Knitting Production Calculations Quiz
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Questions and Answers

What is the average circumferential speed for modern high-speed fabric machines?

  • 1.7 m/sec
  • 1.6 m/sec (correct)
  • 1.5 m/sec (correct)
  • 2.0 m/sec

    • Which of the following best describes how machine speed can be expressed?

  • All the above are correct
  • As speed of fabric production or number of feeds (correct)
  • Only in terms of revolutions per minute
  • Using only the machine diameter

    • How is the number of feeds expressed in the context of circular knitting machines?

  • As the total for diameter or per inch of diameter (correct)
  • Only as the number of feeds per inch of diameter
  • As a percentage of machine speed
  • Only as a total for the cylinder diameter

    • Which factor is NOT primarily associated with production calculations in knitting?

    <p>Machinery upkeep costs</p> Signup and view all the answers

    What does the circumferential speed indicate about a knitting machine?

    <p>The efficiency of fabric production</p> Signup and view all the answers

    What is achieved under laboratory conditions regarding machine speeds?

    <p>Speeds of 2.0 m/sec</p> Signup and view all the answers

    Which of the following correctly relates RPM and machine diameter?

    <p>RPM is specific to machine type and diameter</p> Signup and view all the answers

    Why are correct calculations crucial in the knitting industry?

    <p>They influence the competitive selling price</p> Signup and view all the answers

    What does the circumferential speed of a knitting machine help to calculate?

    <p>The rpm for a particular machine diameter</p> Signup and view all the answers

    Which of the following is a method to measure the productivity of a knitting machine?

    <p>Calculating the weight of fabric produced in one hour</p> Signup and view all the answers

    If a machine operates at a circumferential speed of 2 m/sec, how is it categorized?

    <p>High speed</p> Signup and view all the answers

    Which parameter is NOT typically used to assess knitting machine performance?

    <p>Fabric color composition</p> Signup and view all the answers

    What must be done to convert optimum production into nominal production?

    <p>Multiply it with efficiency</p> Signup and view all the answers

    Which factor is a key determinant of the yarn consumed by the machine in an hour?

    <p>Stitch density</p> Signup and view all the answers

    The term 'weft knitting' primarily refers to which aspect of fabric production?

    <p>The length of the fabric output</p> Signup and view all the answers

    Which of the following parameters does NOT directly affect the circumferential speed of a knitting machine?

    <p>Number of feeders</p> Signup and view all the answers

    How is the production in kilograms per day calculated at 100 percent efficiency for circular knitting machines?

    <p>No.of working feeders x RPM x GSM x Fabric open width in mtr x 13.50</p> Signup and view all the answers

    Which formula represents the production in yards per hour for circular knitting machines?

    <p>No of working feeders x RPM x 60</p> Signup and view all the answers

    What is the formula for calculating the fabric weight per linear yard?

    <p>Number of needles per inch x Stitch length in inches x Courses per inch x 1000</p> Signup and view all the answers

    How is GSM calculated according to the provided methods?

    <p>Stitch density (cmloop sqx Loop length (mm) x Count (Tex)100</p> Signup and view all the answers

    What information does the constant Ks represent in the GSM formula?

    <p>It varies for different fabric structures and types.</p> Signup and view all the answers

    What does Ks represent in fabric calculation?

    <p>A calculation of fabric stretchability</p> Signup and view all the answers

    In the formula for loop length, which variable is used as a constant factor?

    <p>K</p> Signup and view all the answers

    Which fabric type corresponds to a Ks value of 39.3?

    <p>Plain interlock</p> Signup and view all the answers

    What is the formula used to calculate fabric thickness for single jersey (SJ)?

    <p>Yarn diameter x 2</p> Signup and view all the answers

    How is yarn length per stitch calculated?

    <p>Loop length divided by number of stitches in course</p> Signup and view all the answers

    If a fabric has a width of 80 cm and 4 wales per cm, what is the number of needles used?

    <p>320</p> Signup and view all the answers

    What is the formula for calculating stitch density?

    <p>Courses per cm x Wales per cm</p> Signup and view all the answers

    Which of the following directly affects the calculation of fabric length in yards per hour?

    <p>RPM of the machine</p> Signup and view all the answers

    For direct system calculations, how is the yarn diameter represented?

    <p>In Tex</p> Signup and view all the answers

    In the formula for calculating feeder density, what variable is in the numerator?

    <p>Number of feeders</p> Signup and view all the answers

    What is the production in kilograms per day calculated at 100 percent efficiency using Method 1?

    <p>No. of working feeders x RPM x GSM x Fabric open width in mtr x 13.50</p> Signup and view all the answers

    Which of the following formulas calculates fabric weight per linear yard?

    <p>Count Ne x 840 x 2.2</p> Signup and view all the answers

    How can the grams per square meter (GSM) be calculated using Method 2?

    <p>Ks x Count (Tex)</p> Signup and view all the answers

    What aspect does Method 4 assess to calculate fabric weight per square yard?

    <p>Weight per linear yard</p> Signup and view all the answers

    Which component is essential in the formula to calculate GSM?

    <p>Constant Ks specific to fabric</p> Signup and view all the answers

    What is a typical circumferential speed for high-speed fabric machines operating under factory conditions?

    <p>1.6 to 1.7 m/sec</p> Signup and view all the answers

    How is the speed of a circular knitting machine expressed?

    <p>In revolutions per minute (RPM) for a specific machine and diameter</p> Signup and view all the answers

    What is considered high speed for knitting machines?

    <p>2.0 m/sec</p> Signup and view all the answers

    Which calculation is essential for determining the competitive selling price in the knitting industry?

