BE1028731A1 - MECHANICAL FASTENERS FOR RECORDING A VALVE HOUSING, PREFORM, CONTAINER AND AEROSOL INCLUDING THE MECHANICAL FASTENERS - Google Patents

Abstract

The present invention relates to mechanical fasteners for receiving a valve housing. The fasteners are provided on injection molded preforms and plastic containers, on the inner wall of the neck portion. The invention also relates to combinations of the preform or container, comprising the mechanical fastening means, with the valve housing. Furthermore, methods are provided for producing the aforementioned combinations and a core pin for production of the preform by injection molding. The invention also relates to the use of the aforementioned combinations for manufacturing aerosol cans.

Description

MECHANICAL FASTENERS FOR RECORDING A VALVE HOUSING, PREFORM, CONTAINER AND AEROSOL INCLUDING THE MECHANICAL FASTENERS

TECHNICAL FIELD The invention is situated in the field of hard plastic packaging, specifically in the field of plastic dispensers and aerosol cans. The invention is important for the large-scale and efficient production of plastic packaging. The invention relates to combinations of a valve housing with a preform or container for assembling an aerosol, the preforms for receiving the valve housing, production methods and uses.

BACKGROUND Aerosols are well known. A standard aerosol can comprises a container having a mouth to which a valve housing with a valve element is attached. The mounting must be able to withstand pressure and must not leak product.

Aerosol cans made of metal, tinplate or aluminum are widely used in practice. The valve housing is a stamped or bent sheet metal part. The plate surface of the valve housing is shaped like a dome which forms a receiving space for a valve element. The valve element and a seal are arranged in a receiving space. The valve housing with valve element are mounted in a metal container. The valve housing is fixed in the opening of the metal container by means of metalworking, also called crimping. The shrinking creates a positive connection between the valve housing and the container.

An alternative material for the container and/or valve housing is plastic. Because of different material properties, other solutions have to be found to obtain a connection between the container and the valve housing. Connection techniques described in the art include gluing, welding, screw connection, snap-fit connection, bayonet connection. Gluing and welding are difficult to perform on a large scale in a reproducible manner. For the other connections, numerous structures have been proposed in the art which are complex and add excessive weight.

It is important that the connection does not come loose or can be loosened, as with a screw connection. The connection must be secure when the aerosol is under pressure in use. Assembly of parts into a spray can should be simple. An additional problem with known valve housings is the lack of compatibility with standard caps. This stands in the way of acceptance by manufacturers and large-scale production of aerosol cans. For example, in US201503468, Figure 11 shows a plastic aerosol can comprising a plastic container and a plastic valve housing. The container mouth 17 is fitted in a groove 18 of the valve housing. A collar of the valve housing is heated and then folded over the container mouth along the outside. The combination in an aerosol with a lot of material use in the end. The folded edge adds extra thickness and makes the outer diameter larger. Chances are the outer diameter will not be compatible with standard caps. In Figure 20 a snap-fit connection is disclosed between a valve housing and plastic container. The proposed implementation is complex. The object of the invention is to provide a solution to at least one of the above-described problems.

SUMMARY OF THE INVENTION To this end, the invention provides a preform obtained by injection molding, according to claim 1.

The invention also provides a container obtainable from said preform in combination with a valve housing, according to claim 5. The invention also provides a method for manufacturing an injection molded preform according to an embodiment of the invention, as described in claim 12.

The invention also provides a method for manufacturing a container system according to an embodiment of the invention, as described in claim 14.

The invention further provides a mold core for injection molding an injection molded preform according to an embodiment of the invention as described in claim 13.

Finally, the invention provides a valve housing according to claim 17, which can be used advantageously in the invention.

SUMMARY OF THE FIGURES Figure 1A is a three-dimensional representation of an injection molded preform having elongate protrusions as a receptacle on the inner wall of the mold opening. Figure 1B is a cross-sectional view of the injection molding preform incorporating a metal cup-shaped valve housing with valve. Figure 1C is a schematic detail drawing of a cross-section through the neck wall of the injection molding preform. Figure 2A is a three dimensional representation of an injection molded preform having elongate protrusions as a receptacle on the inner wall of the mold opening. The protrusions continue up to the edge of the casting opening. Figure 2B is a cross-sectional view of the injection molding preform incorporating a metal cup-shaped valve housing with valve. Figure 2C is a schematic detail drawing of a cross-section through the neck wall of the injection molding preform. Figure 3A is a three-dimensional representation of an injection molded preform with star-shaped protrusions as a receptacle on the inner wall of the mold opening. Figure 3B is a cross-sectional view of the injection molding preform incorporating a cup-shaped valve housing with valve made of plastic. Figure 3C is a schematic detail drawing of a cross-section through the neck wall of the injection molding preform.

