Recycling of SUMIKAEXCEL PES

When mixing recycled pellets into virgin pellets, it is necessary to adjust the mixing ratio in accordance with the grade and the application.
Possible recycled pellet mixing ratios for each grade are shown in Table 1.

Table 1 Recommended Mixing Ratios for Recycled Pellets

Grade Mixing Ratio for Recycled Pellets (%)
4100G / 4800G 30 or less
3601GL20 / 4101GL20 20 or less
3601GL30 / 4101GL30 10 or less

In non-reinforced grades, the use of excessive amounts of recycled pellets will cause stronger coloration of molding and will tend to make molding crumble more easily. As well, in glass fiber reinforced grades, the recycling process shortens the lengths of the glass fibers, resulting in molding with somewhat degraded mechanical strength. Therefore, the percentage of recycled resin must be limited. Table 3-19 indicates the recycling repetitions (number of times recycled) and subsequent changes to the tensile properties.

Table 2 Recycling Repetitions and Tensile Properties of Non-reinforced Grades and Glass Fiber Reinforced Grades

Grade 4100G / 4800G 3601GL20 / 4101GL20
Recycled Pellets Ratio 30 100 30 100
Physical Properties Tensile
Strength
(MPa)
Rupture
Status
Tensile
Strength
(MPa)
Rupture
Status
Tensile
Strength
(MPa)
Tensile
Strength
(MPa)
Tensile
Strength
(MPa)
Rupture
Status
Number of
Recycling
Repetitions
Virgin 86 Ductile 86 Ductile 126 Ductile 126 Ductile
1 87 Ductile 87 Ductile 126 Ductile 121 Ductile
2 89 Ductile 87 Ductile 125 Ductile 116 Ductile
3 88 Ductile 87 Ductile 126 Ductile 109 Ductile
4 88 Ductile 88 Ductile 124 Ductile 102 Ductile
5 89 Ductile 87 Ductile 122 Ductile 98 Ductile
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