EP3366612B1 - Pistons pour cartouches - Google Patents

Pistons pour cartouches Download PDF

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Publication number
EP3366612B1
EP3366612B1 EP18158706.4A EP18158706A EP3366612B1 EP 3366612 B1 EP3366612 B1 EP 3366612B1 EP 18158706 A EP18158706 A EP 18158706A EP 3366612 B1 EP3366612 B1 EP 3366612B1
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EP
European Patent Office
Prior art keywords
piston
sealing lip
section
wall thickness
sidewall
Prior art date
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Application number
EP18158706.4A
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German (de)
English (en)
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EP3366612A1 (fr
Inventor
Achim Helmenstein
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.)
Fischbach KG Kunststoff Technik
Original Assignee
Fischbach KG Kunststoff Technik
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Publication date
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Priority to PL18158706T priority Critical patent/PL3366612T3/pl
Publication of EP3366612A1 publication Critical patent/EP3366612A1/fr
Application granted granted Critical
Publication of EP3366612B1 publication Critical patent/EP3366612B1/fr
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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
    • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container

Definitions

  • the present invention relates to a one-piece piston for cartridges for pressing out masses and a cartridge with such a piston.
  • Cartridges for squeezable compounds consist of a tubular cartridge body into which the compound is poured.
  • the cartridge body is closed at the front end and the mass is poured in from the open rear end.
  • the piston is then also inserted into the cartridge body from the rear end in order to seal it.
  • EP 2 108 599 B1 provides, in addition to the sealing lips, a protective edge which is rigid with respect to the sealing lips and which partially covers the lips in an axial projection.
  • the protective edge protects the flexible lips located behind against the mass in the cartridge and thus prevents the sealing lips from being folded over or damaged when the piston is set due to the mass being pressed against the sealing lips.
  • the previously known pistons have proven to be particularly advantageous, since when the piston is set, the excess air can advantageously escape and still seal the piston.
  • the sealing lips of such pistons are directed forwards and very good results are achieved when they are pressed out with a mechanical cartridge gun.
  • an increased pressure arises when it is seated in the space in front of the piston face, which drives out the air.
  • the compound presses against the sealing lips, the sealing lips being pressed outward against the cartridge wall due to the pressure, which results in an advantageous sealing.
  • compressed air can act directly on the cartridge piston. So that the cartridge piston is moved by the compressed air, there must be a pressure difference between the extrusion compound in the cartridge and the area arranged in or behind the piston, with a higher pressure prevailing in or behind the piston. As a result, the compressed air applied to the piston from behind can reach the gap between the side wall of the plunger and the cartridge and overcome the flexible sealing lips protruding forwards and thus reach the area of the mass that can be squeezed out.
  • the squeezable mass can on the one hand harden or spoil and air bubbles can arise in the squeezable mass, which lead to undesired interruptions of the extruded filling mass strand during the squeezing out process of the cartridge.
  • Such a piston is only advantageous for use with compressed air as a propulsion drive.
  • the rearward-facing sealing lips can easily be pushed to the side by filling compound due to the lack of pressure from the rear if the front-facing wiper lip fails.
  • the venting of this previously known cartridge piston is inadequate in some situations.
  • the invention is defined by the features of claim 1.
  • a circumferential first rear sealing projection is arranged on the rear wall section of the side wall, which has a maximum wall thickness D max1 that is greater than a minimum wall thickness d min of the side wall in the area between the forwardly protruding flexible sealing lip and the rear sealing projection arranged area of the rear wall section and / or in the area of the rear wall section arranged from the piston face behind the rear sealing projection.
  • the side wall also has at the end facing away from the piston face has an outwardly curved sealing section.
  • This sealing section forms a further seal against the compressed air acting on the piston from below when the piston is operated with the aid of a compressed air gun.
  • the outwardly bent sealing section can also develop a protective effect for the first sealing projection.
  • the maximum wall thickness is understood to mean the greatest wall thickness of a component, wherein the component can in principle have a changing wall thickness.
  • the minimum wall thickness is understood to mean the wall thickness of a component that is the smallest, whereby the component can in principle have a changing wall thickness.
  • the maximum wall thickness indicates the wall thickness of the “thickest point” of the component, whereas the minimum wall thickness denotes the wall thickness of the “thinnest section” of the component.
  • an extension is understood to be orthogonal to the neutral fiber of the corresponding component.
  • the wall thickness D max1 is measured either orthogonally to the neutral fiber or parallel to the side wall.
  • the inventive design of the rear wall section with a minimum wall thickness d min which is less than the maximum wall thickness D max1 of the rear sealing projection, ensures that the rear sealing projection is at least partially stiffer than the side wall in the wall section of the minimum wall thickness d min .
  • the side wall is therefore relatively flexible in the area of the minimum wall thickness d min , so that the side wall in the rear wall section can spread apart.
  • the side wall is preferably elastically deformable in the region of the minimum wall thickness d min .
