[{"data":1,"prerenderedAt":775},["ShallowReactive",2],{"catalog:meta":3,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle:*":258,"guides:topics:barrel-screw:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle:path,title,short":540,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw:diagram":593,"diagram:id:injection-unit":594,"catalog:parts::MC-BC-07":767},{"categories":4,"machines":132,"zones":212,"totals":255},[5,35,59,122],{"id":6,"name":7,"slug":8,"description":9,"partCount":10,"subcategories":11},"EC","Electrical Components","electrical","Electrical systems and components for injection molding machines including heaters, thermocouples, servo motors, and controllers.",11,[12,17,22,27,31],{"id":13,"name":14,"slug":15,"partCount":16},"EC-CBC","Circuit Boards & Controllers","circuit-boards",4,{"id":18,"name":19,"slug":20,"partCount":21},"EC-CE","Connectors & Cables","connectors-cables",2,{"id":23,"name":24,"slug":25,"partCount":26},"EC-GEP","Servo Motors & Drives","servo-motors",1,{"id":28,"name":29,"slug":30,"partCount":21},"EC-HT","Heaters","heaters",{"id":32,"name":33,"slug":34,"partCount":21},"EC-SF","Safety Components","safety",{"id":36,"name":37,"slug":38,"description":39,"partCount":40,"subcategories":41},"HY","Hydraulic Components","hydraulic","Complete range of hydraulic system components including pumps, valves, motors, and pressure controls for injection molding machines.",14,[42,46,51,55],{"id":43,"name":44,"slug":45,"partCount":26},"HY-AU","Accumulators","accumulators",{"id":47,"name":48,"slug":49,"partCount":50},"HY-CV","Control Valves","control-valves",6,{"id":52,"name":53,"slug":54,"partCount":26},"HY-MO","Monitors & Gauges","monitors-gauges",{"id":56,"name":57,"slug":58,"partCount":50},"HY-PW","Pumps & Motors","pumps-motors",{"id":60,"name":61,"slug":62,"description":63,"partCount":64,"subcategories":65},"MC","Mechanical Components","mechanical","Mechanical parts and assemblies including barrels, screws, tie bars, bushings, platens, and clamping components.",42,[66,71,75,80,85,89,93,97,101,105,109,114,118],{"id":67,"name":68,"slug":69,"partCount":70},"MC-BC","Barrels & Cylinders","barrels-cylinders",5,{"id":72,"name":73,"slug":74,"partCount":16},"MC-SB","Screw Barrels & Seals","screws",{"id":76,"name":77,"slug":78,"partCount":79},"MC-TC","Tie Bars & Columns","tie-bars",7,{"id":81,"name":82,"slug":83,"partCount":84},"MC-GZ","Bushings & Guides","bushings-guides",8,{"id":86,"name":87,"slug":88,"partCount":26},"MC-PP","Platens","platens",{"id":90,"name":91,"slug":92,"partCount":70},"MC-TL","Toggle & Links","toggle-links",{"id":94,"name":95,"slug":96,"partCount":21},"MC-CC","Clamping Components","clamping",{"id":98,"name":99,"slug":100,"partCount":21},"MC-GMP","Tools & Accessories","tools-accessories",{"id":102,"name":103,"slug":104,"partCount":21},"MC-ES","End Caps & Plates","end-caps",{"id":106,"name":107,"slug":108,"partCount":26},"MC-SR","Seals & Rings","seals-rings",{"id":110,"name":111,"slug":112,"partCount":113},"MC-JM","Joints & Mounts","joints-mounts",3,{"id":115,"name":116,"slug":117,"partCount":26},"MC-SG","Safety Guards","safety-guards",{"id":119,"name":120,"slug":121,"partCount":26},"MC-CR","Clamping Mechanism","clamping-mechanism",{"id":123,"name":124,"slug":125,"description":126,"partCount":113,"subcategories":127},"O","Other Components","other","Additional components including filters, cooling systems, lubrication parts, and other auxiliary equipment.",[128],{"id":129,"name":130,"slug":131,"partCount":113},"O-TC","Filters & Cooling","filters-cooling",[133,143,161,172,180,188,194,200,205],{"id":134,"name":135,"slug":134,"series":136,"partCount":142},"haitian","Haitian International",[137,138,139,140,141],"Mars Series (MA)","Jupiter Series (JU)","Zhafir Venus Series (VE)","Zhafir Zeres Series (ZE)","Zhafir Jeres Series (JE)",68,{"id":144,"name":145,"slug":144,"series":146,"partCount":160},"yizumi","Yizumi",[147,148,149,150,151,152,153,154,155,156,157,158,159],"A6 Series","A5-EU Series","A5-N Series","SKIII Series","DP Series","D1 Series","FF Series","FF-M Series","P Series","CG-P Series","VM Series","SPET Series","LSR Series",12,{"id":162,"name":163,"slug":162,"series":164,"partCount":171},"chen-hsong","Chen Hsong",[165,166,167,168,169,170],"JETMASTER MK Series","JETMASTER SVP Series","SUPERMASTER Series","EASYMASTER