HK1096285B - Bottle, in particular baby's bottle and production method therefor - Google Patents

Description

Feeding bottle, in particular baby feeding bottle, and method for the production thereof

The invention relates to a nursing bottle, in particular a baby bottle, having a bottle body housing which is open on both sides, wherein a bottom cap with an air inlet valve is attached to a bottom-side end region of the bottle body housing and a teat is attached to an end region on the opposite nipple side, the teat having a cylindrical section and a nipple which is connected to the cylindrical section via a lip contact region, and to a method for producing a bottle body housing which is open on both sides of a nursing bottle according to one of claims 1 to 28.

Such a baby bottle with a bottle body housing which is open on both sides is known from US 5,499,729 a 1. A feeding bottle with a cylindrical housing is disclosed, in which a cap for fixing a teat is screwed onto an open end. In the region of the oppositely situated base, a further base cap is provided for the clamped fastening of a membrane as an elastic valve element. A plurality of holes are provided in the film in a closed state when the film is in a relaxed state. The apertures are open to an air vent when a negative pressure is applied to the chamber. In this case, the base region of the baby bottle is designed to be relatively small, so that the valve element arranged in this base region can only have a relatively small surface area. The cylindrical housing is made of a polycarbonate material formed by means of a blow molding process, which is common for baby bottles.

Furthermore, a bottle body housing, in particular for a baby bottle, with two open ends is known from US 6,142,325 a, wherein a bottom cap with a valve element is screwed on to a bottom-side end section. However, a relatively small base surface and therefore only a relatively small valve element are used here, so that no air can enter the interior of the bottle even at relatively high pressure differences. The vial housing may be made of glass, polyester, polyamide, polyolefin, polycarbonate, and the like.

From US 6,053,342 a, a baby bottle is known in which a cylindrically curved angled bottle body housing open on both sides is used. In this case, too, the teat is fixed in an end region by means of a cover and a bottom cover with an elastic membrane provided with air passage openings is used in the area of the smaller bottom opposite the location in question, the membrane being connected to the bottom cover by at least one web. The bottle body shell with two open sides is made of polycarbonate by means of a blowing process.

From FR 647873 a, a baby bottle is also known which has a special nipple designed as one piece with the outer body of the bottle body. This special conical vial housing is designed with two open ends, a fastening ring being screwed onto the open end section with a base. To avoid corrosion, the bottom surface is preferably made of aluminum.

From US 4613050 a, a baby bottle with a conventional cup-shaped bottle body housing is also known, wherein a special air valve is provided in the region of the screw cap in order to let air into the baby bottle.

Feeding an infant with such a baby bottle has so far been significantly different from sucking milk on the mother's breast. A completely uniform milk drink can be achieved by sucking on the mother's breast almost exclusively the very soft nipple through the baby's tongue and palate and because at the same time no negative pressure (vacuum) is created in the mother's breast. Especially when the baby does not suck or sucks only slightly on its own (negative pressure), causing milk to enter the mouth and to be subsequently swallowed. This milk drinking is actually equivalent to drinking from a cup with an additional milking movement.

In the case of the known baby bottles, a negative pressure is produced in the bottle, which is to be overcome by the baby by sucking to form a stronger vacuum, in the very opposite way, as early as the first sucking. This sucking pattern thus results in the inhalation of air from the mouth and the swallowing of air. This air causes the mother and baby to experience extremely uncomfortable gastrointestinal cramps, which very many babies do. Furthermore, the suction element must be relatively rigid, so that it does not collapse on itself due to the negative pressure in the bottle and thus cannot drink milk. However, such rigid suckling elements do not actually allow milking (striping), so that the infant actually drinks milk and undesired air only by sucking (vacuum).

The invention is based on the object of providing a milk bottle of the type mentioned at the outset, by means of which the absorption of milk on the natural mother's breast is simulated as well as possible.

The above-mentioned object is achieved in a feeding bottle of the type mentioned at the outset in that the bottle body housing has a substantially conical shape which widens from a suction-side end region to a base-side end region thereof, and in that the wall thickness of the cylindrical section of the teat is greater than the wall thickness of the lip contact region and of the nipple of the teat.

