https://www.rdraymfginc.com/barrel-temperature-guide daily 0.75 2024-11-14 https://www.rdraymfginc.com/barrier-screw-guide daily 0.75 2024-11-14 https://www.rdraymfginc.com/what-we-do daily 0.75 2025-08-30 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609782917-8U1YIFVKDUGNWBECZXHG/R.+Dray+Mfg.+Globe What We Do https://www.rdraymfginc.com/aps-all-purpose-screw daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609784526-F1Q8A9FQZAFTZ84Q59WA/R.+Dray+All-Purpose+Screw+%28APS%29 APS (all purpose screw) R. Dray All-Purpose Screw (APS) mixing section https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609784519-OHP9M6DGTTAT8IPIYMNN/aps_all_purpose_screw_banner_optimized.jpg APS (all purpose screw) https://www.rdraymfginc.com/inspection daily 0.75 2024-11-14 https://www.rdraymfginc.com/home daily 1.0 2025-08-30 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609785465-M3VM1YZW1YJ0GSC5EQLD/Injection+Molding+Valve+Icon Home Injection Molding Valve Icon https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609785474-GYSH7AZWEUMHOI57673T/Screw+%26+Barrel+Inspection+Icon Home Screw & Barrel Inspection Icon https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609785462-IIOC3VH1KQG1Y07KQQXC/feed+screw+icon Home Feed Screw Icon https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609785471-DODVSHS710RW6LNCTQ7N/Screw+%26+Barrel+Rebuilding+Icon Home Screw & Barrel Rebuilding Icon https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609785446-GMDFQKJLMROS49Z3UM4U/Home_banner_screw_optimized.jpg Home https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609785452-8I6Y5K55WX91HDE0QQUY/apv_home_banner_optimized.jpg Home https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609785468-EB35ENDX6ORXFSVDAANF/Barrel+Icon Home Barrel Icon https://www.rdraymfginc.com/how-to-compare-barrier-screws daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609788451-QGK7SX4Y97IB6TMM8ICP/melt-capacity-graph_optimized.jpg How to Compare Barrier Screws 4.5" screw diameter processing LDPE https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609788434-Q0GZ9RPW0L3W67EVOALT/Barrier+screw+section How to Compare Barrier Screws Computer simulations are based on the idea that the area of the primary melting channel is the key influence on a barrier screw's melting capacity, though depth of the channel also plays a role. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609788448-DREBM7R937C0NXMU88ZP/Unwrapped+Wheeler+%28DSB-1%29+Barrier+section How to Compare Barrier Screws Screw Diam. = 4.492 in. Primary Lead = 6.30 in. Barrier Lead = Varies Axial Barrier Length = 45 in. Helical Length = 107.42 in. Average Channel Width = 3.053 in. Melting Area = 3.053 X 107.42 = 328 sq in. Melting Capacity (LDPE) = 617 lb/hr Wheeler's DSB-1 barrier for Davis-Standard borrows from Maillefer, Schippers/Barr, and Dray. It uses three different lead widths, which reduces the melting area. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609788431-N9ZDPTT8COGUHHHFPLQ9/R.+Dray+Barrier+Screw+design How to Compare Barrier Screws R. Dray Barrier Screw (left hand Engel injection screw) https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609788437-7F6RJ6DSSR9HEL3AQMHN/Unwrapped+Maillefer+Barrier+section How to Compare Barrier Screws Screw Diam. = 4.492 in. Primary Lead = 4.500 in. Barrier Lead = 4.9038 in. Axial Barrier Length = 45 in. Helical Length = 148.75 in. Average Solids Channel Width = 1.9247 in. Melting Area = 1.9247 X 148.73 = 286.27 sq in. Melting Capacity (LDPE) = 539 lb/hr The Maillefer barrier, patented in 1967, was the first melt separation device. It retains solids in the primary channel, eliminating the break-up of the solids bed and improving melting capacity and melt quality. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609788441-Y8GKWYUJDD3MZCT6IAZN/Unwrapped+Schippers%2FBarr+Barrier+section How to Compare Barrier Screws Screw Diam. = 4.492 in. Primary Lead = 4.500 in. Barrier Lead = 4.500 in. Axial Barrier Length = 45 in. Helical Length = 148.10 in. Primary Channel Width = 2.500 in. Melt Channel Width = 1.149 in. Melting Area = 2.500 X 148.10 = 370.25 sq in. Melting Capacity (LDPE) = 697 lb/hr The Schippers/Barr primary melting channel gets shallower as the auxiliary channel deepens. A straight primary flight increases melting area in contact with the barrel wall, relative to Maillefer's design. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609788444-NMKZR1K7QSR3JFE2Q49H/Unwrapped+Dray+Barrier+section How to Compare Barrier Screws Screw Diam. = 4.492 in. Primary Lead = 6.75 in. Barrier Lead = 6.75 in. Axial Barrier Length = 45 in. Helical Length = 104.29 in. Primary Channel Width = 4.0883 in. Melting Area = 4.0883 X 104.29 = 426.37 sq in. Melting Capacity (LDPE) = 798 lb/hr The width of Dray's primary channel carrying the solids stays the same even after it joins the auxiliary channel, allowing a larger melting area than other barrier designs. https://www.rdraymfginc.com/extrusion-rate-loss-calculator daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609789451-ZCCLMVHVA0L11TQX6XQP/feedscrew+lead+and+flight+width+example Extrusion Rate Loss Calculator Flight width and screw lead example https://www.rdraymfginc.com/screw-rebuilding daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609790286-U2X9Y4NDE1E6P3DHCJA9/hand+holding+wrench+icon Screw and Barrel Rebuilding/Repair Icon of hand holding a wrench https://www.rdraymfginc.com/general-purpose daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609791070-670SOAH8RG5JM7ZYCD5W/Figure-3_Mixer_optimized.jpg General Purpose Screw Designs Figure 3 mixing section of feedscrew https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609791064-LIRW57TBIG56BZTSOH7V/Unwrapped+Conventional+Screw+Design General Purpose Screw Designs Figure 1 Unwrapped Conventional Screw Design https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609791067-SGEC2IE7GLUOIF14YAYC/Figure+2+unwrapped+Miallefer+barrier+screw General Purpose Screw Designs Figure 2 unwrapped Miallefer barrier screw https://www.rdraymfginc.com/multi-flighted-vent daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609791985-FBEIAK2W6UUUNJFW6INM/R.+Dray+MFV+%28multi-flghted+vent%29+section MFV (multi-flighted vent) R. Dray MFV (multi-flighted vent) section https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609791979-PD1RRX7POWUQOZ2DSC12/mfv_banner_optimized.jpg MFV (multi-flighted vent) https://www.rdraymfginc.com/adjustable-barrier-screw daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609792861-RXGD7R3NZOHDQ5W9HTF7/R.+Dray+barrier+screw+design Removable Dams R. Dray barrier screw (left hand Engel injection screw)- click to enlarge https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609792864-9ON385FDLVHACUYSRDYA/R.+Dray+removable+dam+barrier+screw+exploded+view Removable Dams Removable Dams allow for pressure profile optimization - click to enlarge https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609792867-YIDRGXMLA77E0AO55Y6B/R.+Dray+Removable+Dams Removable Dams Sets of removable dams of varying heights are provided to allow for screw optimization https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609792854-O7SFNRE33ZY6MDC7DBIY/barrier-banner_optimized.jpg Removable Dams https://www.rdraymfginc.com/contact-us daily 0.75 2024-11-14 https://www.rdraymfginc.com/barrels daily 0.75 2024-11-14 https://www.rdraymfginc.com/apv-all-purpose-valve daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609793889-NSZV4J92KT0FC5CCQ2UX/R.+Dray+APV+non-return+valve+standard+option APV (all purpose valve) click to enlarge https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609793895-2VFMWTDDD7L171W8V4L3/R.+Dray+interlocking+APV+non-return+valve APV (all purpose valve) click to enlarge https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609793892-0W0ZN5SCRUU38CUMEM2O/R.+Dray+APV+mixing+valve APV (all purpose valve) click to enlarge https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609793877-J523XM2GL8XGV5JH3IRG/Dray+APV+sliding+closure APV (all purpose valve) APV sliding closure https://www.rdraymfginc.com/injection-molding-cost-cutting-strategies daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609795849-GJOC2XZW96S1J4ER353F/image-asset.png Cost-Cutting Strategies Increasing throughput rate offers the greatest cycle time improvement. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609795842-CQU5U3C3VJ2FZ1Y6IXCK/image-asset.png Cost-Cutting Strategies When determining the hourly cost of a molding machine, use machine data and financial statements to obtain the parameters above. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609795853-BM7ENS7UDOGYFTNXKS9Y/image-asset.png Cost-Cutting Strategies In this graph plotting viscosity vs. shear rate for a typical plastic, we see that plastics change viscosity relative to injection rate (mm/sec or in/sec). To have a stable process, fill time or injection rate must be kept constant. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609795863-389XYZE5P7TQSBLNAODP/image-asset.png Cost-Cutting Strategies https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609795845-41NRX6SU5W8WAANKV1RR/image-asset.png Cost-Cutting Strategies In this example of what 2 saved seconds of cycle time can do for the bottom line, this molder making proprietary parts can increase productivity by 21.3% without increasing machine operating hours. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609795856-XU21JI5XD5KXLI927KGB/image-asset.png Cost-Cutting Strategies To keep constant fill time, or have velocity control, the machine must have more power available than what it is using; delta P must be maintained and abundant pressure used. This is similar to a car on cruise control. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609795860-J2P4LC5G33C5RRS8BJJU/image-asset.png Cost-Cutting Strategies In a two-extruder layout, the second extruder can be used for coinjection or for injecting more of the same resin in large shot sizes. https://www.rdraymfginc.com/dray-mixer daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609796849-85PL4E4NQWUGT1PQAPLV/Dray+Mixer+flow+paths Dray Mixer (triangle mixer) - True Distributive Mixing Dray Mixer flow paths https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609796852-QGTIT7WZ05BA4HDUNFMK/Dray+Mixer+block+clearance Dray Mixer (triangle mixer) - Melt Quality Dray Mixer block clearance https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609796843-7PF4KVV78SI6IDIXTU2S/first.png Dray Mixer (triangle mixer) https://www.rdraymfginc.com/repeater daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609798640-BVK51UY658AN3G7EFCKT/R.+Dray+Repeater+injection+molding+non-return+valve+cross+section+in+open+position Repeater Figure 1: Repeater in the open position https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609798655-WUU1QFU5TSKCXA4023TS/R.+Dray+Repeater+injection+molding+non-return+valve+cross+section+in+closed+position Repeater click to enlarge https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609798647-OA7RJEREI9U1O7RKS707/R.+Dray+Repeater+injection+molding+valve+isometeric+view Repeater click to enlarge https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609798644-XBDO5PWGV41XNPJACYED/R.+Dray+Repeater+injection+molding+non-return+valve+cross+section+in+closed+position Repeater Figure 2: Repeater in the closed position https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609798651-JJAZ2RPASQB3PP4MR6G9/R.+Dray+Repeater+injection+molding+valve+cross+section+open+position Repeater click to enlarge https://www.rdraymfginc.com/injection-molded-physical-properties daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609799655-2JTU0XW82415YF8G2ZP4/image-asset.png Injection Molded Part Physical Properties Figure 1: Effect of melt temperature on retained MFR for PBT polyester. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609799652-4H9KU8M1JGQG6PXX4A00/image-asset.png Injection Molded Part Physical Properties https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609799658-F4NM6I661ULO2JB81795/image-asset.png Injection Molded Part Physical Properties Figure 2: Effect of melt temperature on MFR of repeatedly processed PP. https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609799661-R1MVHQ5YDH52P4I0VSSZ/image-asset.png Injection Molded Part Physical Properties Figure 3: Effect of melt temperature and moisture content on retained of melt viscosity of PET polyester. https://www.rdraymfginc.com/hopper-block daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609800621-Z8DNUQLY7EVG269VSSFC/Worn+Brass+Sleeve+in+Extruder+Hopper Hopper Block Worn brass sleeve in extruder hopper casting https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609800618-BQ5M5ET78T2MOZ2V3GPI/R.+Dray+Hopper+Block Hopper Block R. Dray Hopper Block design https://www.rdraymfginc.com/barrier-screws daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609801487-ROXSIXPO1VFX7ZEG7TPT/R.+Dray+Barrier+Screw+Design Barrier Screws Figure 1 - R. Dray barrier screw (left hand Engel injection screw) https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609801490-0QOHLHKJU01HZ6MO7TRM/Close+up+view+of+R.