[{"data":1,"prerenderedAt":944},["ShallowReactive",2],{"catalog:meta":3,"guides:page:\u002Finjection-molding-machine-parts\u002Finjection-unit:*":258,"guides:topics:injection-unit::path,title,short,description,item":665,"diagram:id:injection-unit":691,"catalog:parts:injection-unit:MC-BC-01,MC-BC-02,MC-BC-06,MC-BC-07,MC-BC-08,MC-SB-01":863},{"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":638,"diagram":239,"extension":639,"faq":640,"item":656,"lastModified":657,"meta":658,"navigation":659,"order":656,"parts":656,"path":660,"seo":661,"seoTitle":662,"short":656,"stem":663,"__hash__":664},"guides\u002Finjection-molding-machine-parts\u002Finjection-unit.md","Injection unit of an injection molding machine",{"type":262,"value":263,"toc":619},"minimark",[264,285,290,338,347,351,372,379,387,390,394,399,415,419,426,430,437,441,448,452,459,463,469,473,480,484,491,495,502,506,555,558,562,576,583,587],[265,266,267,268,272,273,276,277,280,281,284],"p",{},"The injection unit of an injection molding machine melts the plastic and injects it into the mold. It is made of the ",[269,270,271],"strong",{},"plasticizing unit"," (nozzle, barrel head, barrel, screw, screw tip and check ring, and the heater bands around them), the ",[269,274,275],{},"injection cylinder"," and piston rod that drive the screw forward, the ",[269,278,279],{},"plasticizing motor"," that turns the screw, and the ",[269,282,283],{},"carriage"," that moves the whole unit to and from the mold on guide columns or linear guides. The numbered drawing shows the plasticizing unit and injection cylinder in section; this guide explains how the injection unit works as a whole, how its mechanical and hydraulic parts wear, and what to send for a replacement.",[286,287,289],"h2",{"id":288},"what-the-injection-unit-does-in-the-cycle","What the injection unit does in the cycle",[291,292,293,304,310,316,326,332],"ol",{},[294,295,296,299,300,303],"li",{},[269,297,298],{},"Carriage forward."," Carriage cylinders move the injection unit forward until the nozzle touches the sprue bushing of the mold, then hold it there with the ",[269,301,302],{},"nozzle contact force"," so the melt cannot leak at the joint.",[294,305,306,309],{},[269,307,308],{},"Injection."," Oil flows into the injection cylinder, which drives the screw forward like a plunger. The check ring closes and the melt is pushed into the mold at the set speeds.",[294,311,312,315],{},[269,313,314],{},"Hold pressure."," At a set screw position, pressure or time, the machine switches from speed control to pressure control and holds pressure while the part cools and shrinks.",[294,317,318,321,322,325],{},[269,319,320],{},"Recovery (plasticizing)."," The plasticizing motor turns the screw. Melt collects in front of it and pushes the screw back, against the ",[269,323,324],{},"back pressure"," held in the injection cylinder, until the shot size is reached.",[294,327,328,331],{},[269,329,330],{},"Decompression."," The screw is pulled back a short distance to relieve the melt pressure, so the nozzle does not drool.",[294,333,334,337],{},[269,335,336],{},"Carriage back"," (when the process needs it), to break the sprue or to purge.",[265,339,340,341,346],{},"How the barrel and screw melt the plastic is explained in the ",[342,343,345],"a",{"href":344},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002F","barrel and screw guide","; this guide covers the parts that move them.",[286,348,350],{"id":349},"how-injection-speed-and-pressure-are-controlled","How injection speed and pressure are controlled",[265,352,353,354,357,358,361,362,366,367,371],{},"On a hydraulic machine, the ",[269,355,356],{},"oil flow"," into the injection cylinder sets the injection speed, and the ",[269,359,360],{},"oil pressure"," sets the injection and hold pressure. Proportional valves, or a servo-driven pump, adjust both through the cycle; see ",[342,363,365],{"href":364},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fproportional-valve\u002F","proportional valves"," and the ",[342,368,370],{"href":369},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002F","hydraulics