Uncoated kraft paper is a food-grade packaging material made from virgin wood pulp, designed specifically for direct food contact without any chemical coatings. Its core advantages lie in food safety and environmental friendliness, making it an ideal choice for low-oil, dry food products.
Raw Material: It is crafted from 100% softwood kraft pulp (e.g., pine, spruce), which boasts long fibers for exceptional toughness and strength. No recycled pulp is used, as it may contain impurities or fluorescent agents that fail to meet food-grade standards.
Food-Grade Production: The manufacturing process adheres to strict hygiene requirements, using only food-safe sizing agents (such as modified starch) without harmful additives like heavy metals or formaldehyde. Uncoated kraft paper undergoes pulping, sizing, papermaking, and calendering, with no additional coating or laminating steps to avoid secondary contamination.
Domestic Standard: Complies with GB 4806.8-2016, restricting heavy metal migration (lead, cadmium ≤1.0mg/kg) and prohibiting fluorescent substances. Formaldehyde migration must be ≤30mg/kg, ensuring no odor or taste transfer to food.
International Standards: Meets FDA 21 CFR Part 176.170 (U.S.) and EC 1935/2004 + EN 645/648 (EU) for export products.
Labeling Requirement: Products must be marked "for food contact" with relevant certifications (e.g., QS/SC code in China, FDA logo for the U.S.), clearly indicating "virgin pulp" and "uncoated".
Safety and Purity: Without PE, PP, or wax coatings, uncoated kraft paper eliminates the risk of coating peeling and food contamination, perfect for organic foods and baby food.
Environmental Sustainability: Fully biodegradable (decomposes in 3-6 months in soil) and highly recyclable (over 95% recovery rate), aligning with global "plastic reduction" trends in the food industry.
Optimal Breathability: Natural gaps between fibers facilitate air circulation, preventing moisture buildup and mold growth in dry foods, thus preserving freshness and texture.
Natural Texture: Its inherent brown color and fiber grains convey a "natural, additive-free" brand image, ideal for organic grains, tea, and oil-free baked goods.
Cost-Effectiveness: The simplified production process (no coating) makes uncoated kraft paper more affordable than coated alternatives, reducing environmental disposal costs.
Weak Oil Resistance: Only blocks minimal surface oil (≤3% oil content, e.g., unflavored nuts). Visible oil or liquid grease (e.g., fried foods, pastries) will penetrate the paper within 1-3 minutes, causing leakage.
No Water Resistance: Absorbs moisture quickly in high-humidity environments (>65% RH) or when in contact with wet foods, leading to softening, wrinkling, and breakage.
Poor Heat Resistance: Above 60℃, fiber gaps expand, reducing toughness and oil resistance. It cannot wrap hot foods (e.g., freshly baked bread >90℃) as it will soften and lose shape.
Printing Restrictions: Without a coating, it absorbs ink easily but yields low color saturation. Only simple text or line logos are suitable, using food-grade water-based inks to avoid odor migration.
Dry grains: Rice, oats, red beans (moisture ≤15%), ideal for stand-up pouches or vacuum outer packaging.
Oil-free/low-oil baked goods: Oil-free cookies, whole wheat bread (cooled before packaging), benefiting from breathability to avoid staleness.
Unflavored nuts: Almonds, walnuts, peanuts (no visible oil), suitable for small independent packs.
Tea and herbs: Green tea, wolfberries, astragalus, preserving flavor without chemical residues.
Dried snacks: Dehydrated fruits (moisture ≤18%), oil-free rice crackers, maintaining crispness via breathability.
Slightly seasoned low-oil foods (3%-5% oil content): Use an inner layer of food-grade oil-proof paper or "uncoated kraft paper + thin PE film composite bags" to prevent oil penetration.
Long-term storage foods: Add desiccants and use sealed packaging (e.g., zip-lock bags), storing in environments with 50%-60% RH.
High-oil foods (≥5% oil content): Cakes, mooncakes, fried chicken, nut butters.
Wet/liquid-containing foods: Braised meat, seafood, soups, fresh fruits.
Hot foods: Freshly baked pastries, hot steamed buns.
Moisture-sensitive foods: Candy, chocolate, puffed snacks (require waterproof/airtight packaging).
Lightweight foods (<100g): 40-50g/㎡ (e.g., small tea bags, mini nut packs).
Medium-weight foods (100g-500g): 50-60g/㎡ (e.g., grains, bread).
Heavyweight foods (>500g): 60-80g/㎡ (e.g., bulk grains, gift boxes).
Request food-grade test reports to verify compliance with relevant standards.
Inspect for "food contact" labeling, natural brown color, and no peculiar odors or burrs.
Avoid direct contact with oil/liquid; use inner oil-proof paper for slightly oily foods.
Ensure foods are dry and cooled (<40℃) before packaging.
Store uncoated kraft paper in a dry, ventilated area (50%-60% RH) to prevent moisture absorption.
Use minimal food-grade water-based inks for printing, keeping designs simple and away from direct food contact areas.
Grain bags: 50-60g/㎡ stand-up pouches with zip-lock and desiccants.
Tea bags: 40-50g/㎡ small independent packs for freshness.
Bread wrapping paper: 55g/㎡ for cooled whole wheat bread, portable and natural.
Gift box inner lining: 60-80g/㎡ thick uncoated kraft paper for texture and cushioning.
Snack tray liners: 50g/㎡ to catch crumbs, easy to recycle.
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