Deutsch Espanol Francais Italiano Portugues Japanese Korean Arabic Russian

+86-15966835076 sales@plastmachine.cn

Facebook
Twitter
Youtube
LinkedIn
Pinterest

Qingdao Precision Machine Co., Ltd.
  • Home
  • About us
  • Products
    • PLASTIC BOARD/SHEET/FILM MACHINE
      • SPC FLOOR SHEET MACHINE
      • PVC WPC FOAM BOARD MACHINE
      • PVC WPC WALL PANEL MACHINE
      • LVT FLOORING MACHINE
      • PVC MARBLE SHEET MACHINE
      • PVC FREE FOAM BOARD MACHINE
      • PP HOLLOW BUILDING BOARD MACHINE
      • PVC RIGID SHEET MACHINE
      • PVC BAMBOO CARBON BOARD MACHINE
      • PS PP BLISTER SHEET MACHINE
      • WPC HOLLOW DOOR BOARD MACHINE
      • PE OCEAN PEDAL EXTRUSION MACHINE
      • PE GAS WARNING BOARD MACHINE
      • PVC CO EXTRUSION SHEET MACHINE
      • PE PAVING BOARD MACHINE
      • PP PE CUTTING BOARD MACHINE
      • PE PP CAP BRIM SHEET MAKING MACHINE
      • PP CO EXTRUSION SHEET MACHINE
      • PVC HOLLOW FENCE BOARD PRODUCTION LINE
      • PP PE PS ABS SHEET MACHINE
      • PET SHEET MACHINE
      • PVC TRANSPARENT SHEET MACHINE
      • PC PMMA COMPOSITE OPTICAL SHEET MACHINE
      • PP PC HOLLOW CORRUGATED SHEET MACHINE
      • PP/PC HOLLOW GRID BOARD EXTRUSION LINE
      • PLASTIC ROOF TILE MACHINE
      • GEOMEMBRANE WATERPROOF MEMBRANE PRODUCTION LINE
      • HIGH SPEED FILM BLOWING MACHINE
      • PVC WIDE WIDTH FLOOR LEATHER MACHINERY
      • PLASTIC CUSHION MAT(CARPET)EXTRUSION LINE
      • CAST FILM MACHINE
      • EPE FOAM SHEET(FILM) EXTRUSION LINE
      • PP/HIPS/PE/PET/EVA/EVAOH SHEET MACHINE
      • XPS FOAM BOARD MACHINE
      • XPE FOAM SHEET MACHINE
      • TPU FILM PRODUCTION LINE
    • PLASTIC PROFILE MACHINE
      • PE WPC OUTDOOR PRODUCT MACHINE
      • PVC WPC INDOOR PRODUCT MACHINE
      • PVC IMITATION MARBLE PROFILE MACHINE
      • PE MICRO FOAMING BEACH CHAIR MACHINE
      • PVC PRICE TAG MACHINE
      • PVC DOOR WINDOW PROFILE MACHINE
      • PVC OUTDOOR SIDING BOARD PRODUCTION LINE
      • PVC YIN YANG CORNER PRODUCTION LINE
      • PVC PU SIDELINE EXTRUSION MACHINE
      • PVCU PROFILE EXTRUSION MACHINE
      • PLASTIC SEAL STRIP EXTRUSION LINE
      • PVC WINDOW SILL BOARD MACHINE
      • PVC HOSPITAL HANDRAIL MACHINE
      • PVC CHICKEN TROUGH MACHINE
      • PVC FOLDING DOOR MACHINE
      • PC PMMA PROFILE MACHINE
      • WPC STAIR HANDRAIL MACHINE
      • PVC WIRE TROUGH MACHINE
      • PVC WATERSTOPPER PROFILE MACHINE
      • PP PE ABS WELDING ROD MACHINE
      • PVC EDGE BANDING MACHINE
      • PS FOAM PICTURE FRAME MACHINE
      • PVC SKIRTING EXTRUSION MACHINE
      • PET SOLAR COMPOSITE FRAME PRODUCTION LINE
      • PP、PE、PVC、PC、ABS PROFILE EXTRUSION MACHINE
    • PLASTIC PIPE MACHINE
      • PVC FIBER REINFORCED PIPE MACHINE
      • PVC PU PE EVA LAYFLAT HOSE MACHINE
      • PVC WATER SUPPLY PIPE MACHINE
      • PVC PU STEEL WIRE REINFORCED HOSE MACHINE
      • PU SPIRAL STEEL WIRE REINFORCED PIPE MACHINE
      • PE PP PVC PA SINGLE-WALL CORRUGATED PIPE EXTRUSION LINE
      • LARGE DIAMETER(HDPE/MDPE)GAS/WATER SUPPLY PIPE PRODUCT LINE
      • U-PVC/C-PVC PIPE PRODUCTION LINE
      • LED LIGHT PC TUBE PRODUCTION LINE
      • MPP ELECTRIC PROTECTION PIPE MACHINE
      • PE LARGE CALIBER HOLLOW WALL WINDING PIPE PRODUCTION LINE
      • PVC PE POROUS PIPE PRODUCTION LINE
      • PE CARBON SPRING PIPE MACHINE
      • COD CABLE BUNDLE TUBE PRODUCTION LINE
      • PE SILICON CORE TUBE MACHINE
      • PPR PIPE EXTRUSION MACHINE
      • ALUMINUM-PLASTIC COMPOSITE PIPE PRODUCTION LINE
      • PEX/PERT HEAT-RESISTANT FLOOR HEATING PIPE MACHINE
      • PE PRESTRESSED CORRUGATED PIPE MACHINE
      • PVC TPU MECIAL TUBE EXTRUSION MACHINE
      • PE AERATION TUBE MACHINE
      • METAL PRESTRESSED CORRUGATED PIPE MACHINE
      • HDPE THREADING PIPE MACHINE
      • HDPE/PP/PVC DOUBLE WALL CORRUGATED PIPE MACHINE
      • PU TUBE MACHINE
      • PP 3LAYER CO EXTRUSION SILENT PIPE MACHINE
      • PVC REINFORCED PIPE EXTRUSION MACHINE
      • PLASTIC BAR ROD EXTRUSION MACHINE
      • PA NYLON TUBE MACHINE
      • ABS PIPE EXTRUSION MACHINE
    • PET PP PE STRAPPING BAND MACHINE
      • PE FIBER STRAPPING MACHINE
      • PET STRAPS PRODUCTION LINE
      • PP STRAPS BAND MACHINE
    • RECYCLED PLASTIC GRANULATION MACHINE
      • PVC PELLETISING MACHINE
      • PE PP PELLETISING MACHINE
      • PE PP WPC GRANULE MAKING MACHINE
    • THE POLYMER MATTRESS CUSHION PILLOW MACHINE
    • BIODEGRADABLE PLASTICS MACHINERY
    • PLASTIC EXTRUSION AUXILIARY MACHINE
    • PLASTIC EXTRUDER
    • LAMINATING AND HOT STAMPING MACHINE
    • BOARD PROFILE UV PAINTING MACHINE
    • PLASTIC MONOFILAMENT MACHINE
    • PLASTIC NET MACHINE
    • MELTBLOWN CLOTH MACHINE
    • PLASTIC PRODUCT
    • FACE MASK MACHINE
      • N95 KN95 FACE MASK MACHINE
      • FLAT FACE MASK MACHINE
      • MEDICAL MASK NOSE BRIDGE STRIP MACHINE
  • News
    • Company news
    • Industry-news
  • F.A.Q
    • SPC FLOOR SHEET F.A.Q
    • PVC WPC FOAM BOARD F.A.Q
  • Feedback
  • Contact us

