http://www.glycon.com/feed-screw-non-return-valve-terms-glossary
Glycon Corp. is an innovator in the design and manufacturing of feed screws, barrels, non-return valves and other melt stream solutions for injection molding, extrusion and blowmolding.
I tried to cover as much information as possible from various sources about manufacturing , properties and various wheel defects in wheels of trains in railway indutsry
I tried to cover as much information as possible from various sources about manufacturing , properties and various wheel defects in wheels of trains in railway indutsry
Design aids for tension members as per revised is 800 2007eSAT Journals
Abstract The B.I.S. recently revised the new IS: 800-2007 . This is based on limit state method. This new code includes variety in elements like tension members, compression members , flexural members, combined connection, combined axial and bending design of members. The B.I.S. has yet not published any design aids based on new IS: 800-2007. For saving time in various design of structural steel section, one need to have their own computer programme or design aids or spreadsheet which is based on IS: 800-2007. In this research we have developed excel programme spreadsheet to analyze & design tension members, which will help the structural designer to save their time in designs. Also we have prepared design aids to find out the capacity on angled tension member with single row of bolts connected to the gusset plate. Keywords: Tension members, Design aids , IS:800-2007 , Analysis , Designing , Spreadsheet, Structural steel
This is a Power Point Presentation discussing briefly about the Slab, Beam & Column of a building construction. It was presented on 6th March, 2014 as part of the Presentations of the subject: DETAILS OF CONSTRUCTION, at Ahsanullah University of Science & Technology (AUST)
I'm Irfan Nasir. Currently studying Civil Engineering at Mehran University of Engineering and Technology. This is a slide made by me on Defects in rails from the subject Transportation Engineering.
As screw designs have evolved through the years, there are several generic categories that
single (as opposed to twin) screws can be divided into:
A.) Single flighted; (conventional) screws
B.) Mixing screws
C.) Barrier screws
D.) Distributive mix/melt screws
Contact Glycon at (800) 255-9969 for more information. Get a fast quote http://www.glycon.com/quote
Glycon Corp. is an innovator in the design and manufacturing of feed screws, barrels, non-return valves and other melt stream solutions for injection molding, extrusion and blowmolding.
For more than 30 years, Glycon Corp. has focused on helping our customers to become better, more efficient processors. Our current family of advanced technologies are all designed specifically to improve throughput, increase quality, reduce scrap and streamline processing. Whether your application is simple or complex, we can help improve your machine efficiency, part quality and reliability.
Product & Process Development
As processors gear up for production on a new project, Glycon's dedicated Product Development Center has the resources to help optimize screw performance, testing several different designs and then zeroing in on the best melting and mixing combination. Or, if a molder is having a problem with splay or burning, or if an extruder is not getting proper mixing or sufficient throughput, technicians at the Center, can reproduce these problems under controlled conditions and quickly find ways to attack the problem through the application of the latest screw and processing technology.
Rebuilding Services
Glycon Corp. experts can help extend the life of costly meltstream components. Feedscrews can be rebuilt to match original performance specifications. Barrels can be resleeved to original dimensions. Other components, like our QSO® non-return valve, can be rebuilt. All done quickly and with the highest standard of quality.
Preventive Maintenance & Installation
Glycon Corp. can assist with setup and maintenance of your feedscrew and related meltstream components. Our 10-Step Field Service Program streamlines setup and checks that your feedscrews are operating correctly. We can also design a maintenance program to reduce downtime and keep your systems operating as efficiently as the day they were installed. And we can train your maintenance personnel or implement the program ourselves.
Our products include:
Distributive Mixing & Melting Screw
Barrier Screws
Feedscrew Rebuilding
General Purpose Feed Screws
Glycon Barrels
QSO Non-Return Valves
Feed Throats
End Caps
Tie Bars & Tie Rods
SmartBarrel
Screw and Barrel
Feed Extruder Screw Design
Field Services
Contact Glycon at (800) 255-9969 for more information.
Get a fast quote http://www.glycon.com/quote
Screw and barrel inspection plays a very important part in achieving exceptional production performance. The screw and barrel are major components of extrusion, injection molding and blow molding processes, and should be measured for wear at least once a year (preferably twice a year). Many U.S. companies schedule preventive maintenance (PM) during the week of Independence Day and again during the week of Christmas.