  • the rear wall section with the minimum wall thickness d min is arranged between the forwardly protruding flexible sealing lip and the rear sealing projection, it is ensured that by spreading the side wall, the rear sealing projection is advantageously against the inner wall of the cartridge in which the Piston is inserted, is pressed.
  • the forwardly protruding flexible sealing lip effects an advantageous sealing of the piston with the cartridge when the mass is pressed out of the cartridge. Because the flexible sealing lip protrudes to the front, there is a between the flexible sealing lip and the side wall Formed pocket into which the squeezable mass can get, which thus presses the forwardly protruding flexible sealing lip in an advantageous manner sealingly against the inner wall of the cartridge.
  • the piston is preferably made of a plastic with a modulus of elasticity E 500 500 N / mm 2 , preferably E 300 300 N / mm 2 , measured according to ISO 178.
  • the plastic can be, for example, an LDPE.
  • the circumferential first rear sealing projection is a sealing lip which protrudes towards the rear.
  • a pressure pocket open to the rear is formed between the side wall and the sealing lip, so that the compressed air penetrating into the gap between the side wall of the piston and the cartridge presses into the pressure pocket and thus advantageously presses the sealing lip against the inner wall of the cartridge in a sealing manner.
  • air from the piston can advantageously press from above against the sealing lip, so that it is pushed away from the inner wall of the cartridge when the piston is set, and a venting path is thus created.
  • part of the sealing lip and, on the other hand, the side wall can deform.
  • the rear sealing lip is pressed against the inner wall of the cartridge by elastic deformation of the side wall at least in the area of the minimum wall thickness and can be supported by elastic deformation of at least individual sections of the sealing lip.
  • the side wall in front of the forwardly protruding flexible sealing lip has a circumferential or interrupted front protective edge which, in axial projection, covers a partial area of the at least one forwardly protruding flexible sealing lip.
  • the front protective edge is more rigid than the one protruding forward flexible sealing lip. It is relatively rigid and serves as a protective screen, so that when the piston is placed in the cartridge, the flexible sealing lip protruding forwards is protected.
  • the side wall has at least a first straight section with a first average wall thickness d1 and in the rear wall section a second straight section with a second average wall thickness d2, the second straight section extending from the piston face behind the first straight section and where: d 1 > d 2 .
  • the first straight section basically has a greater wall thickness than the second straight section.
  • a straight section is understood to mean a section of the piston which, when inserted into the cartridge, runs with its outer wall parallel to the cartridge wall.
  • Average wall thickness is understood to mean the wall thickness of a section, which is averaged over the length of the section.
  • the first straight section runs essentially parallel to the forwardly protruding flexible sealing lip.
  • the thinner straight section with the second wall thickness d2 in the rear wall section can be elastically deformed. It can be provided that the mean wall thickness d2 is greater than the minimum wall thickness d min or equal to the minimum wall thickness d min .
  • the side wall is elastically deformable in an advantageous manner in the entire second straight section and can be pressed outward by the applied compressed air in order to thus advantageously press the sealing projection against the inner wall of the cartridge.
  • Ribs for stiffening the piston can be provided directly below the front piston face and are connected to the side wall within the first straight section. At least part of the rear ends of the Ribs can lie in one plane so that a plate of an extrusion tool can rest against them.
  • first rear sealing projection is arranged on the second straight section or on the end of the side wall facing away from the piston face.
  • the front protective edge can be arranged in a first transition section of the side wall, which runs obliquely outward from the piston face and merges into the first straight section, the protective edge protruding laterally from the side wall.
  • the protective edge preferably protrudes laterally forwards from the side wall.
  • the side wall can have a second transition section which is arranged between the first and the second straight section, the second transition section having a wall thickness that decreases in the direction of the second straight section.
  • the second transition section can run obliquely outwards, so that the second straight section is a little further out than the first straight section.
  • the sealing projection is arranged on the second straight section, the result is that the second sealing projection only has to have a relatively small extension in the radial direction in order to reach the inside diameter of the cartridge. This ensures that the first rear sealing projection has sufficient rigidity to advantageously achieve a sealing effect by pressing the sealing projection against the inner wall of the cartridge, in that the rear wall section of the wall in particular is deformed.
  • the flexible sealing lip protruding forward is preferably arranged on the second transition section. Since this second transition section is a Has relatively high rigidity, it is ensured that a sealing effect takes place by flexible deformation of the flexible sealing lip and the side wall is almost not deformed in this section. This ensures that, for example, when the piston is set, the intended outer diameter of the forwardly protruding flexible sealing lip is not exceeded, so that the forwardly protruding flexible sealing lip can be inserted into the cartridge without hitting the rear edge of the cartridge wall.
  • the side wall has a circumferential edge protruding outwardly from the side wall, on which the forwardly protruding flexible sealing lip is arranged, with a second rear sealing lip also being arranged on the circumferential edge, which after protrudes at the back.
