大学毕业论文---选择榨汁机的诚实指南外文翻译及原文.doc

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1、The Honest Guide to Choosing a JuicerIn the 1930s a chap called Dr Norman Walker invented a juicer which firstly grated and then cut produce. The resulting mass was then to be put into a linen bag and placed under a hydraulic press, directing juice down a spout. (Dr Walker lived to 108 years of age

2、- he died in a surfing accident). You can still purchase this 2-stage Norwalk machine for around $2000, which is a very prohibitive price indeed. And most of the juicers you will find on sale havent evolved much since then, which brings us to.Centrifugal juicers. Centrifugal juicers work by using a

3、flat cutting blade on the bottom of a rapidly spinning strainer. Cut produce is flung out over the sides of the strainer. Due to the centrifugal force, juice then passes through tiny holes in the strainer. Features intrinsic to this design include:􀁺 The strainers are HUGE and a pain to clea

4、n􀁺 The cutting blades are tricky to clean and some are particularly dangerous to handle􀁺 The process incorporates mass oxidization and therefore a dying and brown juice􀁺 There is a lot of unpleasant froth􀁺 Leafy green vegetables are impossible, so no herbs and no

5、wheatgrass􀁺 Pulp builds up in the strainer and efficiency falls rapidly􀁺 The centrifugal force pushes a lot of pulp through the strainer, resulting in a lot of pulp in the juice􀁺 These juicers can seriously damage your hearing, and wont be popular in a terraced house or fl

6、at, or if anyone is still in bedUltimately, the technology inside a centrifugal juicer is not unlike that of a tree cutter. Theyre spinning at up to10000rpm. The resulting frictional heat is not good for your juice. Neither is 10000rpm an easy task for a motor when under constant resistance. The amo

7、unt you can spend on a centrifugal juicer varies from 30 to over 100 - so what are you paying for? Well, in truth, mostly brand name and aesthetic design. While the cheapest of machines are certainly week hearted and not going to last you long, experience and feedback tells us that more expensive ma

8、chines dont necessarily last any longer. In fact, if everyone who bought a juicer used their machine every day we think nearly every machine on the market would be withdrawn because with daily usage virtually all machines would fail within their first year, let alone within warranty. This guide has

9、been written as a result of the cumulative experience of several people, spanning over 4 years and many many juices. In this guide you will:􀁺 discover clearly the best type of juicer for you􀁺 pinpoint the best machine in each category􀁺 be saved from the confusion of confli

10、cting promotional material􀁺 benefit from unique comparison charts and photos􀁺 gain links to background information and in dependant reviewsAnd thats a brave statement for us to make but far braver is the warranty provided with juicers. Most people we speak to that have burnt out pr

11、evious machines never even took it back. We live in a throw away society sadly, but its great for manufacturers. Another fact of society is how many of us shelve new products. In a recent survey juicers were found to be the most likely new item to be left in the cupboard, second only to the George F

12、oreman style grills. We believe this is because of the above drawbacks of this style of juicer - as the high street centrifugal is by far the most purchased type of juicer in the UK. Centrifugal juicers that handle whole produce. WOW! what a feature, whole apples, whole heads of celery. Having said

13、that, impatience isnt the highest virtue. One health food author tells us its great being able to put in a whole head of celery, but the motor keeps burning out and I have to take it back to the shop. Ultimately, this feature is one of convenience, but the process still destroys the juice, and you s

14、till have to clean up after every glass produced as the strainer clog seven more rapidly.The juicers themselves have had no technical redesign other than a widening of their feeding chute, so there has been no consideration of increased motor resistance. Also, a wide feeding chute is extremely dange

15、rous an adult could loose their whole arm in there. Also, anything that doesnt fill the chute rattles all over the place, like a simple carrot. Generally there is immense volumes of foam and the juicers dump a lot of pulp into the juice which then requires straining. How many juicers do you want to

16、buy this year? One last word on whole fruit juicing: animals that live inside fruit. Think about it, even if your juicer can take whole apples, maybe its worth quartering each apple first. worm juice anyone? Centrifugal juicers with pulp ejection. A relatively small market place that holds a few dom

17、estic machines, and mostly commercial machines used by juice bars. Juice bars need juice QUICK (which is why they have to sacrifice quality and use the centrifugal process) and they cant afford to continually disassemble their juicer to clean it. In a centrifugal juicer that has pulp ejection, the s

