A kind of three-layer medical infusion bag and its manufacturing method

Abstract

The invention aims to provide a three-layer medical infusion bag. The three-layer medical infusion bag comprises a flat infusion bag body of a three-layer structure. The three-layer structure comprises an inner bag layer made of polyethylene material, a middle bag layer made of polypropylene and styrene-ethylene / butylene-styrene segmented copolymer material and an outer bag layer which is a blended layer of polypropylene, carboxylated styrene-ethylene / butylene-styrene segmented copolymer and anionic polymerization nylon nanocomposite. The barrier performance of the anionic polymerization nylon nanocomposite of the outer bag layer is excellent. Air inlet is not needed in the infusion process and medicine liquid can automatically flow and is completely drained through the design of the thickness and the width of the infusion bag body, and therefore the whole infusion bag is good in safety, barrier property and infusion performance. The invention further provides a manufacturing method of the three-layer medical infusion bag. One-time injection molding and air blowing are conducted through a three-die-head injection molding die, the whole process is simple and advanced, one-time forming is achieved, the method is suitable for production of the infusion bag, and the manufactured infusion bag meets the infusion requirement.

Description

technical field [0001] The invention relates to the field of medical transfusion containers, in particular to a safer medical transfusion bag and a method for manufacturing the transfusion bag. Background technique [0002] At present, there are several types of medical infusion containers, such as plastic bottles, co-extruded infusion films and blended infusion bags. The following is a brief introduction to the contents of these types of infusion containers and their shortcomings: [0003] Such as the plastic bottle announced by Patent No. CN 201759852 U is light in weight and has good compatibility with medicinal liquid, but still has the defect of glass bottle in the way of infusion, which requires air intake, thus causing harmful bacteria and particles in the bottle to increase. Possibly, so the development of plastic bottles is limited. [0004] Another example is the co-extrusion infusion film announced by Patent No. CN 101462389 A, which is a three-layer film with g...

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Problems solved by technology

[0003] Such as the plastic bottle announced by Patent No. CN 201759852 U is light in weight and has good compatibility with medicinal liquid, but still has the defect of glass bottle in the way of infusion, which requires air intake, thus causing harmful bacteria and particles in the bottle to increase. Possibly, so the development of plastic bottles is limited

[0004] Another example is the co-extrusion infusion film announced by Patent No. CN 101462389 A, which is a three-layer film with good temperature resistance, excellent clarity, wide heat-sealing temperature range, flexibility in high and low temperature environments, good phase Capacitive, but the inner layer is polypropylene, and the outer layer has no barrier layer. It adopts a co-extrusion process, which is expensive and has high production costs. Leakage is its structural defect

[0005] Another example is the blended material infusion bag announced by Patent No. CN 102397160 A. This infusion bag has the characteristics of light weight, low cost, high quality, and integrated molding. It does not need air intake during use and uses atmospheric pressure for infusion. The soft bag is a bag with only one or two layers of blended materials. The layer in contact with the liquid medicine has related substances migrating to the liquid medicine. Its safety and barrier properties need to be considered

[0006] One of the applicant's patents is CN 101411672 B, an invention patent, which discloses a medical infusion soft bag and its manufacturing method and shaping method. It is not completely consistent, and the sealing effect needs to be checked at all times; toughened plastic is added to the raw material of the infusion bag, which is expensive and low in safety; Empty performance; the side of the infusion bag is a smooth curved surface arc, which is not conducive to the self-emptying of the liquid medicine; the infusion bag body is made of soft plastic, and the infusion bag body must be placed in the mold cavity of the corresponding shape to obtain the final shape; the pull ring type Polypropylene combination caps may cause the pull ring to break easily and be difficult to pull apart, and water vapor at the pull ring is easy to infiltrate during sterilization, causing pollution; at the same time, the one-step method of its production process (injection, stretching and blowing, only for the bag body, not including the combination Cover) or two-step method (injection, bag making) are more complex and susceptible to foreign matter

Another invention patent of the applicant, CN 103519991 A, discloses a new type of plastic infusion bag and its manufacturing method. Needle, when using a non-inflated infusion needle for infusion, it can be completely self-emptied and will not return blood, and the shape of the bag will not be seriously deformed and the infusion bag can stand stably; however, the infusion bag is one layer, and its composition Substances related to polypropylene will migrate to the liquid medicine, and its safety and barrier properties need to be considered

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