length equal to at least circumference of the module center tube, is glued at one end along the circumference of the module center tube, and the free end of the strip is glued to the front of the sheet materials.

and

By the method of the invention, one or more strips may be adhered to the sheet material, the free end of each strip being glued to the periphery of the central tube. By using the method according to the invention, the material does not deform during winding, the individual layers of the sheet materials in the module are symmetrical and consequently the modules are produced with a high degree of reproducibility and reliability.

The method according to the invention has produced a series of four-, four- and six-shell spiral wound modules, and the functionality of the modules has been tested by demanding tests.

Fig. 1 illustrates one embodiment of a method of straightening sheet materials according to the invention.

Claims (1)

A method of aligning sheet materials consisting of distributor, drain and membrane materials in the manufacture of spiral wound modules for treating liquid media by membrane processes, characterized in that a strip of flexible material, preferably paper, in a strip length equal to at least one and a half , is adhered to one end of the module central tube at one end, and the free end of the strip adheres to the front of the sheet materials.