The Differences in Requirements for Disposable Paper Cups Used for Cold and Hot Beverages
author: Iris
2025-12-24
I. Analysis of Differences in Material Selection
1.1 Differences in Raw Material Ratios of Paper Substrates
The core difference between disposable paper cups for cold and hot beverages begins with the fiber ratio and physical parameters of the paper substrate, which directly determine their basic performance in different temperature environments.
According to a 2023 survey of 42 paper cup manufacturers by the China Pulp and Paper Research Institute, hot beverage disposable paper cups require a softwood pulp to hardwood pulp ratio of 6:4 to 7:3 to ensure structural stability at high temperatures. Softwood pulp fibers are long (average length 2-4mm) and strong, counteracting the thermal expansion of fibers caused by high temperatures and preventing cup deformation and collapse; while ice beverage disposable paper cups, not needing to withstand high temperatures, have lower stiffness requirements, allowing the proportion of hardwood pulp to be increased to over 50%—hardwood pulp fibers are shorter (1-2mm), and although slightly weaker, they improve paper uniformity and smoothness, while also reducing raw material costs by 15%-20%.
In terms of physical parameters, both types of paper cup with lid comply with the QB/T 4032-2022 "Paper for disposable paper cups" standard, but there are significant differences in basis weight and thickness:
- Hot beverage disposable paper cups: High basis weight is needed to compensate for strength loss at high temperatures, typically using high-bulk or ultra-high-bulk paper with a basis weight of 210-330 g/m² and a thickness of 0.25-0.35 mm. For example, a certain chain coffee brand uses 280±10 g/m² paper for its hot beverage cups to ensure no softening or deformation when holding 95℃ hot water.
- Cold beverage disposable paper cups: The basis weight ranges from 170-250 g/m², with a thickness of 0.18-0.25 mm, focusing on balancing moisture resistance and processing adaptability. A certain milk tea brand uses base paper with a weight of 210±7 g/m² for its cold beverage cups, combined with a special coating to handle condensation.
It is important to note that QB/T 4032-2022 clearly stipulates that recycled fibers are prohibited in the base paper for disposable paper cups. It also requires a cross-direction basis weight difference of ≤4.0%, bulk density ≥1.35 cm³/g, D65 brightness ≤87.0%, and water absorption ≤40.0 g/m², ensuring food safety and material stability from the source.
1.2 Technical Principles of Raw Material Selection
The core principle for selecting raw materials for hot beverage disposable paper cups is heat resistance: bleached virgin pulp (softwood or hardwood) is required, with a low fiber thermal expansion coefficient, maintaining structural integrity at high temperatures of 80-95℃. Some high-end products also add 0.5%-1% heat stabilizers (such as modified calcium carbonate) to the pulp to further reduce the fiber degradation rate at high temperatures.
Cold beverage disposable paper cups focus on low-temperature brittleness resistance and moisture resistance: a certain brand of cold beverage cups uses 300 g/m² base paper, combined with a double-layer PE coating (inner layer 0.02mm for impermeability, outer layer 0.015mm for toughening). After -18℃ freezing tests, the cup body hardness retention rate reached 85%, and the leakage rate was less than 0.3%. In addition, the pulp for cold beverage cups may contain 1%-2% moisture-proof additives (such as paraffin emulsion) to reduce the penetration of condensation water into the paper.
With upgraded environmental requirements, GB/T 27590-2022 introduces the "bio-based content" indicator for the first time, requiring that the proportion of bio-based materials in biodegradable disposable paper cups be ≥50%. Currently, bio-based materials such as polylactic acid (PLA) have been applied to cold beverage cups, but because PLA has a glass transition temperature of only 60℃ and a melting point of 150-160℃, it cannot yet meet the heat resistance requirements of hot beverage cups, requiring further technological breakthroughs.
II. Differentiated Requirements for Structural Design
2.1 Differences in Cup Wall Thickness Design
Cup wall thickness design needs to precisely match the core requirements of different temperature scenarios: hot beverage cups prioritize heat insulation and high-temperature strength, while cold beverage cups prioritize moisture resistance and condensation protection.