Thus, by virtue of the substantially conical shape of the vial housing which tapers toward its bottom end region, a relatively large bottom valve can be used, by means of which pressure compensation can be achieved in the event of a slight pressure difference. Furthermore, since the cylindrical section of the teat has a greater wall thickness than the wall thickness of the teat and the lip contact area, it is possible to simulate particularly well a baby sucking on a natural mother's breast. By designing the teat with different wall thicknesses, a relatively stable attachment is obtained due to the cylindrical section with a greater wall thickness, which elastically bears the rest of the teat, i.e. the lip contact region and the nipple connected thereto, whereby the feeling of contact against the breast of a natural mother is reproduced to a large extent.

The large and sensitive air inlet valve according to the invention at the bottom does not actually create a negative pressure in the baby bottle, so that there is no danger of the teat collapsing. The teat is therefore designed to be thin in the region of the teat in the region of the lip contact, as a result of which milking is again achieved. That is, the baby can obtain milk from the bottle by a milking action without having to suck. Gastrointestinal cramping is prevented by this structural interaction of the bottom valve with the nipple.

Furthermore, on the basis of the relatively large underside, it is possible to clean the baby bottle in a simple manner without a bottle brush and thus to be excellently suitable for cleaning in a food processor.

In order to be able to close the two open ends of the nursing bottle in a simple manner, it is advantageous if the bottle body housing is provided on both sides of the open end with an end region having a thread for mounting a cap.

If a teat is fastened to the end region with the smaller diameter by means of a cover, in which case the teat flange can be clamped between the cover and the end face of the upper end region by screwing the cover onto the bottle body housing, the teat can advantageously be fastened in a simple and reliable manner to the region of the bottle body housing opposite the lower end region with the larger diameter.

As already explained above, it is advantageous if the bottom cover with an air inlet valve is screwed onto the bottom end region, since, owing to the conical design of the bottle housing, a relatively large valve area is provided, through which air can enter in the event of a slight pressure difference, as is often the case when a small baby sucks on a mother's breast.

It is advantageous in that a reliable admission of air through the air inlet valve of the bottom cover is achieved if a membrane is inserted into the bottom cover in order to form the air inlet valve, with a fastening flange of the bottom cover being clamped between the end face of the bottom end region and the bottom cover.

Although air access to the interior of the bottle has been achieved by a threaded connection between the bottle body housing and the bottom cap, air access is more facilitated if at least one air inlet is provided in the bottom cap.

With regard to a good blocking of the air entry through the threaded connection between the vial housing and the bottom cap when the membrane is in the closed position, it is advantageous if the membrane has a shape corresponding to the cup-shaped configuration of the bottom cap.

In order to form a membrane in the form of a shut-off valve, it is advantageous for the membrane to be circular.

In order to ensure pressure compensation when a slight pressure difference has occurred and thus to avoid a negative pressure in the bottle chamber, it is advantageous if the inner diameter of the membrane is at least 15mm, preferably approximately 30 mm.

With regard to achieving a good sealing effect by means of the (in particular circularly annular) membrane in the closed position, it is advantageous if the bottom cover is domed with a central projection.

When the inner end section of the annular membrane abuts against the central projection of the bottom cap, an annular sealing surface of the membrane in the sealed state is formed on the central projection, which is released by the membrane being lifted upwards when a negative pressure occurs in the baby bottle.

In order to reliably prevent liquid from inadvertently flowing out of the bottle and to maintain a slight residual vacuum in the bottle after sucking, it is advantageous to insert the membrane into the bottom cap under pretension.

Experiments have shown that a particularly good imitation of a natural mother's breast can be achieved if the cylindrical section has substantially a wall thickness of 2.00mm to 2.50mm, in particular a wall thickness of 2.25mm, and the nipple area in contact with the lips has substantially a wall thickness of 1.20mm to 1.50mm, in particular a wall thickness of 1.35 mm.

In addition, in order to facilitate the "milking" of the child at the teats, it is also advantageous if at least one area is provided in said lip contact area, which area has a smaller wall thickness than the wall thickness of the remaining lip contact area. At the same time, experiments have shown that it is particularly advantageous for the abovementioned "milking" of the infant that the region has essentially a wall thickness of 1.30mm to 1.60mm, in particular 1.45 mm.

If the region with the smaller wall thickness extends into the nipple, it is arranged in the entire contact area of the baby's mouth or his tongue, thereby further facilitating the child's milking. Here, it is appropriate that the region is substantially triangular as viewed in front elevation.

