In the field of packaging, plastic packaging bags occupy an important position with their diverse characteristics and wide applicability. Reasonable selection of plastic packaging bags should be comprehensively considered according to many factors such as product characteristics, use scenarios, and environmental protection requirements.

1. Selection based on product characteristics

Weight and shape: For products with large weight, such as rice, flour, etc., plastic bags with high strength and large thickness should be selected, such as bags made of high-density polyethylene (HDPE) material, which can withstand the pressure of heavier items and prevent breakage. Products with irregular shape or sharp corners, such as hardware tools, bone and meat, need to choose a bag with good flexibility and certain puncture resistance, such as linear low-density polyethylene (LLDPE) material, which can effectively resist the damage of the bag.

Physical and chemical properties: humidity sensitive products, such as electronic products, precision instruments, require packaging bags with good moisture resistance, can choose aluminum foil composite plastic packaging bags, the aluminum foil layer can effectively block water vapor. For products with active chemical properties, such as some drugs and cosmetics, plastic materials with strong chemical stability should be selected, such as polypropylene (PP), to avoid chemical reactions between packaging bags and products, affecting product quality.

2. The choice of combined use scenarios

Transportation and storage environment: If the product needs to be transported for a long distance or stored for a long time, the wear resistance and anti-aging performance of the packaging bag should be considered. In the outdoor environment, ultraviolet light will accelerate the aging of plastic, at this time you can choose to add anti-ultraviolet additives plastic bags, such as polyethylene materials containing carbon black, can extend the service life of the bag. In the storage environment, the stacking pressure is large, and it is necessary to choose a good pressure resistant packaging bag to ensure the integrity of the product packaging.

Frequency and convenience: For bags that need to be used multiple times, such as storage bags, durable and easy to open and close designs should be selected, such as zipper plastic storage bags, which are convenient for repeated use. Disposable packaging bags, such as food takeaway bags, can pay attention to cost control under the premise of meeting the packaging needs, and choose relatively thin and inexpensive plastic materials, such as ordinary polyethylene materials.

3. Choose according to environmental protection requirements

Recyclability: In the current era of increasing environmental awareness, priority is given to recyclable plastic bags. Common materials such as polyethylene (PE) and polypropylene (PP) can be effectively recycled and reused in areas with perfect recycling systems to reduce the generation of plastic waste. For example, many supermarket shopping bags are made of recyclable PE material, which is convenient for consumers to recycle after use.

Biodegradable: For some scenes with high environmental impact requirements, such as organic agricultural product packaging, biodegradable plastic bags can be selected. This kind of packaging bag can be decomposed by microorganisms in the natural environment, and eventually converted into harmless substances, which is friendly to the environment. Such as polylactic acid (PLA) material packaging bags, is a biodegradable new plastic, more and more used in the field of high-end environmental protection packaging.

The classification and selection of plastic packaging bags is a systematic project, which requires a comprehensive balance of product characteristics, use scenarios and environmental requirements, in order to achieve the best balance of packaging effect, cost effectiveness and environmental protection, and promote the sustainable development of the packaging industry.