JPS6089337A - Method of sealing plastic bag - Google Patents

Abstract

PURPOSE:To seal the mouth section of a transfusion bag or the like of a crosslinked soft plastic quite efficiently and positively, by attaching a ringlike cap using an injection mold. CONSTITUTION:After a soft plastic bag 1 that has been produced by crosslinking a resin having no heat resistance is filled with a liquid agent, a relatively thin intermediate plug 2 for example of a polyvinyl chloride is put on an enlarged mouth section 3 of the mouth section 7. Then a rubber material 5 having an outer diameter fittable to the inner diameter of the enlarged mouth section 3 is inserted into the inner plug 2. Thereafter, the mouth section 7 is placed in a mold 6 for injection molding a ringlike cap followed by injection molding a synthetic resin. Thus, a ringlike cap 8 is firmly secured to the upper edge section of the enlarged mouth section 3, and the end peripheral section 4 of the intermediate plug 2 and the upper surface section of the rubbery material plug 5 are held.

Description

[Detailed Description of the Invention] Regarding the method of sealing the opening of the cap, in detail, after inserting a rubber plug into the plastic nozzle through the inner plug of a soft resin material, It is well known that in recent years, soft plastic bags have been widely used instead of glass bottles for containers containing liquid medicines, which have a ring-shaped cap attached using a mold.

Most soft plastic bags for chemical solutions currently on the market are made of flexible polyvinyl chloride, but migration of the plasticizer contained in these materials into the drug solution has been seen as a problem with these materials.

There are other possible materials for this soft plastic bag, but I have yet to find one that is heat resistant enough to withstand high-pressure steam sterilization.

Therefore, recently, techniques have been developed to crosslink resins and increase their heat resistance by irradiating resins with no heat resistance with electron beams.

However, since this heat resistance improvement is usually carried out with an empty bag that is not filled with a chemical solution, it has become difficult to seal the opening of the bag after filling the bag with a drug solution.

That is, the mouth of a drug solution sealed container is generally sealed with a rubber stopper, but this rubber stopper is attached via a membrane to prevent direct contact with the drug solution. If the bag is made of polyvinyl chloride as mentioned above, this comb stopper can be used, for example, in
-, proposed in No. 166243 It is possible to heat-seal a plastic acid cap to the bag opening to hold it in place, but with a cross-linked resin, heat-sealing is not possible and a rubber stopper cannot be used. There is a problem in that it cannot be tightly fixed to the bag opening.

The present invention has been proposed in view of the current situation.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. First, as shown in FIG. After filling the medicinal solution, a relatively thin inner stopper 2 made of polyvinyl chloride or the like is placed on the enlarged opening 3 of the opening 7, as shown in FIG. At this time, the inner stopper 2 has an end edge 4
It is preferable to make it so that it covers the upper surface of the widened part 3.

Next, as shown in FIG. 3, a rubber stopper 5 having an outer diameter matching the inner diameter of the enlarged opening 3 is inserted from above the inner stopper 2.

Thereafter, as shown in FIG. 4, the mouth portion 7 is placed in an injection mold 6 for molding a ring-shaped cap, and injection molding is performed using a synthetic resin.

As a result, as shown in FIG. 5, the ring-shaped cap 8 is firmly attached to the upper edge of the enlarged opening 3, and at the same time, the edge 4 of the inner stopper 2 and the upper surface of the rubber stopper 5 are pressed down. .

According to the present invention as explained in the Act, the ring-shaped cap is attached using an injection mold, and the mouth can be sealed very efficiently especially when cross-linked soft plastic is used as an infusion bag. Invention 4 has excellent effects, such as being able to reliably carry out both operations.

[Brief explanation of drawings]

The attached drawings are all explanatory diagrams showing embodiments of the present invention, and FIG. 1 shows a state in which the drug solution is filled, FIG. 2 shows a state in which the inner stopper is attached, and FIG.
FIG. 3 shows the state in which the rubber stopper is attached, FIG. 4 shows the state in which the ring-shaped cap is molded using an injection mold, and FIG. 5 shows the structure of the bag opening completed according to the present invention. 1 is a bag, 2 is an inner stopper, 3 is an opening, 4 is an edge, 5 is a rubber stopper, 6 is an injection mold for forming a cap, 7 is a mouth, and 8 is a ring-shaped cap. be. Applicant: Kawasumi Chemical Industry Co., Ltd. Representative: Shigeru Nishino, Patent Attorney Figure 1↓ Volume 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] After filling the plastic bag lug with the filling, insert the rubber stopper into the bag opening through the soft resin inner stopper, then place the opening into an injection mold for forming the cap, and insert the synthetic resin n
A method for sealing a plastic bag, comprising carrying out injection molding according to the purpose, and holding the rubber stopper and the inner stopper in the mouth part with a molded cap.