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
  • B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
  • B65D35/44—Closures
  • B65D35/46—Closures with valves
• • 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
  • B65D47/00—Closures with filling and discharging, or with discharging, devices
  • B65D47/04—Closures with discharging devices other than pumps
  • B65D47/20—Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
  • B65D47/2018—Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge comprising a valve or like element which is opened or closed by deformation of the container or closure
  • B65D47/2056—Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge comprising a valve or like element which is opened or closed by deformation of the container or closure lift valve type
  • B65D47/2062—Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge comprising a valve or like element which is opened or closed by deformation of the container or closure lift valve type in which the deformation raises or lowers the valve stem
  • B65D47/2075—Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge comprising a valve or like element which is opened or closed by deformation of the container or closure lift valve type in which the deformation raises or lowers the valve stem in which the stem is raised by the pressure of the contents and thereby opening the valve
• • 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
  • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
  • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
  • B65D81/28—Applications of food preservatives, fungicides, pesticides or animal repellants

Definitions

• the invention relates to flexible tubes for storing and distributing liquid to pasty products while keeping them away from ambient air.
• these tubes are fitted with pumps or so-called “non-return" valves which prevent on the one hand the backward flow towards the inside of the product already out of the dispensing orifice and on the other hand the air entry caused by the release of the press on the pump or the skirt.
• Application FR 2 630 998 filed by the applicant discloses a tube comprising a skirt as well as a head equipped with a distribution pump provided with an annular rim.
• This head is fixed to the skirt of the tube and includes a shoulder connecting the skirt to a plastic crown molded on the annular rim for fixing the pump.
• the plastic material of the semi-rigid crown is of the same nature as that of the surface layers of the body or of the skirt.
• the rim of the pump is embedded in the crown which is therefore quite thick.
• the pump is a pump without air return (or "airless") of the type disclosed in application FR 2 528 122 (VALOIS)
• VALOIS airless
• the fixing of the pump is particularly tight due to the embedding of the rim in the molded crown.
• US Patent 3,438,554 discloses a one-way valve disposed in the neck of a flexible tube and having:
• a shutter element consisting of a flared head oriented towards the outside, housed in a valve seat formed on the edge surrounding the opening of the neck and connected to the end of a central rod which extends over more than the height of the neck.
• a ring with a diameter greater than the internal diameter of the neck intended to be introduced inside the container and connected to the other end of the rod, located below the ring, by means of support elements helical elastic.
• the flared head is elastic and deformable, the ring is rigid.
• the shutter element is introduced into the neck from the inside, the flared head is deformed to pass through the bore of the neck and is then released when it exceeds the valve seat.
• the shutter element is then kept fixed in the neck by trapping the inner wall of the neck and the central part of the shoulder between its flared head and the rigid ring.
• This valve is inspired by a valve operating in the other direction and intended to supply liquid product to an applicator pad located at the outlet of the orifice (US 3,203,026).
• a double-envelope tube comprising an external envelope and an internal envelope, each of the envelopes comprising a neck, a shoulder and a skirt, in which the external and internal envelopes are rigidly assembled to the level of the necks and shoulders, the shutter of the orifice of the neck of the internal envelope is connected by flexible and elastic tabs to the neck of the external envelope, the assembly of the legs and of the cover acting as a valve.
• a calibrated air passage is arranged between the space which separates the two envelopes on the side of their skirts and the space which separates the two envelopes on the side of their necks
• US Patent 4,635,826, "continuation-in-part" of application JP58129269 discloses a tube whose head is provided with a valve inserted in the neck of said flexible tube.
• the valve includes a shutter in the form of a disc “free”, in the sense that it is not connected to other elements of the valve and that it can follow a limited axial displacement.
• This disc rests on a transverse wall provided with an orifice, which is thus closed by the disc.
• Said transverse wall is connected to an annular support and said annular support is fixed to the internal wall of the neck.
• the maintenance of the valve inside the neck is ensured by axisymmetric snap beads located on said annular support and fitting into axisymmetric grooves of complementary shapes arranged on the internal surface of the neck.
• the tube head produced according to FR 2 630 998 is quite expensive, due to the very quality of the pump associated with this head.
• the tube fitted with such a pump has a poor restitution rate, linked to the large diameter of the rigid crown on which the rim of the pump is embedded.
