Abstract
The invention relates to a container, in particular a plastic ampoule which is produced using a blow moulding process, and which is filled and closed in the production mould, said container having a sleeve-type neck part (4) connected to a container body (2) as an axial extension, said neck part forming a seat (6) for a pre-formed insert (8) extending along the axis (12) of the neck part (4), and said neck part being formed in the production mould, on a peripheral region (14) of the insert (8), characterised in that at least one sealing element (42; 68) is provided on the insert (8), said sealing element forming a seal in a sealing region surrounding the axis (12), in combination with a contact surface (38) formed on the seat (6) of the neck part (4).
Claims
1. A container, in particular a plastic ampoule, which is produced using a blow molding process, and which is filled and closed in the production mold, said container having a sleeve-type neck part (4) connected to a container body (2) as an axial extension, said neck part forming a seat (6) for a pre-formed insert (8) extending along the axis (12) of the neck part (4), and said neck part being formed in the production mold, on a peripheral region (14) of the insert (8), characterized in that at least one sealing element (42; 68) is provided on the insert (8), said sealing element forming a seal in a sealing region surrounding the axis (12), in combination with a contact surface (38) formed on the seat (6) of the neck part (4).
2. The container according to claim 1, characterized in that the sealing element (42; 68) is formed by a molded part of the insert (8) associated with the latter.
3. The container according to claim 1, characterized in that the sealing element (42; 68) adjoins the end of the peripheral region (14), on which the neck part (4) to the insert (8) is formed, facing the contact surface (38) of the seat (6).
4. The container according to claim 1, characterized in that the sealing element (42; 68) is formed by the edge of a ring (42; 68) formed on the insert (8) facing the contact surface (38) on the seat (6) of the neck part (4).
5. The container according to claim 1, characterized in that the ring-shaped sealing element (42) has the form of an axially protruding rib.
6. The container according to claim 1, characterized in that the sealing element (42) is rib-shaped and has a shape tapering towards the rim adjoining the bearing surface (38).
7. The container according to claim 1, characterized in that at least one axially protruding structural part (46; 74) is provided on the insert (8) extending offset radially inwards to the annular sealing element (42; 68) and beyond the former towards the container body (2).
8. The container according to claim 1, characterized in that the axially protruding structural part has the shape of a coaxial truncated cone (46) tapering in the direction of the container body (2), which has a concentric passage (36) that is open towards the container body (2).
9. The container according to claim 1, characterized in that the insert (8) forms a hollow cylinder (66) within the peripheral region (14), on the inner wall of which a plurality of axially protruding structure parts in the form of circumferentially arranged distributed wings (74) are provided, the free end regions (76) of which contact the inside of the collar part (10).
10. The container according to claim 1, characterized in that a hollow syringe cone (28) is connected at the end of the peripheral region (14) of the insert (8) facing away from the container body (2), the cavity (30) of which is flush with the bore-like passage (36) of the truncated cone (46), from which it is separated by a web (32) forming a wall part (34) that can be pierced for an extraction process.
11. The container according to claim 1, characterized in that there are surface irregularities (24, 26; 52; 54; 56; 58; 72) at the peripheral region (14) of the insert (8), which are formed by surface parts separated from each other by radially recessed or raised surface areas and arranged axially offset to the annular sealing element (42) towards the cone (28).
12. The container according to claim 1, characterized in that an over-mold closure cap (16) enclosing the syringe cone (28) is formed to the end of the neck part (4) facing away from the container body (2) forming a predetermined breaking point (18) enabling the separation from the neck part (4).
13. The container according to claim 1, characterized in that an integral, male Luer Lock (40) is formed on the insert (8), said Luer Lock having a closure part (92) connected to the over-mold closure cap (16) and when it is removed, can be removed together with the latter at a separation point (91) at the end of the Luer Lock (90), for opening the cone at the upper end of its cone (28).
