Packaging: Carton
Productivity: 100,000 tons
Transportation: Ocean,Land,Air,Express
Place of Origin: china
Supply Ability: 100,000 tons
Certificate: Environmentally friendly green printing qualification
Port: dalian,tianjin,hunchun
Payment Type: L/C,T/T,D/P,D/A,Paypal
Incoterm: FOB,CFR,CIF,EXW
1、 Material specifications
（1） Kraft paper
• Weight: 80-250g/m ², with lower weights of 80-120g/m ² being lightweight and suitable for daily mail delivery; 150-250g/m ² kraft paper has high strength and good toughness, can withstand heavy documents, is wear-resistant and durable, and has a strong retro texture.
• Environmental friendliness: Made from natural wood pulp, recyclable and biodegradable, in line with environmental protection concepts, safe and reliable to use.
Waterproof: Ordinary kraft paper has weaker waterproof properties, but after special waterproof treatment, it can resist rainwater invasion to a certain extent and protect internal documents.
（2） Copperplate paper
Weight: 105-300g/m ², 105-157g/m ² Copperplate paper has a smooth surface and strong color expression, suitable for printing colorful patterns and text; 200-300g/m ² with a crisp texture, suitable for high-end invitations, etc., with a premium texture.
Glossiness: It is divided into glossy copperplate paper and matte copperplate paper. Glossy copperplate paper has bright and eye-catching colors, while matte copperplate paper is low-key and introverted, with good anti fingerprint effect.
Wear resistance: The coating is relatively thin and should be avoided from being scratched by sharp objects. Pay attention to protection during daily use to maintain a good appearance.
（3） Specialty paper
Weight: Depending on the category, it is generally between 120-350g/m ², such as pearlescent paper, patterned paper, etc. Each special paper has a unique texture and feel, which can add artistic atmosphere to envelopes.
• Uniqueness: It has a special touch, visual effect or functionality, such as luminous special paper emitting light in the dark, suitable for creative design customization.
Durability: Some specialty papers have high strength and wear resistance, but some have a brittle texture and should be used with caution.
2、 Size specifications
（1） Standard size
C5 envelope: 162mm × 229mm, commonly used for mailing regular letters and greeting cards.
B6 envelope: 176mm × 125mm, suitable for small promotional flyers, postcards, etc.
DL envelope: 220mm × 110mm, suitable for storing documents folded in A4 paper.
1. International envelope:
C4 envelope: 229mm × 324mm, used for mailing A4 sized documents such as contracts, reports, etc.
C6 envelope: 114mm × 162mm, suitable for postcards and small invitation letters.
（2） Customized size
We can customize envelopes of any size according to actual needs. The minimum size can be as low as 50mm × 70mm (suitable for small cards), and the maximum size can be flexibly customized according to paper specifications and process limitations to meet personalized usage scenarios.
3、 Printing process
（1） Offset printing
Color expression: Printed with CMYK four-color ink, high color reproduction, suitable for mass production, and low printing cost.
Printing accuracy: The dots are delicate and can present clear text and patterns, suitable for printing envelopes with conventional graphic and textual content.
Printing speed: Fast, able to efficiently complete orders, suitable for projects with tight deadlines and large quantities.
（2） Digital Printing
Flexibility: No need for plate making, can achieve fast prototyping and small batch customization, supports personalized graphic and textual design, and meets diverse customer needs.
Color transition: Excellent performance in gradient colors and complex patterns, with natural color transitions that can present rich visual effects.
Printing quality: In small-scale customization, high printing quality can be guaranteed, but the cost is relatively high in large-scale production.
（3） Hot stamping
• Craftsmanship effect: Multiple colors such as hot stamping, silver stamping, and red stamping can be selected to form metallic patterns or text on the surface of the envelope, enhancing the envelope's grade and suitable for high-end invitation letters,
holiday greeting cards, etc.
• Positioning accuracy: High precision hot stamping equipment is used to ensure accurate hot stamping positions and clear and complete patterns.
4、 Surface treatment process
（1） Laminated film
1. Light film: thickness 0.02-0.03mm, increases the glossiness of the envelope surface, makes the colors more vivid, and has waterproof, dustproof, and wear-resistant properties, extending the service life of the envelope.
2. Matte film: with a thickness of 0.02-0.03mm, it gives the envelope a soft texture, preventing fingerprints and scratches, making the envelope look more upscale.
（2） Embossed pattern
Press various textures on the surface of the envelope, such as cloth patterns, leather patterns, stripes, etc., to increase the tactile and visual layering of the envelope and enhance the artistic effect.
Different embossing techniques can create different styles to meet the diverse design needs of customers.
（3） UV local polishing
Apply UV gloss treatment to specific patterns or text areas on the envelope to create a high gloss finish, creating a sharp contrast with the surrounding area, highlighting key content, and enhancing visual appeal.
5、 Other parameters
（1） Sealing method
Adhesive sealing: using environmentally friendly water-based adhesive or hot melt adhesive, with strong adhesion and good sealing performance, to ensure the safety of the contents of the envelope.
Adhesive sealing: There is an adhesive strip attached to the seal of the envelope, which can be peeled off and pasted. It is convenient and fast to use, suitable for batch use.
Rope buckle sealing: Set a rope buckle at the opening of the envelope and fix it by winding it with a rope. It is retro and has a unique decorative effect, commonly used in high-end envelopes.
（2） Window design
Different shapes and sizes of windows can be opened on the front or side of the envelope, such as rectangular, circular, irregular, etc. The window size can be customized according to actual needs.
The window opening can be covered with a transparent film to protect internal information and facilitate the display of some contents of the documents inside the envelope, such as the recipient's address.
The above are detailed product parameters for customized envelopes. If you have special material, process, size and other requirements, please feel free to contact us at any time. We will provide you with professional customized solutions to create unique
envelope products.
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