Courier Poly Mailing Bags

Postal envelopes are essential for sending letters, documents, goods and various shipments. With the expansion of online businesses and the increase in the sending of postal items, the use of quality and durable postal envelopes has become more common. This article examines the types of postal envelopes, including polyethylene brochure envelopes, plastic postal envelopes, nylon shipping envelopes and other widely used models.

Plastic mailing envelope sizes

Mailing envelope sizes are exactly the same as paper size standards. Some of the most important and recommended sizes are:

• A5 : 15×20
• A4: 20×30
• A3: 30×40
• A2: 40×60
• A1: 60×85

Checking the thickness of postal envelopes

Light weight and lightness are one of the most important points in the production of postal envelopes, and for this reason, postal envelopes are often produced and printed with relatively low thicknesses.

Common and general thicknesses 70 microns

Special thicknesses produced in the Pack Polymer collection include

• 35 microns
• 40 microns
• 50 microns
• 60 microns
• 70 microns
• 80 microns
• and other thicknessesIs the thickness of the postal envelope different in other countries? The thickness of other countries is usually thin, which includes 35 microns, 40 microns and 50 microns.

Production with 3 and 7 layer machines

Pack Polymer Company uses the most up-to-date 3 and 78 layer polyethylene film production machines with a combination of dedicated materials to produce postal envelopes of the highest quality. Up-to-date production machines and a precise combination of raw materials result in the production of self-adhesive envelopes of the highest quality.

The flyer envelope is designed for single use only.

Postal envelopes, or polyethylene flyer envelopes, are untraceable. Due to the use of very strong adhesive, in such a way that to open the flyer envelope, the envelope must be torn, so ordinary adhesives are not used.

The adhesive technology is very modern and special, unique to Pack Polymer.

Flyer envelope seal adhesive material

Hot melt adhesive with a temperature of 180 degrees is used to seal the lid of these flyer envelopes. The hot melt adhesive has a protective layer that should be easily released when the envelope is used, that is, after removing the protective layer from the adhesive, and should not stick to the adhesive.

The material of the adhesive protective layer is polyethylene, polypropylene, metallized, polyester, etc. The thickness of these films is customized from 25 microns to 40 microns based on customer request.

Features of Pack Polymer mailing envelopes

Due to their functional nature, mailing envelopes must have certain features, some of which include:

• Waterproof
• High resistance to tearing
• Very strong stitching with state-of-the-art technology
• Various colors of flyer envelopes

Design and printing of mailing envelopes

Pack Polymer Company uses the most up-to-date machinery capable of printing on single-sided and double-sided mailing envelopes from 1 to 8 colors with the highest quality flexo machinery specifically for printing on polyethylene films.

Types of envelopes and their uses

1. Polyethylene flyer envelope (post flyer envelope)

Polyethylene flyer envelopes are one of the most widely used types of mailing envelopes, made of durable polyethylene. These envelopes are lightweight, waterproof, and durable and are used to send letters, documents, catalogs, and brochures.

Flyer envelope features:

• Tear and moisture resistant
• High quality printing capability (2-color, 3-color, 4-color, 5-color, and even 6-color printing)
• Suitable for sending promotional items

2. Plastic mail envelope

This type of envelope is made of thin or thick plastic and is suitable for sending light goods and letters.

Advantages of plastic mail envelopes:

• Lightweight and economical
• Resistant to water and dust penetration
• Ability to produce in different sizes

3. Shipping Envelope (Nylon Shipping Envelope)

Nylon shipping envelopes are used to ship small and medium-sized items. These envelopes are made of high-quality nylon and are available in two types: thin and thick.

Applications of nylon postal envelopes:

• Shipping products from online stores (online shops)
• Packaging cosmetics, books and documents
• Suitable for sending anti-theft packages

4. Printed mailing envelope

Printed envelopes are usually used for promotional purposes and can be printed with custom designs and logos.

Types of printing on nylon envelopes:

• 2-color printing (suitable for simple designs)
• 4-color printing (CMYK for color designs)
• 6-color printing (for higher quality and clarity)

5. Envelope for sending letters and documents

These envelopes are usually made of paper or plastic and are used for sending office and personal letters.

Features of mailing envelopes:

• High security for important documents
• Ability to use confidential mailing envelopes
• Ability to use self-adhesive envelopes to prevent unauthorized access

6. Self-adhesive envelope (sealed envelope)

Self-adhesive envelopes have a high level of security due to their sealed lid and are suitable for sending sensitive documents and valuable goods.