Hot beverage disposable paper cups: The cup wall thickness typically reaches 0.3mm (1.5 times that of an ordinary paper cup with lid). This thickened structure achieves a dual function—first, reducing heat transfer and lowering the risk of scalding; second, compensating for the loss of paper strength at high temperatures. One brand of anti-scald paper cup adds a circular groove in the middle of the cup body, combined with a 3.5mm local thickening. When holding liquid at 100℃, the outer wall temperature remains ≤50℃ (the comfortable contact threshold for the human body) after 5 minutes.
Cold beverage disposable paper cups: Although the cup wall thickness may also reach 0.3mm, the design logic is different—the focus is on improving impermeability to cope with condensation erosion. One brand of cold beverage cup uses a double-layer PE coating process, increasing the cup wall thickness by 20% compared to ordinary disposable paper cups. After 6 hours of testing with 4℃ ice water, there was no softening of the outer layer.
In addition, the cup wall thickness needs to be adapted to the capacity. GB/T 27590-2022 stipulates that for nominal capacities ≤250mL, the stiffness of the cup body of high-quality products should be ≥3.00N; for 500mL, ≥3.60N; and for 1000mL, ≥3.80N, ensuring that disposable paper cups of different capacities remain stable during use.
2.2 Technical Requirements for Cup Bottom Reinforcement Design
The cup bottom is the core stress-bearing area of the paper cup, and the reinforcement design of the two types of disposable paper cups focuses on different aspects: hot beverage cups prevent thermal deformation, while cold beverage cups prevent moisture softening.
Hot beverage disposable paper cups: The connection between the cup bottom and the cup body uses "triple reinforcement"—first, the paper weight at the connection is 30% higher than that of the cup body; second, an arc-shaped transition structure is used to disperse stress; and third, anti-slip patterns are added to the cup bottom. One high-end hot beverage cup has a 50% thicker bottom. When holding 200g of food with sauce, there is no bottom indentation or leakage. Ice Drink disposable paper cups: Reinforced base for improved moisture resistance, with specific measures including:
The base paper weight is 30%-50% higher than the cup body (e.g., 250g/m² for the cup body, 320g/m² for the base);
The bottom coating thickness is increased to 35-40μm (conventional cup bottom coating is 25μm), forming a stronger waterproof barrier;
Some products use a "hollow cup base" design, with a downward concave center, reducing the contact area between condensed water and the supporting surface, improving stability.
The bottom coating thickness is increased to 35-40μm (conventional cup bottom coating is 25μm), forming a stronger waterproof barrier;
Some products use a "hollow cup base" design, with a downward concave center, reducing the contact area between condensed water and the supporting surface, improving stability.
2.3 Innovative Applications of Special Structural Designs
The special structural designs of the two types of disposable paper cups revolve around core pain points, specifically addressing usage problems caused by temperature differences.
Hot Drink Disposable Paper Cups:
- Double-walled design: The air insulation layer (3mm thick) between the inner and outer walls reduces the outer wall temperature by 12-15℃. A certain brand's double-walled paper cup extends the insulation time for 95℃ hot drinks to 4 hours, with the outer wall temperature only reaching 42℃.
- Rolled rim design: Using a 304 stainless steel mold and three-stage pressing, the rim thickness uniformity reaches 98%, and the mouth roundness deviation is ≤0.3mm. This prevents scalding and can withstand 8kg of vertical pressure without deformation (far exceeding the industry standard of 5kg).
Ice Drink Disposable Paper Cups:
- Corrugated cup wall design: By increasing the outer wall surface area, condensed water is dispersed, preventing slippage caused by water droplet accumulation. A certain brand's corrugated ice drink cup reduces condensed water residue by 60% compared to ordinary cups.
- Leak-proof lid adaptation: A 0.5mm raised sealing ring is added to the edge of the cup mouth. After engaging with the lid, there is no leakage even when inverted for 1 minute, making it suitable for scenarios involving shaking ice drinks.