In order to avoid undesired compression or collapse of the teat in the region of smaller wall thickness, it is advantageous if the region of smaller wall thickness is reinforced by at least one reinforcing rib.

In order to avoid undesirable projections on the outer side of the teat in such a case, the reinforcing ribs in the region of the smaller wall thickness are preferably provided on the inner side of the teat.

In this case, it is particularly advantageous, in connection with the extension of the region with the smaller wall thickness into the teat, for the stiffening ribs to extend into the teat.

The nipple preferably has a generally oval cross-section, while the cylindrical section has a circular cross-section. The teat is thus only comfortably introduced into the mouth by the child in two defined positions, which also results in the region with the smaller wall thickness being able to be placed in a precisely defined position on the teat. It is also advantageous for two regions of smaller wall thickness to be provided at diametrically opposite locations. In addition, it is advantageous in conjunction with this that the two regions of smaller wall thickness are arranged in the region of the flatter lateral surface of the teat.

In order to achieve the best possible simulation of the mother's breast with regard to the surface properties, it is also advantageous if the outer nipple surface in the lip contact region or the outer suction surface of the nipple, in particular in the region of the smaller wall thickness, has at least in regions a higher surface roughness of at most approximately 100 μm, in particular at most 50 μm. In particular, experiments have shown that when a surface roughness of about 10 μm to 40 μm, preferably about 15 μm to 30 μm, is used, not only a visually soft and skin-like appearance is obtained, but in addition the nipple feels particularly similar to the mother's breast.

The teat is preferably used as an injection molded part, wherein the surface roughness of the teat can be produced by a corresponding roughness in an injection molding die. The roughened region can be produced, for example, by spark erosion or by chemical etching of the die face of an injection die.

It is also mentioned that a fundamental problem exists today that on the one hand it is an obligation for health reasons to feed the child and to breast feed it for infants within six months, and on the other hand the mother cannot always feed the child for 4-6 hours in many cases, because the mother is not in the vicinity of the child. Especially in the united states, mothers usually have returned to work 6 weeks after production.

The mother now attempts to aspirate milk with a breast pump and bottle the child during his absence. Today children actually have to repeatedly and alternately eat milk between a bottle nipple and the mother's breast every day, which is very common for most babies of several weeks. In most cases the mother must stop nursing and feed the child with manufactured food. This is absolutely undesirable from a medical point of view. Even the american doctor formally recommends that breastfeeding should be continued until the birth of one year, which is subject to significant technical problems, as mentioned above. Although attempts have been made to habituate a child to the same sucking performance or power as on a mother's breast through as small a suction orifice as possible on a bottle nipple, this has in most cases proved unsatisfactory. Not only the mouthfeel but also the viscosity of the latex or silicone nipple is completely different from what a child feels on a mother's breast. The way milk is sucked from a bottle nipple is also quite different from the milk drinking movement on the mother's breast.

By combining the surface design with respect to wall thickness variation, roughness and the special coordination of these features, which have already been discussed in detail here, with the described bottom-side inlet valve, a large step is now taken in the direction of the "mother's breast" and a substantially longer breastfeeding time for the mother is achieved.

The nipple is preferably made of a thermoplastic elastomer, latex, silicone or similar elastomeric material.

A method of the type mentioned at the beginning is characterized in that the vial housing is injection-molded or injection-molded from a polyolefin, in particular polypropylene.

Hitherto, primarily polycarbonate feeding bottles have been used, but these have the disadvantage that the material is relatively expensive and, in addition, the production by means of the stretch-blow moulding process is also relatively complicated.

Polypropylene feeding bottles blown from hollow bodies are on the other hand known. However, there is a disadvantage in that such a baby bottle cleaned by boiling after its use is contracted by about 5% due to a so-called Memory-effect (Memory-effect), so that the scale provided on the bottle body housing is distorted. In order to counteract this distortion, the baby bottle which has to be blown from the hollow body is stretched in a subsequent process step. In the production of a baby bottle from polyolefins, in particular polypropylene, by injection molding, a relatively economical bottle body shell for a baby bottle can thus be produced, which does not have to be worked up in a further subsequent step.

In order to obtain a large base surface and thus a large valve surface in a simple manner, it is advantageous if the bottle body housing is produced by means of a frustoconical injection molding in order to form the substantially conical bottle body housing. The removal of the vial housing from the injection mold is also facilitated by the frustoconical configuration of the injection mold, since the vial housing can be simply removed toward the smaller diameter of the injection mold.

