One type of heat-resistant paper and three types of heat-resistant papers A deep analysis of their protective properties and application scenarios
author: Eva
2025-10-16
I. Technical Definition and Material Comparison
1） Anti-Heat Sensitivity Paper
Core Function:
Primarily based on basic waterproof performance, it can resist minor moisture (such as water droplets or short-term humid environments), but is prone to failure in long-term immersion or high-humidity conditions.
Material Composition:
Base Paper: Ordinary wood pulp paper or recycled paper, with a weight of 50-70g/㎡ and a thickness of approximately 60-80μm.
Heat Sensitivity Coating: Contains a bisphenol A (BPA) coloration system (accounting for 15-20% of the coating weight), combined with calcium carbonate filler (40-50%) and polyvinyl alcohol adhesive (10-15%).
Protective Layer: Only coated with a simple acrylic resin layer (thickness 1-2μm), lacking oil and scratch resistance.
Adhesive: Water-based adhesive system, initial adhesion force ≤ 10N/25mm, suitable for flat surface labeling, but prone to detachment due to grease.
2） Anti-Heat Sensitivity Paper
Core Function:
Through three-layer protection of waterproof, oil-resistant, and scratch-resistant, it maintains stability in harsh environments. For example, exposed to 37℃, 50% RH conditions for 72 hours, the light density retention rate of the printed content is ≥ 90%.
Material Composition:
Base Paper: High-strength chemical wood pulp or synthetic paper (such as PP, PET), with a weight of 70-100g/㎡, a thickness of 80-120μm, and a tear resistance strength > 15N/15mm.
Heat Sensitivity Coating: Without BPA formulation (such as fluorane-based colorants), combined with nano-sized silica filler (30-40%) and polyurethane adhesive (20-30%), with a coloration speed ≤ 0.1 seconds per dot.
Protection System:
Isolation Layer: Contains latex (18-22 parts), PVA (50-60 parts), and crosslinking agent (10-20 parts), preventing grease from penetrating to the heat sensitivity layer.
Top Coating: Fluorocarbon resin (thickness 3-5μm), surface energy ≤ 15mN/m, waterproof rating up to IPX7 (30-minute 1-meter water immersion without penetration).
Adhesive: Hot melt adhesive system, initial adhesion force ≥ 14N/25mm, holding force > 10 hours, suitable for labeling in -20℃ to 70℃ environments.
II. Production Process and Performance Testing Standards
1） Anti-Heat Sensitivity Paper Production Process
Coating Process:
Single-layer scraper coating, coating speed 30-50 meters/minute, oven temperature 80-120℃, coating thickness controlled ±10%.
Testing Standards:
Waterproofness: GB/T 24987-2010 standard, no penetration on the surface after 30 minutes, but prone to delamination after long-term immersion (>2 hours).
Storage Period: ≤ 8 months at room temperature and protected from light, accelerated fading at high temperatures (>40℃) or in the presence of light.
2） Anti-Heat Sensitivity Paper Production Process
Coating Process:
Multi-layer composite coating (pre-coating → heat sensitivity layer → isolation layer → top coating), using micro-etch coating technology, coating thickness error ≤ ±5%, machine speed 15-25 meters/minute.
Key Technologies:
Top Coating Process: Fluorocarbon resin enhanced adhesion through plasma treatment, surface roughness Ra ≤ 0.2μm, pencil hardness ≥ 3H.
Drying Technology: Segmented hot air circulation oven (120℃ → 150℃ → 100℃), ensuring uniform coating curing and no pinhole defects.
Testing Standards:
Waterproofness: ISO 20653:2018 standard, IPX7 level waterproof (1-meter water depth 30 minutes without penetration).
Oil Resistance: ASTM D471 standard, after soaking in pressed peanut oil for 3 hours, light density retention rate ≥ 95%.
Scratch Resistance: Foggra wear tester (4.9N pressure, 100 times friction), surface wear amount ≤ 0.1μm. Supermarket retail: Price tags for common goods (such as stationery and daily necessities), with low costs (0.01 - 0.03 yuan per piece), but avoid contact with the fresh food section as it is exposed to moisture.
Logistics foundation: Ordinary express shipping labels, barcode readability ≥ 98% in a dry environment, but may become blurry in rainy weather.
Medical records: Outpatient registration forms, short retention period (≤ 6 months), suitable for temporary information recording.
III. Application Scenarios and Typical Cases
1） Application Scenario of Heat-sensitive Paper
Retail in Commercial Supermarkets: Price tags for common goods (such as stationery and daily necessities), with low cost (0.01 - 0.03 yuan per sheet), but need to avoid contact with the fresh produce section's moisture.
Logistics Foundation: Ordinary express delivery labels, with barcode readability ≥ 98% in dry environments, but prone to blurring in rainy weather.
Medical Records: Outpatient registration forms, with a short preservation period (≤ 6 months), suitable for temporary information recording.
2）Three-Defense Heat-sensitive Paper Application Scenario
Cold Chain Logistics:
Case: A meat enterprise used three-defense heat-sensitive paper labels (-20℃ labeling), after being processed by a heat shrink machine, stored at -18℃ for 6 months, with barcode scanning pass rate > 99%.
Technical Advantages: Low-temperature adhesive that can withstand the lowest labeling temperature of -5℃, resistant to condensation water penetration, ensuring complete information throughout the cold chain transportation.
Catering Industry:
Case: A chain restaurant adopted anti-oil labels (resistant to 120℃ edible oil splashing), used in the kitchen environment for 3 months, with printed content not smudged or fall off.
Technical Advantages： Low surface energy of fluorocarbon coating， grease contact angle > 110°， easy to clean and resistant to pollution.
Industrial Manufacturing：
Case： Automotive component labels passed salt spray tests (5% NaCl solution, 48 hours), without corrosion or fading, meeting ISO 9227 standards.
Technical Advantages： Isolation layer effectively blocks the penetration of metal processing liquid， protecting the heat-sensitive layer from chemical erosion.
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