The package used has two types: heat sealing type and self-adhesive type: heat sealing type includes high-temperature upper belt and low-temperature upper belt, 1030 and 7008 are low-temperature heat sealing type, and the color is transparent; 1040 and 7007 are high temperature heat sealed, and the color is fog. There are two types of self-adhesive: t50vp fog self-adhesive and t50vp-c transparent self-adhesive.—types of upper cover tape

In the production process, the common appearance defects generally include: barb, poor forming, burr, heating mark convex (partial), crease, whitening, deformation, P2 value, thin side wall, thin bottom, white pressing, different color of leather, scratch, scratch, stripe on the surface, etc—types of upper cover tape

Barb, heating mark, convex (eccentric), burr, scratch and deformation shall be the main control, and other appearance defects shall be the secondary control.

（1）   The barb is mainly based on the trial assembly of parts, which is acceptable without affecting the trial assembly of parts.—types of upper cover tape

(2) The heating trace shall not coincide with the sealing and welding joint of the upper belt, and shall not protrude from the surface of the material belt.

(3) The burr at the hole position shall not fall on the hole position or block the hole position.

(4) The surface or side of the material belt shall not be scratched and turn white.