• the valve of US 3 438 554 is difficult to introduce into the neck since it is necessary to radially deform the elastic flared head in order to be able to trap the neck and the interior of the central part of the shoulder between this elastic head and the rigid ring.
• this valve has a certain number of drawbacks in use: the head having been preformed with a view to its introduction into the neck does not always recover its initial shape perfectly if although it does not lean tightly in its valve seat; moreover, during use, the head comes out of the tube, which makes it fragile. Finally, it always constitutes an obstacle in front of the dispensing orifice, which has the result that the extrudate comes out with a poorly controlled flow as much in the flow distributed as in the direction of the jet.
• the tube head disclosed by US 4,635,826 has several drawbacks.
• the limited axial displacement disc does not always return to its closed position.
• the head thus equipped with its valve does not allow good product recovery rates to be obtained.
• a certain quantity of the product remains attached to the walls of the base of the annular support of the valve which protrudes inside the volume delimited by the shoulder and another part remains blocked in the large cylindrical volume delimited by said annular support.
• the wall of the annular support and that of the neck are together sufficiently rigid to prevent emptying the cylindrical cavity which they envelop of the product contained therein, they remain easily deformable and therefore make the fixing less reliable and less leaktight than was originally desired.
• the Applicant has therefore sought to develop a "non-return" valve which is easy to manufacture, easy to mount in the neck of the tube and making it possible to deliver the product with controlled flow and direction of jet.
• This valve must be able to be produced and mounted under mass production conditions. Finally, it must remain firmly held in the neck during the entire duration of the use of the flexible tube and the tube thus equipped must have a good rate of restitution.
• the object according to the invention is a flexible tube head comprising a neck provided with a dispensing orifice and a shoulder intended to connect said neck to the rest of the tube, said head being provided with a valve inserted in the neck said flexible tube, said valve comprising a shutter associated with an annular support provided with an orifice, said shutter being held in the closed position of said orifice when the tube is not compressed and in the open position when the tube is compressed , characterized in that in the bottom part of the neck, which is the transition zone between the shoulder and the neck, the internal surface of the tube is provided with a bore coaxial with the neck and on which said annular support is fixed, the thickness of said area of transition with respect to said bore remaining substantially equal to or greater than the average thickness of the neck.
• the valve comprises an annular support and a shutter element which rests - with or without plugging it - above an orifice formed in said annular support, which is fixed on the internal surface of the head in the vicinity of the base of the neck. , that is to say at the foot of the chimney formed by or near the neck, on the internal surface of the shoulder.
• the shutter element comprises a shutter which obstructs the flow of the product through the orifice or hole formed in the annular support. It is not necessary to choose a form of shutter such that it can fit into the hole - a conical interlocking for example - because the displacement imposed on the shutter when the user presses on the skirt is such that it will be difficult for him to return to exactly the same position.
• the lower part of the neck is the transition zone between the neck and the shoulder which extends on either side of the border between the substantially cylindrical part of the neck and the substantially conical part of the head on a distance typically close to one and a half or two times the greatest of the average thicknesses of each of these parts. It comprises a bore coaxial with the neck and intended to receive the annular support of the valve, said bore being designed to promote the firm maintenance of the annular support in said bore.
• neck base In general, at the bottom of the neck - the transition zone which has also been called “base of the neck” - an external shoulder is intended to make an unsightly transition between the external surface of the external skirt and the capsule and that of the wall of the tube.
• This shoulder which we will call hereafter “neck base”, contributes to the increase in thickness and therefore to the increase in rigidity of this area.
• this area has a small extent, especially in height. It thus provides a rigid and stable housing for the annular support of the valve. The result is not only good mechanical strength of the head fitted with its valve but also good sealing, both with regard to the product - which must only pass through the valve - and with air - which must not pass between the annular support of the valve and this bore, at the risk of polluting the product. It is therefore not recommended to try to ensure a firm hold between the bore and the annular support of the valve outside said bottom portion of the neck because the contact is not stable there because of the excessive deformability of the parts - especially the neck - outside this area and the resulting risk of loss of tightness.
• the firm holding of the valve in the head can be supplemented by various means at the level of the contact between the external surface of the annular support of the valve and the surface of the bore. It is thus possible to envisage fixing the valve by simply pressing the annular support forcibly into the bore, for example by defining the outside diameter of the annular support greater by 1 to 5% than the diameter of the bore, when these these are free of constraints.
