DE1942022A1 - One-piece spray head for aerosol container - Google Patents

Description

1842022

mpi, .- iN <;. hans w. orobntng

PATK VTAXWAI-T

ΒΤΚΙΚΗΤΗΛβΝΙ IT AUGUST 18, 1969

IAK I) EH ΚΛχίΟβΛΙ.Ι.ΚΚ) Ρ / A TEI. KFOV NB. 1 »7β1

Mr. Carl Gisbert S i e b e 1, 4 Düsseldorf, Petersenstrasse 8

My files: S 1 - 71 One-piece spray head for aerosol containers

The invention relates to a one-piece spray head for aerosol containers, which is on a dispensing valve of the Container can be placed and is provided with a passage and an outlet nozzle for a propellant-active substance mixture.

In addition to the liquid active substance to be sprayed, such aerosol containers contain propellant gas, the liquefied portion of which is mixed with the active substance and its portion still in the gas phase means the interior space not occupied by the liquid of the aerosol container. Such propellants include, for example, chlorofluorocarbons. In addition to the task of squeezing the active ingredient out of the aerosol container, they also have the purpose of breaking the liquid active ingredient into smaller liquid droplets by spontaneous evaporation as it emerges from the nozzle of the spray head and creating a so-called spray cone. The size of the droplets increases with increasing propellant gas content. Since the propellant gas is generally the most expensive part of the content of the

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Aerosol container represents, one strives to this to keep it as low as possible. A fuel gas reduction However, natural limits are set by the fact that, depending on the product and type of application, to achieve the op-, maximum spray effect a certain droplet size must not be exceeded.

The invention has set itself the task by a special design of the through-holes of the spray head a propellant gas reduction while maintaining the To enable the required droplet size, the spray head economically by injection molding in one Piece is to be made of plastic and does not require any additional effort compared to conventional spray heads.

The solution according to the invention is characterized in that the outlet nozzle is preceded by at least one zone of smaller and larger cross-section arranged alternately one behind the other in the direction of flow of the propellant-active ingredient mixture. This ensures that, due to the multiple expansion and compression processes, there is an increasing pre-expansion and homogenization of the GdS-liquid gas-liquid mixture before the final expansion when exiting the outlet nozzle of the spray head, which is the size of the area after the final expansion compared to conventional spray head arrangements further decrease nilft. '.- ■ - "-" ■■■ -. ^:

The longitudinal axes of the zone of larger cross-section and the Zone of smaller cross-section can be arranged coaxially be. Jeclfjcii can be a further improvement of the Achieve pre-expansion and homogenization effects by that the longitudinal axes of adjacent zones dressing egg; and · larger cross-section% against each other offset ühd / or {angled siwd? » Such a

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Setting and / or Abwinkelüng has the consequence that the Spray jet on the wall of the following zone larger cross-section, which thus forms a baffle and an additional radial movement of the gas liquid flow evokes. The radial movement of the gas-liquid flow can also be thereby significantly reinforce that the longitudinal axis of at least one zone of smaller cross-section at an angle to the longitudinal axis of a zone downstream in the direction of flow larger cross-sections and directed tangentially to this. If, therefore, too strong a radial movement gives the spray jet generated an opening angle that is too large would, can be used to dampen the radial movement, but while maintaining the intimate Homogenisiefungsvorgangs, a second zone of smaller cross-section can be provided, which is dimensioned so that the of these Both zones partially cancel out radial movements, but lead to an intensified, turbulent flow.

