Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including interlaminar mechanical fastener
Patent
1991-07-30
1994-02-22
Bell, James J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including interlaminar mechanical fastener
47 31, 139 29, 139457, 428225, 428229, 428257, 428258, 428259, D03D 300
Patent
active
052885453
DESCRIPTION:
BRIEF SUMMARY
This invention comprehends a shading and insulating screen comprising several flexible, parallel flat strips, extending completely flat lentgthways, without overlapping one another, and some transverse as well as longitudinal water absorbing fabric fibres interconnecting the strips and providing free interspaces between the edges of two adjacent strips, resulting in equal permeability over the whole surface.
It is mainly applied in market-gardening and ornamental plant cultivation on screens and blackout fabrics, to protect flowers and/or vegetables which are cultivated in greenhouses or in the open air.
The invention also relates to a procedure for manufacturing fabric by means of a circular or straight loom.
From EP-A-0089422 a shading and insulating screen fabric is known, made of thin strips of synthtic material, which are interwoven to form a sufficiently dense draughtboard to be impermeable to water but still permeable to water vapours and gases.
The strips are 25 to 50 microns thick and some 1.2 to 5.0 mm wide. They are arranged completely flat, without overlapping one another, so that between the edges of two adjacent strips some minimal interspaces appear, evenly distributed over the whole of the screen.
The manufacturing process allows easy screen light intensity adjustment and dosing, by means of alternating one or more transparent strips with some metallized strips.
The screen is extremely solid and durable, despite the use of a fragile and easy-to-wrap metallized polyester film or pure metal film.
EP-A-0109951 has taught us that instead of using lime dressing as a blackout means, in a greenhouse, a greenhouse curtain should be used, consisting of several flexible strips only extending lenghtways of the fabric and connected to one another by means of transverse and longitudinal fabric fibres. The longitudinal connective threads are mainly located at the underside of the strips near the interspaces between adjacent strips.
The transverse connective threads are located at the upper side and the underside of the fabric, and are connected to the longitudinal threads. The width of the strips corresponds with that of the interspace between the longitudinal connective threads with only the transverse connective threads in between. The upper side has some reflecting or non-reflecting and/or permeable or impermeable properties, so that it may or may not reflect or transmit the sunrays. The connective fibres are made of a certain kind of material, which will absorb the water because of surface activity.
The curtain is two-sided. The underside has some hydrophilic fabric properties, thanks to the presence of connective fibres which absorb and distribute the water by means of surface activity between the adjacent strips. The upper side has some reflecting properties and will reflect the sunrays.
Nevertheless, this screen can be rolled up or pulled away sideways only with great difficulty, because it gets easily distorted under side pressure.
The longitudinal threads are located in the interspaces between adjacent strips, close to the edges of the strips, without being in the way, so that the volume of the rolled-up curtain gets smaller. However, the fabric has a loose weave, because the longitudinal strips are not really tightened against one another. The fabric is distorted and tends to take a slanting position when the screen is pulled away or rolled up.
From EP-A-0029 173 we know that a greenhouse curtain should be set up as an insulating material, with a heat reflecting material positioned between the double parallel fabric strips. The double insulating fabric has a very good insulating and reflecting capacity, but because it requires double fabric bands, its cost price gets considerably high. These bands are connected with one another by means of a special construction.
Therefore, rolling up, hanging up or bringing together requires considerable space at both sides.
Said invention however, is to do away with these disadvantages. The new screen belongs to the kind described in conclusion 1 and which, a
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Bell James J.
Bonar Phormium N.V.
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