Design aids for tension members as per revised is 800 2007eSAT Journals
Abstract The B.I.S. recently revised the new IS: 800-2007 . This is based on limit state method. This new code includes variety in elements like tension members, compression members , flexural members, combined connection, combined axial and bending design of members. The B.I.S. has yet not published any design aids based on new IS: 800-2007. For saving time in various design of structural steel section, one need to have their own computer programme or design aids or spreadsheet which is based on IS: 800-2007. In this research we have developed excel programme spreadsheet to analyze & design tension members, which will help the structural designer to save their time in designs. Also we have prepared design aids to find out the capacity on angled tension member with single row of bolts connected to the gusset plate. Keywords: Tension members, Design aids , IS:800-2007 , Analysis , Designing , Spreadsheet, Structural steel
This is a Power Point Presentation discussing briefly about the Slab, Beam & Column of a building construction. It was presented on 6th March, 2014 as part of the Presentations of the subject: DETAILS OF CONSTRUCTION, at Ahsanullah University of Science & Technology (AUST)
I'm Irfan Nasir. Currently studying Civil Engineering at Mehran University of Engineering and Technology. This is a slide made by me on Defects in rails from the subject Transportation Engineering.
As screw designs have evolved through the years, there are several generic categories that
single (as opposed to twin) screws can be divided into:
A.) Single flighted; (conventional) screws
B.) Mixing screws
C.) Barrier screws
D.) Distributive mix/melt screws
Contact Glycon at (800) 255-9969 for more information. Get a fast quote http://www.glycon.com/quote
Glycon Corp. is an innovator in the design and manufacturing of feed screws, barrels, non-return valves and other melt stream solutions for injection molding, extrusion and blowmolding.
For more than 30 years, Glycon Corp. has focused on helping our customers to become better, more efficient processors. Our current family of advanced technologies are all designed specifically to improve throughput, increase quality, reduce scrap and streamline processing. Whether your application is simple or complex, we can help improve your machine efficiency, part quality and reliability.
Product & Process Development
As processors gear up for production on a new project, Glycon's dedicated Product Development Center has the resources to help optimize screw performance, testing several different designs and then zeroing in on the best melting and mixing combination. Or, if a molder is having a problem with splay or burning, or if an extruder is not getting proper mixing or sufficient throughput, technicians at the Center, can reproduce these problems under controlled conditions and quickly find ways to attack the problem through the application of the latest screw and processing technology.
Rebuilding Services
Glycon Corp. experts can help extend the life of costly meltstream components. Feedscrews can be rebuilt to match original performance specifications. Barrels can be resleeved to original dimensions. Other components, like our QSO® non-return valve, can be rebuilt. All done quickly and with the highest standard of quality.
Preventive Maintenance & Installation
Glycon Corp. can assist with setup and maintenance of your feedscrew and related meltstream components. Our 10-Step Field Service Program streamlines setup and checks that your feedscrews are operating correctly. We can also design a maintenance program to reduce downtime and keep your systems operating as efficiently as the day they were installed. And we can train your maintenance personnel or implement the program ourselves.
Our products include:
Distributive Mixing & Melting Screw
Barrier Screws
Feedscrew Rebuilding
General Purpose Feed Screws
Glycon Barrels
QSO Non-Return Valves
Feed Throats
End Caps
Tie Bars & Tie Rods
SmartBarrel
Screw and Barrel
Feed Extruder Screw Design
Field Services
Contact Glycon at (800) 255-9969 for more information.
Get a fast quote http://www.glycon.com/quote
Screw and barrel inspection plays a very important part in achieving exceptional production performance. The screw and barrel are major components of extrusion, injection molding and blow molding processes, and should be measured for wear at least once a year (preferably twice a year). Many U.S. companies schedule preventive maintenance (PM) during the week of Independence Day and again during the week of Christmas.
The chief function of roving frame is the attenuation of sliver.
To draft the sliver to reduce weight per unit length.
Insertion of protective twist in order to hold the fine strand of sliver.
To make conical or tapper shape of the bobbin.
Wind the twisted roving on to the bobbin.