Industry-news

  1. Home
  2. News
  3. Industry-news
  4. What is LLDPE plastic film and what are ...

What is LLDPE plastic film and what are its main uses?

What is LLDPE plastic film and what are its main uses? 

Production and characteristics The production of LLDPE starts with transition metal catalysts, especially of the Ziegler or Phillips type. The new process based on cycloolefin metal derivative catalysts is another option for LLDPE production. The actual polymerization reaction can be carried out in solution and gas phase reactors. Generally, octene and ethylene are copolymerized in a solution phase reactor, butene. Hexene and ethylene are polymerized in a gas-phase reactor. 

The LLDPE resin produced in the gas-phase reactor is in the form of granules and can be sold as powder or further processed into pellets. A new generation of ultra-LLDPE based on hexene and octene has been produced by Mobile and Union Carbide. Companies such as Novacor and Dow Plastics launched. These materials have great toughness limits and have new potential in the application of automatic bag removal. Very low density PE resin (density below 0.910g / cc.) Has also appeared in recent years. VLDPES has flexibility and softness that LLDPE cannot reach. The characteristics of resins are generally reflected in the melt index and density. The melt index can reflect the average molecular weight of the resin and is mainly controlled by the reaction temperature. The average molecular weight is independent of the molecular weight distribution (MWD). The choice of catalyst affects MWD. The density is determined by the concentration of the comonomer in the polyethylene chain. The comonomer concentration controls the number of short branches (the length of which depends on the comonomer type) to control the resin density. 

