June 1, 2018
June 2018
Summer is right around the corner and many plastic molders will have a summer shut down as a time for refreshing and recharging for most people. However, for the people that keep the tools running that make the plastic parts, this is the time to schedule tool repair, so the tools will operate within optimum parameters. Included in the repair of the tools is the inspection and or replacement of the hot runner components.
Evaluation of the nozzles and internal components.
It is important to use a propane torch and not a MAPP torch because the hotter MAPP torch will overheat the spring and cause fatigue and failure. On an NH series nozzle, once you have removed the internal components from the nozzle body, separate the torpedo front, piston, spring and torpedo rear. Using a heavy-duty plastic scouring pad (Scotch Brite) or fine emery cloth, polish the surfaces of these internal components. Once clean, you can inspect the piston, torpedo front and rear for cracks or other defects, replace if necessary. For the spring, measure the length with a set of calipers. If you have an NH2 series nozzle, the standard force spring should measure a minimum of 18mm, the strong force spring should measure a minimum of 19mm. For the NH4 series, the standard force spring should measure a minimum of 22mm, the strong force spring should measure a minimum of 24mm. If the measurements are less than the minimum recommended length, the spring should be replaced.
Evaluation of the heaters and thermocouples.
Ring and cartridge heaters should be examined for frayed wiring, damage to the metal case, and loss of the wire seal on cartridge heaters. Frayed insulation may be repaired with high temperature electrical tape. If the conductor wire or metal case is damaged, the heater should be replaced. Thermocouple examination is for frayed insulation, kinks and crushed areas on the metal sheath. As with the heaters, frayed insulation may be repaired with high temperature electrical tape. A thermocouple with kinks or crushed metal sheath should be replaced.
Reassembly of the nozzles.
Upon reassembly on the nozzle, I would highly recommend replacing the PS157 seal ring to reduce the possibility of leakage between the nozzle and the flange. I would also like to offer the FISA nozzle refurbishment service as an option, if you would like to send us your nozzles, recommended for AH series nozzles as the piston is more venerable to damage with improper removal. We will disassemble, clean and evaluate the components. We will send you a report of our evaluations along with a quote for the parts that need to be replaced. If you decide to send us a PO to cover the refurbishment, we will reassemble your nozzles to optimum condition and return to you. If you decide not to send us a PO, we will send the components back to you. We do have an extensive inventory of all standard components in stock at our corporate headquarters in Shelbyville, Tennessee and we can ship 1-day ARO.
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Mark Gilley
(931) 684-9433
sales@fisacorp.com
Evaluation of the nozzles and internal components.
It is important to use a propane torch and not a MAPP torch because the hotter MAPP torch will overheat the spring and cause fatigue and failure. On an NH series nozzle, once you have removed the internal components from the nozzle body, separate the torpedo front, piston, spring and torpedo rear. Using a heavy-duty plastic scouring pad (Scotch Brite) or fine emery cloth, polish the surfaces of these internal components. Once clean, you can inspect the piston, torpedo front and rear for cracks or other defects, replace if necessary. For the spring, measure the length with a set of calipers. If you have an NH2 series nozzle, the standard force spring should measure a minimum of 18mm, the strong force spring should measure a minimum of 19mm. For the NH4 series, the standard force spring should measure a minimum of 22mm, the strong force spring should measure a minimum of 24mm. If the measurements are less than the minimum recommended length, the spring should be replaced.
Evaluation of the heaters and thermocouples.
Ring and cartridge heaters should be examined for frayed wiring, damage to the metal case, and loss of the wire seal on cartridge heaters. Frayed insulation may be repaired with high temperature electrical tape. If the conductor wire or metal case is damaged, the heater should be replaced. Thermocouple examination is for frayed insulation, kinks and crushed areas on the metal sheath. As with the heaters, frayed insulation may be repaired with high temperature electrical tape. A thermocouple with kinks or crushed metal sheath should be replaced.
Reassembly of the nozzles.
Upon reassembly on the nozzle, I would highly recommend replacing the PS157 seal ring to reduce the possibility of leakage between the nozzle and the flange. I would also like to offer the FISA nozzle refurbishment service as an option, if you would like to send us your nozzles, recommended for AH series nozzles as the piston is more venerable to damage with improper removal. We will disassemble, clean and evaluate the components. We will send you a report of our evaluations along with a quote for the parts that need to be replaced. If you decide to send us a PO to cover the refurbishment, we will reassemble your nozzles to optimum condition and return to you. If you decide not to send us a PO, we will send the components back to you. We do have an extensive inventory of all standard components in stock at our corporate headquarters in Shelbyville, Tennessee and we can ship 1-day ARO.
Please like Us on Facebook at FISA Corporation
Mark Gilley
(931) 684-9433
sales@fisacorp.com