Common Misconceptions in Paper Coffee Cup Usage
author: Iris
2025-12-23
I. Paper Cup Material Types and Structural Characteristics
1.1 Coated Cups
Paper coffee cups are generally composed of food-grade wood pulp paper and a food-grade coating. The coating is crucial to the functionality of the paper cup. Currently, the main types of paper cup coatings on the market are wax-coated cups, polyethylene-coated cups, and new, environmentally friendly coated cups.
Wax-coated cups are an early product, with a surface coated with paraffin wax. They have good waterproof performance in cold drink environments of 0℃ - 5℃. However, paraffin wax has a low melting point, generally not exceeding 60℃. When the temperature exceeds 40℃, the wax layer easily melts, causing the paper cup to absorb water, deform, or even leak. These are now gradually being phased out of the market.
Polyethylene-coated cups are currently the mainstream. During molding, the paper surface is coated with a 15-20 micrometer thick polyethylene (PE) plastic coating, like a layer of plastic film, which effectively prevents liquid leakage and can withstand hot water at 80-100℃. The national standard GB/T 27590-2022 has strict requirements for paper cup coating materials, stipulating that PE, PP, and PET coated paper and cardboard used in paper cups should comply with GB/T 36392, prohibiting the use of phthalate plasticizers, and recommending the use of random copolymer polypropylene (PP) or polylactic acid (PLA) to ensure that the coating materials do not release harmful substances during use. However, some inferior paper cups may use industrial paraffin wax or coatings containing lead and mercury. These materials can easily release carcinogenic substances such as polycyclic aromatic hydrocarbons or heavy metals at high temperatures, seriously endangering health. Therefore, consumers must pay attention to the product's material labeling and quality certification when purchasing paper cups.
1.2 Double-Layer Insulated Cups
Double-layer insulated cups use a special double-layer structure, creating an air insulation layer between the inner and outer layers for insulation. The principle is to utilize the low thermal conductivity of air to reduce the temperature of the cup wall and prevent users from being scalded. They are mainly divided into straight-walled double-layer cups and hollow cups. Straight-walled double-layer cups have two layers of paper with air in between, providing excellent insulation and safely holding hot drinks at 95℃. Hollow-walled cups have a hollow interior with a gap between the two layers, resulting in superior insulation and cooling performance, a wide range of applications, and no need for an additional cup sleeve.
The insulation effect of double-walled insulated cups is affected by the thickness and structural design of the insulation layer. However, 70% of double-walled cups on the market experience a 5-10℃ drop in inner temperature after 10 minutes, mostly due to a thin insulation layer or poor material quality. Furthermore, some inexpensive double-walled cups have plastic lids that release harmful substances in hot water. In a sample of 20 double-walled disposable paper cups tested by a quality inspection department, 8 had material problems, and 3 released excessive amounts of harmful substances at temperatures above 70℃.
The main safety hazards of using double-walled insulated cups include: firstly, improper insulation layer design leading to poor insulation and a risk of burns; secondly, the cup lid material may release harmful substances at high temperatures; and thirdly, the double-walled structure may delaminate or crack after prolonged use, affecting safety.
1.3 Biodegradable Cups
Biodegradable cups are an environmentally friendly product that has emerged in recent years, often using bio-based materials such as polylactic acid (PLA) or polybutylene succinate (PBS) as coatings or cup body materials. These materials have good biodegradability and can decompose into carbon dioxide and water under specific conditions, making them environmentally friendly.
Polylactic acid (PLA) is a common material for biodegradable cups, made from the fermentation of crops such as corn. The production process is pollution-free, and it is biodegradable and can be recycled in nature. PLA degradation occurs in two steps: first, hydrolysis, where the ester bonds in the PLA molecular chain break down into oligomers and lactic acid monomers under the action of heat and moisture; then, microbial mineralization, where microorganisms metabolize lactic acid into carbon dioxide, water, and biomass under aerobic conditions.