Advantages of self-adhesive envelopes:

• Prevents unauthorized opening of the envelope
• Ease of packaging and shipping
• Can be used as self-adhesive promotional envelopes

7. Tamper-proof Mailing Envelopes

These envelopes are specially designed and manufactured from durable materials to prevent unauthorized access to the contents inside the envelope.

8. Two-tone polyethylene mailing envelopes

In addition to being highly durable, two-tone envelopes have an attractive appearance and are used for sending special and promotional items.

9. Printed Handled Envelope

This type of envelope has a handle for easier carrying and is usually used to send catalogs, magazines, and product samples.

10. Cellophane Mailing Envelopes

Cellophane envelopes are transparent and allow you to see the contents inside. These envelopes are perfect for displaying small products.

11. Plastic Mailing Bags

Plastic mailing bags come in various sizes and are used for shipping clothing, small electronics, and other goods.

12. Online Shop Shipping Envelopes

With the increase in online sales, special envelopes have been designed for shipping online shop products that are durable, lightweight, and printable with the store’s logo.

13. Thin and thick nylon mailing envelopes

Depending on the type of item, thin nylon envelopes (for light items) or thick envelopes (for heavier items) can be used.

Complete knowledge of materials and types of postal envelopes

1.1 Polyethylene: The King of Mailing Envelope Materials

Polyethylene flyer envelopes are one of the most widely used types of mailing envelopes. These materials have unique properties:

• Density: High-density polyethylene (HDPE) and low-density polyethylene (LDPE)
• Thickness: From 40 microns to 200 microns
• Advantages: Tear resistance, impermeability to moisture, high flexibility
• Disadvantages: High heat sensitivity, non-degradable in the environment

1.2 Nylon: A strong and durable option

Nylon bags are especially suitable for shipping medium-value goods:

• Types: Bubble wrap, plain nylon, thick nylon
• Applications: Shipping sharp goods, packaging industrial products
• Advantage: High tensile strength up to 3 times that of regular polyethylene

1.3 Composite Plastics: Innovation in the Packaging Industry

New composites such as polypropylene (PP) and polyester (PET) are entering the market:

• Properties: High transparency, better heat resistance
• Application: Cellophane bags for product display

Specialized review of types of mailing envelopes

2.1 Flyer envelopes

These envelopes are specially designed for sending promotional materials:

• Standard dimensions: from A6 (105 × 148 mm) to A4 (210 × 297 mm)
• Optimum thickness: 80-120 microns for a balance between strength and weight
• Printing features: Supports high-resolution offset and digital printing

2.2 Confidential and Anti-Theft Mailing Envelopes

Designed for sensitive and valuable documents:

Security technologies:

• Tear-off strips
• Hide-away layers
• Invisible UV prints
• Unique serial numbers

2.3 Online Shop Shipping Envelopes

Designed specifically for online businesses:

Key Features:

• Multi-layer envelopes with inner protective layer
• Easy-Open design for the customer
• Dedicated space for invoice and promotional message
• Ability to install barcode and QR Code labels

Standards and Technical Considerations

4.1 International Standards

• ISO 187: Tear Resistance Standard
• ASTM D882: Tensile Testing of Materials
• DIN 53100: Printing Standards

4.2 Environmental Considerations

Degradable Materials: PLA (Polylactic Acid)

Sustainable Approaches:

• Thickness Reduction Without Loss of Strength
• Use of Plant-Based Inks
• Dedicated Recycling Systems

Guide to choosing the right mailing envelope

Conclusion

Choosing the right envelope depends on the type of item, weight, and security requirements. Polyethylene flyer envelopes, plastic mailing envelopes, nylon envelopes, and self-adhesive envelopes are some of the most commonly used types of envelopes, each with its own advantages. With the growth of online businesses, using high-quality, printed envelopes can help improve branding and shipping security.

If you are planning to purchase a mailing envelope, be sure to pay attention to its material, size, and printing capabilities to choose the best option for your needs.

Choosing the right envelope requires consideration of several factors:

1. Nature of contents: Documents, physical goods or promotional materials
2. Security considerations: Need for anti-theft features
3. Environmental considerations: Use of biodegradable materials
4. Promotional objectives: Utilize print space for branding

Given the dramatic growth of e-commerce, investing in quality mailing envelopes is not just a cost, but an investment in brand reputation and customer satisfaction.