EP0899211B1 - Plastic bottle - Google Patents

Abstract

The bottle is double-walled (20, 21), whereby the outer wall (21) extends beyond the inner wall (20) to seal to a flexible base (5) which contacts the wall only on the inside. Preferably the base is also double-walled and comprises two diaphragm-like members (50, 51) which abut each other at their peripheries and seal individually or jointly against the inner bottle wall.

Description

The present invention relates to a plastic injection-molded bottle for intake and dosing Dispensing liquids.

Various liquids are known, only in small Amounts are required, are extremely sensitive to light and have a high diffusion and permeation coefficient, that means are strongly diffusing. Under the influence of light decay products can occur or oxidation can occur, during the diffusion the composition of the product can change. For example, Evaporation of a solvent the drug concentration of a drug to a questionable extent. In any So the shelf life of the packaging packaged good influences.

Glass containers are good gas diffusion barriers, but they are their translucency is only possible using expensive special glass reducible. Pipettes must then be used to dose the contents are used, which are extremely expensive and others Problems with gas diffusion in the area of the bellows bring oneself.

Plastic bottles are therefore an alternative. Most plastics that can be used by injection or blow molding have no particularly advantageous values Translucency and permeation and diffusion density. Because of the three steps of permeation, absorption, the Diffusion and desorption, generally diffusion solely determining the speed is only intended in the following we can still talk about diffusion, but without absorption and exclude desorption. You work with spraying equipment, so the wall thickness can be accordingly be honored. Then the container becomes like this rigid that the liquid withdrawal only by pipette becomes possible.

From FR-A-2 687 568 an injection-molded bottle is known which is made of several parts. Here, practically two containers are single manufactured and then pushed into each other and so assembled into a double-walled container.

Another alternative is plastic bottles to blow in multiple layers. So two or three layers can be Manufacture bottles with appropriate barrier layers. This are generally provided with approximately the same wall thickness everywhere. Such containers are relatively expensive and needed appropriate machines that only in a few, plastic processing Establishments exist at all. The squeezable Plastic bottles allow the dosage of Liquid, but this is only possible with great sensitivity. Well the wall thickness for blown containers essentially is almost the same everywhere, the container deforms over the entire container wall when the container is squeezed together becomes. This makes it difficult to dispense small quantities.

It is therefore the object of the present invention to make one To create plastic injection molded bottle that avoids the aforementioned problems.

This contradictory task is solved by a bottle of the beginning mentioned type with the features of claim 1.

Further advantageous embodiments come from the dependent ones Claims and are in the following Description explained.

Figur 1

einen zentrischen Vertikalschnitt durch die erfindungsgemässe Flasche mit Verschluss im geschlossenen Zustand und

Figur 2

dieselbe Ansicht derselben Flasche im geöffneten Zustand.

Figur 3

zeigt eine Aufsicht auf die Flasche und den Verschluss.

Figur 4

zeigt einen axialen Teilschnitt durch den Boden und das untere Flaschenende.

A preferred embodiment variant of the subject matter of the invention is shown in the drawing and is shown in detail using the following description.
It shows:

Figure 1

a central vertical section through the bottle according to the invention with closure in the closed state and

Figure 2

same view of the same bottle when opened.

Figure 3

shows a top view of the bottle and the cap.

Figure 4

shows an axial partial section through the bottom and the lower end of the bottle.

The bottle 1 according to the invention has the general structure usual plastic bottles. It consists of one Container 2, the cavity for receiving the liquid forms the via a shoulder 3 in the bottle neck 4th transforms. The bottle is at the bottom of a bottom 5 and above from a closure 6 screwed onto the container neck 4 sealed closed.

Two concentrically arranged walls run from the shoulder 3 20 and 21 down to the floor 5. The two concentric In principle, walls 20 and 21 can have any course so that the cavity they enclose is cubic, cylindrical or oval in cross-section. From manufacturing technology However, the inner wall runs for reasons 20 and the outer wall 21 parallel. The outer wall 21 extends down further than the inner wall. For one preferred embodiment of the bottom of the bottle is this One condition. The inner wall 20 and the outer wall 21 are spaced from each other, the wall thickness decreases conically from the shoulder 3 to the bottom 5, so that the distance between the facing surfaces of the Walls 20, 21 increases from top to bottom. The outer wall 21 has a slightly inwardly projecting ring bead at the lowest end 22 on, which serves to hold the bottom 5.