III. Functional Differences in Coating Treatment
3.1 Principles of Coating Material Selection
The coating is the core guarantee for the waterproof and temperature resistance of disposable paper cups. The selection of coating materials for cold and hot beverage cups is essentially about matching the stability requirements of different temperature scenarios.
Hot beverage disposable paper cups: Mainstream use polyethylene (PE) coating because its melting point is 120-140℃ (higher than the boiling point of water at 100℃), ensuring it does not melt or release harmful substances at high temperatures. Specific requirements include:
- Melting point ≥ 120℃ (ordinary PE melting point is 110℃);
- Coating thickness 25-30μm (conventional cup coating is 15-20μm);
High-end products use "PE + PET double-layer coating" or "PE + aluminum foil interlayer" to further enhance heat resistance and insulation performance, suitable for hot beverages above 95℃.
Cold beverage disposable paper cups: The coating has undergone a technological evolution from "paraffin wax → PE":
- Early use of paraffin wax coating (melting point 52-68℃), but it melts when encountering liquids above 40℃, and has now been gradually phased out;
- Modern cold beverage cups use a double-layer PE coating: the inner layer is 0.02mm to prevent liquid penetration, and the outer layer is 0.015mm to improve the toughness of the cup body. Some products also add a 5-8μm hydrophilic siloxane anti-fog coating to reduce condensation.
In addition, environmentally friendly coatings are gradually being applied: random copolymer polypropylene (PP), polylactic acid (PLA), and other bio-based coatings. Although PLA has a temperature resistance of only 50℃, it is suitable for cold beverage scenarios and meets biodegradability requirements.
3.2 Differentiated Features of Coating Functionality
Coating functionality needs to precisely match the pain points of different scenarios. The core functional differences between the two types of paper cups with lid are as follows:
| Functional Dimension | Requirements for Hot Drink Disposable Paper Cups | Requirements for Cold Drink disposable paper cups |
| Heat Resistance | Immersion in 90℃±5℃ hot water for 30 minutes, no cracking or leakage | No high-temperature resistance required, focus on preventing low-temperature embrittlement |
| Impermeability | Prevents internal hot liquid penetration, strong bond between coating and paper | Prevents bidirectional penetration of internal liquid and external condensation |
| Special Functions | Heat insulation, anti-scalding | Anti-condensation, anti-fog (some products) |
| Environmental Friendliness | Priority given to heat-resistant and biodegradable PP coatings | PLA and other bio-based coatings can be used to meet degradation requirements |
For example, hot drink cup coatings need to pass a "high-temperature bonding strength test": the coated paper is immersed in 95℃ hot water for 1 hour, and the coating peel strength should be ≥5N/25mm; cold drink cups need to pass a "bidirectional anti-seepage test": filled with 4℃ ice water internally and simulating condensation externally, with no leakage for 6 hours.
3.3 Technological Development of Coating Processes
The advancement of coating technology directly drives the performance upgrade of disposable paper cups. The mainstream process is extrusion coating, but the process parameters for the two types of disposable paper cups differ significantly.
Hot Drink Disposable Paper Cups:
- Coating temperature controlled at 200-220℃ (higher than the PE melting point to ensure uniform coating);
- Using a "multi-layer co-extrusion" process to complete the coating of PE + functional additives in one step, reducing the risk of coating delamination;
- After coating, it needs to undergo 120℃ hot pressing to improve the bonding strength between the coating and the paper.
Disposable Paper Cups for Cold Beverages:
- The coating temperature is slightly lower (180-200℃) to avoid high temperatures affecting the paper's moisture resistance;
- The anti-fog coating uses an "offline coating" process: the PE coating is applied first, followed by spraying a siloxane anti-fog agent on the outside, and then dried at 80℃ to ensure a long-lasting anti-fog effect;
- The coating thickness is precisely controlled within ±1μm to avoid excessive thickness affecting the feel or insufficient thickness leading to leakage.
