PMID- 37776810
OWN - NLM
STAT- Publisher
LR  - 20230930
IS  - 1879-2456 (Electronic)
IS  - 0956-053X (Linking)
VI  - 171
DP  - 2023 Sep 28
TI  - Decohesion of a polyolefin overlay from a substrate high density polyethylene 
      layer by impact induced stress waves.
PG  - 393-400
LID - S0956-053X(23)00595-0 [pii]
LID - 10.1016/j.wasman.2023.09.031 [doi]
AB  - High-density polythene (HDPE) is difficult to separate from food packaging waste 
      for recycling because the packaging occasionally has multilayer plastic labels 
      attached. Solvents are employed in the current separation techniques to remove 
      undesirable layers from HDPE substrates. The possibility of separating HDPE via 
      the impact-delamination phenomenon was explored both theoretically and 
      experimentally. Using the cohesive zone model (CZM), the decohesion of layers in 
      a model two-layer laminate made of HDPE and LDPE layers was studied 
      theoretically. According to this study, stress waves emerge and severely damage 
      the adhesion between the layers as a cutting blade strikes the laminate at speeds 
      greater than 40 m/s. The damage can be enhanced by increasing the strike velocity 
      and the apex radius of the blade. These findings show that a novel plastic 
      delaminator that can cut and delaminate the laminates simultaneously can be 
      designed. The proposed machine will feature two sets of blades with varying edge 
      apex radii. One set of blades can be designed to cause the most adhesion damage 
      while the other blades cut the laminate. This unique combination of cutting and 
      delamination operations has several benefits, including less solvent waste and 
      downstream processes, greater environmental friendliness, and faster HDPE 
      separation. Laminates from HDPE milk bottles were cut using a high-speed 
      cutter-blender with six blades to test the predicted results. The cut HDPE flakes 
      were separated pneumatically. According to FTIR analysis and SEM, only a trace of 
      adhesive was present on the cut and separated HDPE flakes.
CI  - Copyright (c) 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.
FAU - Priyananda, Pramith
AU  - Priyananda P
AD  - Key Centre for Polymers and Colloids, University of Sydney, NSW 2006, Australia.
FAU - Nguyen, Duc
AU  - Nguyen D
AD  - Key Centre for Polymers and Colloids, University of Sydney, NSW 2006, Australia.
FAU - Huynh, Vien
AU  - Huynh V
AD  - Key Centre for Polymers and Colloids, University of Sydney, NSW 2006, Australia.
FAU - Hawkett, Brian S
AU  - Hawkett BS
AD  - Key Centre for Polymers and Colloids, University of Sydney, NSW 2006, Australia.
LA  - eng
PT  - Journal Article
DEP - 20230928
PL  - United States
TA  - Waste Manag
JT  - Waste management (New York, N.Y.)
JID - 9884362
SB  - IM
OTO - NOTNLM
OT  - Adhesive failure
OT  - HDPE
OT  - Impact delamination
OT  - Laminates
OT  - Recycling
OT  - Stress waves
COIS- Declaration of Competing Interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2023/10/01 04:44
MHDA- 2023/10/01 04:44
CRDT- 2023/09/30 18:12
PHST- 2023/05/03 00:00 [received]
PHST- 2023/08/24 00:00 [revised]
PHST- 2023/09/22 00:00 [accepted]
PHST- 2023/10/01 04:44 [medline]
PHST- 2023/10/01 04:44 [pubmed]
PHST- 2023/09/30 18:12 [entrez]
AID - S0956-053X(23)00595-0 [pii]
AID - 10.1016/j.wasman.2023.09.031 [doi]
PST - aheadofprint
SO  - Waste Manag. 2023 Sep 28;171:393-400. doi: 10.1016/j.wasman.2023.09.031.