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Knitted polyester fabric is widely used in T-shirts, sportswear, activewear, jerseys, track pants, casualwear and uniforms. But before polyester becomes a finished fabric, the yarn must pass through a knitting process that determines much of the fabric's appearance, stretch, texture and performance. Knitting machines play an important role in converting polyester yarn into a continuous fabric structure. Different machines and knitting techniques can create fabrics with different GSM, stretch, surface texture, drape, breathability and appearance. Understanding how knitting machines work can help garment manufacturers, clothing brands and fabric buyers make better decisions when selecting polyester knitted fabrics. What Is a Knitting Machine? A knitting machine is textile equipment that converts yarn into fabric by forming interconnected loops. Unlike weaving, which creates fabric by crossing yarns in different directions, knitting creates fabric through loops. This loop structure gives knitted fabrics characteristics such as: Flexibility Stretch Soft hand feel Comfortable drape Good movement Different surface textures The final characteristics depend on the yarn, machine type, knitting structure and finishing process. How Is Polyester Knitted Fabric Made? The basic process can be simplified as: Polyester Yarn → Knitting Machine → Fabric Formation → Dyeing → Finishing → Inspection → Finished Fabric Each stage affects the final fabric. 1. Polyester Yarn Selection The process starts with the right polyester yarn. Depending on the required fabric, manufacturers may use: Spun polyester yarn Filament polyester yarn Textured polyester yarn Different yarn counts and specifications Yarn selection influences the eventual: Hand feel Surface appearance Drape Strength Texture Fabric weight The yarn must be suitable for the intended knitting structure and garment application. 2. Yarn Feeding The selected polyester yarn is supplied to the knitting machine through controlled yarn-feeding systems. Consistent yarn feeding is important because uneven feeding can affect the appearance and structure of the finished fabric. During production, manufacturers control factors such as: Yarn tension Feeding consistency Machine speed Stitch formation These settings help maintain uniform fabric construction. 3. Loop Formation The key function of a knitting machine is to create loops from the yarn. Needles and other machine components guide the yarn and form interconnected loops. As the machine continues operating, these loops build into a continuous fabric structure. The size, arrangement and density of the loops influence characteristics such as: Stretch Thickness GSM Surface texture Drape Breathability 4. Different Knitting Structures Different knitting structures can produce very different polyester fabrics. Some common knitted structures include: Single Jersey A widely used structure for T-shirts and lightweight apparel. It can provide: Soft hand feel Comfortable drape Good flexibility Lightweight construction Piqué / Lacosta Commonly used for polo-style garments. It can provide: Textured surface Structured appearance Comfortable wear Different levels of breathability depending on construction Interlock Interlock has a more stable and smooth construction compared with many single-jersey fabrics. It can be used for: T-shirts Activewear Casualwear Premium garments Rib Rib structures are commonly used where additional flexibility is required, particularly for: Collars Cuffs Neckbands Fitted garments Mesh Mesh structures are designed with more open construction to support airflow. They are widely used in: Sportswear Jerseys Activewear Training garments 5. Circular Knitting Machines Circular knitting machines are widely used to produce knitted fabrics in a continuous tubular form. The needles are arranged around a cylinder, allowing the machine to create fabric continuously. Circular knitting machines can be used to produce many types of polyester knitted fabrics. They are particularly common for: T-shirt fabrics Sportswear fabrics Jersey fabrics Polo fabrics Activewear Casualwear Different machine settings and knitting structures can produce different fabric characteristics. 6. Flat Knitting Machines Flat knitting machines produce fabric in a flatter format rather than continuously around a cylinder. They are commonly associated with products requiring shaped or engineered knitted structures. Applications can include: Sweaters Collars Cuffs Knitted panels Shaped components The appropriate machine depends on the product and construction required. 7. How Machine Settings Affect Fabric Knitting machines are not simply used to create fabric. Their settings can significantly influence the final result. Important factors can include: Machine gauge Stitch length Yarn tension Machine speed Needle configuration Fabric take-down Knitting structure Changes in these settings can affect: GSM Width Stretch Surface appearance Fabric density Drape This is why two polyester fabrics made from similar yarns can still have very different characteristics. What Is Machine Gauge? Gauge refers broadly to the fineness or density of the needle arrangement in a knitting machine. Different gauges are suitable for different types of knitted structures and fabric requirements. The machine gauge can influence: Stitch size Fabric fineness Surface appearance Fabric density However, gauge alone does not determine the final GSM or quality of the fabric. What Is Stitch Length? Stitch length refers to the amount of yarn used to form an individual knitted loop. Changing stitch length can affect: Fabric weight Density Stretch Thickness Surface appearance Manufacturers carefully control