US20140061244A1 - Method for producing a container for a bulk product - Google Patents

Method for producing a container for a bulk product Download PDF

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Publication number
US20140061244A1
US20140061244A1 US13/985,309 US201213985309A US2014061244A1 US 20140061244 A1 US20140061244 A1 US 20140061244A1 US 201213985309 A US201213985309 A US 201213985309A US 2014061244 A1 US2014061244 A1 US 2014061244A1
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US
United States
Prior art keywords
force
generating body
housing
wall portion
filling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/985,309
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English (en)
Inventor
Peter Kertels
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NOAFLEX GmbH
Original Assignee
NOAFLEX GmbH
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Filing date
Publication date
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Assigned to NOAFLEX GmbH reassignment NOAFLEX GmbH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KERTELS, PETER
Publication of US20140061244A1 publication Critical patent/US20140061244A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0055—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents
    • B65D83/0061—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents the contents of a flexible bag being expelled by the contracting forces inherent in the bag or a sleeve fitting snugly around the bag
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/42—Filling or charging means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B3/02—Machines characterised by the incorporation of means for making the containers or receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B3/04—Methods of, or means for, filling the material into the containers or receptacles
    • B65B3/10—Methods of, or means for, filling the material into the containers or receptacles by application of pressure to material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/60—Contents and propellant separated
    • B65D83/62—Contents and propellant separated by membrane, bag, or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49885—Assembling or joining with coating before or during assembling

Definitions

  • the invention relates to a method for manufacturing a container for a filling product, wherein the container comprises a housing and a rubber-like force-generating body projecting into the housing and having a longitudinal axis and a filling space for receiving the filling product, wherein the force-generating body has a closed first longitudinal end and is suspended relative to the housing in the region of an opposite second longitudinal end, wherein the force-generating body, when being filled, expands radially and axially in the housing—with respect to the longitudinal axis.
  • the elastic expansibility of the force-generating body can be utilized for generating a dispensing force which results from the tensile stress of the force-generating body and which is capable of forcing the filling product out of said body.
  • the filling product may be, for example, a liquid, pasty, cream-like or gel-like substance which is intended to be dispensed in a metered manner by means of the container.
  • the container may be equipped with a valve system that can be actuated by the user.
  • the dispensing force acting, in total, on the filling product results solely from the tensile stress of the force-generating body, i.e. it is possible to do without additional force-generating means in the form of a propellent gas or separate spring elements.
  • additional force-generating means may be provided as a supporting measure if desired, although at least the predominant part of the dispensing force which is available in total advantageously results from the tensile stress of the force-generating body.
  • the starting point of the invention is a design of the housing and of the force-generating body such that, when being filled, said body expands radially and axially in the housing—with respect to the longitudinal axis—in such a way that, upon reaching a partial filling state, it abuts, particularly at a distance from the second longitudinal end, on a first wall portion of the housing that limits the expansion radially and, upon continued filling, the first longitudinal end approaches a second wall portion of the housing that limits the expansion axially with increasing axial enlargement of the area of abutment of the force-generating body on the first wall portion.
  • the invention provides a method for manufacturing a container for a filling product according to claim 1 .
  • the container comprises a housing and a rubber-like force-generating body projecting into the housing and having a longitudinal axis and a filling space for receiving the filling product, wherein the force-generating body has a closed first longitudinal end and is suspended relative to the housing in the region of an opposite second longitudinal end.
  • the force-generating body When being filled, the force-generating body expands radially and axially in the housing—with respect to the longitudinal axis—in such a manner that, upon reaching a partial filling state, it abuts, particularly at a distance from the second longitudinal end, on a first wall portion of the housing that limits the expansion radially and, upon continued filling, the first longitudinal end approaches a second wall portion of the housing that limits the expansion axially, with increasing axial enlargement of the area of abutment of the force-generating body on the first wall portion.
  • the method is distinguished by the fact that, prior to the filling of the force-generating body, at least a part of the first wall portion is subjected to a friction-reducing surface treatment on the inside of the housing and/or at least a part of the force-generating body is subjected to a friction-reducing surface treatment on the outside.
  • the surface treatment may comprise the application of a friction-reducing substance to the first wall portion and/or the force-generating body.
