PP Woven Bag Production Line

Raw material preparation
The production of pp woven bags starts with the preparation of the raw materials, which typically include high-quality polypropylene granules, color masterbatch, and other additives. The granules are melted and mixed together to form a homogenous mixture, which is then passed through an extruder to produce a continuous plastic film. The temperature, speed, and pressure of the extruder must be precisely controlled to ensure that the film is of the correct thickness and strength. The use of high-quality raw materials is essential for producing durable, strong bags that can withstand the weight of the contents and handling during transportation.

Extruding & drawing
After the film has been produced, it is then extruded and drawn to increase its strength and stability. The film is extruded through a die, and the speed and pressure of the extruder are closely monitored to ensure that the film is of the correct thickness. The drawing process further increases the film's strength and stability, which is critical for ensuring the bags are strong enough to withstand the weight of the contents and handling during transportation.

Weaving
The next step is weaving the plastic film with a woven fabric, such as polypropylene, to create a laminated material. This process involves using high-speed weaving machines to interweave the film and fabric together, producing a strong and durable material suitable for making bags. The weaving process must be accurately controlled to ensure that the fabric and film are properly interwoven and that the final product is of the correct thickness and strength.

Winding
After the laminated material has been created, it is then wound onto a large spool for storage and protection. This step helps ensure that the material remains in good condition until it is needed for the next stage, and makes it easier to manage the material, reducing the risk of damage during transportation and storage.

Cutting & sewing
The laminated material is then cut into the desired size and shape, and the edges are sewn together to create the final bags. This step is usually performed using specialized cutting and sewing machines, which are equipped to handle heavy-duty materials and produce consistent results. The cutting and sewing process must be executed with care to ensure that the bags are of the correct size and shape, and that the seams are strong enough to withstand the weight of the contents and handling during transportation.

Printing
If desired, printing can be done on the bags using rotogravure or flexo printing methods. This printing can be done on one or both sides of the bags, and the customer chooses the design. Printing on the bags can include logos, branding, and other information that is useful for the customer or end-user. The printing process must be executed with care to ensure that the printing is of high quality, and that the colors are vibrant and accurate.

Inspection
The final bags are thoroughly inspected for any defects, ensuring that only high-quality products are sent to the customer. This step is critical in ensuring that the customer receives a product that meets their expectations and requirements, including the correct size, shape, color, and print, and is free of any defects or damages.

Packing
The final step is to carefully package the bags for shipment to the customer. The bags are packaged to ensure they reach the customer in perfect condition and minimize the risk of damage during transportation. The packaging process is critical in ensuring that the customer receives a high-quality product that meets their expectations and requirements.

Generally speaking, high-quality polypropylene woven bags are non-toxic and tasteless, and have almost no harm to the human body. Although they are made of various chemical plastics, they are environmentally friendly and have greater recycling rates.

From the appearance to distinguish good from bad, you can see whether there are skipping ropes and colors, whether they meet the requirements of woven fabrics. From a professional point of view, whether it is recycled materials, semi-permeable materials or woven fabrics of new materials. Woven bags made of this new material are of good quality and can be reused. Polypropylene woven bags made of original materials can be used outdoors. More than a few months.

Generally speaking, the quality of polypropylene woven bags made of recycled materials is poor, and polypropylene woven bags made of recycled materials are neither white nor transparent. We can also shake it again to see if there is any debris. The point is whether the smell is strong. The recycled polypropylene woven bags are made from waste plastics and industrial waste. Most of them are cloudy, sticky to the touch, and have a strong plastic smell.

The naked eye can only identify it roughly, and whether it needs to be tested for accuracy. Carry out appearance quality, tensile load, drop test, heat resistance, sanitary performance and other tests. If the surface wrinkles are not obvious after flattening, we can rub it with our hands, the quality is better, and the hand feel is not good. The thickness and density can also be checked, and then pulled out to check the strength. The relative breaking force is significantly reduced for polypropylene woven bags of recycled materials.

If an auxiliary return material is added, the relative breaking force will be lower. The elongation at break is unstable, and the addition of recycled materials will affect the breaking rate. The brittleness of recycled materials polypropylene woven bags is significantly improved, especially the low temperature brittleness is worse, the electrical insulation is reduced, the impact resistance is reduced, the aging degree is improved, and the speed is accelerated.

Our company specializes in manufacturing pp woven fabric production lines, non woven bag making machines, woven bag cutting and sewing machines, laminating machines, printing machines,circular loom and other plastic machinery and equipment. Our products have been sold throughout the country and have been exported to turkey, mexico, brazil, zimbabwe, russia, vietnam, indonesia and other countries and regions.