| 摘要 |
In a packaging system, a unitary element (34) formed substantially completely of thermoplastics with the ability to convert high-frequency electromagnetic radiation into heat is pressed against a container 32 having first and second opposite walls at least one of which is readily flexible into contact with the other, of which the first wall has an outside surface 26 also of thermoplastics with the ability to convert high-frequency electromagnetic radiation into heat and of which the respective opposite inside surfaces 28 are of thermoplastics having, compared with the thermoplastics of the unitary element 34 and the outside surface 26, relatively low ability to convert high-frequency electromagnetic radiation into heat, thereby to press the inside surfaces 28 together, and the unitary element 34 and the outside surfaces 26 are sealed together using high-frequency welding without consequently sealing the inside surfaces 28 together. |