14. The container according to claim 1, characterized in that the closure part (92) comprises a bar (93) extending axially away from the cone (28), integrated in the region of the handle parts (82, 84) serving as a turn-off knob in the over-mold closure cap (16).
15. The container according to claim 1, characterized in that the insert (8) is formed of at least two different materials, of which at least one is softenable at low temperatures.
16. The container according to claim 1, characterized in that the softenable material is a thermoplastic polymer having good adhesion properties to the polymer material of the container body, in particular a thermoplastic elastomer (TPE), and that there is another polymeric material having a higher softening temperature.
17. A method, which is provided in particular for the manufacture of a container according to claim 1, characterized in that the sealing element (42; 68) of the insert (8) is energetically treated, in particular heated, before its insertion into the blow-molding device (97, 99).
18. The method according to claim 17, characterized in that the operation of inserting the insert (8) in the blow-molding device (97, 99) is performed such that at first only an axial pressure force is applied, to ensure a fusion bond of the sealing element (42; 68) on the seat (6) of the neck part (4), and that then, delayed, radial forces are applied by closing of the head jaws (97) to achieve the serration of the surface irregularities (24, 26; 52; 54; 56; 58; 72) of the peripheral region (14).
Description
[0018] Below the invention is explained in detail using exemplary embodiments shown in the drawing.
[0019] In the drawings:
[0020] FIG. 1 shows the front view of an exemplary embodiment of the inventive container approximately enlarged by factor of 3 in relation to a practical embodiment;
[0021] FIG. 2 shows a longitudinal section of the exemplary embodiment, rotated by 90 in relation to FIG. 1;
[0022] FIGS. 3 and 4 show a perspective oblique view or a longitudinal section of the insert body of the exemplary embodiment of the container, magnified approximately 2.5-times in relation to FIGS. 1 and 2;
[0023] FIGS. 5 and 6 show the insert for a modified exemplary embodiment of the container corresponding to the representations of FIGS. 3 and 4;
[0024] FIGS. 7 and 8 show the insert body for a further modified exemplary embodiment of the container corresponding to the representations of FIGS. 3 and 4;
[0025] FIGS. 9 and 10 show a perspective oblique view or a longitudinal section of the insert for a further modified exemplary embodiment, as compared to FIG. 3 or 4 even more magnified and illustrated broken-off;
[0026] FIG. 11 shows a broken-off, perspective oblique view of an insert for a still further modified exemplary embodiment, drawn in the scale of FIGS. 9 and 10;
[0027] FIG. 12 shows the insert of FIG. 11 in a position mounted on the neck part of the associated container, in a broken-off and cut representation;
[0028] FIG. 13 a perspective oblique view of an exemplary embodiment of the container in the form of a small-volume bottle;
[0029] FIG. 14 shows a truncated longitudinal section of the exemplary embodiment of FIG. 13, wherein only the range of neck part and the closure cap is depicted;
[0030] FIG. 15 shows a longitudinal section of the insert of the exemplary embodiment of FIG. 8 and a heating device depicted as a diagram, wherein the state before insertion into the heating device is shown;
[0031] FIG. 16 shows a representation corresponding to FIG. 15 with the insert inserted into the heating device;
[0032] FIG. 17 shows a longitudinal section of the insert in the state after heating in the heating device;
[0033] FIG. 18 shows a greatly simplified longitudinal section of the blow-molding device for manufacturing a container according to the invention, wherein a step of the manufacturing process before the insertion of heated insert is shown;
[0034] FIG. 19 shows the production step in which the head jaws of the blow-molding device from FIG. 18 are closed, and
[0035] FIG. 20 shows a schematically simplified longitudinal section of the container taken from the blow-molding device.
[0036] The invention is described in reference to the drawings, based on exemplary embodiments, in which a container body 2 has a neck part 4, which forms a seat 6 for an insert 8, for the delivery of the liquid pre-stored in the container body 2 when the container is used. In the examples shown, the container body 2 has the shape of a collapsible ampoule having a cross-section shaped approximately like a rhombus.
