JPS5837814Y2 - Cap for extruded tube with blind lid - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a novel cap for extruded tubes with a blind lid.

Traditionally, it is filled into extruded tubes.

In order to keep the contents completely sealed until use, an extruded tube with a blind lid is widely used, in which a blind lid is integrally formed at the upper end of the neck of the tube container.

The cap that is screwed onto the mouth of such an extruded tube with a blind lid usually has a protrusion on the back surface of the top plate for piercing the blind lid, as shown in FIG. (FIG. 1 is a schematic partially cutaway front view showing a typical example of a conventional extruded tube cap with a blind lid in a temporarily tightened state.

) However, a normal extruded tube cap is screwed halfway up the neck of the extruded tube to prevent the blind lid from breaking during the capping process during the container manufacturing process (Figure 1).
The cap is temporarily tightened so that the user can firmly screw in the cap and break the blind lid to open it.

However, in the normal capping process, there are variations in the tightening torque of the cap during the temporary tightening, and as a result, there is a risk that the blind lid will be torn during the capping process, and even after the temporary tightening, careless handling may occur. The drawback is that troubles such as the blind lid being torn before use are likely to occur.

In order to eliminate such drawbacks, the applicant first formed a plurality of thin-walled grooves in the lower hem of the cap, which has an outer diameter approximately equal to the body of the tube container, and temporarily tightened the lower end of the hem. An extruded tube with a blind lid that is brought into contact with the shoulder of a tube container and further screwed in during use so that the lower end of the hem fits into the upper end of the body, and at the same time the blind lid is broken by a protrusion. (Utility Model Registration Application No. 1502 of 1980, Utility Model Registration No. 1502,
6-103440).

In such extruded tube caps, the lower end of the cap is temporarily tightened in the capping process on the outer periphery of the shoulder at the upper end of the tube container, so the blind lid is not broken in the capping process. ), and has the advantage of greatly reducing the occurrence of troubles such as the cap being accidentally tightened before use and breaking the blind lid.
Opening) must be done by pushing the bottom end of the cap apart and screwing the cap firmly into place so that it fits into the top end of the body.
There still remained problems in handling during use.

This invention eliminates the problem of sloping up, makes it possible to reliably temporarily tighten the blind lid without accidentally tearing it during the capping process or before use, and makes it extremely easy to tear the blind lid during use. The present invention provides a new cap for an extruded tube with a blind lid that is extremely easy to handle.

Therefore, the present invention provides a cap for an extruded tube with a blind lid in which a protrusion is provided on the back surface of the cap top plate for piercing the blind lid formed at the upper end of the neck of the tube container by screwing the cap. is made of a plastic material with a thin lower hem, the hem has an outer diameter equal to or slightly smaller than the outer diameter of the body of the tube container, and the blind lid is screwed into the body. The gist of the present invention is a cap for an extruded tube with a blind lid, in which the hem part has a bellows-like cross-sectional shape so that the hem part is fitted onto the upper end of the shoulder of the tube container when punching.

Hereinafter, the cap of the present invention will be explained using the drawings.

FIG. 2 is a schematic partially cutaway front view showing an embodiment of the cap of the present invention in a temporarily tightened state, and FIG. 3 is a schematic partially cutaway front view showing the cap shown in FIG. 4 is a schematic partially enlarged cross-sectional view showing one embodiment of the lower hem of the cap of the present invention, and FIG. 5 is a temporarily tightened state of another embodiment of the cap of the present invention. FIG. 2 is a schematic partially cutaway front view shown in FIG.

In FIGS. 2 and 3, 1 is a cap according to the present invention, and the cap 1 has an internal thread 11 formed on its inner circumferential surface so as to be screwed into the neck 21 of the tube container 2, and a top plate 12. It has a protrusion 3 for perforating the blind cap.

The tube container 2 has a neck portion 21 with a blind lid 4 integrally formed on the upper end. Consisting of a shoulder section 22 and a body section 25, the neck section 21
A cap screwing body external thread 24 is formed on the outer peripheral surface of the cap.

In the present invention, the cap 1 has a thin hem portion 13 at the bottom.
(usually approximately the lower half of the cap 1), and is obtained by integrally molding a plastic material such as polyethylene, polypropylene, or nylon.

The bottom end of the hem 13, which is a feature of the present invention, comes into contact with the shoulder 22 of the tube container 2 in the temporary tightening in the capping process, as shown in FIG. 2, and is stopped at that position. Even if a force exceeding the predetermined tightening torque is applied due to variations in torque, the hem portion 13 is cylindrical in the axial direction, and its cross-sectional shape is bellows-like. It is strong against axial forces, and can almost completely prevent the blind lid 4 from being torn due to variations in tightening torque during temporary tightening or careless handling before use.

Furthermore, when the blind lid 4 is perforated by tightening, since the hem 13 is thin, it is extremely flexible against radial forces, and the hem 13 has a transverse shape. Since it is shaped like a bellows, it is easy to expand to substantially widen its diameter, and therefore, when in use, the hem 13 can be rotated very smoothly by tightening it with a slight force by the user. sliding outwardly on the shoulder 22;
As shown in FIG. 3, the lower end portion 13a is fitted onto the body portion 23, and at the same time the blind lid 4 is torn by the protrusion 3 of the cap top plate 12.

