DE1205860B - Closing cap made of flexible plastic - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B 67b

German class: 64 a - 20/01

Number: 1205 860

File number: F 29390 HI / 64 a

Filing date: September 15, 1959

Opening day: November 25, 1965

The invention relates to a closure cap with a bead made of elastically flexible plastic for Bottles and similar vessels which have a convex mouth bulge and in which high internal pressures can arise.

Such. Vessels are so far generally by means of corks or metal closures, eg. B. Crown cork closures, been locked.

It is known that vessels of the type mentioned, in which no internal pressures arise, by means of plastic caps that can be easily removed and just as easily reapplied.

Such closure caps normally consist of a cap base, a shell part and a bead part with an inwardly directed retaining bead which is located under the vessel mouth bead engages. The tightness of such caps is usually either only by means of the tight on Vessel neck adjacent retaining bead achieved or that the retaining bead through the shell part Pulls the bottom of the cap against the edge of the vessel mouth.

However, such a closure cap cannot be used if high internal pressures arise in the vessel. Since plastic is flexible, the bottom of the cap bulges due to the internal pressure at the top, which eliminates the need for sealing at the front. The radial pressure between the retaining bead and the neck of the vessel is also kept relatively small, so that the retaining bead under elastic expansion of the bead part can be slipped over the vessel mouth bead relatively easily.

In order to eliminate the disturbing influence of unevenness, it has already been proposed that Inner surface of the cap with annular, thin sealing ribs to rest against the end face to provide the vessel mouth and / or the vessel mouth bulge. But this shape is coming only possible with low internal pressures, since the ribs have a distance between the inner surface of the cap of the outer surface of the vessel mouth, so that a higher internal pressure in the vessel increases the sealing pressure which must reduce or even cancel the ribs.

Furthermore, a plastic cap has been proposed which has a jacket part standing at an angle to the cap base, which has a constant wall thickness over its entire length and whose shape is adapted to the lower end of the convex shape of the vessel mouth bead. Such a closure cap, the cavity of which can be selected to be somewhat narrower than the outer jacket of the vessel mouth bead, is made of an elastically flexible material when the closure cap is pressed
plastic

Applicant:

F. G. M. & Co., Copenhagen

Representative:

Dipl.-Ing. F. Eideneier, patent attorney,

Stuttgart O, Neckarstr. 50

Named as inventor:

Erik Fuglsang-Madsen,

Sven-Egon Stocklund, Rungsted-Kyst

(Denmark)

Claimed priority:

Denmark of September 16, 1958 (3346),
of April 25, 1959 (1483),
dated May 25, 1959 (1840)

The bottom of the cap is slipped on from above over the bulge of the vessel mouth until one is on the underside of the cap bottom arranged annular rib comes to rest on the edge of the vessel mouth. During this closing process, the cap is forced to compress or shorten Shell part. This prevents it from sticking tightly to the bottle mouth bead, especially the jacket part after the shortening by upsetting, even when the elasticity of the molding material is sluggish, strives later to assume the original greater axial length again. In doing so, the The axial sealing pressure at the top in the edge area of the cap base is reduced. If there is no internal pressure in the vessel is present, the tensile stresses in the cap may be sufficient to prevent said Rib close enough to pull against the edge of the vessel mouth. Meanwhile, internal vascular pressures cause one Arching of the cap base and a lifting of the circumferential rib from the seal endangering Rim of the vessel mouth. In this case, even the relatively thin jacket part cannot counter the internal pressure with the cap hold onto the vessel.

Although it has already been proposed many times to use plastic caps instead of the previous metal caps

509 739/42

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pen to use, and indeed as a closure due to the special shape of the after for vessels in which excess pressures can be applied at the bottom of the vessel mouth bulge, has not yet succeeded in a one-piece fenden edge bead. Essential for this shape cap to create that is able to with high environment that the height of the edge bead is greater than Internal pressure both tightness and the required 5 its thickness. This will make the lower section such a firm fit on the edge of the vessel mouth to the edge bead of the axially directed tension ensure, forces practically not burdened, so that he is free from