In order to make the contents of the bottle visible, it is advantageous if the outer body of the bottle is injection-molded from transparent polypropylene, in particular from so-called Random-copolymer-polypropylene (PP), metallocene-catalyzed polypropylene (Metallocen-katalyrtem-Polypropylene) or the like.

The invention is explained in detail below with the aid of a preferred embodiment shown in the drawing. The invention is not limited to the embodiments presented. In the drawings:

FIG. 1 is a sectional view showing the baby bottle with a conical body case made of polypropylene;

FIG. 2 shows a perspective view of the bottom cover;

FIG. 3 shows a cross-sectional view of a membrane of a bottom side air intake valve;

FIG. 4 shows a perspective view of the bottom cap with the incorporated membrane;

FIG. 5 shows a perspective view of a nipple having a region of reduced wall thickness;

FIG. 6 shows a cross-sectional view taken along line VI-VI in FIG. 5; and

fig. 7 shows a cross-section according to the line VII-VII in fig. 5.

Fig. 1 shows a baby bottle 1 having a conical body housing 2 made of polypropylene, which is open in its two end regions and is provided with threads 5, 6 for fastening a cover 7 and a bottom cap 8.

Here, the vial housing 2 is made of a polypropylene material and is formed by means of an injection molding process, so that the conical shape of the vial housing 2 can be produced simply by means of conical injection molding. Wherein the demolding of the bottle housing 2 injection-molded from polypropylene is accomplished in a simple manner by pulling the bottle housing 2 out of a conical injection mold (not shown) in the direction of the smaller injection mold diameter.

A nipple 9 is fixed in the upper, smaller-diameter end region 3 by means of the cover 7, a nipple flange 10 being clamped for this purpose between the cover 7 and the end face 3' of the upper end region 3. In order to prevent liquid from flowing out of the bottle 1 when not in use, a protective cap 11 is attached to the cap 7, the protective cap 11 covering a liquid outflow hole 12 of the teat 9 in the position shown in fig. 1 by slightly pressing the teat 9 downwards when the protective cap 11 is in the mounted state (see fig. 5).

A bottom cap 8 with an air inlet valve 13 is screwed onto the bottom end region 4 of larger diameter by means of the thread 6. The air inlet valve 13 is composed essentially of the bottom cover 8 and a membrane 14 inserted into the bottom cover 8, as can be seen in particular from fig. 24. Wherein the dish-shaped bottom cover 8 is provided with an internal thread 15 for screw-coupling with the external thread 6 of the bottle body housing 2 and has a central protrusion 16 as a support surface for the thin film 14.

As can be seen in particular in fig. 2, a plurality of air inlet openings 18 are provided in the annular lower face 17 of the bottom cap 8, distributed along the circumference, so that pressure compensation is facilitated when suction causes a low pressure to occur inside the baby bottle 1, so that a slight pressure difference with the ambient pressure occurs. However, it is also possible to use an alternative design without air inlet openings 18, in which the air inlet is achieved only by the screw connections 6, 5.

As can be seen from fig. 3, the membrane 14 has a cup-like shape corresponding to the bottom cover 8 and is provided with a fixing flange 19, which fixing flange 19 is clamped between the bottom cover 8 and the end face 4' of the open end region 4 for fixing the membrane 14. For this purpose, the film 14 is designed in the form of a ring, with a sealing lip 20 in the inner end region, which is bent against the course of the film 14 adapted to the base cover 8.

As can be seen in particular from fig. 4, the membrane 14 is inserted into the bottom cap 8 with its sealing lip 20 pre-tensioned, so that a slight vacuum is maintained in the baby bottle 1 after sucking.

Thus, in order to achieve pressure equalization, air can enter through the air inlet opening 18 and the threaded connection gaps 6, 15 and subsequently reach the interior of the feeding bottle 1 by the sealing lip 20 being lifted from the central projection 16 of the bottom cap 8.

Fig. 5 to 7 also show in detail the nipple 9 visible in fig. 1, which interacts in particular with the bottom valve 13, which allows pressure compensation with only a slight pressure difference, in order to achieve a baby sucking or milking (straining), which closely simulates the sucking on the mother's chest.

