EP3366612A1 - Pistons pour cartouches - Google Patents

Pistons pour cartouches Download PDF

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Publication number
EP3366612A1
EP3366612A1 EP18158706.4A EP18158706A EP3366612A1 EP 3366612 A1 EP3366612 A1 EP 3366612A1 EP 18158706 A EP18158706 A EP 18158706A EP 3366612 A1 EP3366612 A1 EP 3366612A1
Authority
EP
European Patent Office
Prior art keywords
piston
side wall
sealing lip
wall
cartridge
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.)
Granted
Application number
EP18158706.4A
Other languages
German (de)
English (en)
Other versions
EP3366612B1 (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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fischbach KG Kunststoff Technik filed Critical Fischbach KG Kunststoff Technik
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
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B65D83/76—Containers or packages with special means for dispensing contents for dispensing fluent contents by means of a piston

Definitions

  • the present invention relates to a one-piece piston for cartridges for pressing masses and a cartridge with such piston.
  • Cartridges for auspressbare masses consist of a tubular cartridge body, in which the mass is filled.
  • the cartridge body is closed at the front end and the filling of the mass takes place from the open rear end. Subsequently, the piston is also inserted from the rear end into the cartridge body to seal it.
  • EP 2 108 599 B1 (Fischbach ) provides, in addition to the sealing lips, a protective edge which is rigid with respect to the sealing lips and partially covers the lips in axial projection. Due to the protective edge, the flexible lips located there are protected from the mass located in the cartridge, and thus folding over or damaging of the sealing lips during piston setting due to mass that is pressed against the sealing lips is avoided.
  • the prior art pistons have been found to be particularly advantageous, since when setting the piston, the excess air can escape in an advantageous manner and still seal the piston sealing.
  • the sealing lips are directed at such piston forward and when pressing with a mechanical caulking gun very good results are achieved.
  • an increased pressure which expels the air.
  • the mass presses against the sealing lips, wherein the sealing lips are pressed due to the pressure to the outside against the cartridge wall, whereby an advantageous sealing takes place.
  • the invention is defined by the features of claim 1.
  • a circumferential first rear sealing projection is arranged, which has a maximum wall thickness D max1 , which is greater than a minimum wall thickness d min of the side wall in the between forward projecting flexible sealing lip and the rear sealing projection arranged portion of the rear wall portion and / or arranged in the starting of the piston breast behind the rear sealing projection portion of the rear wall portion.
  • the largest wall thickness of a component wherein the component can basically have a varying wall thickness.
  • minimal wall thickness is understood to mean the wall thickness of a component that is the lowest, wherein the component can basically have a varying 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 portion" of the component.
  • an extension orthogonal to the neutral fiber of the corresponding component is understood within the scope of the invention.
  • the wall thickness D max1 is measured either orthogonally to the neutral fiber or parallel to the side wall.
  • the rear wall portion with a minimum wall thickness d min which is less than maximum wall thickness D max1 of the rear sealing projection is achieved that the rear sealing projection is at least partially stiffer than the side wall in the wall portion of the minimum wall thickness d min .
  • the side wall is thus relatively flexible in the region of the minimum wall thickness d min , so that a spreading of the side wall in the rear wall section can occur.
  • the side wall is elastically deformable in the region of the minimum wall thickness d min .
  • the region of the rear wall section with the minimum wall thickness d min is arranged between the forwardly projecting flexible sealing lip and the rear sealing projection, it is ensured that the spreading of the side wall of the rear sealing projection in an advantageous manner against the inner wall of the cartridge in which Piston is inserted, is pressed.
  • the forwardly projecting flexible sealing lip effects an advantageous sealing of the piston with the cartridge when the mass is pressed out of the cartridge.
  • the design of the rear wall section of the side wall with the first rear sealing projection ensures that, when compressed air is applied, there is a good seal against the compressed air entering the gap between the cartridge inner wall and the side wall of the piston.
  • the piston is made of a plastic having a modulus of elasticity E ⁇ 500 N / mm 2 , preferably E ⁇ 300 N / mm 2 , measured according to ISO 178.
  • the plastic may be, for example, an LDPE.
