LAUSR

The biaxial stretching polyamide 6 (PA6) film is widely used for food and industrial products packaging, because it has good physical properties, such as high toughness, high tensile strength, heat resistance, solvent resistance, hard wearing properties, and gas barrier properties. For this reason, PA6 becomes more important for food packaging and industrial usage. So there are many papers which reported PA6 film.[1–15] Polyamide 6 film has inferior oxygen gas barrier performance. Kcoated film, which coats the surface of biaxial stretching PA6 film with polyvinylidene chloride raise the oxygen barrier performance, is used. When this film is incinerated, it generates toxic gas such as chlorine gas and dioxin. The development of oxygen gas barrier film without Kcoated layer is desired. As a gas barrier resin, poly (mxylene adipamide) (MXD6) was selected. The previous report discussed an oxygen gas barrier PA6/MXD6 blend film which satisfied formability and physical property using blending technology.[7] The patent describes PA 6 and MXD6 multilayered film,[2,3] but the property of easy straight line cut is not available. The bag is sometimes required to open easily and safely, for children and elderly people. The retort food is heated in the boiling water and then is opened at high temperature. In the medical field, there are many applications, where we cannot use a pair of scissors for safety and hygiene reasons, so the development of a film with the easy open access is desired. For this reason, it is expected to improve gas barrier and easy straight cut performance for a larger market. So, in this research, both the stretching methods and PA6 blends, which influenced physical properties, were investigated in terms of dynamics and structure development for biaxial stretching films. There are three different stretching methods which can produce polyamide 6 films, namely the simultaneous biaxial stretching,[16,17] the sequential biaxial stretching,[16,17] and the double bubble tubular process.[1,10–20] The difference among the three stretching methods and film properties was reported in the previous paper.[21] It was found that the simultaneous biaxial stretching process is fit for PA6, because PA6 had a high crystallization speed and the hydrogen bond was easily created Received: 21 November 2017 | Accepted: 4 February 2018 DOI: 10.1002/adv.21955