+Dray+Barrier+Screw Barrier Screws Figure 2 - Maintained primary channel width (left hand Engel injection screw) https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609801493-XFJ1UGQJD5AG9REFL4PF/Graph+of+barrier+screw+melt+capacity Barrier Screws 4.5" screw diameter processing LDPE - click to enlarge https://www.rdraymfginc.com/feedscrews daily 0.75 2025-08-30 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802400-CBET3MFWU4JPBQ9MULJJ/barrier-close_landing-page.jpg Injection Molding Screws & Extrusion Screws https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802419-Z7WZVO40Q3X5NJ8IAL9D/mfv_landing-page.jpg Injection Molding Screws & Extrusion Screws https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802404-KUDF5LQ246NXH3F8ADIT/dray-mixer_landing-page.jpg Injection Molding Screws & Extrusion Screws https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802413-Q7HCBB481YKK9TV9YQON/aps_all_purpose_screw_landing-page.jpg Injection Molding Screws & Extrusion Screws https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802422-A0LRELT8JS6OPA98BJTL/removable-dam-explode_landing-page.jpg Injection Molding Screws & Extrusion Screws https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802407-W1C0634G9SM52KNDKT9B/valve-icon_smaller_optimized.jpg Injection Molding Screws & Extrusion Screws https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802416-KEDT4TMXZOLIFFE6RKTV/w-mixer_landing-page.jpg Injection Molding Screws & Extrusion Screws https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609802410-G67BOAOYOPYZHEUHZTTJ/vi1-mixer_landing-page.jpg Injection Molding Screws & Extrusion Screws https://www.rdraymfginc.com/why-your-company-is-losing daily 0.75 2024-11-14 https://www.rdraymfginc.com/trouble-with-traditional-valves daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609803458-49L3969KQ2IKEFAQ3J3C/Injection+molding+check+ring+free+flow+valve+leakage Types of Injection Molding Valves Fig. 2 Yellow arrows display leakage during injection as ring valve closes https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609803453-CZTB5RVUS36WN0GH94OA/Injection+molding+ball+valve+leakage Types of Injection Molding Valves Fig. 1 Yellow arrows display leakage during injection as ball valve closes https://www.rdraymfginc.com/vi1-mixer daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609804280-30FLZ4IHBW6NNTTUJUVM/R.+Dray+VI1+Mixer+flow+paths VI1 Mixer - True Distributive Mixing R. Dray VI1 Mixer flow paths https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609804284-12PW9MZV45IC859GPPET/R.+Dray+VI1+Mixing+section VI1 Mixer - Melt Quality R. Dray VI1 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609804273-9AJ82KIIXKAKBY1CB3CH/vi1-mixer_banner_optimized.jpg VI1 Mixer https://www.rdraymfginc.com/injection-molding-rate-loss-calculator daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609805131-YBGCA6GM6744G1VJIPDT/feedscrew+lead+and+flight+width+example Injection Molding Rate Loss Calculator Flight width and screw lead example https://www.rdraymfginc.com/sw-mixer daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609806834-JHN76ZRKV05C0RQ8KZXR/R.+Dray+SW+Mixing+section SW Mixer - Melt Quality SW Mixing section https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609806831-JI61S5M3TKB7RUWC1642/R.+Dray+SW+flow+paths SW Mixer - True Distributive Mixing R. Dray SW flow paths https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609806824-AHH0123J1PSTGKUOBEA3/sw-mixer_banner_optimized.jpg SW Mixer https://www.rdraymfginc.com/melt-density daily 0.75 2024-11-14 https://www.rdraymfginc.com/w-mixer daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609807749-OUGT3JBLO9ZBBTZXM4TZ/R.+Dray+MFV+%28multi-flighted+vent%29 W Mixer R. Dray W Mixer attached to MFV (multi-flighted vent) section https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609807746-ITCTJCVGQI9XJZO5HAEW/R.+Dray+W+Mixing+section W Mixer R. Dray W Mixer https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609807740-ZCOGPV6FIQBJHO3GH6TE/w-mixer_banner_optimized.jpg W Mixer https://www.rdraymfginc.com/injection-molding-screw-design daily 0.75 2024-11-14 https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609808593-WFYNW7O2V24HAYCLRCJJ/Figure+3 Injection Molding Screw Design https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609808596-7F8AX3B00PJHI67FWOEU/Figure+4 Injection Molding Screw Design https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609808583-D0Y3HVWZVP9XIN7ZP9LI/Figure+2 Injection Molding Screw Design https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609808590-QSYG0DJ65B07P8A1CGT4/Figure+3 Injection Molding Screw Design https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609808586-TOC8IQP55D4S77LEYSKF/Graph+2 Injection Molding Screw Design https://images.squarespace-cdn.com/content/v1/673644b6a9f62b6794e29a96/1731609808579-ZEK0V6TCC5Z9H1CE667L/graph+1 Injection Molding Screw Design