Package with a bag and a head part

A package (11) has at least one bag (12, 13) and a head part (16) having a bottom part (17, 37) including a recess (19; 39), an outlet opening (20, 40) and an elevation (22, 42) which at least partially encloses a rim area of the recess (19; 39) and which projects over the bottom part (17, 37) axially toward the bag (12, 13), and a piercing device (21, 41) for the bag (12, 13).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a package with at least one bag and a head part having a bottom part with a recess and an outlet opening, and a piercing device for the bag.

2. Description of the Prior Art

Packages of the type mentioned above are used for dispensing and storing substances, in particular hardenable substances such as mortar substances, putty substances, sealing substances, adhesive substances, and the like in single-component or multi-component form. For example, fastening elements are chemically anchored in previously drilled bore holes in a substrate, e.g., a mineral substrate such as concrete or masonry, by means of a hardenable substance which is dispensed from the package.

The substance which is stored in the bag is opened directly at the place of use and is dispensed from the package with a press-out device adapted to the package. After the package is emptied, it is replaced with a new package. Packages with a bag and a head part are widely used as representing flexible, reliable and economical packagings for the substances to be pressed out.

However, opening the bag which is formed, for example, as a foil bag presents a substantial challenge. Particularly in the case of multi-component substances, the individual components may only come into contact with one another shortly before applying the substance. Further, the influx of air can change the properties of the substance stored in the bag.

DE 295 01 255 U1 discloses a package for a two-component substance with two bags and a head part having a bottom part with a recess, an outlet opening, and a piercing device in the form of two piercing spatulas for each bag. The piercing spatulas extend along one another and parallel to one another approximately parallel to the axis of the outlet opening, and are arranged inside the axial projection of the outlet opening. The bag is supported radially and axially by this arrangement of the piercing spatulas. A pressure applied to the bag by a press-out device results in a local overexpansion of the area of the bag between the piercing spatulas until the bag bursts over a large surface.

In certain cases, when opening the bag in the known solution, the bag is only perforated by the piercing device and therefore does not burst to the desired extent. This may lead to small holes in the bag which block the passage of the substance to be applied so that the press-out pressure required for pressing out the substance is significantly increased. Accordingly, in the case of multi-component substances, inhomogeneous mixing may possibly result.

SUMMARY OF THE INVENTION

It is the object of the invention to provide a package with a bag and a head part that facilitates opening of the bag.

According to the invention, an elevation which at least partially encloses a rim area of the recess and which projects over the bottom part axially toward the bag is provided at the bottom part.

The elevation forms an axial support for the bag that is fixed to the head part. When pressed against by the package, the bag is tensioned between the elevation and the bottom before contacting the piercing device and is then ripped by the latter in the pretensioned state. Owing to the pretensioning which is applied beforehand, the ripping of the bag in the opening area is improved compared to known solutions, which ensures that the holes that are formed are sufficiently large for the to-be-applied substance to flow through.

In addition, the elevation prevents the applied substance from flowing backward out of the recess in the bottom part so that substantially the entire amount of substance can be dispensed, excluding a small residual amount.

Further, when the bag is fixed in the head part, the elevation forms a stop which assists in a correct mounting of the bag. The bag is fixed in the head part by a glue connection, for example.

The minimum axial height of the elevation preferably corresponds to the axial height of the piercing device so that the bag does not contact the piercing device in the fixed state. Accordingly, the application of pressure to the bag ensures that the bag is pretensioned in the opening area before this opening area comes into contact with the piercing device and is pierced.

The head part advantageously has a circumferential rim with an axial height, and the maximum axial height of the elevation corresponds to one half of the axial height of the rim. Along with the bottom part, the circumferential rim of the head part forms a receptacle for an end area of the bag. By limiting the maximum height of the elevation to one half of the axial height of the rim, there is a sufficiently large contact surface between the head part and the bag to secure the latter to the head part.

