Flexible packaging glue two dry glue is mainly in the summer. It is hot in summer, and the aluminum foil layer of the packaging film breaks under the action of external force and internal pressure for a long time, resulting in the water and air in the air into the sealant through the packaging film, and the sealant will react with water and air to lead to the curing of the sealant. If the nail is not strong, it may also cause moisture through the nail seal is not strict place into the sealant, resulting in dry glue at both ends.