The higher the comonomer concentration, the lower the resin density. Structurally, LLDPE differs from LDPE in the number and type of branches, high-pressure LDPE has long branches, while linear LDPE only has short branches. Structurally, LLDPE differs from HDPE only in the number of short branches. HDPE has a small number of short branches, so it is a higher density material. The physical properties of LLDPE are controlled by its molecular weight, MWD and density. LLDPE is superior to LDPE and ultimately depends on its use. Generally, LLDPE is used in all applications to produce more rigid products, although according to the ATSM standard for low-density materials, the density of LLDPE and LDPE is between 0.91 and 0.925. LLDPE forms a higher crystalline structure because there are no long branches. LLDPE's greater crystallinity results in higher rigidity products. This higher crystallinity also increases the melting point of LLDPE compared to LDPE by 10-15 ° C. Higher tensile strength, penetration resistance, tear resistance and increased elongation are the characteristics of LLDPE, making it particularly suitable for film making.

 If hexene or octene are used instead of butene as the comonomer, even impact resistance and tear resistance can be greatly improved. For a given resin at the same melt index and density, the hexene and octene LLDPE resins improved to 300% in impact and tear properties. The longer side chains of hexene and octene resin act like "knotted" molecules between the chains, improving the toughness of the compound. The production of resins with cycloolefin metal derivative catalysts will have unique properties. Narrower MWD, improved comonomer distribution, better film transparency, sealing and impact strength, which are similar to LLDPE produced with Ziegler catalysts. In terms of transparency, LLDPE has similar disadvantages as LDPE. The turbidity and gloss of LLDPE film is not good, mainly because its higher crystallinity causes the film surface roughness. The transparency of LLDPE resin can be improved by blending with a small amount of LDPE. Processing Both LDPE and LLDPE have excellent rheological or melt flow properties. LLDPE has less shear sensitivity because it has a narrow molecular weight distribution and short branches. During shearing (eg extrusion), LLDPE maintains a greater viscosity and is therefore more difficult to process than LDPE with the same melt index.

 In extrusion, the lower shear sensitivity of LLDPE makes the stress of the polymer molecular chain relax faster, and thus the sensitivity of the physical properties to the change of the inflation ratio is reduced in the melt extension, LLDPE in various The strain rate usually has a lower viscosity. In other words, it will not produce strain hardening during stretching like LDPE. As the deformation rate of polyethylene increases. LDPE shows a surprising increase in viscosity, which is caused by molecular chain entanglement. This phenomenon cannot be observed in LLDPE because the lack of long-chain branches in LLDPE prevents the polymer from becoming entangled. This property is extremely important for thin film applications. Because LLDPE film is easy to make thinner film while maintaining high strength and toughness. The rheology of nLLDPE can be summarized as "rigid when sheared" and "soft when stretched". When replacing LLDPE with LLDPE, film extrusion equipment and conditions must be modified. The high viscosity of LLDPE requires greater power of the extruder. And provide higher melt temperature and pressure. The die gap must be widened to avoid a reduction in production due to high back pressure and melt fracture. The general die gap size of LDPE and LLDPE are respectively O. 024 ~ 0. 040 in. And 0. 060-0. 10in.

 The "softness of stretch" of LLDPE is a disadvantage during the film blowing process. The blown film bubble of LLDPE is not as stable as LDPE. The general single-lip wind ring is sufficient for the stability of LDPE. The unique bubble of LLDPE requires a more perfect double-lip wind ring to stabilize. Cooling the internal bubble with a double-lip air ring can increase the bubble stability and at the same time increase the film production capacity at high productivity. In addition to better cooling of the film bubble, many film production plants use the blending method with LDPE to enhance the melting path of LLDPE. LLDPE extrusion can be completed on the existing LDPE film equipment. When it reaches 50%. When processing 100% LLDPE or LLDPE-rich blended materials with LDPE, the general LDPE extruder is used, and equipment must be improved. According to the life of the extruder, the improvement may be to widen the die gap, improve the air ring, modify the screw design for better extrusion, and increase the motor power and torque if necessary. For injection molding applications, there is generally no need to improve equipment, but processing conditions need to be optimized. Rotational molding requires LLDPE to be ground into uniform particles (35 mesh). The process includes filling the mold with powdered LLDPE, heating and biaxially rotating the mold to evenly distribute the LLDPE. 