In order to use the other tensions only radially inwards despite the existing difficulties forces generated by plastic caps for vessels, which correspond to those in the upper area possible, in which internal pressures can arise, counteract external bending influences, Although it has already been proposed, such the support bead allows the cap on the Apply plastic caps with a clamping ring made of hard vessel lining by pressing with a to provide elastic material, the ring tool corresponding to the diameter from above is pushed with bias over the cap, the upper annular surface of the support bead presses. Even around the bead part with its inner wall sealing 15 here acts the great height of the edge bead one below the largest diameter of the vessel - undesirable outward bending of the edge bead transverse mouth bead to press. Such a waste under the effect of the considerable closing cap but is particularly expensive in opposition to this.

the production, because it consists of two parts of a large company, z. B. a brewery, can

divider-like materials. On top of that, 20 do not avoid having a larger number

such closure caps often not tight enough. Bottles relatively coarse casting fins or

The purpose of the invention is to have a closure cap that has a seal by application which can be made in one piece a cap made of a single piece and at the same time is able to aggravate both a good. In such a case one could seal as well as a tight fit even at very 25 remember to ensure the caps with a coat-high internal pressure, z. B. to be provided with so part lining gasket that high pressures, as they would have to be in beer bottles during the relatively thick and soft material, Pasteurization occur and which 10 atm or that they absorb all the increases in themselves and can be more. could penetrate into the deepest depressions. One

According to the invention, this is achieved in that 30 such sealing insert has, however, been used for the inven-

which has proven to be unsuitable for tightly enclosing the vessel mouth; because

beaded certain, rounded at the top of the jacket part which causes the inside of the bottle when there is overpressure

Cap in a known manner in diameter upward train in the shell part that the

and height is kept smaller than the vessel outer layer of the relatively thick insert facing

mouth bead, but such that when applied 35 shifts over its inner layer. Because the

the cap its jacket part also in the axial direction jacket part and the top layer of the retaining bead

is stretched and that the height of the known slip can just be a particularly thick

Put the cap on the bottle neck with an outwardly directed support bead measured bead part

provided edge bead is greater than its thickness. not to record the duration.

It is thereby achieved that the jacket part, if 40. According to the invention, however, it is itself at the cap is placed on the vessel, in two bottles and similar vessels with strongly protruding one on the other vertical directions and thus in stepping pouring fins, coarse nicks or the like Directions is stretched so that it lent against the complete tightness even with high vessels to achieve convex vessel mouth bulge tightly and with internal pressure, without the tight fit of the great force is pressed. The high 45 cap on the bottle neck created in this way, and Sealing pressure acts evenly in the area of the fact that the inside of the shell part wide zone of the vascular opening bulge. As a result, with a thin lining made of one material small unevennesses are provided on the surface of the vessel, which is more flexible than the bulge of the cap vessel opening meaningless, the immaterial being.

evenness from projections or depressions - 5 ° Such a covering membrane is in itself too thin, can stand. At the same time, as a result of the all-round, the required tightness is created; in the frame Stretching of the shell part effectively prevents the invention from achieving the required tightness Gases or liquids under pressure interact with the plastic material between them Vessel mouth bead and jacket part a way bah cap reached. The cap material itself can As it would be possible if the jacket 55 cling to any projections itself part would only be stretched in one direction. To bridge the and hollows or because it's in all To generate sealing pressure and a secure tightness is stretched, also penetrate into such directions, hold the cap on the bulge of the vessel mouth ensure, do not have to lay tightly around sharp edges in the shell part of the cap axial surface Tensile forces are effective that are greater than the 60 or can penetrate into sharp corners. Step here due to the (maximum occurring in the vessel) but the membrane added when the Internal pressure in the shell part generated tensile forces. The cap on the vessel is in the spaces in between for the sealing and holding required tensile between the inside of the shell part and the Forces are initially created when the cap is placed on corners or edges of projections or vertices applied so that the jacket part pushes in or fills them up when they are raised. Through this putting pressure on the cap will make the required tightness even then slight Surface of the support bead secures accordingly when the thickness of the membrane is less is stretched. The rec- as the height of the projections or the depth of the

hollow spots on the surface of the sealant Muzzle bulges occur.

It is advantageous to choose the wall thickness of the shell part less than the thickness of the cap base that point that is intended to rest on the edge of the vessel mouth, and ensures that the The thickness of the cap base gradually decreases towards the shell part. This ensures that when you put on the cap mainly the material of the shell part is stretched, while at most in a small amount of material is drawn from the cap base into the shell part, which is unfavorable in this respect would be because it would reduce the desired stretching of the shell part.

