Twin screw and barrel are the heart of extruders and play very crucial role in extruder.

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Beverley Johnson
6 years ago
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SHREE RADHEKRISHNA EXTRUSIONS PVT.LTD, a renewed engineering company has been Serving in the field of manufacturing screw & barrel for last more then 20 years.

2 SHREE RADHEKRISHNA EXTRUSIONS PVT.LTD, a renewed engineering company has been Serving in the field of manufacturing screw & barrel for last more then 20 years. Radhekrishna Extrusions manufactures screw & barrel from 20mm diameter to 150mm diameter OD and up to 4000mm length. Twin screw and barrel are the heart of extruders and play very crucial role in extruder. Radhekrishna Extrusions screws and barrels are manufactured under very precise stage wise inspection and quality check system. The company has all advance in house facilities to manufacturer the screw and barrels. The cast experience, technical know how and entrepreneur skill have made the company renewed in manufacturing screw and barrel in the field. Radhekrishna Extrusions following & believe in STAGE BY STAGE INSPECTION & doing by having very educated Quality Control Department & staff. Also having technically knowledgeable labors. Our policy no.1 is to provide best service to our all customers.

3 CONICAL TWIN SCREW AND BARREL : Radhekrishna Extrusions manufactures twin screw and barrels starting form 35mm to 110mm. Radhekrishna Extrusions manufactures screws and barrels according to present market needs like higher filler, low filler, application and ISI grade. We Radhekrishna Extrusions follow all standard manufacturing process and adhere all standard norms of manufacturing. We are manufacturing screw & barrel as per CMT, KMD Design.

4 PARALLEL TWIN SCREW AND BARREL : Radhekrishna Extrusions manufactures twin screw & barrels starting from 20mm to 150mm screw diameter. We are also manufacturing screw & barrel As per Kolsite, Windsor, TTS (Thayson) design.

5 SINGLE SCREW & BARREL Radhekrishna Extrusions manufactures single screws and barrels starting from 20mm to 150mm screw diameter. GROOVED FEED BARREL : The grooved feed is used for achieving high shear and better transportation of material. As co-efficient of friction between granules and screw and barrel should higher to get Proper melting of the material, it s imperative to have grooved feed in the barrel for Processing of polymers of olefin group. Application : o LDPE / HDPE / PP Film o Raffia / Mono Filament Application

This unique mixing feature thoroughly homogenizes the Melt with little or no increase in its

6 BARRIER SCREW The barrier screw design separates melted material from un- melted solid material Into separate channels. This unique mixing feature thoroughly homogenizes the Melt with little or no increase in its average temperature. Mixing is achieved with an Undulating root profile in the metering zone of the screw. Applications: o LDPE / HDPE / PP Film o ABS o PVC Cable o PVC Pipe & PVC Profile

7 MADDOC - BARRIER SCREW Medoc barrier screw is used to break down particles by forcing material to flow over barrier flights, in a similar manner to barrier screws. Application : o HDPE Pipes o XLPE Cables o Lay Flat Pipe o LDPE Tubing o PP Film Maddoc Maddoc & Barrier Both in One Screw

8 SHREE RADHEKRISHNA EXTRUSIONS PVT.LTD MANUFACTURING SCREW & BARREL FOR : PIPE PLANT o PVC Pipe Manufacturer (U PVC, R PVC, S PVC, CPVC) o HDPE Pipe Manufacturer o PVC Braided Pipe Plant o PVC Suction Hose Pipe o PVC Soft Tubing Pipe SHEET PLANT o Air Bubble Sheet Plant o PP Sheet Plant o HIPS Sheet plant o PVC Sheet Plant o Thermo Forming Sheet Plant FILM PLANT o PVC Film Plant o Lamination Film Plant o Blown Film Plant o Tape Plant o Multi Layer Film Plant CABLE MANUFACTURER (ANY TYPE OF MATERIALS) COMPOUNDING PLANT INJECTION MOULDING MACHINERY BLOW MOULDING MACHINERY ANY TYPE OF PLASTIC PALLET MANUFACTURING