guide",".",[265,373,374,375,378],{},"The pressure on the melt is higher than the oil pressure. The injection cylinder's piston area is much larger than the cross-section of the screw, so the force from the oil is concentrated on a smaller area: melt pressure equals oil pressure multiplied by the ",[269,376,377],{},"intensification ratio",", the ratio of the two areas. The ratio depends on the cylinder and the screw diameter: on the same injection unit, a smaller screw gives a higher injection pressure and a larger screw a bigger shot.",[265,380,381,382,386],{},"A ",[342,383,385],{"href":384},"\u002Finjection-molding-machine-parts\u002Felectrical\u002Flinear-transducer\u002F","linear position transducer"," measures the screw position for the shot size, the switchover to hold and the cushion.",[265,388,389],{},"Electric machines replace the injection cylinder with a servo motor and a ball screw, and the plasticizing motor with a second servo motor. The sequence is the same.",[286,391,393],{"id":392},"the-parts-of-the-injection-unit","The parts of the injection unit",[395,396,398],"h3",{"id":397},"nozzle-barrel-screw-and-check-ring","Nozzle, barrel, screw and check ring",[265,400,401,402,406,407,366,411,371],{},"The plasticizing unit: the nozzle, the barrel front flange, the barrel, the screw, and the screw tip and check ring, items 1 to 5 in the drawing. They are covered in the barrel and screw guide linked above and its pages on the ",[342,403,405],{"href":404},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew\u002F","screw",", the ",[342,408,410],{"href":409},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fcheck-ring\u002F","check ring",[342,412,414],{"href":413},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle\u002F","nozzle",[395,416,418],{"id":417},"heater-bands","Heater bands",[265,420,421,422,371],{},"The bands around the barrel and nozzle, each zone with its own thermocouple, bring the plastic to processing temperature. See the ",[342,423,425],{"href":424},"\u002Finjection-molding-machine-parts\u002Fheaters\u002F","heaters guide",[395,427,429],{"id":428},"hopper-and-feed-throat","Hopper and feed throat",[265,431,432,433,371],{},"Pellets fall from the hopper through the water-cooled feed throat onto the screw. See ",[342,434,436],{"href":435},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fhopper-and-feed-throat\u002F","hopper and feed throat",[395,438,440],{"id":439},"injection-cylinder","Injection cylinder",[265,442,443,444,447],{},"Item 8 in the drawing: a double-acting hydraulic cylinder that drives the screw forward to inject, holds pressure, and provides back pressure during recovery. Some machines have one cylinder in line with the screw; many have two cylinders side by side. Worn seals cause slow, weak or uneven injection. See the ",[342,445,275],{"href":446},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Finjection-cylinder\u002F"," page.",[395,449,451],{"id":450},"injection-piston-rod","Injection piston rod",[265,453,454,455,447],{},"The hardened, chrome-plated rod that joins the injection piston to the moving plate and carries the injection force. Its surface runs through the rod seals, so scoring or pitting on it causes oil leaks. See the ",[342,456,458],{"href":457},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Finjection-piston-rod\u002F","injection piston rod",[395,460,462],{"id":461},"plasticizing-motor","Plasticizing motor",[265,464,465,466,447],{},"The low-speed, high-torque hydraulic motor that turns the screw during recovery. Its speed sets the screw speed, and its torque must overcome the resistance of the plastic. See the ",[342,467,279],{"href":468},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Fplasticizing-motor\u002F",[395,470,472],{"id":471},"guide-columns-and-bushings","Guide columns and bushings",[265,474,475,476,371],{},"On many twin-cylinder injection units, the moving plate carrying the screw drive slides on guide columns through bushings, which keep it square to the barrel. Worn bushings let the plate rock and load the screw and the seals unevenly. See ",[342,477,479],{"href":478},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Fguide-columns\u002F","guide columns and bushings",[395,481,483],{"id":482},"linear-guide-and-carriage","Linear guide and carriage",[265,485,486,487,447],{},"The injection unit carriage runs on guide rails on the machine base, on many machines linear guide rails with ball carriage blocks. They keep the nozzle in line with the mold as the carriage moves. See the ",[342,488,490],{"href":489},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Flinear-guide\u002F","linear guide",[395,492,494],{"id":493},"carriage-cylinders","Carriage cylinders",[265,496,497,498,371],{},"One or two hydraulic cylinders between the machine base and the injection unit. They move the carriage and set the nozzle contact force. Their seals are the same kind of wear part as those of the injection cylinder; see ",[342,499,501],{"href":500},"\u002Finjection-molding-machine-parts\u002Fclamp-cylinder\u002Fcylinder-seal-replacement\u002F","cylinder seal replacement",[286,503,505],{"id":504},"common-problems-and-their-symptoms","Common problems and their symptoms",[507,508,509,519,525,531,537,543,549],"ul",{},[294,510,511,514,515,371],{},[269,512,513],{},"Slow or weak injection, or set pressure not reached."," Hydraulic supply, valves, or worn injection cylinder seals. See ",[342,516,518],{"href":517},"\u002Fblog\u002Ftroubleshooting-hydraulic-pressure-loss\u002F","hydraulic pressure loss",[294,520,521,524],{},[269,522,523],{},"Cushion varies, or the screw creeps forward during hold."," Most often the check ring; then the injection cylinder.",[294,526,527,530],{},[269,528,529],{},"Screw does not turn, turns slowly or unevenly."," The plasticizing motor, its supply valve, a cold barrel zone, or a worn drive coupling.",[294,532,533,536],{},[269,534,535],{},"Recovery time increases."," A worn screw and barrel, a cold zone, or internal leakage in the plasticizing motor.",[294,538,539,542],{},[269,540,541],{},"Melt leaks between the nozzle and the sprue bushing."," Nozzle and sprue radius or orifice mismatch, too little nozzle contact force, or the nozzle off center because of worn guides.",[294,544,545,548],{},[269,546,547],{},"Carriage moves jerkily or noisily."," Dry or damaged linear guides, or worn guide bushings.",[294,550,551,554],{},[269,552,553],{},"Oil leaks at the cylinders."," Worn rod seals or a damaged piston rod.",[265,556,557],{},"Measure before replacing: injection time, recovery time, peak injection pressure and cushion, compared with records from when the machine ran well, show which part has changed.",[286,559,561],{"id":560},"what-to-send-for-a-replacement-quote","What to send for a replacement quote",[291,563,564,567,570,573],{},[294,565,566],{},"The machine brand and model, and the injection unit size or screw diameter.",[294,568,569],{},"The part name and, if you have it, the OEM part number or the nameplate data (for a motor, its model and shaft type).",[294,571,572],{},"Photos of the old part and its main dimensions: bore and rod diameter and stroke for cylinders, length and thread sizes for rods, rail width and length for linear guides.",[294,574,575],{},"For seal kits, the cylinder bore and rod diameter, or the markings on the old seals.",[265,577,578,582],{},[342,579,581],{"href":580},"\u002Frequest-quote\u002F","Request a quote"," with these details.",[286,584,586],{"id":585},"maintenance-that-keeps-the-injection-unit-accurate","Maintenance that keeps the injection unit accurate",[507,588,589,597,600,603,606,613,616],{},[294,590,591,592,596],{},"Grease the linear guides and lubricate the guide column bushings as the machine manual specifies; on some machines the centralized lubrication system serves them (see ",[342,593,595],{"href":594},"\u002Finjection-molding-machine-parts\u002Ftoggle\u002Ftoggle-lubrication\u002F","toggle lubrication",").",[294,598,599],{},"Wipe the piston rods and check them for scores and rust, especially after a long stop.",[294,601,602],{},"Look for oil leaks at the cylinders, the plasticizing motor and the hoses at every planned stop.",[294,604,605],{},"Check that the lock nuts on the piston rods