  • the outwardly protruding circumferential edge on the side wall increases the rigidity of the side wall in the area.
  • the fact that the forward protruding flexible sealing lip is arranged on the area of the side wall reinforced by the edge ensures that the side wall cannot be deformed in this area, so that the problem described above is avoided in a particularly advantageous manner .
  • the second rear sealing lip which is also arranged on the circumferential edge, seals the gap formed between the side wall and the inner wall of the cartridge against compressed air from behind. This serves as an additional seal to the rear.
  • the second rear sealing lip also ensures that compressed air, which passes the first rear sealing projection when the piston is moved, prevents it from pressing against the flexible sealing lip protruding forward.
  • a pocket is thus formed between the second rear sealing lip and the first rear sealing projection in which the compressed air passing through the first rear sealing projection is retained.
  • the retained compressed air has a higher pressure than the pressure acting from above against the flexible sealing lip protruding forwards.
  • the fact that the second rear sealing lip keeps the compressed air away prevents the after sealing lip protruding at the front can be pressed in and air can get into the mass that can be pressed out.
  • the design of the piston according to the invention with a circumferential edge protruding outwardly from the side wall, on which the forwardly protruding flexible sealing lip and a second rear sealing lip protruding to the rear are arranged also has independent inventive significance and is therefore also without a first rear one Sealing protrusion realizable.
  • Such a configuration of the piston can also be combined individually or jointly with all of the features described above.
  • the second rear sealing lip only seals against the compressed air acting from behind.
  • a pressure pocket is in turn formed, against which the compressed air acting from behind can press, whereby the sealing lip is advantageously pressed against the inner wall of the cartridge.
  • the second rear sealing lip can advantageously be pressed away from the inner wall in order to form a ventilation path.
  • the second rear sealing lip has a maximum wall thickness D max2 which is greater than the maximum wall thickness D max3 of the flexible sealing lip protruding forwards.
  • the second rear sealing lip has a higher rigidity than the forwardly protruding flexible sealing lip, the higher rigidity being further supported by the fact that the second rear sealing lip is made shorter than the forward protruding sealing lip.
  • the second rear sealing lip preferably has a length which is at most half the length of the flexible sealing lip protruding forwards. The length of the sealing lips is determined within the scope of the invention along the neutral fiber.
  • the side wall in the area of the circumferential edge has a maximum wall thickness D max4 encompassing the side wall and the circumferential edge, which is greater than the wall thickness of the rear wall section and the area of the side wall arranged between the piston face and the flexible sealing lip protruding at the front .
  • the side wall has a very large wall thickness in the area of the circumferential edge, which is measured including the circumferential edge, and thus an area with great rigidity, so that it is ensured that the side wall in this area where the second rear Sealing lip and the forwardly protruding flexible sealing lip is arranged, is not or is only very slightly deformed.
  • the front protective edge has at least one opening.
  • the opening ensures, on the one hand, the venting of the piston in an advantageous manner, in that the air can pass through the openings.
  • part of the squeezable mass can also pass through the opening and flow into the pocket formed between the side wall and the forwardly protruding flexible lip. The flexible sealing lip protruding forwards is then pressed outwards against the cartridge wall via the mass that can be pressed out.
  • the front protective edge preferably has a plurality of openings, preferably at least ten openings, the openings preferably being evenly spaced. It has been found that the provision of a large number of openings and thus a relatively large flow cross-section through which the squeezable compound can pass has the advantageous effect that the squeezable compound relatively quickly enters the flexible sealing lip protruding between the side wall and the forwardly protruding flexible sealing lip is pressed.
  • the pocket formed between the side wall and the forwardly protruding flexible sealing lip is completely or almost completely with the squeezable compound is filled, so that the squeezable mass in a particularly advantageous manner presses the forwardly protruding flexible sealing lip outward.
  • the uniform spacing ensures that the mass that can be pressed out relatively evenly gets into the pocket between the side wall and the forwardly protruding flexible sealing lip.
  • the flexible sealing lip protruding to the front has several passages.
  • the air flowing backwards can pass the forwardly protruding flexible sealing lip via the passages. This enables advantageous ventilation. It can also be provided that when the piston is set after venting, the mass that enters the pocket formed between the forwardly protruding flexible sealing lip and the side wall is pushed up to the passages and seals them.
  • the squeezable mass is squeezed out by means of the piston, due to the continuous pressure on the mass, it can even be pushed through the passages and into the between the forwardly protruding flexible sealing lip, the second rear sealing lip and the gap pocket formed by the cartridge wall arrive.
  • the mass located in the gap pocket produces a sealing effect against compressed air which may have passed the outwardly bent sealing section, the first rear sealing projection or the second rear sealing lip. This advantageously ensures that compressed air, which could possibly flow past the first rear sealing projection and / or the second rear sealing lip, cannot pass through the passages or the forwardly projecting sealing lip and get into the cartridge.