  • the surface treatment may comprise fluorination of the first wall portion and/or of the force-generating body.
  • a friction-reducing substance it is preferable to provide at least the first wall portion of the housing with such a friction-reducing substance.
  • a friction-reducing substance at least additionally, to the outer surface of the force-generating body should not be excluded. Since, however, the thickness of the layer of the substance applied becomes smaller as the expansion of the force-generating body increases (the same quantity of the substance has to be distributed over a surface that is constantly becoming larger), exclusive moistening of the force-generating body with the friction-reducing substance (without also applying such a substance to the housing at the same time) is regarded as not being preferred, even though not excluded in principle.
  • the reduced friction between the force-generating body and the housing resulting from the surface treatment allows better slipping of the force-generating body on the first wall portion of the housing, and thereby facilitates the axial expansion of said force-generating body, minimizes axial force peaks of the latter on other components of the container and evens out the stresses in the material of said force-generating body. It has proved to be the case that, in this way, it is even possible to achieve shorter axial dimensioning of the force-generating body and to thereby reduce the input of material for each force-generating body manufactured, a fact which, in spite of the additional outlay for the surface treatment, can nevertheless lead to relevant cost savings overall in the context of mass production.
  • the friction-reducing substance use may be made, for example, of a water-based lubricant or even, in the simplest case, plain water.
  • a water-based lubricant of this kind may contain, for example, glycerine as an additional constituent.
  • the friction-reducing substance may, with time, evaporate partly or even substantially completely, although the friction, which is then increased again, between the force-generating body and the housing for the purpose of emptying said force-generating body will, as a rule, not have any disadvantageous effect, above all in view of the slowness with which emptying usually takes place, compared with the filling operation.
  • the application of the friction-reducing substance may be carried out, for example, by spraying, immersion, centrifuging or brushing on.
  • the friction partners i.e. the housing and the force-generating body
  • application of the friction-reducing substance may also be carried out by means of a roller or a brush, for example, or in an immersion process, instead of atomizing it.
  • the surface treatment may be restricted to those wall portions of the housing at which it is actually possible for expansion-induced, in particular axial, slipping of the force-generating body to occur.
  • a silicone rubber preferably an addition-cross-linking silicone rubber (particularly a liquid silicone rubber) is recommended for the force-generating body, although other elastomers (polyurethane, for instance) should not be excluded.
  • a silicone-free and mineral oil-free lubricant should be used as the friction-reducing substance, above all in the case of a silicone-based force-generating body.
  • Said friction-reducing substance may be a lubricant which can be wiped off and which does not adhere, even though the application of an adhesive lubricant, at least to the inside of the housing, is not excluded within the scope of the invention.
  • a friction-reducing surface treatment is advisable, above all in the case of pairs of materials having comparatively high reciprocal friction.
  • a comparatively high friction with the force-generating body can be identified, especially if the latter is manufactured from a silicone rubber.
  • Other plastics, too, may exhibit comparatively high friction in relation to the surface of a silicone rubber body.
  • the invention is in no way restricted to housings made of PE (polyethylene) or PP (polypropylene).
  • a durable friction-reducing layer of this kind may, for example, be formed by a non-evaporating lubricant which may then form a permanent barrier layer between the PMMA or PET material of the housing and the material of the force-generating body.
  • the background is that numerous substances may tend to “dry-bond” with self-adhesive silicone (materials made of a liquid silicone rubber, for example, exhibit a self-adhesive property of this kind).
  • the shape of the housing may be, for example, bottle-like or can-like; that being the case, it may be, for example, approximately cylindrical or have regions of different diameter, for instance after the manner of a conical shape or with a more complex diametrical profile.
  • the housing is longer than it is wide, under which circumstances the force-generating body is arranged in the housing with its longitudinal axis along the longitudinal extension of the latter.
  • the first wall portion of the housing may have at least one, for example groove-like, recess on its wall surface on the inner side of the housing in the area of abutment of the force-generating body.
  • a recess of this kind may be used for preventing, in a defined manner, the slipping movement of the force-generating body on the first wall portion.
  • Said recess represents a local enlargement in diameter, at which the force-generating body is able to expand to a greater extent radially. Said force-generating body is therefore able to expand into the recess and, so to speak, “interlock” in the recess.
