JPH0478457B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is attached to an opening of a container such as a synthetic resin so as to close the opening, and is used for taking contents into and out of the container. It is related to the spout.

[Prior Art] Conventionally, a spout is made of a relatively flexible material such as a synthetic resin sheet to prevent the contents stored inside the container from flowing out and to reseal the contents after suction.
It is made by enclosing a spherical rubber inside the cast synthetic resin body, and sealing the mouth with an aluminum sheet.

However, in order to prevent the contents from flowing out, it is necessary to insert rubber that is larger than the diameter of the mouth opening.
Therefore, a special machine had to be used and a lubricant had to be applied to the rubber surface to make it slide better. For this reason, subsequent cleaning steps, such as cleaning the spout after filling it with rubber, were also time-consuming.

[Problems to be Solved by the Invention] In order to solve the above problems, as shown in Fig. 2, after molding the elastic body, a synthetic resin is secondarily molded around the outer periphery of the elastic body using a core rod. However, this method has the disadvantage that the hardness of the elastic body is involved, causing distortion in the elastic body, which in turn causes distortion in the resin, resulting in poor molding or inability to mold.

[Means for Solving the Problems] In order to solve the above problems, the method for manufacturing a synthetic resin spout of the present invention includes a cylindrical spout having a hollow portion and at least one hole penetrating from the hollow portion to the outside in the end wall. a step of molding a main body having a mouth part and a liquid path connected to the mouth part and communicating with the hollow part; inserting the body into the hollow part of the mouth, and molding a crown part that passes through the outer periphery of the mouth and the hole, covers the annular recessed part on the outer periphery of the elastic body, and is fused to the main body and the elastic body. It is characterized by having the step of.

Further, the synthetic resin spout of the present invention has a hollow portion and a cylindrical mouth portion having at least one hole in the peripheral wall that penetrates from the hollow portion to the outside, and is connected to the mouth portion;
a main body provided with a liquid path penetrating the hollow part; an elastic body inserted into the hollow part of the mouth part and having an annular recess corresponding to the hole on its outer periphery; and an elastic body that penetrates the outer periphery of the mouth part and the hole. The elastic body is characterized by comprising a crown portion that covers an annular recessed portion on the outer periphery of the elastic body and is fused to the main body and the elastic body.

[Function] The present invention includes a hollow part, a cylindrical mouth part having at least one hole in the peripheral wall that penetrates from the hollow part to the outside, and a liquid path connected to the mouth part and communicating with the hollow part. a step of molding the provided main body; a step of inserting an elastic body having an annular recess provided on the outer periphery to correspond to the hole into the hollow portion of the mouth portion; and a step of inserting an elastic body into the hollow portion of the mouth portion and passing through the outer periphery of the mouth portion and the hole. and molding a crown portion that covers the annular recessed portion on the outer periphery of the elastic body and is fused to the main body and the elastic body,
The resin poured in the secondary molding will flow through the hole in the main body and into the outer annular recess of the elastic body. Therefore, even if the stored contents leak out along the outer periphery of the elastic body, it will be completely prevented by the protruding portion of the secondary molded resin molded on the annular portion of the outer periphery of the elastic body toward the elastic body side. become.

In addition, the second molded resin that forms the crown is
Since it penetrates the primary molded main body and reaches the annular portion on the outer periphery of the elastic body, the main body, the elastic body, and the crown are brought into closer contact and are fused and fixed to each other.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional side view showing an embodiment of the spout of the present invention.

First, in primary molding, the main body 1 is injection molded from a synthetic resin such as polypropylene or polyethylene resin using a mold. This body 1 is hollow and has at least one
It has a cylindrical mouth part 2 with holes 4 penetrating the outer circumferential wall from the hollow part in places, and a corner part is cut out, and a liquid passage 7 is provided from the main body side to the hollow part of the mouth part through the wall 10. A protrusion 6 is provided.

Next, the elastic body 3, which is solid cylindrical and has a recess on its outer periphery and has approximately the same diameter as the inner diameter of the hollow part, is inserted into the hollow part. In this case, a recess 5 is provided on the outer periphery of the elastic body 3 so as to face the opening position of the hole 4 provided in the main body 1. Therefore, the position of the belt-shaped recess 5 at the center of the outer circumference of the elastic body 3 and the hole 4 match, and the entire circumference of the outer circumference of the elastic body 3 forms a ring-shaped empty part through the hole 4 from the outside. .

