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Synventive Molding Solutions
Sprue Bushing / Single Nozzle SB24

Sprue Bushing / Single Nozzle SB24

Product catalog summary

Overview
Synventive SB24 hot sprue bushings are designed for high-capacity molding applications, suitable for large shot and viscous materials. They are available in two styles: band heated for bushings with an "A" length of less than 380mm, and tubular heated for bushings with an "A" length greater than 220mm.

Specifications

Max. Operating Pressure: 20,000 psi (1400 bar)
Max. Operating Temperature: 650°F (345°C)
Mode of Operation: Horizontal
Heater: 57mm I.D. x 63.5mm wide, 1,000 W, 120 or 240 V
Heater Clearance Diameter: 95 mm for heater band

SB24B Hot Sprue Bushings
These bushings are equipped with band heaters and are ideal for mold depths between 140mm and 380mm. They include mineral insulated heater bands or high-reliability tubular heaters, thermocouples, and support ring assembly.

SB24T Hot Sprue Bushings
These bushings use tubular heaters and are suitable for mold depths between 220mm and 850mm. They include highly reliable tubular heaters, thermocouples, and support ring assembly.

Ordering Information
When ordering, specify the "A" dimension for mold depth, desired tip style (CV-10 or CV-20), and additional requirements such as material type and orifice diameter. Special orders can be made for 420 SS bushings for processing corrosive materials.

Tip Styles

CV-10: Gate/Full Flow
CV-20: Open/Full Flow

Each tip style has specific applications and requirements for optimal gate control.

Material Compatibility
The bushings are compatible with a wide range of materials, including ABS, Acetal, Acrylic, Nylon, Polycarbonate, Polyester, Polyethylene, Polypropylene, and more. Some materials require specific tip styles or additional considerations.

Accessories
Synventive offers a range of accessories, including replacement band heaters and thermocouples, as well as single and multi-zone temperature control systems.

Tip Removal/Replacement
Tip Removal:
1. Use a 36mm 6-point deep socket wrench to remove the tip. If the tip is stuck, heat the bushing to the operating melt temperature.
Insert Removal:
1. Remove the conductive BeCu insert only if replacing it. Reinstallation may affect heat transfer.
2. Drill into the insert center with an 11.1mm diameter drill to a depth of 15mm, then thread with an M12 tap.
3. Use an M12 rod and removal tool to extract the insert.
Tip Replacement:
1. Clean plastic from the SYNVENTIVE-SEAL and tip sealing diameter.
2. Apply blueing to verify seating between the tip and body.
3. Ensure the SYNVENTIVE-SEAL is in place before installation.
4. Torque the tip to 48 kg.M (350 ft.lb).
Insert Replacement:
1. Clean plastic from the insert counter bore and measure diameters.
2. The insert should be .013-.030mm larger than the counter bore for proper heat transfer.
3. Press the insert so the shoulder is flush with the tip seat using an installation tool and arbor press.
SYNVENTIVE-SEAL Replacement:
Inspect the SYNVENTIVE-SEAL for damage or plastic leakage. Use a removal tool to avoid scratching. Replace only on a smooth, plastic-free sealing diameter using a light arbor press.

Catalog excerpts

Hot Sprue Bushings Products/Technical Guide >

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1.Cold bushing length must allow for thermal expansion to fit specified mold length.Allow .003 x ("A") for thermal expansion of bushing.2.All dimensions are in mm. 3.420 SS bushings are available on special order for processing PVC or other corrosive materials. >

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Notes > SB24B Band Heater Bushing (metric) Gate Full Flow CV-10Gate Orifice3.0 8.5 (.125֔ .335֔) 7 of 17 size="-3">

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SB24T Tubular Heater Bushing (metric) Notes > Gate Full Flow CV-10Gate Orifice3.0 8.5 (.125֔ .335֔) 8 of 17 size="-3">

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Notes > SB24B Band Heater Bushing (metric) Gate Full Flow CV- 20Gate Orifice3.0 8.5 (.125֔ .335֔) 9 of 17 size="-3">

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SB24T Tubular Heater Bushing (metric) Notes > Open Full Flow CV- 20Gate Orifice3.0 8.5 (.125֔ .335֔) 10 of 17 size="-3">

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MATERIALSynventive Hot Sprue BushingsUSB5*,SB5*,USB8,SB8,SB13,SB15 & SB24** > GR-Glass ReinforcedNR-Not Recommended for Most ApplicationsRecommended Tip/Bushing1.Most Suitable 2.Suitable with some reservations: e.g.Gate Control,etc. (Not as good as category 1) See page 24 for correct Orifice Sizing*USB5 & SB5 Bushings are NR-For Glass Filled Materials.**SB24 Bushings are available with CV-10 & CV-20 tips only.***See Orifice Diameter Requirements,page 24. Synventive Tip Styles > CV-10CV-11CV-20CV-21 ABS1111 ABS GR ***1212 ACETAL (POM)NR1NR1 ACETAL GR1212 ACRYLIC1111 LCPNR1NR1 PPO1111 NYLON 6 ***NR1NR1...

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This is the most widely used tip. This tip style is used primarily to provide Vestige height is equal to orifice diameter. reduced vestige height,0.4- 0.9mm high Provides best gate control for for all materials. most materials. Cone Point adds heatto center of orifice for Open flowbore provides lowpressure drop. nylon,acetal and PBT. Tramp metal can usually flow through tip. Orifice adjustment requires added Orifice is increased by simple straight reaming of diameter. machining to hold land length at0.08/0.13mm. > Same as CV-10 except gate orifice is > Same as CV-11 except gate orifice is machined...

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Single Zone 15 Amp Temperature Controller includes one thermocouple connector (80-M2MJ)CatalogAmp/Voltage Input OutputNumberconnectorconnector Catalog No.*Catalog No.*80-PIM1A1515A/240V80-AC1524F 80-AC1524M (NEMA 6-15)(NEMA 6-15)80-PIM1A15115A/120V80-AC1512F 80-AC1512M(NEMA 5-15)(NEMA 5-15) > Synventive offers a complete line of single and multi-zone temperature control systems.For details,see Temperature Control SystemsDesign Manual. 16 of 17 size="-2">

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Tip Removal > 1.Place a 36mm 6 point deep socket wrench over split wrench.Torque off tip with wrench assembly.See Figure 1.2.Tips are usually removed at room temperature.If tip does not break free,heatbushing to operating melt temperature. Insert Removal > 1.The conductive BeCu insert should only be removed if it is to be replaced by anew insert.Reinstallation of the same insert may affect the heat transfer from the steel body to the BeCu insert.2.Using an 11.1mm dia.drill,machine into the center of the insert for a depth of15mm,and then thread using a M12 tap.3.After the insert is tapped,thread...

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Sprue Bushing / Single Nozzle SB24

Sprue Bushing / Single Nozzle SB24

Catalog excerpts

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