The subject matter of the invention is illustrated in the drawings using a few exemplary embodiments. It shows

Fig. 1 on a very large scale a half Cross section through an embodiment of the closure cap,

F i g. 2 on the same scale as in FIG. 1 after application to a corresponding cap Bottle neck,

3 and 4, on the same scale, cross-sections through two other exemplary embodiments of the closure cap.

The in F i g. 1, shown in a large enlargement and denoted in its entirety by 40, consists of a cap base 10 which merges through a curved transition part 12 into an almost cylindrical casing part 14. The jacket part 14 continues in an edge bead 16 which has a retaining bead 18 within the diameter of the jacket part 14 and a support bead 20 outside it. The edge bead 16 has an elongated cross section. Its greatest height L is about 30% greater than its thickness b.

The cap is intended to be attached to a bottle neck 22 similar to that shown in FIG. 2 shown commercial standard type. The bottle neck has a convex mouth bead 24 and at the top including an annular groove 26. The transition 28 between the lower outer edge of the mouth bead 24 and the upper part of the annular groove 26 is relatively sharp-edged. The outer surface of the mouth bead 24 is in the form of an arc of a circle when viewed in cross section. The center 30 of the circle is higher as the transition 28.

The standard diameter of the respective bottle type is designated by D. The cap shell part

14 has an inner diameter d which is 6% smaller than D in the embodiment shown. In practice, d is chosen to be at least 5% smaller than D, although it may be sufficient if d is only about 3% smaller than D.

Apart from the central part of the cap base 10, the cap base 10 has a thickness T which

15 to 20% greater than the thickness t of the wall of the casing part 14. The transition curvature 12 results in a gradual decrease in wall thickness between the cap base 10 and the shell part 14. The decrease in wall thickness begins at the point 34 where - with reference to FIG .

If according to FIG. 2 the cap is placed on the bottle neck, the jacket part 14 will wrap around the mouth bead 24 and enclose it tightly over its entire height. The retaining bead 18 is placed in the bottle neck ring groove 26 and, because d is smaller than D , it pulls the lower part of the casing part 14 close to the transition 28. As a result, the jacket part 14 is stretched in its circumferential direction.

In addition, because the distance h between the underside of the cap base 10 and the lower edge of the casing part 14 is smaller than the corresponding distance H between the top 36 of the bottle neck and the transition 28, the casing part 14 is also stretched in the axial direction.

This stretching of the jacket part 14 is shown in FIG. 2, where the cap is shown placed on the bottle neck with solid lines, while the original shape of the cap, as shown in FIG. 1 is shown in Fig. 2 is indicated by dashed lines. On the inside of the cap, shown in dashed lines, three points /, α and c are indicated, of which / the transition between the jacket part 14 and the transition part 12, c is the very inner point of the upper side of the retaining bead 18, and α is the very outer point correspond at the transition to the shell part 14. The corresponding points a, c ' and f are indicated on the cap shown with full lines.

From Fig. 2 it can also be seen that - because the thickness T of the base 10 is greater than the thickness Z of the casing part 14 - it is practically only the casing part that is stretched. Furthermore, it can be clearly seen how the lower area of the edge bead is drawn together inwards and how this contraction strongly supports the holding effect of the holding bead 18.

In the embodiment shown in Fig. 1, the tightness achieved depends on the cap material itself is sufficiently flexible to cope with smaller nicks or protrusions on the outside to be able to snuggle up to the bead of the bottle neck. But if you have a material for the cap used, which is less resilient or if on the outside of the mouth bead of the bottle If relatively large nicks or protrusions occur, the required tightness can be achieved in a simple manner Secure way in that the cap is provided with a lining membrane, its material is softer than the material from which the cap itself is made. This will be the lining attached so that its inner wall forms at least a part of the inside of the shell part 14.

Two embodiments of caps with such covering membranes are shown in FIGS. The caps 40 themselves are designed in the same way as those shown in FIG. 1 Cap. Meanwhile, is located on the inner wall of the shell part 14 and the adjacent portion of the Cap bottom 10 and on the top of the retaining bead 18 a skin 74 from relatively soft material, e.g. B. latex.