  • the expansion of the force-generating body into the recess may stop, or at least reduce, the slipping movement of the force-generating body locally, even if the friction-reducing surface treatment extends onto the region of the recess.
  • the expansion behaviour of the force-generating body is preferably such that the latter does not abut axially on the second wall portion of the housing before reaching an infeed volume which is at least 1.5 times, better at least 2 times, better still at least 2.5 times and preferably at least 2.8 times an infeed volume above which the force-generating body abuts radially on the first wall portion of the housing.
  • the expansion behaviour of the force-generating body may be such that the latter abuts radially on the first wall portion of the housing before reaching a degree of filling of 5 0 %, better 45%, better still 40% and preferably 35% of an indicated nominal filling volume of the container.
  • the nominal filling volume may, for example, correspond to a filling specification which is attached to the outside of the container and is directed at the purchaser or user. This may, for example, be printed on or stamped in or otherwise moulded in.
  • the expansion behaviour of the force-generating body may be such that the latter abuts radially on the first wall portion of the housing before reaching a degree of filling of 45%, better 40%, better still 35% and preferably 30% of the empty volume of said housing.
  • the expansion behaviour of the force-generating body may be such that, when being filled, the latter does not abut axially on the second wall portion of the housing before reaching a degree of filling of 75%, better 80%, better still 85% and preferably 90% of a specified nominal filling volume of the container.
  • the expansion behaviour of the force-generating body may be such that, when being filled, the latter does not abut axially on the second wall portion of the housing before reaching a degree of filling of 60%, better 65%, better still 70% and preferably 75% of the empty volume of said housing.
  • the force-generating body is permitted a filling-induced axial elongation to at least 1.6 times, better at least 1.7 times and better still at least 1.8 times its axial length in the unfilled state, without said force-generating body impinging axially against the housing with its closed end.
  • This permits expansion behaviour of the force-generating body in which the latter expands axially, when being filled with a nominal filling volume which is specified for the container, to at least 1.6 times, better at least 1.7 times and better still at least 1.8 times its axial length in the unfilled state.
  • the force-generating body has an aperture in the region of its second longitudinal end and is connected, in this region, to a relatively rigid, annular connecting body which, in turn, is connected to at least one other container component, in particular at least one component of the housing, in the course of assembly of the container.
  • the force-generating body may be manufactured by injection technology and injection-moulded onto the connecting body.
  • the invention provides a container for a filling product, wherein said container comprises a housing and a rubber-like force-generating body projecting into the housing and having a longitudinal axis and a filling space for receiving the filling product, wherein the force-generating body has a closed first longitudinal end and is suspended relative to the housing in the region of an opposite second longitudinal end, wherein, when being filled, the force-generating body expands radially and axially in the housing—with respect to the longitudinal axis—in such a manner that, upon reaching a partial filling state, it abuts, particularly at a distance from the second longitudinal end, on a first wall portion of the housing that limits the expansion radially and, upon continued filling, the first longitudinal end approaches a second wall portion of the housing that limits the expansion axially, with increasing axial enlargement of the area of abutment of the force-generating body on the first wall portion.
  • the latter performs, at least in parts, a slipping movement on the first wall portion, wherein, for the purpose of influencing in a defined manner, and optionally preventing, the said slipping movement, the first wall portion has one or more, for example groove-like, recesses on its wall surface on the inner side of the housing in the area of abutment of the force-generating body.
  • Said first wall portion may, for example, be designed with at least one groove-like recess which extends, in the peripheral direction of the housing, over the entire periphery, or only part of the periphery, of the latter.
  • FIG. 1 represents an axial longitudinal section through a container constructed as a fire-extinguisher according to one embodiment
  • FIG. 2 represents a spray head of the container in FIG. 1 in an enlarged view
  • FIGS. 3 a to 3 e represent axial sections through the container in FIG. 1 (leaving out a valve assembly) in various phases in the filling of a force-generating body;
  • FIG. 4 represents an exemplary diagram for graphically illustrating an operation for filling the container in FIG. 1 ;
  • FIG. 5 represents, diagrammatically, a phase in the process for manufacturing the container in FIG. 1 , wherein a housing belonging to the container is sprayed on the inside with a lubricant in this phase.
