JP2532721Y2 - Glass bottle mouth for roll-on cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION This invention relates to a glass bottle opening for a container cap which is covered with a container opening and hermetically seals the container, particularly alcoholic beverages such as Western liquor, wine, sake, shochu, soft drinks and juices. The present invention relates to improvement of a glass bottle mouth using a roll-on cap used for foods such as beverages, medicines, seasonings and the like.

The roll-on cap referred to here is a pill-proof cap, which is usually abbreviated as a PP cap, or a cap such as a stell cap, which is made of a plastic material corresponding to the screw shape of the bottle mouth at the time of closure with a sealing machine thread roller. A cap that is processed and wound and sealed (hereinafter referred to as a PP cap).

Conventional technology Conventionally, PP caps have
It is clear that the cap has been opened once, and it is pill-proof (PP property) called anti-theft that guarantees the safety of the contents, and easy-open property (EO property) that does not require special opening tools such as bottle openers. In addition to having a cap function such as resealability that can reseal and seal the container with the contents remaining after opening, instead of cork stoppers, screw caps, etc., containers for alcoholic beverages, beverages, pharmaceuticals, foods, etc. It has been widely used as a stopper.

The development is required by Alcoa, Inc. in the United States and Metal Closures, Inc. in the United Kingdom. Based on the design technology of these two major manufacturers, there are glass bottle opening dimensions corresponding to various PP cap sizes. A bottle opening standard is set by the Japan Bottle Manufacturers Association and is widely used in general.

Problems to be solved by the invention In general, the cap of the PP cap is covered with a cap on the bottle mouth with a male screw, and while pressing the upper part, it is wound with a thread roller along the bottle mouth screw shape to form a screw part. At the same time, the cap hem is wrapped around the bottle mouth skirt portion by the skirt roller so as to have a sealing property.

One of the features of the PP cap is that, basically, as described above, the upper pressure and side pressure conditions are appropriately selected and the cap is formed along the screw shape of the bottle mouth so as to have an opening torque suitable for opening. It forms a thread, does not impair its EO properties, and its PP properties are restored to the original state again if the bridge of the sewing machine (Perforation) provided on the PP cap is cut off and sealed. Failure to do so is guaranteed.

However, unlike other caps, sometimes, upon opening, the cap opens the bottle mouth thread in the opening direction (upward).
When trying to start moving, the bridge does not break, the cap screw deforms and the screw thread becomes shallow and idle, and on the other hand, the cap hem is caught in the bottle mouth skirt, so the cap is Troubles such as not being able to open the cap due to idling, or turning the cap screw thread in the opposite direction due to misunderstanding even though the opening direction is indicated by an arrow, resulting in cap idling. May occur accidentally.

As measures to solve this problem, check the shape of the bottle mouth screw, operating conditions of the sealing machine, thread roller abnormalities, etc., change the shape so that the thread roller tip contacts the bottle mouth screw more closely, or We have changed the pressure conditions during sealing, or studied various cap factors such as cap material and coating film, but we have not solved the cause of the trouble, and we still see accidental idling. It is the current situation.

Means for Solving the Problems Accordingly, the present inventors set the phenomenon that the cap cannot rotate and cannot be opened due to idling, and when the molded cap screw causing the opening starts to rotate in the opening direction, the strength to withstand deformation. Is weaker than the bridge strength of the cap (idle),
Also, when the screw thread is forcibly turned in the closing direction and the screw thread breaks (reverse rotation), it is regarded as a phenomenon that occurs, and it is considered that idle rotation due to reverse rotation is not negligible. To prevent idling and reverse rotation, idle torque> second torque reverse torque> person We have been studying ways to increase the screw strength to satisfy the relationship of the torque that can be applied to the cap. (Terms are defined as follows.) 1st torque: torque at the start of rotation when opening (kg-cm) 2nd torque: torque at the time when the bridge starts to break immediately after the 1st torque is generated (Kg-cm) Idling torque: Torque when idling when turned in the correct opening direction (kg-cm) Reverse torque: Torque when idling by rotating in the opposite direction (kg-cm) Reverse torque: Open once Torque when the stopper is rotated in the opposite direction and idle (kg-cm) In the actual evaluation, the idling torque cannot be measured because the bridge breaks. Further, when the reverse torque is measured, the first and second torques cannot be measured. Then, after measuring the first torque and the second torque as substitute characteristics, if the reverse torque of the same cap can be used, the data becomes the corresponding data, which is effective for analysis. Then, when these relationships were examined, it was found that reverse torque ≒ reverse rotation torque ≒ idling torque.

