Sealed bags also refer to ziplock bags, which are made of materials such as plastic single film composite film. After filling or taking out the contents, the bag can be repeatedly sealed and opened through the ridges and grooves at the opening. According to the purpose, it is divided into food packaging bags and non-food packaging bags. Because of its strong self-sealing effect, good airtightness, easy to carry, can be opened and sealed repeatedly, and can keep the items in the bag hygienic, it is widely used in the packaging of various products.

Compostable ziplock bags can be used for the inner and outer packaging of various small items (ornaments, small hardware, toys), and can be used for the packaging of clothing and other daily necessities. Biodegradable ziplock bags produced with food-grade raw materials can also store various small foods, tea, seafood, etc., moisture-proof, anti-odor, waterproof, insect-proof, prevent items from scattering, ensure that food is stored in a relatively suitable oxygen and water content environment, and block dust and bacteria in the air, thereby extending the shelf life of food and delaying food deterioration. How can consumers choose and buy correctly?

01 Look at the appearance
First of all, the appearance of the product should not have bubbles, perforations or ruptures. In addition, if there are printed images on the surface of the ziplock bag, the clarity of the printed images needs to be visually inspected. You can rub the outer packaging bag back and forth several times with your hands to observe whether the printed pattern fades. If the pattern is unclear, the overprint error is too large, it is easy to fade or there is de-inking, then the product may have certain quality problems.

02 Check the ziplock
Consumers can manually operate the ridges and grooves at the opening, repeatedly seal and open the ziplock to check the tightness and repeated use of the ziplock. If the ziplock is too loose or too tight, it will affect the use.

03 Check the smell
When buying ziplock bags, consumers should use their sense of smell to detect whether the bag has a pungent organic solvent smell. This smell may come from the printing of inferior ink or the volatilization of the additives of the plastic material itself.

04 Size of ziplock bags
Sealed bags have different sizes. Consumers should pay attention to check the product information when purchasing and choose different sizes according to the items to be stored.

05 Only food-grade sealed bags can be used to hold food
The state implements industrial product production license supervision for food-related products with higher risks, such as plastic packaging materials for direct contact with food. Enterprises must meet production conditions and obtain industrial product production licenses for related products before they can produce. The production license mark consists of the Chinese characters "QS" and "production license". It can be used for food contact sealed bag products or their packaging and instructions. The production license mark and number should be marked.

06 Product use
During the use of reusable food contact sealed bag products, pay attention to the cleaning and maintenance of the sealed bag to avoid damage and food microbial contamination; judge whether it can be used in high temperature or microwave ovens according to the product packaging instructions, and use it according to the product's nominal use temperature.