18、ides of the straining basket are cleverly slanted, the air flow sending the pulp produced automatically into a collection basket without the need for cleaning. The process IS NOT full-proof by a long way, and offers no inherent improvement on all the flaws of centrifugal juicing already mentioned. P

19、lease be aware that stringy, fibrous produce and wheatgrass is still not a success in this type of juicer. If youre looking to incorporate these into your juice read on.A revolution occurred in the 1950s when Plastaket invented the Champion, the worlds first masticating juicer. Masticate means to ch

20、ew, and as the Champion is the only juicer with teeth we feel its the only masticating juicer available. Many other web sites will class gear juicers as masticators. We have put these into their own category below. The Champion juicer gives a greater yield then centrifugal juicers and the degradatio

21、n isnt nearly as severe. But its cutter is running at 1425rpm - and that can be a problem.􀁺 Leafy veg is still a NO - only now it gets caught in the teeth!􀁺 If you juice slowly (or the teeth are clogged with plant fibers) you get warm foamy juice as the cutter is spinning rapidly a

22、gainst the produce that hasnt yet cleared the juicing chamber. When the Champion arrived on the scene over 50 years ago, Siegfried Gursche, author of Healing with Herbal Juices, described as a tragedy the extremely high speed of the juicer which causes lots of friction which heats and sometimes even

23、 steams the juice. Some nutrients, especially all live enzymes, are destroyed by heat. Where the Champion excels (in terms of speed of throughput and yield) is with root vegetables. If youre planning to process A LOT of carrots, then the Champion would be a consideration for you (i.e. the Gerson Die

24、t). Although, in our opinion youd still be better off with a gear juicer, and you should make green juices your main stay. To read more about why the Champion should be nominated for retirement, click here. Now lets take a jump into the 1990s. Suddenly an innovation occurred in juicing.Low speed, ge

25、ar juicersGear juicers operate anywhere between 70 and 120 r/min. Thus, in a gear juicer:􀁺 Produce is crushed - No cutting or spinning􀁺 Enzymes are preserved􀁺 AMAZING green juices become possible􀁺 Your juice is cold, as it should be􀁺 You lift a glass of l

26、iving juice every time􀁺 They are the easiest of all juicers to clean (dont let anyone lie to you and claim that any juicer mentioned previously in this guide is easy to clean theyre not).As a visual representation of the differences we have prepared two glasses of apples juice - one prepare

27、d in a single gear juicer, the other in a centrifugal juicer. The rapid oxidization of apple juice makes this a good test for the colour and therefore vitality of the juice. Other produce would show similar results for the centrifugal produced juice, but typically the single gear prepared juice woul

28、d exhibit less or no foam. E.g. orange juice is entirely foam in a centrifugal juicer and zero foam in a single gear juicer. Many people have said or written that you need to drink juice produced in a centrifugal juicer straight after producing it. Usually it is explained that as the juice deteriora

29、tes you can benefit from the juice by consuming it straight away. PLEASE stop and think. If a process causes destruction, removing it from your sights quickly does not alter the destruction. If you want to juice for health you must produce the juice yourself in a low speed gear juicer. This is the o

30、nly way to gain benefit from the abundance of nutrition available in fresh fruits any vegetables when their fibre is safely separated. No other Apple juice extracted with a Single Gear Juicer􀁺 Has a healthy, even color, showing that its full of enzymes and nutrients􀁺 20% more juice

31、 yield􀁺 Less foam Apple juice extracted with a Centrifugal Juicer􀁺 Has oxidized and turned clear brown -only water content with no enzymes andnutrients􀁺 Poor juice yield􀁺 A lot of foam domestic or commercial juice preparation will give you the benefits of living e

32、nzymes,vitamins, minerals and other phytonutrients.So now that were totally convinced that its only worth drinking fresh juice if prepared using a gear juicers, weare left with one question - single gear or twin gear?Single gear juicersA single gear juicer has a single rotating screw or auger, with

33、an ever narrowing thread along which produce follows until crushed inside a screen which allows juice through and pulp to be ejected at the tip. This process is very similar to the worm gear of a meat grinder. The auger is divided into a two phase process of first crushing and then wringing-out the