[0037] The container body 2 made of plastic material by blow molding is designed, at a total volume of 2 ml, for a filling volume of 1.5 ml and has a collar part 10, forming, as a local restriction, the transition to the sleeve-like neck part 4 having a larger diameter. In doing so, the collar part 10 has the shape of a funnel, to which, coaxially to a container axis 12, the neck part 4 is connected in the form of a circular cylindrical sleeve, concentric to the axis 12.
[0038] The insert 8, which is separately shown in FIGS. 3 and 4, has the shape of an integrally formed rotary body made of plastic, concentric to the axis 12, wherein preferably the same material, or a material of the same class of materials, from which the container body 2, including the collar part 10 and neck part 4, is made, may be provided. In the manufacturing process according to the bottelpack method, where a plastic tube is extruded into a blow mold, in which the container body 2 including the collar part 10 is formed using main mold jaws and the adjoining container parts, like the neck part and optionally an adjoining cap, are formed using head jaws, the insert 8 is inserted into the seat 6 of the neck part 4 before the head jaws are closed. The subsequent closing of the head jaws, as is usual in the prior art, is used to form the neck part 4 to the associated peripheral region 14 (cf. FIGS. 3 and 4) of the insert 8. In the example shown in FIGS. 1 and 2, a closure cap 16 is formed to the end of the sleeve part 4, wherein a predetermined breaking point 18 is formed at the transition as a detachable separation point.
[0039] As can be seen in FIGS. 3 and 4, the insert 8 has a main part 22, to which the peripheral region 14 is formed, to which the neck part 4 is formed during the closing of the head jaws. In the performance of the mentioned bottelpack process, this is done after the container contents have been filled into container body 2 by means of a filling mandrel. Deviating from the form of a smooth cylinder jacket, the main part 22 shows surface irregularities at the peripheral region 14, which are formed by radially recessed surface areas 26 next to un-recessed surface areas 24. In the example of FIGS. 3 and 4, the recessed surface areas 26 are formed by circumferential grooves in the manner of annular grooves extending in the circumferential direction, i.e. the un-recessed surface areas 24 are shaped like annular ribs extending at an axial distance to one another. In this shaping of the peripheral region 14, a kind of serration is created when the neck part 4 is molded to the main part 22 of the insert 8, to secure the insert 8 in the seat 6 of the sleeve part 4 using the formed positive lock against any acting axial forces. A syringe cone 28 is formed on the end of the main part 22 of the insert 8 facing away from the seat 6, which forms the delivery end of the insert 8. In the example shown, the syringe cone 28 has an axial length that is greater than the length of the main part 22, and has an inner, coaxial cavity 30, which is closed at the end adjoining the main part 22 by a cross web 32, in which a central, recessed part 34 is formed. A coaxial bore-like passage 36, which is open at the end of the insert 8 facing the container body 2, is connected to the web 32. The recessed area 34 forms a region of reduced wall thickness in the web 32, which serves as perforation area for a hollow plastic mandrel, a double-ended cannula during extraction, similar to DIN EN ISO 7885 or DIN 13097-5, to extract container contents through the passage 36.
[0040] A step 38 is formed in seat 6 of the neck part 4 at the transition to the collar part 10 (cf. FIG. 2), which serves as a contact surface for a sealing element, which seals the insert 8 in the seat 6. The sealing element is formed by a molded part of the insert 8 itself. As can be best seen in FIG. 4, a ring 42 is formed on the end of the peripheral region 14 facing the container body 2 along the peripheral rim, to which an axial recess 44 is connected radially inwards in the form of an annular groove, i.e. the ring 42 forms an axially protruding annular rib. It is tapered, as FIG. 4 clearly shows, towards the axially protruding rim, with which it adjoins the contact surface at the step 38 of the seat 6, the tapered rib shape of the ring 42 forming an effective, narrow sealing region.