The degradation performance of biodegradable cups is affected by various factors. In an industrial composting environment, with a stable temperature of 55-70℃ and humidity of 50-60%, PLA cups can completely decompose in 6-12 months. However, in ordinary environments, such as household garbage cans or outdoor soil, the temperature is usually below 25℃, and the activity of degrading enzymes is extremely low. PLA cups may take more than 50 years to decompose slowly, which is not significantly different from ordinary plastics. National standard GB/T 27590 - 2022 clearly specifies the requirements for the biodegradability of biodegradable cups: the maximum biodegradation rate of the finished paper cup product should be greater than or equal to 90% or reach more than 90% of the biodegradation rate of the reference material, and the maximum biodegradation rate of the disposable paper cup base paper must also meet the same requirements. For compostable paper cups, requirements such as a disintegration degree greater than or equal to 90% and passing ecotoxicity tests must also be met.
1.4 Other Special Function Paper Coffee Cups
In addition to the common paper coffee cups mentioned above, there are also special-function paper cups on the market, such as antibacterial paper cups, oil-resistant paper cups, and anti-scald paper cups. These cups meet specific functional needs through special material formulations or processing techniques.
Antibacterial paper cups generally achieve their antibacterial function by adding antibacterial agents such as silver ions and copper ions to the coating. These antibacterial agents can destroy bacterial cell membranes, inhibit bacterial reproduction, extend the shelf life of paper cups, and improve safety. However, long-term contact with antibacterial agents may affect the human immune system, especially in children and sensitive individuals.
Oil-resistant paper cups are used to hold oily foods, such as milk tea and coffee. They use a special oil-resistant coating that effectively prevents oil penetration. However, the oil-resistant coating may contain perfluorinated compounds (PFCs), which are chemically stable, difficult to degrade in the environment, and may accumulate in the human body, causing adverse effects on thyroid function and the immune system.
Anti-scald paper coffee cups may use a double-layer structure, and may also have an anti-scald sleeve on the outside of the cup or use special paper materials. However, the material of the anti-scald sleeve may not meet food contact standards, and it may also detach after long-term use, affecting the anti-scald effect.
II. Misconceptions about Paper Cup Use in Different Scenarios
2.1 Daily Household Use
A common misconception when using paper cups in daily household life is reusing them. Many families wash and reuse disposable paper coffee cups to save money or for convenience, especially during parties or when entertaining guests. However, the design of paper cups is not suitable for reuse. After repeated contact with liquids, the cup's body strength decreases, and it easily absorbs dust and bacteria, increasing the risk of infection. Studies have shown that when paper cups are reused, the amount of bacteria in the cup can double within one hour in a humid environment due to residual sugars and milk stains, potentially causing gastrointestinal discomfort. Furthermore, the coating may experience minor damage after the first use (difficult to detect with the naked eye), leading to leakage or increased substance migration during subsequent use.
Improper temperature use is also a significant problem with household paper cup use. Many families don't differentiate between cold drink cups and hot drink cups, often using cold drink cups for hot beverages. Cold drink cups are treated with a wax coating, which is safe at 0℃ - 5℃. However, if used for hot drinks, and the water temperature exceeds 62℃, the wax will melt, causing the paper cup to absorb water and deform. In addition, incorrect practices such as pouring boiling water directly into paper cups, heating paper cups in a microwave, or using the same paper cup to hold hot drinks for extended periods, not only cause the paper cup to deform and leak, but also accelerate the migration of chemical substances from the coating, increasing health risks. Research from Zhejiang University shows that using disposable paper cups to hold 95℃ hot water resulted in over 25,000 microplastic particles per cup after 15 minutes.
In terms of storage, many families store paper coffee cups haphazardly in damp environments such as kitchen corners and pantries, leading to mold growth. Paper cups are primarily made of pulp, which is highly hygroscopic. If left in a damp environment for more than 24 hours, mold can grow. If opened paper cups are not sealed promptly, they can easily absorb dust and bacteria, affecting their safe use.
