Ounce
An ounce is originally a unit of mass in the yard-pound system, and in textiles it mainly indicates the weight per square yard and is used as a guideline for comparing thickness and firmness.
Contents6 sections
Definition and Overview
Ounce is a unit of mass, and the notation oz is used. In the textile field, mainly for denim and canvas, it generally indicates the weight per square yard in ounces. This display of weight per unit area is one way to show fabric weight.
Even with the same ounce value, thickness, stiffness, and appearance vary depending on the material, weave or knit structure, density, and whether it is brushed or resin-finished. For this reason, do not judge fabric performance or wearing comfort by ounces alone; check the composition, fabric weight, and finish as well.
Features and Appearance
Generally, the larger the ounce value, the greater the weight per unit area, and the firmer the hand and stronger presence it tends to have. While it makes it easier to maintain the silhouette of a garment, drape and lightness may be harder to achieve.
Fabrics with a smaller ounce value are easier to take advantage of for lightness and thinness, and are used for layering and spring/summer planning. However, sheerness, strength, and breathability do not simply correlate with ounce value. It is important to check the differences caused by material and structure with the actual fabric.
Main Applications
Ounce indications are often seen in relatively substantial woven fabrics such as denim, canvas, chino cloth, and sailcloth. They are also useful when comparing fabrics for shirts, pants, jackets, workwear, outerwear, bags, and accessories.
Light-ounce fabrics are considered for shirts and light clothing, while medium- to heavy-ounce fabrics are considered for pants, jackets, outerwear, bags, and more. However, applications are not determined by ounces alone; selection is based on the required durability, sewing specifications, and seasonal feel.
Selection and Handling Notes
During planning, compare the standards by checking the display basis for ounces and fabric weight. While ounces are often used as weight per unit area, they may also simply refer to mass. In specifications and fabric standards, clearly state whether the figure is per square yard or per square meter.
Shrinkage cannot be determined from ounce value alone. In particular, cotton and similar materials may change dimensions through washing or pre-wetting, so check the shrinkage rate before mass production and, if necessary, carry out boiling treatment or straightening. If product washing is planned, evaluate the feel and dimensions after washing as well.
Heavy fabrics can become thick at overlapping seam allowances, which may cause needle breakage, skipped stitches, and seam slippage. It is reassuring to adjust the needle, thread, presser foot pressure, and stitch specifications to suit the fabric, and to conduct sewing tests at stepped areas and edges.
Differences from Similar Terms
Fabric weight is a concept that indicates the weight of fabric per a fixed area, and in Japan it is commonly expressed as grams per square meter. Ounce is the unit and customary expression used for that display, and the two are not opposing categories.
Denier is a unit that indicates the weight of yarn or fiber for a fixed length, and it differs in subject from ounce, which indicates the weight per unit area of the entire fabric. Count is also an indicator related to yarn thickness, and it cannot be directly substituted for ounce value.
Frequently Asked Questions
How do you convert fabric ounce and fabric weight?
Fabric ounce usually refers to ounces per square yard. 1 ounce per square yard is roughly equivalent to 34 grams per square meter. However, always check the display basis and measurement conditions, and clearly state the unit in the specification sheet.
If the ounce value is high, is the fabric always thick?
Not necessarily. Ounce value is the weight per unit area, and thickness varies depending on the specific gravity of the material, yarn structure, weaving or knitting density, and brushing or processing. When selecting, check thickness, hand, and structure in addition to ounces.
Can shrinkage after washing be predicted from the ounce value?
Shrinkage cannot be predicted from ounce value alone. Shrinkage is affected by the type of fiber, structure, processing, and washing and drying conditions. Before mass production or product washing, it is necessary to conduct washing tests on the fabric to be used and check the shrinkage rate and changes in appearance.