• the annular support can also be held firmly in said bore by bonding the surfaces intended to be brought into contact with one another, or even by welding them.
• the fixing can also be carried out by combining tightening and thermal contribution, by differential heat shrinking: under the effect of heat, the plastic material of the head (in the vicinity of the base of the neck) shrinks more strongly than the plastic material of the support annular, so that, even without intimate welding of the two plastics, mechanical tightening is established between the two parts.
• the valve has a part, first introduced into the neck, of smaller dimension than said bore and another part, comprising the annular support, the shape and the dimensions are close to those of the bore, and by which the valve is kept attached to the neck. In this way the part of the valve introduced first into the neck is not damaged, the tightening and / or bonding occurring only at the end of insertion of the valve into the neck.
• the fixing of said annular support on said bore is effected by force pressing and the surface external of said annular support and the surface of the bore are provided with complementary securing means.
• complementary securing means are at least axial immobilization means: for example a groove and a bead or even two circumferential beads, continuous or not.
• the latter are auxiliary means and do not necessarily take the form of large reliefs: a discontinuous bead of small radial height (typically 0.1 mm) is sufficient. In this way, the forced entry is little hampered and the reliefs are not destroyed.
• said neck is surmounted by a transverse top wall surrounding the dispensing orifice and the shutter is connected to said transverse top wall by means of elastically deformable support elements.
• the valve then consists of two separate elements: a shutter element fixed on - or molded in one piece with - the top wall of the head and an annular support provided with an orifice intended to be closed by said shutter and put in place by driving into a bore in the vicinity of the base of the neck.
• the valve is a deformable element comprising a valve and a valve seat molded in one piece, corresponding to the upper part of the deformable element intended for pumping pasty products described by the applicant in EP 0309 367.
• This element comprises two adjacent parts which are spatially and functionally distinct: at the bottom, a deformable veil in the form of a thinned dome - which allows the suction of the pasty product - and, at the top, a valve for expelling the pasty product .
• This expulsion valve also ensures perfect air tightness.
• This embodiment is detailed in the second example.
• said shutter is held in abutment on said annular support by the effect of the only depression prevailing inside the tube.
• This embodiment is detailed in the third example.
• the valve comprises a shutter element consisting essentially of a shutter connected, via elastically deformable support elements, to a ring whose bore offers a passage for the product to be dispensed, said ring and said support elements deformable being designed to keep the shutter in the closed position when the tube is not compressed and to allow it to be in the open position when the tube is compressed, said obturator element being inserted at least partially into a body hollow which is itself forced into a bore in the lower part of the neck.
• Said hollow body has a first end, open and oriented towards the dispensing orifice and a second end, oriented towards the inside of the shoulder - that is to say towards the inside of the tube when the head is fixed.
• on the skirt of the tube - has a transverse wall provided with a hole, said shutter being placed facing said hole of the transverse wall, in order to close it when the - not
• the ring it is not necessary for the ring to be fully inserted into the bore of the hollow body, but it must be at least partially, in particular the part comprising the clips of the elastic support elements of the 'shutter, so that said elastic support elements can move and deform without encountering an obstacle other than the fluid contained in the tube and can thus function properly.
• the neck may for example have a transverse top wall which surrounds the dispensing orifice and serves as a stop trapping the ring between itself and the open end of the hollow body.
• the ring has a part which fits into the hollow body, that which has the attachments of the deformable support elements of the shutter and another part whose external contour substantially matches that of the bore of the neck and which must be introduced into the bore of the neck prior to the hollow body.
• complementary immobilization means typically a groove and a bead or even two snap beads located respectively on the outer surface of the ring and on the inner surface of the hollow body.
• This solution also has the advantage of joining the hollow body and the obturating element before introducing them into the tube head.
• An independent valve is thus obtained in which the hollow body houses the obturator element kept compressed between the ring fixed inside the first cylindrical wall near its opening and the transverse wall of its second end. In this way, it is possible to introduce a single piece through the base of the neck, which favors the manufacturing conditions at high rates.
• the ring has two parts: one which is inserted into the hollow body and remains fixed there thanks to complementary means of securing, typically latching and another part, whose external contour is substantially close to that of the hollow body, first introduced into the neck bore.
• the shutter element is composed of a shutter, a ring and elastically deformable support elements.
• the latter are advantageously in the form of fine helical arms. It consists of a plastic material chosen as a function of the stiffness sought for these elastic support elements, typically a polyolefin or a polyester.
