JP2007229184A - Plastic container for drug solution and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic container for a drug solution by which a rubber plug is securely held in a cylindrical mouth portion preventing coming off and falling off despite having simple construction of having the cylindrical mouth portion at one end and directly pressedly inserting the rubber plug into the cylindrical mouth portion to seal the same and a manufacturing method. <P>SOLUTION: The plastic container for drug solution 1 has the cylindrical mouth portion 2 at one end and is constituted by pressedly inserting the rubber plug into the cylindrical mouth portion 2 to be sealed. An annular boss 5 is formed in the inner face of the cylindrical mouth portion 2. The rubber plug 6 is formed such that its outer diameter is slightly larger than the inner diameter of the cylindrical mouth portion 2. The rubber plug 6 pressedly inserted into the cylindrical mouth portion 2 is meshed with the boss 5 due to the compressive deformation of a part abutting to the boss 5, so that the rubber plug 6 is held in the cylindrical mouth portion 2 while preventing coming off and falling off of the rubber plug 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes carbohydrate infusions, electrolyte infusions, plasma bulking agents, osmotic diuretics, amino acid infusions, fat emulsions, high calorie infusions, etc., colon nutrition, high protein nutrition, The present invention relates to a plastic container for medicinal liquids such as an ingredient nutrient and a colonic high calorie nutrient such as a liquid food and a method for producing the same.

A plastic container for a chemical solution that has a cylindrical mouth portion at one end and is sealed by directly pressing a rubber stopper into the cylindrical mouth portion is well known as described in Japanese Patent Publication No. 57-53184. ing. In addition, in the plastic container for chemical liquids, a configuration in which a rubber plug is included in a plug welded to the mouth is disclosed in Japanese Patent No. 2934777, Japanese Patent No. 3182618, and Japanese Patent Laid-Open No. 5-76580. A blow pin for molding a container is formed by injecting a driving pin that regulates the inner diameter of the cylindrical mouth portion into a portion of the blow molding die for molding the cylindrical mouth portion, and blowing a pressure fluid into the parison through the driving pin. The forming method is described in Japanese Patent Publication No. 8-13503.
Japanese Patent Publication No.57-53184 Japanese Patent No. 2934777 Japanese Patent No. 3182618 JP-A-5-76580 Japanese Patent Publication No. 8-13503

  This type of plastic container for medicinal solution is injected with an injection needle with an infusion tube attached to the rubber stopper at the time of infusion, so the rubber stopper that seals the cylindrical mouth is flexible and easy to inject and remove the injection needle. However, it is important that the rubber stopper does not drop when the injection needle is injected, and that the rubber stopper does not fall out when the injection needle is removed. It is recently required that the plug structure for mounting is as simple as possible.

  Therefore, the present invention has a simple structure in which a cylindrical mouth portion is provided at one end and a rubber stopper is directly press-fitted into the cylindrical mouth portion to be sealed. The rubber stopper that is formed into an annular protrusion and press-fitted into the cylindrical mouth is engaged with the protrusion by compressive deformation of the portion that hits the protrusion, so that the rubber stopper is securely retained and prevented from falling into the cylindrical mouth. It is an object of the present invention to provide a plastic container for a chemical solution having the structure described above and a method for producing the same.

  In order to achieve the above object, a plastic container for chemical liquid according to claim 1 of the present invention is a plastic container for chemical liquid which has a cylindrical mouth portion at one end and is sealed by press-fitting a rubber stopper into the cylindrical mouth portion. An annular projection is formed on the inner surface of the cylindrical mouth, and the rubber plug has an outer diameter slightly larger than the inner diameter of the cylindrical mouth. The rubber plug press-fitted into the cylindrical mouth is It is characterized in that the rubber plug is held by the cylindrical mouth portion so as to be prevented from coming off and falling down by being engaged with the projection by compressive deformation of the portion that hits the projection.

  The plastic container for chemicals according to claim 2 of the present invention is the plastic container rubber stopper for chemicals according to claim 1, wherein the plastic stopper for the chemical liquid has a concave portion formed to be pressed into its cylindrical mouth, and the top surface is The concave portion is formed in a thin shape.