Winding of roving into a package that can be transported, sorted, donned on ring spinning machine.
Manufacturing Technology , Bending Process .
Tackles mainly about the definition of Bending process, how does it work, the machines & equipment used to make it work and the application of Bending on manufacturing Industries.
Please Don't forget to Like before you download the presentation.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
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NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Gen AI Study Jams _ For the GDSC Leads in India.pdf
Feed Screw and Non Return Valve Terms Glossary | Glycon Corp.
1. Feedscrew Terms
{All figures referenced are located at the end of the list of terms.}
“A” Channel – Refers to one of the two flow channels through a DM2
section. The A channel is the melt side of the channel at the beginning of
the section. Depending on the number of peaks, the “A” channel may end
ahead of or behind the “B” channel. {Figure 5}
ASB – Advancing Spiral Barrier. A barrier section in which the secondary flight has a lead
greater than that of the main flight. This causes the secondary flight to gain on the main flight
from behind. The melt channel widens and the solid channel becomes narrower as this section
develops along the screw. {Figure 4}
Auxiliary Flight – a.k.a. Barrier Flight, Secondary Flight, and Undercut Flight.
“B” Channel – Refers to one of the two flow channels through a DM2 section. The B channel is
the solids side of the channel at the beginning of the section. Depending on the number of peaks,
the “B” channel may end ahead of or behind the “A” channel. {Figure 5}
Barrel – The cylinder in which the screw turns, and possibly reciprocates, to melt, mix, and
process materials.
Barrier Flight – The undercut flight through a barrier section. It serves as a barrier between the
melt and solid channels. {Figure 3 & 4}
Barrier Section – A section of the feedscrew, usually in the area just after the feed section, which
divides the melted material from the pellets that are still solid. {Figure 3 & 4}
Belt Polish – Material removal by means of a belt covered with a gritty material. The belts have
various grit classifications relating to how coarse they are. A 320 grit belt is much smoother than
an 80 grit.
Blister – A restriction in the flow of material typically placed at the output end of the screw.
There isn’t usually a flight in this area and the root diameter is increased for a shallower gap
between the screw and barrel. {Figure 6}
Board – To dull the outer surface of a screw and remove irregularities by running a board
covered with a sanding belt over the part.
Buff – To put a high polish on a part using a buffing wheel and a rouge compound.
Butter Layer – A layer of softer material used when hardfacing to allow shifting between the
harder outer layer and the base material of the screw. (a.k.a. Underlay) {Figure 2}
CNC – Computer Numeric Control
1
2. Carbide Coating – A very hard coating applied by a high velocity thermal spray.
Chamfer – A short taper between surfaces. Quite often used to break an edge or to help when
installing parts with close clearances.
Channel – 1. An operation whereas a groove is cut into the part for the application of a
hardfacing alloy. 2.The area of a screw cut away for material to flow in while it is processed.
(a.k.a. Flow Channel.)
Chrome Plate – A surface treatment where chrome is electrodeposited onto the surface from
a solution of chromic acid. Glycon’s triple chrome has three layers of chrome and the part is
polished between each layer’s application.
Colmonoy – A manufacturer of hardfacing materials. Glycon uses Colomonoy 56, 57, and 83 to
hardface many of the screw manufactured.
Compression Ratio – The ratio of feed depth to meter depth. (feed depth ÷ meter depth)
{Figure 1}
Conventionally Flighted – A screw consisting of simple feed, transition, and metering sections
without auxiliary flights. {Figure 1}
Diamond Mixer – A mixer made up of diamonds to break up the material flow through the
section. {Figure 6}
DM2 Section – Distributive Mix/Melt. This section pumps the material back and forth across an
undercut flight while the channels are changing depths between peaks and valleys. {Figure 5}
Drive End – The end of the screw, which is connected to the drive system with a key or keys,
flats, pin, spline, or thread. {Figure 7}
Dy-Clad – An electrodeposited chrome that is very thin and adds lubricity to the surface.
Eagle Mixer – A special mixer, similar to a short ASB, with channels cut across the flights.
