DEVICE TO ATTACH TWO SYNTHETIC PLASTIC PARTS SEPARATABLY, AND APPLICATION METHOD OF THIS DEVICE FOR MANUFACTURE OF PACKING CONTAINER TO FILL FLOWABLE SUBSTANCE

摘要

PURPOSE: To separably fit two synthetic plastic parts without necessity to be torn upward or bent by extending a second tear line along at least a first part of a first synthetic plastic part, with a certain distance from a first tear line and forming a tearing strip between these two tear lines. CONSTITUTION: A second tear line 4 is extended parallelly to a first tear line 5 with a distance (a) from the first tear line 5 and the first tear line 5 is formed at the edge of a first welding joint 3. When a tear strip 6 arranged at the two tear lines 4, 5 is torn upward, the strip is automatically separated at the side of the first welding joint 3. Since the second tear line 4 is formed of the first synthetic plastic parts 1 or a weak separation line 7, when the tear strip 6 is pulled up, it is torn along the second tear line 4. The second tear line 4 may be formed by the second welding joint 8.