CN1163595A - Plastic closures for crimped bottles - Google Patents

Abstract

A plastic closure for a beaded bottle has a closure cap (3) with a circular, planar cover plate (2), on the underside (4) of which there is an outer ring (5; 5') which surrounds the bottle neck in the closed position and an inner sealing ring (6) which at least partially bears against the inner periphery of the bottle opening as a closure cap, wherein two rings (5, 6) which are arranged approximately coaxially with respect to a central axis (7) are integrally formed on the cover plate (2). The inner sealing ring (6) has a plurality of reinforcing ribs (11) on its inner side (10, 10 ') facing the sealing surface (9; 9 ') and each is designed as a profile (12; 12 ') which at least in regions provides an elastic bearing engagement for the inner sealing ring when the inner sealing ring (6) is in the closed position.

Description

Plastic closures for crimped bottles

The invention relates to a plastic closure for crimped bottles according to the preamble of claim 1 .

Known plastic closures of this form (DE-OS 2104543) have a top piece and a sealing ring that rests against the inner opening edge of the crimp bottle as a seal, the sealing ring itself consisting of a sealing flange and a It consists of a ring-shaped fold coaxial with it. Such plastic closures are expensive due to their high production and assembly costs, and thus their use is limited to a certain extent.

The object of the present invention is to provide a plastic closure for crimped bottles which is inexpensive to produce and which has a sufficient tightness when used for bottle openings with different diameter tolerances.

This object is substantially achieved by the features of claim 1 . Additional features and advantageous configurations are given in the dependent claims 2 to 24 .

According to the invention, the plastic closure for a crimped bottle is provided with a plurality of reinforcing ribs in the area of the sealing cover which abuts against the inner circumference of the bottle mouth, and said reinforcing ribs are connected with the inner sealing ring at its opposite sealing surface from behind. The inner sides overlap and have a configuration parallel to the central axis, so that the inner sealing ring has sufficient stability and flexibility, and a tolerance compensation between the sealing surface and the finish area is obtained.

With this reinforcement rib, the overall thin-walled sealing ring bears the deformation of the sealing cap that occurs due to the press fit, especially when plugging into the mouth of the bottle, so that the sealing performance can be guaranteed sufficiently securely along the entire inner circumference and at the same time avoiding Defective deformation of the upper cover.

The construction of the reinforcing ribs results in a thin-walled inner sealing ring, whereby even when a hard plastic material is used, it can be flexibly adapted to bottle openings of different tolerances and/or shapes. The structurally-integrated sealing ring protruding through the sealing surface has a transition region that tapers towards the cover plate, so that the transfer of material stresses to the cover plate is avoided and a visually pleasing shape is maintained off the top of the plate.

The configuration of the stiffening ribs parallel to the center axis enables a simple ejection when the closure cap is produced in one piece, for example by injection molding. It is also conceivable to arrange the reinforcing ribs in a specific inclined position with respect to the central axis or to provide the reinforcing ribs in an arcuate shape, the technical limitation in each case being whether the product can be removed from the injection mold.

The invention will be described in detail below with the aid of the accompanying drawings, which illustrate several exemplary embodiments of plastic closures constructed according to the invention, in which:

Fig. 1 is the bottom view of the plastic closure of crimp bottle (Wulstrandflasche) that has reinforcing rib in the inner sealing ring area,

Fig. 2 is a partial cutaway side view of the plastic closure according to Fig. 1;

Figures 3 to 5 are detailed drawings similar to Figure 1;

Figure 6 is an inner sealing ring with ribs of different shapes;

Figure 7 is a side view similar to Figure 2, of a second embodiment of a plastic closure with a threaded portion;

Figure 8 is a bottom view of a third embodiment of the plastic closure similar to Figure 1, with a predetermined fracture zone located in the inner sealing ring area;

Fig. 9 is a sectional side view of the plastic closure of Fig. 8;

Figures 10 to 17 are enlarged cross-sectional views of the plastic closure at the intended fracture zone;

Figure 18 is a bottom view of a fourth embodiment of a plastic closure with a threaded portion similar to Figure 7, and

Figure 19 is a cutaway side view of the plastic closure according to Figure 18;

Figure 1 is a plastic closure generally designated 1, which is typically used especially for crimped bottles (not shown) closed by a crown stopper. The plastic closure has a cap 3 ( FIG. 2 ) with a circular planar cover 2 , on the underside 4 of the cover 2 there is an outer ring 5 which encloses the neck of the crimp bottle when closed and an at least partially sealing surface. Lean against the inner sealing ring 6 of bottle opening inner periphery as a sealing strip. The rings 5 and 6 are arranged concentrically with respect to the center line 7 and are preferably integrally formed on the cover plate 2 .