  • the container shown therein which is designated by 10 , is configured, by way of an example, as a manually portable fire-extinguisher, although other forms of use, for instance as a dispenser for cosmetics, foodstuffs or technical substances, such as lubricants for example, are equally possible.
  • the container 10 serves for the storage and metered delivery of a filling product, under which circumstances the outer design of the container may be, for example, bottle-like or can-like (with a cylindrical or barrel-shaped basic shape, for example) or may assume any other desired shapes.
  • the container 10 has a housing 12 which is produced from polyethylene or polypropylene, for example, and has a housing axis 14 , a generally cylindrical jacket part 16 which encloses said axis 14 and a bottom part 18 which adjoins said jacket part 16 and closes the housing 12 axially on the underside.
  • the jacket part 16 of the housing 12 extends radially inwards and forms a housing neck 20 with a housing aperture 22 .
  • a rubber-like force-generating body 24 which projects into the interior space, which is designated by 26 , of the housing 12 .
  • said force-generating body 24 is of elongated design, after the manner of a condom, and has a longitudinal axis 28 .
  • the filling space 30 which serves to receive a filling product which can be sprayed and which, for example, foams.
  • the filling product is an extinguishing agent, for instance in the form of an extinguishing gel or extinguishing liquid.
  • the force-generating body 24 is manufactured, preferably from a silicone material, in particular liquid silicone rubber, in an injection-moulding process, with a closed end 32 which is rounded in a spherical manner and an aperture 34 which is formed at the opposite longitudinal end.
  • a silicone material in particular liquid silicone rubber
  • the force-generating body 24 is of single-ply construction, but it may optionally be coated comparatively thinly, on the inner and/or outer sides, with a durable layer made of another material.
  • the force-generating body 24 is suspended in the housing 12 in such a way that, in the unfilled state, its longitudinal axis 28 extends substantially parallel to the housing axis 14 , in particular approximately coincides with the latter.
  • a connecting ring 36 which is produced from a comparatively rigid material of the lowest possible elasticity and is, in turn, connected to the housing 12 .
  • the connecting ring 36 has an axially extending section 38 by which it is inserted in the housing aperture 22 .
  • This axially extending section 38 extends from an approximately annular-disc-shaped section 40 which projects beyond said axially extending section 38 both radially inwards and radially outwards.
  • the annular-disc section 40 masks the housing neck 20 , while it has, on its radially inner rim, an extension 42 which protrudes in the axially upward direction and serves for mounting a lid part 44 which consists, for example, of aluminium or tinplate.
  • the connecting ring 36 may be regarded as roughly T-shaped in cross-section, the axial section 38 forming the main leg of the T and the annular-disc section 40 forming the transverse leg of the T.
  • the T-shape of the connecting ring 36 is modified slightly because of the presence of the extension 42 which protrudes in the axially upward direction.
  • connection between the section 38 , and/or the radially outer part of the section 40 , and the housing 12 . It is likewise possible to conceive of fixing the connecting ring 36 by means of a snap connection or clamping connection or by means of a thread or a bayonet fastener.
  • connection between the connecting ring 36 and the force-generating body 24 is an integrally bonded one. More precisely, said force-generating body 24 is injection-moulded onto the connecting ring 36 , for which purpose, in the course of the injection-moulding operation, the connecting ring 36 may be placed, in the form of a prefabricated component, in the injection mould provided for the force-generating body 24 . It will be recognised that the force-generating body 24 is injection-moulded onto the connecting ring 36 only on the radially inner side of the latter.
  • the regions of the connecting ring 36 that are located on the outside, radially, are free from the material of the force-generating body 24 . This is advantageous for the pressure conditions in the filled state; tensile stresses in the connecting region between the force-generating body 24 and the connecting ring 36 can be avoided better in this way.
  • said connecting ring 36 is preferably produced from a polyamide or from polybutylene terephthalate (PBT) or polyethylene terephthalate (PET).
  • PBT polybutylene terephthalate
  • PET polyethylene terephthalate
  • the lid part 44 In its radially outer region, the lid part 44 is connected to the axial extension 42 of the connecting ring 36 by a crimp connection.
