How does the sealing performance of the envelope ensure the confidentiality of the contents of the letter through materials and processes?
Release Time : 2024-11-26
The sealing performance of the envelope is crucial to ensure the confidentiality of the contents of the letter.
1. Material selection
Paper material: Choose high-quality paper, such as kraft paper or moisture-proof paper. These papers have good toughness and moisture-proof properties, and can effectively prevent the external environment (such as moisture) from eroding the contents of the letter.
Adhesive: Use high-quality hot melt adhesive or animal glue. These adhesives can remain sticky when exposed to water or moisture, and are not easy to crack or fall off.
2. Process design
Sealing design: Envelopes usually adopt self-adhesive sealing or flap design. Self-adhesive sealing uses pre-coated adhesive. When the envelope is folded, the adhesive automatically adheres to ensure a tight seal. The flap design increases the sealing performance by pressing the external cover plate.
Double-layer sealing: Some high-end envelopes adopt a double-layer sealing design, that is, a layer of sealing material is added inside the envelope. When the envelope is sealed, the internal material is tightly combined with the external paper to further enhance the sealing performance.
Anti-counterfeiting design: Some envelopes are designed with anti-counterfeiting logos or barcodes at the seal. Once the seal is broken, the logo will be destroyed, thus preventing the letter from being opened by unauthorized personnel.
3. Special treatment
Waterproof treatment: Waterproof the envelope, such as applying a waterproof coating on the surface of the paper to prevent the letter from getting damp in a humid environment.
Anti-counterfeiting ink: Anti-counterfeiting ink is used to print on the seal of the envelope. This ink will show a special pattern or color under specific light. Once the seal is broken, the pattern or color will disappear, playing an anti-counterfeiting role.
4. Testing and certification
Sealing performance test: During the production process, the envelope is tested for sealing performance, such as tensile strength test, compression test, etc., to ensure the sealing performance of the envelope under normal use conditions.
Through the above comprehensive measures such as material selection, process design, special treatment, testing and certification, the sealing performance of the envelope is effectively guaranteed, thereby ensuring the confidentiality of the content of the letter.
1. Material selection
Paper material: Choose high-quality paper, such as kraft paper or moisture-proof paper. These papers have good toughness and moisture-proof properties, and can effectively prevent the external environment (such as moisture) from eroding the contents of the letter.
Adhesive: Use high-quality hot melt adhesive or animal glue. These adhesives can remain sticky when exposed to water or moisture, and are not easy to crack or fall off.
2. Process design
Sealing design: Envelopes usually adopt self-adhesive sealing or flap design. Self-adhesive sealing uses pre-coated adhesive. When the envelope is folded, the adhesive automatically adheres to ensure a tight seal. The flap design increases the sealing performance by pressing the external cover plate.
Double-layer sealing: Some high-end envelopes adopt a double-layer sealing design, that is, a layer of sealing material is added inside the envelope. When the envelope is sealed, the internal material is tightly combined with the external paper to further enhance the sealing performance.
Anti-counterfeiting design: Some envelopes are designed with anti-counterfeiting logos or barcodes at the seal. Once the seal is broken, the logo will be destroyed, thus preventing the letter from being opened by unauthorized personnel.
3. Special treatment
Waterproof treatment: Waterproof the envelope, such as applying a waterproof coating on the surface of the paper to prevent the letter from getting damp in a humid environment.
Anti-counterfeiting ink: Anti-counterfeiting ink is used to print on the seal of the envelope. This ink will show a special pattern or color under specific light. Once the seal is broken, the pattern or color will disappear, playing an anti-counterfeiting role.
4. Testing and certification
Sealing performance test: During the production process, the envelope is tested for sealing performance, such as tensile strength test, compression test, etc., to ensure the sealing performance of the envelope under normal use conditions.
Through the above comprehensive measures such as material selection, process design, special treatment, testing and certification, the sealing performance of the envelope is effectively guaranteed, thereby ensuring the confidentiality of the content of the letter.