2.2 Commercial Environments such as Cafes and Restaurants
In commercial environments, misconceptions about paper cup use are concentrated in areas such as bulk purchasing, storage, and improper usage management. Many cafes and restaurants purchase low-priced paper coffee cups in bulk to reduce costs, neglecting product quality and safety standards. A special inspection by a provincial market supervision department in 2024 found that 30% of small paper cup manufacturers did not meet hygiene standards, with some products having bacterial counts exceeding the standard by more than 10 times, and also detecting pathogenic bacteria such as E. coli and Staphylococcus aureus.
Temperature management issues are even more serious in commercial environments. While cafes serve high-temperature coffee (90-95℃), many businesses use ordinary paper cups, only suitable for beverages below 60℃. Using single-layer paper cups for hot coffee can result in an outer surface temperature of 65-70℃, requiring users to use cup sleeves or coasters to avoid burns. However, some businesses reduce or eliminate cup sleeves to save costs, increasing the risk of burns for customers.
The reuse of paper cups is also common in commercial settings. When restaurants have high customer traffic, they may reuse seemingly "clean" paper cups. During breakfast hours, the same paper cup might be used to hold various hot drinks such as coffee, soy milk, and porridge. This violates the principle of using disposable items and greatly increases the risk of cross-contamination.
Improper storage and management are also widespread in commercial environments. To save space, businesses stack paper coffee cups in poor environments such as kitchens and storage rooms, making them susceptible to contamination from oil fumes, dust, and moisture. Opened paper cups, if not properly stored, are also easily contaminated, affecting food safety.
In addition, improper labeling is a common problem. Many businesses use the same paper cups for both cold and hot drinks, without distinguishing between cold and hot beverage cups. National standards clearly stipulate that cold drink cups and ice cream cups cannot be used for hot drinks, as this affects taste and hygiene safety.
2.3 Takeaway Delivery Scenarios
In takeaway delivery scenarios, the use of disposable paper cups faces complex challenges and specific misconceptions. Temperature control is the primary issue. During takeaway delivery, the temperature of hot drinks fluctuates significantly, from the high temperature during preparation (over 80℃) to possibly cooling down to room temperature by the time it reaches the consumer. During this process, the paper cup undergoes multiple temperature changes, accelerating coating aging and chemical migration.
Prolonged storage is a common misconception in takeaway scenarios. After receiving their takeaway, consumers may not be able to drink it immediately for various reasons, resulting in hot drinks being stored in paper cups for extended periods. Studies show that the risk of coating decomposition increases significantly when hot drinks are stored in paper cups for more than 15 minutes, and the risk doubles after more than one hour.
Packaging design also presents misconceptions. Some takeaway businesses use low-quality paper cups to save costs, or fail to take appropriate insulation measures during packaging, causing the beverage temperature to drop rapidly or the cup body temperature to become excessively high. Some paper coffee cups have a metal coating for waterproofing, but this metal coating can produce sparks when heated in a microwave oven, posing a safety hazard.
Improper handling of special beverages in takeaway scenarios is also a problem. Many beverages in food delivery orders, such as milk tea and coffee, have high levels of milk and sugar, making them prone to bacterial growth and spoilage if stored for too long in high temperatures. Acidic beverages, such as fruit juices and carbonated drinks, can accelerate the decomposition of the paper cup coating, increasing the migration of chemical substances.
Physical damage during delivery should also not be overlooked. Food delivery orders may be subjected to squeezing and collisions, leading to deformation or damage of the paper cups. Double-walled insulated cups, in particular, may delaminate or crack under external force, compromising their safety.
2.4 Office Environment
The office environment is a frequent setting for paper cup use, and also a place where misconceptions are concentrated. The problem of reuse is particularly prominent; many office workers, for convenience, use the same paper cup all day long, filling it with various beverages such as coffee, tea, and mineral water. This is not only unhygienic but also causes the inner coating of the paper cup to peel off, increasing the intake of chemical substances gradually.