  • the mass in the gap pocket is stripped off the cartridge wall via the second rear sealing lip.
  • the passages preferably have a width and height that are matched to the viscosity of the compressible mass of the cartridge, so that at a given pressure and a given period of time, the mass can pass through the Passages is pushed through. It can also be provided that the passages have different dimensions. For example, part of the passages can have a greater width than a second part of the passages.
  • the second part of the passages can, for example, be adapted to the viscosity of the squeezable mass, so that when the squeezable mass is squeezed out, the latter is slowly penetrated by the latter and the squeezable mass reaches the gap pocket.
  • the first part of the passages can be at least partially pressed against the cartridge wall by the continuous pressure when the mass that can be pressed out, whereby a penetration of the mass through these passages is at least largely prevented.
  • a first number of the passages are offset in the circumferential direction with respect to the openings and a second number of the passages are arranged in an axial projection in the overlap area of the openings.
  • some of the passages have been arranged in the same circumferential area as the openings in the protective edge, whereas other passages are offset from the openings. It has been found that such an arrangement is advantageous in order to avoid air inclusions in the section between the protective edge and the forwardly protruding flexible sealing lip and in particular in the pocket formed between the forwardly protruding flexible sealing lip and the side wall, since the air the second sealing lip can pass very quickly when the piston is set.
  • the number of passages can be greater than three times, preferably five times the number of openings.
  • the perforations together with the cartridge wall as a whole have a lower flow resistance than that of the entirety of the passages together with the cartridge wall.
  • all openings taken together have a flow resistance which is smaller than the flow resistance formed by all passages together. Because the flow resistance of the passages is greater than that of the openings, the passages are relatively easily passed by the escaping air, but not by the mass when the piston is set. This is initially completely or almost completely retained by the passages.
  • the passages are provided in a beaded edge at the end of the forwardly protruding flexible sealing lip as beadless areas.
  • the fact that the passages are arranged at the free end of the forwardly protruding flexible sealing lip ensures that the mass first enters the pocket formed between the forwardly protruding flexible sealing lip and the side wall of the piston and, after it is almost completely filled, to the Passages entered and is retained by the passages.
  • the forwardly protruding flexible sealing lip must have a high degree of flexibility in order to be able to cling to the cartridge wall in a deforming manner even when the pressure is low.
  • the sealing lip is designed to be flexible in that it has a small wall thickness at least in partial areas, but at the same time also has the greatest possible length.
  • the flexible sealing lip protruding forward is preferably at least three times, better five times, particularly preferably at least eight times longer than the wall thickness at the thinnest point of the sealing lip.
  • the protective edge is always made more rigid than the flexible sealing lip protruding to the front and protects it.
  • the protective edge has more than 20% of the radial height of the forwardly protruding flexible sealing lip, better than 35%, particularly preferably more than 50% of the radial height of the forwardly protruding flexible sealing lip Sealing lip covered.
  • the protective edge covers at least 50%, better than 70%, particularly preferably more than 90% of the radial height of the forwardly protruding flexible sealing lip.
  • the front protective edge preferably has no contact with the inner wall of the cartridge, that is to say its diameter is thus smaller than that of the inner wall of the cartridge.
  • the sealing section has an average wall thickness d3 which corresponds to the wall thickness d2 of the second straight section or is greater.
  • the first rear sealing projection or the first rear sealing projection and the sealing section can also have a stripping function.
  • the first rear sealing projection or the first rear sealing projection and the sealing section are pressed tightly against the cartridge wall due to the pressure on the side wall, they can be stripped off in a particularly advantageous manner.
  • the first rear sealing projection and / or the second rear sealing lip can have an outer sealing surface which is designed as a polished surface.
  • the first rear sealing projection and / or the second rear sealing lip thus have a surface which rests sealingly on the inner wall of the cartridge.
  • the design as a polished surface enables a particularly advantageous sealing effect, since the polished surface can be placed particularly close to the inner wall of the cartridge.
  • the design of the first rear sealing projection and / or the second rear sealing lip with the exposed sealing surface also has the advantage that they are subject to less wear and, unlike sealing tips of sealing lips, are less susceptible to damage.
  • the outer sealing surface is preferably arched outwards, that is to say convex.
  • first rear sealing projection and the second rear sealing lip have the same or approximately the same diameter in the unloaded state.
  • first rear sealing projection or the second rear sealing lip and the outwardly bent sealing section have the same or approximately the same diameter in the unloaded state.