The inner surfaces of at least the zones are expedient larger cross-section at least in one axial direction, formed as surfaces of revolution. ·

According to another embodiment of the invention, there is also the possibility of changing the dimensions of each zone of larger cross section compared to a corresponding zone upstream in the direction of flow and the dimensions of each zone of smaller cross section compared to the corresponding zone of smaller cross section upstream in the direction of flow of the propellant active ingredient. Mixture to be dimensioned larger. In this way, the pre-expansion effect can be improved. ;, -. _t

Das QuerSchßMtsy ^ rliältniis ^^ between the _i ^ zone larger cross-section uödvdei ¹ zone smaller ^ μεΓέρηηΙίΐε should

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ORDINAL INSPECTED

be at least 1.5: 1

The zones of smaller and larger cross-section can when using a special demolding technique that is determined by the design of the injection mold, can be produced easily and without additional effort. Which solidified after the injection molding process Plastic shows as the deforming process immediately follows Reaching the solidification temperature of the plastic is made due to the remaining residual heat an elastic behavior, and furthermore, since the plastic molecules are not yet frozen, a so-called Resilience. If the plastic material in the Demoulding of the pin forming the zones of smaller and larger cross-section, the possibility of radial Dodging, for example in the form of a free annular space that is inevitably previously formed by the tool construction and that surrounds the zones of smaller and larger cross-sections is given, there are no permanent changes in shape of the molded part due to the plastic behavior described on. In this sense, according to the invention, the Use of a device in which one of the shape of at least one zone of larger cross-section and one zone A first tool corresponding to a smaller cross-section is arranged so as to be coaxially movable with respect to a second, »peculiar tool, which surrounds the first tool while leaving a radial distance.

A method for demolding a the spray head according to the invention corresponding plastic injection molding using the device mentioned, in which the sleeve-like tool is the first alone is removed from the molding before the tool forming the expansion chamber is pulled. This demoulding technique means that this is due to the high residual. heat of the molded part elastic behavior of the material

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exploited. The plastic material can by pulling off the sleeve-like tool when pulling of the tool forming the expansion chamber elastically evade radially outwards without permanent changes in shape occurring on the molded part due to the elastic behavior of the plastic.

In the drawing, the invention is illustrated using several exemplary embodiments. Show it:

Fig. 1 is a cross section through a one-piece Spray head with a larger or smaller zone upstream of the outlet nozzle Cross-section,

Fig. 2 shows a cross section through a spray head with several consecutive zones of smaller and larger cross-section, the overall dimensions of which increase in the direction of flow. are enlarged,

Fig. 3 shows a stage of the Ent moldings before gear of the tools from one of the spray head Fig. 1 corresponding injection molding, in cross section,

Fig. H shows the cross section of a spray head with a Zone of larger cross-section and one offset from the axis of the outlet nozzle Zone of smaller cross-section,

FIG. 5 shows an enlarged illustration of the zone of larger cross-section according to FIG.

6 shows a tool pin for producing a

Zone of larger cross-section according to Fig. T or S. with baffle,

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. ORKaINAL INSPECTED

FIG. T shows a section along line VIl-VII iff

• Fig. 6, .- ■ - "; ..-;

FIG. 5 shows a representation similar to FIG. 7 a flow line illustrating the radial component,

9 shows a further embodiment Tool pen,

Fig. 10 shows a cross section through a

a valve stem attached spray head bit of a zone of smaller cross-section angled approximately 90 degrees with respect to the outflow direction in front of a zone of larger cross-section _v

11 shows the arrangement of tools for producing the zone of greater cross section according to Fig. 10, in a partially broken away representation,

FIG. 12 shows the tools according to FIG. 11 in a view ■ it impact surface,

13 shows an arrangement of tool pins for the tangential arrangement of a zone smaller cross-section compared to a zone with larger cross-sections »

14 shows a section along line XIV-XIV in Fig. 13,

15 shows a tool arrangement for two cross-sections which are larger than that of a zone • tangentially angled zones of smaller cross-section,

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FIG. 16 shows a section along line XVI-XVI in FIG. 15,

17 shows a cross section through a tool arrangement with two coaxial zones of larger cross section and two tangential zones Zones of smaller cross-sections,

18 shows a spray head with two tangentially afoge • angled zones of smaller cross section and an additional zone with a larger cross section downstream in the spray direction and

19 shows a tool arrangement for producing a Spray head with angled, in a zone of larger cross-section entering zones smaller cross-section according to FIGS. 10 to 18.

