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为什么喷洒效果不好,足够压力是关键  

2012-05-27 15:32:21|  分类: 默认分类 |  标签: |举报 |字号 订阅

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26 5月 2012 4: 00 下午 QUESTION: Kind of an odd question - approximately how many full pumps a r e r e q u ir ed o n a n i ce ly maintained B& G 1 gallon stainless steel sprayer? The label on Ma st er li n e B ife n th r in 7 . 9 st at es it should be used indoors at or under 25 p. s. i. , and I kind of feel li ke b uy in g a n d us in g a pressure gauge for such a basic task is unreasonable. I have been u n d er t h e imp r e ssi o n t h at , in general, a surface area sprayed with a finer mist would allow th e a r ea t o b e mo r e even l y treated, whether it' s carpet, tile, or something else. I know there ar e so m e c as es wh e r e s o me of the spray actually bounces off ( as I' ve learned in reading abo u t fl ea br o a d ca st s p ra ys ) , b u t do you know why the 25 psi thing was mentioned? Also, would yo u r eco mm en d a v er y h i g h ( but reasonable and safe) pressure be used on outside band sp r a ys? A n o th e r q u es ti o n a b o u t application rates on granular products. If a label states 8 oz per 1 0 0 s q fe et , is t h e ea sie st way to apply it to measure 8 oz of the product, place it in a little s h ak er , a n d t r y t o p l ac e t h a t pre- measured amount reasonably evenly throughout the 100 sq fee t? ANSWER: These are REALLY important questions, so I' ll go on for awhile. F ir s t on th e sp r a yer , an d th e nozzle tips on hand sprayers may be one of the most overlooked it ems i n o u r to o l b o x. Th e y get clogged and worn as time goes on and eventually the spray vo l u me an d p a tte r n t h at yo u THINK are coming out of them no longer are. I once had a techn i ci an co mp l ai n in g th a t th e flea product he used was no good and was simply not controllin g fl ea s. S o , I wa t ch ed h im apply it one time and realized that instead of the even fan patter n h e " th o u g h t" wa s b ei n g applied to the carpet, his clogged and worn spray tip was puttin g o u t t w o w id el y s p ac ed p i n streams. Probably 95% of the carpet wasn' t even being treated b e ca u se h e fa il ed t o c h eck h is equipment and to test it now and then to be certain it was in goo d wo r ki n g c on d i ti o n . Spray tips are designed to put out the proper GPM and spray pat te r n w h en t h e p re ssu r e i n t he tank is a specific PSI. When the pressure is not the ideal pressu r e f o r th a t sp r a yer an d it s parts you may be fracturing the droplets into too fine a mist or a ll o wi n g i t to d r i b b le o u t a n d miss the proper pattern for that application. B& G Equipment Co . h a s a n exce ll en t a rt ic le o n this topic on their website, and I think I' d call it " must" reading fo r e ver yo n e. W e c an ' t u s e spray tips as hammers or pry bars and expect them to perform p r o p er ly fo r eve r . On th i s article they state that the B& G sprayer and 4- way tip work best a t a b o u t 20 p si , b u t h u ma n nature is to want to have to pump that darned tank up as few time s as p o ss ib l e du r i n g a j o b . And, we get some feeling of satisfaction hearing the spray poun d in g o n to th e su r fa ce . So , o u r tendency is to pump it initially until we absolutely cannot get an o t h er p u mp d o n e, a n d th en to spray until the liquid is barely coming out any more. The reality i s th a t we p r o b a b ly st ar t a t 100 psi and go until it' s below 10 psi. This is the advantage that a pressure gauge provides - knowing exa ct ly wh a t t he p r es su r e in the tank is so you can keep it within the range that allows the eq u ip m en t to p er fo r m as i t is designed to, as well as to keep you within the legal requirements o n man y p r o d u ct L ab e ls. B& G and others have tried over the decades to develop an effect ive a n d r ea so n a b ly p r ic ed " electric" pump hand sprayer that maintains the tank pressure a t t he o p t ima l l evel . Th e ir Portable Aerosol System does this today, but only for void injecti o n o r cr a ck an d cr evi ce applications. A surface application, for fleas for example, is done best when a l l o f t h e sp r ay d r o p le ts la n d on the surface you are aiming at. When fine droplets ( " mist" ) are cr e at ed it i s l ik ely th e y w il l float off to someplace else, perhaps even onto surfaces that sho u l d n o t b e tr e at ed . Wh e n th e pressure is optimal and the spray tip is in perfect condition that " fa n " p a tt er n s h o u ld b e ejecting equal amounts of liquid from one side of that fan to the o th er , an d yo u w o u ld n o t want stray droplets going to other places. Keeping the pressure wh e r e i t is s up p o s ed t o b e helps to eliminate that " bouncing" effect, also known as " off site" a p p li ca ti o n . F o r ex ter i o r uses the same rules really do apply. Pumping up the sprayer to a n u n r ea so n a b ly h ig h pressure only defeats the work of the spray nozzle, although it d o es g i ve u s t h e sa ti sfa ct io n of less pumping and faster wetting of the surface. Here is where i t ma y b e mo r e a p pr o p r i at e to switch to one of the backpack sprayers instead of a small han d ta n k. For granular applications, just as with liquids and with fogging, it i s c r it ic al t o kn o w e xac tl y how much material you are applying to any given surface area o r vo l u me. I ' m w il li n g t o b e t that 95% of technicians in our industry do not calibrate their gra n u la r a p p l ica t io n s. If yo u don' t really know how much you are applying over that surface yo u e as il y c o u ld be u n d er o r over dosing, one that leads to ineffective control and one that lea d s to a fi n e fo r mi su s e. Perhaps the best way to calibrate is to accept that YOU turn the h an d l e on th e sp r e ad e r a t a rate " normal" for you and that you walk at a speed normal for yo u . S o, ma r k o f f a 10 0 0 sq u ar e foot area, place a measured amount of granules in your spreade r , a n d t h en t r ea t th a t 1 0 00 square feet in the normal manner for you. Then measure the we ig h t o f th e ma t er ia l st il l in th e spreader and the difference is the amount that YOU apply over 1 0 0 0 s q u ar e fe et o f su r fa ce. This also relies on using a consistent opening on that spreader if yo u h ave o n e th a t is adjustable. I know this is always going to be somewhat of an estimate, as w e re a ll y d o n ' t exp e ct a n yo ne to use a measuring tape to mark off 1000 square foot plots arou n d th e ya r d , b u t yo u s h ou l d get a feel for what that area looks like so your application is rea so n a b ly wi th i n t h e L a b el allowances. Using your suggestion would work too, but instead o f tr yi n g to ma ke th a t 8 ounces evenly cover that 100 feet, and in so doing perhaps try to ch a n ge yo u r o wn n o rm al application style, just find out how much you do use over 100 s q u ar e fe et an d th e n yo u w i ll know for other uses how much to put in the spreader.
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