  • the forwardly protruding flexible sealing lip, the second rear sealing lip, the first rear sealing projection and the outwardly curved sealing section have the same or approximately the same diameter. Because these components or some of these components have the same diameter, the piston can advantageously roll on the outer circumference of these components. In the Feeding the piston to the cartridge, in order to insert the piston into the cartridge, it can thus be transported in an advantageous manner in a rolling manner. To insert the piston into the cartridge, the sealing lip protruding to the front, the first rear sealing projection and / or the outwardly curved sealing section are wetted with oil in order to ensure reliable sliding on the inner wall of the cartridge.
  • wetting with oil can take place by rolling them over a material soaked in oil, for example a felt. Furthermore, the same or approximately the same diameter ensures that the pistons do not tilt when rolling and can thus be reliably picked up by machine in order to be inserted into the cartridge.
  • approximately the same diameter is understood to mean that two components have a diameter difference of at most ⁇ 0.25 mm, preferably at most ⁇ 0.1 mm.
  • the invention also relates to a combination of a cartridge with a piston according to the invention.
  • the invention is particularly applicable to pistons with a rigid piston face.
  • cartridge pistons that have a so-called “membrane base”.
  • membrane base When the product is squeezed out of the cartridge, the diaphragm base turns outwards so that a piston face bulges forward.
  • the membrane base When the pressure on the cartridge piston is released, the membrane base is resiliently restored to its original shape, which means that the mass is sucked back into the cartridge so that dripping is prevented.
  • a one-piece piston 1 for cartridges 100 for pressing out masses from a cartridge is shown schematically in a perspective illustration.
  • the piston 1 has a front piston face 3 and a circumferential side wall 5. How best to look Fig. 2 can be seen, in which the piston 1 according to the invention is shown in a schematic sectional view in the state inserted in a cartridge 100, on the side wall 5 of the piston 1, starting from the piston face 3, initially a protective edge 9, a forwardly protruding flexible sealing lip 7, a second rear sealing lip 23, a first rear sealing projection 11 and an outwardly bent sealing section 25 are integrally formed.
  • the forwardly protruding flexible sealing lip 7, the first rear sealing projection 11, the second rear sealing lip 23 and the outwardly bent sealing section 25 abut the cartridge wall 102 in a sealing manner.
  • the protective edge 9 has a somewhat smaller diameter than the cartridge wall 102.
  • Ribs 14 extend from the piston face 3 in the rearward direction. The rear ends of at least a part of the ribs 14 are approximately in a plane against which the plate of an extrusion tool, not shown, can press the piston 1 in the Cartridge 100 advances.
  • a compressed air extrusion tool is used.
  • a higher pressure is generated by means of compressed air in the space 110 located in the piston and behind the piston than in the space 105 located in front of the piston 1 in the cartridge 100. This pressure difference causes the piston 1 to advance.
  • the side wall 5 of the piston 1 consists of several sections. Starting from the piston face 3, the side wall 5 initially runs in a first transition section 17. The protective edge 9 projects from the first transition section 17 to the side and is directed slightly forwards. The transition section 17 merges into a first straight wall section 13, the outside of which runs approximately parallel to the cartridge wall 102. The first straight wall section 13 also runs almost parallel to the forwardly protruding flexible sealing lip 7, so that a pocket 8 is formed between the first straight section 13 and the forwardly protruding flexible sealing lip 7.
  • the first straight wall section 13 merges into a second transition section 19, which connects the first straight wall section 13 to a second straight wall section 15, the outside of which runs approximately parallel to the cartridge wall 102.
  • the latter At the end of the side wall 5 facing away from the piston face 3, the latter has the sealing section 25 which is bent outward.
  • the side wall 5 has a circumferential edge 21.
  • the circumferential edge 21 forms the basis for the forwardly protruding flexible sealing lip 7 and the second rear sealing lip 23.
  • the forwardly protruding flexible sealing lip and the second rear sealing lip are arranged on the outwardly protruding circumferential edge 21. It is thereby achieved that the section of the side wall in which the flexible sealing lip 7 is arranged, has a particularly high rigidity, so that no or only a slight deformation of the side wall 5 occurs.
  • the first straight section 13 has a first average wall thickness d1.
  • the second straight section 15 has an average wall thickness d2.
  • the first rear sealing projection 11 which is embodied in the exemplary embodiment shown in the figures as a sealing lip protruding obliquely outward and rearward, is arranged on the second straight section 15.
  • the side wall has in the region of the second straight portion 15 a minimum wall thickness d min, said portion having the minimum thickness d min at least is in the region of the second straight portion 15 on which the piston chest 3 facing side of the first rear sealing projection 11 is arranged.
  • the piston 1 When the piston 1 is pressurized with compressed air, the compressed air hits the inside of the side wall 5 and presses the rear wall section of the side wall 5 outward, whereby the first rear sealing projection 11 is pressed against the cartridge wall 102. At the same time, the outwardly bent sealing section 25 is also pressed against the cartridge wall 102.
  • the protective edge 9 has openings 27. Furthermore, a bead 7a is arranged at its free end on the forwardly protruding flexible sealing lip 7, which has several passages 29.
  • the air in the space 105 in front of the piston 1 penetrates through the openings 27 of the protective edge 9 and over the outer edge of the protective edge 9 and reaches the area of the pocket 8. The air can forward through the passages 29 protruding flexible sealing lip 7 pass. Furthermore, when the piston is set, the air pushes the second rear sealing lip 23, the first rear sealing projection 11 and the outwardly bent sealing section 25 to the side and the desired ventilation can take place.
