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Shredder efficiency

This topic contains 13 replies, has 7 voices, and was last updated by  Mathijs Stroober 1 month ago.

5
Mathijs Stroober mathijsstroober

Shredder efficiency

08/06/2018 at 09:37

For a future project, we are looking for shredder efficiency and also for waste processing (read cleaning, shredding, sorting).
The coming weeks I will post several tests and outcomes of shredding different materials and also different waste compositions.
My research about cleaning will be updated in this topic.

For this project I used the shredder built by @peter-bas.
See pictures below

The motor is 1.5 kW and makes 1430 rotations a minute. With the gear, slowing down 20 times, results in 71.5 rotations a minute for the shredder.

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In reply to: Shredder efficiency

dedicated
08/06/2018 at 10:17
3

Material: PP
Amount: 2.7
Method: Shred
Preparation time: –
Prep amount/h: –
Shred time: 60 min
Shred processing kg/h: 2.7
Remarks: Big PP products. Broke it down into smaller pieces during shredding process. Thick walled plastic is difficult to recycle.

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In reply to: Shredder efficiency

helper
08/06/2018 at 10:47
2

Noice being a engineer student it is always great to have data. Especially “Work” numbers.

In reply to: Shredder efficiency

dedicated
11/06/2018 at 09:42
2

Test number 2
Material: HDPE
Amount: 0.617kg
Method: Shred-Wash
Preparation time: –
Prep amount/h: –
Shred time: 6.5min
Shred processing kg/h: 5.70
Remarks: I could not keep up with the pace of the machine while it was shredding bottle caps. I was too slow with cutting the bigger objects

 

Test number 3
Material: HDPE
Amount: 0.617kg
Method: Wash-Shred
Preparation time: 15 min
Prep amount/h: 2.47
Shred time: 4 min
Shred processing kg/h: 9.26
Remarks: This batch was first cut and washed and than shredded. Therefor, the time is shorter while I shredded the same amount of plastic

AVERAGE: 9.02 kg/h

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dedicated
14/06/2018 at 08:58
3

Carry on the great work Thijs 🙂

In reply to: Shredder efficiency

warrior
14/06/2018 at 09:34
1

Awesome work, thanks for taking the time to provide statistics

In reply to: Shredder efficiency

dedicated
14/06/2018 at 17:52
2

Test number 4
Material: PET
Amount: 0.508kg
Method: Wash-Shred
Preparation time: 19.66 min
Prep amount/h: 1.55
Shred time: 4 min
Shred processing kg/h: 7.62

Test number 5
Material: PET
Amount: 0.508kg
Method: Shred-Wash
Preparation time: 6.3 min
Prep amount/h: 4.84
Shred time: 3 min
Shred processing kg/h: 10.16

Test number 6

Material: PET
Amount: 1.2kg
Method: Wash-Shred
Preparation time: –
Prep amount/h:
Shred time: 15 min
Shred processing kg/h: 4.8
Remarks: done by somebody else. Bit slower than trained person

AVERAGE: 7.5 kg/h

In reply to: Shredder efficiency

helper
18/06/2018 at 21:42
1

Cool, is the shredder still going strong? Any sign of wear?

In reply to: Shredder efficiency

dedicated
19/06/2018 at 19:30
2

@peter-bas yes it is still going strong. Works well, only gets a bit hot at the blades while shredding PET

In reply to: Shredder efficiency

dedicated
19/06/2018 at 19:38
1

Hey @mathijsstroober

It is interesting to note the heat on the blade while schredding PET; do you think it could be linked to the fact it is a very dense type of plastic ? Also do you think you could measure that blade temperature ? would be interesting to know if the schredder actually starts to create mini-melting points (which would be bad considering PET needs to dehydrate before reaching melting point)

In reply to: Shredder efficiency

dedicated
19/06/2018 at 19:59
1

Hi @imuh
Never mesured the temp on the blades. I think it stays under melting temp.
PET has a bit higher friction coefficient than PP and HDPE. Or because it is tougher, so it stays longer in the shredder.

In reply to: Shredder efficiency

dedicated
25/06/2018 at 13:35
2

Oke,
I did more tests and there I all the results in this spreadsheet.
I think that we can build on this spreadsheet to get a better idea of the different shredder capabilities. So feel free to add your shredder experience. And do not forget to fill in your shredder specs. I did never work with an open spreadsheet on a forum so curious how it goes.

Conclusion so far:
It highly depends on the type of products how fast you can process. Also experience has an influence on the results. So this is not a set average but an estimation of the shredder capabilities.

PP small items: 12 kg/h
PP big items: 4.5 kg/h
HDPE small items: 33 kg/h
HDPE big items: 9 kg/h
PET bottles: 7.5 kg/h

In reply to: Shredder efficiency

new
03/07/2018 at 12:00
4

Hi, I’m David from Congo.
We would like to start a project locally and we will be working exclusively with PET or PP bottle and HDPE bottle cover. Our goal is to reach an average of 200 Kg per day (25 Kg per hour). What is the motor configuration you can advice us.

Thank you very much to help us potting in place because plastic waste management it is a big issues here (look at the picture)

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dedicated
04/07/2018 at 10:31
1

The setup we use (see begin post) is working good. I am not a shredder expert but I know that the gear/reducer is important.
Check out this topic

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