Roving presentation

TOPIC:-

PRESENTED BY:-Study on Roving Frame.

Luqman Tariq (15-NTU-0062)Hafiz Abdul Basit (15-NTU-0042)Hafiz Syed Ahmad (15-NTU-0046)Ghazanfar Ali (15-NTU-0039)

Introduction of Roving Frame:- The roving frame is an intermediate machine

between draw frame and ring frame in which fibers are converted into low twist lea called roving.

Input of roving frame is sliver and its output called roving.

The roving frame is called by various names in industry as simplex, speed frame, fly frame.

Necessity of Roving Frame:-

Two principal reasons for the use of roving frame are:-

The required high draft in the ring frame (DT = 300 – 500).

Draw frame cans are not convenient for transport and presentation of feed material to the ring frame.

Objectives of Roving Frame:-

Draft the sliver to reduce its weight per unit length. Insert small amount of twist to give required strength of

roving.  Wind the twisted roving on to the bobbin.

Operations Involved in Roving Frame:-Creeling.Drafting.Twisting.Laying.Winding.Building.Doffing.

Advantages of Roving Frame:-

Occupied less volume w.r.t. weight Handling is easyTransportation is easy Stability increases

Parts of Roving Frame &

its Function.

Creel:- Creel is used to guide the sliver. Creel portion is present

above the can. Creel help the sliver on their way to the drafting

arrangements without any disturbance

Guide Roller:-Guide roller are used to guide the sliver.

Sliver Guide:- Its also used to guide the sliver.

Condenser:- Condenser are used to condensing/pressing the sliver. The purpose of condenser is to bring the fiber strand back

together again.

Pressure Arm:-Pressure arm is use to give pressure onto the material.

Back Pair of Drafting Roller:-The drafting start from these roller.The back roller are negatively driven.The bottom pair roller the positively driven.The diameter of back roller are 28mm.

Middle pair of Drafting Roller:-The main drafting occur in this region.The speed is greater than back pair of roller.The diameter of these roller are 28mm.

Front pair of Drafting Roller:-The further drafting occur in this region.The speed of these pair of roller is greater than the

middle pair of roller.The diameter of these rollers are 28mm.

Cradle:- Cradle are used to give proper tension to the

upper and bottom rollers. For proper guidance of material.

Spacer:- The main function of distance clip are to maintain

sufficient distance between top and bottom aprons to attenuate the strand properly.

Aprons:- The aprons co-operate each other to guide and

transport the fiber during drafting.

Drafting Pressure:- The top roller must be pressed with relatively high force

against the lower roller to ensure guidance of the fiber. Pressure in the range 100N to250N-300N per roller and they

are dependent upon raw material and volume.

Rubber Cord:- Cord are made of synthetic rubber and are mounted

on upper rollers.

Flyer:- The flyer insert twist; each flyer rotation create one turn in

the roving. Twist per unit length of roving depend upon the delivery rate.

Presser Arm:- The arm has to guide the roving from the exit of the

flyer leg to the package.

Spindle:- The spindle is steel rod of circular cross section with its dia

reduce at the top. The slot in which the flyer pin is mounted. The diameter of spindle also reduce at the bottom and takes

shape of tapered cone. Angle of tapered is 80-90 degree.

Roving Bobbins:-

Principleof

Roving

Drafting Principle:-Drafting zone must be inclined.Inclined zone prevent Breakage of fibers.Fiber become straightened ,Compact and arranged here.

Twisting Principle:-One end of material is gripped and other end rotated.Twist measure in TPI.

TPI=

Winding Principle:- Flyer Lead winding system. Bobbin lead winging system.

Flyer lead winding system:- Speed of flyer is high than Bobbin speed. Use for long staple fiber.

Bobbin lead winding system:-Bobbin speed is higher than.Used for short fiber.

Surface speed= πDN

RPM of bobbin reduced after every layer Surface speed of bobbin remain constant

Comparisonof different

Roving Machines

Manufacturer:- Rieter - Switzerland (F 15, F 35 etc). Toyota - Japan (FL-16, FL-100). Lakhshmi Machinery Works India. China Textile Machinery Works. Marzoli - Itali etc.

Features of (FL-15, FL-35):- Upto 160 spindles. Available for 6” or 7” bobbins. Touch screen operator panel with 10” display. Individual drivers for flyer and spindle.

Toyota:- (Comparison)FL-16

Model of 1985.No. of spindle are 120.Cradle radius

31.5*40mm.Size of feeding can

20”*52”.Fiber type cotton,

synthetic, blended.Total draft 332 mm.

FL-100

Model of 1996.No. of spindle are 144.Cradle radius

34.5*40mm.Size of feeding can

20”*45”.Fiber type combed or

carded.Total draft 348 mm.

Lakhshmi:- (LF-4200)

Spindle upto 200.Spindle speed upto 1500 rpm.Auto doffer with provision for bobbin

transport system.Automatic roving tension controller.Drafting system 4 over 4 over 3 over 3.

Lakhshmi:- (LF-1400)Flyer speed upto 1400 rpm.Top and bottom clearer driver with suction.Number of spindle upto 144.Flexibility in drafting system.Delivery rate 40m/min.

Lakhshmi:- (LF-1660)Suspended flyer.Servo bobbin build.Higher delivery rate.Delivery rate 50 m/min.

Recently development in Roving Machine:-Higher Flyer Speed.Roving stop motion.Electronic driven system.Blow apparatus.CCD sensor.

ANY