Figure 4A is a three-dimensional view of an injection molding preform with annular recess as a receiving means on the inner wall of the mold opening.

Figure 4B is a cross-sectional view of the injection molding preform incorporating a metal cup-shaped valve housing with valve.

Figure 5A is a three-dimensional view of a mold core injection molding apparatus. Figure 5B is a schematic representation of the same mold core injection molding apparatus.

Figure 6A is a three-dimensional view of a spray tube according to a preferred form of the invention. Figure 6B is a schematic representation of the same aerosol can.

DETAILED DESCRIPTION OF THE INVENTION Unless otherwise defined, all terms used in the description of the invention, including technical and scientific terms, have the meaning generally understood by one of ordinary skill in the art to which this invention pertains. Further, definitions of the terms are included to better understand the description of the present invention.

As used herein, the following terms have the following meanings: “A”, “the” and “the” as used herein refer to both the singular and the plural unless the context dictates otherwise. “A sub-fund” refers, by way of example, to one or more than one sub-fund.

"About" as used herein, referring to a measurable value such as a parameter, an amount, a duration, and the like, is intended to include variations of +/-20% or less, preferably +/-10% or less, more preferably +/-5% or less, even more preferably +/-1% or less, and even more preferably +/-0.1% or less of the specified value, insofar as such variations are suitable for to be carried out in the described invention. It will be understood, however, that the value to which the term "approximately" refers is itself specifically described. “Include”, “comprising” and “comprises” and “consisting of” as used herein are synonymous with “contain”, “containing” or “contains” and are inclusive or open terms specifying the presence of what follows e.g. a component and the presence of additional, not mentioned components, features, elements, parts, steps, which are well known in the art or described therein, and are not exclusive.

5 Citing numerical ranges by endpoints includes all numbers and fractions included within that range, as well as the named endpoints. The present invention relates to mechanical fasteners for receiving a valve housing. The mechanical fasteners are mounted on a preform or container intended for combination with the valve housing. The valve housing is preferably cup-shaped. The valve housing may be made of metal or plastic. The invention also relates to aerosols comprising a mechanical fastening means according to the invention.

In a first aspect, the invention provides preforms of a thermoplastic composition obtained by an injection molding process. The thermoplastic composition preferably comprises a polyester composition, preferably a polyethylene terephthalate (PET) or a polybutylene (PBT) composition. Alternative compositions are polyamide (PA), polyethylene (PE), polypropylene (PP). These injection molded or injection molded preforms are adapted to be subjected to a stretch blowing process to form a pressure-resistant container. The container must be pressure resistant to receive and retain a pressurized fluid. The wall thicknesses of the preforms are selected to leave after stretch blowing sufficient wall thickness to leave a rigid bottle capable of withstanding a selected pressure. The pressure in aerosol cans is preferably between 1.5 and 20 bar (0.15 to 2 MPa). The injection molding preform includes a bottom, a wall extending upwardly from the bottom in an elongated manner forming a shell portion and a neck portion subsequent to the shell portion. The neck portion is open at the end opposite the bottom and provides a pouring opening. The wall of the injection molding preform is provided with a thickening in the part surrounding the open end. The neck part comprising the annular wall ends in a thickened edge near the pouring opening. The injection molding preform preferably has no screw thread in the neck portion, neither on the outer wall nor on the inner wall of the neck portion. The neck portion of the preform is adapted to be combined with a cup-shaped valve housing. A container obtained from the preform by stretch blowing will retain the neck portion. After inserting a cup-shaped valve housing into the neck part and securing the valve housing to the neck part thereby closing the pouring opening, an aerosol can is formed. The valve can be accommodated in the valve housing before the housing is combined with the neck part or after accommodation of the valve housing in the neck part. To enable the valve housing received in the neck part to close off the pouring opening, the dimensions of the annular wall of the preform and the outer wall of the cup-shaped valve housing are matched. The annular wall is sized to accommodate the cup-shaped valve housing. The thickened edge is designed to provide a support for cup-shaped valve housing when received in the neck part. A preform according to an embodiment of the invention is characterized by the presence of a receiving means for mechanically fixing a cup-shaped valve housing inside the neck part. The annular wall of the preform is thereby provided along the inside, on the inner wall, with a receiving means which is rotationally symmetrical with respect to the longitudinal axis (I) of the injection molding preform.