  • a sealing ring 46 which is crescent-shaped in cross-section in the exemplary case shown, is inserted between the lid part 44 and the extension 42 in the crimping region in order to prevent unwanted egress of filling product from the filling space 30 at the connection point between the lid part 44 and the connecting ring 36 .
  • the lid part 44 serves as a carrier for a valve assembly which is designated generally by 48 and which may, for example, be clamped, bonded or fastened in some other way to said lid part 44 . It passes, by means of a base body 50 of the valve, through a central aperture, of which no further description is given, in the lid part 44 , and has an actuating element 52 which can be pressed down in the axial direction by the user and which, at the same time, forms an outlet duct 54 for the extinguishing agent which is to be sprayed.
  • the geometry of the outlet duct 54 may differ, according to the configuration, in particular the viscosity of the extinguishing agent.
  • the force-generating body 24 is constructed, over a large part of its length which is located axially below (i.e. on the far side) of the connecting ring 36 , after the manner of a hose with a cross-section which is circular on both the inner periphery side and the outer periphery side.
  • the hose-shaped region no major fluctuations in the wall thickness occur, above all no alternating increases or decreases in the wall thickness.
  • This hose-shaped region starts approximately at an axial position which is drawn in broken lines at 56 in FIG. 1 and extends axially as far as the point at which the wall of the force-generating body 24 starts to converge in the region of the closed end 32 . This position is indicated diagrammatically at 58 in FIG. 1 .
  • the force-generating body 24 may, for example, have, in the hose-shaped region, an inner peripheral face 60 that tapers conically towards the closed end 32 with respect to the longitudinal axis 28 , and also an outer peripheral face 62 that extends in a circular-cylindrical manner in relation to said axis 28 .
  • the angle (angle of widening-out of the wall thickness) formed between the conically tapering inner peripheral face and the cylindrical outer peripheral face is, for example, about 0.2 to 0.3 degrees. Over an axial distance of, for example, about 10 cm, the growth in wall thickness then corresponds to a few tenths of a millimetre (e.g. about 0.4-0.5 mm).
  • both the outer peripheral face and the inner peripheral face of the force-generating body 24 may extend in a conical manner, in which case they both taper towards the closed end 32 of said body.
  • the tapering of the inner peripheral face may be greater than that of the outer peripheral face resulting, overall, in a growth in the wall thickness as it continues towards the closed end 32 of the force-generating body.
  • the angle of widening-out of the wall thickness may, once again, have a value of the order of magnitude of tenths of a degree or may, under certain circumstances, be slightly smaller than before, since an effective reduction in the diameter of the force-generating body is superimposed upon the growth in wall thickness on account of the tapering of the outer peripheral face.
  • the diameter of the force-generating body 24 may be reduced in the hose-shaped region, with a constant wall thickness.
  • the inner peripheral face and the outer peripheral face are preferably both of conical design and both taper towards the closed end 32 with the same angle of tapering.
  • the angle of reduction of the diameter may have a similar value (in the region of tenths of a degree) to that which the angle of widening-out of the wall thickness had previously.
  • the region of continuous increase in the wall thickness of the force-generating body 24 and/or of continuous reduction in the diameter extends over a major part of the axial overall length of the force-generating body 24 , for example at least 70% or even at least 75%.
  • the force-generating body 24 may have a more complex wall geometry.
  • the axial length of this region is short, compared to the overall length of said force-generating body 24 .
  • the force-generating body 24 has, in the region of the axially lower end of the connecting ring 36 , a point of enlarged wall thickness at which there is located a circumferential thickened portion 63 of the wall that protrudes radially inwards. Said thickened portion 63 of the wall helps to keep the stresses in the material of the force-generating body 24 low in the region of the axially lower end of the connecting ring 36 .
  • said thickened portion may serve as a de-moulding aid for the mould core of the injection mould used for manufacturing the force-generating body 24 .
  • FIG. 3 a shows the unfilled state of the force-generating body 24 . It can be seen that said force-generating body 24 is at an axial distance from the bottom part 18 of the housing 12 . It is also at a radial distance, all the way round, from the jacket part 16 , this applying at least to that region in which the force-generating body 24 is capable of stretching radially and is very largely unhindered by the connecting ring 36 from expanding radially.
