1. Look at the positive and negative side --- 2. The resolution of the area with glue --- 3. Size limit --- 4. Add ear and position. 1. Look at the positive side and the negative side: The positive and negative sides here do not have to give the product a positive or negative side. What we need to distinguish here is, which side is the first to use when the customer uses the product? Our product is based on the design drawings provided by the customer to design the production process sequence, this is the first thing to understand. The glue surface that customers usually need to use first is a lighter release paper, which is convenient for customers to use. When there are ears or positioning holes in the double-sided adhesive products, the concept of "front and back" will be very easy to confuse. Simply explain: The so-called positive is a complete finished product in front of you. The side that we see clearly shows that the face of the product's shape is the so-called front face, and the face that we cannot see is called the reverse face or the glue face. The opposite of the product with the ear is the face that the customer first needs to use. It is a face-up punch. With a positioning hole, the customer uses a lighter release-type paper adhesive object that is pulled to the front. At this time, the front surface of our product is a plastic surface, and some people also call it a reverse surface. In short, we have to determine the surface that the customer first uses based on the information conveyed on the customer's drawings. Subsequent design work can only be carried out.