and the guide column nuts are tight.",[294,607,608,609,371],{},"Keep the hydraulic oil clean and at the right temperature; see ",[342,610,612],{"href":611},"\u002Fblog\u002Fhydraulic-oil-problems-injection-molding\u002F","hydraulic oil problems",[294,614,615],{},"Check that the nozzle is centered on the sprue bushing after mold changes.",[294,617,618],{},"Record injection time, recovery time and cushion: slow changes over weeks are the earliest sign of wear.",{"title":620,"searchDepth":21,"depth":21,"links":621},"",[622,623,624,635,636,637],{"id":288,"depth":21,"text":289},{"id":349,"depth":21,"text":350},{"id":392,"depth":21,"text":393,"children":625},[626,627,628,629,630,631,632,633,634],{"id":397,"depth":113,"text":398},{"id":417,"depth":113,"text":418},{"id":428,"depth":113,"text":429},{"id":439,"depth":113,"text":440},{"id":450,"depth":113,"text":451},{"id":461,"depth":113,"text":462},{"id":471,"depth":113,"text":472},{"id":482,"depth":113,"text":483},{"id":493,"depth":113,"text":494},{"id":504,"depth":21,"text":505},{"id":560,"depth":21,"text":561},{"id":585,"depth":21,"text":586},"How the injection unit of an injection molding machine works: injection cylinder, piston rod, screw motor, guide columns, linear guides and common faults.","md",[641,644,647,650,653],{"question":642,"answer":643},"What are the main parts of the injection unit?","The plasticizing unit (nozzle, barrel head, barrel, screw, screw tip and check ring, and the heater bands around them), the injection cylinder and its piston rod that push the screw forward, the plasticizing motor that turns the screw, and the carriage that moves the whole unit to and from the mold on guide columns or linear guides.",{"question":645,"answer":646},"What does the injection cylinder do?","It drives the screw forward to inject the melt into the mold, holds pressure while the part cools, and controls back pressure while the screw recovers. On hydraulic machines it is a double-acting hydraulic cylinder; some designs use two cylinders side by side.",{"question":648,"answer":649},"What turns the screw on a hydraulic injection molding machine?","A low-speed, high-torque hydraulic motor at the back of the injection unit, called the plasticizing motor or screw drive motor. Electric machines turn the screw with a servo motor instead.",{"question":651,"answer":652},"Why is injection slow or weak?","Common causes are a hydraulic supply problem (pump, valves or oil), worn injection cylinder seals, and a worn check ring that lets melt flow back over the screw. Check the injection pressure reached and the cushion before replacing parts.",{"question":654,"answer":655},"What is the injection unit carriage?","The frame that carries the whole injection unit. Carriage cylinders move it forward on its guides until the nozzle touches the mold's sprue bushing, hold it there with the nozzle contact force, and pull it back for purging or sprue break.",null,"2026-11-01",{},true,"\u002Finjection-molding-machine-parts\u002Finjection-unit",{"title":260,"description":638},"Injection Unit of an Injection Molding Machine: Parts","injection-molding-machine-parts\u002Finjection-unit","Mqyy26cU7iwfnfSfVKpoKRSez63c1GBLK6gFVZcV1D4",[666,670,675,680,685],{"path":667,"title":668,"short":440,"description":669,"item":439},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Finjection-cylinder","Injection cylinder of an injection molding machine","What the injection cylinder of an injection molding machine does, single and twin designs, signs of worn seals or a scored bore, and how to specify a new one.",{"path":671,"title":672,"short":451,"description":673,"item":674},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Finjection-piston-rod","Injection piston rod of an injection molding machine","What the injection piston rod of an injection molding machine does, how its chrome surface and threads wear, how to inspect it, and what to send for a quote.","piston-rod",{"path":676,"title":677,"short":462,"description":678,"item":679},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Fplasticizing-motor","Plasticizing motor: the hydraulic screw