Sinopec Fujian HDPE Y10050F, specified at nominal density 0.950 g/cm³ and melt flow rate 0.50 g/10 min under ISO 1133-1:2022, is converted into thin-gauge blown film for retail bags and produce bags on 75 mm grooved-barrier extruders with 25:1 L/D screws and Maddock mixing sections. The axial barrel profile is typically set at 170/180/190/200/205 °C from feed to die, with melt temperature at the die maintained between 190 °C and 210 °C. The spiral mandrel die gap is 1.8 mm to 2.2 mm, and the blow-up ratio is held at 3.0:1 to 4.5:1. Frost line height is set at 6 to 8 die diameters; excursion beyond 8 die diameters produces high-stalk bubble instability and gauge variation exceeding ±5%. The hopper blend is 2.0 wt% white LDPE-based masterbatch and 0.8 wt% slip/antiblock masterbatch containing 20 wt% synthetic silica, dosed by separate gravimetric feeders at the throat. Extruder backpressure is controlled within 250 bar to 350 bar, with output rates from 80 kg/h to 120 kg/h. Dart drop impact measured under ASTM D1709-16A Method B and Elmendorf tear measured under ASTM D1922-15 shift with blow-up ratio; above 4.5:1 machine-direction tear declines, but the exact transition for Y10050F is line-specific and requires converter-side verification. Food-contact compliance is limited to olefin polymers under FDA 21 CFR 177.1520(c), and EU conversion requires overall migration testing under EU Regulation 10/2011 Annex I Table 2 at the 10 mg/dm² limit. Finished converter articles are produce bags and retail carrier bags in 15 µm to 25 µm thickness.

Why Does Core Layer Modulus Dominate Seal Initiation in Coextruded Cereal Liners?

In a three-layer coextruded HDPE/LLDPE cereal liner, Y10050F is fed into the core extruder at 70 wt% of the core layer with 30 wt% C4-LLDPE at 0.918 g/cm³ density and 1.0 g/10 min melt index to reduce core viscosity. The core extruder is a 65 mm barrier screw with 30:1 L/D, and the skin-layer extruders are 45 mm smooth-bore screws with 24:1 L/D; total layer distribution is controlled at 20/60/20 and finished film thickness is 28 µm to 35 µm. Core melt temperature is 195 °C to 215 °C, die gap is 1.5 mm, and vertical form-fill-seal line speed is 60 m/min to 90 m/min. Seal initiation temperature is measured by ASTM F88/F88M-21; raising core Y10050F content above 75 wt% increases seal initiation temperature by 3 °C to 5 °C relative to 70 wt%, narrowing the sealing window on high-speed vertical form-fill-seal equipment. Dart drop impact under ASTM D1709-16A Method B is monitored because excessive core stiffness reduces energy absorption at 30 µm; exact published data for Y10050F in this coextruded configuration is limited, and line trials are required. US compliance is under FDA 21 CFR 177.1520 for polyolefin contact with food; EU compliance requires EU Regulation 10/2011 Annex I and Annex II review of all masterbatch additives, with migration testing under Annex III and Annex V. The end product is dry breakfast cereal liners and confectionery liner bags.

Extrusion coating lines running Y10050F apply a 12 g/m² to 25 g/m² coating onto corona-treated paperboard at melt temperatures between 205 °C and 230 °C and line speeds from 150 m/min to 300 m/min. The extruder is a 105 mm barrier screw with 28:1 L/D and a T-slot coat-hanger die; air gap is held at 150 mm to 250 mm. Reducing air gap below 150 mm controls neck-in but limits melt oxidation and lowers adhesion; increasing air gap above 250 mm produces draw resonance at high line speed and coating thickness variation above ±1.5 g/m². Where primerless adhesion to paperboard is required, a 90:10 weight blend of Y10050F and LDPE coating resin with melt index 7.0 g/10 min is metered at the hopper; peel adhesion is verified by ASTM D1876-08 T-peel at 200 mm/min. Compliance includes FDA 21 CFR 177.1520 for the polyolefin coating and FDA 21 CFR 176.170 for paper and paperboard in contact with aqueous and fatty foods, plus EU Regulation 1935/2004/EC and EU Regulation 10/2011 for the plastic coating layer. Finished converter articles are frozen food cartons, beverage carrier boxes, and industrial paper sacks with moisture-barrier coating.

