In an era where digital transformation dominates headlines, the enduring relevance of high-quality paper remains undeniable. From legal contracts and financial reports to academic theses and executive presentations, the physical document continues to command authority, credibility, and trust. Among the myriad options available worldwide, one product has risen above the noise—not through aggressive marketing, but through relentless engineering excellence, cultural authenticity, and uncompromising performance: Deli’s 70g/m² A4 copy paper, a benchmark in professional-grade office supplies.

What sets this paper apart is not merely its weight or size—it is the synthesis of ancient Chinese craftsmanship, cutting-edge industrial automation, and scientifically validated material science. With cumulative sales exceeding 14.86 million units (as of April 1, 2024), this product has earned its place as the de facto standard across multinational corporations, government institutions, and elite educational bodies globally. Its dominance is not accidental; it is the result of over four decades of dedicated innovation rooted in China’s profound papermaking heritage—the world’s oldest continuous paper tradition.

The Legacy Behind Every Sheet: China’s 2,000-Year Papermaking Heritage

Paper was invented in China during the Han Dynasty (circa 105 CE) by Cai Lun—a breakthrough that revolutionized communication, record-keeping, and knowledge dissemination across civilizations. Deli honors this legacy not as a historical footnote, but as a living philosophy. The brand’s “Cultural Inheritance” initiative explicitly links modern production to classical techniques:

• “Jia Gu” (Oracle Bone Script): Symbolizing the earliest written records, Deli draws inspiration from the precision and durability required for inscribing on bone and tortoise shell—translating into today’s rigorous quality control protocols.
• “Bamboo Slips”: Before paper, bamboo strips were bound into scrolls for official documentation. Deli’s commitment to uniform fiber alignment and edge integrity echoes the meticulous preparation required for legible, durable bamboo texts.
• “Lun Paper” (Lun Zhi): Named after the legendary papermaker Zhang Heng’s disciple, this refers to early refined paper made from mulberry bark and hemp. Deli replicates this purity using premium long-fiber wood pulp—ensuring strength without brittleness.
• “Mechanized Production”: Since 1978, Deli has pioneered the integration of automation with traditional papermaking wisdom. The transition from manual vat dipping to fully integrated production lines represents not a departure from heritage, but its evolution into the digital age.

This cultural grounding informs every decision—from raw material sourcing to final calibration—ensuring that each ream carries the weight of history while meeting the exacting demands of contemporary workflows.

Engineering Excellence: Five Pillars of Unmatched Performance

Deli’s 70g/m² A4 paper is engineered around five non-negotiable performance pillars—each rigorously tested and validated through real-world application:

1. Surface Perfection: Flatness & Weight Consistency

Every sheet undergoes optical flatness inspection and micro-weighing at multiple points. The result? A surface deviation of less than 0.03mm across the entire sheet, with weight tolerance held to ±0.5g/m². This eliminates curling, jamming, and misfeeds—even under high-volume printing conditions. When documents must convey professionalism, visual imperfections are unacceptable. Deli guarantees a pristine, neutral-white base that enhances ink adhesion and color fidelity.

2. Tactile Integrity: Smoothness Without Compromise

With a smoothness rating of 99 μm (Sheffield units), the paper delivers a luxurious glide under pen or finger—yet retains sufficient tooth for reliable toner grip. Unlike cheaper alternatives that feel slick or waxy, Deli’s surface is engineered for functional elegance: it resists smudging during handling while preventing offset during duplex printing. Users report a “confident touch”—a subtle but critical psychological cue that reinforces trust in the document’s legitimacy.

3. Structural Resilience: Long-Fiber Wood Pulp & Superior Absorbency

Crafted from 100% virgin long-fiber softwood pulp (primarily spruce and pine), the paper achieves a remarkable 25.9 g/m² water absorption rate—a metric directly correlated with print sharpness and bleed resistance. Short-fiber papers absorb ink too quickly, causing feathering; overly dense papers repel ink, leading to poor toner fusion. Deli strikes the perfect equilibrium: ink penetrates just enough to anchor firmly, yet dries instantly without smearing. This makes it ideal for both laser and inkjet environments—including high-speed production printers operating at 100+ ppm.