  • the piston Since the piston is set with a punch, there is no counter pressure from compressed air, so that the second rear sealing lip 23, the first rear sealing projection 11 and the outwardly curved sealing section 25 can be easily detached from the cartridge wall 102.
  • it can also be provided that it is inserted into the cartridge at an angle, that is, not axially parallel. This creates an enlarged flow path for the air on one side of the piston.
  • part of the mass penetrates through the openings 27 and fills the pockets 8 which are formed between the side wall 5 and the flexible sealing lip 7 protruding forward. These are gradually filled with compound until the compound reaches the bead 7a of the flexible sealing lip 7 protruding forwards.
  • the mass then at least partially fills the passages 29, whereby an additional sealing effect is achieved.
  • the compound arranged in the pocket 8 also presses the forwardly projecting flexible lip 7 outward, as a result of which it is pressed closer to the wall 102 of the cartridge 100.
  • the first rear sealing projection 11 and the second rear sealing lip 23 can strip off the mass located in the gap pocket 24 from the cartridge wall 102.
  • the first rear sealing projection 11 or the first rear sealing projection 11 and the outwardly curved sealing section 25 can also strip off material that may not have been completely stripped from the cartridge wall by the second rear sealing lip 23. Since the first rear sealing projection 11 and the sealing section 25 are pressed against the cartridge wall 102 due to the compressed air acting on the side wall 5, the first rear sealing projection 11 and the sealing section 25 can perform the stripping in a particularly advantageous manner.
  • the compressed air presses from the inside against the side wall 5 and presses at least the second straight section 15 outwards.
  • the first rear sealing projection 11 is pressed particularly firmly against the wall 102 of the cartridge 100.
  • air enters the gap between the outwardly curved sealing section 25 and the first front sealing projection 11, between the first rear sealing section 11 and the second rear sealing lip 23.
  • By pushing the side wall 15 outward through the inside against the Compressed air applied to the piston increases the pressure of the air in this gap.
  • small amounts of air from the compressed air can pass the outwardly bent sealing section 25 or the first rear sealing projection 11, for example through impurities in the cartridge or the like.
  • first rear sealing projection 11 is designed as a sealing lip that runs obliquely outwards to the rear and the second rear sealing lip also projects outwards and rearwards
  • pressure pockets 11b, 23b are formed on the rear side of the first rear sealing projection 11 and the second rear sealing lip 23 so that the air located in the above-described gaps presses against the first rear sealing projection 11 and the second rear sealing lip 23 and thus presses them more strongly against the cartridge wall 102, whereby an increased sealing effect is provided.
  • This largely prevents the air from being able to pass through the first rear sealing projection 11 and the second rear sealing lip 23. Air that is in the gap between the second rear sealing lip 23 and the forwardly protruding flexible sealing lip 7 is retained by the forwardly protruding flexible sealing lip 7 as well as the passages 29 that have meanwhile been filled with compound or the compound in the gap 24.
  • the first straight section 13 has a first mean wall thickness d1 which is greater than the mean wall thickness d2 of the second straight wall section 15.
  • the side wall 5 in the first transition section 17 and in the first straight section 13 has a relatively large wall thickness, since these parts come into contact with ground from the outside and the large wall thickness can prevent air from diffusing through the side wall.
  • the circumferential first rear sealing projection has a maximum wall thickness D max1 which is greater than the minimum wall thickness d min of the side wall in the rear wall section, in particular in the second straight section 15.
  • the second rear sealing lip 23 has a maximum wall thickness D max2 , which is greater than the maximum wall thickness D max3 of the forwardly protruding flexible sealing lip 7.
  • the outwardly curved sealing section 25 has a wall thickness d3 which corresponds to the mean wall thickness d2 of the second straight section 15.
  • the side wall 5 including the circumferential edge 21 has a maximum wall thickness D max4 , which is greater than the wall thickness of the rear section, which extends from the piston face 3 behind the forwardly protruding flexible sealing lip 7 and the is also larger than the area of the side wall 5 arranged between the piston face 3 and the forwardly protruding flexible sealing lip, which is essentially formed by the first transition section 17 and the first straight section 13.
  • D max4 maximum wall thickness
  • the side wall 5 has the greatest wall thickness in the area of the circumferential edge 21.
  • the wall thicknesses are measured orthogonally to the neutral fiber of the respective wall or lip.
  • the neutral fiber is shown schematically in the figures by a broken line.
  • the predetermined wall thickness ratios ensure that, on the one hand, an advantageous sealing effect of the rear sealing projection 11 due to the necessary stability of the first rear sealing projection 11 is achieved and on the other hand the necessary flexibility of the rear wall portion of the side wall 5 is given. Furthermore, it is achieved that the forwardly protruding flexible sealing lip 7 and the second rear sealing lip 23 are arranged in a particularly stable position of the side wall 5.
  • the second rear sealing lip 23 has an external sealing surface 23a which is designed as a polished surface.
  • the first rear sealing projection 11 also has an external sealing surface 11a which is designed as a polished surface.
  • the outwardly curved sealing section 25 can also have a sealing surface designed as a polished surface.
  • polished surfaces are provided as sealing surfaces 11a, 23a, whereby an improved sealing effect is achieved.
  • the sealing surfaces can be curved outward.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Compressor (AREA)
  • Coating Apparatus (AREA)

