US 4,158,718 AGranted

Freely suspendable light-transparent heat barrier for window

AssigneeRobert Bosch GmbH

InventorsAlbin Kehl, Friedrich Scharf

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Abstract

A multi-layer flexible sheet is provided for hanging freely on the interior room side of a window, or the like, that reflects radiant heat from inside the room back into the room with high effective reflectivity, transmits light from the window into the room adequately for looking out, is easily rolled up when not needed, and, furthermore, can be used in summer to reflect out undesired heat and glare from incident sunlight without undue loss of transparency for looking out. A synthetic resin layer of polyethylene or polypropylene having a thickness not exceeding 0.1 mm is on the room side of the laminate and has a metallic film on its outward-facing surface of gold or aluminum that does not need to be of high uniformity in thickness. A cover layer of transparent synthetic resin on the side facing the window protects the metallic film from mechanical damage and is of strength and thickness sufficient to supply any additional necessary mechanical stability.

Claims21

Dependent claims

A substantially light-transparent heat-loss barrier for a light-transmitting and convection-opposing panel, such as a window, forming part of the enclosure of a heated space, said heat-loss barrier comprising a flexible and retractable curtain of laminated composite sheet material suspended loosely and freely on the heated-space side of said panel and spaced therefrom, and capable of being rolled up, said curtain consisting essentially of:

a thin, transparent flexible layer (12;
22) of synthetic resin material having the least possible absorption (A) in the infra-red spectral region, said layer being on the side of said curtain facing towards the inward portion of said heated space;
a thin vapor deposited metal film on the side of said synthetic resin layer facing away from said heated space, said metal film having a high reflectivity (R) in the infra-red spectral region and a high transmissivity (T.sub.F) in the visible light spectral region, and
a transparent flexible cover layer (14;24, 25) on the side of said metal film away from said synthetic resin layer for protection of said metal layer from soiling, corrosion and scratching and other mechanical damage and for lending some mechanical stability to said curtain;
said flexible layers being so thin, for the material used, that the composite sheet material formed therewith is capable of being rolled up from suspension for retraction of said curtain.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/869,450Filed 16 Jan 1978
Priority: DE 270368829 Jan 1977
Granted: 19 Jun 1979
Term ends: Not estimatedThe source records don’t support an estimate.

Classification28 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties
B32B 15/08
Comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 15/085
Of synthetic resin: comprising polyolefins