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Abstract: |
There is the history over the half century on the thermobonding of plastics packaging material by the heat sealing, and large contribution has be made to be packaging utilization of the plastic material. The basic important function of packaging for the consumer is easiness in opening."The difficulty openability" of the Cup, Tray and Film packaging are an important problem of the packaging mentioned in the primacy problem of UD of packaged goods. The ASTM F88-* (enactment in 1968) which becomes a worldwide standard of the heat sealing management is clarified with "It is the achievement of openability and closability which the ultimate problem of the heat sealing technique is a basic function of the packaging". However, rational measures are unfinished still. Openability and Closability have expectation function which is contrary in the equal mechanical characteristic each other. Tear opening method of "notch" system has been applied to many present goods. In this method, it becomes "refuse" on the table, potsherds such as broken bag scatter, and the packaging function after it opens the resealing by doing difficult, has been lost. It is a problem that the openability is made to reflect peeling seal function of heat sealing based on the stress analysis of the opening and operation. That is to say, it reaches lastly the control of melting surface temperature which qualifiedly demonstrates the design performance of packaging material of the control of the openability. In this paper, next item is discussed. (1) The standardization of the stress mechanism of [The pluck opening] is attempted. (2) It clarifies the mutual relationship of Six Elements [ (a)Pluck line size, (b)Pluck distance, (c)Pluck force, (d)Heat sealing strength,(e) Peeling width, (f)Elongation of material] concerning the openability. (3) Evaluation and improvement of the openability of the market goods are shown by this study.
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