JP3062281B2 - Molding method for bag-made synthetic resin containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for accommodating a liquid or a cream-like material, and for mounting a dispenser therefor.
The present invention relates to a method for forming a bag-containing synthetic resin container.

[0002]

2. Description of the Related Art A bag made of synthetic resin, for example, has a bag mouth containing a cream-like material attached to the lower end of a pump, and the bag and the pump are attached to the inside of the container so that the inside of the pump is moved upward from the inside of the container. A head with a nozzle is attached to the upper end of a stem that stands up, and the head is moved up and down to suck the cream inside the bag into the pump and discharge the cream inside the pump from the nozzle. The shrinkage of the bag together with the reduction of the cream-like material due to the discharge prevents the cream-like material in the bag from coming into contact with air, thereby preventing the loss of fragrance and the like and the oxidation of the cream-like material. It is provided to be able to.

[0003] In such a bag-containing synthetic resin container, conventionally, a container body and a bag are separately formed, the bag is put in the container body, and a cylindrical body attached to the bag mouth is attached to the container body. After being attached to the inner surface of the mouth and neck, a fluid such as cream is put into the bag, then the cylinder of the pump is placed in the bag and the mounting cylinder of the pump is attached to the outer surface of the mouth and neck of the container. Was.

[0004]

In the above-mentioned conventional bag-made synthetic resin container, it is troublesome to store the bag in the container.
In addition, there is a trouble in that a mounting cylinder to be attached to the inner surface of the mouth of the container body must be attached to the bag mouth.

The present invention has been made to eliminate such drawbacks and to make it possible to easily and quickly mold a bag-made synthetic resin container.

[0006]

The parison 5 is dripped into a synthetic resin container 1 in which an air flow hole 2 is formed at the bottom and the mouth and neck 3 is erected from the upper end of the trunk via the shoulder. Then, the parison is inflated by blowing high-pressure air into the parison to form a thin and flexible bag-like portion 6 whose outer surface is in close contact with the inner wall surface of the container. The remaining upper parison is cut off and molded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as shown in FIG. 1, a preformed synthetic resin container 1 is prepared. The container body has an air flow hole 2 formed in the center of the bottom wall, and stands up the mouth and neck 3.
A longitudinal groove 4 may be provided on the inner surface of the mouth and neck to prevent rotation of the bag mouth as described below.

The parison 5 is hung down into the container and expanded by blowing high-pressure air into the parison to form a thin and flexible bag-like portion 6 whose outer surface is in close contact with the inner wall of the container. . As shown in FIG. 1, the high-pressure air is blown by holding the mouth and neck 3 of the container body 1 and the parison above the mouth and neck by the molds 7, 7 and cutting the parison at the mold upper surface position. As shown in FIG. 2, the high-pressure air blowing nozzle 8 may be inserted into the parison cutting portion, and the parison cutting portion 9 may be airtightly sandwiched between the upper surface of the mold and the upper and outer peripheral portions of the nozzle. The inside diameter of the cavity portion immediately above the mouth-neck portion of the mold is the same as the outside diameter of the mouth-neck portion 3 so that the mouth-neck portion of the bag-shaped portion 6 is formed.
It is preferable that an outward flange 10 be formed at the upper end of 6a. The bag-shaped portion has a thin and flexible thickness, and is formed so as to be contractible by reducing the pressure in the bag-shaped portion. After forming the bag,
As shown in FIG. 3, the parison portion is cut along the upper surface of the outward flange 10 to obtain a bag-containing container.

The outer container body 1 and the bag-like portion 6 in the container body may be formed of different synthetic resin materials in order to prevent the adhesion therebetween. For example, the container body is made of nylon or PVC. The bag 6 is formed of polyethylene.

[0010]

As described above, according to the present invention, the parison 5 is suspended in the container body 1 and the bag-like portion 6 is formed by the parison blow molding. The shape of the outer surface of the bag can be made to exactly match the shape of the bag, so that the size of the container body and the bag do not match and the mismatched portion is not wasted as in the case where a separately provided bag is put into the container body. Since the mouth and neck portion 3 of the container body is smaller in diameter than the body portion, it is troublesome to push the bag body portion into the container body body portion through the mouth and neck portion 3. In this case, since a parison is formed by putting the parison into the container body and then expanding the parison, the above-mentioned troublesome work is not required. Further, when inserting the bag into the container, a tube is attached to the bag opening to prevent the bag opening from dropping into the container, and the body is fitted to the inner surface of the container opening neck. However, in the present invention, since the bag body is formed by parison expansion as described above, the mouth and neck of the bag do not expand much due to close contact with the inner wall surface of the container body, It is convenient to naturally form the cylindrical portion fitted to the inner surface of the container body neck.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state where a parison is inserted into a container body.

FIG. 2 is a cross-sectional view showing a state where a parison inserted into a container body is blown and expanded.

FIG. 3 is a half sectional view of a container formed by the method of the present invention.

[Explanation of symbols]

 1 container body 5 parison 6 bag-shaped part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-184833 (JP, A) JP-A-62-28345 (JP, A) JP-A-49-34913 (JP, A) 149328 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 49/00-49/80 B65D 23/00-25/56

Claims (1)

(57) [Claims] A parison (5) is suspended in a synthetic resin container body (1) having an air flow hole (2) formed in the bottom and a mouth and neck (3) standing up from the upper end of the trunk via a shoulder. The upper parison portion remaining above the mouth and neck of the container body after being expanded by blowing high-pressure air into the inside to form a thin and flexible bag-like portion 6 whose outer surface is in close contact with the inner wall surface of the container body. A method for molding a synthetic resin container in a bag, characterized by cutting and removing the resin.