Comprehensive analysis of kraft paper packaging bag production equipment: from technical parameters to purchasing guide

With the increasing awareness of environmental protection and the transformation and upgrading of the packaging industry, kraft paper packaging bags are becoming increasingly popular due to their recyclable and biodegradable properties, and market demand continues to grow. This article will comprehensively introduce the various equipment required to produce kraft paper packaging bags and their technical characteristics.

As an important representative of environmentally friendly packaging, kraft paper packaging bags have been widely used in many fields such as gifts, clothing, food, chemical products, etc. Its production process requires the use of specialized equipment, and different bag types and production requirements require different mechanical equipment.

This article will give you a comprehensive analysis of the types, technical parameters and purchase considerations of kraft paper packaging bag production equipment to help you gain a deeper understanding of this industry.

1. The main types of kraft paper packaging bags

Before producing equipment, we need to understand the main types of kraft paper packaging bags. Different types require different production equipment:

1. Ordinary kraft paper flat bags : used for general packaging such as clothing and retail;
2. Multi-layer kraft paper bags : used for heavy packaging of chemicals, building materials, grain, etc.
3. Kraft paper bubble film envelope bag : used for packaging of electronic products, fragile items, etc. that require cushioning protection;
4. Composite film kraft paper bag : used for high-end packaging that needs to be moisture-proof and humidity-proof;

2. Classification of kraft paper packaging bag production equipment

1. Multi-layer kraft paper tube making machine

The multi-layer kraft paper tube making machine is the core equipment for producing heavy-duty packaging paper bags. It is mainly used to make the tube part of multi-layer kraft paper bags used in chemical, cement, grain and other industries.

Technical Features : It adopts variable frequency speed regulation and servo system PLC control, can be set to any length without changing gears, and has automatic color tracking function. It has complete functions such as automatic gluing, molding, pulling, photoelectric sensing, arbitrary length setting, cutting, counting, and output.

Process flow : coiling → feeding → layering → gluing → forming → multi-layer traction → cutting (fixed length) → breaking → photoelectric counting → whole bag conveying → finished product.

Typical technical parameters :

• Paper weight : 70-200g
• Bag making length : unlimited (touch screen control, servo-controlled and arbitrary fixed length)
• Bag making width : 400-720mm (can make "M" edge, folding width is adjustable)
• Coil width : 620-1250mm
• Number of bag making layers : 1-5 layers (can be customized according to customer requirements)
• Bag making line speed : 65-70 m/min
• Machine power : 12-13kw
• Working voltage : 380±10V 50HZ 3-phase 4-wire or 5-wire

2. Fully automatic kraft paper bubble film envelope bag making machine

This type of equipment is specially used to produce kraft paper bubble film envelopes with cushioning protection functions, and is widely used in the packaging of fragile items such as electronic products, ceramic glass products, and precision instruments.

Technical Features : Using advanced motion control technology, the whole process from unwinding to cutting and forming is controlled by computer. The bags produced are smooth and beautiful, with strong and reliable bonding and simple and convenient operation.

Production process : The coated kraft paper and PE bubble film are bonded by hot rollers, then the material is folded in half, sealed by heat pressing, and finally cut into envelope bags.

Typical technical parameters :

• Applicable materials : laminated kraft paper, bubble film, adhesive strips
• Maximum unwinding diameter : paper diameter ≤ 600mm, bubble film diameter ≤ 1200mm
• Maximum unwinding width : paper ≤ 1150mm, bubble film ≤ 1100mm
• Maximum bag size : length ≤600-700mm, width ≤400mm
• Bag making speed : 30-120 pieces/min (speed can be doubled for small bags)
• Machine power : about 20KW
• Working voltage : 3-phase 380V 50Hz
• Machine weight : about 4T
• Machine size : about 10000×2100×2000 mm

3. Paper bag bottom gluing equipment

The finished paper bag tube needs further bottom processing to become a complete packaging bag. According to the different bottom shapes, it can be divided into bottom sewing equipment and bottom gluing equipment.

Technical Features : For bag tubes produced by ordinary flat-end multi-layer kraft paper tube making machines, the bottom of the bag usually needs to be sewn with an industrial sewing machine, and the square bottom must be glued manually. Currently, automatic bottom gluing equipment is also available.

3. Kraft paper composite equipment

Before producing kraft paper bubble film envelope bags, the kraft paper and bubble film need to be laminated first. This process requires special laminating equipment.

Technical features : used for laminating kraft paper and bubble film, with advantages such as fast speed, few wrinkles, neat winding, automatic loading, and electric eye tracking.

Typical technical parameters :

• Composite width : 10-1000mm
• Compound speed : 45-60 m/min
• Motor power : about 11.2KW

4. How to choose suitable kraft paper packaging bag production equipment

When choosing kraft paper bag production equipment, the following factors need to be considered:

1. Product type : Select the appropriate equipment based on the type of product you plan to produce (flat bags, bubble bags, multi-layer heavy bags, etc.);
2. Production scale : Select the degree of automation and production speed of the equipment based on the expected output;
3. Raw material specifications : Consider the planned kraft paper weight, roll width, and other parameters to ensure equipment compatibility;
4. Power conditions : Most equipment requires 380V industrial electricity, so the corresponding power facilities must be prepared in advance;
5. Plant space : Large equipment requires sufficient installation and operating space, which needs to be planned in advance;
6. Budget range : The prices of equipment with different degrees of automation vary greatly, so you need to make a reasonable choice based on your investment budget;

5. Equipment maintenance and care recommendations

In order to extend the service life of the equipment and ensure production efficiency, regular maintenance is required:

1. Regular cleaning : clean glue stains and paper dust on the equipment in time to keep the equipment clean;
2. Lubrication and maintenance : Add appropriate lubricating oil to the transmission parts regularly according to the requirements of the equipment manual;
3. Electrical inspection : Check the electrical connections regularly to ensure they are secure and not loose.
4. Tool maintenance : Check and sharpen the cutter regularly to keep it sharp;
5. Professional maintenance : Carry out a comprehensive professional maintenance at least once a year to detect and solve potential problems in a timely manner;

Kraft paper bag production equipment requires a high level of technical expertise, and selecting the right equipment is crucial for improving product quality and production efficiency. With the continuous advancement of technology, modern kraft paper bag production equipment is developing towards intelligent, automated, and highly efficient production, providing the packaging industry with more advanced production solutions.

When purchasing equipment, it is recommended to fully understand the technical characteristics and parameters of different equipment based on your actual needs, choose a reputable equipment supplier, and do a good job of installing, debugging and maintaining the equipment. This will ensure the smooth progress of the production process and create the greatest economic benefits.