Moisture Proof Sealed Plastic Boxe

Moisture-proof sealed plastic boxes effectively isolate external moisture and air through the comprehensive application of plastic material selection, structural design and sealing technology, protecting the contents from moisture and deterioration. Our factory is a manufacturer specializing in the production of various plastic boxes. The following mainly shares with you the relevant information about moisture-proof sealed plastic boxes.

1. Low moisture permeability material
High-density plastic material: HDPE (high-density polyethylene), PP (polypropylene) and other plastics with tight molecular structures are naturally low in moisture permeability, reducing water vapor penetration.
Multi-layer composite structure: Some high-end products use "PP+EVOH+PP" multi-layer co-extrusion technology, and the EVOH (ethylene-vinyl alcohol copolymer) barrier layer can greatly reduce the oxygen and moisture permeability.

2. Desiccant auxiliary
Some sealed boxes have built-in silica gel desiccant slots (such as the interlayer of the box cover) to actively absorb residual moisture in the box and enhance the moisture-proof effect.

1. Physical sealing structure
Silicone sealing ring: The edge of the box cover is embedded with an elastic silicone ring, which fits tightly to the box body after being compressed to block the entry of external air and moisture (similar to the sealing principle of a pressure cooker).
Buckle/lock design: Through multi-point buckles or rotating locking devices (such as Lock-and-Lock four-side locks), uniform pressure is applied to ensure that the sealing ring is fully compressed to avoid local air leakage.
-Double sealing system: High-end products use "main sealing ring + auxiliary sealing strip" double protection (such as refrigerator fresh-keeping boxes), even if the main seal is slightly aged, it can still maintain moisture-proof performance.

2. Air pressure balance technology
One-way exhaust valve: Some sealed boxes are equipped with a press-type exhaust valve, which is completely sealed when closed and can discharge excess air in the box when opened, reducing the sealing failure caused by internal negative pressure (suitable for freezing or high temperature environments).

1. Laboratory test standards
Moisture permeability test: In an environment with a temperature of 38°C and a humidity of 90%, the moisture permeability within 24 hours is measured (unit: g/m²·24h). The moisture permeability of a high-quality moisture-proof box is less than 5g.
Air tightness test: Immerse the sealed box in water and pressurize it to observe whether bubbles appear, or quantify the leakage value through a negative pressure detector.

2. Actual application performance
Food moisture-proof: In a humid environment, biscuits, milk powder, etc. in the sealed box can remain crisp for more than 30 days.
Electronic component protection: The humidity in the box can be controlled below 30%RH for a long time to prevent oxidation of precision components.

Correct closing method: Make sure that all the buckles are pressed tightly, and hear a "click" sound to confirm that they are in place.
Cleaning and maintenance: Avoid scrubbing the sealing ring with a steel wool ball, and regularly wipe the silicone strip with alcohol cotton pads to prevent aging.
Replacement cycle: It is recommended to replace the silicone seal every 1-2 years. If you find that the lid can still be easily pushed after closing, you need to check the sealing.

Outdoor moisture-proof: The sealed box for camping adds a waterproof rubber pad, which will not leak even if immersed in water for 1 hour.
Medical grade seal: It adopts medical grade silicone ring + ultrasonic welding process to meet the GMP storage standards for drugs.

Through the combination of material science + precision structural design, the moisture-proof sealed plastic box has achieved the evolution from "passive moisture-proof" to "active moisture control", becoming a rigid product in the fields of home, industry, and medical care.

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