JPH0717464Y2 - Inside cap with spout - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a spout cap inner stopper, which prevents the occurrence of burr at the spout, a cap of a seasoning container, and other spout inner stoppers. The present invention can be applied to a container having a container or a container having a spout cap.

[Prior Art] In a conventional cap inner cap with a spout, the inner circumferential surface of the spout has a cylindrical surface and is molded by a mold 100 as shown in FIG.
That is, the spout pin 103, which is the mold part for molding the cylindrical inner peripheral surface of the spout 107, is abutted on the upper surface of the core 102, which is the mold part for molding the inner surface of the inner plug 101. Then, the upper part of the spout pin 103 is engaged with the upper mold 105, which is a mold part for molding the outer surface of the inner plug 101, and the molten resin is poured into the cavity 106 in a state where the cavity 106 is formed and cooled. It was hardened.

[Problems to be solved by the invention] However, in such a spout cap with spout, when the tip of the spout pin 103 abuts against the core 102 and wears to round the corners, a burr 108 is formed on the spout of the product. There is a problem that occurs.

It is considered that this is because the injection pressure is evenly applied to the inside of the cavity 106, so that the injection pressure 111 is almost the same in the space of the worn portion, and the resin easily enters.

Burrs are irregular and unsightly, require a deburring process, and if the burrs are not completely removed, they may fall off and become pieces of plastic that can get mixed into the contents. Wake up.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cap inner plug with a spout which hardly causes burrs at the spout when injection molding.

[Means for Solving the Problem] To this end, an inner cap with a spout according to the present invention has an engaging cylinder part having an engaging means for engaging with a container mouth and one end of the engaging cylinder part. A cap inner plug with a spout for a plastic injection-molded article, which has a spout to be connected and which has a cylindrical surface penetrating an inner surface and an outer surface, in the axial direction of the spout. The diameter of one of the tip end portions is characterized by providing a small inner diameter portion having an inner radius of 0.5 to 1 mm smaller than that of the remaining portion in the axial length range of 0.2 to 0.5 mm.

[Operation] With the spout cap with spout configured as described above, when molding the cap inner plug, the diameter of the spout is reduced by one step in the axial position range, and the upper surface of the core and the spout pin are Form a cavity with the abutment surface against the bottom surface,
Molten resin can be poured. Therefore, even if one of the core and the spout pin has a corner and the corner is worn, the worn portion is the portion of the cavity that is in contact with the small diameter portion of the spout pin, that is, It is located one step deeper than in the past and is located in a portion where the resin pressure is low, and it is difficult for the molten resin to enter up to this abraded portion, so burr is less likely to occur in the spout.

[Embodiment] Hereinafter, the details of the present invention will be described with reference to the drawings illustrating an embodiment.

In FIG. 1, reference numeral 1 is a cap inner plug with a spout. The inner plug 1 with the spout cap is made of plastic and is shown in a solidified state in the injection mold 2. The cap inner plug 1 with a spout includes an engagement cylinder portion 4 having an undercut 3 that is an engagement means for engaging with the container mouth portion, and a top plate portion 5 connected to one end of the engagement cylinder portion 4. The top plate portion 5 has a spout 8 which is a hole penetrating the inner surface 6 and the outer surface 7.

The spout 8 has a cylindrical surface, the diameter of which is one step smaller than the remaining portion 8b over the axial height h at one end in the axial direction of the spout, for example, the lowermost end, and A small inner diameter portion 8a having a step d is provided.

Next, a method for molding the cap inner plug 1 with the spout configured as described above will be described.

The mold 2 is a core 11 that is a mold part that molds the inner surface of the cap 1 with a spout, a spout pin 12 that is a mold part that molds the side peripheral surface of the spout 8, and a cap with a spout. An upper mold 13 which is a mold part for molding the outer surface of the stopper 1 and a mold part for peeling the solidified spout cap 1 with the lower end surface of the cap 1 with cap The stripper bush 14 which is

The core 11 is fixed at a fixed position, and the upper die 13, the spout pin 12, and the stripper bush 14 can be independently driven up and down. In FIG. 1, each is driven the lowest. It is in the state of being That is, the upper end of the spout pin 12 is abutted against the upper surface of the core 11 and the upper portion of the spout pin 12 is engaged with the upper mold 13 to form the cavity 15, and the cavity 15 is formed with the molten resin. When the mixture is poured, cooled and solidified, the cap inner plug 1 with a spout is molded. When the molten resin 16 is poured, even if the tip corner portion 12a of the spout 12 is worn away by repeated contact with the core 11, as shown in FIG. Is sufficiently weaker than the resin pressure 17 in the above, and as a result, the step d and the height h are set so that the molten resin 16 does not easily enter the abraded portion 12b, the core 11, the spout pin 12 and the abutting surface 18. Select the dimension of.

To remove the cap inner plug 1 with spout, first spout pin
It is sufficient to drive 12 upwards, then the upper mold 13 upwards and then the stripper bushing upwards.

For such dimensions of d and h, for example, when the material is soft polyethylene and the thickness of the top plate is 1.0 mm, d is 0.5 to 1.0 m.
m and h can be 0.2 to 0.5 mm.

A cap inner plug 1a with a spout according to another embodiment shown in FIG.
The nozzle 21 is provided on the outer surface of the spout. Also in this case, the molding method is exactly the same as that of the cap inner plug 1 with the spout, only by changing the shape of the upper mold 13a for molding the outer surface of the mold 2a according to the shape of the nozzle 21.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to obtain a cap inner plug with a spout that is less likely to cause burrs at the spout when injection molding.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a cap inner plug with a spout according to an embodiment of the present invention and a molding method therefor. The left half is a state where resin is solidified in a mold, and the right half is a metal. FIG. 2 shows a state where molten resin is injected into the mold, and FIG. 2 shows A in FIG.
FIG. 3 is an enlarged view of a portion, and FIG. 3 is a vertical cross-sectional view showing a spout cap inner stopper according to another embodiment of the present invention and a molding method therefor, the left half of which is a state where resin is solidified in a mold, The right half of the figure shows a state where molten resin is injected into the mold, and FIG. 4 is a vertical cross-sectional view showing the conventional molding method of a cap inner plug with a spout, and the left half of the figure shows the metal mold. The state where the resin is solidified in the mold, the right half figure shows the state where the molten resin is injected into the mold. 1 ... cap inner plug with spout, 2 ... mold, 5 ... top plate part, 8 ... spout, 8a ... small inner diameter part, 11 ... core, 12 ...
… Spout pin, 12a …… Corner of tip, 12b …… Abrasion part, 15
…… Cavity, 16 …… Molten resin, 17,17a …… Resin pressure,
18 …… Abutting face, 108 …… Bali

Claims (1)

[Scope of utility model registration request] 1. A cylinder having an engaging cylinder part having engaging means for engaging with a container mouth and a top plate part connected to one end of the engaging cylinder part, the top plate part penetrating an inner surface and an outer surface. In a cap inner cap with a spout of a plastic injection-molded product having a spout with a surface, the diameter of one end portion in the axial direction of the spout remains in the range of 0.2 to 0.5 mm in the axial direction. Cap inner plug with spout characterized by having a small inner diameter part whose inner radius is 0.5 to 1 mm smaller than in the part