JPS63110196A - Method of incorporating cap - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for assembling a so-called pilfer-proof cap onto a mouthpiece of a bottle to prevent tampering before demand.

[Conventional technology]

Many pilfer-proof caps, which are a combination of a cylindrical cap body made of aluminum and a gasket, are used as means for sealing the mouth of a bottle.

This pilfer-proof cap is attached to the cylindrical wall of the cap body and the lower end of this cylindrical wall via the broken line using a specified jig, with the cap body with the packing attached fitted into the mouth tube of the bottle body. The assembled ring-shaped assembly piece is assembled to the mouthpiece by press plastic processing along the unevenness formed by the thread of the mouthpiece and the circumferential ring for locking. It is screwed onto the thread, and the assembled piece is engaged with the circumferential thread from below.

The Bilfer Bluff cap assembled to the mouthpiece of the bottle maintains its assembled state to the weir body by screwing into the thread on the cylinder wall, and the assembled piece maintains a ring-shaped appearance. By confirming that the cap has been opened, it can be determined whether the cap has already been opened.

In this way, with Pilfer Proof Camp, the part that is attached to the weir body is molded using the mouthpiece of the weir body as a mold, so there is no need to take into account molding errors between the cap and the weir body (therefore, there is no need to consider molding errors due to molding errors). It has the advantage of not producing any defective products, and it can be clearly determined whether the cap has been opened or not just by observing the condition of the cut groove formed on the assembly piece. This has the advantage of being highly effective in preventing unauthorized tampering.

[Problem that the invention seeks to solve]

Although the pilfer-proof cap has various excellent advantages, the sealing of the weir body is achieved only by the packing that is molded into a certain shape and assembled on the inner surface of the top wall of the aluminum cap body. The sealing of the weir body by this packing is achieved by pressing the packing, whose contact surface with the mouth pipe is pre-formed into a certain shape, onto the mouth pipe by the top pressure that is applied when assembling the camp to the weir body. This is achieved by being pressed against the end surface, so in order to obtain a stronger and more stable seal, the part of the seal that contacts the top surface of the mouth tube must be shaped exactly along the top surface of the mouth tube. It is required to be molded.

However, it is extremely difficult to perfectly match the shape of the contact surface of the gasket, which is formed into a certain shape in advance, with the upper end surface of the mouth tube. The force was never satisfactory and the seal was sometimes incomplete.

Of course, if the top pressure is made large enough so that the seal is pressed strongly against the top surface of the mouth tube, a fairly large sealing force can be obtained, but it is possible to obtain a fairly large sealing force by applying a large top pressure to the weir body. Not only will this result in improper deformation of the weir body, but also the elastic deformation force of the seal will increase, causing the inconvenience that the cap will be permanently deformed when the cap is assembled (the mouth part will be permanently deformed).
There has been a problem in that it is not always possible to obtain a large sealing force depending on the molding precision of the sealing surface of the packing.

These conventional problems and inconveniences arise from the attempt to achieve sealing of the weir body by bringing the weir body and the packing, which are molded completely separately, into contact with each other over the entire upper end surface of the weir body. No matter how high the dimensional accuracy of the weir body and packing is, with current molding technology, it is not possible to bring the contact surfaces of separately molded objects into complete close contact due to unpredictable shrinkage and deformation of the material. This is because it is almost impossible.

The present invention was devised in order to solve the problems and inconveniences in the conventional examples described above, and eliminates the mismatch in shape between the sealing surface of the packing and the upper end surface of the mouth cylinder of the weir body, which occurs due to separate molding. The final forming of the sealing surface of Punkin,
The technical problem is to achieve this by using the top pressure generated during press plastic forming of the cap body as a press forming force and by forming and drying using the upper end surface of the cap as the forming surface.

[Means and effects for solving the problem] The means of the present invention is an opening of a weir body 1 which has a thread 3 on its outer peripheral surface and a circumferential locking strip 4 below the thread 3. When assembling the pilfer-proof cap to the cylinder 2, a packing 12 made of liner material is stamped into a disk shape on the inner surface of the top wall 6 of the aluminum camping body 5 having a cylindrical shape. The combination with the packing 12 is fitted into the mouthpiece 2, and while applying top pressure (see Fig. 1) while the packing 12 is heated and softened (see Fig. 2),
The thread 11 formed on the cylindrical wall 7 of the cap main body 5 is screwed and assembled to the cap 2 by pressure plastic working using the spout 2 as a molding frame, and a break line 9 is inserted at the lower end of the cylindrical wall 7. The purpose of assembly is to lock the ring-shaped assembly piece 8 attached to the circumferential strip 4.