• the shutter element is fitted with at least two arms of this type, regularly distributed. If it requires the production of molds of complex shape, the molding of the obturator element does not present any major difficulties due to the homogeneity of the thicknesses and the symmetrical distribution (axis symmetry) of the elements which allow obtain slightly deformed parts at the end of cooling.
• the obturator element is then inserted into the hollow body and, whether or not integral with said hollow body, is introduced with the latter inside the neck.
• the hollow body is forcibly inserted into the bore of the neck so that the valve remains fixed inside the neck throughout the duration of use of the flexible dispensing tube. It must in fact resist the depression which occurs inside the tube and increases as the consumption of the product contained by the tube increases.
• the force insertion corresponds to a tightening, that is to say that on at least part of the contact surface, the diameter of the bore is, at rest, less than that of the hollow body.
• the tightening must withstand forces of the order of 20 N and corresponds to a difference in diameter between 0.08 and 0.40 mm for a diameter of 8 mm, i.e. a tightening typically between 1 and 5%.
• the external wall of the hollow body is essentially an axisymmetric wall composed of two cylindrical walls connected to each other by a shoulder.
• the first cylindrical wall is provided with the first end.
• the second cylindrical wall has a larger diameter and is provided with the second end.
• the bore of the neck has an identical geometry: two cylindrical walls connected to each other by a shoulder, a cylindrical wall at the base of the neck of diameter greater than that of the cylindrical part located in the vicinity of the dispensing orifice.
• the first cylindrical wall of the hollow body has a diameter slightly smaller than the inside diameter of the neck in the corresponding part: at the time of the insertion of the valve into the inside of the neck, no effort is initially put into play.
• the first step is to effortlessly center and align the axis of the valve with that of the bore.
• the second cylindrical wall has a diameter slightly greater than the diameter of the corresponding bore located at the base of the neck, so that at the end of insertion, when the second cylindrical wall of the hollow body comes into contact with this bore, a significant effort must be applied to overcome the tightening and push the valve until the shoulder of the hollow body abuts against the shoulder of the bore.
• axial immobilization means are provided on the surface of the second cylindrical part of the hollow body and on that of the bore of the base of the neck.
• shoulders already serve as a stop for the movement towards the orifice, it suffices to create a bead of small amplitude on the bore of the base of the neck which obstructs the disengagement of the valve, itself provided with a bead of small height on its second cylindrical wall.
• the bead formed on the bore at the base of the neck may be discontinuous and advantageously be in the form of grains of rice regularly distributed.
• the particular geometry of the rice grains allows, despite their small size, to firmly hold the valve fixed in the bore of the neck, resistant to a force of 20N.
• valve less elaborate and less expensive than those fitted with pumps of the type described in FR 2732315, makes it possible, if care is taken to recap after each use, the orifice using '' a conventional closure capsule, to maintain the interior of the tube in vacuum, protected from air for several months.
• This valve initially intended to prevent the flow of very liquid products, works surprisingly well, even if the elastically deformable support elements are immersed in the product to be dispensed, as long as the viscosity of the latter is not greater than 7000 centipoise .
• the plastic material of the obturating element can be chosen from plastics, in particular polypropylenes, having a greater stiffness.
• the elements of the valve are, with the internal wall of the annular support in continuous contact with the product to be dispensed just before it leaves the dispensing orifice
• This fact can be used advantageously: by grafting on their surface of bactericidal molecules using a method such as that described in PCT / FR97 / 01403. In this way, the prophylactic protection of the product contained in the tube can be significantly improved.
• the tube skirt and the shoulder comprise at least one layer made of a plastic material having a good barrier property to the diffusion of gases, such as the copolymer (ethylene - vinyl alcohol) (EVOH).
• EVOH ethylene - vinyl alcohol
• FIG. 1 illustrates a partial diametric half-section of a particular tube head according to the invention corresponding to the first embodiment.
• the cover and its elastic support element are not shown in section.
• FIG. 2a illustrates a diametrical half-section of a particular tube head according to the invention corresponding to the second embodiment.
• Figure 2b shows the one-piece valve after molding and before its introduction into the neck.
• FIG. 3 illustrates a diametrical half-section of a particular tube head according to the invention corresponding to the third embodiment.
• FIG. 4 illustrates a diametral section of a particular tube head according to the invention corresponding to the fourth embodiment.