According to the invention, the inner sealing ring 6 of the plastic closure 1 has a plurality of axially parallel reinforcing ribs 11 on its inner side 10 facing the sealing surface 9 . The reinforcing ribs may, if appropriate, be molded parts 12 which are integrally connected to the rear side of the inner sealing ring 6 and to the underside 4 of the cover plate 2 . The inner sealing ring 6 , which engages in the closed position of the sealing cap and the bottle neck support, has several shapings in the reinforcing ribs 11 , whereby the rigidity and elasticity of the material can be influenced locally or point by point.

According to the partially sectioned plastic closure 1 shown in FIG. 2 , the reinforcing rib 11 has a profiled height 13 approximately corresponding to the length of the inner sealing ring 6 in the axial direction, wherein the reinforcing rib 11 has a free end facing the guide at its axial free end. The reduced bearing area 14 thus facilitates the centering of the inner sealing ring 6 when the closure part 1 is pressed into the bottle neck.

The bottom view of FIG. 1 shows overall the structure of the reinforcement rib 11 , wherein the reinforcement ribs each have a common connection 16 in pairs at their free ends facing the center line 7 . An elastic cavity 17 is thus formed between the inner side 10 of the inner sealing ring 6 and the reinforcing rib 11, and the reinforcing rib 11 forms a star-shaped fold in the circumferential direction of the inner sealing ring 6, so that the inner sealing ring 6 will be pressed into the The deformations that occur during entry into the neck of the bottle are distributed evenly over the entire sealing surface 9 and thus result in a secure, airtight closure of the bottle. The star-shaped folded area is integrally connected with both the inner sealing ring 6 and the cover plate 2 .

It can be seen from the description of the other embodiments of the inner sealing ring 6 and the plastic closure in FIGS. A generally V-shaped projecting leg 19 (FIG. 1). In the embodiment of FIG. 3 the reinforcing ribs 11 are legs 19' which are curved and transition into one another and in another variant of FIG. In the variant of FIG. 5 the profiled leg 19 ″ has a radial web 21 and in the embodiment of FIG. 6 is a further development of the embodiment of FIG. 1 , wherein a support ring 20 is provided on the V-shaped leg 19 .

The sectional view of the plastic closure 1 according to FIG. 2 shows the outer shape of the inner sealing ring 6, whose cross-section has a sealing surface 9 with a convex shape and on the other hand its inner side 10 connected to the reinforcing rib 11 is partly a cylinder. Shaped peripheral surface 24. In the upper region of the cylindrical peripheral surface 24 there is an inclined transition zone 25 towards the center line 7 and the raised sealing surface 9 has a constant radius R in a suitable embodiment, which extends into the cover at its transition zone 25 The underside 4 of the plate 2 .

In order to reliably press the inner sealing ring 6 into the neck of the bottle, or wrap the outer ring 5 around the bottle crimp, the bulging sealing surface 9 has a highest (far) point S relative to the center line 7, which is located at a point defined by An upper portion of a clamping plane 27 defined by a crimp portion 26 on the outer ring 5 and enveloping the crimp bottle in the closed position.

In a second embodiment of the plastic closure 1' according to FIG. 7, the inner sealing ring 6' is approximately trapezoidal in cross-section, wherein its transition region 25' inclined to the cover plate 2 has parallel annular surfaces 28,29. In this embodiment the sealing surface 9' and the inner side 10' connected to the reinforcing rib 11 run at least partially parallel. The inner sealing ring 6' is provided on the cover plate 2 having an outer ring 5' with a threaded portion 30, whereby the (cover plate) plastic closure 1' forms the threaded closure of the corresponding bottle neck (not shown).

The flexibility and the deformability of the inner sealing ring 6 in the above-mentioned plastic closures 1, 1' can be realized structurally with little effort in that the reinforcing rib 11 extends on its inner side 10 of the inner sealing ring 6 in the joint region 18 has a wall thickness H which is axially at least partially smaller than the wall thickness H' ( FIGS. 1 , 2 ) between sealing surface 9 and inner side 10 , so that deformations during production of plastic closures 1 , 1 ′ are avoided.

