Collar collapse of sweaters can be handled by threading ironing, hot water ironing, necking ironing and sewing elastic bands inside. Threading ironing is to prepare a silk thread that exceeds the circumference of the neckline, put the drawn silk thread on the loose neckline, tie it tightly, iron it with an electric iron, and then untie it, so that the neckline can be restored to its original state. Hot water ironing means tying the neckline of the sweater with a rubber band, ironing the tied neckline position of the sweater with hot water for 5 minutes, and then flattening and shaping the sweater to dry. Tie the neckline for ironing. First tie the pleats with a rubber band, then iron the pleated neckline with an iron, and then ventilate the sweater to dry. The last method is to sew the elastic band inside, make the elastic band round, sew it in the loose sweater collar, and then turn the collar over.

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