stitch length to achieve the required fabric specification. How Does Knitting Affect GSM? Knitting construction has a major influence on fabric GSM. GSM can change depending on: Yarn specification Stitch length Fabric density Knitting structure Machine settings Finishing Therefore, GSM should be measured on the finished fabric rather than estimated only from the yarn. How Does Knitting Affect Stretch? Knitted fabrics naturally have flexibility because of their loop structure. However, the amount of stretch varies according to: Knitting structure Yarn characteristics Stitch length Fabric density Elastane content, if used For example, an open mesh structure may behave differently from a dense interlock fabric. How Does Knitting Affect Breathability? The structure of the knitted fabric influences airflow. Open structures such as certain mesh constructions can allow more air movement, while denser structures can provide greater coverage. For sportswear, buyers should evaluate the actual fabric for: Airflow Moisture management Comfort GSM Surface structure From Knitted Fabric to Finished Garment After knitting, the fabric may go through additional processing before it becomes suitable for garment production. A simplified process is: Polyester Yarn↓Knitting Machine↓Grey Fabric↓Dyeing↓Finishing↓Quality Inspection↓Fabric Roll↓Cutting & Stitching↓Finished Garment Each stage can affect the final fabric. Why Does Finishing Matter? Knitting creates the basic fabric structure, but finishing can modify its final characteristics. Finishing can influence: Softness Smoothness Hand feel Drape Surface appearance Dimensional stability This is why the same polyester yarn and similar knitting structure can produce fabrics with different final feels. Quality Checks for Knitted Polyester Fabric After production and finishing, fabric should be inspected before being used for bulk garment production. Important checks can include: GSM Confirm the actual fabric weight. DIA Check the usable width of knitted fabric. Colour Check shade consistency and colour fastness. Surface Look for defects, unevenness or unwanted marks. Stretch and Recovery Important for sportswear and fitted garments. Width Consistency Check whether the fabric maintains the required width throughout the roll. Hand Feel Evaluate softness, smoothness and overall fabric character. Washing Performance Where required, test dimensional stability, colour and appearance after washing. Why Two Knitted Polyester Fabrics Can Feel Different It is common to find two polyester knitted fabrics that look similar but feel completely different. This can happen because of differences in: Yarn + Machine + Knitting Structure + GSM + Finishing For example: One fabric may be: Lightweight Soft Fluid Highly breathable Another may be: Heavier More structured Denser More stable Both can still be polyester knitted fabrics. Choosing the Right Knitted Fabric for Different Garments Garment Important Characteristics T-Shirts Softness, comfort, drape, breathability Sports Jerseys Lightweight construction, airflow, moisture management Polo Shirts Structure, comfort, surface texture Track Pants Stretch, recovery, drape, durability Activewear Stretch, recovery, breathability Casualwear Comfort, hand feel, appearance Uniforms Durability, comfort, colour consistency The ideal knitting structure depends on the specific garment requirements. What Should Fabric Buyers Ask Suppliers? Before purchasing knitted polyester fabric, ask for the complete specification. Important details include: Fibre composition Yarn type Yarn specification Knitting structure GSM DIA Colour Finish Stretch Recovery Intended application It is also useful to request a physical fabric sample before placing a large bulk order. Frequently Asked Questions What does a knitting machine do? A knitting machine converts yarn into fabric by forming interconnected loops. Which knitting machine is used for polyester fabric? Circular knitting machines are widely used for polyester knitted fabrics, while flat knitting machines are used for specific knitted products and shaped components. What is circular knitting? Circular knitting creates fabric continuously using needles arranged around a cylinder. What is single jersey? Single jersey is a common knitted structure used for T-shirts and lightweight garments. Does knitting affect GSM? Yes. Yarn specification, stitch length, machine settings, density and knitting structure can all affect the final GSM. Does knitting affect fabric stretch? Yes. The loop structure of knitted fabric provides flexibility, while the amount of stretch depends on construction, yarn and other factors. What is machine gauge? Machine gauge generally describes the fineness or density of the needle arrangement in a knitting machine. Why do two polyester knitted fabrics feel different? Differences in yarn, knitting structure, machine settings, GSM and finishing can produce very different fabric characteristics. Final Thoughts Knitting machines play a critical role in converting polyester yarn into usable knitted fabric. The basic process is: Yarn → Yarn Feeding → Loop Formation → Knitting Structure → Dyeing → Finishing → Inspection Different knitting machines and settings can create fabrics with different GSM, stretch, texture, breathability, drape and hand feel. For garment manufacturers and fabric buyers, understanding the knitting process makes it easier to evaluate fabric specifications and choose the right material for the intended garment. The final quality of knitted polyester fabric depends on the complete combination of: Yarn + Machine + Knitting Structure + GSM + Finishing Rather than selecting fabric based only on its name or fibre composition, evaluate the actual fabric sample and its performance before moving into bulk production.

