The raw material of gum bag:
Gather ethylene(Polyethylene, PE)
Call PE.It is ethylene to carry on the organic compound of the high mark son that adds to gather but become.Gathering the ethylene is the generally accepted contact food best material in the world.Not poisonous, tasteless, have no smelly, match a food packing health standard.Gather ethylene thin film, supple transparent, have to defend tide, anti- oxygen, acid-proof, bear alkali and annoy airtight general, hot excellent etc. function.Is a plastics packing printing dosage at most, the most important material.
PVC-PVC
The PVC calls PVC, the molecular formula is(CH2-CH2) a n, is 1 type of most in the vinyl polymer, is only next to gather the second plastics species of ethylene in the world currently.
Shrinkfilm-constringency thin film
Constringency thin film(Shrinkfilm), is a sow in a production line in is pulled to stretch definite direction, in the process of using in is handled by hot air or the infrared ray project light upon then will contractive hot Su plastics thin film.After the hot processing, the thin film tightly binds in being packed a thing, the constringency dint is cooling off a stage to attain the biggest value, and can keep over a long period of time.
LDPE-the low density gather ethylene
The low density gathers ethylene, brief name LDPE is plastics packings in all countries to print the biggest species in industrial convenient quantity.Specific weight is 0.92~0.93, can be floated to water.The crystallinity is low(60%), in the pressure 1000~3000 kgs|the C ㎡ carries on an essence to come together, past call that the high pressure gathers ethylene again.In 23 Celsius degrees, the density is about 0.92.Be applicable to a packing, day of food packing, fiber product to turn a thing packing
HDPE-high definition gathers ethylene
The high definition gathers ethylene and calls HDPE.Come together but become with the low pressure, past again call that the low pressure gathers ethylene.Present ivory, the surface sheen is worse.Processing the thin film can be used to blow Su method and T mold to extrude a craft.Heat-proof bear to steam to cook, resistant to cold bear a refrigeration, defend tide, defend spirit and isolate function well, not easy damaged, strength is 2 times that of LDPE.Very easily open mouth.
BOPP-double to pull to stretch polypropylene thin film
Double stalk to pull to stretch polypropylene thin film, also call a double to pull to stretch polypropylene thin film, English abbreviates code BOPP, its characteristics in order to pull to stretch member definite direction, machine strength, annoy density towards folding strength, and keep tide from separating sex better than common plastics thin film.Compare by the unit area and the cellophane, the unit price is lower than cellophane.Because this kind of thin film clarity best, in print to reappear the color particularly shining beauty behind, is the important base material that the plastics reunites a tetrapak.
没有评论:
发表评论