[{"data":1,"prerenderedAt":784},["ShallowReactive",2],{"catalog:meta":3,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure:*":258,"guides:topics:barrel-screw:\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure:path,title,short":549,"guides:page:\u002Finjection-molding-machine-parts\u002Fbarrel-screw:diagram":602,"diagram:id:injection-unit":603,"catalog:parts::MC-BC-02":776},{"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":521,"diagram":522,"extension":523,"faq":524,"item":537,"lastModified":538,"meta":539,"navigation":540,"order":160,"parts":541,"path":543,"seo":544,"seoTitle":545,"short":546,"stem":547,"__hash__":548},"guides\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure.md","Back pressure in injection molding: what it does and how to set it",{"type":262,"value":263,"toc":511},"minimark",[264,268,277,282,285,312,317,328,332,409,416,420,441,445,486,494,498],[265,266,267],"p",{},"Back pressure in injection molding is the resistance the machine applies against the screw while it turns and moves backward during screw recovery. The melt collecting in front of the screw has to build up that pressure before it can push the screw back, so it is compacted and mixed more thoroughly. Higher back pressure gives a denser, more even melt and more consistent shots, but it also lengthens recovery, adds shear heat and increases wear on the screw, the check ring and the barrel.",[265,269,270,271,276],{},"Back pressure acts on the screw, item 4 in the drawing. For how screw recovery fits into the cycle, 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-the-machine-creates-back-pressure","How the machine creates back pressure",[265,283,284],{},"During recovery, the melt pushes the screw backward, and the screw pushes the piston of the injection cylinder back with it.",[286,287,288,306],"ul",{},[289,290,291,295,296,300,301,305],"li",{},[292,293,294],"strong",{},"Hydraulic machines."," The oil pushed out of the ",[272,297,299],{"href":298},"\u002Finjection-molding-machine-parts\u002Finjection-unit\u002Finjection-cylinder\u002F","injection cylinder"," has to pass a pressure control valve. Depending on the machine, this is a ",[272,302,304],{"href":303},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fproportional-valve\u002F","proportional valve"," set from the controller or an adjustable back pressure valve set by hand. The valve holds the oil at the set pressure, and that pressure resists the screw's movement.",[289,307,308,311],{},[292,309,310],{},"Electric machines."," The injection servo motor holds a controlled force against the screw as it moves back, and the setting is often entered directly as melt pressure.",[313,314,316],"h3",{"id":315},"hydraulic-and-specific-back-pressure","Hydraulic and specific back pressure",[265,318,319,320,323,324,327],{},"On hydraulic machines the setting is usually an oil pressure. The pressure in the melt, called the ",[292,321,322],{},"specific"," back pressure, is higher: it equals the hydraulic pressure multiplied by the ",[292,325,326],{},"intensification ratio",", the area of the injection piston divided by the cross-section of the screw. The ratio is typically about 10:1, but it differs between machines and between screw diameters on the same injection unit, so take it from the machine data. Always state which kind of pressure you mean when you compare settings between machines.",[278,329,331],{"id":330},"what-back-pressure-does","What back pressure does",[333,334,335,350],"table",{},[336,337,338],"thead",{},[339,340,341,344,347],"tr",{},[342,343],"th",{},[342,345,346],{},"Too low",[342,348,349],{},"Too high",[351,352,353,365,376,387,398],"tbody",{},[339,354,355,359,362],{},[356,357,358],"td",{},"Melt",[356,360,361],{},"Air and gas stay in the melt, giving splay and bubbles; unmelted pellets; poor color mixing",[356,363,364],{},"Extra shear heat raises the melt temperature; heat-sensitive materials degrade, giving burn marks and black specks",[339,366,367,370,373],{},[356,368,369],{},"Shot",[356,371,372],{},"Shot weight varies from shot to shot",[356,374,375],{},"Consistent, but the nozzle may drool",[339,377,378,381,384],{},[356,379,380],{},"Cycle",[356,382,383],{},"Short recovery",[356,385,386],{},"Long recovery, which can become longer than the cooling time and extend the cycle",[339,388,389,392,395],{},[356,390,391],{},"Materials with fibers",[356,393,394],{},"Fibers less damaged",[356,396,397],{},"Glass fibers are broken into shorter lengths",[339,399,400,403,406],{},[356,401,402],{},"Wear",[356,404,405],{},"Low",[356,407,408],{},"More wear on the screw, check ring and barrel",[265,410,411,412,415],{},"Back pressure also works with ",[292,413,414],{},"screw speed",": both add shear heat, so a change in one often calls for a change in the other.",[278,417,419],{"id":418},"how-to-set-back-pressure","How to set back pressure",[421,422,423,426,429,432,435,438],"ol",{},[289,424,425],{},"Start from the material supplier's recommendation, or from a low value as the machine manual suggests.",[289,427,428],{},"Set the screw speed so that recovery finishes before the end of the cooling time, with some time to spare.",[289,430,431],{},"Raise the back pressure in small steps, watching shot weight, cushion, color mixing and splay. Stop when the parts are consistent.",[289,433,434],{},"After