Precision Raw Materials For High-Speed Cup Bottom Production
Discover our specialized PE coated bottom rolls, cup body rolls, and ultra-high bulk ivory paperboards developed to optimize thermo-sealing efficiency and mechanical stability in high-output rotary cup forming lines.
Bottom Roll Single Double PE Coated Paper Paper Cup
Paper Cup Raw Material Roll Manufacturer PE Coated Paper Cup Rolls
200 to 350 gsm Ultra High Bulk Food Grade Coated Paper GCU Packging Paperboard
PE coated paper cup fan for coffee cup Factory direct sale Raw Material
The Critical Role of PE Coated Paper in Cup Bottom Production
In modern disposable container manufacturing, the structural integrity and liquid-barrier capability of a paper cup fundamentally depend on the quality of the cup bottom production. While the cup wall (formed by paper cup fans) provides surface area for branding and structural grasp, the bottom disc serves as the central stress-bearing anchor. It must resist static hydrostatic pressure, dynamic thermal shocks from boiling liquids, and condensation moisture from chilled beverages without softening, delaminating, or micro-leaking.
Polyethylene (PE) coated paperboard, specifically engineered as paper cup bottom rolls, undergoes high-precision extrusion coating where molten food-grade low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE) is uniformly laminated onto virgin wood pulp base paper. In the bottom punch-and-curl station of automated high-speed cup-making machines running at speeds exceeding 150 to 300 pieces per minute, this specialized paper undergoes high-velocity circular blanking, downward pre-folding, deep insertion into the cup cylinder, and complex thermo-mechanical knurling. The heat-sealable PE layer melts under controlled thermal tooling (between 180°C and 260°C) and bonds seamlessly with the internal coating of the cup wall under intense mechanical crimping pressure, forming a hermetic liquid-tight circumferential lock.
High Stiffness & Caliper Uniformity
Bottom reels require superior cross-directional (CD) stiffness and isotropic fiber distribution. This prevents edge burring and dimensional distortion during high-velocity hydraulic or mechanical blanking.
Superior Thermal Sealing Kinetics
The extrusion PE coating features a balanced melt flow index (MFI) that responds instantaneously to ultrasonic or hot-air sealing heaters, guaranteeing bubble-free continuous fused welds along the lower rim.
Moisture Barrier & Anti-Wicking
High hydrophobicity prevents side-edge penetration and water wicking through raw fiber margins, critical for double-PE iced drink cups and prolonged liquid holding in commercial catering operations.
Single PE vs. Double PE Bottom Roll: Deep Application Engineering
Selecting the correct coating configuration for PE coated paper rolls is essential for operational economics and final product safety. For standard hot drinks (such as espresso, Americano, hot tea, and instant soups), a Single PE coated bottom paper is customary. The PE layer faces the interior of the vessel to contain the fluid, while the untreated external fiber matrix contacts the heated bottom knurling tool directly. The absence of an outer plastic layer prevents tooling stickiness and plastic burn at elevated forming temperatures.
Conversely, for cold beverage containers, carbonated soda cups, frozen yogurt containers, and ice cream tubs, Double PE coated paperboard is non-negotiable for both the cup fan and cup bottom. As cold contents cause atmospheric vapor to condense on the exterior walls, an unshielded outer paperboard surface would absorb water droplets, leading to structural softening, fiber degradation, and bottom rim collapse. The dual-side micro-layer of PE acts as a double barrier, sealing both internal beverage liquids and external ambient humidity.
| Property / Parameter | Hot Beverage Bottom Reel | Cold Beverage & Ice Cream Bottom | Heavy-Duty Food Bowl Bottom | Testing Standard |
|---|---|---|---|---|
| Base Paper Weight | 160 – 250 g/m² | 180 – 280 g/m² | 260 – 350 g/m² | ISO 536 / GB/T 451.2 |
| PE Coating Layer | 12 – 18 g/m² (Single PE) | 15 + 15 g/m² (Double PE) | 18 – 22 g/m² (Single/Double PE) | ISO 3801 / ASTM D3776 |
| Bursting Strength | ≥ 300 kPa | ≥ 380 kPa | ≥ 520 kPa | ISO 2758 / TAPPI T403 |
| Moisture Content | 6.0% ± 1.0% | 6.5% ± 1.0% | 6.0% ± 1.0% | ISO 287 / TAPPI T412 |
| Slitting Width Tolerance | ± 0.5 mm | ± 0.5 mm | ± 0.5 mm | Laser Micrometer Calibration |
| Cobb Value (60s water) | ≤ 28 g/m² | ≤ 18 g/m² | ≤ 20 g/m² | ISO 535 / TAPPI T441 |
| Heat Seal Temperature | 180°C – 230°C | 190°C – 250°C | 210°C – 270°C | Rotary Sealer Test Jig |
Nanning Paperjoy Paper Industry Co., Ltd.
Established in 2006, Paperjoy is a premier global manufacturer dedicated to the research, development, and mass production of premium raw materials for paper cups, food containers, and packaging boxes.
Nanning Paperjoy Paper Industry Co., Ltd. (“Paperjoy”) operates with over 200 dedicated employees across an expansive 15,000ã¡ modern facility. As a specialized manufacturer of paper cup raw materials, our core portfolio encompasses PE coated paper rolls, paper cup fans, cup bottom reels, PE coated paper sheets, kraft paper rolls, and C1S ivory board.
Our factory is strategically located at the heart of the Nanning City Economic Development Zone, adjacent to the Beibu Gulf maritime shipping hub and Qinzhou Port in Southern China. This advantageous position allows rapid transit times for sea freight worldwide. Our 200 well-trained technical staff are committed to customer success, adhering strictly to our corporate business philosophy of “Honesty, Mutual Benefit, and Win-Win Cooperation”.
