Common Reasons for Non-Compliant Paper Tea Cups

I. Analysis of the Main Reasons for Non-Compliant Paper Tea Cups

1.1 Raw Material Safety Issues

• Pathogenic bacteria and microbial contamination
• Residues of heavy metals such as lead and cadmium
• Polychlorinated biphenyls (PCBs)
• Volatile aldehydes and other harmful substances

• Potential to cause cell mutations and potential carcinogenicity
• Difficult to decompose after entering the human body, and can accumulate in organs such as the liver
• Interfering with the endocrine system and affecting hormone levels
• Strong irritating effect on skin and mucous membranes, potentially causing allergic reactions

• Polyolefin emulsions: FDA-compliant, with extremely low VOC content
• Silicone polymers: Safe and environmentally friendly, free of harmful substances such as fluorocarbons, styrene, and BPA
• Alkyl ketene dimer (AKD): A traditional waterproofing agent, but it may pose a risk of residue

• Carcinogenic substances such as benzene and toluene
• Heavy metals such as lead, cadmium, and mercury; national standards stipulate that the residual amounts of five heavy metals must meet the requirements.
• Aromatic primary amines, with a total migration amount that must not be detectable (detection limit 0.01 mg/kg)
• Solvent residue: Benzene solvents must not exceed 0.1 mg/kg, and ethyl acetate must not exceed 5 mg/kg

• Industrial calcium carbonate and talc in recycled paper
• Inferior PE/PP coating materials
• Printing inks and coatings

1.2 Safety Risks in Manufacturing Processes

• Polyurethane adhesives contain isocyanates, which can cause skin allergies and respiratory problems.
• Solvent-based glues may leave behind VOCs (volatile organic compounds), such as formaldehyde, benzene, and toluene.
• Hot-melt adhesives may release harmful gases at high temperatures of 150-180℃.
• High-temperature risks associated with the lamination process.

• They can penetrate intestinal epithelial cells and enter the bloodstream.
• They accumulate in organs such as the liver, spleen, and placenta, affecting metabolic, immune, and reproductive functions.
• They act as "toxic carriers," adsorbing heavy metals, pesticide residues, and other harmful substances.
• They disrupt the balance of gut microbiota, leading to a 30% reduction in beneficial bacteria.

• Currently, there is no concept of food-grade ink in China, nor are there printing inks approved for contact with food.
• Ink printed on the rim of the cup is easily contacted by the lips and ingested when drinking.
• When cups are stacked, the printing on the bottom can easily rub against the inner wall of another cup.

• Benzene compounds and heavy metals (lead, arsenic, etc.), which may leach into beverages with high-temperature liquids.
• Fluorescent substances, benzene, and toluene in industrial inks.
• Some paper tea cups use coatings containing lead and mercury, which can easily release polycyclic aromatic hydrocarbons (potentially carcinogenic) at high temperatures.

 

1.3 Cases of Non-compliance with Hygiene Indicators

• The cleanliness of the production workshop is substandard, and the cleaning and disinfection of air, equipment surfaces, pipes, and conveyor belts are inadequate.
• Production personnel have poor hygiene awareness and improper operating procedures.
• Production equipment and tools are not regularly cleaned and disinfected, becoming breeding grounds for microorganisms.

• The paper pulp used in black paper cups is highly hygroscopic; mold may grow if left in a humid environment for more than 24 hours.
• Storage environments with humidity exceeding 65% and temperatures exceeding 30℃ provide favorable conditions for microbial growth.
• Packaging materials are of substandard quality or become contaminated during storage and transportation.
• The shelf life of paper tea cups is generally 2 years; the risk of excessive microbial levels increases significantly for expired products.

• Contamination caused by manual handling during the packaging process
• Environmental impact during transportation and distribution
• Improper storage before consumer use

1.4 Other Safety Risk Factors

• Using low-grammage (insufficient thickness) paper for the cups
• Production process problems, such as insufficient molding pressure or improper temperature control
• Companies are not using food-grade cardboard raw materials to reduce costs

• Poor connection between the cup body and the bottom
• Defects in the lamination process, such as incomplete lamination or uneven lamination
• Poor paper quality and insufficient fiber bonding strength

• Excessive total migration: The standard stipulates ≤10mg/dm² (except under special conditions). A low-priced paper cup using recycled paper base + inferior PE lamination had a migration amount of 32mg/dm² in 95% ethanol, exceeding the standard by 3 times. This was traced back to the dissolution of the plasticizer DEHP in the recycled paper.
• Excessive potassium permanganate consumption: The standard stipulates ≤40mg/kg (water immersion solution). Laboratory statistics show that the non-compliance rate for paper tea cups using non-food-grade ink exceeds 35%, with measured values often reaching 60-90mg/kg, indicating excessive solvent residue or degradation products.
• Heavy metal migration: Lead (Pb) limit ≤1mg/kg, arsenic (As) limit ≤0.1mg/kg. These heavy metals mainly come from recycled paper, printing inks, and coatings. Labeling Issues