  According to a third aspect of the present invention, there is provided a method for producing a plastic container for chemical liquids comprising: a cylindrical mouth part at one end; and a plastic container for chemical liquids that is sealed by press-fitting a rubber stopper into the cylindrical mouth part. In the method of forming the cylindrical mouth portion of the split mold, a ring-shaped protrusion is formed with the split mold closed, and a parison is arranged between the split molds. A pressure fluid is blown into the inside, and an annular protrusion is formed on the inner surface of the cylindrical mouth portion by the annular protrusion.

  According to the present invention, although it has a simple configuration in which a cylindrical mouth portion is provided at one end and a rubber stopper is directly press-fitted into the cylindrical mouth portion and sealed, The rubber plug that is formed into an annular protrusion and press-fitted into the cylindrical mouth is engaged with the protrusion by compressive deformation of the portion that hits the protrusion, so that the rubber stopper is reliably prevented from coming off and falling into the cylindrical mouth. A plastic container for medicinal solution having a configuration to be held can be obtained.

  FIG. 1 is a sectional view showing a part of a plastic container for chemical liquid according to one embodiment of the present invention, FIG. 2 is a front view of the whole same as above, and FIG. 3 is a diagram of the plastic container for chemical liquid according to one embodiment of the present invention. It is a partial sectional view showing a blow molding mode.

  1 and 2, reference numeral 1 denotes a chemical liquid plastic container, which has a cylindrical mouth portion 2 at one end thereof, 3 is a trunk portion, and 4 is a bottom portion. The bottom part 4 is provided with a hanging tool for suspending the container in an inverted posture (not shown). The plastic container 1 for chemicals is composed of polyolefin resins such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene, ethylene / vinyl acetate copolymer (EVA), poly It is formed of a soft resin such as vinyl chloride (PVC), ionomer resin, various thermoplastic elastomers, and a mixture of two or more thereof.

  In the chemical liquid plastic container 1, an annular protrusion 5 is formed on the inner surface of the cylindrical mouth portion 2. The protrusion 5 is formed in an annular shape over the entire inner surface of the cylindrical mouth portion 2, and the protrusion 5 has a gently curved bulge shape inward. 6 is a rubber stopper. The rubber plug 6 has an outer diameter slightly larger than the inner diameter of the cylindrical mouth portion 2, and the rubber plug 6 press-fitted into the cylindrical mouth portion 2 meshes with the protrusion 5 by compressive deformation of the portion that contacts the protrusion 5. Thus, the rubber stopper 6 is held by the cylindrical mouth portion 2 so as not to come off and to fall down. The rubber plug 6 is formed in a concave shape so that a portion press-fitted into the cylindrical mouth portion 2 forms a concave portion 7, and the thin portion 8 is formed with the top surface also being concave. The rubber stopper 6 is injected with an injection needle fitted with an infusion tube into the thin-walled portion 8 on the top surface. However, since the injection part of the rubber stopper 6 is thin, injection and extraction of the injection needle are easy. It is. The rubber plug 6 is preferably flexible so that it can be easily press-fitted into the cylindrical mouth portion 2. In the illustrated embodiment, a flange portion 9 is formed at the opening end of the cylindrical mouth portion 2, and the rubber plug 6 is also formed in a shape corresponding to the flange portion 9. This is not an essential configuration in the invention.

  The plastic container 1 for chemicals according to the present invention is blow molded as shown in FIG. In FIG. 3, reference numerals 10 and 10 denote split molds, and the mouth mold cavity 11 for molding the cylindrical mouth portion 2 of the split molds 10 and 10 has an annular shape with the split molds 10 and 10 closed. A projection 12 is formed. The protrusion 12 protrudes in a thin plate shape and is provided slightly closer to the opening end in the longitudinal direction of the mouth forming cavity 11. Since the annular projection 5 formed on the inner surface of the cylindrical mouth portion 2 is formed together with the blow molding of the chemical liquid plastic container 1 as will be described later, the cylindrical mouth portion 2 has a thin shape corresponding to the projection 5. A groove-like concave rib 13 is formed. For this reason, the rigidity of the cylindrical mouth portion 2 is improved particularly at the portion of the projection 5, and even when the rubber stopper 6 is press-fitted into the cylindrical mouth portion 2, the cylindrical mouth portion 2 is not bent or deformed. The rubber stopper 6 can be easily press-fitted into the cylindrical mouth portion 6.