The recording means can be implemented in various ways. The different embodiments have in common that a mechanical connection is obtained when the cup-shaped valve housing is inserted into the neck part.

In a first preferred embodiment, the recording means is provided by elongate protrusions. The longitudinal axis of the elongate protrusions is oriented parallel to the longitudinal axis of the injection molding preform. The elongate protrusions are located on the inner wall of the neck portion. They lie inside the annular neck part. From the inner wall of the neck portion they extend radially towards the longitudinal axis of the injection molding preform. The protrusions are sized to receive a press fit of the cup-shaped valve housing. When the cup-shaped valve housing is received in the annular neck portion, the elongate protrusions are depressed. Pressing the protrusions causes the valve housing to get stuck. The pouring opening is closed. A mechanical connection, also called an inner clinch, is created.

The elongate protrusions may start at the open end of the neck portion. The elongate protrusions can also start within the annular neck wall. Preferably, there are no elongate protrusions on the inner wall of the annular neck wall on the wall portion with a thickened rim around the pouring opening.

In an alternative preferred form, the receiving means is provided by elongate protrusions formed on an inner wall of the neck portion, the orientation of the elongate protrusions being parallel to the longitudinal axis of the injection molding preform, the protrusions extending radially within the annular neck portion toward the longitudinal axis of the die. the injection molded preform, and the protrusions are sized to form-fit the cup-shaped valve housing comprising on an outer surface of the cup-shaped valve housing projections of a shape complementary to said protrusions.

The dimensions of the elongate protrusions are preferably a length between 5 and 15 mm, a height between 0.1 and 1 mm, and a width between 0.2 and 2 mm.

In yet another preferred form, the receiving means is an annular recess in the annular wall of the neck portion. Preferably, the recess provides a curved surface. This embodiment is preferably used in combination with a metal valve housing comprising a pliable plate part. A pliable metal sheet member can be easily crimped to fit the annular recess.

The injection molding preform according to an embodiment of the invention is preferably an injection molding preform wherein the outer diameter of the aforementioned neck part of the injection molding preform and the container system, has a standardized outer diameter of between 10 mm and 100 mm, outer limits included. More preferably, the outer diameter is between 15 and 80 mm, even more preferably between 20 and 60 mm, most preferably between 25 and 10 mm. The invention also relates to a combination of a previously described preform with a valve housing. The valve housing preferably includes a base, an annular sidewall extending from the base thereby providing a cup.

The end of the cup opposite the base is open. This cup opening is preferably provided with a supporting edge. The valve housing is designed to accommodate a valve. Preferably, the valve is placed centrally in the valve housing.

In a second aspect, the invention provides containers obtained from the aforementioned preforms. These containers are obtained by stretch blowing of the above-mentioned preforms. In this case, the neck part of the preforms is taken over and the recording medium is retained.

The invention also relates to a combination of these containers with a valve housing. This container system is extremely suitable for assembly into aerosol cans.

In a second aspect, the invention provides a container system adapted for receiving and dispensing a fluid under pressure, the container system comprising in combination: a container of a thermoplastic composition obtained from an injection molded preform according to a preferred form of the invention, and comprising a valve housing a base, an annular side wall extending from the base thereby providing a cup, a cup opening with abutment rim, and a valve received in the cup adapted in use, for controlled dispensing of a fluid under pressure from said container; the container comprising a bottom, a wall formed by stretch blow molding a thermoplastic composition, the wall extending upwardly from the bottom in an elongated manner forming a container shell portion and an injection molded container neck portion subsequent to said container shell portion providing a pour opening; the injection molding container neck part is adapted to receive the cup-shaped valve housing with valve; the injection molded container neck portion comprising an annular wall leading to a thickened rim, the wall being dimensioned to receive the cup-shaped valve housing and the thickened rim providing a support for the cup-shaped valve housing when received in the neck part; and characterized in that the annular wall of the injection molding container neck part comprises a receiving means for mechanically fixing the cup-shaped valve housing within the injection molding container neck part and closing the mold opening, and the receiving means is formed rotationally symmetrical with respect to the longitudinal axis (I) of the injection molding preform.

