Hot runner nozzle - Günther Heisskanaltechnik ...

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Hot runner nozzle Without extended nozzle tip With extended nozzle tip +0.02 L Shimmed Inserted +0.02 L1 Fig. Use of nozzle with extended tip Fig. Side gating under 90° without a “cold slug” www.guenther-hotrunner.com 4/11 Subject to technical changes +0.02 L1 +0.02 L1 +0.02 L1 iT Extended nozzle tips in connection with the material It is often necessary to use several different nozzle lengths when gating a part. Extended nozzle tips allow sprueless molding of parts even in space constrained environments. Side gating Under 90° without a ”cold slug” in combination with a manifold. Gating should always be against the core. Always specify the material to be processed and the part weight when making inqiries. Also specify whether a part is to be gated with several tips, or if several parts are to be molded. Note: Slide out the inserts only horizontally! 1.4. 36
Valve gate technology Fig. Valve gate system Commissioning the valve gate system Before heating the nozzles and the manifold, switch on the mould temperature control. Heating the hot-runner system: - Heat the manifold with the controller unit's soft start function. With the softstart function the manifold is heated to about 100°C and held at this temperature for approximately 10 minutes. - The nozzles and manifold must be heated evenly. Heating the manifold to the target temperature can take up to 20 minutes. The needle mechanism may be put into operation when the hot-runner system reaches production temperature. The idle system must be held at production temperature for at least 10 minutes to ensure thermal stability. When putting into operation for the first time, several injections may be necessary in order to fill the hot runner completely with plastic. Until the parts are filled completely, the cavities must be checked after every cycle for parts that have not been filled completely. If the process is interrupted, the hot-runner temperature must be lowered (depending on the material and downtime by 100…150°C). The needles must be in the "closed" position. To prevent damage being caused to the gate bores / valve needles by cold material, the valve needles may not be actuated when the injection moulding machine is being set up or during injection out through the unit. If the melt is to be injected out through the open mould / hot runner, the needles must be opened during the injecting-through process and closed during the dosing phase. www.guenther-hotrunner.com 4/11 Subject to technical changes When the hot-runner system is being turned off, all control circuits can be turned off at the same time. To prevent the hot-runner system being damaged by the build-up of heat, let the mould cooling run on at about 30°C for another 30 minutes approximately. The valve gate needles should be in the “closed” position here. Before doing any disassembly, make sure the hot runner is switched off. To prevent damage to the needle guide / needle, the needles must be in the opened position. Before putting the system into operation again, make sure the needles are in the “closed” position again. Connection values Electric Voltage 230 V~ System * max. permissible operating pressure in the hot-runner system 2000 bar * Hydraulic Single valve- gate nozzle Lifting plate mechanism Sliding cam mechanism Pneumatic max. permissible operating pressure in the hot-runner system Single valve gate nozzle Single needle valve Lifting plate mechanism Sliding cam mechanism iT If special nozzles or other components with a pressure limit (less than 2000 bar) are fitted to systems or individual tools, this situation is documented in the height adjustment and on the type plate. To attain the right needle speed (needle closing time 20- 40 ms / 7-10 mm travel), the valve must be designed to be large enough for the actuation (hydraulic/pneumatic). The connection hoses too must be dimensioned to suit the flow volume. The distance between the pressure generation and the pressure consumption (mould) should be as small as possible. Note! The first filling of the hydraulic cylinders should be done at a low speed or the cylinders should be deaerated. 40 40-60 40-60 8 mind. 8-10 8 8-10 8-10 bar bar bar bar bar bar bar bar 1.4. 40
Page 1 and 2: Index Materials 3 Reference values
Page 3 and 4: Materials Reference values for maxi
Page 5 and 6: Materials Determining the gate diam
Page 7 and 8: Materials Material PP PE PS ABS SAN
Page 9 and 10: Gating Fig. Gate geometry H [mm] 4,
Page 11 and 12: Gating 0.5 At 250°C the hot runner
Page 13 and 14: Tempering 1.4. 21 iT Fig. Reserve g
Page 15 and 16: Thread designation Regular type scr
Page 17 and 18: 1.4. 33 iT Thickfilm heaters for ho
Page 19: 1.4. 35 iT Assembly of the star man
Page 23 and 24: Valve gate technology Lifting plate
Page 25 and 26: Hot runner systems / manifolds www.
Page 27 and 28: Hot runner systems / manifolds Air
Page 29 and 30: Hot runner systems / manifolds Mani
Page 31 and 32: Hot runner systems / manifolds Comp
Page 33 and 34: Fig. Delta Tool calculation program
Page 35: Fig. Seminars for designers and use

Hot runner nozzle - Günther Heisskanaltechnik ...

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