Method for preparing calendered film of polyvinyl chloride for blood transfusion appliance

Abstract

The method for preparing PVC calendered film which can be used for making blood bag for blood transfusion includes the following steps: adding granular or powdered PVC material into a high-speed mixing machine, high-speed kneading, then feeding the above-mentioned into an extruding machine to make plastication, uniformly extruding out, refining extruded material, filtering, calendaring and forming by means of calendaring machine to obtain film, double-face embossing, cooling, eliminating static electricity, removing dust and cleaning treatment so as to obtain the invented film product.

Description

Technical field: [0001] The invention relates to a method for making a polyvinyl chloride calendered film for blood transfusion equipment, and belongs to the technical field of plastic film production. Background technique: [0002] The existing multi-packs for blood collection in my country are composed of ACD-B anticoagulant plus red blood cell preservation solution plus plasma collection bags, and are stored in cold storage after blood collection. Before use, the blood bag needs to be centrifuged at 3500RPM for 10 minutes, and the cell separation chromatography is carried out at a temperature of 4-5 degrees. With the increasing amount of clinical blood used in my country, the amount of blood bags is very large. However, affected by the manufacturing process of the existing film for blood transfusion equipment, the blood bag produced has problems such as easy damage and red blood cell damage during centrifugation, so the waste caused is also very huge. In the prior art, ...

AI Technical Summary

Problems solved by technology

However, affected by the production process of the existing film for blood transfusion equipment, the produced blood bag has problems such as easy damage and red blood cell damage during centrifugation, so the waste caused is also very huge

In the prior art, the film production process of blood bags still adopts the blow molding process of the 1970s and 1980s. The thickness of the produced films is uneven, and the longitudinal and transverse tensile strengths are greatly different, which makes the blood bags easy to centrifuge in the centrifugation process. The film is damaged, and only one-sided vertical stripes can be made on this film. When the blood bag is heated and sterilized, the film on the smooth side is easy to stick together

Moreover, the processed patterns are thick, which is easy to cause damage to red blood cells during centrifugation, which seriously affects the quality and storage time of blood stored in blood bags.