IV. Specific Requirements for Heat and Cold Resistance Performance Indicators
4.1 Technical Standards for Heat Resistance Performance
The heat resistance of a hot beverage paper cup with lid is a core safety aspect, and relevant standards clearly define quantitative indicators and test methods:
Basic indicators: Ordinary hot beverage cups can withstand temperatures of 85-90℃, with a recommended usage temperature of ≤85℃; high-end products can withstand temperatures of 95-140℃, suitable for boiling water, hot soup, etc.
Test method: According to GB/T 27590-2022 requirements, the paper cup is placed flat, 90℃±5℃ hot water is poured to 6mm below the rim, and covered for 30 minutes. The following conditions must be met:
No obvious deformation, cracking, or peeling;
No leakage or dripping;
Stiffness loss rate of the cup body ≤10%.
No leakage or dripping;
Stiffness loss rate of the cup body ≤10%.
Rigorous testing: Some companies use "extreme condition testing"—maintaining 85-95℃ hot water for 1-2 hours, requiring a deformation rate of ≤5%. A certain chain restaurant company improved the heat resistance of its disposable paper cups to 100℃ by optimizing materials and structure, resulting in a 62% reduction in customer complaints related to hot beverages.
4.2 Technical Requirements for Cold Resistance Performance
The cold resistance of cold beverage disposable paper cups focuses on structural integrity and impermeability at low temperatures. The indicators and test methods are as follows:
Basic indicators: Ordinary cold beverage cups need to withstand -10℃, while high-end products (such as ice cream cups) can withstand -18℃, ensuring no brittle cracking after refrigeration or freezing. Testing Methods:
- Low-temperature immersion test: Immersed in -10℃ cold water for 3 hours, the cup body showed no deformation or cracking;
- Freezing test: Frozen at -18℃ for 24 hours, then returned to room temperature. The cup body maintained a hardness retention rate of ≥80%, and a leakage rate of ≤0.5%;
- Condensation test: Filled with 4℃ ice water for 6 hours, the outer wall showed no softening and no condensation penetration.
A certain brand of ice drink cup, after being subjected to the -18℃ freezing test, could still withstand a weight of 500g without bottom collapse, meeting the requirements for holding ice cream.
4.3 Standardization System of Performance Indicators
GB/T 27590-2022 "Disposable Paper Cups" establishes a comprehensive performance indicator system, classifying disposable paper cups into premium, first-class, and qualified grades based on quality. The core indicators include:
| Indicator Category | Premium Grade Requirements (Example) | Test Basis |
| Cup Body Stiffness | 250mL cup ≥3.00N, 500mL cup ≥3.60N | GB/T 27590-2022 6.3 |
| Temperature Resistance | No deformation after 3 hours in 80℃ hot water, no deformation after 3 hours in -10℃ cold water | GB/T 27590-2022 6.5 |
| Leakage Performance | No water leakage or seepage from the bottom or sides | GB/T 27590-2022 6.4 |
| Bio-based Content | Degradable cups ≥50% | GB/T 27590-2022 6.8 |
| Biodegradation Rate | ≥90% (or more than 90% of the reference material) | GB/T 27590-2022 6.9 |
In addition, the standard explicitly prohibits phthalate plasticizers and chlorine-based bleaching agents, and restricts the use of recycled waste paper, ensuring the safety and environmental protection of disposable paper cups throughout the entire chain.
V. Industry Development Trends and Technological Innovation
5.1 Application Prospects of New Material Technologies
Bio-based materials are the core innovation direction in the paper cup industry, requiring a balance between environmental friendliness and suitability for various scenarios:
Polylactic acid (PLA): Currently mainly used in cold drink cups. Although its temperature resistance is only 50℃, its biodegradability rate exceeds 90%. Through modification (such as blending with PBAT), the temperature resistance of PLA can be increased to 70℃, and it is expected to be suitable for medium-temperature beverages in the future (such as milk tea at 40-60℃).
Bio-based PE: PE synthesized from plant starch as a raw material. Its heat resistance is comparable to traditional PE (melting point 120-140℃). It has been piloted in some hot drink cups, with a bio-based content of 60%, balancing heat resistance and environmental protection.