Fig. 1 shows a spray head 20 with a recess 21 for a tubular valve stem, not shown a dispensing valve of an aerosol container. This stop 22 extends only approximately over half the cross-sectional plane of the recess 21, while a feed channel 23 is provided above it, which in the present case would be partially covered by the face of the tubular valve stem. The supply channel 23 is connected in the upper part by a zone of smaller cross section with a zone of larger cross section 25, which in an outlet nozzle 26 opens out. The zone of larger cross-section 25 is approximately circular in the plane of the drawing. This is also advantageous for a perpendicular to the The plane running through the drawing plane the case, so that the zone of larger cross-section would have a spherical shape. The outlet nozzle 26 is set back somewhat within a

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Mouth opening 27 of the spray head. A free ring roughness 28 essentially surrounds the zone of smaller cross-section 2 "*, the zone of larger cross-section 25 and the Outlet nozzle 26 is coaxial and, as will be explained below, is due to manufacturing reasons. The longitudinal axes of the zone of smaller cross-sections 2t and the exit "du" * 26 are arranged coaxially, with the The center of the zone of larger cross-section 25 lies on this common axis. Ee can be seen in the dad Zone of larger cross-section 25 a pre-expansion and homogenization effect of the propellant-active substance mixture with the aim of a smaller droplet size after final expansion is achieved.

In this »sense, an even higher efficiency can be achieved ait of a spray head 29 according to FIG. 2, in which identical parts are provided with the same reference numerals. It can be seen that again at right angles from the upper part of the supply channel 23 a zone smaller Cross section 30 branches off at right angles, which, as already in 1, is dimensioned to be smaller in cross section than a subsequent zone of larger cross section 31. This zone of larger cross-sections 31 are two further zones of larger size Cross-section 32 and 33 connected downstream, which are each connected by zones of smaller cross-sections 34, 35, while the zone of larger cross section 33 opens into an outlet nozzle 36. It can be seen that the zones of smaller cross-section 30, 34 and 35 as well as the Exit nozzle 36 have an increasingly larger diameter in the outflow direction. The same goes for that successively connected zones of larger cross-section 31, 32 and 33. The central longitudinal axes of the zones of smaller cross-section and the outlet nozzle and the centers of the Zones of larger cross-section lie on a common Axis.

Fig. 3 shows an injection mold 37 for a Spritζling

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■ A cross-section that is larger than the zone! 25 according to FIG. 1 forming pin 39 is fastened at its »rear end in a sliding block 40, which under the we · effect of a compression spring 41 is available. The compression spring 41 is mounted in a longitudinal bore 42 of a »second tool 43, which is also in a bore 44 the injection mold 37 is longitudinally displaceable · In the Drawing is the tool 43 already from the injection ling 38 has been removed, so that this is the free one Annular space. 28 leaves behind. Pen 39 can now be used be pulled out of the molding 38. There is elastic deformation of part 38m of the spray * lings instead, which is still warm from the injection process »so that the plastic molecules have not yet frozen are. As a result, the material still has a so-called resilience and can therefore assume its original position again after the pin 39 has been removed from the mold.

A spray head 45 according to FIG. 4 differs from that Spray head 20 according to FIG. 1 and the spray head 29 according to FIG. mainly in that a zone of smaller cross-sections 46, which in turn has a feed channel 23 with a zone of larger cross-section 47 connects, is offset from an outlet nozzle 48. The flow caused by this is shown in the enlarged view of Zone of larger cross section 47 shown in FIG. 5 by a flow arrow 49. The tangential entry of the Zone of smaller cross-section 46 into the zone of larger cross-section 47 leads to an additional vortex movement, since the lower curved surface at 47a acts as a deflecting baffle which directs the gas-liquid flow into the zone larger cross-section diverts, so a passage initially prevented by the outlet nozzle 48 for parts of the Gaa liquid flow »

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In #ig. 6 is "shown in ball pen 50, where additionally "in" baffle 51 is provided * on the the smaller * cross-section t S3 from the entering zone "Stepping" beam as shown in Fig. 7 * strikes and the axial movement of the Cas-liquid caitsstss one more each after the formation of this fly it adds very or less strong radial components, like a flow path 54 in Fig. I recognize UAt.