The factors affecting the reverse torque are many and complicated, but when simplified, they are schematically represented by the following equations.

T _R = RW ｛tan (ρ + θ) + μ｝ / tanα T _R = reverse torque (kg-cm) R = radius to bottle thread (cm) W = force to push cap screw thread (kg) ρ = bottle Friction angle with cap ρ = μ / cosα θ = Lead angle of screw (deg) μ = Coefficient of static friction between liner and cap α = Angle (contact angle) between tangent and horizontal at screw contact angle (deg) (deg) ( The length of the screw is treated as the same.) The following can be pointed out from the formula of the reverse torque.

◇ reverse torque T _R is proportional R, the W.

◇ The larger θ is, but also increases the reverse torque T _R, is small influence can not be too large.

◇ [rho, but also increases the reverse torque T _R A larger mu, cracking occurs in draw forming of the cap.

◇ counter torque T _R with respect tanα is inversely proportional.

As described above, the present inventors have confirmed by the reverse torque measurement that reverse torque ≒ reverse rotation torque ≒ idling torque, and the reduction of the idling torque causing the idling (reduction of the reverse torque as a substitute characteristic) ) Was analyzed.

 Table 1 summarizes the main factors.

On the other hand, from the reverse torque formula, the contact angle α that contributes to increasing the reverse torque is the point of interest. That is, if tanα can be reduced, the reverse torque can be set to be large.

A small tan α means that the cap screw needs to be formed deeply.

To form the cap screw deeply, it can be realized by making the tip R of the thread roller of the sealing machine into a smaller R shape, but there is a problem that the cap thread breaks (breaks). Making it smaller is not an effective measure.

That is, it is necessary to form the cap screw deep without making the thread roller tip R small.

In consideration of the above points, the present invention presupposes that sealing can be performed in the same manner as before without changing the conventional cap standard, out of the bottle mouth standard, skirt height, screw thread diameter,
It is designed to effectively prevent idling and reversing by restricting the thread cutting height (height of the screw upper end), the skirt diameter, etc. The main point is that it corresponds to the size of the roll-on cap. Among the various standard values of the bottle mouth standard that have been set, the screw pitch of the screw portion of the bottle mouth is made larger than the standard value and the screw root diameter is made smaller, so that the screw groove is made deeper. The object of the present invention is to make the height of the peak smaller, and as a result, to reduce the contact angle in the screwed state between the cap screw formed by the sealing machine thread roller and the bottle screw.

Speaking of the bottle mouth screw shape, the thread height is relatively increased by reducing the screw root diameter, but to increase the pitch and to avoid threading of the formed cap screw, The thread R is preferably set to be equal to or slightly larger than the distance between the outermost end and the innermost end of the cap screw.

Action Since the thread root diameter is reduced, the thread height is higher than that of the bottle mouth standard even when the screw thread diameter is the same as the bottle mouth standard.

Therefore, when a cap screw is formed by a sealing machine thread roller, the screw pitch is increased and the screw thread height is increased. It penetrates deep into the groove, that is, the contact angle between the bottle mouth screw and the cap screw is reduced, the cap screw groove is deepened, and the strength of the cap screw is increased.

