Screen systems have become increasingly important for the cultivation of all form of crop and are therefore more often used . The use of screen installations already exchange with the function of diaphragm screenland and now with conditioned cultivation , air mixers , PAR perfect and ' The New Cultivation ' .
Willem Vriezen and Dave Boer
All these new developments mean that ascreen is being used much more often and intensively . Dave Boer of Huisman Screen Systems : " Where the screen used to open and close up a few time a day we now see dozens of movements a daytime and sometimes an minute . In existing tensile wire installations we see fast abjection of the tensile wire as a result . In many cases this requires an improvement of the standard wrench conducting wire . "
Huisman has position itself the goal of grow a pliable cable suitable for this increasingly intensive purpose . " The pulling cable must be well resistant and flexible at the winding cylindrical lining and turn wheels , and in gain , the cable must have minimal reach at the long distance . "
In addition to the intensive consumption , greenhouses are getting big , and the identification number of screen layer is increasing . The lower screen may be closed all daylight , thus obscuring the view of the facility above it . It is often unacceptable to " see " the entire screen installation each twenty-four hour period and thus discover if any pull wires are broken . Dave : " This intensive use of the filmdom installation and the changing reliability requirements place different demands on the steel wire R-2 . That is why we were looking for a blade cable with a farsighted life and that also meets the compliments and requirements that are presently placed on a sieve installation . "
Huisman has been testing blade conducting wire roofy on its psychometric test bench for yr . This test bench is especially built where they can examine several cables at the same time for lifespan and wear and tear . Due to a advanced design , the wires are stretch on tensile force , have to wind up and unwind over and over again and rotate over the same reverse wheel . Just like in practice .
Dave Boer
Dave : " To get a skilful insight , we started to extensively test the regular sword cables . We compared the resulting data with the results and with data from the field and practice . We receive information from several raiser about the average number of blind movements per twenty-four hours and the use in cosmopolitan . After test the standard cable , we bug out test other exist cables . Second come a blade wire with rope core on the trial judiciary . This cable television is also used in plastic cable television service barrel and turning rack . As a third line , we tested the plastic cable system that is on a regular basis used in motion picture glasshouse . "
With the requirement parcel and the results of all the tests , they sat down with the manufacturer . From this , unexampled designs issue . We started testing these cables . Some cables were dropped and others performed better .
Eventually , they were able to project a cable . The cablegram has a new construction of yarn and consists of a mixture of different thinner and thicker yarns . Combining the yarns and the manufacturer ’s high quality made them decide to quiz this further . The thread was lade with 250 kilo . That is a importantly high load than in practice . Dave : " Compared to standard steel cables and also steel cablegram with circle core , we see that the active cable can withstand as much as 7 to 10 times more bending moments . "
For more information : Huisman Screen SystemsLeehove 392678 MA De LierTel : +31 ( 0)6 549 17 411[email protected]www.huismanscreensystems.com
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