Such effects of the present invention can only be achieved by forming the cross-sectional shape of the hem portion 13 into a bellows shape.

The bellows-shaped hem 13 in the present invention has a thickness of about 0.2 to 1
As shown in FIG.
3 is preferably formed in a bellows shape so that when expanded in the radial direction, the area is approximately equal to or slightly larger than the outer diameter of the body 23, and the distance X and the opening angle in FIG. Y can be determined as appropriate depending on the diameters of the cap 1 and the body 23.

By the way, to give an example, the outer diameter of the body part 23 of the tube container 2 is 15.85 mmφ, the wall thickness of the hem part 13 is 0.4 mm, and the outer diameter (distance from the axis to the top of the mountain, the same applies hereinafter) is 15. .50 mmφ, the distance X shown in Figure 4 is 0, 78 mm, and the opening angle Y is approximately 114 mm.
The bellows-shaped hem 13 is formed so that the hem 1
This is preferable for bringing the lower end portion 13a of No. 3 into close contact with the outer circumferential surface of the body portion 23.

Thus, when tightening, the hem portion 13 slides and rotates outward on the slope of the shoulder portion 22 while widening the distance X and the opening angle Y (while extending), fits into the body portion 23, and is screwed in as it is. It is inserted into the body part 23 until it is completely finished.

The outside diameter of the hem 13 is preferably equal to or slightly smaller than the outside diameter of the body 23 of the tube container 2. For example, the outside diameter of the body 23 and the outside diameter of the hem 13 are The ratio can be appropriately determined within the range of about 1:1 to 0.5.

When the outer diameter of the hem 13 is smaller than the above range with respect to the outer diameter of the body 23, even if the lower end 13a of the hem 13 expands in the radial direction during tightening, the outer diameter of the body 23 of the tube container 2 This is not preferable because it tends to be difficult to fit into the body 23 because it cannot be larger than the size of the body.

In the present invention, it is preferable that the entire circumferential surface of the hem portion 13 is formed in a bellows shape as shown in FIGS. 2 and 3.
If necessary, they may be formed in a bellows shape at appropriate intervals as shown in FIG. 5, or may be partially formed in a bellows shape.

Further, the cap 1 shown in FIGS. 2 and 3 has a spouting tube 5 on the top plate 12, but as shown in FIG. Of course, it may be 1a.

Since the cap 1 or 1a of the present invention is temporarily tightened in the capping process, the lower end of the hem 13 is held in contact with the shoulder 22 of the tube container 2. There is no risk that the lid 4 will be torn by the protrusion 3, which makes it possible to automate the capping process and greatly contributes to lower manufacturing costs. Problems such as breakage of the cap are almost completely prevented, and even when the blind lid 4 is opened by tightening the cap 1 or 1a during use, the user can tighten the cap 1 or 1a with a slight force, making it extremely smooth. The lower end portion 13a of the hem portion 13 fits into the body portion 23, resulting in the remarkable effect that the blind lid 4 can be opened extremely easily.

Furthermore, in the present invention, the lower end 13a of the hem 13 of the cap 1, 1a is fitted to the upper end of the body 23 of the tube container 2, thereby sealing the opened mouth and neck 21 of the tube container 2. It is extremely hygienic as it can be kept in a clean state and does not attract dust.
This is particularly preferred when the contents are pharmaceuticals or foods.

As described in detail above, the cap 1 or 1a of the present invention can eliminate all the drawbacks of the conventional extruded tube cap with a blind lid, and is of great practical value.

[Brief explanation of the drawing]

Fig. 1 is a schematic partially cutaway front view showing a representative example of a conventional extruded tube cap with a blind lid, and Fig. 2 is a schematic partially cutaway front view showing an embodiment of the cap of the present invention in a temporarily tightened state. Figure 3 is a schematic partially cutaway front view showing the state when the cap of Figure 2 is screwed in and tightened, and Figure 4 is a schematic diagram showing an embodiment of the lower hem of the cap of the present invention. FIG. 5 is a schematic partially cutaway front view showing another embodiment of the cap of the present invention in a temporarily tightened state. Main symbols in the drawings 1, 1 a: cap, 2: tube container, 3: protrusion, 4: blind lid, 5: pouring tube, 12: top plate, 13: hem, 23: body.

Claims (1)

[Claims for Utility Model Registration] 1. A cap for an extruded tube with a blind lid, which has a protrusion on the back side of the cap top plate for piercing a blind lid formed at the upper end of the neck of the tube container, when the cap is located downward. The hem is made of a plastic material with a thin hem, and the hem has an outer diameter equal to or slightly smaller than the outside diameter of the body of the tube container, and when the blind lid is punched by screwing, the hem extends in the radial direction on the shoulder of the tube container, and the hem portion has a bellows-like cross-sectional shape so as to be fitted onto the upper end of the body of the tube container. cap. 2. The cap according to claim 1 of the utility model registration claim, which is provided with a spouting pipe on the top of the cap top plate.