Polyester is one of the most widely used fibres in the textile and apparel industry. It is used to produce T-shirts, sportswear, activewear, uniforms, workwear, jerseys, track pants and many other garments. But how does polyester go from a raw material to the finished fabric used by garment manufacturers? The process involves several important stages, including polymer production, fibre or filament formation, yarn manufacturing, knitting or weaving, dyeing, finishing and quality inspection. Understanding how polyester fabric is made can help fabric buyers and clothing brands better understand fabric specifications such as yarn type, GSM, DIA, construction, colour and finishing. What Is Polyester? Polyester is a synthetic fibre commonly used in textile manufacturing. It can be produced in different forms, including: Staple fibre Filament Textured yarn Spun yarn These different forms can be used to create fabrics with different hand feels, textures, drape, strength and performance characteristics. Polyester Fabric Manufacturing Process A simplified polyester fabric manufacturing process looks like this: Raw Materials → Polymer → Fibre/Filament → Yarn → Knitting/Weaving → Dyeing → Finishing → Inspection → Finished Fabric Each stage contributes to the final characteristics of the fabric. 1. Raw Materials The polyester manufacturing process begins with chemical raw materials used to produce polyester polymer. These materials are processed under controlled conditions to create the polymer required for polyester fibre production. For recycled polyester, the raw material can instead include recovered polyester or PET-based material, depending on the recycling process. 2. Polyester Polymer Production The raw materials undergo chemical processing to produce polyester polymer. The resulting polymer is prepared for conversion into fibres or filaments. At this stage, the material is not yet a fabric. It must go through several additional manufacturing processes before it becomes a usable textile. 3. Fibre and Filament Formation The polyester polymer is heated and processed into very fine strands. Depending on the intended product, polyester can be produced as: Filament Continuous strands that can be used directly as filament yarn or processed further. Staple Fibre Short fibres that can later be spun into yarn. The fibre or filament characteristics have an important influence on the eventual yarn and fabric. 4. Yarn Manufacturing The next stage is converting polyester fibre or filament into usable yarn. Different yarn types can be produced depending on the required fabric. Spun Polyester Yarn Made by spinning short polyester staple fibres together. Filament Polyester Yarn Made using continuous polyester filaments. Textured Polyester Yarn Filament yarn that has been processed to introduce additional bulk, texture or other desired characteristics. The yarn specification can influence: Fabric hand feel Surface appearance Drape Strength Fabric construction End use 5. Knitting or Weaving Once the yarn is ready, it is converted into fabric. There are two major fabric-making methods: Knitting Knitting uses loops of yarn to create fabric. Knitted polyester fabrics are widely used for: T-shirts Sportswear Activewear Jerseys Track pants Casualwear Different knitting structures can create different levels of stretch, texture, drape and breathability. Weaving Weaving interlaces yarns in different directions to create a woven fabric. Woven polyester fabrics can be used for: Jackets Uniforms Workwear Outerwear Technical textiles Other structured garments The choice between knitting and weaving depends on the required fabric characteristics. 6. Fabric Construction Fabric construction is an important part of the manufacturing process. Even when two fabrics use polyester yarn, their final appearance and performance can be very different because of differences in construction. Construction can influence: GSM Surface texture Stretch Recovery Breathability Drape Coverage Durability This is why fabric buyers should consider more than fibre composition alone. 7. Dyeing After fabric formation, the material can be dyed to achieve the required colour. The dyeing process must be controlled carefully to achieve: Consistent colour Even dye penetration Required shade Colour fastness Batch consistency Colour consistency is particularly important for bulk garment production. A buyer may request a specific colour based on a shade standard or approved sample. 8. Fabric Finishing After dyeing, polyester fabric may undergo different finishing processes. Finishing can modify characteristics such as: Hand feel Softness Surface appearance Drape Smoothness Performance Depending on the intended application, different finishes may be used. The finishing stage can significantly influence how the final fabric feels and looks. 9. Fabric Drying and Heat Setting Depending on the fabric and manufacturing process, controlled drying and heat-setting processes may be used. These processes can help control fabric dimensions and contribute to fabric stability. For knitted fabrics, dimensional stability is particularly important because the fabric must maintain its intended width and shape. 