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Recycling of PLA (Polylactic Acid) Foam and Film Waste with The Plast-Agglomerator, Type PFV

Continuous Production of High Quality, Free Flowing Granules from PLA Production Waste

Method of Operation

During the production and processing of PLA foam and film, waste is generated. Valuable virgin material can be saved by recycling the waste. Recycled production waste can be reintroduced into the process for the production of new material.

Using a special process, the PLA waste is cut into a size smaller than 1/2. This size-reduced product is conveyed into the storage bin of the Plast Agglomerator with a pneumatic conveying system. From the hopper the feed material is continuously dosed into the agglomeration chamber by a feeding screw. Through frictional heat only and mechanical pressure the material is evenly sintered, within fractions of a second, through the holes of the die. The frictional heat and the mechanical pressure can be adjusted in such a way that the sintering is performed below the melting point of each type of plastic. Therefore, working right below the melting point of the PLA material, this guarantees a minimum thermal degradation of the product.

A rotating variable-speed, hot cutting device, cuts the material off after it was pressed through the holes of a die. These resulting strings or agglomerates are conveyed by the cooling air of a fan into the hot-melt granulator. The end product size of the agglomerate is determined by the size of the holes in the screen installed at the bottom of the hot-melt granulator.

The homogeneous size agglomerates from the hot-melt granulator are pneumatically conveyed and discharged into a cascade sifter. The sifting fan pulls fines out with the air, which are returned via a conveying pipe with cyclone to the Plast Agglomerator. The free flowing granules with high bulk density can be collected in super sacks or silos.

  1. Hopper
  2. Plast Agglomerator
  3. Hot Melt Granulator
  4. Cyclone
  5. Sifter
  6. Granules Cooler
  7. Sacking station

Advantages & Features

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Gentle agglomerating with frictional heat, right below the melting point, therefore minimum thermal stress of the product

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Excellent end product, i.e. free flowing granules with a high bulk density

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High throughput rate

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Fully automatic continuous operation, the system is designed for rough 3-shift operation

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Fully automatic cold start without previously cleaning the agglomerating chamber

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Low space requirement as the system is laid out in modular, compact and space saving design

Technical Specifications

Type

PFV

120

200

250

315

400

600

Throughput Rate

 

Kg/h

Kg/h

Kg/h

Kg/h

Kg/h

Kg/h

PLA Foam - 430 g/l   30-60 150-180 250-400 500-700 700-900 1100-1500

Drive Precutting Mill

kW

7.5-15

7.5-22 18.5-45 30-75 75-110 110-160

Drive Agglomerator

kW

22-30

45-55 55-90 75-132 160-250 315-500

Cool water

l/h

400-800

700-1100 700-1100 700-1100 700-1100 900-1300
Drive Hot Melt Granulator kW

3-3.5

12-22 22-30 30-45 45-75 75-90

* Throughput Rates illustrated above, which have been achieved during tests, serve as guidelines only.  To establish exact performance data with your material, in continuous operation, trials can be performed at our Research and Technology Center.

 

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2009 PALLMANN Industries, Inc.
PALLMANN Industries, Inc.
36 Atlantic Way, Clifton, New Jersey 07012 - USA
Phone: (973) 471-1450 - Fax: (973) 471-7152
Email: info@PallmannIndustries.com