Heatlock ESB2, Electric Sprue Bushing

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This Heatlock series, below, is currently being replaced by the A1-series of nozzles. Before you design check availability, stock is gradually decreased. Spare parts will be available until at least end of 2007 (apart form NPT1 bodies) Length of the bushing. When fitting the bushing into the mould it is essential to bear in mind that its length increases when it get hot. Approx. elongation of bushing at 200 ϒC L26 L46 L66 L86 L106 L136 approx 0,10 mm approx 0,17 mm approx 0,22 mm approx 0,27 mm approx 0,30 mm approx 0,39 mm The front surface of the bushing must not come into contact with the moving mould half. Bushings with extra stock must be used when any kind of contour is needed at the front end. This is how it should be done. It is not recommended to shorten the bushing below the ”L” 0,25-0,5 3 2 5 ”L” Ø12 R=1 ØD Gate on surface not perpendicular to bush. Gate on runner ØD(D+4) measurment. Front diameter of the bushing may be reduced to be as small as possible considering size of the gate. The wall thickness at the front end shall not be less then 2 mm. A small front diameter of the sprue bushing gives: Size of gate - less contact area between bushing and mould with a more even temperature along the bushing as a result. - the force that will push the bushing out of the mould will be reduced. Shot weight per nozzle grams Gate diameter 1. Low viscosity PS, PE, PP. 2. Medium viscosity ABS, SAN, PA, POM. 3. High viscosity PC, PMMA, Noryl, PUR, reinforced plastics. On delivery is the gate 2 mm. Outward cone is 1,5ϒ per side. It may be reamed out to 5 mm if necessary. The diagram above gives a guideline figure for the gate diameter needed for different plastics and shot weights. Note: If the gate diameter is too small, an unnecessarily high bushing temperature will have to be set for the gate not to freeze between shots. © LKM Heatlock Co Ltd Date: 050326, © Heatlock AB Appendix – 9
This Heatlock series, below, is currently being replaced by the A1-series of nozzles. Before you design check availability, stock is gradually decreased. Spare parts will be available until at least end of 2007 (apart form NPT1 bodies) The suggested figures are approximate. Gate dimension may be influenced by the shape of the article and the design of the mould etc. The balance between shot weight, injection rate, tool temperature, temperature pattern opposite gate, cooling around gate and injection pressure are all factors that affect gate size.A small gate freezes quicker than a large gate. On injection moulding with very short cycle times and short injection times, it may be necessary to design gate cooling so that it does not overheat. If the sprue bushing is feeding a runner which has a gate into a cavity, it may be suitable to make bushing gate larger then actually necessary. This way pressure drop and shear will be reduced. If an electric sprue bushing is used to feeding a runner this means that length of flow in cold steel has been reduced equivalent to bushing length. Due to this cross section of the runner can be made smaller then usually. This may be important in order to get shortest possible cycle time. Begin with a smaller gate than indicated by the table. Instructions for changing the coilheater or thermocouple. Disassembly Assembly. 1. Take off the reflector (aluminium tube) 2. Unscrew the screws at the rear end. 3. Take off the flange. 4. Take of the lock ring at the front end. 5. Take off the spring that keeps thermocouple in place. 6. Take off the tape that keeps heater and thermocouple extensions together. 7. Depending on how hard spiral heater fits the pipe it can either be pulled of or ”unscrewed”. Unscrewing works easily if you push on the spiral heater extension which will open the spiral while at the same time opening the spiral at the other end with a suitable tool. The thermocouple must not follow if the spiral element is rotated or pulled off, since it may break.Treat thermocouple with great care. The tube is only 1 mm diameter. To be done in opposite order to disassembly. If a new thermocouple is to be fitted it must be bent to fit the bushing. The tip of the thermocouple must be located where the groove ends, i.e. about half-way along the tube. Min. bending radius 3 mm. Tighten the element so that the heating spiral makes contact with the tube. If you have any questions about installing the bushing, please get in touch with us. ESB2 Box 236 S–532 23 Skara Phone: +46 511-13200 e-mail: hot.runner@heatlock.se Fax: +46 511-17285 Homepage: http://www.heatlock.se Heatlock AB 97.06 / ESB2.mont Appendix – 10 Date: 050326, © Heatlock AB © LKM Heatlock Co Ltd
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Heatlock ESB2, Electric Sprue Bushing

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