{Figure 7}
Feed Depth – Depth of the flow channel in the feed section. {Figure 1}
Feed Pocket – The start of the flow channel where material is fed into the system to be
processed. {Figure 1}
Feed Section – The first section of the flow channel. Typically, the deepest part of a
conventionally flighted screw. {Figure 1}
Fillet Radius – A radius blending two surfaces.
2
3. Flame Harden – A surface treatment with a process of heating the part with a carburizing flame
and quenching to achieve a case hardened surface.
Flank – Refers to the sides of a flow channel. The right flank is the right side of the channel or
the trailing side of the flight. The left flank is the left side of the channel or the push side of the
flight. {Figure 2}
Flash Chrome – A very thin layer of chrome. Typically between .0001” and .0005” thick.
Flight – The part of the feedscrew that pushes material as the screw is turned.
Flight Width – The width of the flight at its outer surface furthest from the screw’s central axis.
{Figure 2}
Flight End – The beginning or ending of a flight. This area is usually tapered to the root either by
a conical taper or simply by blending its tail.
Flight Micrometer (Flight Mic) – A measuring instrument that has been modified with a long bar
on the anvil to span across flights on a screw while the spindle contacts the single flight on the
opposite side. {Figure 9}
Flight Start – The beginning of a main or auxiliary flight.
Flighted Length – The distance from the pocket to the output end of the screw. Although the
flight typically stops before the register or nose taper, the flighted length includes this area.
{Figure 1}
Flute – The groove or flow channel through a mixer.
Gear Mixer – A two-piece mixer consisting of teeth cut into a flange or flanges on the screw and
a ring with teeth cut on its internal diameter (looking a little like an internal gear). {Figure 6}
Hardfacing – Material added to a surface with a welding process to extend its wear life.
(Examples: Colmonoy #56, Colmonoy #57, Colmonoy #83, Stellite #6, and Stellite #12)
{Figure 2}
Heat Treat – A process including heating, quenching, and possibly aging, to increase a
part’s strength, hardness, or toughness. Some heat treatments include cryogenics or sub-zero
temperatures.
Hub – The area directly behind the feed pocket. {Figure 1}
Hub Grooves – Grooves cut into the hub. Typically, these grooves are cut on a spiral with a lead
that is either in the same direction as that of the main flight or opposite to it.
3
4. Hurricane Mixer – A Glycon mixer consisting of multiple channels with changing depths and
interruptions due to channels cut in the opposite direction. {Figure 6}
Induction Harden – A surface treatment with a process of heating the part with an induction coil
and quenching to achieve a case hardened surface.
In-Process Inspection – A step in the procedure at every operation where the operator measures
and records dimensions they have effected at their station.
Involute Spline – A drive type with teeth resembling gear teeth. {Figure 7}
L/D (L over D) – Flighted length divided by the nominal diameter of the screw.
Land – An area without depth or diameter change.
Lathe – A machine used to remove material with a stationary cutting tool while rotating the part.
Lead – The distance a flight is advanced with a single turn or revolution of the screw. Measured
from leading edge to leading edge or trailing edge to trailing edge. The lead can be right hand or
left hand. (a.k.a. Pitch for single flighted screws) {Figure 2}
Leading Edge – The edge of the flight nearest the output of the screw. This is the push side of the
flight. {Figure 2}
Left Flank - The left flank is the left side of the channel or the push side of the flight. {Figure 2}
Long Peak – The first peak after the barrier section in the solids channel and the beginning of the
B channel in the DM2 section. {Figure 5}
Maddock Mixer – A mixer with longitudinal flights, alternating inlet and outlet channels, and
very shallow gaps (undercuts) between the inlet channels and outlet channels. {Figure 6}
Major Diameter – With reference to a spline, it is the outside diameter of the external spline.
With reference to a thread, it is the outside diameter of the external thread. {Figure 7}
Melt Channel – The flow channel behind the barrier flight. Melted material flows over the barrier
flight and into this channel. {Figures 3 & 4}
Meter Depth – Depth of the flow channel in the meter section. {Figure 1}
Meter Section – The last section of the flow channel. Typically the shallowest part of a
conventionally flighted screw. {Figure 1}
MIG – Metal inert-gas welding. Also GMAW (Gas Metal-Arc Welding). An arc welding process
in which the heat for welding is generated by an arc between a consumable electrode and the
work metal. The electrode, a bare solid wire that is continuously fed into the work area, becomes
4
5. the filler metal as it is consumed. The electrode, weld pool, arc, and adjacent areas of the base
metal are protected from atmospheric contamination by a gaseous shield fed through the welding
gun.