34、produce against the wall of a conical filter screen. Single gear juicing offers you top quality juice with ultimate friendliness of use. You wont ever be put off using a single gear juicer, it will forever remain a joy. In the UK the original Oscar 502 has just been made available again as the Oscar

35、 Living Juicer, a machine youll see in juice bars like Planet Organic. There are a hoard of other single gear juicers available now, including the LE quip Visor, Solo Star and Live Please take note that despite superiority claims of the enzyme content produced by different gears juicers, there is NO

36、 evidence or test ever been done to identify if one machine is more successful than another in this area. It seems that all promotional material for this type of juicer, including unedited web copy, claims superiority. We would advise not basing your purchase around such statements. Additionally the

37、re is no evidence that slower is better (relative to this category, i.e. 70rpm is not better than 120rpm). TRUE, slow speed has immense benefits over thousands of revs per minute, but the small differences in speed between juicers in this category are not cause for you to choose the slowest.Single g

38、ear juicing was invented at the beginning of the nineties with the introduction of the Oscar 502, designed and Manufactured by a Korean company named Dong Ah which was founded by two business partners in 1988. One of the two businessmen betrayed the other, set up a nearby manufacturing facility, sta

39、rted a new company called Dong A Oscar (cheeky, hey?) and within a short time had produced the Matstone juicer - a copy of the Oscar design. Outside of Korea the machine was branded the Samson, and globally, Samson agents touted their machine as the new model Oscar. They cut a number of corners to m

40、ake their Matstone juicers more affordable and pushed heavily with their marketing. In one country, an ex-employee of the Oscar distributor stole $75,000 and the customer database before setting himself up as the Samson distributor. In the UK, where there was no resident Oscar distributorship, the O

41、scar was long forgotten, many people believing to today that their Samson/Matstone machine is the new Oscar. The story nearly finished with Dong A Oscar falling to bankruptcy on 26th September 2005.Enzyme juicers. These have not proved as efficient or reliable as the Oscar brand. We recommend lookin

42、g closely at warranty durations, as the Oscar Living Juicer offers 12 years, and only one other machine beats that. Dual stage single auger juicers The latest innovation in single gear juicers is a 3 phase extraction auger working inside a dual stage juicing screen. Upon the initial crushing of the

43、produce, any released juice is directed through the first stage of the juicing screen into the juice collecting bowl. The crushed produce minus much of its juice then continues its way through the machine, where there is a finer holed screen to obtain not only a higher yield, but a near pulp free ju

44、ice. The picture below compares a dual stage juicing screen (top) with a single stage juicing screen (bottom). Clicking on the picture will show alarger picture. This process is claimed to obtain up to 20% more juice than ordinary single gear juicers and mostly yields like a twin gear machine. A tes

45、t with carrots yielded 26% more juice! With other single auger juicers, the juice is only produced in the second stage, requiring larger holes in the juicing screen. Consequently a sieve is provided with other single gear juicers covering the juice collecting bowl to catch pulp. As juice is allowed

46、to exit at the first stage this type of juicer doesnt suffer from a number of problems that affect virtually all other juicers:􀁺 leaks, especially into the locking clip and motor housing (this causes long term problems with the gearbox as fruit acids reach the lubricating grease within the

47、gearbox causing extra noise and eventually a breakage. additionally locking clips / face plates of juicers are tricky to clean and add toyour time).􀁺 poor performance with soft fruits (soft fruits hold more juice extractable at the first stage. When trying to pass this juice onto the second

48、 stage of ordinary single gear juicers, typically nothing happens at all and produce remains stationary in the juicing drum with the juice and all the auger does is stir it).There are only two dual stage single gear juicers available on the market, the Solo Star II and the Oscar 900 VitalMax. Youll

49、note that both brands have been worn on earlier models. We prefer the Oscar VitalMax for a number reasons, including a lighter/sleeker design, as well as being easier to use and clean. Also, both stages of the Oscar juicing screen are stainless steel where as the Solo Star II has a plastic first sta

50、ge. Lastly, the Oscar VitalMax is the only juicer to hold a 20 year motor warranty. Now that is a brave warranty to implement. Oscar assure us that their machine has been tested beyond 10,000 hours of use. They insist we juice daily, and insist that they use the finest motor and components in the world. Perhaps some tell-tale signs of this quality reside in this machines performance,