After cooling, the product is removed from the mold. Applications LLDPE has penetrated most of the traditional markets of polyethylene, including films, moldings, pipes and wires and cables. The anti-leakage mulch is a newly developed LLDPE municipal mulch, a large-scale extruded sheet used as a waste landfill and waste pool liner to prevent leakage or contamination of the surrounding area. Some of LLDPE's film markets, such as production bags, trash bags, elastic packaging, industrial liners, towel liners and shopping bags, all take advantage of this resin with improved strength and toughness. Transparent films, such as bread bags, have been dominated by LDPE because of its better turbidity. However, blends of LLDPE and LDPE will improve strength. Penetration resistance and LDPE film stiffness without significantly affecting film transparency.

Related News

Specifications and precautions of plastic coated hose

Specifications and precautions of plastic coated hose

What is the difference between PET thermal transfer film and PVC thermal transfer film?

What is the difference between PET thermal transfer film and

basic knowledge of pvc crust foam board machine

basic knowledge of pvc crust foam board machine

Analysis of the difference between rubber mats and PVC mats

Analysis of the difference between rubber mats and PVC mats

What to do if you don't install PVC drainage pipes, use these methods to learn in minutes!

What to do if you don't install PVC drainage pipes, use thes

Five common problems in the production of PVC cable pellet extrusion and the solutions

