How to produce biodegradable packaging bags?
Does it have some special process compared to producing normal plastic bags？
No, it is not a special process, it is just like the plastic manufacturing process, which is produced by blowing a film of particles. The difference is only the raw material.
Biodegradable packaging bag-producing process.
As the biodegradable packaging bags also have the same producing process, is that mean most of the materials contained are the same? No, they are different materials.
The composition of plastics
plastic raw materials mainly contains polyethylene or polypropylene. The formulas are (C2H4)*N and (C3H6)*N,
this molecule has a very stable characteristic, Normally it is not decomposed.
The composition of biodegradable
The biodegradable packaging material did not contain plastic,
the main ingredients of biodegradable bags are cornstarch and PBAT, PLA. part of the rest material is additives.
As the biodegradable film can also use the plastic blowing machine to produce,
you will know that it has a similar character as the plastic film. it is formula is C20H30O10,
and it is full name is Polybutylene terephthalate adipate.
PBAT is a semi-crystalline substance with a crystallinity of 30%,
which is produced by the copolymerization of aliphatic and aromatic substances.
The aliphatic substances are degradable and the aromatic substances have good mechanical properties,
so the degradable materials have the tensile properties of plastic films and degradability.
Biodegeradable raw material
It is also granulated, like plastic raw material.
PBAT is a kind of substance that is modified into lipid by using adipic acid (AA),
terephthalic acid (PTA) and butylene glycol (BDO) as monomers and synthesizing polyadipic acid/butylene glycol terephthalate in a certain ratio,
and PBAT and vegetable starch, such as corn starch or tapioca starch,
are added with additives in a certain ratio,
and degraded material granules are synthesized through high-temperature and high-pressure processing.
Usually, the granules are creamy white or slightly yellow.
The size is close to that of plastic granules.
Similarities and differences
Similarity 1: plastic and degradable materials are both soft and
Similarity 2: plastic and degradable materials can be made into the same bag, the
Difference 1: plastic is usually transparent, while degradable materials are translucent.
Difference 2: the tensile line of plastic is usually 10-15% higher than the degradable material.
Difference 3: plastic can not be degraded, degradable materials can usually be degraded within six months.
Difference 4: Degradable materials do not contain plastic.
Degradable material is as environmentally friendly and reliable to the environment as a towel made of cotton. It just looks somewhat plastic-like,
and that’s because it only has the properties of plastic when made into a similar state and then replaces plastic products.
We know that plastic products are actually very useful and greatly facilitate people’s lives, the only flaw is that plastic can not be decomposed, which also pollutes the environment.
With degradable raw materials, the production process behind them actually the same as plastic.
The first step: blowing film, also is the degradation of material particles in the plastic blowing machine blown into a tube of film. Note that to make ordinary plastic bags, the film is usually out of the tube. The film is wound up as two layers of material.
The second step: If the bags need to print a logo, this step is printing. usually plastic use Gravure printing and flexo printing, and now have digital printing for small quantity.
Third step: folding into sides gusset if making something like t-shirt carrier bags, or extra film cutting for self-adhesive bags,
fourth step: go into the bags-making process, the film will make into t-shirt bags, self-adhesive bags,
zip lock bags, dog poop bags, garbage bags and so on.
usually, self-adhesive bags and zip lock bags are cut and seal bags by heat sealing in the width direction, t-shirt bags,
dog poop bags, and garbage bags in the height direction, those bags usually have a 2 mm seal first, then next step is cut into a bag.
After that, the subsequent process is the packaging of these bags and warehousing.
what type of bags can compostable material be made of
Can compostable material make different bags type?
Yes, it is easy to make the same bags as plastic materials do.
what type of bags can compostable material make then?
- compostable garbage bags, compostable trash bags.
- compostable do pop bags,
- compostable shopping bags,
- compostable T-shirt bags
- compostable self-adhesive bags
- compostable mailer
- compostable Express bags
- compostable envelope bags
- compostable zip lock bags
- compostable zipper bags
which products can be packaged with compostable material? will there be a chemical reaction?
no worries, 99.9% of products can be packaged with compostable material.
- garment, apparel, clothes, underwear, t-shirt, swimwear, home textile, etc.
- toys, gifts, and photo frames.
- printed paper, greeting cards, handmade toys, and tissue.
- cell phone, phone case, dateline, and accessories.
- kichenware, tools, drinkware,beauty care devices.
- food, fruit, and vegetable.
