DE19940705A1 - Closable glass container with a plastic cover for holding various products comprises a bottom section which is arched outwards - Google Patents

Abstract

Closable glass container with a plastic cover for holding medicinal and cosmetic products, as well as foodstuffs and drinks comprises a bottom section (3) which is arched outwards.

Description

The invention relates to a closable glass container with a Plastic coating that is exposed to a relatively high internal pressure during operation is, and the a jacket part with a molded outflow opening that one to the has respective closure type adapted edge area, as well as with integrally formed bottom part.

Such coated glass containers are used especially for medical Purposes used, but also find for cosmetic purposes or for Storage of food and drink application.

Glass containers containing a substance are particularly useful take up increased pressure. The plastic coating is said to achieve this that glass fragments are held together if the coated one Glass container breaks. The plastic coating thus serves as a burst and / or splinter protection. Such closable glass containers that are relative are exposed to high internal pressure, in particular pressure vessels with medicinally or cosmetically active substances and a propellant can be filled under pressure and their opening with a dispensing element, especially metering valve, is closable. In connection with one Dispensing head, which cooperates with the dispensing member so that the Pressing both parts against each other the delivery member is actuated and one certain amount of the medicinally or cosmetically active substance as If aerosol emerges from a spray opening, these products serve as applicators  for medical applications, especially in asthmatics and others Bronchial problems, or as an atomizer for perfume or the like.

Such a glass container in the form of a glass vial that with a Injection-molded plastic sheath is shown, for example, by DE 196 32 664 A1. In the known case, the extrusion-coated glass vial has a pronounced one flat floor with only a little pronounced curvature in the transition from flat bottom to the bottle coat.

The internal pressure resistance of such glass containers, decisive for the Pressure with which the glass containers can be filled safely, as well as the durability against external pressure, decisive for the applicable pressures during application of the plastic coating, as well as the load capacity by a load in the axial Direction, for example, applied by the user during the application is therefore limited. For example, glass hollow bodies are generally considered to be not processable in conventional injection molding, in which one Plastic cover with a pressure of up to 300 bar and a temperature of sprayed up to 270 ° around the glass container, the so-called glass inlet becomes.

The design of the base of the known glass inlets follows the standardized configuration of containers made of tubular glass and metallized glass, which have a largely flat base, typically provided with a base indentation. This is to ensure the stability during the manufacture, testing, transport and further processing of the glass inlets, in the interest of good handling of the glass inlets. The standard DIN ISO 8362 shows in part 1 a typical example of an injection bottle made of tubular glass with a drawn-in bottom and in part 4 injection bottles made of cottage glass, namely in figure 1, a typical example of an injection bottle for insulin with a flat bottom and in figure 2 an example of an injection bottle for antibiotics with retracted bottom.

Also the containers and accessories for pharmaceuticals according to the DIN standard ISO 11418, in part 1 for dropper bottles, in part 2 for threaded bottles for Syrups, in part 3 for threaded ashes for solid and liquid medicines (veral), in part 4 for tablet bottles and in part 5 for pipette assemblies, show containers with the typical bottom indentation.

The invention has for its object the above closable glass container with a plastic cover that is operational is exposed to a relatively high internal pressure, and with a jacket part molded outlet, which one to the respective type of closure has an adapted edge area and has a molded-on base part, to be trained in such a way that they are to a high degree resistant to internal pressure and at the same time are resistant to high external pressure, and also in the axial direction can be loaded with a relatively high load.

This object is achieved according to the invention in that the Floor is curved outwards.

The glass containers according to the invention are distinguished by the following properties:

• 1. Internal pressure resistant up to at least 30 bar internal pressure
• 2. Resistant to external pressure of over 200 bar (up to approx. 350 bar)
• 3. Can be loaded with a load in the axial direction of at least 1000 N.

The high internal pressure resistance enables the inventive Filling and using glass containers as so-called aerosol containers, in particular as an applicator for medical applications or as Atomizers for perfume or the like.  

Because of the high internal pressure load capacity, such a container can also instead of pump systems operated by propellants filled under pressure become. An inflow of air to ensure the function of the pump Systems is not necessary. This can advantageously result in product oxidation can be avoided by atmospheric oxygen and there are no problems possibly co-flowing microorganisms.

The plastic coating can be done in different ways, for example by dipping in a plastic bath or by spraying of a plastic. However, the glass container in the Injection molded around.

Due to the inventive design of the glass container, it survives also the conventional injection molding process, in which from one thermoplastic, such as PP, PE, PET, PS, a plastic sleeve with a pressure of up to 300 bar and a temperature of up to 270 ° C the glass container is sprayed around.