Preferably, the combination of container and valve housing, wherein the valve housing is received in the neck portion of the container, provides an outer diameter in the neck portion of between 32 mm and 73 mm, inclusive outer limits. These dimensions are standard outer diameters that are commonly used in the packaging industry. It allows use of standard caps to cover a valve housing comprising a valve received in the neck portion of the container. This is advantageous for acceptance by aerosol manufacturers. It allows for large-scale industrial production.

The receiving means is preferably provided by elongate protrusions formed on an inner wall of the injection molding container neck portion, the orientation of elongate protrusions being parallel to the longitudinal axis of the container obtained by stretch blowing, the protrusions extending radially within the annular injection molding container neck portion toward the longitudinal axis of the stretch-blowing container, and the protrusions are sized to press-fit the cup-shaped valve housing in the annular injection molding container neck portion; wherein the cup-shaped valve housing is plastic or metal. The cup-shaped valve housing is preferably made of plastic.

In an alternative preferred form, the receiving means is provided by elongate protrusions formed on an inner wall of the injection molded container neck portion, the orientation of elongate protrusions being parallel to the longitudinal axis of the longitudinal axis of the container obtained by stretch blow molding, the protrusions extending radially within the annular shape. neck portion toward the longitudinal axis of the injection molding preform, and the protrusions are sized to form-fit the cup-shaped valve housing comprising on an outer surface of the cup-shaped valve housing projections of a shape complementary to said protrusions; wherein the cup-shaped valve housing is of metal or plastic. The cup-shaped valve housing is preferably made of plastic.

Said protrusions and protrusions for the form-fitting accommodation preferably form a tongue-groove combination. Said tongue-groove combination is preferably glued or welded.

In a preferred form of the container system of the invention, the receiving means is an annular recess in the annular wall of the injection molded container neck portion; wherein the cup-shaped valve housing is of deformable metal.

The container system according to an embodiment of the invention is preferably a container system wherein the outer diameter of the above-mentioned neck part of the container system has a standard outer diameter of between 10 mm and 100 mm, outer limits included. More preferably, the outer diameter is between 15 and 80 mm, even more preferably between 20 and 60 mm, most preferably between 25 and 10 mm.

In a further aspect, the invention provides a method of manufacturing an injection molded preform according to an embodiment of the invention, comprising the steps:

- providing a mold core adapted for production of injection molded preforms, the mold core comprising a bottom, a cylindrical body extending from the bottom and a zone for defining a neck portion following the cylindrical body, characterized in that elongate cuts are made arranged in said neck part of the mold core, the elongate cuts are parallel in length to the longitudinal axis of the mold core, the cuts are rotationally symmetrical with respect to the longitudinal axis (L) of the mold core.

The use of the above-mentioned adapted mold core is advantageous because the preforms have no undercut. The preforms can be easily demoulded. This production process can be carried out without using an injection mold with a sliding mould.

The invention also provides a mold core for injection molding an injection molded preform according to an embodiment of the invention, the mold core comprising a bottom, a cylindrical body extending from the bottom and a zone for defining a neck portion following the cylindrical body, characterized in that said neck part of the mold core comprises elongate incisions, the longitudinal axes of the elongate incisions are parallel to the longitudinal axis of the mold core, the incisions are oriented rotationally symmetrical with respect to the longitudinal axis (I) of the injection molding preform.

The cuts preferably have the following dimensions: a length between 5 and 15 mm, a depth between 0.1 and 1 mm and a width between 0.2 and 2 mm. These dimensions are advantageous for easily demoulding a preform formed on the mold core by injection molding.