  • FIGS. 3 b, 3 c, 3 d and 3 e show states of expansion of the force-generating body 24 at different degrees of filling, until a final filling state is reached ( FIG. 3 e ).
  • the volume fed in depends upon a nominal filling quantity predetermined for the container 10 and is, in any case, greater than said quantity.
  • the dead volume of the force-generating body 24 (internal volume in the unfilled state) may be kept small by the provision of a volume-displacer (of which no further details are represented).
  • the expansion of the force-generating body 24 takes place in both the radial direction and the axial direction. It will be seen that the radial expansion is initially greatest approximately in an axial central region of the force-generating body 24 (centrally with respect to its particular axial length). At a sufficient degree of filling, the force-generating body 24 finally abuts on the jacket part 16 all the way round ( FIG. 3 c ). As a result of this, there are separated off, axially above and below the area of abutment in which the force-generating body 24 bears against the jacket part 16 , two partial spaces 64 , 66 between the housing 12 and the force-generating body 24 , the volumes of which spaces increasingly diminish as the filling of the force-generating body 24 continues.
  • the area of abutment in which the force-generating body 24 bears against the jacket part 16 continues to expand in both axial directions, i.e. axially downwards and also axially upwards (although to a greater extent axially downwards).
  • the jacket part 16 forms a first wall portion, within the meaning of the invention, that limits the radial expansion.
  • the force-generating body 24 has expanded axially to at least close to the bottom part 18 of the housing 12 and lies flat at that point, preferably in an approximately spherical bottom trough 68 (see FIG. 3 d ).
  • the force-generating body 24 bears against the jacket part 16 over a large part of the axial length of said jacket part.
  • the impinging of the force-generating body 24 against the bottom part 18 preferably takes place shortly before the nominal filling quantity is reached, for example only after the feeding-in of at least 80%, better at least 85% and better still at least 90% of the nominal filling volume of the container 10 .
  • the bottom part 18 forms a second wall portion, within the meaning of the invention, that limits the axial expansion.
  • the tensile stress stored within the force-generating body 24 brings about a force which acts upon the filling product that has been fed in, and by which force said filling product is forced out the container 10 when the valve assembly 48 is actuated. No other force-generating means are present in the container 10 shown. The dispensing force is applied completely by the force-generating body 24 .
  • the filling quantity (filling volume) which is to be fed in until the final filling state is reached may be, for example, between 105% and 115% of the nominal filling quantity assigned to the container 10 . It is preferable if, in the course of the filling of the container 10 , so much filling product is fed in that the total quantity fed in corresponds to the nominal filling quantity, plus the initial volume of air in the filling space 30 when the force-generating body 24 is in the unfilled state, plus an additional volume.
  • This additional volume serves to compensate for losses which may result from a decreasing restorability of the—stretched—force-generating body 24 and from an escape of fractions of the filling product through the wall of said body.
  • the additional volume may be at least as great again as the initial volume of air in the filling space 30 of the un-stretched force-generating body 24 .
  • FIG. 4 shows, by way of examples, qualitative progressions for the axial elongation (characteristic curve 1 ) and the widening-out of the diameter (characteristic curve 2 ) during the filling of the container 10 .
  • the force-generating body 24 Up to a filling volume V 1 , the force-generating body 24 is able to expand both axially and radially without being restricted by the housing 12 .
  • the force-generating body 24 comes into contact with the jacket part 16 of the housing 12 for the first time. This corresponds to the state shown in FIG. 3 c.
  • the term “force element” used in FIG. 4 refers to the force-generating body 24 ; “wall” means that part of the housing wall which is formed by the jacket part 16 .
  • the characteristic curve 2 changes into a horizontal straight line from the filling volume V 1 onwards.
  • the tip of the force-generating body 24 i.e. its closed end 32
  • this is indicated by a continued rise in the characteristic curve 1 beyond the filling volume V 1 .
  • the axially lower end 32 of the force-generating body 24 impinges upon the bottom part 18 of the housing 12 . That is when the filling operation is terminated, if not before. Beyond this point at which the force-generating body 24 impinges upon the bottom part 18 , no further filling, or at least no significant further filling, takes place.
  • the feeding-in operation may optionally be terminated even before the force-generating body 24 impinges upon the bottom part 18 .