Series","SPARK Series","JETMASTER C2 Series",10,{"id":173,"name":174,"slug":173,"series":175,"partCount":179},"tederic","Tederic",[176,177,178],"NEO Series","D Series (Two-Platen)","DE Series (All-Electric)",0,{"id":181,"name":182,"slug":181,"series":183,"partCount":179},"borch","Borch",[184,185,186,187],"BU Series (Two-Platen)","BS-III Series (Servo)","BE Series (All-Electric)","BM Series (Multi-color)",{"id":189,"name":190,"slug":189,"series":191,"partCount":179},"log-machine","LOG Machine",[192,193],"LOG-SE Series","LOG-EE Series (All-Electric)",{"id":195,"name":196,"slug":195,"series":197,"partCount":179},"donghua","Donghua",[198,199],"DH Series (Servo)","DH-TP Series (Two-Platen)",{"id":201,"name":202,"slug":201,"series":203,"partCount":179},"sunbun","Sunbun",[204],"Sunbun Servo Series",{"id":206,"name":207,"slug":206,"series":208,"partCount":179},"lijin","L.K. Machinery (Lijin)",[209,210,211],"POTENZA Series","FORZA Series (Two-Platen)","ELETTRICA Series (All-Electric)",[213,217,221,225,228,231,235,238,242,248,251],{"id":214,"number":26,"name":215,"role":216,"partCount":21},"clamp-cylinder","Clamping cylinder","The hydraulic cylinder behind the rear platen. It drives the crosshead that straightens the toggle links, which opens and closes the mold and builds the clamping force.",{"id":218,"number":21,"name":219,"role":220,"partCount":50},"toggle","Toggle mechanism","Links, pins and bushings between the rear and moving platens. They multiply the force of the clamping cylinder and lock the mold shut while plastic is injected.",{"id":222,"number":113,"name":223,"role":224,"partCount":113},"ejector","Ejector","A small cylinder behind the moving platen that pushes the ejector rods and plate forward to release the finished part from the mold.",{"id":78,"number":16,"name":226,"role":227,"partCount":40},"Tie bars & bushings","Four steel columns that join the platens, guide the moving platen and carry the clamping force. Tie bar nuts lock them in place; bushings guide the moving platen along them.",{"id":88,"number":70,"name":229,"role":230,"partCount":21},"Platens & mold plates","The fixed and moving platens carry the two halves of the mold; the rear platen anchors the toggle. Locating rings and clamping plates center and hold the mold.",{"id":232,"number":50,"name":233,"role":234,"partCount":50},"barrel-screw","Barrel, screw & nozzle","The screw turns inside the heated barrel to melt and mix the plastic, then moves forward to inject it through the nozzle into the mold. The screw tip and check ring stop melt from flowing back.",{"id":30,"number":79,"name":236,"role":237,"partCount":113},"Heater bands & sensors","Heater bands around the barrel and nozzle melt the plastic. Thermocouples measure each heating zone so the controller can hold the set temperature.",{"id":239,"number":84,"name":240,"role":241,"partCount":79},"injection-unit","Injection unit","Injection cylinders push the screw forward, the hydraulic (plasticizing) motor turns it, and the carriage moves the unit against the mold on its guide rails.",{"id":243,"number":244,"name":245,"role":246,"partCount":247},"hydraulics",9,"Hydraulic unit","The pump, motor, valves, accumulator, filters and oil cooler in the machine base. They supply and control the oil pressure for every movement of the machine.",16,{"id":8,"number":171,"name":249,"role":250,"partCount":244},"Electrical cabinet","The controller, I\u002FO and drive boards, servo drives, contactors and safety switches that run and protect the machine.",{"id":252,"number":10,"name":253,"role":254,"partCount":21},"feet","Machine feet","Leveling bolts and anti-vibration pads under the machine base that keep the machine level and stop vibration spreading to the floor.",{"parts":256,"subcategories":257},70,23,{"id":259,"title":260,"body":261,"description":512,"diagram":513,"extension":514,"faq":515,"item":528,"lastModified":529,"meta":530,"navigation":531,"order":50,"parts":532,"path":534,"seo":535,"seoTitle":536,"short":537,"stem":538,"__hash__":539},"guides\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle.md","Shut-off nozzle for injection molding: types and uses",{"type":262,"value":263,"toc":503},"minimark",[264,268,277,282,305,308,312,379,382,386,398,406,409,413,445,449,469,473,490],[265,266,267],"p",{},"A shut-off nozzle is an injection