[{"data":1,"prerenderedAt":769},["ShallowReactive",2],{"catalog:meta":3,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel:*":258,"guides:topics:barrel-screw:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel:path,title,short":526,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw:diagram":579,"diagram:id:injection-unit":580,"catalog:parts::MC-BC-01,MC-SB-01":752},{"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":497,"diagram":498,"extension":499,"faq":500,"item":513,"lastModified":514,"meta":515,"navigation":516,"order":21,"parts":517,"path":520,"seo":521,"seoTitle":522,"short":523,"stem":524,"__hash__":525},"guides\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel.md","Injection molding machine barrel: construction, zones and wear",{"type":262,"value":263,"toc":487},"minimark",[264,268,277,282,327,332,348,352,359,367,370,374,377,415,419,442,455,459,479],[265,266,267],"p",{},"The injection molding machine barrel is the thick-walled steel tube that the screw turns in. It holds the plastic while it melts, carries the heater bands that bring it to processing temperature, and withstands the full injection pressure on every shot. At the rear it has the feed opening under the hopper; at the front it is closed by the barrel head (front flange), which holds the nozzle. Its bore and the screw flights wear against each other, and the clearance between them decides how well the screw can hold the shot.",[265,269,270,271,276],{},"The barrel is item 3 in the drawing. For how it works with the screw and the other parts of the plasticizing unit, see the ",[272,273,275],"a",{"href":274},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002F","barrel and screw guide",".",[278,279,281],"h2",{"id":280},"how-an-injection-molding-machine-barrel-is-built","How an injection molding machine barrel is built",[283,284,285,293,299,305,311,321],"ul",{},[286,287,288,292],"li",{},[289,290,291],"strong",{},"Tube."," Alloy steel, with a bore ground or honed to a close fit around the screw flights. The small clearance is what lets the screw build pressure and push the melt forward instead of letting it slip back.",[286,294,295,298],{},[289,296,297],{},"Feed opening."," A port in the top of the barrel at the rear, under the feed throat. The pellets drop through it onto the feed zone of the screw.",[286,300,301,304],{},[289,302,303],{},"Mounting."," The rear end is fixed to the injection unit housing. The way it is held (a flange, a nut or a clamp) varies by machine.",[286,306,307,310],{},[289,308,309],{},"Thermocouple holes."," Drilled into the barrel wall, one for each heating zone, so the thermocouple measures the steel close to the melt.",[286,312,313,316,317,276],{},[289,314,315],{},"Front face."," A machined face, on most machines with tapped holes for the bolts of the ",[272,318,320],{"href":319},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel-head\u002F","barrel head",[286,322,323,326],{},[289,324,325],{},"Heater bands and cover."," Bands clamped around the outside in zones, usually under a sheet-metal cover that protects operators from the hot surface.",[328,329,331],"h3",{"id":330},"the-bore-surface","The bore surface",[265,333,334,335,338,339,342,343,347],{},"Standard barrels have a ",[289,336,337],{},"nitrided"," bore: the steel is hardened to a shallow depth by nitriding. ",[289,340,341],{},"Bimetallic"," barrels have a layer of wear-resistant alloy cast and bonded inside the bore, which lasts much longer with glass-filled, mineral-filled and flame-retardant plastics. The ",[272,344,346],{"href":345},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbimetallic-barrel\u002F","bimetallic barrel guide"," explains how the two compare.",[278,349,351],{"id":350},"barrel-zones","Barrel zones",[265,353,354,355,358],{},"The barrel is heated in several ",[289,356,357],{},"zones",", usually called rear (or feed), middle and front, with the nozzle as a separate zone. Each zone has one or more heater bands and its own thermocouple, and the controller holds each zone at its set point. Many materials run with a temperature profile that rises from the feed end to the front, but the material supplier's data