The Investigation of Functions of Heat seal Strength and Heat Sealing Testing Method

摘要

Heat sealing is an important technique of bonding thermoplastic materials. However, only heat sealstrength has been used to evaluate the bonding of thermoplastic material for a long time. The customers of thepackaging products hope for both easiness of opening and completed seal. Heat sealing technology is the mosteconomical for easy opening the package. Manufacturers could not serve customers requirements althoughthey apply the conventional standards such as ASTM F88, F2029, JIS Z 0238. Indeed, the heating temperatureat the interface of bonding affect mainly to heat seal strength. The objectives of this research are proposedtesting method and analysis of the Openability and Closability of heat seal strength. The methodologyused in this research is divided into 2 testing methods; the testing method of heat seal strength with accurateheating temperature, and the testing method of elements generating heat sealing. The first testing method isused for identify the accurate heat seal strength by regarding peculiar thermobonding performance. The secondtesting method is used to identify the close functions and comprehend the peculiar characteristics of materials.With this proposed methodology, it is possible to determine the closing function of heat sealing basedon reliable characteristics of material. The analysis of the peeling energy of adhesive bonding of heat sealingwill be discussed for Closability in this research. Functional Heat Seal Strength (FHSS) is introduced to determinethe generation of pinhole and polyballs by observation the failure of heat seal testing. Experiments inthis research are conducted by using propose innovative testing method with MTMS (The Measurement oftemperature at melting surface). PE/70 material widely used in local market is used in the experiment. Also,this research challenge evaluation method for Closability of heat sealing of thermoplastic materials. The resultshows that Peel seal can guarantee closing ability of material for packaging.