molding nozzle with a built-in valve that closes the melt channel between shots. It stops material drooling or stringing from the nozzle when the injection unit moves away from the mold, and lets the screw recover with back pressure while the nozzle is closed. Shut-off nozzles are used mainly with low-viscosity materials such as nylon and in processes that need the front of the barrel sealed, and they add moving parts that an open nozzle does not have.",[265,269,270,271,276],{},"A shut-off nozzle takes the place of the standard nozzle, item 1 in the drawing. For nozzle sizing and sealing against the sprue bushing, which apply to every nozzle, see the ",[272,273,275],"a",{"href":274},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle\u002F","nozzle guide",".",[278,279,281],"h2",{"id":280},"how-a-shut-off-nozzle-works","How a shut-off nozzle works",[283,284,285,293,299],"ol",{},[286,287,288,292],"li",{},[289,290,291],"strong",{},"Injection and hold."," The valve is open, and the melt flows through the nozzle into the mold as it would through an open nozzle.",[286,294,295,298],{},[289,296,297],{},"After hold."," The valve closes. The screw can now recover with back pressure, and the injection unit can retract from the sprue bushing without melt running out of the tip.",[286,300,301,304],{},[289,302,303],{},"Next shot."," The valve opens again before or as injection starts.",[265,306,307],{},"On machines with an actuated valve, the controller has a shut-off nozzle function that sets when it opens and closes. The valve must be open before the screw injects; the machine manual describes the interlocks.",[278,309,311],{"id":310},"types-of-shut-off-nozzle","Types of shut-off nozzle",[313,314,315,331],"table",{},[316,317,318],"thead",{},[319,320,321,325,328],"tr",{},[322,323,324],"th",{},"Type",[322,326,327],{},"How it is opened and closed",[322,329,330],{},"Notes",[332,333,334,346,357,368],"tbody",{},[319,335,336,340,343],{},[337,338,339],"td",{},"Spring-loaded needle",[337,341,342],{},"A spring holds a needle in the orifice; injection pressure pushes it open",[337,344,345],{},"No outside control; the spring can weaken with heat",[319,347,348,351,354],{},[337,349,350],{},"Actuated needle",[337,352,353],{},"A hydraulic or pneumatic cylinder moves the needle through a lever, on a signal from the controller",[337,355,356],{},"Positive opening and closing, with timing set on the machine",[319,358,359,362,365],{},[337,360,361],{},"Sliding (contact) type",[337,363,364],{},"Pressing the nozzle against the sprue bushing slides it open; retracting closes it",[337,366,367],{},"Opens only when the nozzle is in contact with the mold",[319,369,370,373,376],{},[337,371,372],{},"Bolt or cross-slide type",[337,374,375],{},"A pin or bolt across the melt channel, moved by a cylinder, opens or blocks it",[337,377,378],{},"Straight flow path when open",[265,380,381],{},"The actuated types need a cylinder, a valve and wiring or hoses, and the nozzle body is longer than a standard nozzle. Check the space between the barrel head and the mold before choosing one.",[278,383,385],{"id":384},"when-to-use-a-shut-off-nozzle","When to use a shut-off nozzle",[387,388,389,392,395],"ul",{},[286,390,391],{},"Low-viscosity materials that drool from an open nozzle, such as nylon.",[286,393,394],{},"Processes where the injection unit retracts from the mold every cycle and the screw should recover while it is away.",[286,396,397],{},"Foamed materials, where the melt must stay under pressure until it is injected.",[265,399,400,401,405],{},"Before fitting one for drool, check the simpler fixes: lower the nozzle temperature, set decompression (suck-back) after recovery, reduce back pressure, or use a reverse-taper tip. Our article on ",[272,402,404],{"href":403},"\u002Fblog\u002Finjection-nozzle-problems-troubleshooting\u002F","nozzle drooling, stringing and blockages"," goes through them.",[265,407,408],{},"Avoid shut-off nozzles for heat-sensitive materials such as rigid PVC, where any spot in which melt can hang up leads to degradation, unless the nozzle maker and the material supplier approve it. Abrasive filled materials wear the needle and seat faster.",[278,410,412],{"id":411},"common-faults-and-their-causes","Common faults and their causes",[387,414,415,421,427,433,439],{},[286,416,417,420],{},[289,418,419],{},"Drool