JPH04452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in an infusion bottle used for medical purposes and a manufacturing method thereof.

<Prior art> Conventional infusion bottles are made of glass or polyvinyl chloride,
It is made from synthetic resin such as polypropylene,
Each had advantages and disadvantages.

Glass infusion bottles have extremely high transparency and allow the contents to be clearly seen, making it easy to remove defective products due to contamination such as foreign objects and to monitor the volume of the liquid. It was dangerous and very inconvenient to handle.

Infusion bottles made of polyvinyl chloride do not have good transparency and are translucent, and those made of soft polyvinyl chloride cannot stand up like glass bottles, resulting in poor workability.

Furthermore, infusion bottles made of polypropylene, especially those molded by the conventional biaxial stretching method disclosed in the invention of Japanese Patent Publication No. 58-44066, have thick walls, are hard in material, and However, when trying to mold the material thinly, practical strength against drop impact could not be obtained, and it was difficult to make it thin and flexible.

In addition, infusion bottles made of glass or hard plastic lack elasticity and resilience due to the characteristics of the material, so when using the infusion bottle, air must be introduced from the outside by inserting an air needle etc. Since the infusion solution does not drip, there is a risk of bacterial contamination in the air in that case.

<Problems to be Solved by the Invention> In view of the above-mentioned problems, an object of the present invention is to provide a soft infusion bottle made of polypropylene that does not require an air needle, and a method for manufacturing the same.

<Means for Solving the Problems> The soft infusion bottle of the present invention uses a semi-finished product with a bottom made of polypropylene, and has a heat-resistant elastic bottle at the opening of the semi-finished product for attaching to a jig. A cap made of wood is airtightly covered to make a temporary stopper, the mounting part of this cap is attached to a jig member, the semi-finished product is suspended from the jig member, and the semi-finished product is heated at a temperature below its melting point. , the semi-finished product is stretched relatively slowly by its own weight, the semi-finished product is moved into the mold, the bottom of the semi-finished product is held by an appropriate member, the container mold is closed, and the cap is A blowing nozzle for blowing fluid into the body is penetrated, and an appropriate fluid is injected from the blowing nozzle into the internal space of the semi-finished product to form it into a predetermined shape.
This method involves creating a tough and transparent molded product, and then attaching a rubber plug to the mouth of the molded product.

<Example> Hereinafter, the soft infusion bottle made of polypropylene of the present invention will be explained in detail with reference to the illustrated example.

1A and 1B are views showing a soft infusion bottle of the present invention, which is composed of a body portion 1, a mouth portion 2, and a hook 3, and the mouth portion 2 is provided with a rubber stopper 4.

2 to 5 are schematic diagrams showing the manufacturing process of the soft infusion bottle of the present invention, in which a polypropylene semi-finished product 11 with a sealed bottom as shown in FIG. The mouth part 12 and the hook 13
is formed. Next, as shown in FIG. 3, a temporary stopper 14 made of a heat-resistant elastic material and having a mounting portion 15 formed on the outer periphery is attached to the opening 12 of the semi-finished product 11. Then, as shown in FIG.
The attachment part 15 of 4 is attached to the jig member 16, heated, softened, and stretched downward by the weight of the semi-finished product, and moved into a container mold as shown in FIG. A hook 13 provided at the bottom of the bottle is held between jig parts 17, 17. Then, the molds 18, 18 are moved from both sides to form a mold space of a predetermined shape (indicated by imaginary lines in the figure), and the semi-finished product 1 is moved from the temporary stopper 14.
A blow nozzle 19 is inserted into the inside of the container 1, and an appropriate fluid (for example, air, nitrogen, or inert gas) is injected into the container 1 to form a predetermined thin-walled hollow bottle shape.

The temperature during the above stretching should be 137°C because if the surface temperature of the parison exceeds 142°C, drawdown will occur and the thickness of the body will become thinner, making blow molding in the next process difficult. Favorable results were obtained by heating the film in a range of 141° C. to 141° C. (preferably 138° C. to 141° C.) and slowly stretching the film in that state for about 18 minutes.