each change, check the recovery time and the melt temperature, for example by measuring an air shot with a melt probe.",[289,436,437],{},"Set decompression (suck-back) after recovery to relieve the pressure in front of the screw and stop drool. Too much decompression draws air into the nozzle.",[289,439,440],{},"If the controller allows a back pressure profile over the stroke, use it only when a single value does not work.",[278,442,444],{"id":443},"back-pressure-problems-and-their-causes","Back pressure problems and their causes",[286,446,447,458,464,470,480],{},[289,448,449,452,453,457],{},[292,450,451],{},"Recovery time gets longer at the same settings."," Feeding problems at the ",[272,454,456],{"href":455},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fhopper-and-feed-throat\u002F","hopper and feed throat",", a cold heating zone, or a worn screw and barrel.",[289,459,460,463],{},[292,461,462],{},"The back pressure reading fluctuates or will not hold the set value."," On hydraulic machines, a sticking or worn pressure control valve, contaminated oil, or a faulty pressure transducer; on electric machines, a drive or sensor fault.",[289,465,466,469],{},[292,467,468],{},"The screw turns but does not move back."," No material is reaching the screw: an empty hopper, a closed slide gate or bridged pellets.",[289,471,472,475,476,276],{},[292,473,474],{},"Drool and stringing."," Back pressure too high, decompression too low, or the nozzle too hot. See ",[272,477,479],{"href":478},"\u002Fblog\u002Finjection-nozzle-problems-troubleshooting\u002F","nozzle drooling, stringing and blockages",[289,481,482,485],{},[292,483,484],{},"Splay or bubbles that back pressure does not cure."," Often moisture in the material, which needs drying rather than more back pressure.",[265,487,488,489,493],{},"Before changing settings to make up for a machine that has become inconsistent, check the ",[272,490,492],{"href":491},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fcheck-ring\u002F","check ring",": a leaking non-return valve causes unstable cushions that no back pressure setting will fix.",[278,495,497],{"id":496},"parts-that-control-back-pressure","Parts that control back pressure",[265,499,500,501,505,506,510],{},"On hydraulic machines, back pressure depends on the pressure control valve, the injection cylinder seals and the oil condition. See the ",[272,502,504],{"href":503},"\u002Fparts\u002Fhy-cv-04\u002F","proportional pressure and flow valves"," we supply. ",[272,507,509],{"href":508},"\u002Frequest-quote\u002F","Request a quote"," with the machine model and the valve or cylinder details.",{"title":512,"searchDepth":21,"depth":21,"links":513},"",[514,517,518,519,520],{"id":280,"depth":21,"text":281,"children":515},[516],{"id":315,"depth":113,"text":316},{"id":330,"depth":21,"text":331},{"id":418,"depth":21,"text":419},{"id":443,"depth":21,"text":444},{"id":496,"depth":21,"text":497},"What back pressure is in injection molding, how the machine creates it, how it affects melt quality, recovery time and wear, and how to set and troubleshoot it.",null,"md",[525,528,531,534],{"question":526,"answer":527},"What is back pressure in injection molding?","Back pressure is the resistance the machine applies against the screw as it turns and moves backward during screw recovery. The melt in front of the screw has to build up that pressure before it can push the screw back, which makes it denser and better mixed.",{"question":529,"answer":530},"What happens if back pressure is too high?","Recovery takes longer, the melt gets hotter from extra shear, heat-sensitive materials can degrade, the nozzle may drool, glass fibers are shortened, and the screw, check ring and barrel wear faster.",{"question":532,"answer":533},"What is the difference between hydraulic and specific back pressure?","Hydraulic back pressure is the oil pressure set in the injection cylinder. Specific back pressure is the resulting pressure in the melt in front of the screw: the hydraulic value multiplied by the machine's intensification ratio.",{"question":535,"answer":536},"Does back pressure wear the screw and check ring?","Yes, at high settings. Higher back pressure raises the pressure and shear the screw works against during recovery, which increases wear on the screw flights, the check ring and the barrel. Use the lowest setting that gives consistent parts.","screw","2026-11-01",{},true,[542],"MC-BC-02","\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure",{"title":260,"description":521},"Injection Molding Back Pressure: What It Does, How to Set","Back pressure","injection-molding-machine-parts\u002Fbarrel-screw\u002Fback-pressure","7QYUYaENaDdOHuWDqH8211JPPpx2B6DZyH-0okdL2T8",[550,554,558,562,566,570,574,578,582,586,590,594,598],{"path":551,"title":552,"short":553},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew","Injection molding screw: parts, zones and types","Screw",{"path":555,"title":556,"short":557},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel","Injection molding machine barrel: construction, zones and wear","Barrel",{"path":559,"title":560,"short":561},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fcheck-ring","Check ring (non-return valve) of an injection molding screw","Check ring",{"path":563,"title":564,"short":565},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fscrew-tip","Screw