PP Multifilament Yarn

Multifilament yarns are composed of a bundle of very thin, infinitely long threads. The threads are generally referred to as filaments. These yarns are generally spun on vertical machines with filaments extruded out of the spinnerets and air-cooled before getting wound onto spools.In multi filament yarn production,

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each spinneret contains a plurality of holes (usually 30–100) and each hole of the spinneret creates a filament. Hence, multi filament yarns are a collection of extremely fine mono filaments (filament diameter, 10–50 μm). The Multi filament yarns are much more flexible than mono filaments at equivalent linear density and also higher covering power.

Multifilament yarns contain a multitude of fine, continuous filaments (often 5 to 100 individual filaments) usually with some twist in the yarn to facilitate handling. Sizes range from 5–10 denier up to a few hundred denier. Individual filaments in a multifilament yarn are usually about 1–5 denier.
read more PP multi filament yarns ( twisted & Non twisted) with 700 to 4000 deniers has 5.5 to 6.5 GPD ( grams per denier) having good tenacity , high impact stress, water resistant , intermingled & recyclable.

PP yarns are classified into 2 types :

1) BCF stands for “bulked continuous filament” and refers to a one step process where one or multiple filament yarns are tangled by airstream. The end use for BCF yarns is usually carpets as BCF yarns are very bulky. 

2) CF stands for “continuous filament” in which spin finishes yields high- and medium-tenacity yarns which contributes to stable production processes.

Why Bajaj ?

Our Masterbatches for these applications are manufactured with state of the art technology and full fledged RnD lab with Quality control & Assurance to ensure offering our customers best in class , consistent quality with wide range of Color palette besides white & black with well tested colour fastness, gloss with aesthetics & weather ability characteristics.
As the global demand for mono and multi filament yarns keep growing in sectors such as Agriculture, Fishing ,Technical Textiles, Automotive, Waste water treatment, etc , WE at BAJAJ strive hard with our Team to carry on futuristic innovative efforts with confidence in developing our customized masterbatches to cater any customer across the globe in this sector

Unique features

Our masterbatches are suitable for extrusion of all kinds of low or medium density PE filaments with good runnability & pack life.
Colour masterbatches yields high-intensity color with great dispersion due lowest filter pressure value , No migration , withstands high temperatures , free from contamination , no agglomerates , etc.
Enables the processors with ease to choose the right masterbatch from our product basket as low LDR % results in cost optimization.
Additives like UV-blockers makes the filament yarns more resistant to water, chemicals, insects and mildew, sunlight and abrasion. Hence it is compatible with all kinds of outdoor applications.

Trouble shooting guide - PP Multifilament yarns

PROBLEMPOSSIBLE CAUSESSOLUTIONS
Filament breakages due to degradationMoisture in the material.Use hopper dryer.
Polymer dust/ powder in the material.Use dust free material, eliminate sharp corners in conveying system particularly at hopper valves which generate polymer dust due to abrasion of granules at these sharp corners
High level of low molecular weight component in the material.Use narrow molecular weight distribution material, reduce extrusion temperature.
Pigments / masterbatches degrading at spinning temperature Use high temperature stability pigments / masterbatches.
Higher melt residence time in the extruder / manifoldAdjust melt residence time to optimum level.
Extrusion temperature too highOptimise extrusion temperature profile
Uneven temperature distribution in manifold and spin packCheck heating system, temperature controllers & thermocouples for its working.
Filament breakage at spinneretMelt viscosity is too high or too low.Adjust melt viscosity by optimising extrusion temperature.
Addition of some types of pigments drastically reduce melt viscosity.Use high pressure & temperature stability pigments, reduce extrusion temperature.
Uneven melt flow or formation of channel due to damaged filter pack of spinning head.Replace damaged filter pack, reduce the pressure between extruder & filter pack
Uneven melt flow due to malfunctioning of metering pump.Check metering pump drive system, replace worn out parts of metering pump.
Bits of decomposed material clog spinneret holes.Clean & replace spinneret, check for pigment degradation, reduce spin pack temperature.
Filament breakage at quenching zoneMelt draw down too high creating very high filament tension in spin-line zone.Reduce take-up velocity.
Quench air velocity too high, filaments sticking to each other.Reduce quench air velocity, temperature respectively.
Filamentation at spin finish applicator, worn out thread guidesCheck thread guides for damage / serration, repair / replace spin finish applicator.
Filament breakage at winding zoneJerks, vibrations & erratic drive of godets and winderCheck godet and winder drive for jerks and vibration, repair the same.
Worn out thread guides resulting into filamentation.Replace worn out thread guides.
Non-uniformity of spun filamentsDegradation of material.Use polymer free of moisture & dust. Use hopper dryers & feeders, reduce extrusion temperature, use narrow molecular weight distribution polymers
Non-uniform dispersion of pigments, degradation of pigments.Use high temperature grade pigments, particle size of pigment could be less than 5μm size.
Through-put variation.Check metering pump drive system & replace worn out metering pump parts.
Damaged or choked filter pack causing uneven melt flow.Replace damaged filter pack with new pack.
Temperature variation between various spinning heads resulting into variation in melt viscosity. Check temperature controller and thermo couples, maintain temperature variation between all spinning head within +/- 1degC.
Partial blocking of spinneret holes causing uneven melt flow.Clean the spinnerets holes or replace spinning block with new pack.
Variation in quench air velocity.Check & adjust air blower speed, clean air filters & nets.
Variation in take-up / winding speed.Check AC inverters of godets and winders for their performance.

Applications of PP Multifilament yarns

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