In other words, in the reverse torque model equation shown above, although there are certain restrictions in the specification of T _R = RW ｛tan (ρ + θ) + μ｝ / tanα, as θ increases, the reverse torque increases, Tan in inverse proportion
Since α decreases, the reverse torque increases, and the increase in the idling / reverse torque due to the relationship of idling torque ≒ reverse torque 転 reverse torque increases the cap screw strength.

Example The PP cap is given its name by its diameter and height, and the following are examples of the diameter.

18, 22, 25, 28, 30, 31.5, 36, 38, 42, 46 ... (units)
mm) Names by height include shallow (shallow: S), standard (standard: STD), deep (deep: D), special deep (special deep: SD), extra deep (extra deep: ED), etc. The combination of diameter and height is commonly referred to as, for example, a 30SDPP cap, a 30EDPP cap, a 28 steal cap, and the like.

The bottle mouth mouth type standard corresponding to each cap standard is set, and in order to achieve proper sealing, in the sealing machine, not only the pressure setting at the time of winding tightening, but also the thread roller tip corresponding to the bottle mouth thread The R shape is appropriately selected.

Hereinafter, with reference to the drawings, a part related to sealing will be described in a corresponding bottle mouth-mouth type standard taking PP cap designation 30SD as an example.

 In the drawings, FIG. 1 is a diagram of an improved mouth opening portion of the present invention. FIG. 2 is a schematic diagram showing a sealing situation. FIG. 3 is an enlarged view of a main part according to the present invention. It is a principal part enlarged view.

In FIG. ₁ , the thread diameter φ 1 of the screw 2 (bottle screw) of the bottle mouth ₁ is 28.3 mm, the screw root diameter φ ₂ is 25.9 mm, and the screw thread R ₁ is
1.1, Nejitani R ₂ is 0.6, threaded portion height H ₁ is 10.2 mm, thread pitch P is 3.63, the lead angle θ is 2 ° 26 ', the skirt height H ₂ is 28.0 mm, the skirt diameter phi ₃ is 28.95mm , threaded upper end height (start threading) H ₃ are formed on 1.6 mm.

Without changing the cap standard, the conventional sealing (sealability,
To increase the strength of the cap screw while maintaining the opening torque) conditions, thread diameter, screw top height, skirt height,
The skirt diameter is the same as the conventional standard, thread R ₁ 1.05,
The thread height is set high, with the thread valley R ₂ 0.5 being 1.1 and 0.6, respectively. 1.2mm In this case, since there is a restriction that crest diameter is not changed, the relative thread height H ₄ 1.1 by the screw root diameter smaller (i.e. smaller extraoral diameter)
And In addition, the conventional thread height is 8.5 to 10.5 mm
And the screw pitch is set to 3.18 to 3.63, and the bottle mouth screw lead angle (bottle screw inclination) 2 ° 26 ′ is set to match the lead angle 2 ° 30 ′ of the thread tightening thread roller. The height of the skirt is made the same as that of the conventional standard by changing the height of the screw portion from the height of the screw portion to the height of the skirt by absorbing the shape including the annual group (recess).

FIG. 2 schematically shows the sealing state. The bottle opening 1 is covered with a PP cap 4 via a packing material 3, and the pressure block 5 presses the cap 4 at a constant pressure. A thread is formed in the cap 4 while lowering the thread roller 6 at the tip R0.9 along the screw of the bottle mouth while making the material 3 bite into the bottle mouth.

On the other hand, the skirt roller 7 moves horizontally along the bottle-mouth skirt, and rolls the skirt of the cap 4.

The cap screw formed as described above has a cap plate thickness T0.24 mm, a roller tip R0.9, and a bottle mouth screw pitch of 3.63. Therefore, as shown in FIG. The distance D between the groove and the cap screw valley is 0.27.