[0041] Radially inwardly from the recess 44, a coaxial truncated cone 46, at the end of which the bore 36 is open, tapering toward the container body 2, adjoins the main part 22. As shown in FIG. 2, in the inserted position the outer conical surface of the truncated cone 46 adjoins the inside of the funnel-like collar part 10, the truncated cone 46 forming a structural part centering the insert 8 in the seat 6 and supporting it against transverse forces.
[0042] FIGS. 5 and 6 show a modified exemplary embodiment, which differs from the example described above, only by a modified shape of the surface irregularities on the peripheral region 14 of the main part 22 of the insert 8. Instead of the recessed surface areas 26, which extend only in the circumferential direction, in the example of FIGS. 5 and 6, the recessed surface areas 26 extend both in the circumferential direction and in the axial direction, so that rib parts 52, and not closed annular ribs, are formed at the peripheral region.
[0043] FIGS. 7 and 8 show an exemplary embodiment with a further modified configuration of the peripheral region 14 on the insert 8, which corresponds to the examples described above, concerning the configuration of the sealing element in the form of a ring 42. As shown in FIGS. 7 and 8, a radially protruding annular body 54 having a rounded, bead-like shape, from which a crown of circumferentially distributed longitudinal ribs 56 extends in the direction of the syringe tip 28, is provided in approximately the central longitudinal section of the main part 22, wherein the longitudinal ribs 56, however, terminate at a distance in front of the syringe cone 28. The outside of the longitudinal ribs 56 has a rounded shape, as shown in FIG. 7. In this configuration, having surface irregularities at the peripheral region 14, a positive locking is formed between the neck part 4 and the insert 8 insert 8 formed thereto, which secures the insert 8, both by means of the longitudinal ribs 56 against rotation, and using the annular body 54, against axial movement.
[0044] FIGS. 9 and 10 show an example still further modified, in which a crown of longitudinal grooves 58 distributed around the periphery is disposed at the peripheral region 14 of the insert 8. Further, as shown in FIG. 10, the passage 36, extending in the truncated cone 46 and the cavity 30, extending towards the delivery end, are not separated by a radially extending transverse web 32, but an inner cone 62 extends from the truncated cone 46 into the cavity 30. The inner cone 62 is also shaped like a truncated cone, which is closed at the end located in the cavity 30 by a sort of diaphragm 64, which forms the perforation region.
[0045] FIGS. 11 and 12 show an exemplary embodiment in which the insert 8 forms a hollow cylinder 66 inside the peripheral region 14, the rim of which, facing the container body 2, forms a ring 68 having a curved surface as a sealing element, adjoining the contact surface at the seat 6 of the neck part 4 formed by the step 38 in a sealing manner. On the outside of the hollow cylinder 66, longitudinal ribs 72, which end at a short axial distance in front of the sealing element forming ring 68, are designed as surface irregularities distributed on the circumference. Axially protruding structural parts in the form of circumferentially distributed wings 74 are formed on the inside of the hollow cylinder 66, which extend in radial planes, and the free end parts 76 of which contact the inside of the collar part 10 at the mounting position and thus ensure a good axial centering in the seat 6 even for inserts 8 having larger diameters.
[0046] For easy detachment of the over-mold closure cap 16 at the predetermined breaking point 18, a rotary knob having laterally projecting handle parts 82, 84 is formed at the end part of the closure cap 16, as shown in FIG. 1.
[0047] The respective sealing element can apply the individually required sealing effect due to its being inherently stable; but it is also possible to melt the sealing element 42, 68, which then forms a solid, fluid-impermeable barrier to the other adjacent plastic material, by thermal input. Possibly resulting excess plastic material from the melting process can be displaced into the hollow groove 44 (cf. FIG. 4) and there serve as an additional filler material for welding, to achieve a homogeneous welded joint in this way.