Mill – A machine and a process where material is removed by a rotating cutter against the part.
Milled Pocket – A style of feed pocket generated with a ball mill or end mill with a corner
radius. {Figure 1}
Minor Diameter – With reference to a spline, it is the diameter of the area between teeth on an
external spline. With reference to a thread, it is the diameter at the valley between threads of an
external thread. {Figure 7}
Mixer – A section added specifically to mix material. {Figure 6}
Nose – The end opposite of the drive, usually the output end. It may have a conical taper or a
register with threads. {Figure 1}
Nose Threads – Threads at the nose end of the screw.
O.D. (Outer Diameter) – Main O.D. refers to the outer diameter of the main flight of the screw.
{Figure 2}
O.D. Grind – Grinding of the outer most surface of a part by means of a rotating wheel.
Output End – The end of the screw where the material exits the system. It is usually opposite the
drive end, but not always.
PTA – Plasma Transfer Arc welding. Closely related to TIG welding with the plasma level
increased by a constricting orifice (or nozzle) placed around the arc. The result is a higher arc
temperature and a more concentrated heat pattern.
Parallel Barrier – A barrier section where the main and barrier flights have the same lead. The
melt channel gets deeper as the solids channel gets shallower. {Figure 3}
Peak – A shallow point in the DM2 section. {Figure 5}
Pineapple Mixer – Another name for a diamond mixer. {Figure 6}
Pitch – The distance from a point on a flight or thread to the same point on the next flight or
thread. For a screw or a thread with two equally spaced starts, the pitch is one half of the lead. If
there are three starts equally spaced, the pitch is one third of the lead. A square pitch is one that
equals the nominal diameter.
5
6. Pitch Diameter – With reference to a spline, it is the diameter at which the tooth thickness equals
the gap. With reference to threads, it is the diameter at which the thread ridge and groove are of
equal width.
Pocket Line – The line at which the pocket starts. With a tapered or shooting pocket, this is the
pocket start, not the point of full depth. {Figure 1}
Pocket Start – The distance from the drive end to the pocket line.
Profile – The depth information for a flow channel. {Figures 1, 3, & 4}
Register – An area of constant diameter at the end of a part used to mate with a similar diameter
on the adjoining part. {Figure 6}
Right Flank - The right flank is the right side of the channel or the trailing side of the flight.
{Figure 2}
Root – The bottom of the flow channel. {Figure 2}
Root Grind – Grinding of the root area of a screw on a lathe that has been modified to include a
grinding attachment. Various leads are achieved by changing gears in the drive.
Root Radius – The fillet radius between the channel’s root and the flank. {Figure 2}
Secondary Flight – a.k.a. Auxiliary Flight, Barrier Flight, and Undercut Flight.
Shank – The drive portion of the screw. {Figure 1}
Shooting Pocket – A style of feed pocket where the channel is full width, but the depth tapers
from the surface to full feed depth over a given distance. (a.k.a. Tapered Pocket) {Figure 1}
Side Grind – Grinding of the sides of the flight on a lathe that has been modified to include a
grinding attachment. Various leads are achieved by changing gears in the drive.
Slotted Mixer – A restriction resembling a blister but with numerous longitudinal channels cut
through it. {Figure 6}
Solids Channel – The flow channel ahead of the barrier flight. Melted material flows over the
barrier flight leaving this channel. {Figures 3 & 4}
Spiral Mixer – A mixer consisting of multiple flights with alternating inlet and outlet channels.
Spline – A drive type with multiple teeth. Can be involute or straight sided.
Split Ring Groove – A groove cut between the drive and the feed pocket for a close fitting collar
used to pull the screw back during part of the molding cycle.
6
7. Stellite – A manufacturer of hardfacing materials. Stellite 6 and Stellite 12 are materials Glycon
uses regularly.