4. Duplex Reliability: Zero Jamming, Zero Carding

Double-sided printing is no longer optional—it’s essential for sustainability and efficiency. Deli’s proprietary AKD (Alkyl Ketene Dimer) mid-layer coating technology creates a hydrophobic barrier that prevents moisture migration between layers. Combined with precise calendering, this yields a 94.2% non-transparency index—meaning text on the reverse side does not ghost through, even with dark ink densities. The result? Flawless two-sided output, whether for contracts, manuals, or presentation decks. Users consistently report zero paper jams across mixed-device fleets—a testament to dimensional stability and static control.

5. Writing Clarity: Ink Flow Without Feathering

For handwritten annotations, legal signatures, or field notes, writing performance is paramount. Deli’s surface chemistry ensures consistent ink flow from ballpoint, gel, and fountain pens. Independent lab tests confirm <0.1mm lateral spread for standard blue ink—far below industry averages. The paper absorbs ink rapidly but uniformly, eliminating the “halo effect” common in lower-grade stocks. This isn’t just about aesthetics; it’s about legal defensibility and readability over time.

Industrial Rigor: Automation Meets Human Oversight

Behind every ream lies a state-of-the-art manufacturing ecosystem. Deli operates three flagship production facilities equipped with:

• Valmet Mesto Paper Machines: These intelligent lines monitor basis weight, moisture, and caliper in real-time, adjusting parameters 1,000 times per second. Fiber dispersion is optimized to eliminate streaks and spots—critical for high-resolution imaging.
• W&H Fully Automated Cutting Lines: Each sheet is trimmed with micron-level precision, ensuring perfect registration for binding, folding, and punching. Edge burrs—common causes of printer jams—are eliminated at source.
• DCS/QCS Online Quality Control Systems: Integrated sensors perform 200+ measurements per minute across the web. Any deviation triggers automatic rejection and process recalibration. This closed-loop system reduces defect rates to <0.001%, a standard unmatched by most competitors.

Crucially, automation does not replace human expertise. Deli’s “Automation Laboratory” employs senior paper technologists who validate machine outputs against tactile and functional benchmarks—ensuring that digital metrics align with real-world usability.

Precision Specification: Designed for Global Compatibility

Deli’s 70g/m² A4 paper adheres strictly to ISO 216 standards (210 × 297 mm), with tolerances of ±0.5 mm—compatible with all major printer brands (Canon, HP, Xerox, Ricoh, Brother) and binding systems (GBC, Fellowes, Tamer). Key specifications include:

• Basis Weight: 70.0 ± 0.5 g/m²
• Thickness: 99 ± 3 μm
• Brightness: 104 ± 1 ISO
• Opacity: 94.2% (measured at 70g/m²)
• Smoothness: 99 μm (Sheffield)
• Moisture Content: 4.8 ± 0.3%
• pH Value: 7.2 ± 0.3 (neutral, acid-free for archival stability)

Each carton contains 500 sheets per ream, packaged in moisture-resistant kraft sleeves with tamper-evident seals. The packaging itself is designed for stack stability and warehouse efficiency—minimizing damage during storage and transport.

Why Professionals Choose Deli: Beyond Specifications

The true differentiator lies in predictability. In high-stakes environments—where a misprinted contract, a faded signature, or a jammed printer can cost hours of productivity—reliability is non-negotiable. Deli’s paper delivers consistency across batches, seasons, and geographies. Whether printed in Singapore’s humidity or Berlin’s dry winters, performance remains unchanged thanks to climate-controlled storage and adaptive coating formulations.

Moreover, Deli’s commitment to sustainability is embedded in its process:

• 100% FSC-certified virgin pulp
• Closed-loop water recycling (98% reuse rate)
• Zero elemental chlorine bleaching (ECF process)
• Carbon-neutral manufacturing via renewable energy offsets

This isn’t greenwashing—it’s operational integrity. Global procurement teams increasingly mandate such credentials, and Deli meets them without sacrificing performance.

The Quiet Authority of a Perfect Sheet

There is power in silence—the unspoken confidence conveyed when a document lands on a desk: crisp edges, clean margins, text that doesn’t blur at the corners. Deli’s 70g/m² A4 paper doesn’t shout; it asserts. It transforms routine correspondence into statements of competence. It turns internal memos into strategic artifacts. It ensures that every signature, every chart, every footnote carries the weight it deserves.

In a world saturated with digital noise, the physical document remains a sanctuary of clarity. And within that sanctuary, Deli stands as the guardian of precision—honoring tradition while embracing tomorrow’s demands. When excellence is measured not in features, but in flawless execution, there is only one choice.

This is not just paper.

This is proof.