Block Bottom Valve Bag Production Process: Optimization and Innovation

Block Bottom Valve Bags, or square bottom bags with valves, are an important achievement in the field of industrial packaging. Designed to meet the need for efficient and safe packaging of powder and granule products, these bags feature a smart opening and closing mechanism at the bottom of the bag, which significantly improves packaging speed and minimizes the risk of product leakage. High durability and good waterproofing make them the ideal solution for heavy industries such as cement, chemicals and animal feed.

The production process of Block Bottom Valve Bags includes many highly technical stages, from choosing the right raw materials, through the steps of manufacturing the bag’s special structure, to installing complex parts such as valves and square bottom. Each step in this process requires precision and advanced technology to ensure the final product is of the highest quality, best serves the needs of the market and contributes to improving product efficiency. output of businesses.

Necessary ingredients

Block Bottom Valve Bags are manufactured from two main materials: polyethylene (PE) and polypropylene (PP). Each of these materials has unique characteristics that make them the ideal choice for the production of square bottom bags with valves:

Polyethylene (PE)

• Characteristics: PE is a type of plastic with high elasticity and good bearing capacity.
• Application: This material is often used to produce bag parts that need tensile strength and can withstand heavy pressure without tearing.
• Benefits: PE helps increase the impact resistance of the bag, thereby protecting the product inside from external factors during transportation and storage.

Polypropylene (PP)

• Characteristics: PP stands out with its high durability, good heat resistance and does not react with most chemicals.
• Application: Usually used for parts of the bag that come into direct contact with chemical products or require high hygiene.
• Benefits: PP increases the waterproofing and moisture resistance of the bag, ensuring that the product inside is not affected by the outside environment, while also making it easier to print and decorate the bag’s surface.

Detailed production process of Block Bottom Valve Bags

The Block Bottom Valve Bag production process is a series of sophisticated technical steps, each of which plays an important role in ensuring the quality of the final product. Below is a detailed description of each stage of the production process:

Raw material preparation stage

• Quality Test: Raw materials such as polyethylene (PE) and polypropylene (PP) are imported from reputable suppliers and undergo stringent quality tests to ensure that they do not contain any impurities which can affect the bag’s functionality.
• Mixing raw materials: After being tested, raw materials will be mixed according to a special formula to create a plastic mixture with physical and chemical properties suitable to the product’s requirements. The mixing ratio needs to be precise to ensure the bag has optimal strength, elasticity and load-bearing capacity.

Bag formation stage

• Extrusion: The plastic mixture is passed through an extruder, forming thin plastic film sheets. This process requires strict control of temperature and speed to ensure a uniform plastic film without any defects.
• Cutting: The plastic film is then cut into large sheets, suitable for the size of each type of bag. Cutting must be precise so as not to affect the material structure.
• Welding: Plastic panels are welded together using advanced heat welding technology. This is an important step to form the square bottom shape of the bag, ensuring the welds are sturdy and have no possibility of leakage.

Welding and valve installation stage

• Valve installation: The one-way valve is strategically located at the bottom of the bag, making it easy to fill the bag without opening the bag completely. This installation needs to be done carefully to ensure the valve operates effectively and does not cause leaks.
• Welded bottom of the bag: The bottom of the bag is sealed to form a solid square, ensuring the bag can stand firmly when filled and withstand the pressure of the product when stacked.

Quality check phase

• Sealing and durability testing: Each bag undergoes pressure testing to ensure there are no leaks at any of the welds. This is an essential step to ensure product quality and safety.
• Check aesthetics and accuracy: In addition, the bag surface is also thoroughly checked to ensure there are no printing or color errors. Information such as logos and product information are printed properly and clearly.

The Block Bottom Valve Bag production process requires meticulousness and high precision. Each step in this process requires not only technical understanding but also modern machinery technology to ensure that every detail of the product meets the highest standards, meeting increasingly demanding needs, market slots.

Machinery technology used in production

Using advanced machinery technology is an indispensable part of the Block Bottom Valve Bag production process, helping to increase production efficiency and ensure product quality. Below are some of the main types of machinery used in this process:

Extruders

• Function: The extruder is used to turn raw plastic mixture into a continuous thin plastic film.
• Advantages: This device allows precise adjustment of temperature and extrusion speed, ensuring the plastic film has uniform thickness and size, essential for final bag quality.

Cutting machines

• Function: After the plastic films are created, the cutting machine will cut them according to pre-programmed sizes, creating the initial templates of the bags.
• Advantages: Modern cutting technology helps ensure the edges of the bag are cut accurately and cleanly, increasing the durability and aesthetics of the product.

Welder

• Function: The welding machine is used to weld plastic sheets together, form the bag body and weld the bottom of the bag.
• Advantages: Modern heat welding machines allow strict control of welding temperature and pressure, ensuring strong and leak-free welds.

Printer

• Function: For bags that require printing logos or product information, the printer will be used to print directly on the surface of the bag.
• Advantages: Modern printers allow precise, clear and durable printing, significantly improving the aesthetics of the product.

The importance of quality control

The quality control process in the production of Block Bottom Valve Bags plays an essential role, not only to ensure that the final products meet technical standards but also to maintain customer confidence. row. The following are the key aspects of the quality control process:

Check for Tightness and Durability

• Purpose: Ensure that each bag has the load-carrying capacity and does not leak under actual conditions of use.
• Method: Apply pressure and tension tests to evaluate the strength of the weld and the material of the bag.

Check for Accuracy and Aesthetics

• Purpose: Ensure that the information printed on the bag is accurate and meets aesthetic requirements.
• Method: Use automatic testing equipment to evaluate printing clarity and color uniformity.