[0048] FIGS. 13 and 14 show an alternative embodiment of the container in the form of a small volume vial, intended for a capacity of about 30 ml, in which the container body 2 is formed by a bellows, which can be compressed during an extraction process. As FIG. 14 shows, the insert 8, which is inserted as an insert part in the sleeve part 4, has an extraction cone in the form of a male Luer Lock 90. It extends coaxially within a sleeve part 89, the outside of which constitutes the peripheral part, to which the neck part 14 is formed. The Luer Lock 90 protruding beyond the end of the sleeve part 89 has a closure part 92 for closing its outlet opening, which is formed to the Luer Lock 90 over a predetermined breaking point 91. The closure part 92 has an axially protruding bar element 93, which is tightly enclosed by the overmold closure cap 16. In this way, a rigid connection is created, i.e. the closure part 92 can be safely taken off by means of releasing the predetermined breaking point 91 and the separation point 18 together with the overmold closure cap 16 by twisting off the latter using the rotary levers 82, 84 integrally formed thereon.
[0049] FIGS. 15 to 17 illustrate steps of the method according to the invention which enable a particularly high anti-microbial sealing effect to be obtained between the insert 8 and the container body 2 during manufacture of the container. In this respect, the procedure is such that the insert 8, in particular in the area of the ring 42 forming the sealing element, is heated to a temperature of at least 50 to 70 Celsius before the insertion into the seat 6 of the neck part 4 during the manufacture of the container according to the bottelpack process. In this way, the formation of the fusion bond during the closing of the head jaws 97 (FIGS. 18 to 20) is facilitated. FIGS. 15 to 17 illustrate the procedure. Immediately prior to insertion into the blow-molding device, the insert 8 is preheated by a heating device, which in FIGS. 15 and 16 is designed as a so-called heat reflector 94. FIG. 15 shows the state before contact with the heat reflector 94, while FIG. 16 illustrates the heating process. Preheating can be done by direct contact of the sealing element 42; 68 using a heated surface or by radiating heat, for instance using infrared rays or laser beams, or, if the insert 8 is made from correspondingly additized plastics, also by inductive coupling of an electromagnetic field. To promote the formation of the fusion bond, the insert 8 also can be composed of several different materials, e.g. produced by multicomponent injection molding. The sealing element 42; 68, for instance, may be formed from a thermoplastic polymer softening at low temperatures and having good adhesion properties to the polymer material of the container body 2, in particular a thermoplastic elastomer can be provided (TPE) for this purpose. The other parts of the insert 8 can be made of polymers having higher softening temperatures. In this way, a high dimensional stability of the insert 8 is ensured as well as a tight connection by melting, even at warming to higher temperatures. To achieve a particularly high microbiological tightness after being subjected to mechanical torsional stress, it is advantageous if the sealing element 42 is located outside the area of the circumferential surface irregularities 24, 26; 52; 54; 56; 58; 72 located on the insert 8, to prevent the torsional moments/forces, for instance during opening, from significantly affecting the sealing element 42.
[0050] FIGS. 18 to 20 show the manufacturing steps downstream of the heating process. FIG. 18 shows the insert 8 immediately before the insertion procedure. During the insertion, at first merely an axial pressure force is applied to the insert 8, to ensure a fusion bond, upon which radial forces are applied after a time delay by closing the head jaws 97, to achieve the interlocking between the surface irregularities of the peripheral region of the insert 8. A short delay of even less than one second between these operations has a particularly advantageous effect. FIG. 19 shows the state after the head jaws 97 have been closed, wherein the over-mold closure cap 16 is formed and sealed to produce the closed state of the container as shown in FIG. 20.
[0051] For the process of heating, the following temperature ranges have proven useful if suitable materials were used for the tube 98 forming the container and the insert 8 with sealing element 42; 68:
TABLE-US-00001 Container Material: Insert/Sealing Element Temperature Sealing LDPE LDPE/LDPE up to 95-120 C. LDPE HDPE/HDPE up to 130-145 C. PP PP/PP up to 150-170 C. PET PET/PET (amorphous) up to 70-100 C. PP PP/TPE up to 120-160 C.