9 NEW TECHNOLOGY Founded By After Many years of experience & research & development, we have found new technology, which we have described below : 1.Screw Pair - First Zone Will Be Tungsten Carbide Coated : We think you are also aware that the First Zone(Melting Zone) takes higher or more load in the comparison of other zone, so that's why we are coating of Tungsten Carbide on surface of same zone so it will give you better life against higher filler loading & other particles. 2. Front Barrel will be HSS Sleeve Fitted : For Same reason, we provide sleeve on front barrel ( which will be fitted on Melting Zone), Which made from "High Speed Steel", it also give better life against wear & tear.

Glimpse of Process for Screw & Barrel Screw & Barrel made out of EN -41B (Moscow make steel),nitride steel. The material is T conditioned by thermal process.

10 Glimpse of Process for Screw & Barrel Screw & Barrel made out of EN -41B (Moscow make steel),nitride steel. The material is T conditioned by thermal process. Screw profile is done on thread milling machine. Honing of barrel is done to achieve superior internal bore surface finish. Screw is highly polished by special purpose polishing machine. Stabilizing is done to remove all stresses developed. Screw & Barrel is nitride harden,skin hardness maintain 68 to 70 HRC. Nitrided layer thickness maintained up to 0.47 to 0.50 Screw will be straight with in 0.07 m. m. on turn over by hydraulic press. Close clearance and exacting machining tolerance for screw and barrel. All the procedures are done under Strict Quality Control

Procedure of Screw Raw Material (We are using EN-41B

11 Procedure of Screw Raw Material (We are using EN-41B (Moscow-Steel) Material.) Chemical Analysis (We are using EN-41B Material but it is Original composition or not, to check we do a test for it.) Gun Drill ( It is mainly used to check that Screw is Straight or not. Secondly it is also used for water cooling & drilling in barrel.)

Procedure of Screw Toughening (When we use Raw

machining for zone wise flight cutting) Spline

12 Procedure of Screw Toughening (When we use Raw material it has uneven hardness so to maintain its hardness this process is used.) Blank Operation (It is used for Pre Stage machining for zone wise flight cutting) Spline Cutting (As per Gear Box Spline Screw is used to Spline for Windsor and Kolsite Design.)

Procedure of Screw Flight Cutting (There

13 Procedure of Screw Flight Cutting (There are two options for Flight cutting) 1. We can cut it on CNC Machine 2. We can manually cut it on Thread Milling Machine. Thread Milling Machine CNC Machine Inspection By us (We check that everything is O.K or not.)

Procedure of Screw Stabilizing Operation (If

14 Procedure of Screw Stabilizing Operation (If there are Un-Even Stress or Scratches on Screw, these process is used to remove that.) Polishing (This process is used to polish the Outer Diameter which we keep.) Grinding It is used to maintain Final Size and for Finishing.

) Gas Nitriding (It is used to maintain hardness of Screw.

15 Procedure of Screw Inspection (We check that every thing is done in proper way or not until previous process.) Gas Nitriding (It is used to maintain hardness of Screw.) Straightening (When the screw comes from Nitriding it is not straight as before so this process is used to Straighten the screw)

5 Deep) Metal Hardness Tester Final Grinding It is used to maintain final Size

16 Procedure of Screw Inspection (In this inspection it is checked that Screw has maintained the hardness of 65 to 68 HRC or not and 0.4 to 0.5 Deep) Metal Hardness Tester Final Grinding It is used to maintain final Size & Finishing. Buffing & Polishing It is used to completely polish the screw and give a new look to it.

Procedure of Barrel Cutting : First of all we

17 Procedure of Barrel Cutting : First of all we are cutting the bars & make the Proper length of barrel. Rough Bore (This Process is used to make bore on Deep Gun drill Machine.) Tuffning - (When we use Raw material it has uneven hardness so to maintain its hardness this process is used.)