The packing 12 assembled into the cap main body 5 in a disk-shaped state is heated and softened during the press plastic processing of the cap main body 5, so that the cap main body 5
Due to the top pressure that acts during press plastic processing, the seal 1 is pressed against the upper end of the mouth tube 2.
The sealing surface, which is the contact surface with the upper end surface of the spout 2, is finally molded into its shape using the upper end surface of the spout 2 as the mold surface. 2. The surface shape perfectly matches that of the upper end surface.

In addition, the final shaping of the sealing surface shape of this packing 12 is as follows:
The packing 12 is simply heated and softened, and the other operations are simply assembling the cap body 5 to the spout 2, so the operation is easy and requires no particular trouble. No operation required.

Note that, as is clear from the above-mentioned object of the present invention, the degree of heating and softening of the packing 12 is sufficient as long as the lower surface portion of the packing 12, which is the liner material, is softened, and the entire packing 12 is heated and softened uniformly. This is not necessary at all, and therefore the time required to heat and soften the packing 12 can be extremely short, and the heating condition does not need to be uniform, making it extremely simple.

〔Example〕

In the embodiment shown in FIG. 1, after fitting the cap in which the packing 12 is heated and softened into the mouthpiece 2, the camp main body 5 is The pipe piece 7
are pressed and plastic-processed to be assembled to the mouth pipe 2 of the weir body 1, and the assembly piece 8 is engaged and assembled to the circumferential strip 4.

The assembly piece 8 of the camp body 5 is cut with a large number of longitudinal grooves 10, and when the camp body 5 is separated from the spout 2, the upward force acting on the cap , a pushing and spreading force acts on the mounting piece 8 that is locked to the circumferential strip 4, and this pushing and spreading force cuts the cutting groove 10 and transforms the mounting piece 8 into a form in which its lower part expands outward. to release the lock on the circumferential strip 4, and then the weir body 1 of the cap
This allows the cap to be removed from the cap, and the deformation of the assembly piece 8 indicates that the cap has been opened.

Further, FIG. 2 shows a case where heating and softening of the packing 12 is achieved by a heater 13 configured to be able to enter into the camp body 5, but this means that the heating of the packing 12 by the heater 13 is This is because instead of heating the entire packing 12, only the lower surface portion of the packing 12 where the sealing surface is formed is heated.

This is because if top pressure is applied with the entire packing 12 heated and softened, there is a risk that the entire shape of the packing 12, which has been press-molded into a fixed shape, may be improperly deformed, and this deformation may cause the cap body of the packing 12 to be deformed. This is because the assembling strength to the packing 12 is reduced, and this heating softening of the packing 12
This is because the purpose is to finally form the sealing surface located on the lower surface of the packing 12, so there is no need to heat and soften the entire packing 12.

〔Effect of the invention〕

As is clear from the above description, the present invention uses the top pressure, which is the force for assembling the cap to the weir body, as the final forming force for the sealing surface of the packing, so that the sealing surface of the packing is pressed against the upper end of the mouth tube. Since the final molding is performed using the mold surface, the sealing surface of the gasket can be perfectly aligned with the upper end surface of the mouth tube, thereby making it possible to obtain complete contact between the gasket and the upper end surface of the mouth tube. This makes it possible to achieve stronger sealing and holding of the weir body by the cap, and its assembly requires only a simple heating and softening treatment of the gasket in addition to the conventional cap assembly to the weir body. Therefore, it is easy to carry out, and furthermore, it exhibits many excellent effects such as achieving and maintaining high sealing even if the weir body has poor molding dimensional accuracy on the upper end surface of the mouth tube.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the method of the present invention, showing the state at the time when the press plastic working operation of the cap is completed. FIG. 2 is a longitudinal sectional view showing an embodiment of the packing heat softening treatment step in the method of the present invention. Explanation of symbols

Claims (1)

[Claims] A pilfer-proof cap for a mouthpiece (2) of a bottle body (1) having a thread (3) on the outer peripheral surface and a circumferential ring (4) for locking below the thread (3). In this assembly method, a packing (12) made of a liner material is molded into a disk shape on the inner surface of the top wall (6) of an aluminum cap body (5) having a cylindrical shape. The combination of (5) and packing (12) is fitted into the mouthpiece (2), and while applying top pressure while heating and softening the packing (12), the mouthpiece (2) is inserted into the mold. As a frame, the cylindrical wall (7) of the cap body (5) is screwed and assembled to the mouth tube (2) by pressure plastic working, and a break line (9) is inserted at the lower end of the cylindrical wall (7). A method of assembling a cap, in which a ring-shaped assembly piece (8) attached thereto is assembled and locked to the circumferential strip (4).