Paper plastic bags, also known as three in one composite paper bags, are easy to transport small volumes of powder and granular materials. It has the characteristics of high strength, good waterproofing, beautiful appearance, and convenient loading and unloading, making it a popular and practical ordinary packaging material. With the progress and development of technology, paper plastic bags have been increasingly widely used: paper plastic composite bags can be applied in various fields such as industrial packaging, food packaging, electronics, aerospace, technology, military, and so on. Paper plastic composite bags - Composite plastic woven bags are made from plastic woven bags (referred to as cloth) as the substrate, and are formed by casting (cloth/film composite is a two in one, and cloth/film/paper composite is a three in one). Mainly used for packaging powder or granular solid materials and flexible items, such as fertilizers, synthetic materials, explosives, grains, salts, minerals, etc. Below is an introduction to its classification and advantages and disadvantages:

1、 Classification of paper and plastic bags

1. Paper plastic bags can be divided into: middle seam bags and side middle seam bags are bonded by the back of the same woven fabric, then compounded with Kraft paper, and the bottom seam is bottomed. The side seam bag is made of woven tube material and Kraft paper, and the bottom seam is used.

2. Paper plastic composite bags are divided into polypropylene two in one bags, polypropylene three in one bags, polyethylene two in one bags, and polyethylene three in one bags based on their main material composition.

3. Paper plastic composite bags are divided into sewn bottom bags, sewn edge bottom bags, inserted bags, glued bags, and sewn bags according to the sewing method.

2、 Advantages and disadvantages of paper plastic bags

1. Advantages: The packaging is visible, with good microbial barrier function and good impermeability. Suitable specifications of paper and plastic packaging can be selected based on the length and size of the packaging equipment. It can be used for high-pressure steam and ethylene oxide sterilization, and the packaging is printed with two chemical discoloration indicator areas (pink before EO sterilization, yellow after sterilization; blue before high-pressure steam sterilization, black after sterilization).

2. Disadvantages: Paper plastic sterile bags stored in clinical departments are prone to wrinkling, sealing and cracking, and hard materials have poor dryness. Some water droplets remain on the inner surface of the plastic, and sharp tools can easily puncture the packaging of the paper plastic bag. At present, it has been widely used in hospitals, but due to its unilateral ventilation, some metal instruments are prone to produce condensation during the sterilization process, and paper plastic packaging bags cannot be used for lower exhaust sterilizers.

Paper plastic bags usually require a clean surface, free from damage, looseness, foreign object attachment, layering, and other abnormal phenomena. The plastic bag should have good transparency, flat surface, no elastic wrinkles, no adhesion between bags, good opening, easy to peel, and no air leakage at the sealing area of the plastic bag. Open the opening of the bag to inflate, tie the opening tightly, and forcefully tap the plastic bag. There should be no cracks at the sealing area of the plastic bag, and the cutting should be neat and free of burrs. The printed drawings and text should be clear and correct, and the depth should be consistent. The printing color is not leaked, the coloring is firm, and the position is accurate. It should be ensured that it is consistent with the content, color, size, and other requirements specified in the order drawing or calibration draft. Only by meeting the above conditions can it be put into use in the market.