Primary Bottom Roll & Cupstock Solutions
Optimized roll and fan raw materials crafted specifically for high-speed automated thermo-mechanical paper cup bottom knurling, ultrasonic bonding, and deep leak-proof sealing.
Industrial Dynamics & Engineering Science of Cup Bottom Kraft Paper
Understanding the mechanical stress, extrusion lamination integrity, and high-speed rotary punching behavior of PE coated kraft paper in modern disposable cup manufacturing lines.
The Critical Role of Bottom Stock in Cup Structural Rigidity
In modern high-speed disposable drinkware engineering, the bottom of the cup represents the structural epicenter of mechanical integrity. While the cup fan forms the circumferential cylinder, the PE coated kraft paper for cup bottom production sustains multi-directional hydrostatic head pressure, thermal expansion from boiling liquids, and the crushing force of hand grips.
Cup bottoms must undergo high-speed disk punching, continuous circular flanging, and precision knurling at rates between 180 and 320 cups per minute. If the base paperboard lacks sufficient cross-directional tensile strength or exhibits uneven extrusion polymer anchoring, severe side-wall delamination and micro-fissure leakage will inevitably occur under thermal shock.
Barrier Extrusion Chemistry: LDPE, HDPE & Anti-Wicking
Standard uncoated kraft paper absorbs aqueous solutions through capillary action along the unbleached sulfate cellulose fibers. To eliminate edge wicking and internal liquid penetration, Paperjoy applies food-grade virgin low-density polyethylene (LDPE) or modified polypropylene via high-temperature extrusion coating (280°C – 315°C).
The molten polymer is pressed directly onto corona-treated kraft board through high-pressure chill rolls, forming a pinhole-free barrier of 12gsm to 24gsm thickness. This hermetic layer delivers superior heat-seal responsiveness during bottom heater activation, fusing seamlessly with the internal polyethylene layer of the cup fan blank.
Parametric Comparison: Cup Bottom Reel vs. Cup Wall Stock
| Performance Indicator | Cup Bottom Kraft Reel (Specialized) | Cup Wall Fan Paperstock | Industrial Quality Objective |
|---|---|---|---|
| Base Grammage Range | 140 gsm – 230 gsm Virgin Kraft | 170 gsm – 350 gsm Cupstock Board | High flexibility with tight bottom knurl tight-wrap |
| Extrusion Coating | Single PE (15-20g) or Double PE (15+15g) | Single PE (Hot Drinks) / Double PE (Cold Drinks) | 100% moisture vapor barrier & heat-fusible seal |
| Cross-Direction (CD) Ring Crush | ≥ 8.5 N·m/g (High elasticity) | ≥ 7.2 N·m/g (Form retention focus) | Resists bottom disk collapse during rapid crimping |
| Slitting Edge Precision | Tolerance ± 0.20 mm (Mirror reel wind) | Die-cut arc edge tolerance ± 0.35 mm | Jam-free automatic feeding into high-speed cup dies |
| Cobb 60 (Water Absorption) | ≤ 6 g/m² (Coated Side), Anti-wick treated | ≤ 8 g/m² (Internal food-contact side) | Zero rim wicking over 4 hours at 95°C continuous holding |
Global Trends: The Rise of Natural Kraft Aesthetics & Bio-Barriers
The consumer packaging sector is undergoing a profound structural pivot away from bleached virgin white cups toward rustic, unbleached brown kraft paper cups. Consumers perceive unbleached kraft as authentic, organic, and ecologically responsible. In hot coffee chains, artisan beverage franchises, and quick-service restaurant (QSR) corporations worldwide, kraft cup stock demand is recording an annual growth rate above 8.4%.
Simultaneously, environmental regulations across the European Union (SUPD Directive) and North American municipal standards are incentivizing the research and deployment of aqueous dispersion coatings, bio-PBS, and PLA coatings. Paperjoy sits at the cutting edge of these transitions, delivering both traditional high-performance PE barrier polymers and biodegradable resin laminations designed specifically for bottom-forming mechanics.
Precision Slitting Technology & Bottom Feeding Machine Uptime
A primary cause of manufacturing downtime in paper cup factories is bottom reel width fluctuation, ragged cut edges, or core ovalization. When a bottom reel feeds through automatic servo-driven indexers, any burr or edge roughness causes feed slippage, leading to misaligned circular punching.
Paperjoy employs computer-calibrated high-speed rotary slitting systems with digital web-guiding sensors. This achieves mirror-smooth edge finishes with strict slit width tolerances (±0.2mm), uniform winding tension, and heavy-duty moisture-sealed core packing. As a direct result, converting factories run at peak machinery uptime without web snapping or bottom-cup forming blockages.
About Nanning Paperjoy Paper Industry Co., Ltd.
Nanning Paperjoy Paper Industry Co., Ltd. (“Paperjoy”) was established in 2006, with 200 employees and covers over 15,000㎡. Paperjoy is a professional manufacturer of raw materials for paper cup and packaging box, especially the PE coated paper roll, paper cup fan, cup bottom reel and C1S ivory board. We are specializing in producing different kinds of PE coated paper raw materials. The annual production capacity is 60,000 tons.