sheet gives the recommended settings.",[265,360,361,362,366],{},"In production, much of the heat that melts the plastic is shear heat from the turning screw rather than heat from the bands, so a zone's actual temperature can run above its set point at high screw speeds or back pressures. The ",[272,363,365],{"href":364},"\u002Finjection-molding-machine-parts\u002Fheaters\u002Fbarrel-temperature-zones\u002F","barrel temperature zones guide"," covers zone settings and the heater bands and thermocouples that control them.",[265,368,369],{},"The barrel's heating zones are not the same as the screw zones (feed, compression, metering): those are set by the shape of the screw.",[278,371,373],{"id":372},"barrel-wear-and-damage","Barrel wear and damage",[265,375,376],{},"A worn barrel shows the same symptoms as a worn screw: an unstable cushion, longer recovery, short shots and black specks. The damage behind them is usually one of these:",[283,378,379,385,391,397,403,409],{},[286,380,381,384],{},[289,382,383],{},"Even bore wear"," from abrasive fillers, which opens the clearance all around.",[286,386,387,390],{},[289,388,389],{},"One-sided wear",", which points to misalignment between the barrel and the screw drive, or to a bent screw.",[286,392,393,396],{},[289,394,395],{},"Local damage"," at one spot, from a hot spot, a piece of foreign metal or corrosion.",[286,398,399,402],{},[289,400,401],{},"Corrosion pitting"," from plastics or additives that release corrosive gases when they overheat.",[286,404,405,408],{},[289,406,407],{},"Damaged front face or bolt threads",", which makes the barrel head leak.",[286,410,411,414],{},[289,412,413],{},"Cracks",", which are rare and can follow injecting at high pressure on plastic that was not fully melted.",[278,416,418],{"id":417},"inspecting-and-measuring-the-barrel","Inspecting and measuring the barrel",[420,421,422,430,433,436,439],"ol",{},[286,423,424,425,429],{},"Pull the screw while the barrel is at temperature (see ",[272,426,428],{"href":427},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fremoving-the-screw\u002F","how to remove the screw",").",[286,431,432],{},"Clean the bore while it is warm, with brass brushes and cotton rags on a rod, until the rags come out clean.",[286,434,435],{},"Inspect the bore with a light for scoring, pitting and uneven polish, and check the front face and bolt threads.",[286,437,438],{},"Once the barrel has cooled, measure the bore with a bore gauge at several positions along its length, and in two directions at each position to find ovality.",[286,440,441],{},"Compare the readings with the nominal bore from the machine documentation, and with the screw flight diameters.",[265,443,444,445,449,450,454],{},"Our guide to ",[272,446,448],{"href":447},"\u002Fblog\u002Fmeasuring-barrel-screw-wear-injection-molding\u002F","measuring barrel and screw wear"," explains how to read the results, and ",[272,451,453],{"href":452},"\u002Fblog\u002Fwhen-to-replace-injection-molding-machine-barrel\u002F","when to replace the barrel"," covers the decision. If the barrel is worn, a new screw alone will not restore the clearance, so the barrel and screw are normally replaced together.",[278,456,458],{"id":457},"what-to-send-for-a-replacement-barrel","What to send for a replacement barrel",[420,460,461,464,467,470,473,476],{},[286,462,463],{},"The machine brand and model, the injection unit size and the screw diameter.",[286,465,466],{},"The plastics you run and any fillers, and whether the old barrel is nitrided or bimetallic.",[286,468,469],{},"The overall length, outside diameter and bore, and the position and size of the feed opening.",[286,471,472],{},"The mounting at the rear end and the bolt pattern on the front face.",[286,474,475],{},"The positions and thread size of the thermocouple holes.",[286,477,478],{},"Photos of the whole barrel and both ends, and the OEM part number or a drawing if you have one.",[265,480,481,482,486],{},"The barrel assemblies we supply are shown below. ",[272,483,485],{"href":484},"\u002Frequest-quote\u002F","Request a quote"," with the details