drive motor","How the hydraulic plasticizing motor turns the screw of an injection molding machine, the motor types, signs of a worn motor, and what to send for a quote.","screw-motor",{"path":681,"title":682,"short":472,"description":683,"item":684},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Fguide-columns","Guide columns and guide bushings of the injection unit","What the guide columns, guide bushings and nuts of an injection molding machine do, signs of worn bushings, how to check the play and what to send for a quote.","column",{"path":686,"title":687,"short":688,"description":689,"item":690},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Flinear-guide","Linear guide rail and carriage of the injection unit","Linear guide","How the linear guide rail and carriage blocks under the injection unit of an injection molding machine work, signs of wear, greasing, and replacement.","rail",{"diagram":692},{"title":693,"description":694,"base":695,"labels":706,"items":717},"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":696,"line":698},[697],"M470 118h14v104h-14z",[699,700,701,702,703,704,705],"M484 124L520 124","M484 216L520 216","M142 212L466 212","M142 207L142 217","M240 207L240 217","M340 207L340 217","M466 207L466 217",[707,711,714],{"x":708,"y":709,"text":710},191,228,"METERING",{"x":712,"y":709,"text":713},290,"COMPRESSION",{"x":715,"y":709,"text":716},403,"FEED",[718,733,750,766,797,810,832,845],{"id":414,"name":719,"role":720,"parts":721,"marker":723,"shapes":727},"Nozzle","Screws into the front of the barrel and seals against the mold’s sprue bushing. The melt passes through it on every shot.",[722],"MC-BC-07",[724,725,724,726],52,24,156,{"solid":728,"hidden":731},[729,730],"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",[732],"M34 170L88 170",{"id":734,"name":735,"role":736,"parts":737,"marker":739,"shapes":742},"front-flange","Barrel front flange","Also called the front head or end cap. It closes the front of the barrel and holds the nozzle.",[738],"MC-BC-08",[740,725,740,741],98,144,{"solid":743,"line":745,"hidden":748},[744],"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",[746,747],"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",[749],"M90 170L108 170",{"id":751,"name":752,"role":753,"parts":754,"marker":757,"shapes":760},"barrel","Barrel","Thick steel tube the screw turns in. Bimetallic barrels have a hard alloy lining that resists wear from glass-filled and abrasive plastics.",[755,756],"MC-BC-01","MC-SB-01",[758,725,758,759],188,146,{"solid":761,"line":763},[762],"M108 146h362v48h-362z",[764,765],"M108 156L470 156","M108 184L470 184",{"id":405,"name":767,"role":768,"parts":769,"marker":771,"shapes":776},"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.",[770],"MC-BC-02",[772,773,774,775],230,336,232,178,{"solid":777,"line":780},[778,779],"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",[781,782,783,784,785,786,787,788,789,790,791,792,793,794,795,796],"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":798,"name":799,"role":800,"marker":801,"shapes":805},"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.",[802,773,803,804],122,128,183,{"solid":806},[807,808,809],"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":417,"name":418,"role":811,"subcategory":28,"marker":812,"shapes":816},"Bands around the barrel and nozzle that heat the plastic to its processing temperature, each zone controlled by its own thermocouple.",[813,725,814,815],330,313,138,{"solid":817},[818,819,820,821,822,823,824,825,826,827,828,829,830,831],"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":833,"name":429,"role":834,"marker":835,"shapes":838},"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.",[836,725,836,837],446,62,{"solid":839,"hidden":842},[840,841],"M410 62L482 62L462 110L430 110Z","M434 110h24v36h-24z",[843,844],"M434 146L434 156","M458 146L458 156",{"id":439,"name":440,"role":846,"parts":847,"subcategory":72,"marker":849,"shapes":853},"Hydraulic cylinder that drives the screw forward to inject and holds pressure while the part sets. Its seals are wear