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1、 DuPont Engineering Polymers Blow Moulding Processing Manual Start with DuPont Engineering Polymers DuPont registered trademark Blow moulding processing manual Table of contents 1 DuPont resins for blow moulding . 3 1.1 Why blow mould engineering resins. 3 1.2 ZYTEL nylon resins for blow moulding. 3
2、 1.3 HYTREL and CRASTIN polyester resins for blow moulding. 4 2 Description of blow moulding processes. 7 2.1 General. 7 2.2 Continuous extrusion machines. 7 2.3 Accumulator head machines . 7 2.4 Co-extrusion and sequential 3-D blow moulding. 7 2.5 Injection blow moulding . 9 3 The blow moulding mac
3、hine - Important considerations. 11 3.1 Screw and barrel design. 11 3.2 Manifold/adapter design. 11 3.3 Accumulator and continuous extrusion head design . 12 3.4 Die/head tooling design . 12 3.5 Parison cutters . 13 3.6 Mould clamping force . 13 3.7 Temperature control. 13 3.8 Auxiliary equipment. 1
4、3 4 Machine operating conditions . 15 4.1 Quick reference - Processing conditions . 15 4.2 Barrel temperatures . 15 4.3 Adapter, head and die temperature. 16 4.4 Accumulator push-out pressures and speeds. 16 4.5 Parison programming . 16 4.6 Mould temperature . 17 4.7 Start-up procedures. 17 4.8 Purg
5、ing and shutdown. 17 4.9 Secondary operations: trimming, welding . 18 4.10 Special conditions for injection blow moulding and Pressblower operation . 19 5 Handling of blow moulding resins . 21 5.1 Effects of moisture . 21 5.2 Drying. 22 5.3 Regrind . 22 5.4 Bulk storage. 23 6 Mould design guidance .
6、 25 6.1 General. 25 6.2 Materials of construction. 25 6.3 Blow-up (draw) ratio. 25 6.4 Mould shrinkage allowances and part dimensions. 25 6.5 Pinch-off designs. 25 6.6 Other mould considerations. 26 7 Troubleshooting guide . 27 1 1 1.1 DuPont resins for blow moulding Why blow mould engineering resin
7、s? ZYTEL blow moulding resins ZYTEL BM7300THS Unreinforced PA6 There are many reasons why engineering resins have become established in blow moulding applications, for example: Cost and weight reduction Recyclability ( replaces rubber for example) Innovation: - Multifunctional parts - Reduce number
8、of parts in the engine compartment Higher temperature requirements Easier assembly and disassembly Reduce number of materials Improve performance Reduce noise Availability of special resin grades designed for blow moulding DuPont offers a wide range of engineering resins types for blow moulding incl
9、uding: HYTREL CRASTIN ZYTEL SELAR RB Polyester elastomer PBT polyester Nylons 6, 66, and alloys Barrier resin ZYTEL BM73G25THS 25% glass reinforced PA6 ZYTEL BM73G15THS 15% glass reinforced PA6 ZYTEL BM7300FN ZYTEL CFE8005HS ZYTEL EFE7340 ZYTEL EFE7341 Unreinforced, PA6 flexible nylon alloy Unreinfo
10、rced PA66 15% glass reinforced hydrolysis resistant PA66 20% glass reinforced hydrolysis resistant PA66 New grades are continuously being developed, so please contact your local DuPont representative for the latest product literature. All DuPont resins are supported by comprehensive Technical Service in the areas of: Basic data Design