Corporate Milestones
International Certifications & Regulatory Compliance
PaperJoy’s quality assurance system applies rigorously to every batch of base paper, polymer resin, and slitting process. Every roll meets or exceeds mandatory global food-contact safety standards.
ISO 9001:2015
FSC-COC Certification
BPA, PFAS Free (SGS)
REACH & TPCH
FDA 21 CFR 176.170
CNAS Accredited
Precision Machinery & One-Stop Conversion Lines
From virgin raw pulp lamination to high-speed micro-slitting, our facility operates over 45 units of advanced machinery, delivering complete one-stop solutions for PE coating, flexographic printing, die-cutting, and slit bottom reels.
1. Automatic Extrusion Laminating Lines
Three heavy-duty extrusion coating lines producing single & double PE coated paper rolls with automated corona discharge and real-time thickness sensors.
2. Six-Color High-Speed Flexo Printing
Three multi-color flexographic printing machines utilizing food-grade, water-based non-toxic inks for vibrant, high-definition paper cup fan graphics.
3. High-Speed Die-Cutting Machines
Eight computerized die-cutting stations executing up to 280 strokes per minute, producing clean-edged cup blanks without burrs or structural micro-cracks.
4. Precision Cup Bottom Slitters
Dedicated high-speed slitting and rewinding machinery creating uniform, tightly wound paper cup bottom rolls with slit width accuracy within ±0.5mm.
5. Rotary Paperboard Sheet Cutters
High-precision cross-cutting systems customized for producing dimensionally exact PE coated paper sheets for food packaging boxes and offset printing.
6. Automatic Waste Stripping Units
Eleven specialized blank clearing and finishing units ensuring pristine edge cleanliness and zero cardboard debris before export packaging.
Operational Workflow & Production Environments
16-Step Quality Control & Laboratory Inspection
Our in-house analytical lab performs continuous inline monitoring and offline batch verification covering GSM, coating adhesion, tensile strength, edge wicking, and bursting resistance.
PaperJoy Global Service & Strategic Supply Chain
We maintain deep strategic partnerships with world-renowned base paper mills including Sun Paper, APP, Stora Enso, Yibin Paper, and FiveStar Paper, securing steady supplies of premier wood pulp boards year-round.
Customized Material Specifications
We supply custom-tailored paperboard raw materials matching any required basis weight (150-380 gsm), PE coating thickness (10-25 gsm), roll width, and core diameter.
Free Quotations & Fast Sampling
Experience our paperboard quality directly on your own cup forming machinery. We provide complimentary sample reels and die-cut fans for validation prior to bulk contracting.
Export Logistics & Fast Dispatch
Standard mass production orders are fulfilled within 7 to 15 working days, protected by multi-layer waterproof stretch film, rugged kraft wraps, and heavy-duty wooden fumigated pallets.
Frequently Asked Questions on Cup Bottom Paper
Expert insights to help manufacturing plant managers and purchasing directors optimize raw material selection for high-yield paper cup production.
Q1: How does cup bottom paper GSM influence cup forming machine speed?
The basis weight (GSM) of the bottom roll directly determines the disc stiffness and the force needed to punch and knurl the bottom rim. If the base paper is too thin (<150 gsm), high-speed blanking knives can produce uneven edges and crease distortion. If the paper is overly heavy (>320 gsm) on small 4oz-8oz cups, the knurling heaters may fail to transfer sufficient heat through the thick fiber within the millisecond cycle of high-speed machines, resulting in incomplete seal fusion. Selecting the recommended GSM matching your cup height and bottom diameter ensures continuous, non-stop operation at 200+ cups/min.
Q2: Why is slitting width accuracy vital for paper cup bottom rolls?
Cup bottom paper is fed automatically from the reel into the machine’s bottom punching station. If the roll width deviates by more than ±0.5mm, the punched circular blank will be off-center or have mismatched rim heights during downward folding. This causes asymmetrical knurling depth around the circumference, creating micro-gaps where coffee or water can seep through. Paperjoy employs computerized laser-guided slitting heads to maintain tight dimensional tolerances (±0.5mm) across entire 10,000-meter reels.
Q3: Can PE coated cup bottom paper be stored long-term without degrading?
When stored in a clean, ventilated, and moisture-controlled warehouse (relative humidity 40%-60%, temperature 18°C-26°C) within original multi-layer packaging, PE coated paper retains optimum fiber elasticity, surface tension, and heat-seal strength for over 24 months. Proper wrapping prevents ambient moisture absorption, which could otherwise alter the paper’s dialectric and thermal transfer properties during cup bottom forming.
Comprehensive Raw Material Solutions for Paper Cup Manufacturing
Explore our complete selection of PE coated cup bottom reels, printed and blank cup fans, food-grade ivory paperboards, and eco-friendly kraft rolls engineered for global paper cup and packaging producers.
Bottom Roll Single Double PE Coated Paper Paper Cup
Paper Cup Raw Material Roll Manufacturer PE Coated Paper Cup Rolls
200 to 350 gsm Ultra High Bulk Food Grade Coated Paper GCU Packging Paperboard
PE coated paper cup fan for coffee cup Factory direct sale Raw Material
Golden Paper Cup Fan Customized Logo Printing Food Grade Disposable Paper Cup Raw Materials for Making Paper Cups
PE Coated Kraft Paper Cup Fan For Hot and Cold Drinks Coffee/Milk/Tea Cups
FBB Board Paper Price Coated C1S/C2S Folding Box Board GC1/GC2 Paper Board Roll