The base 5 of the bottle 1 is made of two elements 50, 51, which together form a flexible, elastically deformable double-walled base. The two elements 50 and 51 are membrane-like and do not lie over the entire surface, but only on the periphery, that is to say at the edges. Thus, the two elements 50 and 51 together form a peg-like hollow body. The inner or upper element 50 is a rondelle, with an edge 52 which is designed in such a way that it can grip around the inner wall in a form-fitting manner and is then pulled upward along the inner surface of the inner wall 20. The actual surface 53 of the roundel is cambered outwards in relation to the cavity of the container 2. A pin-shaped projection 54 projecting outwards is molded onto the outer surface, centrally on the inner element 50, and is part of a contact point 55 as a connection between the inner element 50 and the outer element 51.
The outer element 51 is also shaped like a rondelle, which of course is only the case if the walls 20, 21 of the container 2 are cylindrical. Seen from the plane of contact of the two elements 50, 51, this rondelle has an outermost edge 56 projecting downwards, which in the assembled state of the bottle, that is to say in particular when both elements 50, 51, which form the base 5, are inserted on the annular bead 22 rests on the inner surface of the outer container wall 21. This edge 56 merges from the plane of contact with the inner element 50 into a thinned membrane surface 57 which is cambered outwards from the said plane of contact, but not beyond the lower edge of the outer container wall 21. The membrane surface 57 is flattened centrally and has a concentric corrugation 58, which characterizes the outer pressure surface. On the inside, the membrane surface 57 has a central upward pointed pin 59 which, when assembled, projects into the hollow extension 54, so that a positive and non-positive connection point 55 between the upper, inner element 50 and the outer, lower element 51 of the soil arises.
The bottle neck 4 is also double-walled here. The inner wall 40 of the bottle neck 4 extends directly from the shoulder 3 and is thus connected in one piece and in a sealing manner. The inner bottle neck finally opens into the spout-shaped pouring opening 42, in which a sealing pin 44 is held, spaced centrally via webs 43, which cooperates with the closure 6 of the bottle 1. The sealing pin 44 and the webs 43 are also injection molded in one piece together with the bottle neck 4, the shoulder and the container 2. The bottle neck 4 has two zones, namely a tapering zone in which the bottle neck 4 narrows from the shoulder 3 to the width of the pouring opening 42 and a sealing zone 46 in which the bottle neck forms a cylindrical sliding seal together with the closure.

One concentric to the outside runs on the Shoulder 3 outer wall 41 protruding vertically upwards. This is, however, only up to the level of the beginning of the sealing zone 46 pulled up. This outer wall 41 has an external thread 47th

The arrangement of the external thread 47 for fastening the closure 6 on a separate cylindrical wall, allowed a high accuracy of the mass, creating an additional Tightness is achieved, although this seal is only of tertiary Meaning is.

The closure 6 is by an actual screw cap 60, which cooperates with the sealing pin 44, formed. Similar the bottle neck 4, the screw cap also has two areas, namely the lower mounting area 61, the with an internal thread 63 is provided, which with the external thread 47 of the outer bottle neck wall 41 cooperates, and a sealing region 62 connected to it in one piece. The inner surface of the sealing area 62 forms with the outer surface the sealing zone 46 of the bottle neck is extremely precisely fitting sliding seal. The screw cap runs in at the top a pouring spout 64. The pouring spout 64 runs to the opening 65 tapered together, the tightening angle being slight is larger than the tightening angle of the equally conical Sealing pin 44. The inner edge of the opening 65 is additional still designed as a sealing lip 66.

Boden 5

- aus äusserem Bodenelement 51 und innerem Bodenelement 50

Behälter 2

- aus innerer Behälterwand 20 und äusserer Behälterwand 21

Flaschenhals 4

- in der unteren Befestigungszone des Flaschenhalses durch die Verjüngungszone 45 des Flaschenhalses und der etwa konzentrischen Wand 41
- sowie im Dichtbereich durch Dichtzone 46 des Flaschenhalses mit dem Dichtbereich 62 des Schraubdeckels 60

The bottle described so far has a double wall from the bottom to the top. This is ensured from bottom to top by:

Floor 5

- From outer base element 51 and inner base element 50

Container 2

- From inner container wall 20 and outer container wall 21st

Bottle neck 4

in the lower fastening zone of the bottle neck through the tapering zone 45 of the bottle neck and the approximately concentric wall 41
- And in the sealing area through the sealing zone 46 of the bottle neck with the sealing area 62 of the screw cap 60

In the screw cap 60 you can still see a stop 67, the when put on in the space between the inner and the outer wall 40, 41 of the bottle neck protrudes and there cooperates with a counter-element, not shown here, to prevent the closure from being unscrewed 6 to prevent.

Ultimately, shoulder 3 of bottle 1 is for those here application of interest specially designed. As in the view seen from above in Figure 3, the Shoulder 3 over the container wall to the outside and so forms an oval support 30, which is also here by a bottom stiffening edge 31 designed particularly strong is.

Thanks to this configuration, the bottle according to the invention can be held like an injection syringe. Here lie Index finger and middle finger on the protruding on both sides Hold 30 on while thumb on floor 5 rests. Accordingly, one can exactly with the thumb exert the required force on the floor to achieve an exact Allow drop-by-drop delivery if desired.