The invention further provides a method for manufacturing a container system according to an embodiment of the invention, comprising the steps of: - providing a mold core adapted for production of injection molded preforms, the mold core comprising a bottom, a cylindrical body extending from the bottom and a zone for defining a neck portion following the cylindrical body,

- inserting the mold core into a mold thereby forming a mold for defining the injection molding preform, - filling the mold with a thermoplastic composition, thereby providing the injection molding preform, - demoulding the injection molding preform, characterized in that the region for defining the neck portion, thermoplastic material is extracted, thereby providing an annular recess sized to receive a cup-shaped metal valve housing; - Stretch blowing of the wall and bottom of the aforesaid modified preform, forming a plastic container, - Receiving the cup-shaped, metal or plastic valve housing in the neck portion of the container, obtained by stretch blowing, - Pressing the metal or plastic valve housing into the aforesaid annular recess thereby providing a mechanical connection of the metal valve housing to the plastic container.

Preferably, the valve housing is heated prior to compression.

This has the advantage that the valve housing can be deformed.

In a preferred embodiment of the method, protrusions are pressed.

In a final aspect, the invention provides a valve housing of plastic material comprising a base and an annular side wall extending from the base thereby providing a cup, the opening of the cup is provided with a support rim, and a valve received in the cup, wherein the valve and the valve housing being adapted, in use, to dispense a fluid under pressure in a controlled manner, the valve housing being sized for use within the neck portion of an injection molded preform or stretch blown container obtained from an injection molded preform, characterized in that on an outer surface of the annular sidewall star-shaped projections are provided for tongue groove reception in grooves provided on the aforementioned neck portion of an injection molding preform or in the neck portion of a stretch blown container obtained from an injection molding preform.

The supporting edge of the valve housing can be provided with a seal. The seal is preferably a thermoplastic elastomer, a silicone rubber or a rubber.

The invention is further illustrated by way of examples. These examples are not limiting.

EXAMPLES Legend Figures 1 injection molding preform 2 bottom 3 wall 4 neck part 5 pouring opening 6 cup-shaped valve housing 7 valve 8 annular neck wall 9 thickened rim 10 receptacle 11 elongated protrusion 12 annular recess 13 base valve housing 14 annular side wall housing 15 cup opening 16 abutment rim 17 inner wall 18 seal 19 protrusions 20 mold core or core pin 21 cut, groove 22 injection molding device 23 closing cap 24 bottom piece 25 plug

26 bottle 27 actuator 28 spring 29 dip tube 30 wall bottle 31 bottom mold core 32 jacket mold core 33 shoulder mold core 34 neck mold core 35 spray can | longitudinal axis preform L longitudinal axis mold core A first example of embodiments according to the invention is depicted in Figure 1. Figure 1A is a three-dimensional representation of an injection molded preform 1 with elongate protrusions 11 as receiving means. The elongate protrusions 11 sit on the inner wall 17 of the casting opening 5. The elongate protrusions 11 start below the thickened edge 9. The elongate protrusions 11 are parallel to the longitudinal axis | of the preform 1 oriented. They extend radially towards the longitudinal axis 1 of the preform. The preform 1 is obtained by injection molding without further processing steps. The preform 1 is equipped for the production of a bottle by stretch blowing the thermoplastic material from which the preform 1 is made. Figure 1B is a cross-sectional view of the injection molding preform 1 incorporating a metal cup-shaped valve housing 6 with valve 7. The elongate protrusions 11 are pushed in upon insertion of the valve housing 6 into the mold opening 5. The valve housing 6 is mechanically secured within the neck portion 4 The supporting edge 16 of the valve housing 6 can be provided with a seal

18. Figure 1C is a schematic detail drawing of a cross-section through the neck wall 3 of the injection molding preform 1. A second example of embodiments according to the invention is shown in Figure 2. Figure 2A is a three-dimensional representation of an injection molding preform 1 with elongate protrusions 11 ' as receiving means 10 on the inner wall 17 of the casting opening 5. The protrusions 11' continue up to the edge of the casting opening 5. The elongate protrusions 11' are parallel to the longitudinal axis | of the preform 1 oriented.

