First, steam stretching method
The cashmere sweater that has shrunk can try to heat it with a steam iron, then stretch where it shrinks, place it on a towel, and slowly lay flat to dry it. This will restore the cashmere sweater.
Second, the qualitative method of cardboard If shrinking is too powerful, but also use cardboard to match the stereotypes. It is best to cut according to the original cashmere sweater, the thick cardboard sleeves in cashmere sweater, with clips, it is best to use with steam hot.
Third, the dry cleaners in the dry cleaners can find clothes and the same type of special shelves, the cashmere sweater hanging after high-temperature steam treatment, cashmere sweater can be restored to the original body.
Click to check the price of the cashmere sweater. 4. The Amoniya Water Reducing Act dilutes the family's Amoniya water into water. Put the cashmere sweater in the soak for fifteen minutes or so. You can gently stretch the reduced part by hand. Then rinse it with cold water, and then pull it again when it is half dry. However, Amoniya Water has a destructive soap component in cashmere sweaters and is recommended for caution.
Fifth, shaping method This method is best to have an individual-shaped plastic model, and then expand the cashmere sweater. Or you can find some hardboard to expand. If you want to quickly solve it, you can iron it with your iron (careful use for plastic models). This method can guarantee the best shape of cashmere sweater. 
Six, steamer method
1. You can wrap it in a clean white towel, steam it in the steamer for 10 minutes, shake it out slightly, shake the fiber loose, and carefully pull it into its original shape and size. On the back of the sheet or screen, dry it in a well-ventilated area and dry it to restore it. The number of cashmere sweaters washed will gradually lose its original luster. When you add a few drops of vinegar, you will continue to float and rinse. The cashmere sweater will restore its original luster.
2, then use the cardboard to cut into the size and shape of the original sweater, cut the best sandpaper polished, so as not to hook the bad sweater. Put the sweater on the cardboard and fix it with several clothespins at the bottom of the sweater. Then use an iron to repeatedly steam and iron at various parts of the sweater. After cooling completely, remove it.
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3, then shrink the cashmere fiber with a steam iron, and then use two hands to stretch its fiber. It is impossible to stretch a lot of fibers at a time, and it is necessary to repeatedly heat and stretch.
Before stretching, the total length of the stretch should be known, so that the stretching length of each segment is also a few. After all stretching is completed, the total length is measured using a ruler. If the length is not enough, it can be repeated. Pay special attention not to overdraw the size and make the appropriate adjustments. 
How to prevent shrinking cashmere sweater?
First, the water temperature is best around 35 degrees, washing should be gently squeezed by hand, avoid hand rub, rub, twist. Do not use the washing machine.
Second, we must use neutral detergent, when used, the general ratio of water and detergent is 100:3.
Third, slowly add cold water when rinsing, so that the water temperature gradually decreased to room temperature, and then rinse clean.
Fourth, after washing, first hand pressure, press out the water, and then wrapped with a dry cloth pressure, you can also use centrifugal dewatering machine. Note that the sweater can only be placed in a dehydrator after being wrapped in cloth; it cannot be dehydrated for too long and can only be dehydrated for a maximum of 2 minutes.
5. After washing and dehydrating, sweaters should be spread out and ventilated in a ventilated place. Do not hang in the sun or expose them to avoid deformation of the sweater.
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