Temperature-related misconceptions are also serious in the office environment. Office water dispensers often dispense water at temperatures exceeding 90℃, and many employees directly use ordinary paper cups to hold boiling water. Studies show that when the water temperature exceeds 70℃, the paper cup coating may release microplastics or small organic molecules, and when the water temperature reaches 85℃, the PE coating softens, its barrier properties decrease, and substance migration accelerates.
Improper storage is also common in office environments. Paper cups are often stored in public areas such as pantries and corridors, which have high traffic and are easily contaminated. If opened paper coffee cups are not sealed promptly, they can easily absorb dust and bacteria. Some offices also stack paper cups on top of filing cabinets or other unclean places to save space, increasing the risk of contamination.
There are also some specific misconceptions in the office environment, such as using the same paper cup to brew tea or coffee and soaking it for a long time; using paper cups to heat food or beverages in a microwave oven; directly marking names or uses on disposable paper cups with oil-based pens, which may lead to the migration of harmful substances; and using paper cups to hold alcoholic beverages, such as drinking beer or spirits from paper cups during office gatherings. In the office environment, there is a lack of supervision over paper cup use, and employees have weak safety awareness, believing that paper cups are "disposable" and using them casually, neglecting safety issues.
III. Detailed Explanation of Misconceptions in the Use of Different Types of Paper Cups
3.1 Coated Cups
Misconceptions regarding coated black paper cups mainly concern temperature control, cleaning methods, and storage conditions. Regarding temperature use, many consumers believe that all paper cups can hold hot water, ignoring the differences in temperature resistance of different coating materials. Although PE-coated cups can withstand temperatures of 100℃, they still undergo changes at high temperatures. Studies show that when the temperature exceeds 85℃, the PE coating softens, its barrier properties decrease, and trace amounts of substances may migrate into hot beverages. Consumers also make the mistake of adding ice cubes to hot drinks to cool them down quickly. This subjects the paper coffee cups to drastic temperature changes, accelerating the aging and peeling of the coating.
There are also misconceptions regarding cleaning methods. Many consumers believe paper cups are "disposable" and use them directly without cleaning. However, newly purchased paper cups may retain chemical substances from the manufacturing process; rinsing them with clean water before use can reduce the intake of harmful substances. Conversely, some consumers over-clean, using detergents and other chemical cleaning agents to wash paper cups in an attempt to reuse them. This damages the coating structure of the paper cups and increases safety risks.
Regarding storage conditions, common misconceptions include storing paper cups in high-temperature environments, such as near heaters or ovens; storing them in humid environments, leading to mold or deterioration of the coating; storing them with other chemicals, which may cause chemical reactions; and prolonged exposure to sunlight, leading to coating aging.
Furthermore, when purchasing paper cups, consumers often only focus on price and appearance, neglecting the quality of the coating. High-quality PE-coated cups should have a uniform, smooth inner wall without bubbles or granular texture. Inferior paper cups may have uneven coatings, bubbles, and odors, and are more likely to release harmful substances during use.
3.2 Double-Walled Insulated Cups
Misconceptions regarding double-walled insulated cups manifest in structural understanding, usage methods, and maintenance. Many consumers misunderstand the insulation principle, believing that double-walled cups provide complete insulation. They don't pay attention to temperature control and directly hold hot drinks for extended periods, leading to burns. In reality, the insulation effect of double-walled cups depends on the design and material of the insulation layer; 70% of double-walled cups on the market have unsatisfactory insulation effects.
Common misconceptions regarding usage include heating double-walled cups in a microwave, leading to cup deformation or the release of harmful substances; scratching the cup wall with sharp objects, damaging the insulation layer structure; holding hot drinks with the lid not fully sealed, leading to burns; and immediately filling the cup with cold drinks after holding hot drinks for a long time, leading to cup breakage.
Regarding maintenance, many consumers believe that double-walled black paper cups are complex and difficult to clean, so they rarely clean them, leading to bacterial growth inside the cup. In fact, double-walled cups should be cleaned regularly, especially the lid and rim, using a soft cloth and warm water. Consumers also use hard cleaning tools such as steel wool, which can scratch the cup wall and affect safety.
