Membrane cover having a protective layer to prevent deterioration of UV stabilizers therein

a membrane cover and protective layer technology, applied in the field of membrane covers, can solve the problems of deterioration of uv stabilizers in the membrane cover, loss of uv protection, and inability to address the problem of uv stabilizer deterioration in the membrane cover

Inactive Publication Date: 2005-10-06
GEOMEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] Each foam layer has a thickness of about one-half inch such that a stiffness provided by these two layers prevents wind-induced fluttering in a membrane cover made with this structure.

Problems solved by technology

As these metal oxides are modified or corroded, the UV protection is lost and the life of the membrane cover is proportionally reduced.
It is believed that the problem of deterioration of UV stabilizers in a membrane cover has not been addressed in the prior art.

Method used

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  • Membrane cover having a protective layer to prevent deterioration of UV stabilizers therein
  • Membrane cover having a protective layer to prevent deterioration of UV stabilizers therein
  • Membrane cover having a protective layer to prevent deterioration of UV stabilizers therein

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Embodiment Construction

[0018] While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will be described in details herein one specific embodiment, with the understanding that the present disclosure is to be considered as an example of the principles of the invention and is not intended to limit the invention to the embodiment illustrated and described.

[0019] The preferred membrane structure 20 is partially illustrated in FIG. 1. The preferred membrane structure 20 is made of a top layer 22 bonded to two foam layers 24, 26. The foam layers 24, 26 are made of semi-rigid foam insulation. The top layer 22 is impermeable to water and gas and is resistant to ultraviolet radiations. The two foam layers 24, 26 are bonded together and to the top layer 22, as illustrated in FIGS. 1 and 2. The bonding of the three layers is effected by hot-melt welds.

[0020] One of the foam layers constitutes a bottom layer 26 and is intended to be in contact with the liquid sur...

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Abstract

The membrane structure according to the present invention has a top layer containing three plies. The top ply has UV stabilizers embedded therein; the bottom ply has stretch-resistant elements embedded therein; and the middle ply contains a co-extruded polyvinylidene chloride barrier film for example, for protecting the top ply against bio-gas infiltrations therein. In another aspect, the top and bottom plies containing polyethylene for protecting the middle ply from the weather and from corrosive environments under the membrane cover. In yet another aspect, the membrane structure has two foam layers affixed to the bottom ply. Each foam layer is made of juxtaposed strips of semi-rigid, closed-cell, polyethylene foam; wherein each strip in one foam layer is laid astride the adjoining edges of a pair of strips in the other foam layer. The strips of foam are bonded together and to the undersurface of the bottom ply by strips of fused polyethylene.

Description

FIELD OF THE INVENTION [0001] This invention pertains to membrane covers for industrial, municipal and agricultural reservoirs and lagoons, and more particularly, it pertains to a floating membrane cover having a top layer, UV stabilizers in the top layer, a structural layer in contact with the liquid surface of a reservoir and a bio-gas-impermeable shield laid between the top layer and the structural layer. BACKGROUND OF THE INVENTION [0002] It has been noted that the useful life of a membrane cover covering a wastewater reservoir in a warm-weather region where the cover is exposed to much sunlight, is somewhat reduced as compared to covers installed in colder climates. After analysing several installations of different ages and in different environmental conditions, it was understood that the porosity of a membrane cover increases with temperature and that the bio-gases generated under a membrane cover slowly seep or migrate upward through the membrane layers and react with the me...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01C3/02B09B1/00B29D7/01B32B5/18B32B7/02B32B27/32B32B33/00B65D88/34B65D88/42B65D90/54C02F3/00C02F11/04E04B1/34E04C2/00E04H4/10
CPCA01C3/028B09B1/004B32B7/02B32B33/00E04H4/10B32B2307/7242C02F3/00C02F11/04C02F2103/007B32B2307/71Y02W10/37Y02W30/30B32B2266/025B32B5/18B32B2307/734B32B2307/714B32B2307/712B32B27/304B32B27/32B32B27/12B32B2305/022B32B2601/00B32B27/065
Inventor DEGARIE, CLAUDE J.DUFRESNE-NAPPERT, SYLVAIN
Owner GEOMEMBRANE TECH
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