Easy-to-open bag
A bag, biaxially stretched technique for use in bags, sacks, flexible coverings, etc.
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Embodiment 1
[0121] As the amorphous polystyrene copolymer resin, a styrene-methacrylic acid copolymer resin manufactured by PS Japan, G9001 (trade name) (crystallinity: 0%) was used, and a film was formed by a tenter method. The film forming conditions are shown in Table 1. The Vicat softening temperature of the obtained film was 126° C., and the average thickness of the obtained film was 21 μm. Using this film, one surface was subjected to electrical discharge processing so that the contact angle as the surface wettability index was 33 degrees, and an imine primer paste (manufactured by Toyo Motor Corporation, EL- 420 (trade name)), so that the dry coating weight is about 4mg / m 2 After drying, L2340 (trade name) manufactured by Asahi Kasei Chemical Co., Ltd. as a polyethylene resin was extruded on the above-mentioned polystyrene film with a thickness of 20 μm at a die temperature of 320° C. to form a laminated film. The polyethylene side of the obtained laminated film was folded in half...
Embodiment 2
[0124] As the amorphous polystyrene copolymer resin, styrene-methacrylic acid copolymer resin manufactured by PS Japan, G9001 (trade name) (crystallinity: 0%) was used, and acrylic acid manufactured by PS Japan was sequentially chipped and mixed therein. Butyl-styrene copolymerized elastomer, SC004 (trade name), and high-impact polystyrene (HIPS) manufactured by PS Japan Corporation, HT478 (trade name), and their weight ratio was 75:10:15, They are extruded and filmed by tentering. The film forming conditions are shown in Table 1.
[0125] The Vicat softening temperature of the obtained film was 118° C., and the average thickness of the obtained film was 22 μm. It was processed into a laminated film by multilayer lamination in the same way as in Example 1, and a 4-side-sealed bag and a 3-side-sealed bag were made in the same way. The pouches were of good appearance and could be easily torn by hand in a direction generally perpendicular to the sides from the optional location...
Embodiment 3
[0127] As the amorphous polystyrene copolymer resin, styrene-methacrylic acid copolymer resin manufactured by Dainippon Inki Chemical Industry Co., Ltd., リュ-レックス (registered trademark) A-14 (crystallinity: 0%) was used, and a tenter legal film. The film forming conditions are shown in Table 1. The Vicat softening temperature of the obtained film was 133° C., and the average thickness of the obtained film was 25 μm. It is processed by multi-layer lamination with the same method as in Example 1 to make a laminated film, and further the same method is used to make 3-side-sealed bags and 4-side-sealed bags. The pouches were of good appearance and could be easily torn by hand in a direction generally perpendicular to the sides from the optional location of the heat seal line, as well as from the unheated side of the film. The experimental conditions and evaluation results are collectively shown in Table 1.
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Abstract
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