In this state, secondary molding is performed using a second mold, and the crown part 8 covering the mouth part is injection molded from the same synthetic resin as the main body 1. At this time, the injected synthetic resin passes through the hole 4 provided in the mouth swing 2 of the main body 1 and goes around into the annular recessed part 5 at the center of the outer periphery of the elastic body 3 and is hardened. As a result, the main body 1, the elastic body 3, and the crown portion 8 are fused together.

Further, the center portion of the upper wall of the second molded crown portion 8, that is, the mouth portion top portion 9 which is the portion in contact with the elastic body 3, is molded with as thin a resin as possible.

After molding the spout, when the lower part of the main body 1 surrounding the liquid path 7 is sandwiched between sheet-like containers and fused, the protrusion 6 has a cut-off corner, so that the resin is not absorbed by the fusion. Even if melting occurs, it is not noticeable enough to cause a lack of uniformity in the container, and the spout and the container can be fused together.

When using the spout manufactured by the above method, first, a hollow needle or the like is inserted into the liquid path 7 from the mouth top 9, and the contents inside are aspirated through this needle.

As mentioned above, the mouth top 9 is thinly molded, so that it can be easily pierced with a needle. When the contents are sucked, the contents inside the sheet tend to leak out not only through the small holes when sucked out, but also through the space between the elastic body 3 and the main body 1. However, since the spout of the present invention is made of synthetic resin molded into the outer annular recess 5 of the elastic body 3 through the hole 4 of the main body 1, the seeped contents are not as shown in FIGS. The annular portion will prevent leakage.

Further, due to the above-described configuration, the mouth portion 2, elastic body 3, and crown portion of the main body 1 are fixed in close contact with each other.

Note that the hole is not limited to one location, but may be provided in several locations.

In this case, the effect is that the resin poured through this hole becomes more uniform.

In the above embodiments, a cylindrical opening is shown, but the opening may have any shape.

In addition, since the elastic body prevents the contents from leaking in the annular recess, if the size is close to the inner diameter of the hollow part, even if it is approximately the same diameter as the inner diameter of the hollow part as in the example, it will be slightly larger. However, it may be slightly smaller.

Further, in the embodiment, the liquid path 7 and the hollow portion are in contact with each other via the wall 10, but this wall may not be provided.

[Effects of the Invention] As explained above, according to the present invention, the diameter of the elastic body can be made smaller than the diameter of the hollow portion of the mouth portion, so it is very easy to insert the elastic body into the hollow portion. Therefore, it is possible to eliminate the conventional process of inserting the elastic body using a special machine, applying lubricant for insertion, and cleaning the elastic body.

Furthermore, since the synthetic resin forming the crown reaches the annular recess on the outer periphery of the elastic body and is fixed therein, it is possible to provide a reusable product that does not leak when spouted. Furthermore, since the entire outer periphery of the elastic body is covered with synthetic resin, there is no need to seal the opening with an aluminum sheet or the like.

Furthermore, since the flattened protrusion is cut out appropriately depending on the size and wall thickness of the spout, when the spout is attached to the container by welding, the molten resin does not protrude and is fused uniformly. Defects due to non-uniform wall thickness can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the spout of the present invention. FIG. 2 is a partial cross-sectional side view of a spout in which resin is molded around the outer periphery of an elastic body. 1...Main body, 2...Mouth, 3...Elastic body, 4...
... hole, 5 ... recess, 6 ... protrusion, 7 ... liquid path, 8 ... crown, 9 ... mouth top, 10 ... wall.

Claims (1)

[Scope of Claims] 1. A hollow part, a cylindrical mouth part having at least one hole in the peripheral wall that penetrates from the hollow part to the outside, and a liquid path connected to the mouth part and communicating with the hollow part. a step of molding the provided main body; a step of inserting an elastic body having an annular recess provided on the outer periphery to correspond to the hole into the hollow part of the mouth; A method for manufacturing a synthetic resin spout comprising the step of molding a crown part that covers an annular concave portion on the outer periphery of an elastic body and is fused to the main body and the elastic body. 2. A main body provided with a hollow part, a cylindrical mouth part having at least one hole in the peripheral wall that penetrates from the hollow part to the outside, and a liquid path connected to the mouth part and communicating with the hollow part; Insert into the hollow part of the mouth, around the outer periphery,
an elastic body having an annular recess corresponding to the hole; and a crown that passes through the outer periphery of the mouth and the hole, covers the annular recess on the outer periphery of the elastic body, and is fused to the main body and the elastic body. Equipped with a synthetic resin spout.