They extend radially towards the long axis | of the preform 1. Figure 2B is a cross-sectional view of the injection molding preform 1 incorporating a metal cup-shaped valve housing 5 with valve 7. Like the valve housing 5 in Figure 1B, this valve housing 5 also includes a base 13, an annular side wall 14 extending from the base 13 thereby providing a cup, and a cup opening 15 with abutment edge 16. Centrally in the cup, the longitudinal axis | Following from the preform 1, a valve 7 is accommodated in the valve housing 6. Figure 2C is a schematic detail drawing of a section through the neck wall 4 of the injection molding preform 1. Figure 3A is a three-dimensional representation of an injection molding preform 1 with star-shaped protrusions 11 ” as receiving means 10 on the inner wall 17 of the molding opening 5. Figure 3B is a cross-sectional view of the injection molding preform 1 with a cup-shaped valve housing 6 made of plastic material incorporated therein.

A valve 7 is received centrally in the cup-shaped valve housing 6 .

Figure 3C is a schematic detail drawing of a cross-section through the neck wall 3 of the injection molding preform 1 in which a cup-shaped valve housing 6 made of plastic is accommodated.

The valve housing 6 includes form-fitting star-shaped protrusions 19 on the upstanding outer wall of the cup-shaped valve housing 6. Figure 4A is a three-dimensional representation of an injection molding preform 1 with annular recess 12 as receiving means 10 on the inner wall 17 of the casting opening 5. The recess 12 was applied. in the inner wall 17 of the neck of the preform 1 after production of the preform 1. The preform 1 is provided for the production of bottles.

Figure 4B is a cross-section of the injection molding preform 1 including a metal cup-shaped valve housing 6 with valve 7. The metal cup-shaped valve housing 6 is deformable, at least in the upright wall part 14 of the cup-shaped valve housing 6. Due to deformation of the wall part after insertion of the valve housing in the neck portion of a bottle, the cup-shaped valve housing 6 is mechanically secured.

The mechanical fastening is an inner clinch.

The injection molding preforms according to an embodiment of the invention are advantageously produced with a mold core comprising elongate cuts oriented parallel to the longitudinal axis of the mold core and arranged in the neck portion of the mold core.

A synonym for mold core is mold pin.

A preferred form of mold core according to the invention is depicted in Figure 5. Figure 5A is a three-dimensional representation of an injection molding apparatus 22 with mold core 20. Figure 5B is a schematic representation of the same injection molding apparatus 22 with mold core 20. The mold core 20 includes a series of cuts 21, 21' which are evenly distributed over the neck 34.

The cuts are oriented parallel to each other.

The neck 34, shoulder 33, skirt 32 and bottom 31 provide the configuration of a preform 1 for a bottle 26. Figure 6 shows an aerosol 35 available with a preform 1 in combination with a cup-shaped valve housing 6 according to an embodiment of the invention .

Figure 6A is a three-dimensional representation, in front view, of the container system.

Figure 6B is a schematic representation of the same aerosol 35. An aerosol 35 according to the invention comprises a bottle 26 connected at the top and closed with a cup-shaped valve housing 6 according to the invention.

The bottle comprises a neck portion 4, a jacket 30 and a bottom.

The bottom can be a separate bottom piece 24. The bottom piece 24 can centrally comprise an opening which can be closed with a plug 25. This construction with plug 25, preferably a Nicholson plug, can be used for pressurizing filling material contained in the bottle.

The pressurization can, for example, take place by gassing with compressed air.

The cup-shaped housing 6 comprises a valve 7 with spring 28. The annular side wall 14 of the valve housing 6 abuts against the inner wall of the neck part 4.

The side edge of the cup 6 bears on the thickened edge 16 of the neck opening.

At the top of the valve 7 is an actuator for operating the valve 7. The actuator is closed with a cap 23.

Claims (17)