Claims (15)

  1. Piston d'une seule pièce (1) pour cartouches (100) destiné à presser des masses hors d'une cartouche (100), doté d'un poitrail de piston avant (3), d'une paroi latérale périphérique (5) et d'au moins une lèvre d'étanchéité flexible (7) agencée sur la paroi latérale (5) et faisant saillie vers l'avant, dans lequel la paroi latérale (5) comporte une section de paroi arrière, laquelle s'étend à partir du poitrail de piston (3) derrière la lèvre d'étanchéité flexible (7) faisant saillie vers l'avant, dans lequel sur la section de paroi arrière de la paroi latérale (5) est agencée une première protubérance d'étanchéité (11) arrière périphérique,
    caractérisé en ce que
    la première protubérance d'étanchéité (11) arrière périphérique possède une épaisseur de paroi maximale Dmax1,
    laquelle est supérieure à une épaisseur de paroi minimale dmin de la paroi latérale (5) dans la zone de la section de paroi arrière qui est agencée entre la lèvre d'étanchéité flexible (7) faisant saillie vers l'avant et la protubérance d'étanchéité (11) arrière.
  2. Piston selon la revendication 1, caractérisé en ce que
    l'épaisseur de paroi maximale est supérieure à une épaisseur de paroi minimale dmin de la paroi latérale (5) dans la zone de la section de paroi arrière qui est agencée derrière la protubérance d'étanchéité (11) arrière et s'étend depuis la poitrail de piston,
    dans lequel la paroi latérale (5) comporte à l'extrémité se détournant du poitrail de piston (3) une section d'étanchéité (25) recourbée vers l'extérieur.
  3. Piston selon la revendication 1 ou 2, caractérisé en ce que la première protubérance d'étanchéité (11) arrière périphérique est une lèvre d'étanchéité, laquelle fait saillie vers l'arrière.
  4. Piston selon l'une des revendications 1 à 3, caractérisé en ce que la paroi latérale (5) comporte devant la lèvre d'étanchéité flexible (7) faisant saillie vers l'avant une bordure protectrice (9) avant périphérique ou interrompue, laquelle couvre en projection axiale une zone partielle de l'au moins une lèvre d'étanchéité flexible (7) faisant saillie vers l'avant.
  5. Piston selon l'une des revendications 1 à 4, caractérisé en ce que la paroi latérale (5) comporte au moins une première section droite (13) avec une première épaisseur de paroi moyenne d1 et dans la section de paroi arrière une deuxième section droite (15) avec une deuxième épaisseur de paroi moyenne d2, dans lequel la deuxième section droite (15) s'étend derrière la première section droite (13) depuis le poitrail de piston (3) et dans lequel vaut : d1>d2.
  6. Piston selon la revendication 5, caractérisé en ce que la première protubérance d'étanchéité (11) arrière est agencée sur la deuxième section droite (15).
  7. Piston selon la revendication 5 ou 6, caractérisé en ce que la bordure protectrice avant (9) est agencée sur une première section de passage (17) de la paroi latérale (5), laquelle s'étend obliquement vers l'extérieur depuis le poitrail de piston (3) et fait saillie dans la première section droite (13), dans lequel la bordure protectrice (9) fait saillie latéralement de la paroi latérale (5).
  8. Piston selon l'une des revendications 5 à 7, caractérisé en ce que la paroi latérale (5) comporte une deuxième section de passage (19), laquelle est agencée entre la première et la deuxième section droite (13, 15), dans lequel la deuxième section de passage (19) présente une épaisseur de paroi décroissant dans la direction de la deuxième section droite (15).
  9. Piston selon le terme général de la revendication 1 ou l'une des revendications 1-7, caractérisé en ce que la paroi latérale (5) comporte une bordure périphérique (21) dépassant de la paroi latérale (5) vers l'extérieur, sur laquelle est agencée la lèvre d'étanchéité flexible (7) faisant saillie vers l'avant, dans lequel est en outre agencée sur la bordure périphérique (21) une deuxième lèvre d'étanchéité arrière (23), laquelle fait saillie vers l'arrière.
  10. Piston selon la revendication 9, caractérisé en ce que la deuxième lèvre d'étanchéité arrière (23) possède une épaisseur de paroi maximale Dmax2, laquelle est supérieure à l'épaisseur de paroi maximale Dmax3 de la lèvre d'étanchéité flexible (7) faisant saillie vers l'avant.
  11. Piston selon la revendication 9 ou 10, caractérisé en ce que la paroi latérale (5) présente dans la zone de la bordure périphérique (21) une épaisseur de paroi maximale Dmax4 comprenant la paroi latérale (5) et la bordure périphérique (21), laquelle est supérieure aux épaisseurs de paroi de la section de paroi arrière et de la section de la paroi latérale (5) agencée entre le poitrail de piston (3) et la lèvre d'étanchéité flexible (7) faisant saillie vers l'avant.
  12. Piston selon l'une des revendications 4-11, caractérisé en ce que la bordure protectrice avant (9) comporte au moins une découpe (27) ou en ce que la bordure protectrice avant (9) comporte plusieurs découpes (27), de préférence au moins 10 découpes (27), dans lequel les découpes (27) sont uniformément espacées.
  13. Piston selon l'une des revendications 1 à 12, caractérisé en ce que la lèvre d'étanchéité flexible (7) faisant saillie vers l'avant comporte plusieurs passages (29), dans lequel de préférence un premier nombre des passages (29) est décalé dans la direction périphérique par rapport aux découpes (27) et un deuxième nombre des passages (29) est agencé dans la zone de couverture des découpes (27) en projection axiale.
  14. Piston selon l'une des revendications 1 à 13, caractérisé en ce que la section d'étanchéité (25) recourbée vers l'avant présente une épaisseur de paroi moyenne d3, laquelle correspond à l'épaisseur de paroi moyenne d2 de la deuxième section droite (15) ou est supérieure à celle-ci.
  15. Piston selon l'une des revendications 1 à 14, caractérisé en ce que la première protubérance d'étanchéité (11) arrière et/ou la deuxième lèvre d'étanchéité (23) arrière comporte une surface étanche externe (11a, 23a), laquelle est réalisée comme surface polie.
EP18158706.4A 2017-02-28 2018-02-26 Pistons pour cartouches Active EP3366612B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18158706T PL3366612T3 (pl) 2017-02-28 2018-02-26 Tłok do kartuszy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017203241.3A DE102017203241A1 (de) 2017-02-28 2017-02-28 Kolben für Kartuschen

