JPH0199948A - Cap and bottle mouth assembly - Google Patents

Abstract

PURPOSE:To maintain air-tightness when exposed to heat, by providing in un even portion which a liner tightly contacts around the upper end face of a bottle mouth. CONSTITUTION:An assembly consists of a bottle mouth 1 and a cap 2 tightly which contacts the upper end surface of the mouth 1 by virtue of the deforma tion of a liner 4 set inside a main body 3 assembled to the mouth 1. An uneven portion 5 is provided on the upper end surface of the mouth 1 so as to be close contact with the liner 4. If the uneven portion 5 is in the form of a recessed groove, a bypass groove 6 is formed to connect the uneven portion 5 to the inside of the bottle. With the cap 2 (with a liner 4 inside the main body 3) mounted to the mouth 1 (with an uneven portion 5 on its upper end surface), the liner expands by heat generated when the content is filled at high temp. or heat treated and goes soft. The liner thus plastic-deformed to be compatible with the upper end surface of the mouth 1 is tightly assembled to the cylinder. When cooled, the liner 4 is shrink-deformed and shifts inward to firmly engage the outer periphery surface of the uneven position 5 for high air tightness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for assembling a culture medium containing contents to be filled at high temperature or heat treated (retort treatment) and a cap that is assembled to the mouthpiece of the bottle. It's about structure.

[Conventional technology]

Conventionally, as a means for providing airtightness to a culture medium containing contents that is filled with contents at high temperature or subjected to heat treatment after filling, a cap with a liner 4 provided on the inner surface of the main body 3 is used, as shown in Fig. 5. The body 2 was assembled to the bottle mouthpiece 1, and airtightness was maintained by close surface contact between the liner 4 and the lower surface of the bottle mouthpiece 1.

[Problems to be Solved by the Invention] However, problems with such prior art include the weir body, the cap body 2. Another problem is that the liner 4 on the inner surface of the cap body 2 expands and contracts, resulting in a decrease in airtightness. When filling the contents at a high temperature or performing heat treatment after filling the contents, weir bodies and cap bodies 2. and liner 4
expands and contracts differently. In particular, since the liner 4 is molded from a soft polymer material, it expands and contracts significantly when heated and cooled. Therefore, 1. For example, after filling the contents at high temperature,
When the cap body 2 is assembled to the bottle mouthpiece 1, the liner 4 on the inner surface of the cap body 2 is softened and expanded by the heat of the high-temperature contents. Then, in a softened and expanded state, it is tightly assembled to the upper end surface of the mouthpiece 1, and is plastically deformed while maintaining a shape that fits the shape of the upper end surface of the mouthpiece 1. Therefore, in this state, the one-mouth cylinder 1 and the liner 4 are tightly assembled, and the weir body has excellent airtightness. However, as the temperature of the contents decreases, the liner 4 also cools down.
As a result, the liner 4, which has a shape adapted to the upper end surface of the mouthpiece 1 in the expanded state, undergoes shrinkage deformation and is deviated from its original assembly with the upper end surface of the mouthpiece 1. When this deviation occurs, the tight assembly between the upper end surface of the single-port cylinder 1 and the liner 4 is broken, which tends to result in a decrease in airtightness.

The present invention was devised in view of these points.

It is an object of the present invention to provide an assembly structure of a cap and a bottle mouthpiece in which airtightness is not impaired by heat when performing high-temperature filling or heat treatment.

[Means for solving problems]

Therefore, the bottle neck l and the liner 4 assembled to the bottle neck l and provided on the inner surface of the main body 3 are deformed, and the bottle neck l
The cap body 2 is in close contact with the upper end surface. Then, a concavo-convex portion 5 was provided around the upper end surface of the bottle mouthpiece 1, with which the liner 4 closely abuts.

In addition, when the uneven portion 5 is formed into a groove shape, the uneven portion 5
A groove 6 is formed in the groove 6 to communicate the inside of the bottle.

[Effect]

This will be explained with reference to FIG. In a state where the cap body 2 having a liner 4 on the inner surface of the main body 3 is assembled to the bottle mouthpiece 1 having an uneven portion 5 on the upper end surface, the liner 4 absorbs heat when the contents are filled at high temperature.

Alternatively, it is heated by heat during heat treatment, expands, and becomes softened, plastically deforming into a shape that fits the upper end surface of the two-neck cylinder 1, and tightly assembled with the nine-mouth cylinder 1.

When cooling starts from this tightly assembled state, the liner 4 undergoes shrinkage deformation, shifts inward, and is firmly assembled to the outer circumferential surface of the uneven portion 5, and this strong assembly provides high airtightness.

Furthermore, this displacement of the liner 4 is minimized by the liner 4 coming into contact with the outer circumferential surface of the uneven portion 5.
The tight assembly between the liner 4, which has been plastically deformed and adapted to the upper end surface of the spout 1, and the upper end surface of the spout 1 is maintained almost as it is, and this also provides high airtightness.

Note that when the liner 4 contracts, if the entire liner 4 shifts inward equally, the tight assembly between the liner 4 and the outer circumferential surface of the uneven portion 5 will provide airtightness. If there is a part that shifts outward, as opposed to a part that shifts inward, that part is tightly assembled to the inner circumferential surface of the liner 4, and the assembled part provides airtightness. Become something to do.