CONCLUSIONS An injection molding preform (1) of a thermoplastic composition, adapted to be subjected to stretch blowing to form a container for receiving a fluid under pressure, the injection molding preform (1) comprising a bottom (2), a tubular wall ( 3) extending upwardly from the bottom (2) in an elongated manner thereby forming a skirt portion and a neck portion (4) following the skirt portion providing a pour opening (5), the neck portion (4) adapted to receive a cup-shaped valve housing (6 ) comprising a valve (7) for controlled release of the fluid under pressure, the neck part (4) comprising an annular wall (8) leading to a thickened rim (9) near the pouring opening (5), the annular wall (8) being is dimensioned to receive the cup-shaped valve housing (6) and the thickened edge (9) provides a support for the cup-shaped valve housing (6) when received in the neck part (4), characterized in that the annular wall (8) has a receiving means part (10) comprises for mechanically fixing the cup-shaped valve housing (6) within the neck part (4) and closing the pouring opening (5), and the receiving means (10) is formed rotationally symmetrical with respect to the longitudinal axis (I) of the injection molding preform (1). The injection molding preform (1) according to claim 1, wherein the receiving means (10) is provided by elongate protrusions (11) provided on an inner wall (17) of the neck portion (4), the orientation of the elongate protrusions (11) is parallel. is on the longitudinal axis (I) of the injection molding preform (1), the protrusions (11) extend radially within the annular neck portion (4) towards the longitudinal axis (I) of the injection molding preform (1), and the protrusions (11 ) are dimensioned to receive the cup-shaped valve housing (6) in a press-fitting manner. The injection molding preform (1) according to claim 1, wherein the receiving means (10) is provided by elongate protrusions (11") provided on an inner wall (17) of the neck portion (4), the orientation of the elongate protrusions (11'). ) is parallel to the longitudinal axis (I) of the injection molding preform (1), the protrusions (11°) extend radially within the annular neck portion (4) toward the longitudinal axis (I) of the injection molding preform (1), and the protrusions (11") are sized to receive the mold-fitting form cup-shaped valve housing (6) comprising on an outer surface of the cup-shaped valve housing (6) protrusions of a shape complementary to said protrusions. The injection molding preform according to claim 1, wherein the receiving means is an annular recess (12) in the annular wall (8) of the neck portion (4). A container system (35) arranged for receiving and dispensing a fluid under pressure, the container system (35) comprising in combination: a container (26) of a thermoplastic composition obtained from an injection molded preform (1) according to any one of the claims 1 to 3, and a cup-shaped valve housing (6) comprising a base (13), an annular sidewall (14) extending from the base (13) thereby providing a cup, a cup opening (15) with abutment rim (16), and a valve (7) received in the cup adapted to dispense, in use, a fluid under pressure from said container (26) in a controlled manner; wherein the container (26) comprises a bottom (24), a wall (30) formed by stretch blowing a thermoplastic composition, the wall (30) extending upwardly from the bottom (24) in an elongated manner, including a container shell portion (30 ) forming and injection molding container neck portion (4) subsequent to said container shell portion (30) providing a molding opening; the injection molding container neck part (4) is adapted to receive the cup-shaped valve housing (6) with valve (7); the injection molded container neck part (4) comprising an annular wall (8) leading to a thickened edge (9), the wall being dimensioned for receiving the cup-shaped valve housing (6) and the thickened edge (9) providing support for the cup-shaped valve housing (6) when incorporated in the neck part (4); and characterized in that the annular wall (8) of the injection molding container neck part (4) comprises a receiving means (10) for mechanically fixing the cup-shaped valve housing (6) within the injection molding container neck part (4) and closing it of the molding opening (5), and the receiving means (10) is rotationally symmetrical with respect to the longitudinal axis (I) of the injection molding preform (1); and wherein the combination of the cup-shaped valve housing (6) received in the container (26), provides in the neck part (4) a standardized outer diameter for receiving a closing cap (23); the standard outer diameter being between 32 mm and 73 mm, including outer limits. The container system (35) according to claim 5, wherein the receiving means (10) is provided by elongate protrusions (11) provided on an inner wall (17) of the injection molded container neck portion (4), the orientation of elongate protrusions (11) is parallel to the longitudinal axis (I) of the stretch blow container (26), the protrusions (11) extend radially within the annular injection molding container neck portion (4) toward the longitudinal axis of the stretch blow container (26), and the protrusions (11) are sized to receive a press fit of the cup-shaped valve housing (6) in the annular injection molding container neck portion (4); wherein