• Lack of production license number and QS/SC mark
• Failure to indicate the applicable standard (e.g., GB/T 27590-2022, GB 4806.8-2022)
• Missing basic information: product name, material, production date, shelf life, manufacturer name and address, etc.
• Failure to indicate "for food contact" or the temperature range of use
• Unclear labeling of hot and cold drink cups, leading to misuse

 

II. Guide to Avoiding Pitfalls When Buying Paper Tea Cups

2.1 Key Points for Checking Product Labels

• QS/SC production license mark and number: This is the most basic entry requirement; do not buy if it's missing.
• Applicable standard number: Must indicate GB/T 27590-2022 or GB 4806.8-2022
• Product name and material: such as "inner layer food-grade PE coating."
• Production date and shelf life: The shelf life of black paper cups is generally 1-2 years.
• Manufacturer information: name, address, contact information
• Instructions for use: including temperature range of use, "for food contact" mark, etc.

• Hot drink cups usually have a "suitable for hot drinks" mark at the bottom and can withstand temperatures up to ≤100℃.
• Cold drink cups are generally coated with edible wax on the surface and are strictly prohibited from being used for hot drinks; otherwise, the wax layer will melt and mix into the food.
• Check for "biodegradable" or "compostable" marks, which are indicators of environmentally friendly products.

2.2 Method for Judging Appearance Quality

• The cup body should be smooth and wrinkle-free, with no curled or frayed edges at the rim.
• The cup body should be firm and of uniform thickness; generally, good paper tea cups have a thickness of 200-300 grams/square meter.
• The coating layer should be uniform, without leakage, bubbles, or delamination.
• The printed pattern should be clear, and the printing should be at least 15mm from the rim. There should be absolutely no printing on the inside of the cup.
• The color should be natural; avoid choosing overly white paper tea cups (which may contain excessive fluorescent whitening agents).

• After opening the packaging, smell the cup to see if there is any pungent odor (ink smell, plastic smell, sour smell, etc.).
• Qualified paper tea cups should have no odor or only a slight paper smell.
• If you smell a strong chemical odor, it indicates that there may be chemical residue, and you should definitely not buy it.

• Shine a UV light (254nm or 365nm) on the inside of the paper cup.
• If a noticeable blue fluorescence appears, it indicates that the fluorescent whitening agent exceeds the standard.
• High-quality paper tea cups should have no fluorescent reaction under UV light.

• Gently squeeze the cup body with your fingers. High-quality paper tea cups maintain their stiffness and do not deform after being released.
• If the cup body deforms easily and becomes soft, it indicates poor paper quality and insufficient stiffness.
• The bottom of the cup should also have a certain degree of hardness and should not be too soft.

2.3 Usage Scenario Selection Suggestions

• Ordinary paper tea cups (no label): Only suitable for beverages ≤60℃
• Hot drink cups: Can hold 80-100℃ beverages, the cup body is thicker, and the inner wall has a PE coating.
• Cold drink cups: Do not use for hot drinks, as the cup body is prone to deformation and leakage.

• For hot water and hot coffee: You must choose paper tea cups labeled "suitable for hot drinks".
• For carbonated drinks and juices: Choose acid-resistant paper tea cups to prevent acidic substances from accelerating chemical migration.
• For alcoholic beverages: Pay special attention, alcohol above 50 degrees will dissolve the polyethylene particles in the PE coating, and inferior paper tea cups may even release plasticizers. It is not recommended to use disposable paper tea cups for high-proof alcohol.

2.4 Brand and Price Reference

• Paper tea cups produced by regular manufacturers generally cost 0.3-0.5 yuan per cup.
• Paper tea cups below 0.2 yuan are likely to have quality problems.
• Especially cheap paper tea cups (e.g., 100 cups for a very low price) should be avoided. (Even if they cost only a few yuan) Absolutely do not buy them!

• Prioritize regular distribution channels such as supermarkets and large convenience stores.
• Choose products from well-known brands for better quality assurance.
• Check the product's inspection report or quality certification.

2.5 Simple Home Testing Methods

• Pour hot water at about 90℃ into the paper cup.
• Let it stand for 30 minutes and observe if the cup body deforms or leaks.
• Smell it to check for any unusual odors.
• Check if the inner coating is peeling off.

• Wipe the printed pattern with a wet tissue and observe if the color fades.
• If the color fades significantly, it indicates poor ink quality and may contain harmful substances.

• Fill the paper cup with water, lift it, and gently shake it.
• Observe if the cup body deforms or leaks.
• A high-quality paper cup should be able to withstand the weight of the water without deforming.

III. Summary and Suggestions

• Carefully check the product label to ensure it has the QS/SC mark and complete product information.
• Use the "look, smell, touch, and squeeze" method to initially assess quality.
• Choose products from regular channels and well-known brands.
• Select the appropriate type of paper cup based on the usage scenario.
• Avoid buying products that are too cheap.