As an alternative to the conventional injection molding technology, the Plastic coating from at least one reactive cross-linking plastic in the Ways of injection molding applied by the reaction injection molding technique become. In this process, the plastic is at relatively low Injection pressures (below 10 bar) and relatively low mold temperatures injected, reducing the wall thickness of the glass container and nevertheless the committee can be reduced.

In addition, the reactive crosslinking plastics can withstand higher temperatures as the aforementioned thermoplastics are exposed, so that the overmolded Glass containers can be sterilized using superheated steam in an autoclave. This is essential for medical applications. Also  can be filled with glass already closed with a dispenser be provided with the plastic coating.

Both injection molding techniques are known and therefore do not need to be described in more detail here to be explained.

The glass containers according to the invention are typically more common Wall thickness an internal volume of up to 35 ml. There are also glass containers with an inner volume of up to 70 ml can be produced, but then with one reduced internal pressure load capacity up to approx. 20 bar, which for certain Applications with low internal pressure are sufficient.

Since the invention is applicable to closable glass containers, the Configuration of the glass container also with the container opening in the Include considerations d. H. the necessary execution of the The opening edge of the glass container limits the freedom of design. The glass containers according to the invention typically have either one Screw head or a crimp rim on which a delivery organ, a Standard valve that is crimped tight.

Another limitation results from the maximum wall thickness with which the glass container according to the invention can be made from tubular glass. If the wall thickness is too large, the required degree of deformation is too high; the Glass containers can then not be manufactured within the required tolerance range become.

In principle, the glass container is also made of metallized glass, especially in IS Process (press-blow process) can be produced, the injection molding process is encased.  

The plastic-coated glass containers according to the invention are preferably suitable for pharmaceutical packaging, but there are also special advantages when packaging cosmetic products, such as perfume, eau de toilette, aftershave, etc.:

• - There is great design freedom for the outer packaging, i. H. around a molded part can pass through the glass container, the glass inlet Plastic injection molding can be applied directly, which only the Design constraints of the injection molding process is subject.
• - There is an easy way to attach the glass container to the particular one Adjust dosing system.
• - The plastic casing can be flavored with plastics (for example with the smell of vanilla).
• - The glass inlet is neutral towards the filled media, e.g. aroma and smell substances are not through the packaging material changed what is particularly important for perfume, eau de toilette, Aftershave or the like.
• - It can meet the increasing quality requirements for cosmetics and thus the packaging requirements (e.g. the requirement for the elimination of preservatives). The material glass therefore offers an optimal one for these products Product protection.
• - The coated glass container is easy to close thanks to standard dosing systems close.

Using in the drawings shown in partial longitudinal sections Embodiments of the invention encased in plastic The invention describes the glass container in more detail.  

Show it:

Fig. 1 a glass container with a fully outwardly curved bottom portion and a Crimprand at the outflow port,

Fig. 2 is a glass container analogous to FIG. 1, but with a central constriction,

Fig. 3 is a glass container analogous to FIG. 1, but with a specially designed head part adapted to the crimping of metering valves,

Fig. 4 a glass container analogous to FIG. 1, but with a threaded head instead of the Crimprandes,

Fig. 5 is a glass container with a non-rotationally symmetrical cross-section, a fully outwardly bulged bottom portion and a threaded head at the outlet opening and

Fig. 6 shows a glass container with a crimp rim similar to Fig. 1, but with a bottom part that is not completely curved outwards.

Fig. 1 shows in a partial longitudinal section of a Glasinlet provided with a sprayable as an aerosol medically or cosmetically active substance can be filled. On the container jacket 1 , an outflow opening is formed with a crimp rim 2 , on which a metering valve can be attached. The floor 3 is completely curved outwards.

The following relationship preferably exists for the base radius R, the container diameter D and the dimension S of the outer curvature:

A plastic coating 4 is applied to the glass inlet by a known method, preferably by the injection molding method, which in FIG . T., on an enlarged scale, is indicated. In the bottom part 3 , the coating is applied in such a way that a flat standing surface is created over the glass container cross section. In the upper part of the container, the coating extends to the edge 2 of the outflow opening, ie includes the crimp rim 2 . Because of the lower mold temperatures in the reaction injection molding process, a metering valve can, however, also be placed on the crimping rim 2 before applying the coating, and only then can the coating be applied.

FIG. 2 shows a glass inlet similar to the glass container according to FIG. 1, which is provided with a central constriction 5 . Such glass inlets are preferably used for cosmetic products, perfumes, eau de toilettes, aftershave. For the sake of simplicity, the plastic covering 4 of FIG. 1 is not shown in FIG. 2.

Such glass containers with a central constriction are not limited to the crimp rim 2 ; they can also be provided with a differently designed bottle opening.

