Resin bag production equipment

Abstract

To provide a resin bag production equipment which can reliably produce high-quality resin bags. Three sides on the periphery of a bag body (100) are welded with a welding / cutting device (30) while remaining an opening part (101) unwelded. A port (200) is inserted into the opening part (101), and the opening part (101) is welded to the port (200) with a port welding device (80). In the welding / cutting device (30), the welding is flat welding. On the other hand, in the port welding device (80), when the port (200) is welded to the opening part (101) in the bag body (100), only three-dimensionalwelding is carried out in such a state that the port (200) is inserted into the opening part (101). According to the above constitution, a deterioration in appearance due to cockling of a film (F) and the formation of a gap due to unreliable welding can be prevented in the periphery of the weld of the bag body (100) and the port (200), and high-quality resin bags can be reliably produced.

Description

technical field [0001] The present invention relates to a resin bag manufacturing facility for manufacturing resin bags used as containers for fluids such as infusions. Background technique [0002] Resin bags are used as containers for liquids such as infusion solutions. Such a resin bag is formed of a soft resin film, etc., and a cylindrical bag formed of a hard resin as an opening for allowing liquid to enter and exit is passed through a bag-shaped bag body with one opening and an opening of the bag body. The port is formed. [0003] Conventionally, in such a resin bag, the port is fixed between two strip-shaped films, these two films are welded, and the port is sandwiched between the two films at the opening portion. The thin film and the port are welded (for example, refer to Patent Document 1). [0004] Patent Document 1: International Publication 2006 / 042710 ( Figure 7 ) [0005] However, the above-mentioned conventional manufacturing method has the following pro...

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Problems solved by technology

[0005] However, the above-mentioned conventional manufacturing method has the following problems. Around the welded part of the film and the port, the appearance is affected by wrinkles on the film, or the film is stretched so that welding cannot be reliably performed, and the sealing strength is insufficient. or create a gap between the membrane and the port

[0006] This is because, firstly, since the welding between the films along the outer shape of the container and the welding of the film and the port are carried out simultaneously, the film length of the part wound around the circular port is insufficient, and it is difficult to set As a result, it is difficult to stabilize the welding quality of both parties.

[0007] In addition, the technology described in Patent Document 1 performs cutting of the film along the outer shape of the container in addition to welding between the films along the outer shape of the container and welding between the film and the port. The molds for welding and cutting are complicated, and it may be difficult to set optimal conditions not only for welding but also for cutting

[0008] In addition, because the fusion welding between the films along the outer shape of the container is a plane fusion welding, in contrast, the fusion welding of the film and the port is a three-dimensional fusion welding, and the welding part of the plane and the three-dimensional When the mold for welding is pressed near the boundary of the welded part, the film itself stretches and becomes thinner, or the film tends to wrinkle

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