• This example illustrates the first embodiment.
• the neck 103 is surmounted by a transverse top wall 108 surrounding the dispensing orifice 180 and the shutter 112 is connected to said transverse top wall 108 by means of elastically deformable support elements 113.
• the valve then consists of two separate elements: a shutter element 111 fixed on - or molded in one part with - the top wall 108 of the head and an annular support 115 provided with an orifice 122 intended to be closed by said shutter 112.
• the base of the neck is the transition zone between the neck 103 and the shoulder 102.
• It comprises a fixing skirt 130 provided with a latching bead 106 and a base 125, which is an external shoulder intended to ensure a transition without "hole” between the external surface of the external skirt of the capsule (not shown) and the external surface of the head of the tube 100.
• the annular support 115 is put in place by pressing into the neck, its lower part being blocked against the internal wall of the fixing skirt 130 formed at the base of the neck.
• This internal wall constitutes a bore 105 formed in the vicinity of the base of the neck 103.
• the fixing skirt 130 is provided at its end with a latching bead 106 which traps the end of the annular support 115
• This example illustrates the second embodiment.
• the valve is a deformable element comprising a flexible shutter 212 and an annular support 215, one end 250 of which acts as a valve seat.
• the whole is molded in one piece. It corresponds to the upper part of the deformable element intended for pumping pasty products described by the applicant in EP 0309 367 and comprising at the bottom, a deformable veil in the form of a thinned dome - which allows the suction of the pasty product - and , in the upper part, a valve for expelling the pasty product.
• Figure 2b shows this expulsion valve which is used in the context of the present invention as a non-return valve. It is illustrated in the geometrical configuration which it presents just after molding and before its introduction inside the neck.
• the periphery of the flexible shutter 212 bears on the end of the annular support 215 which thus acts as a valve seat. Under the effect of a pressure on the tube, the shutter deforms a little more and lets the product pass. As soon as the pressing on the tube stops, the end of the shutter comes to rest on the end of the annular support 215.
• the shutter and the support elements are connected to a central rod 270 which remains coaxial with the neck 203 thanks to a cavity 260 formed in the center of the transverse top wall 208.
• the end of the neck does not does not have a central orifice but several annular orifices 280.
• the base of the neck is the transition zone between the neck 203 and the shoulder 202. It comprises a base 225, which is an external shoulder intended to ensure a transition without "hole” between the external surface of the external skirt of the capsule. (not shown) and the external surface of the head of the tube 200
• the flexible shutter in circumferential support on the upper end 250 of the annular support 215.
• the outside diameter of the annular support 215 is 2% greater than the diameter of the lower part 205 of the neck 203.
• the annular support and the bore are provided with complementary snap-fastening means 206 and 224.
• This example illustrates the third embodiment.
• the base of the neck is the transition zone between the neck 303 and the shoulder 302. It comprises a base 325, which is an external shoulder intended to ensure a transition without "hole” between the external surface of the external skirt of the capsule. (not shown) and the external surface of the head of the tube 300
• the shutter 312 and the annular support 315 are molded in one piece: they are held together by easily breakable bridges. We can observe in Figure 3, the portions 390 and 391 of one of these bridges after rupture. The rupture is obtained by simply pressing the part corresponding to the shutter in the direction of that corresponding to the annular support.
• the penetration leading to the breaking of the breakable bridges is preferably done just before the introduction of the assembly of the two parts into the neck. In this way, the shutter 312 is trapped between the annular support 315 which is forced into or glued into the bore 305 of the base of the neck and the transverse top wall 308.
• the shutter 312 is held in abutment on the annular support 315 by the effect of the only depression prevailing inside the tube.
• the product presses on the shutter and the latter lifts.
• the return elastic of the skirt causes a depression which again presses the shutter against the transverse wall 321 of the annular support 315 which surrounds the orifice 322.
• the elastic return of the skirt here being a driving element, the latter will be chosen from a material or a set of rigid materials, having low crushability (property also called "dead fold property").
• the tube head 400 comprises a neck 403 with a dispensing orifice 408 and a substantially frustoconical shoulder 402 connecting the skirt 409 of the tube to the neck 403.
• the base of the neck is the transition zone between the neck 403 and the shoulder 402. It comprises a base 425, which is an external shoulder intended to ensure a transition without "hole” between the external surface of the external skirt of the capsule. (not shown) and the external surface of the head of the tube 400
• the cylindrical housing 405 has a discontinuous bead, in the form of grains of rice 406 which are intended to snap into a circumferential groove 424 formed on the second cylindrical wall 417 of the valve 410.