  • the filling volume V 2 at which the filling operation is terminated lies above the nominal filling volume of the container 10 .
  • the total filling volume V 2 fed in might be about 900 cm 3 for an indicated nominal filling volume of the container of 800 cm 3 .
  • the diagram in FIG. 4 makes it clear that the first radial abutment of the force-generating body 24 on the jacket part 12 takes place comparatively early, before the final filling state (filling volume V 2 ) is reached.
  • the filling volume V 1 may, for example, be between 20% and 50%, and preferably between 25% and 40%, of the filling volume V 2 .
  • the filling volume V 2 is at least 2.0 times, for example about 3.0 times, the filling volume V 1 , or even a still larger multiple thereof.
  • the filling volume V 1 may be, for example, about 30% to 35% of said nominal filling volume.
  • the empty volume of the housing 12 As an alternative to the nominal filling volume, it is also conceivably possible to use the empty volume of the housing 12 as a reference. This is understood to mean the volume of the inner space 26 of the housing with the force-generating body 24 missing. With respect to such an empty volume of the housing 12 , the filling volume V 1 may, for example, be between, say, 20% and 30%.
  • the widening-out of the diameter of the force-generating body 24 until it impinges upon the jacket part 16 may be, for example, between 200% and 300%, and the axial elongation on reaching the filling volume V 2 may be, for example, between 80% and 150%.
  • the free space which is present, in the unfilled state, axially underneath the force-generating body 24 as far as the bottom part 18 of the housing 12 is so dimensioned that said force-generating body 24 abuts axially on the bottom part 18 only after the feeding-in of a filling quantity that exceeds the nominal filling volume of the container 10 , that is to say after more than 100% of the nominal filling volume.
  • abutment of the force-generating body 24 on the bottom part 18 takes place only after the feeding-in of at least 110% or even at least 120% of the nominal filling volume of the container 10 .
  • the axial free space underneath the force-generating body 24 may be so dimensioned that abutment of said body on the bottom part 18 does not take place before at least 85% and preferably at least 90% of the empty volume of the housing are fed into the force-generating body 24 .
  • the friction between the inner surface of the housing 12 , in particular the inner surface of the jacket part 16 , and the outer surface of the force-generating body 24 may be considerable. This particularly applies to the case where the force-generating body 24 is manufactured from a silicone rubber. Silicone materials often have a surface which permits anything but smooth sliding. If, in addition, the housing 12 is produced from a plastic, in particular polyethylene or polypropylene, the result may easily be a pairing of materials between the housing 12 and the force-generating body 24 that prevents almost any slipping (sliding).
  • the inner surface of said housing 12 is sprayed, at least in the region of the jacket part 16 , with a friction-reducing substance, such as is represented diagrammatically in FIG. 5 .
  • Said friction-reducing substance is preferably a water-based lubricant (e.g. with glycerine as an additional main constituent) which may at least partly evaporate with time.
  • a silicone-based or mineral oil-based lubricant should not be used if use is made of a force-generating body made of silicone rubber, since the lubricant could attack the material of said body.
  • the lubricant is sprayed, for example, by means of a spraying bar 70 which may be introduced into the housing 12 through the neck 20 of said housing.
  • a spraying bar 70 By means of the spraying bar 70 , the jacket part 16 may be sprayed over at least part of its axial length and, if desired, the bottom part 18 of the housing 12 may also be sprayed on the inside with the lubricant.
  • a spraying control unit 72 which is indicated diagrammatically, controls the spraying operation.
  • the force-generating body 24 which has been produced separately beforehand, is then inserted (together with the connecting ring 36 adhering to it), in the housing 12 during the assembly of the container 10 , and is connected to said housing. This is indicated diagrammatically in FIG. 5 by an arrow 74 .
  • the container having been finally assembled, can then be filled with the desired filling product, after the valve assembly 48 (or other suitable valve means) have also been attached beforehand.
  • a reduction in friction between the housing 12 and the force-generating body 24 can be obtained by fluorination of at least one of the two surfaces forming the friction pairing.
  • the surface properties can be altered, and the friction thereby also reduced, by fluorination.
  • both silicone materials and other plastics can be satisfactorily fluorinated.
