Biodegradable Kraft Paper Seed Bags with Inner PE Liner – Breathable & Anti-Mold for Grain Storage – Custom Printing

Product Overview: 
This product is a biodegradable kraft paper seed bag, featuring a high-quality, natural kraft paper outer layer and a composite, biodegradable PE inner liner, specifically designed for the storage and packaging of grains and seeds. The kraft paper layer is naturally biodegradable, making it environmentally friendly and pollution-free; the PE inner liner provides moisture-proof protection while incorporating microporous breathability to prevent mold and maintain seed viability. Custom printing is available, making this bag ideal for grain storage, seed packaging, and eco-friendly packaging needs across a wide range of grain products.

Applicable materials: 
Grain seeds (corn, wheat, rice, sorghum, barley, oats), legume seeds (soybeans, mung beans, adzuki beans, peanuts), vegetable seeds, coarse grains (millet, brown rice, buckwheat), and other agricultural products that require breathable storage.

Core Advantages: 
Biodegradable, eco-friendly, and pollution-free; natural kraft paper texture; PE-lined interior for moisture resistance, breathability, and mildew prevention to maintain seed viability; ideal for long-term grain storage; customizable printing available; aligns with the trend toward sustainable packaging.

Biodegradable (environmentally friendly property): 
The outer kraft paper layer is made from virgin wood pulp and is biodegradable in natural environments, ultimately breaking down into organic matter without contributing to white pollution. The inner PE film features a biodegradable formulation that accelerates decomposition under specific conditions—namely, exposure to light, heat and oxygen, and biological environments. This product complies with both domestic and international eco-friendly packaging standards and sustainability requirements, making it suitable for export to regions with stringent environmental packaging regulations, such as the European Union and North America.

Natural kraft paper texture: 
The outer layer is made of high-quality, natural kraft paper, available in basis weights ranging from 80 to 120 grams per square meter. The kraft paper features a natural, rustic texture and color, conveying a brand image that is natural, healthy, and environmentally friendly. It boasts high strength and excellent tear resistance, offering a more organic feel compared with woven bags. The surface is writable and supports inkjet printing for labeling production dates and batch numbers.

Moisture-proof PE liner: 
The inner-layer composite biodegradable PE film reduces water vapor transmission by more than 90%, effectively preventing grain and seed moisture absorption, mold growth, spoilage, and loss of viability. The PE film is firmly laminated to kraft paper, with no risk of delamination or peeling. Optional PE film thicknesses are available to meet varying moisture-barrier requirements.

Breathability and mildew resistance (core technology): 
To meet the specific requirements of grain seed storage, this product employs a laser micro-perforation process to pre-create tiny pores in the bag wall, with pore diameters ranging from 0.3 to 0.5 millimeters. The number of pores can be customized based on the seed variety and desired storage duration. This micro-perforation design allows for minimal air exchange within the bag, effectively removing carbon dioxide and heat generated by seed respiration while preventing excessive moisture buildup that could lead to mold growth. By striking an optimal balance between breathability and moisture control, the product ensures that seeds maintain their viability and germination rate throughout the storage period.

Microporous breathable technology addresses the issues of oxygen deficiency, carbon dioxide accumulation, and reduced germination rates caused by traditional airtight packaging, while also eliminating the risk of moisture-induced mold growth associated with fully permeable packaging. This product is particularly well suited for the storage of high-respiration-rate grain seeds such as cereals, corn, wheat, and rice.

Mold resistance: 
Breathable micro-pores regulate the humidity balance between the inside and outside of the bag, effectively preventing excessive moisture buildup within. Combined with the moisture-barrier properties of the PE inner liner, this dual-layer protection effectively inhibits mold growth. Testing has shown that, under standard storage conditions, grain seeds stored in this product exhibit a mold incidence rate of less than 1% over a six-month period.