  As shown in FIG. 3, the parison 14 is disposed between the divided molds 10, 10, and then the divided molds 10, 10 are closed and a pressure fluid is blown into the parison 14. An annular projection 5 is formed on the inner surface of the cylindrical mouth portion 2 by the projection portion 12 forming the following. The blown plastic container 1 for chemical liquid has a cylindrical mouth portion 2 sealed by a head portion 15, and a cutout for excising the head portion 15 at the boundary between the cylindrical mouth portion 2 and the head portion 15. A line (annular depression) 16 is formed. The blown molded plastic container 1 for chemical liquid is kept hygienic because the cylindrical mouth portion 2 is sealed at the head. When filling the chemical solution plastic container 1 with the chemical solution, the head 2 is cut from the resection line 17 to open the cylindrical mouth portion 2, and after filling with the chemical solution, the rubber plug 6 is press-fitted into the cylindrical mouth portion 2. Then, sealing is performed as shown in FIG.

  As shown in FIG. 3, the protrusions 12 of the molds 10 and 10 have a large standing height with respect to the thickness width, and even when the protrusion 6 has a thin width at the time of blow molding, the standing height is relatively high. Therefore, the rubber plug 6 press-fitted into the cylindrical mouth portion 2 is surely engaged with the projection 5 so that the rubber plug 6 is securely prevented from coming off from the cylindrical mouth portion 2. Can hold down.

  In the present invention, the annular projection 5 formed on the inner surface of the cylindrical mouth portion 2 may not necessarily extend over the entire circumference, and may be a projection formed in two or more arcs. it can. Further, the annular protrusion 5 is not necessarily a single line, but can be a plurality of lines of two or more lines to improve the meshing state with the rubber plug 6.

It is sectional drawing which shows a part of plastic container for chemical | medical solutions which concerns on one embodiment of this invention. It is a front view of the whole same as the above. It is a partial cross section figure which shows the blow molding aspect of the plastic container for chemical | medical solutions which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic container for chemical | medical solutions 2 Cylindrical mouth part 3 trunk | drum 4 bottom face 5 cyclic | annular protrusion 6 rubber stopper 7 concave part 8 thin part 9 flange part 10, 10 division mold 11 mouth part shaping | molding cavity 12 protrusion part 13 concave rib 14 parison 15 head 16 resection line

Claims (3)

A plastic container for a chemical solution that has a cylindrical mouth portion at one end, and is sealed by press-fitting a rubber stopper into the cylindrical mouth portion,
An annular projection is formed on the inner surface of the cylindrical mouth,
The rubber plug has an outer diameter slightly larger than the inner diameter of the cylindrical mouth,
The plastic plug for medicinal solution, characterized in that the rubber plug press-fitted into the cylindrical mouth portion is engaged with the protrusion by compression deformation of the portion that contacts the protrusion, and the rubber stopper is retained and prevented from falling into the cylindrical mouth portion. container.   2. The plastic container for medicinal liquid according to claim 1, wherein the rubber plug is formed in a concave shape in a portion to be press-fitted into the cylindrical mouth portion, and is formed in a thin shape with the top surface as a concave portion. It is a method of blow molding a plastic container for a chemical solution that has a cylindrical mouth part at one end and press-fits a rubber stopper into the cylindrical mouth part and seals it.
In the part that molds the cylindrical mouth portion of the split mold, an annular projection is formed with the split mold closed,
Place the parison between the split molds and blow the pressure fluid into the parison,
An annular protrusion is formed on the inner surface of the cylindrical mouth portion by the annular protrusion.

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