tip of an injection molding machine: types and removal","Screw tip",{"path":567,"title":568,"short":569},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle","Injection molding machine nozzle: tip, size and design","Nozzle",{"path":571,"title":572,"short":573},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshut-off-nozzle","Shut-off nozzle for injection molding: types and uses","Shut-off nozzle",{"path":575,"title":576,"short":577},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fnozzle-filter","Injection molding nozzle filter: types, use and cleaning","Nozzle filter",{"path":579,"title":580,"short":581},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbarrel-head","Barrel head (front flange) of an injection molding machine","Barrel head",{"path":583,"title":584,"short":585},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fhopper-and-feed-throat","Hopper and feed throat of an injection molding machine","Hopper and feed throat",{"path":587,"title":588,"short":589},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fbimetallic-barrel","Bimetallic barrel and screw for injection molding machines","Bimetallic barrel",{"path":591,"title":592,"short":593},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fl-d-ratio","Screw L\u002FD ratio and compression ratio in injection molding","L\u002FD ratio",{"path":595,"title":596,"short":597},"\u002Finjection-molding-machine-parts\u002Fbarrel-screw\u002Fshot-size","Shot size calculation for injection molding machines","Shot size calculation",{"path":599,"title":600,"short":601},"\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":604},{"title":605,"description":606,"base":607,"labels":618,"items":629},"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":608,"line":610},[609],"M470 118h14v104h-14z",[611,612,613,614,615,616,617],"M484 124L520 124","M484 216L520 216","M142 212L466 212","M142 207L142 217","M240 207L240 217","M340 207L340 217","M466 207L466 217",[619,623,626],{"x":620,"y":621,"text":622},191,228,"METERING",{"x":624,"y":621,"text":625},290,"COMPRESSION",{"x":627,"y":621,"text":628},403,"FEED",[630,645,662,677,706,719,743,756],{"id":631,"name":569,"role":632,"parts":633,"marker":635,"shapes":639},"nozzle","Screws into the front of the barrel and seals against the mold’s sprue bushing. The melt passes through it on every shot.",[634],"MC-BC-07",[636,637,636,638],52,24,156,{"solid":640,"hidden":643},[641,642],"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",[644],"M34 170L88 170",{"id":646,"name":647,"role":648,"parts":649,"marker":651,"shapes":654},"front-flange","Barrel front flange","Also called the front head or end cap. It closes the front of the barrel and holds the nozzle.",[650],"MC-BC-08",[652,637,652,653],98,144,{"solid":655,"line":657,"hidden":660},[656],"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",[658,659],"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",[661],"M90 170L108 170",{"id":663,"name":557,"role":664,"parts":665,"marker":668,"shapes":671},"barrel","Thick steel tube the screw turns in. Bimetallic barrels have a hard alloy lining that resists wear from glass-filled and abrasive plastics.",[666,667],"MC-BC-01","MC-SB-01",[669,637,669,670],188,146,{"solid":672,"line":674},[673],"M108 146h362v48h-362z",[675,676],"M108 156L470 156","M108 184L470 184",{"id":537,"name":553,"role":678,"parts":679,"marker":680,"shapes":685},"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.",[542],[681,682,683,684],230,336,232,178,{"solid":686,"line":689},[687,688],"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",[690,691,692,693,694,695,696,697,698,699,700,701,702,703,704,705],"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":707,"name":708,"role":709,"marker":710,"shapes":714},"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.",[711,682,712,713],122,128,183,{"solid":715},[716,717,718],"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":720,"name":721,"role":722,"subcategory":28,"marker":723,"shapes":727},"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.",[724,637,725,726],330,313,138,{"solid":728},[729,730,731,732,733,734,735,736,737,738,739,740,741,742],"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":744,"name":585,"role":745,"marker":746,"shapes":749},"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.",[747,637,747,748],446,62,{"solid":750,"hidden":753},[751,752],"M410 62L482 62L462 110L430 110Z","M434 110h24v36h-24z",[754,755],"M434 146L434 156","M458 146L458 156",{"id":757,"name":758,"role":759,"parts":760,"subcategory":72,"marker":762,"shapes":766},"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.",[761],"MC-BC-06",[763,637,764,765],556,560,132,{"solid":767,"hidden":773},[768,769,770,771,772],"M520 128h8v84h-8z","M528 132h62v76h-62z","M590 128h8v84h-8z","M540 124h10v8h-10z","M570 124h10v8h-10z",[774,775],"M548 136h10v68h-10z","M528 170L548 170",[777],{"partNumber":542,"name":778,"subcategory":67,"subcategoryName":68,"shortDescription":779,"image":780,"inStock":540,"zone":232,"compatibleMachines":781},"Injection Screw","Replacement injection screw for injection molding machine plasticizing unit.","\u002Fpart-images\u002FMC\u002FMC-BC-01\u002FMC-BC-02\u002Ffront.jpg",[782,783],"Haitian MA Series","Haitian MA II Series",1793548981272]