Five common problems in the production of PVC cable pellet e

Product Categories

  • PLASTIC BOARD/SHEET/FILM MACHINE
    • PVC WPC FOAM BOARD MACHINE
    • SPC FLOOR SHEET MACHINE
    • PVC WPC WALL PANEL MACHINE
    • LVT FLOORING MACHINE
    • PVC MARBLE SHEET MACHINE
    • PVC FREE FOAM BOARD MACHINE
    • PP HOLLOW BUILDING BOARD MACHINE
    • PVC RIGID SHEET MACHINE
    • PVC BAMBOO CARBON BOARD MACHINE
    • PS PP BLISTER SHEET MACHINE
    • WPC HOLLOW DOOR BOARD MACHINE
    • PE OCEAN PEDAL EXTRUSION MACHINE
    • PE GAS WARNING BOARD MACHINE
    • PVC CO EXTRUSION SHEET MACHINE
    • PE PAVING BOARD MACHINE
    • PP PE CUTTING BOARD MACHINE
    • PE PP CAP BRIM SHEET MAKING MACHINE
    • PP CO EXTRUSION SHEET MACHINE
    • PVC HOLLOW FENCE BOARD PRODUCTION LINE
    • PP PE PS ABS SHEET MACHINE
    • PET SHEET MACHINE
    • PVC TRANSPARENT SHEET MACHINE
    • PC PMMA COMPOSITE OPTICAL SHEET MACHINE
    • PP PC HOLLOW CORRUGATED SHEET MACHINE
    • PP/PC HOLLOW GRID BOARD EXTRUSION LINE
    • PLASTIC ROOF TILE MACHINE
    • GEOMEMBRANE WATERPROOF MEMBRANE PRODUCTION LINE
    • HIGH SPEED FILM BLOWING MACHINE
    • PVC WIDE WIDTH FLOOR LEATHER MACHINERY
    • PLASTIC CUSHION MAT(CARPET)EXTRUSION LINE
    • CAST FILM MACHINE
    • EPE FOAM SHEET(FILM) EXTRUSION LINE
    • PP/HIPS/PE/PET/EVA/EVAOH SHEET MACHINE
    • XPS FOAM BOARD MACHINE
    • XPE FOAM SHEET MACHINE
    • TPU FILM PRODUCTION LINE
  • PLASTIC PROFILE MACHINE
    • PE WPC OUTDOOR PRODUCT MACHINE
    • PVC WPC INDOOR PRODUCT MACHINE
    • PVC IMITATION MARBLE PROFILE MACHINE
    • PE MICRO FOAMING BEACH CHAIR MACHINE
    • PVC PRICE TAG MACHINE
    • PVC DOOR WINDOW PROFILE MACHINE
    • PVC OUTDOOR SIDING BOARD PRODUCTION LINE
    • PVC YIN YANG CORNER PRODUCTION LINE
    • PVC PU SIDELINE EXTRUSION MACHINE
    • PVCU PROFILE EXTRUSION MACHINE
    • PLASTIC SEAL STRIP EXTRUSION LINE
    • PVC WINDOW SILL BOARD MACHINE
    • PVC HOSPITAL HANDRAIL MACHINE
    • PVC CHICKEN TROUGH MACHINE
    • PVC FOLDING DOOR MACHINE
    • PC PMMA PROFILE MACHINE
    • WPC STAIR HANDRAIL MACHINE
    • PVC WIRE TROUGH MACHINE
    • PVC WATERSTOPPER PROFILE MACHINE
    • PP PE ABS WELDING ROD MACHINE
    • PVC EDGE BANDING MACHINE
    • PS FOAM PICTURE FRAME MACHINE
    • PVC SKIRTING EXTRUSION MACHINE
    • PET SOLAR COMPOSITE FRAME PRODUCTION LINE
    • PP、PE、PVC、PC、ABS PROFILE EXTRUSION MACHINE
  • PLASTIC PIPE MACHINE
    • PVC FIBER REINFORCED PIPE MACHINE
    • PVC PU PE EVA LAYFLAT HOSE MACHINE
    • PVC WATER SUPPLY PIPE MACHINE
    • PVC PU STEEL WIRE REINFORCED HOSE MACHINE
    • PU SPIRAL STEEL WIRE REINFORCED PIPE MACHINE
    • PE PP PVC PA SINGLE-WALL CORRUGATED PIPE EXTRUSION LINE
    • LARGE DIAMETER(HDPE/MDPE)GAS/WATER SUPPLY PIPE PRODUCT LINE
    • U-PVC/C-PVC PIPE PRODUCTION LINE
    • LED LIGHT PC TUBE PRODUCTION LINE
    • MPP ELECTRIC PROTECTION PIPE MACHINE
    • PE LARGE CALIBER HOLLOW WALL WINDING PIPE PRODUCTION LINE
    • PVC PE POROUS PIPE PRODUCTION LINE
    • PE CARBON SPRING PIPE MACHINE
    • COD CABLE BUNDLE TUBE PRODUCTION LINE
    • PE SILICON CORE TUBE MACHINE
    • PPR PIPE EXTRUSION MACHINE
    • ALUMINUM-PLASTIC COMPOSITE PIPE PRODUCTION LINE
    • PEX/PERT HEAT-RESISTANT FLOOR HEATING PIPE MACHINE
    • PE PRESTRESSED CORRUGATED PIPE MACHINE
    • PVC TPU MECIAL TUBE EXTRUSION MACHINE
    • PE AERATION TUBE MACHINE
    • METAL PRESTRESSED CORRUGATED PIPE MACHINE
    • HDPE THREADING PIPE MACHINE
    • HDPE/PP/PVC DOUBLE WALL CORRUGATED PIPE MACHINE
    • PU TUBE MACHINE
    • PP 3LAYER CO EXTRUSION SILENT PIPE MACHINE
    • PVC REINFORCED PIPE EXTRUSION MACHINE
    • PLASTIC BAR ROD EXTRUSION MACHINE
    • PA NYLON TUBE MACHINE
    • ABS PIPE EXTRUSION MACHINE
  • PET PP PE STRAPPING BAND MACHINE
    • PE FIBER STRAPPING MACHINE
    • PET STRAPS PRODUCTION LINE
    • PP STRAPS BAND MACHINE
  • RECYCLED PLASTIC GRANULATION MACHINE
    • PVC PELLETISING MACHINE
    • PE PP PELLETISING MACHINE
    • PE PP WPC GRANULE MAKING MACHINE
  • THE POLYMER MATTRESS CUSHION PILLOW MACHINE
  • BIODEGRADABLE PLASTICS MACHINERY
  • PLASTIC EXTRUSION AUXILIARY MACHINE
  • PLASTIC EXTRUDER
  • LAMINATING AND HOT STAMPING MACHINE
  • BOARD PROFILE UV PAINTING MACHINE
  • PLASTIC MONOFILAMENT MACHINE
  • PLASTIC NET MACHINE
  • MELTBLOWN CLOTH MACHINE
  • PLASTIC PRODUCT
  • FACE MASK MACHINE
    • N95 KN95 FACE MASK MACHINE
    • FLAT FACE MASK MACHINE
    • MEDICAL MASK NOSE BRIDGE STRIP MACHINE

Links

Company Facebook PageCompany Youtube Chanel

内页左侧广告1

LatestPost

  • PVC WPC FOAM BOARD FUNCTION
    PVC WPC FOAM BOARD FUNCTION
    2020-04-28
  • Briefly describe the technical measures and novel advantages of the hole forming of the prestressed plastic corrugated pipe equipment
    Briefly describe the technical measures
    2021-08-12
  • an interesting story of PET sheet machine
    an interesting story of PET sheet machin
    2023-03-21

Feedback

Contact Us

008615966835076

+86-15966835076

sales@plastmachine.cn

sales_edison

Qingdao City Shandong Province China

My WhatsApp

Copyright © 2023 Qingdao Precision Machine Co., Ltd. All Rights Reserved.

  • Skype.
  • E-mail
  • Whatsapp
  • Inquiry