Thermal insulating curtain, especially for use in greenhouses

Abstract

A thermal insulating curtain, especially for use in greenhouses, which comprises a plurality of superimposed uni-directionally arranged tubular members with a common slat-like partition between each two adjacent ones of said tubular members. Each of these tubular members along its two opposite sides has a folding crease to allow collapsing said tubular members to thereby permit collapsing the entire curtain in a manner of a blind or to roll the curtain up in the manner of a shade.

What I claim is: 
     
       1. A heat insulating collapsible curtain comprising a plurality of parallel tubular members of plastic foil having adjoining sides bonded together to form lamellae along the bonded areas, the sides of the members extending in parallel planes connected by said lamellae, so as to form a curtain with spaced walls, a rigid member fastened along .[.the upper and lower surfaces the.]. .Iadd.a surface of at least one of said .Iaddend.top and bottom tubular members, .[.respectively,.].  said .Iadd.at least one .Iaddend.rigid .[.members.]. .Iadd.member .Iaddend.being angularly adjustable to move the spaced walls of said curtain in their respective planes and move the lamellae angularly relatively to said walls, each of said tubular members having creases along opposite sides to form folding lines for flattening the tubular member, so that said curtain may be collapsed by flattening all said tubular members, thereby forming a stack of such flattened members. 
     
     
       2. A curtain formed by a stack of superimposed flat plastic tube foils, with flat end strips of less width than said tube foils secured to the upper and lower surfaces of the top and bottom foils, respectively, the adjoining surfaces of said foils having a width substantially equal to the width of said flat end strips .Iadd.and being .Iaddend.bonded together with coatings to provide flat lamellae, said lamellae of the tube foils being connected by the sides of said tube foils .[.with the crease.]. .Iadd.which foils define therein creases .Iaddend.along opposite sides of said foils flexing to allow the sides to assume position in planes perpendicular to the planes of said lamellae to expand the curtain between said end strips, said lamellae suspended from said end strips at the same angle as said end strips. 
     
     
       3. A heat insulating curtain in combination according to claim 2, in which at least portions of said tubular members are heat impermeable. 
     
     
       4. A heat insulating curtain in combination according to claim 2, in which at least portions of said tubular members are heat reflecting. 
     
     
       5. A heat insulating curtain in combination according to claim 2, in which sections of said tubular members are translucent. 
     
     
       6. A heat insulating curtain in combination according to claim 2, in which at least a section of each of said tubular members is provided with a heat impermeable coat. 
     
     
       7. A heat insulating curtain in combination according to claim 2, in which at least a section of each of said tubular members is provided with a heat rays reflecting coat. 
     
     
       8. A heat insulating curtain in combination according to claim 2, in which said common slat-like lamellae are heat reflecting. 
     
     
       9. A heat insulating curtain in combination according to claim 2, in which only one side of said curtain is provided with a heat reflecting coat. .Iadd. 
     
     
       10.  A heat insulating collapsible curtain comprising: a stack of superimposed, inperforate, tubular foils,   said foils being bonded together along their adjoining sides over a band whose width substantially equals the curtain thickness to provide thereby in the expanded state of the curtain a pair of opposed, parallel spaced imperforate sidewalls and a plurality of spaced transverse walls interconnecting the sidewalls, with each of said transverse walls formed of the bonded sides of the adjoining tubular foils,   each of said tubular foils being longitudinally creased at substantially the midpoint between the successive ones of said spaced transverse walls to permit thereby the collapsing of said curtain in accordian-like fashion,   whereby said curtain in its expanded state comprises a plurality of parallel, adjoining, tubular air spaces situated between said parallel sidewalls and in its collapsed state folds into a highly compact assemblage..Iaddend.