Shanghai Daoqin Plastics Co., Ltd.

 一, commonly used 4 types plastics bag is types?

1, high pressure polyethylene (PE) plastics bag

high pressure polyethylene (PE) also low density polyethylene (PE) （LDPE）, semi transparent 状态, plastics bag products transparent property generally relatively low pressure polyethylene (PE) good. its main/primary applications has 3 type:

A, food packaging: 糕点, 糖果, 炒货, dry, powder, salt, and other;

B, fiber product packaging: 衬衫, clothing/apparel, product, products;

C, day use product packaging .

2, low pressure polyethylene (PE) plastics bag

low pressure polyethylene (PE) also high density polyethylene (PE) （HDPE）, due to its has relatively high crystallization degree, transparent degree good, generally semi transparent 状态, transparent degree relatively HDPE high pressure polyethylene (PE) material bag products 差. its main/primary applications has 4 type:

A, waste bag, types bag;

B, bag, material bag, bag, bag;

C, bag;

D, woven bag inner bag

3, polypropylene (PP) plastics bag

polypropylene (PP) plastics bag polypropylene (PP) versus for/regarding polyethylene (PE), its crystallization can low need, especially is random polypropylene (PP), crystallization property most low, its plastics bag products transparent degree very for high very more.

main/primary used for packaging textile product, product, clothing/apparel, and other .

front plastics bag due to material structure non property causes, easy color or printing, need surface printing 处理.

4, polyvinyl chloride (PVC) plastics bag

polyvinyl chloride (PVC) plastics bag, polyvinyl chloride (PVC) resin blow molding processing 而, versus for/regarding front plastics bag, its material structure in chlorine this type of material 质, make its crystallization very low, products transparent degree relatively high, meanwhile due to chlorine add 入, make material belt/tape has 一定极 property, easy printing color. its main/primary applications is 2 方面:

A, product bag;

B, bag, product packaging bag, product packaging bag;

二, plastics bag separation more development

above introduction commonly used 4 types plastics bag, is is is small can 够识别. 当然, this 也并不意味 small in 就火眼金睛 what material can 认识, upper in mono separation plastics bag material already very less.

就拿PE 说吧!

PE常以 film 材, sheet/plate or rod 材出现, ratio one-time property plastics bag, is polyethylene (PE) separation structure in property relatively low, surface can comparison low, easy 印字, therefore pure PE plastics bag generally is color semi transparent, and 摸起 没 has PVC film that type of viscous property. in addition PE also tool has very strong/high crystallization property, therefore PE sheet/plate and rod 材材呈现 white transparent 状态.

this is small in upper or 者实验室里看 summary. is to ultra- 市购 material, to this plastics bag, 顿时就傻眼:

当时 small 编就蒙, this also is what material, good PE plastics bag 呢? good color semi transparent 呢? good easy printing 呢? >(PE-LD+PE-LLD)-MD15< this 一串字母 also is what

good 吧, material ratio need color.

猜一 lower 吧, PE-LD应该 is LDPE, low density polyethylene (PE) lowdensity polyethylene, PE-LLD应该 is LLDPE线 type low density polyethylene (PE) linearlow density polyethylene, that MD15 is what 呢? this is method 猜不出 啊, can 乖乖 查资 material.

万 can small 编经 海查之 rear, 终于找 to can 信 说 method:

此 table/sheet can is is its China 国标, has small can 直接搜一 lower GB21660-2008.

in this standards in meanwhile understanding 释 MD 含义: MD is material powder, St is powder, is add material quality separation 数（%）

is positive in reading 此文 你 true positive use table/sheet, small in 此举两 例子:

示例1: add 30%（ quality separation 数）淀 powder （St) low density polyethylene (PE), table/sheet is: ＞（PE-LD)-St30＜

for more filler mixed combined material, 应描述 filler separation content, use 圆括弧 will its in in 间.

示例2: 含15%（ quality separation 数）矿 material powder and 25%（ quality separation 数）淀 powder (St） polypropylene (PP), table/sheet is: ＞PP-（St25+MD15）＜ or ＞PP-（St+MD）40＜

三, commonly used plastics 数字标识知 how much

small in addition also 偷偷 掌握 commonly used general purpose plastics 数字编号, to 数字我就 can is 哪款材质做. this commonly used plastics 数字标识你知 how much 呢? need is 不知道 话, 建议你 most good need 说自己 is polymer/macromolecule （ plastics, 橡胶）, need true comparison 尴尬.

in addition, 三 循 ring in “04”也 for 应 LDPE 代号, if in has 数字, table/sheet this plastics bag is can recycling again utilizing.