Stone Belt – A belt polishing technique where the belt has been dressed with a stone to remove
grit from a portion of the belt’s surface to minimize the material removed where this area
contacts the part.
Straight Sided Spline – A drive type with multiple teeth where the teeth have flat, parallel sides.
Surface Treatment – Plating, coating, or conditioning of a part’s surface. (Examples: chrome,
carbide, induction harden, flame harden, and Dy-Clad)
Tapered Pocket – A style of feed pocket where the channel is full width, but the depth tapers
from the surface to full feed depth over a given distance. (a.k.a. Shooting Pocket) {Figure 1}
Thread Relief – In an internal thread it is the area at the end of the thread that is larger than the
major diameter and is used to stop or start the cutting tool. On an external thread this area is
smaller than the minor diameter.
TIG Welding – Tungsten inert-gas welding. Also GTAW (Gas Tungsten-Arc Welding). An arc
welding process in which the heat is produced between a nonconsumable electrode and the work
metal. . The electrode, weld pool, arc, and adjacent areas of the base metal are protected from
atmospheric contamination by a gaseous shield. TIG welding doesn’t necessarily include a filler
metal, however Glycon uses various filler metals with this process often to repair and recondition
damaged parts.
Tip Counterbore – An internal diameter used to align the tip (non-return valve) with the screw.
Tooth Width – With reference to a straight sided spline, gear mixer, or a slotted mixer, it is the
width of a single tooth. {Figure 7}
Trailing Edge – The edge of the flight nearest the feed pocket. {Figure 2}
Transition Section – The section between the feed and meter sections or between the feed
and a DM2™ section. {Figure 1} Any portion of a flow channel that changes depth is called
a transition. With reference to the whirler and CNC belt, the barrier solids channel is called a
transition as it is a continuation of the run from the feed section. Also, a transition doesn’t have
to be from deeper to shallower – a barrier melt channel transitions from shallow to deep and
there are transitions from peaks to valleys in the DM2™ section. {Figure 5}
Undercut (U-Cut) – An area of smaller diameter or the distance between this surface and the
main O.D. of the screw. {Figures 3, 4, & 6}
Undercut (U-Cut) Flight – A flight with an outer surface below the main O.D. of the screw.
{Figures 3 & 4}
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8. Underlay – A layer of softer material used when hardfacing to allow shifting between the harder
outer layer and the base material of the screw. (a.k.a. Butter Layer) {Figure 2}
UniMix – A mixing section with a single flight and a central channel within the main flow
channel where the depths vary.
Valley – Refers to the deepest part of a DM2 section. {Figure 5}
Wax Belt – A belt polishing technique where buffing compound (rouge) is applied to the belt to
fill between the grit particles and used in preparation to buffing for chrome.
Whirled Pocket – The style of pocket developed by the whirling operation. It is about one third
to one half of the main flow channel width and tapers to full depth in 60° to 75° of rotation.
{Figure 1}
Whirler – A CNC machining center using a ring with cutting tools set to the inside to quickly
machine bars such as feedscrews.
Wide Peak – The first peak in a DM2™ section when it follows a barrier. This peak is usually
longer than the others. It is sometimes referred to as a land.
Wiper Flight – The flight in a Maddock mixer that is not undercut from the main O.D.
{Figure 6}
Non-Return Valve Terms
Check Ring – A sliding ring which seats against the rear seat during the injection portion of a
molding cycle to prevent material from flowing back along the flight of the screw. {Figure 8}
Front Seat – A piece for the Check Ring to seat against while the screw is turning and the valve
is open. Found in four piece non-return valves.
Poppet – The sliding piece of a Q.S.O. Valve. {Figure 8}
Q.S.O. – Glycon’s Quick Shut-Off Valve {Figure 8}
Rear Seat – The piece for the Check Ring to seat against during injection and the valve is closed.
It sets against the screw. {Figure 8}
Retainer – The part of a Q.S.O. Valve that holds the Poppet in. {Figure 8}
Tip Pilot – The area between the threads and a shoulder, which fits into a counterbore to align
the tip with the screw. {Figure 8}
Valve Body – The main portion of a three-piece non-return valve, which includes the nose,
flutes, and threads. Or, the housing of a Q.S.O. Valve. {Figure 8}
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