Figures 8 and 18 are respectively bottom views of two further embodiments of plastic closures 101, 101' which each have a notch 141 forming a predetermined breaking zone 140 in the region of their closure cap 103. The sectional views of FIGS. 9 or 19 and the detailed views of the sections of FIGS. 10 to 17 show the predetermined breaking zone 140 with notches 141, 141' of different cross-sectional shapes, in each case forming a Plate 142 with reduced material thickness M. The cross-sectional profile of notch 141,141' can change arbitrarily except that it can be rectangular (Fig. 10 to 11), arched (Fig. 12 and 13), triangular (Fig. 14 and 15), as shown in Fig. Show. The double rectangular recess according to FIG. 17 creates a further cutout 143 in the plate 142, whereby the thickness of the intended breaking zone is further reduced.

It is also conceivable that the recess is an annular groove (not shown) formed in the closure cap 103, which is arranged on the underside 104 of the closure cap 103 similarly to the recess 141 and/or similar to the recess 141' on the bottom side 104 of the closure cap 103 The upper side of the cover 103 is closed.

It can be seen from the sectional view of FIG. 9 or 19 that the notch 141 is arranged between two reinforcing ribs in the folded reinforcing rib under appropriate conditions. It is also conceivable to provide the recess 141 on the underside 104 of the closure cap 101, 101' in an inner region 144 of the inner sealing ring 6, so that the production of the intended breaking zone 140 is particularly simple and easy to control.

Using the above-mentioned predetermined breaking zone 140, the plastic closure, which can be inserted on crimped bottles in particular according to the crown plug principle, has a material shape which can be formed together with little effort during its integral production, for example by injection moulding. When using the plastic closure 101, 101', for example on a bottle with a carbonated content, the predetermined breaking zone 140 acts as a safety valve, whereby the bottle has a breaking protection function.

As a result, especially when the plastic closures 101, 101' are formed from high-strength plastics, since their connection zone can be fixed by the star-shaped folded leg and the curled part 26 on the inner sealing ring 6 even at temperatures up to, for example, 25 The sealed support engagement is also maintained at high pressures of bar, thereby reducing the hazard due to the presence of the intended fracture zone 140 even when using bottles made of explosive materials such as glass. This can be by designing the corresponding size of the predetermined fracture zone 140, such as the material thickness of the plate 142 zone, to form a structure of plastic closures 101, 101' matched with different allowable internal pressures.

In a suitable embodiment the aforementioned plastic closures 1, 1'; 101, 101' may be made of polypropylene (PP), or polyethylene (PE, HDPE), wherein the closures are at least at an ambient temperature of 10°C to 60°C It has a reliable sealing performance at the sealing position when the internal pressure reaches 25 bar and above.

In addition, it can also be seen in the cross-sectional view of FIG. 9 or 19 that the inner sealing ring 106 has a shape that is set back relative to the clamping plane 127 of the crimped portion 126 ( FIG. 9 ) or the clamping portion of the threaded portion 130 ( FIG. 19 ). The length 113 thus, in addition to saving material when producing the closure, in particular also optimizes the force required when pressing the plastic closure into a crimped bottle (not shown). When pressing in ( FIG. 9 , arrow 145 ), the crimped bottle is gripped by the crimped portion 126 in the first closing stage and the sealing ring 6 is then brought into the connected position in the second stage. Overall, only low forces act on the plastic closure, so that no damage occurs and thus a secure sealing connection results.

In a suitable embodiment the plastic closure 1, 101 has a deformable edge-like ring 146 in its outer ring 5 region when the plastic closure 1, 101 is removed from the bottle, whereby by its permanent deformation a small An indication of a sufficiently secure opening or an indication that the plastic closure 1, 101 is not damaged can be achieved at a low cost.

Claims (24)

1. the plastics closure of crimping bottle has a seal bootr (3) of being with circular flat cover plate (2), is provided with an outer shroud (5 that encases bottleneck at detent position at its downside (4); 5 ') and a local at least inner seal ring (6) that abuts in Zhou Zuowei seal closure in bottle opening, wherein two roughly with respect to the ring (5 of the coaxial setting of central axis (7), 6) integrally formed on cover plate (2), it is characterized in that: inner seal ring (6) faces toward sealing surface (9 at it; 9 ') inboard (10,10 ') have a plurality of strengthening ribs (11) that are roughly parallel to axis (7), and described strengthening rib is designed to respectively when inner seal ring (6) local at least drip molding (12 that the elastic support combination is provided for inner seal ring when being positioned at detent position; 12 '; 12 "; 12 " '; 12 " ").

2. by the described plastics closure of claim 1, it is characterized in that downside (4) one of the inboard (10,10 ') of strengthening rib (11) and inner seal ring (6,6 ') and/or cover plate (2) links to each other.