Temperature control misconceptions are more prominent in double-walled cups. Consumers often believe that double-walled cups can maintain beverage temperature, so they pour boiling water directly into them and store them for a long time. This not only accelerates coating aging but may also lead to cup deformation or cracking. The correct practice is to cool boiling water to below 75℃ before pouring it in, and avoid storing hot drinks for more than one hour.
3.3 Biodegradable Cups
Misconceptions about biodegradable cups focus on understanding degradation conditions, choosing the right usage environment, and proper disposal methods. Many consumers misunderstand the degradation conditions, believing that biodegradable cups decompose quickly in any environment and dispose of them carelessly. In reality, biodegradable cups require specific conditions for degradation; in ordinary environments, PLA cups may take more than 50 years to decompose.
Regarding the choice of usage environment, there are misconceptions such as using biodegradable cups in high-temperature environments, such as holding hot drinks above 80℃, leading to cup deformation; using them in oily environments, such as holding foods with high oil content, accelerating coating decomposition; using them in acidic environments, such as holding fruit juices or carbonated drinks, affecting degradation performance; and long-term storage in humid environments, leading to premature degradation or mold growth.
Disposal misconceptions are a more serious problem in the use of biodegradable cups. Many consumers dispose of biodegradable cups with ordinary garbage or put them in recycling bins, which affects the recycling of biodegradable materials and may cause environmental pollution. The correct practice is to put biodegradable black paper cups in organic waste bins or send them to specialized composting facilities.
In addition, consumers are prone to quality identification misconceptions when purchasing, believing that paper cups labeled "biodegradable" are environmentally friendly, neglecting product quality. Some so-called "biodegradable cups" may only contain a small amount of biodegradable components, with most still being ordinary plastic. Consumers should check the product's degradation certification, such as ASTM D6400, EN 13432, and other international certifications, when purchasing.
3.4 Special Function Paper Cups
Misconceptions about special-function paper cups are reflected in functional understanding, applicable scope, and safety risks. Misconceptions about antibacterial paper cups include over-reliance on the antibacterial function, using them for extended periods without replacement, using them in high-temperature environments, leading to the inactivation of antibacterial agents or the production of harmful substances; using them to hold food, causing antibacterial agents to migrate into the food; and mixing them with other antibacterial products, which may cause adverse reactions.
Misconceptions about oil-resistant paper coffee cups mainly involve misunderstanding their scope of application. Many consumers believe that oil-resistant paper cups can hold all oily foods, including high-temperature fried foods. In reality, the oil resistance of these cups is limited, and in high-temperature or high-oil environments, the oil-resistant coating may decompose, releasing harmful substances. Furthermore, the oil-resistant coating may contain perfluorinated compounds, and long-term contact may affect human health.
Misconceptions about heat-resistant paper cups include over-reliance on the heat-resistant function, neglecting temperature control; directly touching the cup with hands when the cup body is too hot; improper use leading to the peeling of the heat-resistant layer and loss of heat resistance; and using heat-resistant paper cups for other purposes, such as microwave heating.
There are also paper cups with special printing effects, such as fluorescent printing and three-dimensional printing. The main misconception here concerns the safety of the ink. Consumers often overlook the heavy metals and organic solvents that may be present in the printed patterns, especially the printing near the rim of the cup, which may come into direct contact with the lips during use, increasing health risks. National standards stipulate that printing should not be present within 15mm of the cup rim and within 10mm of the black paper cup's bottom.
How to Deal with an Odor in a Plastic Round Bowl?
Comparison of Disposable and Plastic Reusable Plates
Related Article
You searched for 4 oz Chinese take out boxes — but what you actually need may not be a paper box at all. The folded paper container with the wire handle looks iconic, but for 4 oz portions of sauce, dressing,
4 oz Chinese Take Out Boxes Alternative — Clear PP Portion Cups
Looking for plastic to-go containers with lids in bulk? Every container we ship includes a matching lid — not as an optional add-on,
Plastic To-Go Containers with Lids Wholesale | Bulk PP Food Boxes
SEND MESSAGE