above.",{"title":488,"searchDepth":21,"depth":21,"links":489},"",[490,493,494,495,496],{"id":280,"depth":21,"text":281,"children":491},[492],{"id":330,"depth":113,"text":331},{"id":350,"depth":21,"text":351},{"id":372,"depth":21,"text":373},{"id":417,"depth":21,"text":418},{"id":457,"depth":21,"text":458},"What the barrel of an injection molding machine does, how it is built and heated, its temperature zones, nitrided and bimetallic bores, wear and replacement.",null,"md",[501,504,507,510],{"question":502,"answer":503},"What is an injection molding machine barrel made of?","The barrel is a thick-walled tube of alloy steel. Its bore is either nitrided, which hardens a thin surface layer of the steel, or lined with a cast layer of wear-resistant alloy in a bimetallic barrel.",{"question":505,"answer":506},"How many heating zones does an injection molding barrel have?","It depends on the barrel length: shorter barrels have fewer zones and longer barrels more, commonly a rear, a middle and a front zone. Each zone has its own heater bands and thermocouple, and the nozzle is usually controlled as a separate zone.",{"question":508,"answer":509},"Are barrel zones the same as screw zones?","No. Screw zones (feed, compression, metering) are set by the shape of the screw. Barrel zones are heating zones, each with its own heater bands and thermocouple, and they do not line up exactly with the screw zones.",{"question":511,"answer":512},"Can a worn barrel be repaired?","Some barrels can be honed oversize and matched with an oversize screw, or relined by a specialist, depending on the barrel design and how far it is worn. More often a worn barrel is replaced, usually together with the screw.","barrel","2026-11-01",{},true,[518,519],"MC-BC-01","MC-SB-01","\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel",{"title":260,"description":497},"Injection Molding Machine Barrel: Zones, Wear, Replacement","Barrel","injection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel","fKWwi9mQ2U1yYTc6Ax6qhHrFhwmh9333q_sOJdOkbHE",[527,531,535,539,543,547,551,555,559,563,567,571,575],{"path":528,"title":529,"short":530},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew","Injection molding screw: parts, zones and types","Screw",{"path":532,"title":533,"short":534},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fcheck-ring","Check ring (non-return valve) of an injection molding screw","Check ring",{"path":536,"title":537,"short":538},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew-tip","Screw tip of an injection molding machine: types and removal","Screw tip",{"path":540,"title":541,"short":542},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle","Injection molding machine nozzle: tip, size and design","Nozzle",{"path":544,"title":545,"short":546},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle","Shut-off nozzle for injection molding: types and uses","Shut-off nozzle",{"path":548,"title":549,"short":550},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle-filter","Injection molding nozzle filter: types, use and cleaning","Nozzle filter",{"path":552,"title":553,"short":554},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel-head","Barrel head (front flange) of an injection molding machine","Barrel head",{"path":556,"title":557,"short":558},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fhopper-and-feed-throat","Hopper and feed throat of an injection molding machine","Hopper and feed throat",{"path":560,"title":561,"short":562},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbimetallic-barrel","Bimetallic barrel and screw for injection molding machines","Bimetallic barrel",{"path":564,"title":565,"short":566},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fl-d-ratio","Screw L\u002FD ratio and compression ratio in injection molding","L\u002FD ratio",{"path":568,"title":569,"short":570},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure","Back pressure in injection molding: what it does and how to set it","Back pressure",{"path":572,"title":573,"short":574},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshot-size","Shot size calculation for injection molding machines","Shot size