  • the fluorine compounds created by fluorination on the surface of the body treated in this way are, as a rule, comparatively stable, so that fluorination is eligible for consideration not only when, but especially when, there is a risk to the materials of the housing 12 and of the force-generating body 24 of “dry-bonding” as a result of the formation of hydrogen bridges.
  • FIGS. 1 and 3 a to 3 e there can clearly be seen a number of radial recesses 76 constructed in the jacket part 16 of the housing 12 , in which connection the term “recess” should be understood here from the viewpoint of an observer looking at the jacket part 16 from the inside of the housing.
  • said recesses 76 are groove-like and extend in the peripheral direction of the jacket part 16 . They may, for example, pass over the entire periphery of the housing.
  • a number of recesses 76 may be arranged at intervals, one behind another in the peripheral direction, in an axial plane.
  • recesses 76 of this kind are provided one above another in a number of axial planes.
  • At least some of the recesses 76 are located in a region of the jacket part 16 in which the force-generating body 24 abuts, in the course of its expansion over the recess 76 in question, on the jacket part 16 , under which circumstances the force-generating body 24 is able to expand to a slightly greater extent in the region of the recess 76 , i.e. is able to expand into the latter.
  • such “latching” of the force-generating body in relation to the housing 12 may, for example, take place in the recesses which are identified by 76 ′ therein, because it is these recesses 76 ′ which the force-generating body 24 completely masks until the final filling state is reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Sealing Devices (AREA)
US13/985,309 2011-02-16 2012-02-15 Method for producing a container for a bulk product Abandoned US20140061244A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011011352A DE102011011352B4 (de) 2011-02-16 2011-02-16 Reibungsgeminderter Füllgütbehälter mit gummielastischem Krafterzeugungskörper zur Aufnahme des Füllguts
DE102011011352.5 2011-02-16
PCT/EP2012/000668 WO2012110235A1 (de) 2011-02-16 2012-02-15 Verfahren zur herstellung eines behälters für ein füllgut

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US20140061244A1 true US20140061244A1 (en) 2014-03-06

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US13/985,309 Abandoned US20140061244A1 (en) 2011-02-16 2012-02-15 Method for producing a container for a bulk product

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US (1) US20140061244A1 (ja)
EP (1) EP2675726A1 (ja)
JP (1) JP2014506859A (ja)
KR (1) KR20140027112A (ja)
CN (1) CN103476683A (ja)
BR (1) BR112013020830A2 (ja)
CA (1) CA2830345A1 (ja)
DE (1) DE102011011352B4 (ja)
RU (1) RU2013140862A (ja)
WO (1) WO2012110235A1 (ja)

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US9573737B2 (en) 2015-04-15 2017-02-21 Dow Global Technologies Llc Flexible container with a spray valve
US20190077578A1 (en) * 2015-10-07 2019-03-14 Conopco, Inc., D/B/A Unilever Device
US10377555B2 (en) 2015-04-15 2019-08-13 Dow Global Technologies Llc Flexible container with a spray valve
US20200031564A1 (en) * 2017-04-05 2020-01-30 Kikkoman Corporation Dispensing container

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KR101652254B1 (ko) * 2015-04-10 2016-08-30 (주)대창솔루션 초저온 유체 저장탱크 제조방법
FR3068018B1 (fr) * 2017-06-26 2019-08-02 L'oreal Recipient pressurise

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US9573737B2 (en) 2015-04-15 2017-02-21 Dow Global Technologies Llc Flexible container with a spray valve
US10377555B2 (en) 2015-04-15 2019-08-13 Dow Global Technologies Llc Flexible container with a spray valve
US20190077578A1 (en) * 2015-10-07 2019-03-14 Conopco, Inc., D/B/A Unilever Device
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CA2830345A1 (en) 2012-08-23
RU2013140862A (ru) 2015-03-27
CN103476683A (zh) 2013-12-25
WO2012110235A1 (de) 2012-08-23
JP2014506859A (ja) 2014-03-20
EP2675726A1 (de) 2013-12-25
BR112013020830A2 (pt) 2016-10-04
DE102011011352B4 (de) 2013-06-06
DE102011011352A1 (de) 2012-08-16
KR20140027112A (ko) 2014-03-06

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