After washing the clothes, the wearability of the fabric cannot reach the optimal value, and wrinkles of varying degrees will be generated. In order to make the clothes flat and beautiful, it must be ironed (ie, finishing and ironing). It is to make the clothing flat, stiff, clear fold lines, fit and full of three-dimensional sense. It is to apply the appropriate temperature, humidity (moisture) and pressure to the garment within a certain period of time without damaging the wearing performance and style characteristics of the garment, so that the fiber structure changes and thermoplastic deformation occurs. . So the basic process conditions for ironing are temperature, humidity and pressure.
I. Temperature: The various types of fibers that make up clothing materials are thermoplastic. Thermosetting and thermoplastic denaturation of clothing must be achieved through the action of temperature. The higher the temperature, the better the styling effect, but the ironing temperature of various clothing materials should be lower than its dangerous temperature (decomposition temperature and melting point), so as not to damage the appearance and performance of the clothing. The various fibers constituting the clothing can withstand different temperatures due to their different heat resistance. See Section III of this chapter for the ironing temperatures of various fabrics.
2. Humidity: After the clothing is exposed to water, the fibers will be wetted, expanded, and stretched. At this time, the clothing will be easily deformed and shaped, but the humidity should be controlled within a certain range. Different fibers have different hygroscopic effects and should be reasonably controlled.
There are dry ironing and wet ironing. Dry ironing is direct ironing with an iron. It is mainly used for ironing garments that are prone to watermarks when exposed to moisture (silk silk) or high shrinkage when exposed to damp and heat (vinyl cloth), and ironing of thin clothing such as cotton, chemical fiber, silk, and linen. Sometimes for thick coats and woolen sweaters, first use wet ironing, then dry ironing. This can make all parts of the clothing flat and stiff, without shells and hangs, and keep the clothing flat for a long time.
3. Pressure: A certain ironing pressure helps to overcome the resistance between molecules and fibers and yarns, so that the clothing can be deformed or shaped according to people's requirements. As the pressure increases, the flatness of the garment and the pleating retention increase. As the pressure increases, the yarn and fabric are squashed, the thickness of the fabric becomes thinner and the contrast gloss increases. Excessive stress can also cause aurora in clothing. The ironing pressure of the garment should be determined according to the requirements of the material, shape and fold of the garment. For creases, creases and sizing of pleated skirts, the pressure should be greater. For fleece materials such as corduroy, the pressure should be low or ironed. For the plush and other clothing, steaming should not be used for ironing, so as not to cause the fluff to fall down or produce aurora and affect the quality.
Ironing is a physical movement. To meet the predetermined quality requirements, it is necessary to cooperate closely with parameters such as temperature, humidity, pressure and time.