The elevation preferably has a first area with a first axial height and a second area with a second axial height, which is greater than the first axial height, and a portion connecting the two areas. The first area of the elevation is advantageously provided at the radial inner side of the bottom part. Owing to the construction of the elevation, the end area of the bag makes contact along it entire extension in the mounted state, which leads to an advantageous pretensioning of the bag in the opening area before contacting the piercing device when the bag is acted upon.

The portion connecting the two areas preferably has a continuously extending axial rim so that an advantageous contact edge is created for the bag that is fixed in the head part.

The package preferably has at least two bags and the head part has at least two bottom parts. At least one bottom part has an elevation which at least partially surrounds the recess and projects axially over the respective bottom part. A package of this kind serves to dispense and store multi-component substances. The head part is advantageously formed of one piece. Alternatively, the head part can be formed of a plurality of parts so that, for example, individual components of a multi-component substance can be combined when needed, and the plurality of parts can be assembled to form a package. A head part, which can be assembled in a modular manner, advantageously has correspondingly formed connection means such as, for example, snap elements.

Each bottom part preferably has an elevation which at least partially surrounds the recess and projects axially over the bottom part so as to ensure an advantageous opening of each bag.

Identical parts are provided with identical reference numerals in the drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The package11, which is shown inFIGS. 1 and 2, has two bags12and13and a head part16. The head part16has a mixer connector27into which two outlet openings20and40open. The two outlet openings20and40are provided for the substance to be dispensed.

Further, the head part16has a first bottom part17with a radially circumferential, axially projecting rim18having an axial height A and forming, with the first bottom part17, a first receiving space for an end area of the bag12. A recess19, the outlet opening20and two piercing spatulas, which form piercing means21for the bag12, are provided in the first bottom part17. The piercing means21is arranged in the outlet opening20. Further, an elevation22surrounds a rim area of the recess19and projects over the first bottom part17axially toward the bag12. The recess19forms a passage for the outlet opening20in the bottom part17. The recess19has a bottom part28which is arranged at a distance from a side29of the bottom part17facing the bag12.

The elevation22has a first area23with a first axial height C and a second area24with a second axial height E which is greater than the first axial height C, and a portion25which connects the two areas23and24and which has a continuously extending axial rim26. The minimum axial height C of the first area23of the elevation22is 2 mm and corresponds to the axial height F of the piercing device21with respect to the first bottom part17. The axial height E of the second area24of the elevation22is 4 mm and is smaller than one half of the axial height A of the rim18of the first bottom part17. Further, the elevation22has a width B that is selected in such a way that the elevation22forms a supporting surface and contact surface for the bag12without damaging the latter.

Further, the head part16has a second bottom part37with a radially circumferential, axially projecting rim38having an axial height M and forming, with the second bottom part37, a second receiving space for an end area of the bag13. A recess39, the outlet opening40and two piercing spatulas, which form a piercing device41for the bag13, are provided in the second bottom part37. The piercing device41is arranged at the outlet opening40. An elevation42surrounds the rim area of the recess39and projects axially over the second bottom part37toward the bag13. The recess39forms a passage to the outlet opening40on the bottom part37. The recess39has a bottom part48which is arranged at a distance from a side49of the bottom part37facing the bag13.

The elevation42has a first area43with a first axial height N and a second area44with a second axial height O which is greater than the first axial height N, and a portion45which connects the two areas43and44and which has a continuously extending axial rim46. The axial height N of the first area43of the elevation42is 2 mm and corresponds to the axial height P of the piercing device41with respect to the second bottom part37. The axial height E of the second area44of the elevation42is 3 mm and is smaller than one half of the axial height M of the rim38of the second bottom part37. The exposed axial rim of the elevation42forms a supporting surface for the bag13.

According to an alternative embodiment of a package only one of the recesses, e.g., the recess39, is at least partially surrounded by an elevation, elevation42.