Ton Covered Hopper
Dahle 20452 Level 2 Strip Cut High Capacity Paper Shredder Review
Dahle's largest shredder is designed for the very highest volume users, such as large company mail rooms or other business services. We took a look at the features of the 20452 and compiled a list of what we consider to be this machine's strengths and weaknesses.
Strengths:
- As Dahle's largest shredder, the 20452's most obvious strength is its huge capacity. With its powerful 4 Hp motor, the 20452 is capable of shredding up to 100 sheets at a time at 41 feet per minute, which all adds up to an astonishing 2 tons of paper a day. This capacity is more than enough for even the highest volume users including large corporate mail rooms, business services, and other such environments. The hopper-style feed is 17 inches wide, and really increases productivity compared to the normal type of vertical or horizontal paper feed.
- This looks to be an extremely durable machine, made of all metal and is clearly intended to be used heavily on a daily basis if necessary. There are three very convenient workspace shelves on which you can stack your documents during the shredding process. This is a machine that is designed for constant use, and perhaps to take the place of an outside shredding service.
- The control panel is very easy to use, and features fully automatic operation as well as a lock and key system that helps prevent accidents by keeping anyone who is not authorized to use the machine from doing so. This is a great feature for a busy work environment.
- With such a high volume shredder, you will want a shred bin that is large enough to cut down on the number of trips you'll have to make to the recycle bin. The 20452 comes through with a 50 gallon bin that slides out on rollers for easy access and emptying. You can even purchase bin liners that will make the process that much easier.
- The cutting heads, just like all of those featured on Dahle shredders, are milled from the finest steel from Germany. The cutting heads of the 20452 are also guaranteed for the life of the machine, and the rest of the 20452's parts are covered for two years. The heads are operated by an extremely powerful and rugged gear and chain system that pretty much eliminates the kind of slipping that can lead to paper jams.
Weaknesses:
- In the world of shredders, there is always a balance between capacity and security. As a Level 2 security strip cut shredder, the 20452 does not offer the highest security and may thus be best used for general rather than confidential or sensitive document shredding. In order to be FACTA compliant, for instance, you will need a machine that offers a security level of 3 or higher. Dahle makes several such shredders, but none with quite the capacity of the 20452. You will have to decide what is the right balance for the needs of your business.
- The 20452 is an extremely heavy volume, high capacity machine, and as such needs a lot of power. To operate the 20452 you will need to have 208 VAC 3 phase 20 amp service in the area in which you intend to place the machine. This is not a weakness per se, just something you should be aware of. You will also need to consider how you are going to transport and install this system in your organization. The last thing you will want to have happen is to have the shredder show up just to find out that it won't fit through your door.
About the Author
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Longxinzhiye Efficient Batching Systems
Batching Systems from China Longxinzhiye can batch more ingredients at a faster pace to keep up with the mixer and Weight Feeder.Larger numbers of ingredients are used.
Just going to larger and larger weight feeders isn't necessarily the answer. As more ingredients are used, each ingredient constitutes a smaller percentage of the batch.
Maximizing batching efficiency clearly takes a systems approach.
Today's high-capacity mixing systems require multiple batching scale to allow enough time to weigh each ingredient properly (Figure 1).
Each of these scales is a system unto itself--grounded corn, major ingredients, minor ingredients, bulk bag ingredients, micro-ingredients, and liquids. All of these systems must be coordinated to produce an accurate batch.
Screw Conveyor Design
Screw conveyors are the most common feeding system used in feed mills, and this is the place to start in designing an efficient Longxinzhiye batching system.
Screw conveyors deliver ingredients to the scale hopper by volume, not weight.
The volume the conveyor delivers to the scale hopper is determined by the pitch of the flighting as it leaves the area of the ingredient bin outlet.
The pitch of the flighting is the ratio of the flight spacing to the diameter of the flighting (Figure 2).
A proper weight feeder design requires that the pitch under the bin outlet area start small, then increase as the conveyor moves product along the bin outlet.
