Paper Bags and Felt Bags: Eco-Friendly Partners with Similar Materials but Distinct Functions
2025-10-24
1、 Material similarity:
The core commonality between white cardboard bags and felt bags lies in the disordered interwoven structure of fibers, which endows both with similar physical properties.
- Paper bag: Made from plant fibers (such as wood pulp and bamboo pulp) through pulping and papermaking processes, the fibers are bonded together through hydrogen bonding and physical entanglement, forming a dense but non well-defined sheet-like structure.
- Felt cloth bag: usually made of wool, polyester fibers, etc. through stacking, needle punching, or hot melt processes, with randomly interwoven fibers, also lacking the warp and weft lines of traditional fabrics.
2、 Functional differences:
Although the materials are similar, the functional designs of the two are completely different, with the core differences reflected in load-bearing capacity, durability, and application scenarios.
（1）Load bearing and durability:
- Paper bag: Taking kraft paper as an example, its tear resistance strength can reach 20-30N/15mm (horizontal), and it can bear short-term loads of up to 5kg (such as clothing and dry goods) without pressure.
- Felt cloth bag: The force between fibers is weak, and the tear resistance is usually less than 10N/15mm. It is easy to break after repeated friction. Even with the addition of chemical fiber reinforcement, it is only suitable for carrying light objects weighing 1-2kg.
（2）Environmental adaptability:
- Paper bag: Its natural moisture absorption makes it easy to soften and deform in humid environments. To improve moisture resistance, PE coating process (such as food grade coated paper) is often used, but the coating layer will hinder natural degradation and requires high-temperature composting conditions.
- Felt cloth bag: Waterproof depends on the fiber material (such as polyester felt, which can temporarily prevent splashing, while wool felt is easy to absorb water). The overall moisture resistance is weaker than that of coated paper bags, and it is not naturally degradable. Recycling relies on a chemical fiber recycling system.
（3）Application Scenario:
- Paper bag: With low cost and high printing adaptability, it has become the mainstream choice for product packaging.
- Felt cloth bag: Due to its softness and strong plasticity, it is often used in handicrafts, insulation pads, decorative materials, and other scenes. For example, wool felt bags can be made into doll storage bags, while polyester felt bags are often used as DIY materials for creativity.
3、 Environmental perspective:
From an environmental perspective, both are superior to plastic bags, but with different paths:
- Paper bag: The production process has low carbon emissions (about 1/3 of plastic bags) and is naturally biodegradable (when not coated), making it suitable for short-term and high-frequency commodity packaging needs.
- Felt cloth bag: If made of natural wool material, it is biodegradable; If it contains synthetic fibers, it is necessary to reduce pollution through recycling and reuse. Its advantage lies in its long-term use value, but the actual recovery rate is limited due to classification difficulties.
The "same material, different uses" of paper bags and felt bags is a manifestation of material science adapting to local conditions. When making a choice, one can follow the principle of "choosing paper bags for short-term light load and felt for creative decoration", allowing environmental protection and practicality to go hand in hand.
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