Do you know how kraft paper envelope bags are produced?

The production process of kraft paper envelope bags involves several steps, from the preparation of raw materials to the completion of the final product. Below are the main steps involved in the production of kraft paper envelope bags:

1. Raw Material Preparation

Kraft Paper: The base material for producing kraft paper envelope bags is kraft paper, which is usually made from wood pulp or recycled paper pulp through specific processes (such as chemical treatment and pulp grinding). Kraft paper is known for its toughness, durability, and high tensile strength.Other Auxiliary     

Materials: If waterproof or tear-resistant features are needed, special coatings, films, or treatments may be added. For printing, suitable inks and coatings will be prepared.

2. Design and Mold Making

Design: Based on customer requirements, designers create blueprints for the envelope bag, including size, shape, closure method, and print design. The design also includes whether personalized printing (such as logos, patterns, or text) is needed.

Mold Making: For mass production, special molds or templates may be made to ensure that each bag has consistent size and shape.

3. Paper Processing and Cutting

Cutting: The kraft paper is cut into appropriate sizes, usually based on the required envelope bag dimensions. For standard envelope bags, rectangular paper pieces are cut.

Surface Treatment: After cutting, the kraft paper may undergo further processing, such as embossing, coating, or applying a layer of waterproof coating (such as a PE film) to improve the bag's waterproof and durability properties.

4. Printing and Decoration

Printing: If the customer requests printing of patterns, logos, or text on the kraft paper envelope bag, printing technology (such as offset or flexographic printing) will be used. Depending on the design, either single-color or multi-color printing may be applied.

Drying: After printing, the paper will be dried using drying equipment to ensure the print quality is clean and durable.

5. Forming and Sealing

Folding and Forming: The cut kraft paper is folded into the shape of the envelope bag, with the edges aligned, and folding operations are performed. Common envelope bag designs include bottom-sealed or side-sealed types.

Sealing: The envelope bag's closure is typically sealed with glue or heat sealing to ensure a secure seal. For certain designs, self-adhesive closures (such as applying adhesive or using a self-adhesive strip on the opening) may be used for ease of use by customers.

6. Quality Inspection

Size Inspection: Ensure that each envelope bag meets the size requirements and does not have deviations.

Appearance Inspection: Check the print quality, smoothness of the paper, and whether there are any noticeable wrinkles, damage, or irregularities.

Functionality Check: If special features like waterproofing or tear-resistance are needed, the manufacturer will conduct relevant tests to ensure the bags meet the required standards.

7. Packaging and Shipping

Packaging: Once all the kraft paper envelope bags are completed, they are packaged in quantities, usually in cardboard boxes or other eco-friendly materials to prevent damage.

Labeling and Shipping: Finally, the envelope bags are labeled with batch numbers, production dates, and other information before being shipped out.

8. After-Sales Service

Quality Feedback: Manufacturers ensure that the products received by customers meet the agreed requirements and provide after-sales service. If there are any quality issues, the manufacturer will address them promptly.

Summary

The production process of kraft paper envelope bags includes multiple stages, such as raw material preparation, design, cutting, printing, forming, sealing, quality inspection, and packaging. The entire process emphasizes environmental protection, durability, functionality, and aesthetics, resulting in customized kraft paper envelope bags that meet customer needs.

For sample or more packaging customization needs, please contact us

About us

Zeal X’s Kraft Paper Envelope Bags offer full customization and a one-stop packaging solution. Our product range includes various types of boxes, high-end handmade boxes, labels, plastic bags, and a variety of biodegradable, recyclable packaging materials. Our products are certified by GRS, FSC, REACH, BHT, and more.