the cup-shaped valve housing (6) is made of plastic or metal. The container system (35) of claim 5, wherein the receiving means (10) is provided by elongate protrusions (11) provided on an inner wall of the injection molded container neck portion (4), the orientation of elongate protrusions (11") is parallel on the longitudinal axis (|) of the container obtained by stretch blow molding, the protrusions (11) extend radially within the annular neck portion (4) towards the longitudinal axis (I) of the injection molding preform (1), and the protrusions (11”) be dimensioned to receive form-fittingly the cup-shaped valve housing (6) comprising on an outer surface of the cup-shaped valve housing (6) projections (19) of a shape complementary to said protrusions (11); wherein the cup-shaped valve housing (6) is made of metal or plastic. The container system (35) of claim 7, wherein said protrusions (11") and projections (19) form a tongue-groove combination. The container system (35) according to claim 8, wherein the tongue-groove combination (11", 19) is glued or welded. The container system (35) according to claim 5, wherein the receiving means (10) is an annular recess (12) in the annular wall (8) of the injection molded container neck portion (4); wherein the cup-shaped valve housing (6) is of deformable metal. The injection molding preform (1) according to any one of claims 1 to 4 or the container system according to any one of claims 5 to 10, wherein the outer diameter of said neck portion (4) of the injection molding preform (1) and the container system is a standardized outer diameter is between 10 mm and 100 mm, including outer limits. A method of manufacturing an injection molded preform (1) according to any one of claims 1 to 3, comprising the steps of: - providing a mold core (20) adapted for production of injection molded preforms (1), the mold core comprising a bottom ( 31), a cylindrical body (32) extending from the bottom (31) and a zone for defining a neck portion (34) following the cylindrical body (32), characterized in that elongate cuts (21, 21 ”) are arranged in said neck portion (34) of the mold core (20), the elongate cuts (21, 21”) are parallel in length to the longitudinal axis (L) of the mold core (20), the cuts (21, 21”) are arranged rotationally symmetrically with respect to the longitudinal axis (I) of the injection molding preform (1). A mold core (20) for injection molding an injection molded preform (1) according to any one of claims 1 to 3, the mold core comprising a bottom (31), a cylindrical body (32) extending from the bottom (31) and a zone for defining a neck portion (34) subsequent to the cylindrical body (32), characterized in that said neck portion (34) of the mold core (20) comprises elongate cuts (21, 21"), the longitudinal axes of the elongate cuts are parallel to the longitudinal axis (L) of the mold core, the cuts (21, 21”) are oriented rotationally symmetrical with respect to the longitudinal axis (L) of the mold core (20). A method for manufacturing a container system (35) according to claim 10, comprising the steps of: - providing a mold core (20) adapted for production of injection molded preforms (1), the mold core comprising a bottom (31), a cylindrical body (32) extending from the bottom (31) and a zone for defining a neck portion (34) following the cylindrical body (32), - inserting the mold core (20) into a mold thereby forming a mold for defining the injection molding preform (1), - filling the mold with a thermoplastic composition, thereby providing the injection molding preform (1), - demoulding the injection molding preform (1), characterized in that from the zone for defining the neck portion (34), removing thermoplastic material and thereby providing an annular recess (12) sized to receive a cup-shaped, metal or plastic valve housing (6); - stretch blowing of the wall (32) and bottom (31) of said adapted preform (1), forming a plastic container (26), - receiving the cup-shaped, metal or plastic valve housing (6) in the neck part (4) of the container (26) obtained by stretch blowing, - pressing the metal or plastic valve housing (6) into the aforementioned annular recess (12) thereby providing a mechanical connection of the metal valve housing to the plastic container (26). A method according to claim 14, wherein said valve housing (6) is heated prior to compression. The method of claim 14, wherein elongate protrusions (11, 11") are depressed. A plastic valve housing (6) comprising a base (13) and an annular side wall (14) extending from the base (13) thereby providing a cup, the opening (15) of the cup being provided with a support rim (16) , and a valve (7) received in the cup, the valve (7) and the valve housing (6) being adapted to dispense a fluid under pressure in use, in a controlled manner, the valve housing (6) being dimensioned for use within in the neck portion (4) of an injection molding preform (1) or stretch blown container obtained from an injection molding preform (1), characterized in that on an outer surface of the annular side wall (14) star-shaped projections (19) for a tooth groove are provided accommodation in grooves between protrusions (11”) provided on the aforementioned neck portion (4) of an injection molding preform (1) or in the neck portion (4) of a stretch blown container obtained from an injection molding preform (1).