Shanghai Daoqin Plastics Co., Ltd.

         film packaging bag large more use hot methods made, has use adhesion methods manufacturing. it 们 几何形状, basic can separation is large type: bag, 三边密封 bag, 四边密封 bag. also can according to bag in 无支撑情况 lower can 否直立站起 separation is type: type bag and non type bag.

        枕形 bag

        枕形 bag, has 叫背封 bag, bag has rear, upper, lower 接缝, make it tool has 枕头 形状, many small food bag commonly used bag packaging. bag rear 接缝形 formed 一 鱼鳍状 封装, in this type of structure in, film inner by in 一起封 upper, from by good bag rear 面突出. another types 封口形式就 heavy 叠封口, its in inner and another outer bonding 起, formed 一 平 封口. due to 鱼鳍形封口 comparison 结实, but also need packaging materials inner is hot 封 就 can, therefore use 广泛. 例如: most Common composite/compounding film bag 子, inner is PE, outer is composite/compounding 基材. heavy 叠形封口 versus for 不够结实, and requirements bag inner outer is hot material, therefore use is very more, from material upper can 节省一点. 例如: non composite/compounding pure PE bag can using/adopting this type of packaging methods. 顶封口 and 底封口 is bag inner material bonding 起.

        三边封口 bag

        三边封口 bag, bag upper has 两 侧接缝 and 一 顶边接缝. bag 子 底边 is water 平折叠 film formed, has is film inner material bonding formed. this type of bag can has 折边也 can has. has 折边时, it can 直立站 in upper. 三边封口 bag types deformation is will 原 折叠形 formed 底边, use bonding methods achieve, this 样, formed 一 四边封口 bag.

        四边封口 bag

        四边封口 bag, usually is types material 顶, and 底边封口 made formed. and front to bag versus ratio, has can can use types different plastics resin material, if it can versus bonding 话, made formed front bonding 四边封口 bag. 四边封口 bag can made formed various 形状, 如心形 or 椭圆形.

        直立 type bag

        直立 type bag, in 装满东西时, can weight in upper. type bag has 折边, has 东西装入时折边就会撑开, make bag has versus for 平 底部站立起. it by use packaging liquid product 如厨房清洁 agent and other, due to it can substitute/replace and bottle and other hard packaging materials, therefore market and use amount 越 越 large. bag design in has water 平 底折边, can use sheet/slice soft packaging materials made formed. in types product in, use sheet/slice film, film by formed M形形 formed 底边;也 can design use 底折边, use 侧边折叠 or 折边, formed heavy 叠 平 sheet/slice 材底部. this type of bag 子不如底部 has bag 子站 牢靠, more used for dry 货而不 is liquid product. in this types lower, product weight will packaging bag 边折撑开, make bag can 够自行站立.

         large bag and high strength bag

        通 commonly used packaging dispersion product, its heavy can 达5000kg. this type of bag tool has high tensile strength, can use liquid product (如 front introduction 集装箱 liquid bag film), also can solid product. bag 子 材质 can use HDPE, PVC and polyester fiber, use most more material is 由PP扁 filament weaving formed. woven bag and liquid product use bag 子, usually has PE film as is inner 衬层. requirements more good retardant property can 时, can use aluminum or PVDC copolymer. is anti water, can use PVC or 者橡胶材 material for bag inner coating. according to material and application features, bag 子 封口 can hot or combined. usually large bag is from 顶部灌装, from 底部排放, can has nozzle or other separation plant/unit, or use simple coarse 暴 割破 method bag 子. for/regarding 露天堆放 bag 子, need in resin material in add outer stabilizer, anti bag 子 早 aging strong/high degree reduce.