parts.",[848],"MC-BC-06",[850,725,851,852],556,560,132,{"solid":854,"hidden":860},[855,856,857,858,859],"M520 128h8v84h-8z","M528 132h62v76h-62z","M590 128h8v84h-8z","M540 124h10v8h-10z","M570 124h10v8h-10z",[861,862],"M548 136h10v68h-10z","M528 170L548 170",[864,875,881,885,890,895,906,913,920,925,930,938],{"partNumber":865,"name":866,"subcategory":56,"subcategoryName":57,"shortDescription":867,"image":868,"inStock":659,"zone":239,"compatibleMachines":869},"HY-PW-08","Hydraulic Plasticizing Motor (NHM Series)","NHM series radial piston hydraulic motor for injection molding machine screw pre-plasticizing drive.","\u002Fpart-images\u002FHY\u002FHY-PW-08\u002F645d799a9f5ee20c3b263ff905392b3f.jpg",[870,871,872,873,874],"Haitian MA Series","Haitian MA II Series","Haitian MA III Series","Yizumi A5 Series","Chen Hsong JM Series",{"partNumber":755,"name":876,"subcategory":67,"subcategoryName":68,"shortDescription":877,"image":878,"inStock":659,"zone":232,"compatibleMachines":879},"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",[870,871,880,873],"Haitian Jupiter Series",{"partNumber":770,"name":882,"subcategory":67,"subcategoryName":68,"shortDescription":883,"image":878,"inStock":659,"zone":232,"compatibleMachines":884},"Injection Screw","Replacement injection screw for injection molding machine plasticizing unit.",[870,871],{"partNumber":848,"name":886,"subcategory":67,"subcategoryName":68,"shortDescription":887,"image":888,"inStock":659,"zone":239,"compatibleMachines":889},"Injection Cylinder","Injection hydraulic cylinder for injection molding machine injection unit.","\u002Fpart-images\u002FMC\u002FMC-BC-06\u002F90T.jpg",[870,871],{"partNumber":722,"name":891,"subcategory":67,"subcategoryName":68,"shortDescription":892,"inStock":659,"zone":232,"compatibleMachines":893},"Injection Nozzle","Precision-machined injection nozzle for plastic injection molding machines.",[871,894,872],"Haitian MA IIS Series",{"partNumber":738,"name":896,"subcategory":67,"subcategoryName":68,"shortDescription":897,"inStock":659,"zone":232,"compatibleMachines":898},"Barrel Front Flange (Front Head)","Barrel front flange (front head) for Haitian MA series injection molding machines.",[899,900,901,902,903,904,905],"Haitian MA250T","Haitian MA280T","Haitian MA320T","Haitian MA380T","Haitian MA470T","Haitian MA300T","Haitian MA360T",{"partNumber":907,"name":908,"subcategory":81,"subcategoryName":909,"shortDescription":910,"image":911,"inStock":659,"zone":239,"compatibleMachines":912},"MC-GZ-01","Injection Piston Rod","Shafts & Rods","Injection unit piston rod for injection molding machine injection cylinder.","\u002Fpart-images\u002FMC\u002FMC-GZ-01\u002Fpistion.png",[870,871],{"partNumber":756,"name":914,"subcategory":72,"subcategoryName":915,"shortDescription":916,"image":917,"inStock":659,"zone":232,"compatibleMachines":918},"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",[870,919,871],"Haitian MA1600",{"partNumber":921,"name":922,"subcategory":72,"subcategoryName":915,"shortDescription":923,"inStock":659,"zone":239,"compatibleMachines":924},"MC-SB-07","Piston Rod Seal Set","Piston rod seal set for injection molding machine hydraulic cylinders.",[870,871],{"partNumber":926,"name":927,"subcategory":72,"subcategoryName":915,"shortDescription":928,"inStock":659,"zone":239,"compatibleMachines":929},"MC-SB-08","Hydraulic Cylinder Seals & Y-Ring","Hydraulic cylinder seal kits and Y-ring piston rod seals for injection molding machine cylinders.",[870,871,873,874],{"partNumber":931,"name":932,"subcategory":72,"subcategoryName":933,"shortDescription":934,"inStock":659,"zone":239,"compatibleMachines":935},"MC-SB-10","Piston Rod Nut","Cylinders & Seals","Injection cylinder piston rod nut for Haitian and equivalent injection molding machines.",[870,871,872,936,937],"Haitian PL Series","Haitian HTF Series",{"partNumber":939,"name":940,"subcategory":115,"subcategoryName":941,"shortDescription":942,"inStock":659,"zone":239,"compatibleMachines":943},"MC-SG-08","Linear Guide Rail & Slider","Guides & Slides","Linear guide rail and slider block for injection molding machine injection unit or carriage.",[870,871],1793548975104]