Therefore, the conventional standard bottle mouth screw pitch shown in FIG.
As is clear from comparison with the spacing of 0.32 in the sealing situation of 18, the thread is high and the thread of the cap enters the deep part of the thread, so the contact angle α between the cap screw and the bottle mouth thread is As a result, the screw strength of the cap with respect to the bottle mouth portion is increased, and the reverse torque of the cap and, consequently, the idling torque are increased, so that idling of the cap and the like can be prevented.

The opening torque was also as shown in Table 2 below.

In the improved type, the reverse torque was able to be increased while maintaining the second torque (torque at which the bridge begins to break) at the time of opening at a conventional level. That is, the strength of the cap screw can be increased, and the cause of the idling can be eliminated.

When the reverse torque of the opening torque is calculated by applying it to the model formula, the improvement is about 30%. However, the improvement of the measured reverse torque shown in Table 2 is about 15%. This is a factor that is not taken into account, a variation factor for the contact angle α, such as a change in slip due to damage to the cap paint at the time of sealing, a change in contact angle due to springback due to cap packing elasticity, a state of leakage of the bottle mouth, a bottle screw. This is because the clearance between the peak and the inner diameter of the cap has an effect.

However, there is no doubt that the result of the increase in the reverse torque intended in the present invention is that the screw strength can be increased to provide a countermeasure against idling.

Next, Table 3 collectively describes the case of 31.5, 36, and 30 steles including the above-mentioned Example 30SD with respect to the setting of the bottle mouth standard of another cap size.

For opening torque, the same result as 30SD was obtained.
In the cap screw shape, the number of effective screw turns can be increased.
The set value was approximately similar to the lead angle of 2 ° 30 ′.

Effect of the Invention As described above, the cap screw formed by the improved bottle mouth screw portion having the structure of the present invention and the thread roller tip R shape appropriately selected according to the cap size at the time of sealing is the roller tip R. Without reducing the thread size, the problem of thread breakage does not occur, and the contact angle with the bottle mouth thread can be reduced, that is, a deeper thread groove can be obtained, and the strength of the cap screw can be increased and the screw can have a higher idling torque. Therefore, when opening the cap, deformation such that the cap screw thread becomes shallow can be prevented, and the reverse rotation torque also decreases.
It can be higher than the conventional level and higher than the opening torque, and idling and reverse rotation can be prevented.

Furthermore, the large screw pitch and the adjustment of the lead angle (thread inclination) to the lead angle 2 ° 30 'of the thread roller of the sealing machine facilitates the setting of sealing conditions and increases the degree of freedom in preparation for variations in bottle specifications. There is also an effect that can be done, and by increasing the screw height in the bottle mouth standard, the bottle mouth screw thread length becomes longer,
The effective number of turns of the cap screw can be increased,
The deep thread groove shape also has the effect of reducing the deformation of the screw thread due to the change in the contact angle due to the spring back due to the cap packing, etc., and ensuring a stable set opening torque with little variation.

[Brief description of the drawings]

FIG. 1 is a side view of a bottle mouth improved mouth mold according to the present invention, FIG. 2 is a schematic view showing a sealing state, FIG. 3 is an enlarged view of a main part according to the present invention, and FIG. It is an enlarged view. 1 ... bottle mouth part, 2 ... bottle mouth screw, 4 ... cap, 6 ...
... thread rollers.

Claims (1)

(57) [Scope of request for utility model registration] 1. A glass bottle mouth for a roll-on cap in which a thread cap is formed along a bottle mouth screw shape using a sealing machine thread roller and a standard cap is put on the bottle mouth screw portion, and the roll-on cap size standard is satisfied. The screw pitch of the screw portion of the bottle mouth portion was made larger than the standard value among the various standard values of the bottle mouth portion standard set in advance, and the screw groove was made deeper by reducing the screw root diameter. A glass bottle mouth for a roll-on cap, wherein a thread height is formed, and as a result, a contact angle in a screwed state between a cap screw formed by a sealing machine thread roller and a bottle mouth screw is reduced.