| 摘要 |
A selectively collapsible and expandable insulating curtain having a plurality of collapsible tubes, preferably of plastic material, extending longitudinally for its width and superimposed one on top of the other in a row in the direction of curtain height. Each tube has an upper wall and a lower wall secured together by bands of adhering contact on opposite sides of the tubular cavity. Additional bands of adhering contact secure superimposed tubes to each other longitudinally along midsections of the upper and lower walls. The side bands of contact define fold lines allowing collapse and expansion of the tubes as the curtain is raised and lowered, respectively, in the manner of a venetian blind. The curtain may include additional rows of superimposed tubes one adjacent to the other in the direction of curtain thickness. The tube walls are comprised of a plurality of thin-film strips with bands of adhering material interlaminated between adjacent strips, the width of the mid-section bands corresponding to the desired width of the expanded tubes and the bands between successive adjoining layers being in a staggered relationship. After straightening, means may be secured to the tubular structure for hanging and selectively collapsing and expanding the curtain.
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