High-Draw Monofilament Orientation and Fibrillation Resistance in Y10050F Tapes

In flat-die extrusion of Y10050F for woven-sack tapes, a 90 mm single-screw extruder runs at 210 °C to 230 °C, with a flat die gap of 0.8 mm to 1.2 mm and water-bath quenching at 35 °C to 40 °C. The quenched sheet is slit into 2.5 mm to 5.0 mm tapes and hot-air drawn at a draw ratio of 1:6 to 1:8 in an oven at 110 °C to 120 °C. A 2.5 wt% UV stabilizer masterbatch with hindered amine light stabilizer is added for outdoor exposure; 3.0 wt% calcium carbonate masterbatch is used where controlled fibrillation is required for soft woven fabrics. Drawing above 1:8 produces lateral fibrillation and increases tensile strength batch-to-batch variability beyond 5%. Tensile properties are measured under ASTM D638-14 at 500 mm/min crosshead speed; post-draw relaxation is set at 4% to 6% to stabilize tape denier, and denier variation is controlled within ±3%. Food-contact woven sacks require FDA 21 CFR 177.1520 and EU Regulation 10/2011; non-food industrial sacks fall under REACH 1907/2006 Annex XVII restrictions on lead and cadmium pigments. End products are woven sacks for grain, animal feed, cement, and construction waste.

When Post-Consumer Recyclate Is Blended with Y10050F for Non-Food Waste Liners

Post-consumer recycled HDPE (PCR) is blended with Y10050F at an 80:20 virgin-to-PCR weight ratio for refuse sacks in 50 µm to 70 µm thickness. The PCR fraction is pre-dried at 80 °C for 4 hours at dew point -30 °C and melt-filtered through a 100-mesh (150 µm) screen changer. The blend is processed on a grooved-barrier extruder at 190 °C to 210 °C; melt pressure is controlled at 330 bar to 380 bar, and output is held at 100 kg/h to 150 kg/h. At PCR addition above 20 wt%, gel count increases and bubble stability deteriorates; dart drop regression for this specific Y10050F/PCR blend is published only as converter line-trial data rather than standardized grade-sheet values. Non-food compliance is covered by REACH Article 3 and Annex XVII, and EU 2019/904 for reduced plastic bag consumption; FDA 21 CFR 177.1520 is not applicable unless the PCR feedstock meets food-contact recycled plastic requirements, which is not typical for post-consumer waste. End product is non-food refuse sacks and municipal waste bags.

Extrusion Coating of Woven Polypropylene Fabric Produces a Moisture Barrier

For lamination of woven polypropylene fabric used in FIBC and chemical packaging, Y10050F is extrusion-coated at 15 g/m² to 30 g/m² onto the fabric surface at 220 °C to 240 °C. Adhesion to the woven PP surface is improved by flame treatment or a chlorinated polyolefin primer; coating adhesion is verified by ASTM D3359-17 cross-cut rating of 3B or higher. Chill-roll temperature is set at 15 °C to 20 °C to control flatness and crystallinity. A 5.0 wt% titanium dioxide masterbatch is added for opacity, and a 0.5 wt% processing aid stabilizes the melt curtain; coating weight variation is controlled within ±1.5 g/m². Industrial chemical sacks require UN certification under 13H2 or 13H4 packaging groups with drop and stacking tests under ADR/RID; finished-article restrictions under RoHS 2011/65/EU Annex II and REACH apply when the coated fabric enters the European market. End product is FIBC outer shells, chemical packaging, and tarpaulin laminates.