3. by claim 1 or 2 described plastics closure, it is characterized in that strengthening rib (11) has one axially roughly corresponding to the moulding length (13) of inner seal ring (6,6 ') length.

4. by one of claim 1 to 3 described plastics closure, it is characterized in that strengthening rib (11) has one towards the most advanced and sophisticated supporting area (14) that shrinks of a guiding at its axial free end.

5. by one of claim 1 to 4 described plastics closure, it is characterized in that at least two strengthening ribs (11) have a shared bonding pad (16) at the free end of its subtend central axis (7) in each case.

6. by one of claim 1 to 5 described plastics closure, it is characterized in that, between inner seal ring inboard of (6,6 ') (10,10 ') and strengthening rib (11), form an elastic cavity (17 separately at least; 17 ').

7. by one of claim 1 to 6 described plastics closure, it is characterized in that strengthening rib (11) is disposed at inner seal ring (6 with a star flatung shape; 6 ') on.

8. by the described plastics closure of claim 7, it is characterized in that described star flatung shape strengthening rib had cut shape both and inner seal ring (6; 6 ') the continuous back-shaped shape in footpath that links to each other with cover plate (2) one again and form a closure of one.

9. by the described plastics closure of one of claim 1 to 8, it is characterized in that strengthening rib (11) is from inner seal ring (6; 6 ') setting out in the land (18) on the inboard (10,10 '), roughly forms the shaping supporting leg (19) of V-arrangement projection.

10. by one of claim 1 to 9 described plastics closure, it is characterized in that strengthening rib (11) is a curvilinear figure mutual transition bonded assembly shaping supporting leg (19 ').

11., it is characterized in that strengthening rib (11) (7) outstanding end passes through a shared carrier ring (20 at it towards the axis by one of claim 1 to 10 described plastics closure; 20 ') link to each other.

12., it is characterized in that inner seal ring (6 by one of claim 1 to 11 described plastics closure; 6 ') cross-sectional plane has a sealing surface of heaving on the one hand, on the other hand, the inboard (10) that links to each other with strengthening rib (11) is a cylindrical surface (24), and it has one and tilts and towards the transition region (25 of the downside (4) of cover plate (2) towards central axis (7); 25 ').

13., it is characterized in that the sealing surface of heaving (9) has a constant radius (R) in cross-sectional plane by the described plastics closure of claim 12.

14. by claim 12 or 13 described plastics closure, it is characterized in that, the sealing surface of heaving (9) has a vertex with respect to central axis (7) (S), and it is arranged on one and goes up and encase the top, clamping plane (27) that the crimping portion (26) of crimping bottle is limited in make position at outer shroud (5) by one.

15., it is characterized in that inner seal ring (6 by one of claim 1 to 11 described plastics closure; 6 ') cross-sectional plane is that a roughly trapezoidal profile and its have parallel anchor ring (28,29) towards cover plate (2) bevelled transition regions (25 ').

16., it is characterized in that sealing surface (9 ') extends in parallel the part at least with the inboard (10 ') that links to each other with strengthening rib (11) by the described plastics closure of claim 15.

17., it is characterized in that strengthening rib (11) has a wall thickness (H) in the inboard land (18) that is located at separately by the described plastics closure of claim 1 to 16, the local at least ratio of this wall thickness is at sealing surface (9; 9 ') and inboard (10; Wall thickness 10 ') (H ') little.

18., it is characterized in that described inner seal ring (6 ') is located on the cover plate (2) of an outer shroud (5 ') with first threaded portion (30) by each described plastics closure of claim 1 to 17.

19., it is characterized in that described seal bootr (101,101 ') has at least one shaping district as predetermined breakdown zone (140) by one of claim 1 to 18 described plastics closure.

20., it is characterized in that predetermined breakdown zone (140) is outer and/or interior notches (141,141 ') forms and this district has the plate (142) that a thickness (M) reduces at bottom section by one by the described plastics closure of claim 19.

21., it is characterized in that described recess (141) is a circular groove by the described plastics closure of claim 19.

22., it is characterized in that described recess (141) is located at closed cap (103) position between two star flatung shape strengthening ribs (11) by one of claim 19 to 21 described plastics closure.

23., it is characterized in that inner seal ring (6) has the shaping length (113) facing to the local at least withdrawal of piece (126) or threaded portion (130) of curling by one of claim 1 to 22 described plastics closure.

24., it is characterized in that described outer shroud (5) has one and taking off plastics closure (1 by one of claim 1 to 23 described plastics closure; 101) show and the molded arris of permanent deformation as opening afterwards.

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