Our factory is ideally located at the heart of Nanning city economic zone, which is very near to Qinzhou port, Beibu Gulf at the South of China. Our 200 well-trained and technically sound staff are motivated towards accomplishing a common goal of customer satisfaction and devoted to achieving the “Honesty, Mutual benefit, Win-Win cooperation” business philosophy.
Paperjoy factory is located very near to several famous paper mill brands. Stora Enso, Sunpaper, APP, Yibin paper, and FiveStar paper etc… are our regular base paper suppliers. Besides, we have built a comprehensive strategic partnership with SunPaper Groups, reliable paper quality and steady delivery time are guaranteed. With complete devices and equipment, we are capable of providing one-stop service of PE coated, printing, die cutting, cleaning off and slitting.
Development History
From a focused extrusion pioneer into an international heavyweight supplying raw material to over 2,000 factories across 60+ countries.
Set up in 2006, engaged in paper cup paper PE coating industry. Paperjoy, means good luck and happiness.
Developing B2B overseas market. Expand the international market, targeting Asia, Africa, Europe, North America, etc.
Brand-new production line commissioned, overall production capacity doubled to be 60,000 tons/year.
Our products have been continuously supplied to more than 2,000 factories and exported to 60+ global sovereign nations.
Rigorous Certification System
PaperJoy’s quality assurance system applies to all of our processes and products. Our quality management program ensures that every product delivered meets or exceeds the quality standards required by our global customers.
Core Factory Advantages & Raw Material Integrity
Direct partnerships with the world’s premier timber and pulp groups guarantee uninterrupted raw material purity, certified food-safe chemical integrity, and scalable lead times.
Corporate Vision
Bring health & environmental protection to all over the world through sustainable, food-safe paperboard innovation.
Global Mission
To be the best global supplier of paper cup raw materials, delivering unmatched consistency and technical support.
Team Culture
To be the happy, collaborative home for all our dedicated technical staff, nurturing craftsmanship and engineering leadership.
PaperJoy Global Service Architecture
Comprehensive pre-sales formulation, custom specifications, free sampling protocols, and uninterrupted technical support across 6 global continents.
Customized Products
We provide customers with customized paperboard raw material products according to their needs and requirements to meet different cup sizes, high-speed machines, and demanding application scenarios.
Diverse Products
We offer a full spectrum of paperboard raw materials, including PE coated Paper Roll, PE Coated Paper Sheet, Paper Cup Fan, C1S Ivory Board, and Kraft Paper Roll for cups and bowls.
Free Quotations & Samples
We provide free test samples and rapid quotations to ensure that our global partners can verify tensile strength, thermal knurl bonding, and waterproof edge-wicking performance prior to volume ordering.
Fast Delivery
Backed by efficient production planning and smart inventory near Qinzhou Port, standard and customized bottom stock orders can be finalized and shipped in accelerated turnaround cycles (7-15 working days).
Technical Consulting
Our experienced mechanical and chemical engineering team assists clients with GSM recommendations, die setup, temperature balancing for bottom sealing, and tooling calibrations.
Professional Technical Support
Round-the-clock technical troubleshooting, moisture-retention storage advisories, and after-sales support ensure smooth converting operations and zero defect rates on your plant floor.
Advanced Industrial Equipment Fleet
State-of-the-art automatic extrusion lines, high-definition flexo printing presses, high-speed rotary die-cutters, and precision bottom-reel slitters operating across 15,000㎡.
1. Three Extrusion Laminating Machines
Used to produce PE coated paper rolls. Auto high-speed production line ensuring uniform coating thickness and rapid delivery execution.
2. Three Flexo-Printing Machines
Dedicated flexo presses for printing paper cup fans in roll. Six-color high-speed flexo printing, running stable, sharp registration, and eco-friendly food ink.
3. Eight Die-Cutting Machines
Fully automated high-speed die-cutters for cup fans and blanks. Capable of throughput exceeding 280 sheets/min max with clean, burr-free edges.
4. High-Speed Bottom Slitting Machine
Specialized slitting equipment engineered to produce precision paper cup bottom rolls with clean cut boundaries, controlled tension, and customized slitting widths.
5. High-Speed Sheet Cutting Machine
Precision cross-cutting and sizing machinery engineered for high-accuracy production of PE coated paper sheets for food boxes and takeaway lunch containers.
6. Eleven Product Standard Clean-Off Units
Dedicated automatic cleaning and stripping machinery eliminating cutting waste generated by diverse paper cup fan specifications.
Personnel Operation Process & Quality Testing
Honors & Industry Recognition
Plastics Association Member Unit
Charitable Enterprise
Alibaba Certified Verified Gold Supplier
Four-Stage Inspection & Supply Chain Resilience
Guaranteeing zero bottom pinholes, precise reel width calibration, and swift maritime logistics to Europe, North America, Southeast Asia, and the Middle East.
Featured Raw Materials For Paper Cup & Food Packaging Production
Browse our core raw material lines: from specialized bottom reels and printed cup fans to ultra-high-bulk folding boxboard and premium single/double PE coated substrates.
Get Free Samples And Quotations For Cup Bottom Production!
Partner with Nanning Paperjoy Paper Industry Co., Ltd. for stable, high-tensile PE coated kraft paper bottom reels and complete paper cup raw material solutions. Boost your machine speeds and achieve 100% leak-proof rim integrity.