10. Fabric Inspection Before the fabric is supplied to a customer, it should be inspected for quality and consistency. Common checks can include: GSM DIA Colour Surface appearance Fabric defects Width consistency Shade variation Construction Hand feel Additional testing may be required depending on the intended application. What Is GSM in Polyester Fabric? GSM means Grams per Square Metre. It indicates the weight of the finished fabric per square metre. For example: 120 GSM — lightweight fabric 160 GSM — medium-light fabric 180 GSM — medium-weight fabric 220 GSM — heavier fabric These are general examples, and the appropriate GSM depends on the garment and fabric construction. GSM should not be considered alone because yarn and construction also affect fabric performance. What Is DIA in Polyester Fabric? DIA refers to the diameter or usable width of knitted fabric. It is an important specification for garment manufacturers because fabric width affects: Marker planning Fabric consumption Cutting efficiency Garment production When ordering knitted polyester fabric, buyers commonly consider both GSM and DIA. How Yarn Affects Polyester Fabric Yarn is one of the fundamental components of fabric. Different yarn types can produce different fabric characteristics. Spun Yarn Can provide a softer, more textile-like surface. Filament Yarn Can provide a smoother and more consistent appearance. Textured Yarn Can provide additional bulk, texture or softness depending on the construction. Therefore: Fibre → Yarn → Fabric Construction → Finished Fabric Each stage influences the final textile. How Finishing Changes Polyester Fabric Two polyester fabrics can start with similar yarns but feel very different after finishing. Finishing can influence: Softness Smoothness Surface appearance Drape Hand feel Structure This is one reason why fabric buyers should evaluate actual samples before placing bulk orders. Quality Checks Before Buying Polyester Fabric Garment manufacturers and wholesale buyers should check the finished fabric rather than relying only on the product name. Important specifications include: 1. Fibre Composition Confirm the actual fibre composition. 2. GSM Check fabric weight. 3. DIA Confirm fabric width. 4. Yarn Understand whether the fabric uses spun, filament or textured yarn. 5. Construction Check the knitting or weaving structure. 6. Hand Feel Evaluate softness, smoothness and surface character. 7. Drape Check how naturally the fabric falls and moves. 8. Colour Check shade consistency. 9. Durability Evaluate the fabric according to its intended use. 10. Washing Performance Test shrinkage, colour and appearance after washing where necessary. Why Two Polyester Fabrics Can Feel Different It is common for buyers to see two fabrics labelled simply as "polyester" but notice significant differences. This happens because polyester is only the fibre category. The final fabric depends on: Fibre + Yarn + Construction + GSM + Finishing For example, one polyester fabric may be: Soft Lightweight Smooth Fluid While another polyester fabric may be: Structured Textured Heavier More durable Both can still be polyester. Polyester Fabric for Different Garments Garment Important Fabric Characteristics T-Shirts Comfort, softness, breathability, drape Sportswear Lightweight construction, moisture management, quick drying Jerseys Breathability, printing, comfort, durability Track Pants Stretch, recovery, drape, durability Uniforms Durability, comfort, colour consistency Workwear Strength, durability, easy care Travelwear Lightweight construction, quick drying, easy care Jackets Structure, durability, weight and drape The ideal fabric specification depends on the final garment requirements. From Yarn to Finished Garment The textile manufacturing journey does not stop when the fabric is finished. The overall process can be understood as: Raw Material↓Polyester Polymer↓Fibre / Filament↓Yarn↓Knitting / Weaving↓Dyeing↓Finishing↓Quality Inspection↓Fabric Roll↓Cutting↓Garment Manufacturing Each stage can influence the final quality and performance of the garment. Frequently Asked Questions How is polyester fabric made? Polyester fabric is produced by converting polyester raw materials into polymer, forming fibres or filaments, producing yarn, knitting or weaving the yarn into fabric, and then dyeing and finishing the fabric. What is the first step in polyester fabric production? The process begins with raw materials that are processed to produce polyester polymer. How does polyester become yarn? Polyester polymer is converted into fibres or continuous filaments, which are then processed into different yarn types such as spun, filament or textured yarn. Is polyester fabric knitted or woven? It can be either knitted or woven. Knitted polyester is common in T-shirts and sportswear, while woven polyester is widely used for structured garments and technical applications. What does GSM mean in polyester fabric? GSM means Grams per Square Metre and indicates the weight of the finished fabric per square metre. What does DIA mean in knitted polyester fabric? DIA refers to the diameter or usable width of knitted fabric and is important for garment cutting and fabric consumption. Does finishing change polyester fabric? Yes. Finishing can change characteristics such as softness, hand feel, surface appearance, smoothness and drape. Why do two polyester fabrics feel different? Different yarn types, fabric constructions, GSM, finishing and manufacturing processes can make two polyester fabrics feel and perform differently. Final Thoughts Making polyester fabric is a multi-stage process that transforms raw materials into a finished textile. The basic journey is: Raw Material → Polymer → Fibre → Yarn → Fabric → Dyeing → Finishing → Inspection Every stage contributes to the final characteristics of the fabric. For garment manufacturers and fabric buyers, understanding this process makes it easier to evaluate specifications such as yarn type, GSM, DIA, construction, colour, hand feel and finishing. Ultimately, good polyester fabric selection is not simply about choosing polyester. It is about understanding how the yarn, construction and finishing work together to create the performance required for the finished garment.