The dimensions preferably apply to the glass container according to FIG. 2:

Fig. 3 shows a glass container corresponding to Fig. 1, but which has a special head design with a special crimp rim 2 'for mounting a standard metering valve.

Otherwise, the configuration corresponds to that of FIG. 1, which is underlined by the equality of the reference numerals. The relationship between the outer curvature S, the base radius R and the diameter D corresponds to that in FIG. 1. Analogously to the illustration in FIG. 2, the plastic coating 4 is not shown in FIG. 3 for the sake of simplicity.

Instead of a crimp rim, the glass inlets can also have a glass thread, in particular a thread standardized according to DIN, such as GL 45 K, for a screw closure.

Such an embodiment is shown in FIG. 4. It shows a glass container corresponding to FIG. 1, but which has a threaded head 2 "for a screw closure. According to the explanations for FIG. 3, the configuration of the glass container corresponds to that of FIG. 1.

While the glass containers described so far are designed to be rotationally symmetrical with a circular cross-section, a non-rotationally symmetrical glass container with a screw cap 2 "is shown in FIG. 5. As part A of the figure shows, the cross-section in this embodiment is almost square with rounded longitudinal edges.

The relationship also applies to this glass container:

Otherwise, the explanations for FIGS. 1 to 4 apply accordingly.

In the embodiments according to FIGS. 1 to 5, the bottom 3 of the glass container is curved outwards over the entire cross section. For applications with lower pressure loads, it is sufficient if the floor is not arched over the entire cross section. Such an embodiment of the glass container is shown in FIG. 6.

The bottom 3 'of this glass container has a pronounced curved area 3 a with a relatively small flat middle part 3 b.

Otherwise, the representation in FIG. 6 corresponds to that in FIG. 1.

Analogous to DE 196 32 664 A1 cited at the outset, the casing 1 of the glass inlets can have hole-like pressure compensation openings.

The glass containers can, for example, be made of borosilicate glass or a lime Soda glass exist.

The wall thickness of the glass container is determined by the application, d. H. in particular the amount of internal pressure in the application, with Boundary conditions through the manufacturing process of the glass container and the Process for covering the glass container with a plastic jacket. she is typically on the order of 0.75 mm to 2 mm. The fat the plastic coating is of the order of 1-2 mm.

The thickness of the coating can vary over the height of the container optimize certain container areas. The plastic coating can also be used the container height consist of different plastics. The Plastic cover at least partially fiber-reinforced.  

The plastic coating can also have its cross section different plastics exist or be applied so that the integral density varies across the cross-section, each with the denser, fixed Layer as outer surface.

The encased glass container can also be specifically optimized in this way.

Claims (12)

1. A closable glass container with a plastic coating ( 4 ), which is operationally exposed to a relatively high internal pressure, and which has a jacket part ( 1 ) with an integrally formed outlet opening, which has an edge area ( 2 , 2 ', 2 ") adapted to the respective closure type, and with a molded-on base part ( 3 , 3 '), characterized in that the base ( 3 ) is curved outwards. 2. Glass container according to claim 1, characterized in that the curvature of the bottom ( 3 ) extends over the entire cross section of the glass container. 3. Glass container according to claim 1, characterized in that the curvature of the bottom ( 3 ') extends only over a pronounced part ( 3 a) of the cross section, with a small-area flat bottom middle part ( 3 b). 4. Glass container according to one of claims 1 to 3, designed as a glass vial which can be filled under pressure with a sprayable substance as an aerosol and a propellant, which has a tapered neck part with a bead-like end rim ( 2 ) for mechanically attaching a dispensing member to the opening which the opening of the glass vial can be closed, and which is encased by the plastic coating ( 4 ) in such a way that it also encompasses the bead-like end edge ( 2 ) or the dispensing element already applied. 5. Glass container according to one of claims 1 to 4, characterized in that several, preferably hole-like pressure equalization openings are formed in the plastic coating ( 4 ). 6. Glass container according to one of claims 1 to 5, characterized characterized in that the cross section of the glass container is rotationally symmetrical. 7. Glass container according to one of claims 1 to 5, characterized characterized in that the cross section of the glass container is not is rotationally symmetrical. 8. Glass container according to one of claims 1 to 7, characterized in that the glass container has a central constriction ( 5 ). 9. Glass container according to one of claims 1 to 8, characterized in that the edge region of the outflow opening is designed as a crimp rim ( 2 , 2 '). 10. Glass container according to one of claims 1 to 8, characterized in that the edge region of the outflow opening is designed as a threaded head ( 2 "). 11. Glass container according to one of claims 1 to 10, characterized in that the plastic coating ( 4 ) is applied by means of injection molding. 12. Glass container according to claim 11, characterized in that the plastic coating ( 4 ) is applied by injection molding according to the reaction injection molding technique.