or leaking when closed:"," worn needle or seat, degraded plastic on the seat, a weak spring, or an actuator that does not close fully.",[286,422,423,426],{},[289,424,425],{},"Valve not opening fully:"," injection pressure rises, fill slows and short shots appear. Causes are a sticking needle, a fault in the actuating cylinder, its valve or its signal, or a worn linkage.",[286,428,429,432],{},[289,430,431],{},"Black specks or burnt streaks:"," melt hanging up in dead spots inside the nozzle, often because the nozzle runs too hot or the material sits too long.",[286,434,435,438],{},[289,436,437],{},"Seized needle:"," carbonized plastic around it after overheating or a long stop.",[286,440,441,444],{},[289,442,443],{},"Oil or air leaks"," at the actuating cylinder, or play in the lever and pins.",[278,446,448],{"id":447},"maintenance-and-cleaning","Maintenance and cleaning",[283,450,451,454,457,460,463,466],{},[286,452,453],{},"Purge the barrel and keep the nozzle at processing temperature.",[286,455,456],{},"Before removing the nozzle, make sure the valve is open or the pressure in front of the screw has been relieved. A closed shut-off nozzle can trap molten plastic and gas under pressure.",[286,458,459],{},"Retract the injection unit and remove the nozzle hot, as described on the nozzle page, wearing heat-resistant gloves and a face shield.",[286,461,462],{},"Take the nozzle apart following the maker's instructions and clean the parts while warm, with brass tools.",[286,464,465],{},"Inspect the needle tip and its seat for wear and scoring, the spring for loss of length, and the actuator seals and linkage for leaks and play.",[286,467,468],{},"Replace worn parts, reassemble with high-temperature anti-seize on the threads, and check the open and close timing on the machine before production.",[278,470,472],{"id":471},"what-to-send-for-a-quote","What to send for a quote",[283,474,475,478,481,484,487],{},[286,476,477],{},"The machine brand and model, and the nozzle thread.",[286,479,480],{},"The type and the actuation (spring, hydraulic, pneumatic or contact).",[286,482,483],{},"The overall length, and the tip radius and orifice to suit the mold's sprue bushing.",[286,485,486],{},"The materials you run and the problem you want to solve.",[286,488,489],{},"Photos of the old nozzle and its actuator, and the OEM part number if you have it.",[265,491,492,493,497,498,502],{},"The ",[272,494,496],{"href":495},"\u002Fparts\u002Fmc-bc-07\u002F","injection nozzles"," we supply include open, shut-off and filter types. ",[272,499,501],{"href":500},"\u002Frequest-quote\u002F","Request a quote"," with the details above.",{"title":504,"searchDepth":21,"depth":21,"links":505},"",[506,507,508,509,510,511],{"id":280,"depth":21,"text":281},{"id":310,"depth":21,"text":311},{"id":384,"depth":21,"text":385},{"id":411,"depth":21,"text":412},{"id":447,"depth":21,"text":448},{"id":471,"depth":21,"text":472},"What a shut-off nozzle does in injection molding, needle, sliding and bolt types, spring or cylinder actuation, when to use one, common faults and maintenance.",null,"md",[516,519,522,525],{"question":517,"answer":518},"What is a shut-off nozzle used for in injection molding?","A shut-off nozzle closes the melt channel between shots, so material does not drool or string from the nozzle when the injection unit moves away from the mold. It also lets the screw recover with back pressure while the nozzle is off the sprue bushing.",{"question":520,"answer":521},"What is the difference between a spring-loaded and a hydraulic shut-off nozzle?","In a spring-loaded nozzle a spring holds the needle closed and the injection pressure pushes it open, with no outside control. In a hydraulic or pneumatic nozzle a cylinder opens and closes the valve on a signal from the machine, so the timing is set in the controller.",{"question":523,"answer":524},"Can a shut-off nozzle be used with PVC?","It is generally avoided for rigid PVC and other heat-sensitive materials, because any place where melt can hang up inside the valve lets it degrade. Ask the material supplier before using one with a heat-sensitive grade.",{"question":526,"answer":527},"Why does a shut-off nozzle still drool?","Usually because the valve is not closing fully: a worn needle or seat, degraded plastic on