For this purpose, the cylindrical section 21 of the teat 9 has a greater wall thickness than a lip contact region 22 connected thereto and a nipple 23 adjoining the lip contact region. This results in a spring force of the cylindrical section 21 acting in the direction of the arrow 24, the cylindrical section 21 carrying the lip contact region 22 with a smaller wall thickness and the nipple 23.

To further facilitate the milking (straining) of the baby and to simulate sucking on the mother's chest, the lip contact area 22 is provided with two areas 25 having a further reduced wall thickness compared to the remaining lip contact areas, as can be seen in particular from fig. 7.

The cylindrical section 21 of the teat 9 is designed in a rotationally symmetrical manner, i.e. circular in cross section, but the nipple 23 is oval in cross section, so that a small baby can comfortably insert the nipple 23 into the mouth in only two positions, specifically with the long axis extending transversely. The cross-sectional shape in the lip contact area 22 transitions from the oval cross-section of the nipple 23 to the circular cross-section of the cylindrical section 21, whereby the nipple shape is as close as possible to the natural nipple shape of a baby sucking or sucking on the mother's nipple.

The two regions 25 with the smaller wall thickness are arranged directly opposite one another on both broad sides of the teat 9, i.e. on both sides running parallel to the long axis of the oval cross-section of the teat 23, and are designed in front view as substantially triangular, and the two regions 25 extend with their broad base side region in the lip contact region 22 and with their narrow tip region up to the teat 23.

Four reinforcing ribs 26 are provided on the inside of each region 25 in order to increase the strength of the teat 9, in particular in the region of smaller wall thickness, so that even when soft material is introduced, the teat 9 is not undesirably pressed hard inwards in the lip contact region 22. Thus, the teat is reliably prevented from collapsing by the individual reinforcing ribs 26, and thus the possible blockage of the beverage, in particular of the milk, as a result of a delayed flow is reliably prevented.

Furthermore, the surface of the teat 9 has a higher surface roughness in the lip contact area 22 and at the nipple 23 than in other areas of the teat 9, so that the characteristics of the mother's breast can be better simulated. In the case of the teat shown in fig. 5 to 7, a region 27 surrounded by the outer contour 27' has a greater surface roughness of at most approximately 100 μm, in particular at most 50 μm, while experiments have shown that an optimum roughness of between 10 μm and 40 μm, preferably between 15 μm and 30 μm, is particularly well accepted by small infants.

The baby bottle according to the invention thus creates for the first time an economical and simple-to-manufacture baby bottle with a bottom valve which enables pressure compensation in the presence of slight pressure differences, wherein the use of the baby bottle according to the invention enables particularly good simulation of milk taking on the mother's breast by means of the pressure compensation in the presence of slight pressure differences in cooperation with a teat which can simulate the mother's breast particularly well on account of different wall thicknesses.

Claims (37)

1. An infant feeding bottle having a bottle body casing (2) with two side openings, wherein a bottom cap (8) with an air inlet valve (13) is fixed to a bottom side end region (4) of the bottle body casing (2) and a nipple (9) is fixed to an end region on the nipple side located opposite thereto, the nipple having a cylindrical section (21) and a nipple (23) connected thereto through a lip contact region (22), characterized in that: the bottle body housing (2) has a substantially conical shape which tapers from a suction-side end region to a bottom-side end region (4) thereof, and the wall thickness of the cylindrical section (21) of the teat (9) is greater than the wall thickness of the lip contact region (22) and the nipple (23) of the teat.

2. The baby bottle of claim 1 wherein: a suction-side end region (3) having a thread (5) for attaching a cover (7) and a bottom-side end region (4) having a thread (6) for attaching a bottom cap (8) are respectively connected to both open ends of the vial housing (2).

3. The baby bottle of claim 2 wherein: a teat (9) is fixed to the suction-side end region (3) having the smaller diameter by means of the cover (7), wherein a teat flange (10) is clamped between the cover (7) and an end face (3') of the suction-side end region (3) by screwing the cover (7) to the bottle body housing (2).

4. A baby bottle as claimed in claim 2 or 3, wherein: a bottom cap (8) with an air inlet valve (13) is screwed onto the bottom end region (4) of the vial housing (2).

5. The baby bottle of claim 1 wherein: in order to form the intake valve (13), a membrane (14) is inserted into the bottom cover (8), wherein a fastening flange (19) of the membrane (14) is clamped between an end face (4') of the bottom end region (4) and the bottom cover (8).