18 Procedure of Barrel Final Bore (In this Process we can get Final Size of Bore.) Thread Cutting It is used to cut Flanges. Primary Inspection.(With the help of Bore Gauge & Micrometer we are measure the Bore of Barrel & Outer Diameter.)

Procedure of Barrel Honing (This Process is used to achieve complete Mirror Finishing, If we put our fingers on barrels than our fingers also Slide.

19 Procedure of Barrel Honing (This Process is used to achieve complete Mirror Finishing, If we put our fingers on barrels than our fingers also Slide.) Secondary Inspection - With this process we are Inspecting bore & Center Distance of barrel that Every thing is ok or not) Hopper Mounting Cutting & Vent Cutting (This process is used for material feeding and Vent Cutting)

) Drilling Operation (This process is used to pierce hole in Thermocouple.

20 Procedure of Barrel Dowelling (This process is used to match Gear-Box Side Flange with, Barrel s Flange and if it is Twin Barrel than it is necessary to match Front & Rear Barrel.) Drilling Operation (This process is used to pierce hole in Thermocouple.) Nitriding (It is used to maintain hardness of Barrel.) We have our own Nitriding furnace at our work place.

21 Procedure of Barrel Third Inspection Polishing (This process is used for polishing barrel to get proper finishing.) Matching (In this process it is checked that screw is running properly, in Barrel or not {Free Rotation}.) Final Inspection (After finishing all operations final inspection is done.)

22 POINTS WILL EMBOLDEN YOU TO WORK WITH POINT: 1 WE ARE PURCHASING EN-41-B FROM M/S GIRDHARILAL AGRAWAL: Actually M/S GIRDHARILAL AGRAWAL is ISO certified dealers of Musco Company in all over India for the EN-41-B material, RADHEKRISHNA, KOLSITE & WINDSOR are using their material from them, so here in local market EN-41-B is available for 60 Rs/kg only but where we are purchasing it for 120 Rs/kg, now see the difference between ours & others. POINT: 2 WITHOUT DOING MATERIAL TEST, WE ARE NOT STARTING THE WORK: Which material we are purchasing, it having the 90% of Mild Steel & 10% of heard metals like aluminum, silicon, nickel, phosphorous, carbon, chromium & which material other manufacturer purchasing from local vendor it having 95 to 98% of Mild steel & 2 5 % of heard metal, so in the comparison of other manufacturers,our material is very higher grade, however we are doing test on it in ISO laboratories, after getting the positive report we are starting the work on it, either we are not starting the work.

23 POINT: 3 BENIFIT OF OUR IN HOUSE CNC MACHINES & NITRIDING FURNACE: We are having all CNC machines which having of WINDSOR & KOLSITE, so we are same in machineries, moreover we have our own nitriding furnace, it is so benefit of us, normally others do nitriding process total cycle time 96 hrs 8hrs purging time (with ammonia gas passed through the furnace & inside atmosphere with totally ammonia gas & temperature achieve 530ᵒc) + soaking time 72 hrs. (With 530ᵒc & ammonia gas pressure maintain) + 16 hrs. Cooling time up to 150ᵒc, but we are maintaining soaking time 80 hrs. Instead of 72hrs to get better nitriding hardness & case depth. We are maintaining 0.5mm in-depth layer of 64 to 68 HRC in Screw & Barrel. Point: 4 WE ARE PROVIDING TUNGSTEN CARBIDE COATED SCREW PAIR We would like to inform you & we think you also aware of that the First Zone(Melting Zone) takes higher or more load in the comparison of other zone, so that's why we do coating on surface of same zone so it will give you better life against higher filler loading & other particles. Point: 5 WE ARE PROVIDING HSS SLEEVE FITTED BARREL For Same reason, we provide sleeve on front barrel (which will be fitted on Melting Zone) which made from "High Speed Steel", it also give better life against wear & tear.

Recommended Dimensional Guidelines for Single Screws

The Society of the Plastics Industry s Machinery Component Manufacturers Division Recommended Dimensional Guidelines for Single Screws The following recommendations for single screws of injection molding