Sand ballasting with paper, commonly known as scrapping is the most widely used process for creating blasting effect. It is usually done by mounting the garment on rubber balloons. After mounting the garment air balloon is filed with air to expose the area to operator. It is important to fill the pressure
Hand sand is step which is generally being done in rigid form of garments to get distress look. Locations can be front thigh & back seat or its can be overall / global application as per Standard. Emery paper is being used to scrape the garments in particular placement & design. Emery paper comes in different number generally start from 40 till 600 and above , higher the number finer the emery paper, lower the coarseness of the paper. In garment industry from 220 , 320 & 400 number papers are most popular & widely used.
Purpose of doing this process is make used worn out look to the garments.
The most important factor is to select right number of paper according to the fabric strength & intensity need. Feathering / merging white sanded part to dark blue area in such way that it should look natural & not artificial.
Scraping can be done on inflated rubber balloons for better effect ( horizontal or vertical its up to operators convenience ) , even it can done plain wooden board of garment size & hand pressure should be uniform in order to get better results.
Hand sanding must be started from intense part & feathering out on less intense part gradually. One garment must by done by one operator only to have balance intensity on both the legs.