There are several reasons why the carrier tape package may crack:
1. Crack in the upper seal of the metal stamping carrier tape: This is a simple case of mismatch, where the tape simply does not adhere. This is quite obvious and can be easily identified. Simply replace the carrier tape and there will be no significant loss. It is relatively easy to control and prevent.
2. Weak seal: In this case, the carrier tape and the cover tape are adhered, but not tightly. They can be easily peeled open. This is similar to the first case and can be easily identified and replaced with a little attention. This situation mainly arises because the carrier tape and the cover tape are not compatible and cannot be suitable. This is caused by increasing the force of the sealing blade or using a higher temperature. Although there is adhesive on the cover tape, it usually does not show up quickly.
3、Strong adhesion: This sealing adhesion is too strong, it is difficult to peel off, and it is simple to crack. The bonding of the carrier tape and the cover tape is not a matter of the strength of the adhesive, but only suitable. The EIA specification is 20g-80g. However, in practice, it will be adjusted according to the components to be bonded. Specific needs to be combined with their own and downstream customers‘ preferences to decide. To decide how much viscosity to bond, as long as no other four situations occur, use the "carrier tape peeling tester" to select the appropriate viscosity.
4、Night split: This bonding looks good at the time, the adhesion and force are also suitable, but after a day, some of them split after two to three days. This is more risky, if not paying attention to the bonding and aging test of the carrier tape and cover tape, it is easy to cause problems. We recommend that customers use tested cover tape.
5、Plum blossom points: This cracking starts with good bonding at first, but after some time, it starts to appear very fine white dot-like marks on the bonding between the carrier tape and the cover tape, and as the placement time increases, the white dots continue to increase, some of the white dots are connected together, and the bonding also cracks open. This is the most risky, some of the cover tape has also passed the aging test. But if the cover tape itself has unstable product performance, it will also appear the plum blossom points cracking. We recommend that customers bond the products well and conduct random inspections before shipment, which will be safer.