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Three common rice packaging methods
**Rice Packaging: Materials and Techniques**
According to Chinese Packaging Network, the form of rice packaging is largely determined by the type of materials used. Commonly used rice packaging materials include plastic woven bags and composite plastic bags. As a result, rice packaging can be categorized into three main types: regular packaging, vacuum packaging, and inflatable packaging. Regular packaging typically uses plastic woven bags, while vacuum and inflatable packaging are made from composite plastic bags.
**1. Regular Rice Packaging**
Regular rice packaging usually involves sealing rice in a polypropylene or similar material plastic woven bag. This method does not involve any advanced preservation techniques. The effectiveness of this packaging in preventing pests, mold, and spoilage is limited, and it mainly serves the purpose of containing the product. However, due to the high tensile strength of plastic woven bags, they are often used for heavy packaging, with a shelf life of about three months.
Plastic woven bags are made from narrow strips of plastic film or strong, low-elongation braids that are heat-stretched. These bags are much stronger than regular plastic film bags, resistant to deformation, and offer good impact resistance. Their woven surface also improves non-slip performance, making them ideal for stacking during storage. Most rice packages weighing over 5kg are made from these woven bags.
However, one major drawback of using plastic woven bags is their poor moisture resistance and barrier properties. This makes the rice more prone to oxidation, mold, and insect infestation, especially during summer when storage conditions are less favorable.
**2. Vacuum Packaging of Rice**
Vacuum packaging is an effective method to extend the shelf life of rice. By reducing the oxygen concentration inside the package, it inhibits the respiration of rice grains and limits the growth of mold and insects. The typical vacuum level for rice packaging ranges between -0.07 to -0.09 kPa. However, due to the high degree of vacuum, the packaging material may be punctured by the rice grains, leading to a failure in the vacuum seal.
During transportation, friction, collisions, and drops between packages can also cause the bags to break. Therefore, it's important to consider both the packaging technique and the distribution environment to ensure optimal results.
**3. Inflatable Packaging of Rice**
Inflatable packaging typically involves filling the package with gases like COâ‚‚ and Nâ‚‚, which are colorless, odorless, and non-toxic. These gases have stable chemical properties and can help maintain the quality of rice. COâ‚‚ has the ability to adsorb onto the rice surface, creating a protective layer that puts the rice in a "sleep" state, minimizing changes in fatty acids, total acidity, and viscosity. Nitrogen helps reduce oxygen levels, which is beneficial in preventing microbial growth and maintaining quality.
Most studies suggest that inflatable packaging is effective in preserving rice quality and preventing mold and insect infestations. Composite plastic bags used for vacuum and inflatable packaging are made from high-barrier materials such as EVOH, PVDC, PET, PA, PE, and PP. These materials provide better moisture, mold, and insect resistance compared to plastic woven bags. Additionally, they allow for clear printing of logos, text, and barcodes, which helps attract customers and boost sales.
Most rice packages under 5kg are packed in composite plastic bags. These bags are usually sealed using heat-sealing after vacuum or inflation processes. Due to the compactness of the material and the treatment applied, issues like mold and insect infestation are significantly reduced. However, there are some challenges, such as wrinkling during sealing, which can affect the appearance of the bag. Also, the compressive strength of composite bags is lower, and some inflated packages may rupture during transport, affecting the rice’s shelf life.
Moreover, composite plastic bags are not easily biodegradable, and their disposal can be problematic. Plastic products can also pose health risks, leading to certain restrictions on their use.
The choice of packaging material directly influences the type of rice packaging used. With ongoing advancements in technology, it is expected that rice packaging materials will continue to improve, resulting in more diverse and efficient packaging solutions. For more updates, keep an eye on Chinese Packaging Network!