Another tool pin SS is shown in FIG. which evokes another font of a PralIfliehe SS "

In FIG. 10, a spray head is placed on a valve stem 58. A supply channel 59 is free but the free cross-section of the valve stem SI and opens over an upwardly directed zone of smaller cross-sections · 0 in the rear part of a zone with a larger cross-section 61, whose longitudinal axis is angled by approximately 90 degrees with respect to the longitudinal axis of the zone of smaller cross section 10. That Spray material is deflected in this way in the axial direction. The zone of larger cross-section S1 is elliptical Cross-section and opens coaxially into an outlet nozzle

The tool arrangement for producing such a spray head is shown in FIG. 11. A tool pin 63 has a Recess 6% into which a pin 6S of another tool 66 engages in the operating position.

In contrast, FIG. 12 inclines an additional baffle 67, which is acted upon by the liquid flow and this presses an additional radial movement.

In contrast, FIGS. 13 and 1 * 1 show a tangential one and with respect to the longitudinal axis of the zone of greater cross-section 90 degrees angled position of a pin 65a, so that as a result of the Sas liquid flow a radial movement according to FIG

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The arrow 68 in Fig. It is imposed.

In Figs. 15 and 16, a die assembly is shown, wherein a tool forms two entry zones small lower cross-section 69 and 70, the overall to two \ opposite sides parallel to each other and tangentially in a "of de tool part 71 larger to forming zone cross-sections enter and are angled about 90 degrees with respect to the longitudinal axis ta ». The two zones of smaller cross-section 69, 70 lie approximately in the same cross-sectional plane of the zone of larger cross-section and consequently generate opposing radial movements of the gas-liquid flow which, depending on the selected cross-sectional ratio of the two zones of smaller cross-section, completely or partially cancel each other out, however, the homogenization process maintain.

In FIG. 17, zones of smaller cross-section 72, 73 can be seen, those at the middle level in a zone of larger size Cross-section 7 "* ends and i" cross-section larger are than the corresponding zones in Fig. 16. The differences are therefore only of a technical nature.

18 shows a spray head 75, which is essentially from the arrangements according to FIGS. 15, 16 and 17 through a further zone of greater cross-section 79 ax straight » Flow differs. In addition, the spray head is also placed on a valve stem 58, the clear bore of the same finding its continuation in a supply channel 76. From this »supply channel run on two opposite sides entry zones of smaller cross-section 77, which correspond to the tools 69, 70 and 72, 73, respectively. One downstream of the two entry zones 77 The zone of larger cross section 28 is formed by an only slightly reduced zone 80 »it the zone of larger cross section 79

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and an outlet nozzle 81 coaxially connected. Here, too, the zones are of larger cross-section and smaller Cross-section surrounded by a free annular space 82, the elasticity of the surrounding zones Wall 75a allows when demolding the molded part.

A complete tool assembly for the production of a spray head with a zone of larger cross-section 19 shows with tangentially directed entry zones of smaller cross section. It's the tool 15, 16 and 17 according to the arrow shown vertically up and down and in the drawing in the operating position shown for spraying the spray head. The tool engages the tool pin 71, according to FIG shown arrow is horizontally movable back and forth. This tool pin 71 is guided longitudinally displaceably within a tool sleeve 83, the front, the Molded part facing part is designed accordingly to the free annular space to be produced. When demoulding first the tool 69 is removed from the molding, then the tool S3 up to a plate-shaped stop 84 of the tool pin 71 is retracted and only then is the tool pin 71 itself pulled out of the molding. As already described, this is the procedure because the wall surrounding the expansion chamber as a result of the outer free annular space produced and the elasticity present due to the heat of the plastic material yield without permanent change in shape when the tool pin 71 is subsequently pulled and deform back can"

The spray heads described show that the arrangement of the zones and their smaller cross-section Assignment to the zones with a larger cross-section designed in a certain way means a reduction in the number of zones used Propellant amount per aerosol container while maintaining the

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OftenfGlNAL INSPECTED

required droplet size is possible, with the production of a one-piece spray head by injection molding is in one piece made of plastic in an economical way.