6. The baby bottle of claim 1 wherein: at least one air inlet hole (18) is arranged in the bottom cover (8).

7. The baby bottle of claim 5 wherein: the membrane (14) has a shape corresponding to the cup-shaped configuration of the bottom cap (8).

8. The baby bottle of claim 5 wherein: the membrane (14) is circular.

9. The baby bottle of claim 8 wherein: the inner diameter of the membrane (14) is at least 15 mm.

10. The baby bottle of claim 8 wherein: the inner diameter of the membrane (14) is 30 mm.

11. The baby bottle according to claim 8 or 9, wherein: the bottom cover (8) is formed with a central projection (16) in a dome-shaped manner.

12. The baby bottle of claim 11 wherein: the inner end section (20) of the annular membrane (14) rests against a central projection (16) of the bottom cover (8).

13. The baby bottle of claim 5 wherein: the film (14) is inserted into the bottom cover (8) under pretension.

14. The baby bottle of claim 1 wherein: the cylindrical section (21) has a wall thickness of 2.00mm to 2.50mm, and the nipple (23) and the lip contact area (22) has a wall thickness of 1.20mm to 1.50 mm.

15. The baby bottle of claim 14 wherein: the cylindrical section (21) has a wall thickness of 2.25mm, and the nipple (23) or the lip contact region (22) has a wall thickness of 1.35 mm.

16. The baby bottle of claim 1 wherein: at least one region (25) is provided in the lip contact region (22), the wall thickness of which is smaller than the wall thickness of the remaining lip contact region.

17. The baby bottle of claim 16 wherein: the region (25) having the smaller wall thickness has a wall thickness of 1.30mm to 1.60 mm.

18. The baby bottle of claim 16 wherein: the region (25) with the smaller wall thickness has a wall thickness of 1.45 mm.

19. The baby bottle of claim 16 wherein: the region (25) with the smaller wall thickness extends into the nipple (23).

20. The baby bottle of claim 19 wherein: the region (25) of lesser wall thickness is generally triangular in front view.

21. The baby bottle of claim 16 wherein: the region (25) with the smaller wall thickness is reinforced by at least one reinforcing rib (26).

22. The baby bottle of claim 21 wherein: reinforcing ribs (26) in the region (25) of smaller wall thickness are provided on the inner side of the teat (9).

23. The baby bottle of claim 21 or 22, wherein: the reinforcing ribs (26) extend all the way into the nipple (23).

24. The baby bottle of claim 1 wherein: the nipple (23) has a substantially oval cross-section, while the cylindrical section (21) has a circular cross-section.

25. The baby bottle of claim 16 wherein: two diametrically opposed regions (25) of smaller wall thickness are provided.

26. The baby bottle of claim 25 wherein: the two regions (25) of smaller wall thickness are arranged in the region of the flatter lateral surface of the teat (9).

27. The baby bottle of claim 16 wherein: the outer nipple surface or the outer suction surface of the nipple (23) in the lip contact region (22) has, at least in regions, a higher surface roughness of at most 100 [ mu ] m.

28. The baby bottle of claim 27 wherein: the region (25) with the smaller wall thickness has a higher surface roughness.

29. The baby bottle of claim 27 or 28, wherein: a higher surface roughness of maximum 50 μm is used.

30. The baby bottle of claim 27 wherein: a surface roughness of about 10 to 40 μm is used.

31. The baby bottle of claim 30 wherein: a surface roughness of 15 μm to 30 μm is used.

32. The baby bottle of claim 1 wherein: the nipple (9) is an injection-molded part.

33. The baby bottle of claim 32 wherein: the teat (9) is made of a thermoplastic elastomer material.

34. The baby bottle of claim 32 wherein: the nipple (9) is made of latex and silicone.

35. A method of manufacturing a body casing (2) for both side openings of an infant nursing bottle according to claim 1, wherein: in order to form a substantially conical bottle body shell (2), the bottle body shell (2) is produced by means of a frustoconical injection molding and the bottle body shell (2) is injection molded from a polyolefin.

36. The method of claim 35, wherein: the bottle body shell (2) is formed by injection molding of polypropylene.

37. A method as claimed in claim 35 or 36, wherein: the bottle body shell (2) is formed by injection molding of transparent polypropylene random copolymer or metallocene catalyzed polypropylene.