Results of direct moulding conducted in TEBAMIX
SMARTSustainable Moulding of Articles from Recycled TyresFirst
Year Project MeetingRome, the 27th and 28th of February 20131The
following samples were received from:Rubber granulate(powder) 0-0,8
mm*Rubber granulate 1-2 mm*Rubber granulate 1-4 mm*Rubber
buffing**
*- produced by ORZE S.A. - miw ** produced by FBO Rubber
Technology Company - Wolbrom
1
2
3
4Effect of moulding pressure Mould construction
Processing conditions:Moulding temperature : 180 o CMoulding
time : 15 min (starting from hot moulds)Moulding pressure:
variable
Effect of moulding pressure on the granulate (1-2 mm)
parametersMeasured parameters:Hardness Thickness Tensile strength
Elongation at break Density
The materials (rubber granulate and buffing) were direct moulded
in plates of 150mm x4 mm before obtaining dog-bone
specimens.Details for specified tests Test method Relevant
standard
Device modelDevice photoHardness (Shore A)
PN-80/C-04238Zwick digital Shore hardness testersTensile
strength and elongation at break
PN-ISO 37Testing Machine ZMGI 500Thickness
PN-ISO 37Thickness gage Sylvac 25mm/0,001Density
PN-ISO 2781+AC1Analytical balance WAS 136/C/2Density
determination kit
Change of the tensile strength [MPa]Change of the elongation at
break [%]Change of the hardness [oShA]Change of the density [
g/cm3]Change of the thicknessEffect of moulding pressure on the
granulate (1-2 mm) all samples
Effect of the presence of moisture in the rubber powder samples
thickness ~ 20 mm
Rubber powder was dried under different conditions:180 C x 30
min - on the press plate 150 C x 60 min - on the press plate 120 C
x 90 min - in a dryer
Blisters are present in all samples.
Mixing different types of granules in one sample
Upper layer powder 0-0.8 mm* (3 mm thickness)Lower layer
granulate 1-2 mm (15 mm thickness)
* The rubber powder was undried. The surface is smooth and don't
have blisters.Another experimentsProcessing conditions:Moulding
temperature : 180 o CMoulding time : 15 min (starting from hot
moulds)Moulding pressure: 3,2 MPa Plates dimension: 120 x 90 x 4
mm*
*unless otherwise noted
Mould construction:
Effect of the presence of moisture in the rubber powder*
(0-0,8mm)No blisters
No blisters*Samples dimension: 120x90x2Effect of the presence of
moisture in the rubber powder* (0-0,8mm)*Samples dimension:
120x90x2Comparison all tested granulatesAll samples were made by
using direct moulding.Modification of surface granulates (1-2 mm)
by addition:Curing system (vulcanising agent,
accelerator)SulphurTMTDZinc stearatePlasticisersParaffinic
oilAromatic oil Machine oilSolventsWaterExtraction gasolineResin
(other than polyurethane binder)novolac
Modification by sulphur - influence increase the percentage of
sulfurModification by TMTD and sulphur/TMTD (5:1) Modification by
zinc stearateModification by plasticisersModification by
solventsModification by novolac (resin)Recycled rubber products
were made by using of polyurethane binder.Processing conditions
Moulding temperature : 90 o CMoulding time : 7 min (starting
from hot moulds)Moulding pressure: 3,2 MPa Plates dimension: 120 x
90 x 4 mmPolyuretane binder content : 6 wt %Rubber plates were
moulded by using:
Rubber granulate(powder) 0-0,8 mmRubber granulate 1-2 mmRubber
granulate 1-4 mmRubber buffing
Comparison all tested samples were obtained by using of
polyurethane resinComparision of samples ( similar density
1.12-1.15g/cm3)