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Claims (1)

18420 Patent and utility model registration "One-piece spray head" Oarl Gisbert Siebel, Düsseldorf ie. August 1969 My files S 1-71 Claims J One-piece spray head for aerosol canisters that extends to a dispensing valve of the container attachable and with a passage channel and an outlet nozzle for a propellant-active ingredient mixture is provided, thereby characterized in that the outlet nozzle (26, 36, 48, 62, 81) consists of at least one each in the direction of flow of the propellant-active substance mixture alternately one behind the other arranged zone smaller and larger Cross section (24, 25t 30,31, 32, 33, 34, 35f 46, 47; 60, 61 j 69, 70, 71? 72, 73, 74; 77, 78, 80, 79) upstream is. 2. Spray head according to claim 1, characterized in that the longitudinal axes of the zone of larger cross-section (25; 31, 32, 33 i 78, 79) and the zone of smaller cross-section (24; 30, 34, 35; 80) arranged coaxially are. 3. Spray head according to claim 1, characterized in that the longitudinal axes of adjacent zones are smaller and larger cross-sections (46, 47) are offset from one another. OBSQlNAL INSPECTED - 15 - 10981 η / π 16 J. .-. ί-Ή - ^lb - - 18μ2022 **. Spray head according to claim 1, characterized in that that the longitudinal axes of two adjacent zones of smaller and larger cross-section (60, 61; 69, 70, 71; 72, 73, 7U; 77, 78) form an angle. b. Spray head according to one of claims 1, 3 and 4, characterized in that the longitudinal axis of at least one zone of smaller cross-section (65a) in the Angle to the longitudinal axis of a zone with a larger cross-section downstream in the direction of flow (6 3) and is directed tangentially to this. 0. Spray head according to claim 5, characterized in that two zones of smaller cross-section (69, 70; 72, 73; 77) tangentially in a zone of larger cross-section (71; 71; 78) in the same Cross-sectional plane of the same merge. 7. Spray head according to one of claims 1 to 6, characterized characterized in that the dimensions of each zone of larger cross-section (31, 32, 33) compared to a corresponding zone (30, 34, 35) upstream in flow direction opposite a corresponding, in the direction of flow of the propellant-active substance mixture upstream zone and the dimensions each zone of smaller cross-section (30, 34, 3b) compared to cer in each case upstream in the direction of flow corresponding zone of smaller cross-section are dimensioned larger. 8. Spray head according to one of claims 1 to 7, characterized in that the inner surfaces at least of the zones of larger cross-section at least 109810/0161 - - BATH ORIGINAL 194 202 ?. are designed as surfaces of revolution in one axial direction. 9. Spray head according to one of claims 1 to 8, characterized characterized in that the aspect ratio between the zone of greater cross section and the zone of smaller cross section is at least 1.5: 1. 10. Device for producing a spray head according to one of claims 1 to 9 »characterized in that that one of the shape of at least one zone of larger cross-section and one zone smaller Cross-section corresponding first tool (29) to a second, sleeve-like tool (43) Is arranged coaxially movable, which while leaving a radial distance the first Surrounding tool. 11. Method for demolding one of the spray head plastic injection molding corresponding to claims 1 to j9 using a device according to claim 10, characterized in that the sleeve-like tool (43) is first removed alone from an injection molding (38) before the tool (39) corresponding to the zone of larger cross-section is pulled. ORIGINAL L e r s e i t e