When the uneven portion 5 is shaped like a groove, the air inside the uneven portion 5 is sometimes removed when the cap body 2 is assembled by forming a groove 6 that communicates the uneven portion 5 with the inside of the bottle. Since the removal can be allowed to escape through the groove 6, the liner 4 can penetrate into the uneven portion 5 and be tightly assembled. Further, this groove 6 serves as a passage not only for air but also for the contents that have entered the uneven portion 5.

〔Example〕

An example is shown in FIG. This shows an assembly structure of a synthetic resin weir body and a pull-top type cap body 2 assembled thereto. Here, the uneven portion 5 on the upper end surface of the mouthpiece 1
has a convex shape, and both peripheral surfaces forming the uneven portion 5 are formed by vertical surfaces 8 along the weir axis direction. Uneven part 5
By forming the vertical surface 8, higher airtightness can be obtained. For example, if the uneven portion 5 is semicircular, the liner 4 will move around the semicircular uneven portion 5 when the liner 4 is displaced.
It is not possible to obtain a strong and tight assembly as the uneven part 5 rides on a vertical surface, and it is also difficult to reliably prevent displacement, and therefore it is not possible to achieve high airtightness. By setting the number 8, such adverse effects do not occur, and therefore, high airtightness can be achieved.

FIG. 2 shows another embodiment. This is because the cap body 3 is made of aluminum.

After the cap body 2 is assembled, the outer circumferential end thereof is press-deformed to form a press-deformed portion 7, thereby improving the airtightness between the liner 4 and the outer circumferential end of the spout 1. When the cap body 2 is pressed and deformed in this way, the liner 4 is thereby elastically deformed, and the elasticity generated in the liner 4 brings the cap body 2 into closer contact with the spout 1.

Still other embodiments are shown in FIGS. 3 and 4. Here, the concave-convex portion 5 is formed into a concave shape, and a slot 6 is formed to communicate the concave-concave concave-convex portion 5 and the inside of the bottle. This removal groove 6 is used when the cap body 2 is assembled.
When the liner 4 enters into the uneven portion 5, the air in the uneven portion 5 is released, and the liner 4 and the uneven portion 5 are surely brought into close contact. or.

This drainage groove 6 also serves as a passage for the liquid content that has entered the uneven portion 5 to return to the inside of the bottle.

In this embodiment, four grooves 6 are formed, but the number is not particularly limited.

Furthermore, the present invention is not limited to assembling a pull-top type cap and a weir body, but can also be effectively implemented in a roll-on type assembling a cap and a weir body that are screwed together.

〔Effect of the invention〕

As described above, the present invention is a product in which contents are filled at high temperature or subjected to heat treatment after filling, in which a cap body 2 having a liner 4 on the inner surface is assembled to a bottle mouthpiece 1 having an uneven portion 5 formed on the upper end surface. As a result, the liner 4 is tightly assembled with the concavo-convex portion 5 due to the displacement generated when it is heated and cooled, and the displacement itself is minimized by the concavo-convex portion 5. The tight assembly state between the liner 4 and the spout 1 can be maintained almost as it is, and therefore excellent effects such as high airtightness are exhibited.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing one embodiment, Fig. 2 is a partial sectional view showing another embodiment, Fig. 3 is a partial sectional view showing still another embodiment, and Fig. 4 is the bottle. FIG. 5 is a plan view showing the mouthpiece, and a partial sectional view showing the prior art. Explanation of symbols 1: mouthpiece, 2: cap body, 3: main body. 4 Niliner, 5: Uneven part, 6: Extraction groove. 1-One Piece Dealer 2--Ikkyu E I Day Book 3--4 books in one 4--Raigu 5-One uneven? Pe-
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Claims (4)

[Claims] (1) The bottle mouthpiece (1) and the liner (4) assembled to the bottle mouthpiece (1) and provided on the inner surface of the main body (3) are deformed, causing the bottle mouthpiece (1) to deform. a cap body (2) that is in close contact with the end face, and a cap that is provided around the upper end face of the bottle mouthpiece (1) with an uneven portion (5) that is in close contact with the liner (4). Assembling structure with the bottle and mouthpiece. (2) The bottle mouthpiece (1) and the liner (4) assembled to the bottle mouthpiece (1) and provided on the inner surface of the main body (3) are deformed, causing the bottle mouthpiece (1) to deform. a cap body (2) that is in close contact with the end surface, and a groove-shaped uneven portion (5) that is in close contact with the liner (4) is provided around the upper end surface of the bottle neck (1); At the same time,
An assembly structure of a cap and a bottle mouthpiece formed by forming a withdrawal groove (6) that communicates the uneven portion (5) with the inside of the bottle. (3) Both circumferential surfaces forming the uneven portion (5) are formed by vertical surfaces (8) along the bottle axis direction.
An assembled structure of the cap and bottle mouthpiece according to item 1 or 2. (4) The cap according to claim 1, 2 or 3, wherein the cap body body (3) is made of aluminum and a press deformation part (7) is formed at the upper end of the outer periphery. Assembled structure with bottle and mouthpiece.