Due to the material of the molded product formed by the above process, the average wall thickness of the body part 1 is t = 0.2 to 0.3 [mm]
It is extremely thin and soft, and has sufficient strength to withstand drops and impacts.Moreover, it has extremely high transparency, almost on par with glass products.

Next, in order to make an infusion bottle, the temporary stopper 14 of the molded product is removed and a rubber stopper is attached to the mouth part 12, resulting in a soft infusion bottle as shown in FIGS. 1a and 1b. Further, the infusion solution is injected into the soft infusion bottle after the soft infusion bottle is completely washed.

<Function> Although the soft infusion bottle of the present invention produced by the manufacturing process according to the manufacturing method of the present invention described above is made of polypropylene, it does not flex in the longitudinal direction, that is, the vertical direction, during the manufacturing process of the biaxial stretching method. When stretching, the weight of the semi-finished product itself is used to stretch the product, so it can be stretched naturally without applying excessive stress, and there is no accumulation of strain in the molded product, so even if it is extremely thin, it will not fall. , it has sufficient practical strength against impact, and since it is thin, it is soft, and when injecting infusion fluid, it can be used without inserting an air needle. As shown, the body 1 of the infusion bottle is recessed due to the equilibrium pressure with the external pressure caused by the outflow of the infusion solution, that is, the content liquid, and dripping is possible. Therefore, infusion set 20
By inserting the bottle needle 21 into the rubber stopper 4 provided at the mouth 2 of the soft infusion bottle and suspending the hook 3 from the hanger 22, dripping can be carried out naturally.

<Effects of the Invention> As described above, the soft infusion bottle of the present invention is effectively created by the biaxial stretching method unique to the present invention, and has properties unique to polypropylene materials such as extremely high transparency, which allows the contents to be clearly seen. , it has the effect of making it easier to remove defective products due to contamination with foreign substances, etc., and it also has the effect of being able to be molded thinly while having sufficient practical strength against drops and impacts, making it softer. This eliminates the need to use an air needle, making it possible to prevent airborne infections and blood reflux.

In addition, the conventional soft packs made of soft vinyl chloride were very inconvenient because they could not stand on a desk or workbench, but the soft packs of the present invention The bottle can be placed on a flat plate, making it easy to mix other drugs into the infusion.

Furthermore, by forming the material into a thinner material, the material cost can be reduced, and the cost can be reduced, and since it can be crushed into small pieces, it can be easily disposed of.

Furthermore, the manufacturing method does not require any stretching member or stretching process, which simplifies the process, and eliminates the conventional drawback of distortion of the product due to stretching by external force.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, FIG.
A front view of the soft infusion bottle of the present invention, FIG. 1b is the same as above, a side view, FIGS. It is a figure which shows the usage state of an infusion bottle. 1... body part, 2... mouth part, 3... hook, 4
...Rubber stopper, 14...Temporary stopper.

Claims (1)

[Scope of Claims] 1. A hollow body 1 of a container having a hook 13 protruding from the bottom and a mouth 12 at the top is formed into a thin wall of 0.2 to 0.3 mm by stretching under its own weight at a temperature below the melting point. A thin-walled flexible infusion bottle made of polypropylene, which is highly transparent and whose body portion is concave and contract due to the difference in internal and external pressure. 2. A temporary stopper 14 having a circumferential groove and other attachment parts 15 on the outer circumferential surface is airtightly covered over the opening 12 of a polypropylene semi-finished product 11 with a hook 13 protruding from the bottom, and the temporary stopper is inserted through the attachment part. After engaging the hook with the jig member 16 and suspending the semi-finished product, heat it at a temperature below the melting point to soften it and stretch it under its own weight, and then the hook is held between the jig members 17, 17. and hold the stretched semi-finished product in the molding molds 18, 18,
A method for manufacturing a soft infusion bottle, characterized by forming the semi-finished product by injecting fluid into the semi-finished product from a blow nozzle 19 passing through the temporary stopper.