Aerogel composite paper: By embedding nano-aerogel (thermal conductivity 0.018W/(m·K)) into the base paper of the paper cup, the outer wall temperature of the hot drink cup can be further reduced by 5-8℃, while reducing the amount of base paper used by 10%, achieving "lightweight + high insulation".
Bio-based PE: PE synthesized from plant starch as a raw material. Its heat resistance is comparable to traditional PE (melting point 120-140℃). It has been piloted in some hot drink cups, with a bio-based content of 60%, balancing heat resistance and environmental protection.
Aerogel composite paper: By embedding nano-aerogel (thermal conductivity 0.018W/(m·K)) into the base paper of the paper cup, the outer wall temperature of the hot drink cup can be further reduced by 5-8℃, while reducing the amount of base paper used by 10%, achieving "lightweight + high insulation".
5.2 Technological Breakthroughs in Functional Disposable Paper Cups
Functional double wall paper coffee cups are constantly being iterated to meet the needs of specific scenarios:
- Smart temperature-controlled disposable paper cups: Thermochromic ink is added to the cup wall. When the beverage temperature is >65℃, it turns red (indicating it's too hot); when it's <40℃, it turns blue (indicating it's suitable for drinking), suitable for children, the elderly, and other groups.
- Antibacterial disposable paper cups: 0.3%-0.5% silver ion antibacterial agent is added to the coating, achieving an antibacterial rate of ≥99% against E. coli and Staphylococcus aureus, extending the shelf life of beverages by 2-3 days, suitable for freshly made tea beverages.
- High-barrier disposable paper cups: Using a "PE+EVOH+PE" three-layer coating, the oxygen transmission rate is ≤5cm³/(m²·d·atm), which is 90% lower than ordinary PE cups, suitable for flavored beverages that require long-term preservation (such as concentrated fruit juice). 5.3 Upgrading Requirements for Environmental Standards
Environmental standards are continuously tightening, driving the industry towards a "full life cycle sustainability" transformation:
- Materials: Bio-based content and biodegradability are becoming mandatory indicators. The EU has required that double wall paper coffee cups be 100% compostable starting in 2025, and China is also promoting similar regulations.
- Production: Limiting VOC emissions, promoting water-based ink printing, and solvent-free coating processes. A leading company has reduced carbon emissions in paper cup production by 25% through process optimization.
- Recycling: Establishing a closed-loop recycling system of "paper cup - pulp - new paper cup". High-efficiency separation of PE coating and pulp has been achieved, with a pulp recycling rate of 80%, and is expected to replace some virgin pulp in the future.
The difference between disposable paper cups for cold and hot drinks is essentially a technological differentiation based on "temperature scenario adaptability," with the following differences:
Material differences: Hot drink cups have higher basis weight (210-330 g/m²) and a higher proportion of softwood pulp (6:4 to 7:3), focusing on high-temperature strength; cold drink cups have medium basis weight (170-250 g/m²) and a higher proportion of hardwood pulp (≥50%), focusing on moisture resistance and low-temperature toughness.
Structural differences: Hot drink cups have double walls, a thick bottom, and a rolled rim, primarily addressing heat insulation and thermal deformation; cold drink cups have corrugated walls, a moisture-proof bottom, and an anti-fog coating, mainly addressing condensation and low-temperature brittleness.
Coating differences: Hot drink cups use high-melting-point PE (≥120℃), with a thickness of 25-30 μm; cold drinks use double-layer PE + anti-fog coating, focusing on bidirectional impermeability.
Structural differences: Hot drink cups have double walls, a thick bottom, and a rolled rim, primarily addressing heat insulation and thermal deformation; cold drink cups have corrugated walls, a moisture-proof bottom, and an anti-fog coating, mainly addressing condensation and low-temperature brittleness.
Coating differences: Hot drink cups use high-melting-point PE (≥120℃), with a thickness of 25-30 μm; cold drinks use double-layer PE + anti-fog coating, focusing on bidirectional impermeability.
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