Publications (2)

Publication Number Publication Date
EP3366612A1 EP3366612A1 (fr) 2018-08-29
EP3366612B1 true EP3366612B1 (fr) 2020-08-12

Family

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Application Number Title Priority Date Filing Date
EP18158706.4A Active EP3366612B1 (fr) 2017-02-28 2018-02-26 Pistons pour cartouches

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EP (1) EP3366612B1 (fr)
DE (1) DE102017203241A1 (fr)
ES (1) ES2836531T3 (fr)
PL (1) PL3366612T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3632575A1 (fr) * 2018-10-02 2020-04-08 Sulzer Mixpac AG Piston de cartouche réutilisable
DE102021108642A1 (de) 2021-04-07 2022-10-13 Ritter Gmbh Nachlaufender Kolben mit Stützlippe
IT202200007898A1 (it) * 2022-04-21 2023-10-21 De Longhi Appliances Srl Tramoggia a tenuta ermetica per alimentare chicchi e relativo procedimento di funzionamento

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Publication number Priority date Publication date Assignee Title
DE3005855A1 (de) 1980-02-16 1981-08-20 Alfred Fischbach Kg Kunststoff-Spritzgusswerk, 5250 Engelskirchen Bodenverschluss fuer einen hohlzylindrischen strangpressbehaelter
US4852772A (en) 1987-12-07 1989-08-01 Genesis Industries, Incorporated Dispenser for viscous fluids
EP0497739B1 (fr) 1991-01-29 1996-10-09 Wilhelm A. Keller Cartouche de décharge avec cylindre de réserve et piston de convoyage
EP0782886B1 (fr) 1996-01-03 2002-03-06 Dow Automotive AG Dispositif pour appliquer des produits pâteux
EP1461268A4 (fr) * 2001-12-10 2009-03-25 Tah Ind Inc Cartouche de distribution avec circuit d'aeration sinueux
DE20319464U1 (de) * 2002-12-10 2004-04-22 Topic, Anton Kolben für eine Kartusche zum Aufbewahren und Auspressen von pastösen Substanzen und Kartusche mit demselben
DE102006017408A1 (de) 2006-04-13 2007-10-18 Fischbach Kg Kunststoff-Technik Kartusche für auspressbare Massen
ATE474794T1 (de) 2006-04-13 2010-08-15 Fischbach Kg Kunststoff Techni Kartusche für auspressbare massen
DE202008005097U1 (de) 2008-04-12 2009-10-29 Fischbach Kg Kunststoff-Technik Kartuschenkolben
US8235255B2 (en) 2008-07-02 2012-08-07 Nordson Corporation Pistons with a lip seal and cartridge systems using such pistons
EP2509718B1 (fr) 2009-12-11 2016-11-30 Sulzer Mixpac AG Piston à cartouche
DE102010048062B4 (de) * 2010-06-22 2018-08-23 Fischbach Kg Kunststoff-Technik Kartuschenkolben

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Also Published As

Publication number Publication date
PL3366612T3 (pl) 2021-04-06
ES2836531T3 (es) 2021-06-25
EP3366612A1 (fr) 2018-08-29
DE102017203241A1 (de) 2018-08-30

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