Such a lining membrane 74, although it is very thin, offers the security that the cap will also then holds perfectly tight when there are high internal pressures in the bottle, e.g. B. Press up 15 atü, and if, in addition, the outside of the mouth bead 14 has projections (e.g. the always occurring pouring fins) or shows depressions (e.g. smaller notches that are significantly higher or

are deeper than the maximum thickness of the membrane 74). This effect of the thin lining membrane is based apparently on an interaction with the cap material, which is also flexible.

In order to ensure good adhesion of the pellicle 74 to the inner wall of the cap, the inner wall is 76 of the jacket part 14 in the case of the FIG. 4 provided with a roughening 76.

In addition, in the embodiment according to FIG. 4, there is also an underside of the top plate 10 downwardly directed annular flange 78 is provided, which forms the inner boundary of the membrane 75. The shoulder 80 of the annular flange 78 is conical in the direction towards the top plate 10. Through this the hold of the membrane 74 in the cap is improved and its slipping out even when it is removed the cap from the bottle neck.

The lining membrane 74 is expediently poured into this using the cap 40 as a mold, preferably by causing the cap 40 to rotate. This is used to form the Cuticle's required amount of material, preferably a small amount of an ammoniacal one Latex solution, introduced into the cap in the liquid state within the retaining bead 18. The material spreads over the inner wall of the casing part 14 under the effect of centrifugal force the end.

As a result, the membrane 74 is given the ideal indicated in FIGS. 3 and 4 in the simplest possible manner Thickness dimensioning in the axial direction of the shell part 14. This is such that the membrane in the Cross-section increases from its lower edge to at least that jacket section which is intended to rest on the largest outer diameter of the mouth bead 24 of the bottle.

This thickness profile can be used to achieve a very thin layer of skin on the upper ring surface of the retaining bead 18, which helps increase the friction on the bottle neck glass, but is so thin that no particle displacements occur inside which would increase the frictional effect wholly or in part could pick up again. At the same time it is achieved that at the section of the mouth bead 24 which has the largest diameter and where the tightness is particularly important, a little more skin material is available. This also the tightness is ensured even in such sharp edges, which can not go beyond to conform closely enough the cap material itself under some circumstances _{like this.}

The invention is not limited to the illustrated embodiments, which only serve as examples, but allows numerous modifications within the scope of the patent claims. It will, however expressly declares that no element protection is sought for individual features of the claims. It rather, only the combination of features should be protected.

Claims (6)

Patent claims: 1. Closure cap with an edge bead made of elastically flexible plastic for bottles and similar vessels which have a convex mouth bead and in which high internal pressures can arise, characterized in that the jacket part (12, 14) intended to seal the vessel mouth bead (24) and rounded at the top ) the cap is kept smaller in diameter and height than the vessel mouth bead in a known manner, in such a way that when the cap is applied, the jacket part is also stretched in the axial direction, and that the height (L) of the in a known manner with a outwardly directed support bead (20) provided edge bead (18) is greater than its thickness Qj) . 2. Closure cap according to claim 1, characterized in that the inside of the jacket part (14) is provided with a thin lining membrane (74) made of a material that is more flexible than the cap material is. 3. Closure cap according to claim 1 or 2, characterized in that the wall thickness (i) of its shell part (14) is less than the thickness (T) of the cap base (10) at that point which is intended to rest against the edge of the vessel mouth, and that the thickness of the cap base (10) gradually decreases towards the casing part (14). 4. Closure cap according to claim 2, characterized in that the lining membrane (74) also over at least that part of the edge bead (18) which is closest to the casing part (14) extends. 5. Closure cap according to claim 4, characterized in that the thickness of the lining skin (74) from its lower edge to at least the point of the shell part (14), which is in the Area of the largest outer diameter of the vessel mouth bead (24) comes to lie, increases. 6. Closure cap according to one of claims 2, 4 or 5, characterized in that the lining membrane (74) is poured into it using the cap as a mold. Considered publications:
German Patent Nos. 882 655, 913 846;
German Auslegeschrift No. 1-Θ27-6867 // ' Cl 5 <, i ζ German utility model No. 1 690 032;
French patent specification No. 1012 848,
1047061. 1 sheet of drawings 509 739/42 11.65 © Bundesdruckerei Berlin