the seat, a weak spring, or an actuator that does not complete its stroke. Too high a nozzle temperature or back pressure makes it worse.","nozzle","2026-11-01",{},true,[533],"MC-BC-07","\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle",{"title":260,"description":512},"Shut-Off Nozzle in Injection Molding: Types and Uses","Shut-off nozzle","injection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle","JFHZxk_ajIptu2lthTDfBnrAOudo9SaGVOn2k8BZeSE",[541,545,549,553,557,561,565,569,573,577,581,585,589],{"path":542,"title":543,"short":544},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew","Injection molding screw: parts, zones and types","Screw",{"path":546,"title":547,"short":548},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel","Injection molding machine barrel: construction, zones and wear","Barrel",{"path":550,"title":551,"short":552},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fcheck-ring","Check ring (non-return valve) of an injection molding screw","Check ring",{"path":554,"title":555,"short":556},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew-tip","Screw tip of an injection molding machine: types and removal","Screw tip",{"path":558,"title":559,"short":560},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle","Injection molding machine nozzle: tip, size and design","Nozzle",{"path":562,"title":563,"short":564},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle-filter","Injection molding nozzle filter: types, use and cleaning","Nozzle filter",{"path":566,"title":567,"short":568},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel-head","Barrel head (front flange) of an injection molding machine","Barrel head",{"path":570,"title":571,"short":572},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fhopper-and-feed-throat","Hopper and feed throat of an injection molding machine","Hopper and feed throat",{"path":574,"title":575,"short":576},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbimetallic-barrel","Bimetallic barrel and screw for injection molding machines","Bimetallic barrel",{"path":578,"title":579,"short":580},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fl-d-ratio","Screw L\u002FD ratio and compression ratio in injection molding","L\u002FD ratio",{"path":582,"title":583,"short":584},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure","Back pressure in injection molding: what it does and how to set it","Back pressure",{"path":586,"title":587,"short":588},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshot-size","Shot size calculation for injection molding machines","Shot size calculation",{"path":590,"title":591,"short":592},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fremoving-the-screw","How to remove the screw from an injection molding machine","Removing the screw",{"diagram":239},{"diagram":595},{"title":596,"description":597,"base":598,"labels":609,"items":620},"Parts of the injection unit","Section through an injection unit: nozzle, barrel front flange, barrel, screw with its feed, compression and metering zones, screw tip and check ring, heater bands, hopper throat and injection cylinder, numbered.",{"solid":599,"line":601},[600],"M470 118h14v104h-14z",[602,603,604,605,606,607,608],"M484 124L520 124","M484 216L520 216","M142 212L466 212","M142 207L142 217","M240 207L240 217","M340 207L340 217","M466 207L466 217",[610,614,617],{"x":611,"y":612,"text":613},191,228,"METERING",{"x":615,"y":612,"text":616},290,"COMPRESSION",{"x":618,"y":612,"text":619},403,"FEED",[621,634,651,666,697,710,734,747],{"id":528,"name":560,"role":622,"parts":623,"marker":624,"shapes":628},"Screws into the front of the barrel and seals against the mold’s sprue bushing. The melt passes through it on every shot.",[533],[625,626,625,627],52,24,156,{"solid":629,"hidden":632},[630,631],"M32 166L50 158L50 182L32 174Z","M52 156h36a2 2 0 0 1 2 2v24a2 2 0 0 1 -2 2h-36a2 2 0 0 1 -2 -2v-24a2 2 0 0 1 2 -2z",[633],"M34 170L88 170",{"id":635,"name":636,"role":637,"parts":638,"marker":640,"shapes":643},"front-flange","Barrel front flange","Also called the front head or end cap. It closes the front of the barrel and holds the nozzle.",[639],"MC-BC-08",[641,626,641,642],98,144,{"solid":644,"line":646,"hidden":649},[645],"M90 144h16a2 2 0 0 1 2 2v48a2 2 0 0 1 -2 2h-16a2 2 0 0 1 -2 -2v-48a2 2 0 