Semi-finished products Plastic granules Special compounds

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Post heat treatmentThe plastic is subjected to a heat treatment, and it will be quoted as annealing. The annealing target is to reducethe tension and increase the crystallinity of the component. All the ZEDEX ® high performance plastics are annealtreated, in order to reduce the processing-related inner tension. When the interference-fit temperature of pressedplain bearing bushes should be increased, two annealing at the operating temperature range are advisable. However,the admissible long-term service temperature can not be exceeded.When is an annealing processadvisable?In the following cases, we suggest an additionalannealing process and / or an intermediate annealingbetween machining and the final machining:– when tight tolerances are required– when an asymmetrical material removal or a bigchip removal is required– with a big walls´ thickness variation on the endproducts– when sharp corners and edges must be machined– when the end product have got a cross-section discontinuityRealization of the annealing processThe annealing should take place in a circulating airdrying oven. The temperature in the oven follows aramp function (see figure 3). The heating rate is20 °C per hour, whereas the cooling rate 10 °C perhour. Higher heating and cooling rates should beavoided. The holding period depends on the maximumwall thickness of the workpiece and can be takenholding temp.final temp.room temp.furnace temperature[°C]Heating ramp rate= max. 20°C / hCooling ramp rate= max. 10°C/hheating time holding timecooling timeFigure 3: annealing ramp ratetime [h]from the figure 4. The holding temperarture dependson the material and can be taken from the table 2(page 23). The annealing process is completed, whenthe final temperature is reached. From this point on,the oven can be turned off. The workpiece should beremoved from the oven only when its temperaturematches with the room´s one.Hints regarding the annealing processAn adequate large allowance must be provided beforeannealing. The use of a support during the annealingprocess reduces deflection and deformation.The annealing process could form oxide layers on thesurfaces, thus their colour affect. These layers reach,in the semi-finished products, a maximum thicknessof 0,2 mm, and, normally, they are removed throughmachining.holding time [h/mm]504540353025201510500 50 100 150 200 250 300diameter - thickness [mm]Figure 4: holding time related to material thickness22 ZEDEX ® basic types ZEDEX ® families Post heat Machining ShippingtreatmentoverviewSterilizationChemicalresistance
TensionsProcessing (extrusion and injection moulding) inducestechnologically the chains orientation, generatedin the polymers structure. The plastic structure, afterthe melding process, starts to solidify in a “forcedposition”, which causes a strong restoring force andproduces an internal tension in the plastic. Now ifadditional external stresses are added, e.g. throughmachining, the overlapping of the internal and externalstresses, could overstep the material strengthresistance and create tears and even the break of thesemi-finished products.distortion temperature, the chains mobility increasesand the stress relaxation accelerates. In this case,the stress relaxation and the associated warping arefaster and more intensive. If the semi-finished productsare subjected to a annealing process, the warpingis partially anticipated.Stress relaxation, warpingSemi-finished and end-products, during a long-termstorage, reduce the existing tensions, thanks to thestress relaxation. Besides, the tensions are reducedbecause of the warping effect. This can also ariseduring the use of the end-product. Through a plasticstorage, with a temperature closed to the heatAnnealing to reduce tensionsMaterialidentificationMax. heatingramprate[°C / h]Holdingtemperature[°C]Max. coolingramprate,[°C / h]Cooling to[°C]StructureCold crystallizationtemperature[°C]ZX-100K 20 150 10 40 semi-crystalline > 140ZX-100EL55/63 20 50 10 40 semi-crystalline -ZX-100MT 20 150 10 40 semi-crystalline > 140ZX-324 20 250 10 60 semi-crystalline > 300ZX-324V1T 20 250 10 60 semi-crystalline > 300ZX-324V2T 20 250 10 60 semi-crystalline > 300ZX-324V11T 20 250 10 60 semi-crystalline > 300ZX-324VMT 20 250 10 60 semi-crystalline > 300ZX-410 20 200 10 60 amorphous -ZX-410V7T 20 200 10 60 amorphous -ZX-530 20 160 10 40 semi-crystalline > 110ZX-530CD3 20 160 10 40 semi-crystalline > 110ZX-530EL3 20 160 10 40 semi-crystalline > 110ZX-530KF15 20 160 10 40 semi-crystalline > 110ZX-550 - - - - semi-crystalline -ZX-550PV - - - - semi-crystalline -ZX-750V5T 20 265 10 60 semi-crystalline 290ZX-750V5KF 20 265 10 60 semi-crystalline 290Table 2: annealing parametersZEDEX ® basic types ZEDEX ® families Post heat Machining ShippingtreatmentoverviewSterilizationChemicalresistance23
Page 1 and 2: ZEDEX ®Tribological Polymer Soluti
Page 3 and 4: Stamping (Hot forming) . . . . . .
Page 5 and 6: Thermal limitation usage of ZEDEX
Page 7 and 8: Comparison of the relative characte
Page 9 and 10: SubstitutionexamplesWhich material
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Page 14 and 15: Application with chemicals ZX-530 f
Page 16 and 17: Low friction ZX-550 familyBasic typ
Page 18 and 19: Long-term up to 300 °C ZX-750 fami
Page 20 and 21: Comparison table of the ZEDEX ® ma
Page 24 and 25: Degree of crystallinitySemi-crystal
Page 26 and 27: Machining guidelineZX-100KZX-100EL6
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Semi-finished products Plastic granules Special compounds

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