    <p>Correct calculations of production, efficiency, and material requirements</p> Signup and view all the answers

    What parameter primarily indicates the performance capacity of a knitting machine?

    <p>Speed factor (rpm x diameter in inches)</p> Signup and view all the answers

    Which of the following best describes the significance of machine revolutions per minute (RPM)?

    <p>They are only relevant to certain machine types and diameters</p> Signup and view all the answers

    To calculate the total number of feeds for circular knitting machines, how is it expressed?

    <p>As the number of feeds per cylinder diameter in inches</p> Signup and view all the answers

    Under what conditions have speeds of up to 2.0 m/sec been achieved?

    <p>Under laboratory conditions</p> Signup and view all the answers

    What determines the optimum production of a knitting machine?

    <p>Combination of machine efficiency and quantity of yarn consumed</p> Signup and view all the answers

    Which parameter is crucial for calculating the productivity of a knitting machine?

    <p>Circumferential speed</p> Signup and view all the answers

    To convert optimum production into nominal production, what must be done?

    <p>Multiply by the efficiency</p> Signup and view all the answers

    What does kilogram production per unit time specifically refer to in knitted fabric manufacturing?

    <p>Fabric weight produced in a defined timeframe</p> Signup and view all the answers

    Which method is commonly used to assess the fabric output from a knitting machine?

    <p>Calculating the weight of fabric produced in one hour</p> Signup and view all the answers

    How can the quantity of yarn consumed by a machine in one hour be determined?

    <p>By converting the length of yarn into weight using a given count</p> Signup and view all the answers

    Which of the following statements accurately reflects the primary goal of calculating production in the knitting industry?

    <p>To accurately schedule production and specify delivery dates</p> Signup and view all the answers

    What role does the machine speed (rpm) play in fabric production?

    <p>It directly influences both fabric output and efficiency</p> Signup and view all the answers

    What is the correct formula to calculate the yarn diameter for the Direct System?

    <p>$d = \frac{1}{28\sqrt{Ne}}$</p> Signup and view all the answers

    How is fabric thickness calculated for delicate fabrics like single jersey (SJ)?

    <p>2 times the yarn diameter</p> Signup and view all the answers

    What is the value of Ks for the 1 x 1 rib fabric type?

    <p>24.5</p> Signup and view all the answers

    Which variable is needed to calculate loop length in fabric production?

    <p>Yarn length per stitch</p> Signup and view all the answers

    For calculating stitch density, which two measurements are multiplied together?

    <p>Courses per cm and Wales per cm</p> Signup and view all the answers

    What is the relationship between fabric width and the number of stitches in a course?

    <p>Fabric width is calculated by dividing the number of stitches in course by Wales per cm</p> Signup and view all the answers

    Which fabric type has the highest value of Ks as indicated?

    <p>Plain interlock</p> Signup and view all the answers

    In the formula relating fabric length in yard/hour, how is fabric thickness expressed?

    <p>Based on courses per inch</p> Signup and view all the answers

    What factors contribute to feeder density in fabric production calculations?

    <p>Number of feeders and machine diameter</p> Signup and view all the answers

    The constant K in loop length calculations is defined as which factor?

    <p>A pre-determined constant specific to machine settings</p> Signup and view all the answers

    Study Notes

    Knitting Production Calculations

    • Knitting production calculations are crucial for efficiency, material use, and pricing.
    • Calculations involve production, machinery needs, raw materials, and finished product costs.
    • Calculations determine selling price competitiveness.

    Machine Speed

    • Machine speed can be expressed in three ways:
      • Revolutions per minute (RPM): Specific to a machine and diameter. Larger machines may have lower RPMs.
      • Circumferential speed (m/sec): Constant for a given machine model and diameter, allowing RPM calculation for varying diameters. Average is around 1.5 m/sec; "high speed" is 2 m/sec. Modern machines can reach 1.6-1.7 m/sec under factory conditions. Laboratory conditions may allow speeds of 2 m/sec.
      • Speed factor (RPM x diameter in inches): Used for calculating RPM for a particular machine diameter. Average is around 1.5 m/sec; "high speed" is 2 m/sec.

    Number of Feeds

    • Number of feeds can be expressed as total for a specific cylinder diameter.
    • Feeds per inch of cylinder diameter can also be used.

    Production Calculations

    • Productivity calculation helps schedule production and provide delivery dates.
    • Production and efficiency calculations provide important considerations for weft knitting machines, including length, width, and weight.

    Formulas

    • Weight of fabric produced:
      • Several formulas are available to calculate produced weight, including formulas considering efficiency.
    • Grams per square meter (GSM):
      • Multiple methods are described, including GSM equals stitch density * loop length * count / 100
    • Another method accounts for stitch density, loop length, count, and a constant factor (Ks) which varies by fabric type.

    Yarn and Fabric Parameters

    • Key parameters for circular knitting production include: yarn count, stitch length/loop length, stitch density, wales per inch, courses per inch.
    • Formulas, methods, and calculations relating to length, width, weight, RPM, number of feeds, and other parameters are provided to calculate fabric and yarn-related production figures.

    Machine Parameters

    • Essential machine parameters for production calculations include: machine speed (RPM), machine diameter, machine gauge, number of feeders, and machine efficiency.

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    Related Documents

    10 Weft Knitting Production Calculations PDF

    Description

    Test your knowledge on knitting production calculations and machine speed. This quiz covers the necessary formulas and concepts for efficient material use and pricing in knitting production. Understand the significance of machine speed and the factors influencing production rates.

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