0 1 2 -2z",[647,648],"M95.5 151a2.5 2.5 0 1 0 5 0a2.5 2.5 0 1 0 -5 0z","M95.5 189a2.5 2.5 0 1 0 5 0a2.5 2.5 0 1 0 -5 0z",[650],"M90 170L108 170",{"id":652,"name":548,"role":653,"parts":654,"marker":657,"shapes":660},"barrel","Thick steel tube the screw turns in. Bimetallic barrels have a hard alloy lining that resists wear from glass-filled and abrasive plastics.",[655,656],"MC-BC-01","MC-SB-01",[658,626,658,659],188,146,{"solid":661,"line":663},[662],"M108 146h362v48h-362z",[664,665],"M108 156L470 156","M108 184L470 184",{"id":667,"name":544,"role":668,"parts":669,"marker":671,"shapes":676},"screw","Melts and meters the plastic. Its flights are deep in the feed zone, get shallower through the compression zone and stay shallow in the metering zone.",[670],"MC-BC-02",[672,673,674,675],230,336,232,178,{"solid":677,"line":680},[678,679],"M142 162L240 162L340 166L486 166L486 174L340 174L240 178L142 178Z","M488 162h30a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-30a2 2 0 0 1 -2 -2v-12a2 2 0 0 1 2 -2z",[681,682,683,684,685,686,687,688,689,690,691,692,693,694,695,696],"M148 157L156 183","M168 157L176 183","M188 157L196 183","M208 157L216 183","M228 157L236 183","M248 157L256 183","M268 157L276 183","M288 157L296 183","M308 157L316 183","M328 157L336 183","M348 157L356 183","M368 157L376 183","M388 157L396 183","M408 157L416 183","M428 157L436 183","M448 157L456 183",{"id":698,"name":699,"role":700,"marker":701,"shapes":705},"screw-tip","Screw tip and check ring","A non-return valve on the front of the screw. The ring lets melt pass while the screw turns and seals when it injects, so the shot does not flow back.",[702,673,703,704],122,128,183,{"solid":706},[707,708,709],"M110 170L122 163L132 163L132 177L122 177Z","M125 157h8a1 1 0 0 1 1 1v24a1 1 0 0 1 -1 1h-8a1 1 0 0 1 -1 -1v-24a1 1 0 0 1 1 -1z","M134 159h8v22h-8z",{"id":711,"name":712,"role":713,"subcategory":28,"marker":714,"shapes":718},"heater-bands","Heater bands","Bands around the barrel and nozzle that heat the plastic to its processing temperature, each zone controlled by its own thermocouple.",[715,626,716,717],330,313,138,{"solid":719},[720,721,722,723,724,725,726,727,728,729,730,731,732,733],"M152 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M152 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M202 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M202 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M252 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M252 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M302 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M302 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M352 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M352 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M402 138h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M402 194h22a2 2 0 0 1 2 2v4a2 2 0 0 1 -2 2h-22a2 2 0 0 1 -2 -2v-4a2 2 0 0 1 2 -2z","M58 150h20a2 2 0 0 1 2 2v2a2 2 0 0 1 -2 2h-20a2 2 0 0 1 -2 -2v-2a2 2 0 0 1 2 -2z","M58 184h20a2 2 0 0 1 2 2v2a2 2 0 0 1 -2 2h-20a2 2 0 0 1 -2 -2v-2a2 2 0 0 1 2 -2z",{"id":735,"name":572,"role":736,"marker":737,"shapes":740},"feed-throat","Pellets drop from the hopper through the feed throat into the screw. The throat is usually water-cooled so the pellets do not melt and stick before the screw.",[738,626,738,739],446,62,{"solid":741,"hidden":744},[742,743],"M410 62L482 62L462 110L430 110Z","M434 110h24v36h-24z",[745,746],"M434 146L434 156","M458 146L458 156",{"id":748,"name":749,"role":750,"parts":751,"subcategory":72,"marker":753,"shapes":757},"injection-cylinder","Injection cylinder","Hydraulic cylinder that drives the screw forward to inject and holds pressure while the part sets. Its seals are wear parts.",[752],"MC-BC-06",[754,626,755,756],556,560,132,{"solid":758,"hidden":764},[759,760,761,762,763],"M520 128h8v84h-8z","M528 132h62v76h-62z","M590 128h8v84h-8z","M540 124h10v8h-10z","M570 124h10v8h-10z",[765,766],"M548 136h10v68h-10z","M528 170L548 170",[768],{"partNumber":533,"name":769,"subcategory":67,"subcategoryName":68,"shortDescription":770,"inStock":531,"zone":232,"compatibleMachines":771},"Injection Nozzle","Precision-machined injection nozzle for plastic injection molding machines.",[772,773,774],"Haitian MA II Series","Haitian MA IIS Series","Haitian MA III Series",1793548981030]