What is the difference between POF and PE shrink film?

Polymer

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Linear low-density polyethylene (LLDPE) is a substantially linear polymer (polyethylene), with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins. Linear low-density polyethylene differs structurally from conventional low-density polyethylene (LDPE) because of the absence of long chain branching. The linearity of LLDPE results from the different manufacturing processes of LLDPE and LDPE. In general, LLDPE is produced at lower temperatures and pressures by copolymerization of ethylene and such higher alpha-olefins as butene, hexene, or octene. The copolymerization process produces an LLDPE polymer that has a narrower molecular weight distribution than conventional LDPE and in combination with the linear structure, significantly different rheological properties.[citation needed]

Production and properties

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The production of LLDPE is initiated by transition metal catalysts, particularly Ziegler or Philips types of catalyst. The actual polymerization process can be done either in solution phase or in gas phase reactors. Usually, octene is the comonomer in solution phase while butene and hexene are copolymerized with ethylene in a gas phase reactor. LLDPE has higher tensile strength and higher impact and puncture resistance than does LDPE. It is very flexible and elongates under stress. It can be used to make thinner films, with better environmental stress cracking resistance. It has good resistance to chemicals. It has good electrical properties. However, it is not as easy to process as LDPE, has lower gloss, and narrower range for heat sealing.[citation needed]

Processing

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LDPE and LLDPE have unique rheological or melt flow properties. LLDPE is less shear sensitive because of its narrower molecular weight distribution and shorter chain branching. During a shearing process, such as extrusion, LLDPE remains more viscous and, therefore, harder to process than an LDPE of equivalent melt index. The lower shear sensitivity of LLDPE allows for a faster stress relaxation of the polymer chains during extrusion, and, therefore, the physical properties are susceptible to changes in blow-up ratios. In melt extension, LLDPE has lower viscosity at all strain rates. This means it will not strain harden the way LDPE does when elongated. As the deformation rate of the polyethylene increases, LDPE demonstrates a dramatic rise in viscosity because of chain entanglement. This phenomenon is not observed with LLDPE because of the lack of long-chain branching in LLDPE allows the chains to slide by one another upon elongation without becoming entangled. This characteristic is important for film applications because LLDPE films can be downgauged easily while maintaining high strength and toughness. The rheological properties of LLDPE are summarized as "stiff in shear" and "soft in extension". LLDPE can be recycled, though into other things like trash can liners, lumber, landscaping ties, floor tiles, compost bins, and shipping envelopes.

Application

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LLDPE has penetrated almost all traditional markets for polyethylene; it is used for plastic bags and sheets (where it allows using lower thickness than comparable LDPE), plastic wrap, stretch wrap, pouches, toys, covers, lids, pipes, buckets and containers, covering of cables, geomembranes,[1] and mainly flexible tubing. In 2013, the world market for LLDPE reached a volume of $40 billion.[2]

LLDPE manufactured by using metallocene catalysts is labeled mLLDPE.

See also

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References

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Where are BOPP films used?

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• Modern Plastic Mid-October Encyclopedia Issue, page 56 and 61

• Linear low-density polyethylene at Wikimedia Commons
• [1] Example of LLDPE Physical Properties

As a POF Factory, I would like to share some information with you. Shrink Film has high puncture resistance, good shrinkage and certain shrinkage stress. It is mainly used in the sales and transportation of various products to stabilize, cover and protect products. The shrink wrap not only has a beautiful appearance, but also functions as a moisture-proof, dust-proof, anti-loose, anti-theft, and collection.

POF Shrink Film has the characteristics of large tensile strength, low density, high shrinkage, good gloss, aging, and good opening. The application range is expanding and it will gradually become the mainstream of the heat shrinkable film market.

1.Cost

POF specific gravity is 0.92, thickness is the thinnest 0.012mm, actual unit cost is lower. PE specific gravity is 0.92, thickness is the thinnest 0.03 or more, actual unit cost is higher. PVC specific gravity 1.4, thickness is the thinnest 0.02mm, the actual unit cost is higher.

2. Physical properties

POF is thin and tough, uniform in thickness, good in moisture resistance, soft in texture, high in tensile strength, high in tear strength, and adjustable in shrinkage. Due to the presence of LLDPE, it is more resistant to stagnation. PE is thick and tough, uniform in thickness, and good in moisture resistance. The texture is soft. The tear strength is lower than POF, but much higher than PVC, the shrinkage rate is poorly adjustable. The resistance is not as good as POF. PVC is thick and brittle, uneven thickness, poor moisture resistance, hard and brittle texture, low strength, shrinkage low rate and poor resistance to cockroaches.

3. Cold resistance and other physical properties

POF is excellent in cold resistance, not hard or brittle at -50 °C, and is not easy to be broken. It can be used for frozen food packaging. After shrink packaging, -50 °C - 95 °C is stored for a long time, stable and stable. Static and anti-fog treatment It is not easy to pollute dust, keep the product clean and bright. PE is excellent in cold resistance. After winter or freezing, it will not be hard and not embrittled, so the transportation is not easy to break. It has static elimination treatment, is not easy to dust, and can keep the product clean. PVC Extremely cold-resistant, embrittlement occurs in winter or after freezing, so it is easy to break during transportation. The longer the shrink packaging, the tighter the shrinkage will be, the deformation of the package. No static elimination, easy to contaminate dust, and the product pollution is blurred.

4. Processing performance

POF processing process does not produce moisture or adhere to the sealing rod, easy maintenance and operation. High toughness, smoothness and tamper resistance make it suitable for automatic packaging of high-speed production lines. PE processing does not produce moisture, nor does it stick to the seal. Stick, easy to maintain and work. High toughness, low entanglement, can be used for automatic packaging of high-speed production lines. PVC processing will produce volatiles, easy to cause mechanical damage, and easy to stick to the sealing rod, inconvenient operation, difficult maintenance.

5. Security

After shrinking the POF, the corners of the seal are soft and will not cut the human hand, and it is also resistant to sputum. After PE shrink packaging, the sealing corners are soft and will not cut the hands. After the PVC shrink packaging, the corners of the sealing are hard and sharp, easy to cut.

6. Environmental sanitation

POF is non-toxic and does not produce toxic odor during processing. It complies with US FDA and USDA standards. PE is non-toxic, does not produce toxic gases during processing, and meets the US FDA and USDA standards. PVC is toxic, processing will produce odor, toxic gases, and gradually banned.

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