calculation",{"path":576,"title":577,"short":578},"\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":581},{"title":582,"description":583,"base":584,"labels":595,"items":606},"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":585,"line":587},[586],"M470 118h14v104h-14z",[588,589,590,591,592,593,594],"M484 124L520 124","M484 216L520 216","M142 212L466 212","M142 207L142 217","M240 207L240 217","M340 207L340 217","M466 207L466 217",[596,600,603],{"x":597,"y":598,"text":599},191,228,"METERING",{"x":601,"y":598,"text":602},290,"COMPRESSION",{"x":604,"y":598,"text":605},403,"FEED",[607,622,639,651,682,695,719,732],{"id":608,"name":542,"role":609,"parts":610,"marker":612,"shapes":616},"nozzle","Screws into the front of the barrel and seals against the mold’s sprue bushing. The melt passes through it on every shot.",[611],"MC-BC-07",[613,614,613,615],52,24,156,{"solid":617,"hidden":620},[618,619],"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",[621],"M34 170L88 170",{"id":623,"name":624,"role":625,"parts":626,"marker":628,"shapes":631},"front-flange","Barrel front flange","Also called the front head or end cap. It closes the front of the barrel and holds the nozzle.",[627],"MC-BC-08",[629,614,629,630],98,144,{"solid":632,"line":634,"hidden":637},[633],"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",[635,636],"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",[638],"M90 170L108 170",{"id":513,"name":523,"role":640,"parts":641,"marker":642,"shapes":645},"Thick steel tube the screw turns in. Bimetallic barrels have a hard alloy lining that resists wear from glass-filled and abrasive plastics.",[518,519],[643,614,643,644],188,146,{"solid":646,"line":648},[647],"M108 146h362v48h-362z",[649,650],"M108 156L470 156","M108 184L470 184",{"id":652,"name":530,"role":653,"parts":654,"marker":656,"shapes":661},"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.",[655],"MC-BC-02",[657,658,659,660],230,336,232,178,{"solid":662,"line":665},[663,664],"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",[666,667,668,669,670,671,672,673,674,675,676,677,678,679,680,681],"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":683,"name":684,"role":685,"marker":686,"shapes":690},"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.",[687,658,688,689],122,128,183,{"solid":691},[692,693,694],"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":696,"name":697,"role":698,"subcategory":28,"marker":699,"shapes":703},"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.",[700,614,701,702],330,313,138,{"solid":704},[705,706,707,708,709,710,711,712,713,714,715,716,717,718],"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":720,"name":558,"role":721,"marker":722,"shapes":725},"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.",[723,614,723,724],446,62,{"solid":726,"hidden":729},[727,728],"M410 62L482 62L462 110L430 110Z","M434 110h24v36h-24z",[730,731],"M434 146L434 156","M458 146L458 156",{"id":733,"name":734,"role":735,"parts":736,"subcategory":72,"marker":738,"shapes":742},"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.",[737],"MC-BC-06",[739,614,740,741],556,560,132,{"solid":743,"hidden":749},[744,745,746,747,748],"M520 128h8v84h-8z","M528 132h62v76h-62z","M590 128h8v84h-8z","M540 124h10v8h-10z","M570 124h10v8h-10z",[750,751],"M548 136h10v68h-10z","M528 170L548 170",[753,762],{"partNumber":518,"name":754,"subcategory":67,"subcategoryName":68,"shortDescription":755,"image":756,"inStock":516,"zone":232,"compatibleMachines":757},"Bimetallic Barrel & Screw Assembly","High-quality bimetallic barrel and screw assembly for plastic injection molding machines.","\u002Fpart-images\u002FMC\u002FMC-BC-01\u002FMC-BC-02\u002Ffront.jpg",[758,759,760,761],"Haitian MA Series","Haitian MA II Series","Haitian Jupiter Series","Yizumi A5 Series",{"partNumber":519,"name":763,"subcategory":72,"subcategoryName":764,"shortDescription":765,"image":766,"inStock":516,"zone":232,"compatibleMachines":767},"Screw Barrel Assembly","Seals & Bearings","Complete screw and barrel assembly for injection molding machine plasticizing unit.","\u002Fpart-images\u002FMC\u002FMC-BC-01\u002FMC-SB-01\u002F8a8d3cba-2faf-4123-8b59-514390486726.png",[758,768,759],"Haitian MA1600",1793548980866]