In a particularly inexpensive variant, it is possible the two membrane-like elements 50, 51 via a joint to be interconnected and, if necessary, additionally one of the two membranes 50, 51 on one of the two concentric container walls 20,21 pivotable. The joint production of both membrane-like elements in one Form is always possible. Before assembling these need only to be folded together.

With certain materials, the design of the double-walled floor still not work. Have so Trials have shown that certain adhesives are too big Would require wall thickness so that the required Soil flexibility is no longer guaranteed and that Material can no longer be pressed.

Here you have an extremely fantastic, but not generally applicable solution found. It will be with one single-layer one-piece bottom 5 worked. This floor has an edge sealing area 500, which compared to the centric area 501 a significantly increased wall thickness having. The central wall area 501 has a center in it arranged pusher element 502, which to the footprint protrudes the bottom 5, but not to the bottom of the outer container wall 21 is sufficient. Around pusher element 502 runs concentrically outwards towards the base arched ring surface 503 by pressure on the pusher element is reversible.

The closes at the concentric ring surface 503 circumferential sealing area 500. The inner wall 20 of the Container 2 lies in an annular groove 504 in the sealing area 500. A first seal is made by a sealing bead 505 rests on the inside of the inner wall 20. A second Sealing is carried out by a circumferential sealing lip 506 on the peripheral edge of the bottom 5. The sealing lip 506 lies sealing against the inner wall surface of the outer wall 21.

One wonders why the single-layer, relatively thin wall of the Soil 5 is sufficient here, while the rest Bottle is not enough and a double wall requirement. In fact, the floor seals only a slight Does not form the surface of the entire container. Much more the thin walls lead to rapid diffusion. Different materials then carry along on the contact surface the floor immediately to a reaction and thereby forms a passivating layer. This simple solution can be Realize only with certain ingredients, such as with certain adhesives and only under the condition that the floor area to the entire container area is small.

Claims (12)

1. In a bottle (1) for reception and metered delivery of a liquid, injection molded from plastic and having a cap (6), characterized in that: the bottle (1) having at least one double-walled single piece container (2) closed by a separate flexible, elastically deformable bottom (5), an outer container wall (21) of the bottle (1) being longer than an inner container wall (20) of the bottle (1), and the bottom (5) extending around the inner container wall (20) on an inside surface and an outside surface and resting against and sealingly closing an inside surface of the outer container wall (21).
2. In the bottle in accordance with claim 1, wherein the bottom (5) is double-walled formed by two diaphragm elements (50, 51) which peripherally rest against each other, and at least one of the diaphragm elements (50, 51) form a seal on the inner container wall (20).
3. In the bottle in accordance with claim 2, wherein each of the diaphragm elements (50, 51) forms a flanged surface.
4. In the bottle in accordance with claim 2, wherein a hinge connects the diaphragm elements (50, 51) with each other.
5. In the bottle in accordance with claim 2, wherein one of the diaphragm elements (50) extends around and along the inner container wall (20), inverted toward an interior of the bottle (1) and thereafter arched toward an exterior of the bottle (1), the other of the diaphragm elements (51) sealingly rests on the inner surface of the outer container wall (21) and extends arched toward the outside, and an arched section of the one diaphragm element (50) projects no further than the outer container wall (21) in an axial direction.
6. In the bottle in accordance with claim 2, wherein the diaphragm elements (50, 51) are connected with each other at least at a center pin-shaped contact place (55).
7. In the bottle in accordance with claim 1, wherein the bottle (1) has a shoulder part (3), from which the inner and outer container walls (20, 21) extend concentrically toward the bottom (5).
8. In the bottle in accordance with claim 7, wherein starling at the shoulder part (3) two approximately concentric, upward oriented walls (40, 41) which are centered and inwardly offset with respect to the inner and outer container walls (20, 21), form a double-walled bottle neck (4).
9. In the bottle in accordance with claim 7, wherein the shoulder part (3) extends outward (30) at least partially over an outermost of the inner and outer container walls (20, 21).
10. In the bottle in accordance with claim 8, wherein an outermost one of the two walls (40, 41) has an external thread (47) with which a screw top (60) of the cap (6) mates, and a sealing pin (44) which cooperates with the cap (6) is formed on an inside surface of an innermost of the walls (40, 41) of the bottle neck (4).
11. In the bottle in accordance with claim 10, wherein an outermost end of the innermost wall (40) rests against an inner screw top wall (62) of the screw top (60) as a sliding sealing surface, so that in a closed state of the cap (6) the double-wall continues from a pouring spout in the cap (6) to the bottom (5).
12. In the bottle in accordance with claim 1, wherein the bottom (5) is of one piece and one layer and has a centered push element surrounded by a concentrically arched annular surface which can be inverted.

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