The Differences of Application Between HDPE, LDPE, MDPE As

Well As PP Woven and Non Woven Bag

Definition of LDPE, HDPE, MDPE and PP woven material?

HDPE (high density polyethylene) is manufactured at low temperatures and pressures,

using Ziegler-Natal and misallocate catalysts or activated chromium oxide (known as a

Phillips catalyst). The lack of branches in its structure allows the polymer chains to pack

closely together, resulting in a dense, highly crystalline material of high strength and

moderate stiffness.

On the other hand, LDPE (low density polyethylene) LDPE is prepared from gaseous

ethylene under very high pressures (up to about 350 megapascals, or 50,000 pounds per

square inch) and high temperatures (up to about 350 °C [660 °F]) in the presence of oxide

initiators. These processes yield a polymer structure with both long and short branches.

Because the branches prevent the polyethylene molecules from packing closely together

in hard, stiff, crystalline arrangements, LDPE is a very flexible material. Its melting point

is approximately 110 °C (230 °F).

MDPE (medium density polyethylene) is the mix of LDPE and HDPE.

The other material, PP woven (Polypropylene Woven), is produced through the extrusion

of a wide sheet of PP which is cut into long trends and then is woven together to make a

continuous sheet of woven material. With the character of strength, cost effectiveness and

breathable hole, PP woven material is also a flexible material for packing grocery.

In fact, with different characters, each material has separated feature and to be used for

different function.

How these different materials are used for different purposes of producing packing bag

LDPE material which is soft, smooth and shiny is suitable for producing high quality

packing bags of the luxurious goods like hand watch, clothes, handbags, etc. However,

because of its quality, the price of virgin LDPE material is quite high which a challenge

is for small companies. Therefore, they can suggest the producer adding recycled

materials in order to decrease the price as well as making the bag environmentally

friendly.

HDPE on the other hand, is a popular choice of many companies as the high quality,

cheap price and stiff shape material. Moreover, HDPE enables manufacturer to produce

with thin thickness; therefore, is flexible for diverse kinds of goods. However, to compare

with the LDPE material, the HDPE is not as soft and shiny as LDPE; hence, is preferred

for the industrial products, food and grocery, etc.

MDPE is the combination of LDPE and HDPE. It means MDPE has both of the character

of those two materials: it is softer than HDPE and not smooth as LDPE with the average

thickness. MDPE is invented at the aim of satisfying all requirements of customers. The

customer may hope that the bags are a little soft and shiny but with the cheap price. In

this situation, the MDPE is the best choice.

Those three materials above with their relatively thin thickness have a disadvantage with

some kinds of goods like the heavy machine, the machine with sharp sides, etc. However,

PP woven material with its thickness, strength due to its tight plaited succession as well

as breathable hole makes those tasks easier to fulfill. PP woven allows a safe

transportation with long distance which is now a best choice for export companies.

Moreover, its durability enables the customer to reuse for other purposes.

That is to say, choosing packing bag for the goods are not as simple as people normally

thought it is. It demands that company understand deeply their products and scale to get

suitable ones.

For more information on HDPE, LDPE, MDPE, PP woven bags and other luxurious

Plastic Carrier Bags visit http://hathanhplastic.com

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