Pitch should not exceed 2/3 for light or normal ingredients or 1/2 for heavy or low-volume ingredients used in small amounts.
A top shroud at least two flighting diameters long should be installed in the weight feeder just beyond the bin outlet.
This forms a tubular area around the flighting that allows the screw to meter out each ingredient more accurately.
Beyond the shroud area, the flighting spacing should be increased to full pitch (1 / 1 ratio) all the way out to the weight feeder discharge.
This allows the screw conveyor to run less than full for more accurately control of the discharge cut off.
Limit feeder speeds to 100-105 rpm.
Weight feeder Sizing
Weight feeders must be sized properly in order to deliver ingredients into the scale hopper within the targeted mixing time. This is figured out in six steps:
1. Determine the maximum average capacity the system will be required to deliver in tons per hour.
2. Determine the system's design capacity. Include an efficiency factor to cover lost time increments that always occur in any system.
3. Determine the maximum weight of each batch to be placed in the mixer and Weight Feeder.
4. Use this information to calculate the size of the mixer, based on cubic capacity required, and total time required for each batching/mixing cycle.
5. Make assumptions about the time required to discharge the scale into the mixer and Weight Feeder, the time to discharge the mixer, and dead time between the stopping of each weight feeder and the starting of the next feeder.
6. Use this information to determine a target screw weight feeder time for each formulation used in the plant, or at least for several of the most used formulations.
Example
Let's take a feed mill that is required to produce an average of 60 tph, using a 4-ton mixer producing a formula from eight dry ingredients.
First, you always have to oversize the design to account for lost production due to variable factors--80% efficiency is a good target. So 60 tph /0.80+75 tph design capacity.
To meet this design target of 75 tph, the mixer would have to process 18.75 batches per hour (75/4).
In every hour, there are 60 minutes, so divide 60 minutes by 18.75 cycles to calculate the cycle time of 3.2 seconds.
Multiplying 3.2 minutes per cycle by 60 seconds per minute, you arrive at a cycle time of 192 seconds.
Now assume a scale discharge time of 15 seconds, mixer discharge time of 15 seconds, and a 4-second dead time for each of eight ingredients (32 seconds).
Subtract all of this from the 192-second cycle time, and you get 130 seconds for your target weight feeder screw time.
Figure 3 provides screw weight feeder sizes selected for each ingredient used in the batch and the amount of time needed to place each ingredient in the scale hopper.
Size your weight feeder to meet the target time.
Retrofitting
The budget may not be there for a new batching controler, but there are several ways to speed up existing systems:
Install a second batch scale hopper to weigh a portion of the ingredients. Feeder screws will have to be separated so each serves only one scale.
If the same ingredient is available in more than one bin, run both weight feeders at the same time. Program your controls to allow one weight feeder to stop shortly before the second to maintain final weight accuracy.
In stall a variable speed drive for the largest weight feeder screw motor, plus a selection system so the drive may be connected sequentially to individual feeder motors. That way, you can start and operate a feeder at much higher speeds, then slow it down as the desired weight is approached to maintain accuracy.
Enlarge bin discharge openings and put in larger weight feeders. This should be the last resort because of the expense.
This article is based on a presentation by Professor Fred Fairchild, associate professor in the Department of Grain Science and Industry, Kansas State University, Manhattan, and Feed batching Equipment News columnist.
Written by Grain Journal Editor Ed Zdrojewski
He spoke in May at the American Feed Industry Association's 1997 National Production School in St. Louis, MO.
Recent developments in batching control and mixing technology provide a large number of benefits to feed millers, but they also require millers to rethink their approach to efficient batching. Among these developments:
Batches are getting larger. Not too long ago, three tons was the industry's standard batch size. Today, mixer and Weighing Feeders handle six, eight, even 14 tons at a time.
Mixing has gotten faster. Newer mixer and Weight Feeders can adequately mix the larger batch size in 60 to 90 seconds.
Modern batching systems involve multiple feeders, and it's essential that weight feeder discharge rates be controlled accurately at faster and faster batching rates.
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