• the cylindrical housing 405 has a depth such that the shoulder 407 connecting it to the bore of the central part of the neck serves as a stop for the shoulder 418 connecting the first cylindrical wall 416 and the second cylindrical wall 417 of the valve 410, the latter being immobilized in translation axial by clamping the second cylindrical wall 417 in the housing 405, by the shoulder 407 and the grains of rice 406 trapped in the circumferential groove 424.
• the outer wall of the hollow body 415 is an axisymmetric wall composed of two cylindrical walls connected to each other by a shoulder.
• the first cylindrical wall 416 is provided with the first end 419, open and oriented towards the dispensing orifice 480.
• the second cylindrical wall 417 has a larger diameter and is provided with the second end, equipped with the transverse wall 421 provided with a hole 422.
• the bore of the neck has an identical geometry: two cylindrical walls connected together by a shoulder, a cylindrical wall 405 at the base of the neck with a diameter greater than that of the cylindrical wall 404 located in the vicinity of the orifice of distribution.
• the first cylindrical wall 416 of the hollow body 415 has a diameter less than the diameter of the bore 404 of the neck in the corresponding part: at the time of the insertion of the valve into the interior of the neck, no effort is initially put The first step is to effortlessly center and align the axis of the valve with that of the bore.
• the second cylindrical wall 417 has a diameter of 8.2 mm greater than the diameter of 7.9 mm of the corresponding bore 405 located at the base of the neck, so that at the end of insertion, when the second cylindrical wall of the hollow body comes into contact with this bore, a significant force (of the order of IO N) must be applied to overcome the tightening and push the valve down until the shoulder 418 of the hollow body comes into abutment against the 407 shoulder of the bore.
• the valve thus fixed in the bore of the neck resists a disengagement force of 20N.
• the hollow body 415 plays the role of the annular support claimed in the present invention.
• the shutter element 411 is composed of a shutter 412, a ring 414 and three support elements 413 elastically deformable in the form of fine helical arms with one turn. They are made of high density polyethylene. They are 0.3 mm thick and 0.7 mm wide. With creams of viscosity greater than 5000 centipoise, they should be thickened to increase their elastic stiffness. As long as their thickness remains less than 0.5 mm and their width remains less than 1 mm, their size is small and they do not disturb the flow of the product.
• valve Although initially intended to serve as a valve for low viscosity liquid products, this valve fulfills its role even with fairly viscous creams (up to 7000 centipoise).
• the height of the second cylindrical wall 417 is reduced, so that the transverse wall 421 comes flush with the internal surface of the shoulder 402, thus improving the rate of return of the tube .
• valves which are easier to produce in industrial conditions with high throughputs, and therefore less costly than the valves of pumps without return air, while fulfilling in most cases their "anti-return" role in a satisfactory manner.
• the bore of the tube head and the valve are provided with space-saving mutual fastening means which are easy to remove from the mold, which allows such tube heads to be produced economically at high speeds.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Closures For Containers (AREA)
• Quick-Acting Or Multi-Walled Pipe Joints (AREA)
• Check Valves (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=8866591

Family Applications (1)

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• 2001
  • 2001-08-17 FR FR0110892A patent/FR2828679B1/fr not_active Expired - Fee Related
• 2002
  • 2002-08-14 CA CA002461690A patent/CA2461690A1/fr not_active Abandoned
  • 2002-08-14 BR BR0205870-7A patent/BR0205870A/pt not_active Application Discontinuation
  • 2002-08-14 CN CN02816108.4A patent/CN1280156C/zh not_active Expired - Fee Related
  • 2002-08-14 PL PL02367839A patent/PL367839A1/xx unknown
  • 2002-08-14 WO PCT/FR2002/002877 patent/WO2003016159A2/fr not_active Application Discontinuation
  • 2002-08-14 RU RU2004107797/12A patent/RU2296088C2/ru not_active IP Right Cessation
  • 2002-08-14 MX MXPA03011250A patent/MXPA03011250A/es unknown
  • 2002-08-14 EP EP02777407A patent/EP1417134A2/de not_active Withdrawn
  • 2002-08-14 US US10/478,201 patent/US7222751B2/en not_active Expired - Fee Related

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