Material and Craftsmanship: 
The outer layer is made of biodegradable kraft paper with a basis weight of 80 to 120 grams per square meter. The inner layer is a biodegradable PE film. The structure is a two-layer composite of kraft paper and PE film. Bag styles include flat bags or M-seal bags, with options for heat-sealed or sewn bottoms. Printing is carried out using environmentally friendly water-based inks via flexographic or gravure printing. The透气 (breathability) process involves laser micro-perforation, with hole diameters ranging from 0.3 to 0.5 millimeters and a customizable hole count.

Eco-friendly ink printing: 
Printed using eco-friendly water-based inks that are free of heavy metals and harmful solvents. The printed designs are sharp and the colors are natural, meeting the needs of brand promotion and label identification.

Printable content includes the brand logo, product name (e.g., grain seeds, corn seeds, wheat seeds), variety name, net content, four quality parameters—purity, cleanliness, germination rate, and moisture content—implementation standard number, seed production and business license number, variety approval number, testing date, shelf life, storage conditions (“store in a cool, dry, and well-ventilated place”), planting instructions, barcodes and QR codes (supporting scan-based traceability), environmental protection labels (recyclable, biodegradable), and warning labels (“moisture-proof,” “sun-proof,” “keep out of reach of children”).

Tensile strength: 
Testing has shown that the tensile strength exceeds 400 newtons per 50 millimeters, enabling the bag to support between 1 and 25 kilograms of grain seeds and meeting the requirements for stacking and transportation during seed packaging.

Packaging drop test: 
Under a 25 kg load condition, the product passed a 1.2-meter free-fall test with no breakage and no leakage on any of its six sides.

Sealing method: 
After filling, heat-sealing closure is available; when combined with a PE liner film, it provides excellent sealing performance. Alternatively, a bag-sewing machine can be used for line-seam sealing with an inner liner, or a tie-strap closure can be employed for small packages.

Applicable filling method: 
Compatible with screw fillers, gravity fillers, seed-specific metering fillers, and manual filling.

Packaging specifications: 
The bagging weight can be customized to 1 kg, 2.5 kg, 5 kg, 10 kg, 15 kg, 20 kg, 25 kg, and other specifications. Bag dimensions are tailored according to the bagging weight and customer requirements. Bag styles include flat-bottom bags or M-seam bags. Bottom types can be heat-sealed or sewn. Kraft paper basis weights are available in 80 g/m², 100 g/m², and 120 g/m². Breathable holes can be customized in diameter and number based on seed variety and storage duration.

Custom Services: 
The customization process comprises requirement consultation, design and sample production, functional configuration, mass production, and delivery and acceptance. First, the seed type, fill weight, and brand positioning are confirmed. Upon receipt of the client’s brand visual identity guidelines and print design files, a sample is produced for approval. Once functional options such as kraft paper basis weight, PE film thickness, and vent-hole design have been finalized, full-scale production is scheduled. Subsequently, goods are shipped according to the agreed delivery schedule, and payment is settled upon successful acceptance.

Customization options cover dimensions (length and width tailored to the weight of the packaged material), bag styles (flat bags, M-seal bags), printing (using eco-friendly water-based inks, in single or multiple colors), kraft paper basis weight (80 g/m², 100 g/m², 120 g/m²), PE film thickness (customizable), vent holes (hole diameter from 0.3 to 0.5 mm, with customizable hole count), and bottom style (heat-sealed bottom, sewn bottom).

Environmental Compliance: 
This product complies with both domestic and international eco-friendly packaging standards: the kraft paper layer is biodegradable, and the PE film is formulated with biodegradable ingredients. We can provide relevant environmental certifications and export qualifications to meet market access requirements in the EU, North America, and other regions.

Applicable to: 
This product is suitable for grain seed producers, grain seed processing enterprises, seed multiplication bases, coarse grain farmers, organic agricultural product brands, seed export traders, and purchasers of eco-friendly packaging.

Price and MOQ: 
Specific pricing and MOQ are negotiable.