  • the circumferential first rear sealing projection is a sealing lip which protrudes to the rear.
  • a pressure bag open to the rear between the side wall and the sealing lip is formed, so that the compressed air entering into the gap between the side wall of the piston and the cartridge presses into the pressure pocket and thus sealingly presses the sealing lip against the inner wall of the cartridge in an advantageous manner.
  • air from the piston can advantageously be pressed 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 thus a venting path is created.
  • a part of the sealing lip and on the other hand also deform the side wall.
  • the pressing of the rear sealing lip on the inner wall of the cartridge is effected by an elastic deformation of the side wall at least in the region of the minimum wall thickness and can be supported by an elastic deformation at least a portion of the sealing lip.
  • the side wall in front of the forwardly projecting flexible sealing lip has a circumferential or interrupted front protective edge, which covers in axial projection a portion of the at least one forward projecting flexible sealing lip.
  • the front protective edge has a greater rigidity than the front protruding flexible sealing lip. It is relatively rigid and serves as a protective shield, so that when a set of the piston in the cartridge, the forward projecting flexible sealing lip is protected.
  • the side wall has at least a first straight section with a first middle wall thickness d1 and in the rear wall section a second straight section with a second middle wall thickness d2, the second straight section extending from the piston chest 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, in the state inserted into the cartridge, runs with its outer wall parallel to the cartridge wall.
  • medium wall thickness is meant the wall thickness of a section averaged over the length of the section.
  • the first straight section is substantially parallel to the forward projecting flexible sealing lip.
  • the piston in this area has a high rigidity and deformation of the side wall is prevented.
  • the thinner straight portion with the second wall thickness d2 in the rear wall portion can be elastically deformed. It can be provided that the average 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 in the entire second straight portion advantageously elastically deformable and can be pressed by applied compressed air to the outside, so as to press the sealing projection to the inner wall of the cartridge in an advantageous manner.
  • the front piston breast ribs may be provided for stiffening the piston, which are connected within the first straight portion with the side wall. At least part of the rear ends of the Ribs can lie in one plane, so that a plate of a Auspresstechnikmaschines can rest against them.
  • the first rear sealing projection is arranged on the second straight portion or on the side facing away from the piston breast end of the side wall.
  • the front guard edge may be disposed in a first transitional portion of the sidewall extending obliquely outwardly from the piston breast and merging into the first straight portion, the guard edge projecting laterally from the sidewall.
  • the protective edge projects laterally forward from the side wall.
  • the sidewall may include a second transition section disposed between the first and second straight sections, the second transition section having a wall thickness decreasing in the direction of the second straight section.
  • the second transition section may extend obliquely outward so that the second straight section is located slightly farther outboard than the first straight section.
  • the sealing projection is arranged on the second straight section, this is achieved in that the second sealing projection in the radial direction only has to have a relatively small extent in order to reach the inner 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 on the inner wall of the cartridge, in particular by deforming the rear wall portion of the wall.
  • the forwardly projecting flexible sealing lip is arranged on the second transition section. Since this second transition section a has relatively high rigidity, it is ensured that a sealing effect is carried out by a flexible deformation of the flexible sealing lip and the side wall is almost not deformed in this section. This ensures that, for example, when setting the piston of the intended outer diameter of the forward projecting flexible sealing lip is not exceeded, so that the forward projecting flexible sealing lip can be inserted into the cartridge without bumping against the rear edge of the Kartuschenwandung.
  • the side wall has a peripheral edge projecting outwardly from the side wall, on which the forwardly projecting flexible sealing lip is arranged, wherein on the peripheral edge, a second rear sealing lip is further arranged according to protrudes behind.
  • the outwardly projecting peripheral edge on the side wall increases the rigidity of the side wall in the area.
  • the fact that the forwardly projecting flexible sealing lip is arranged on the area of the side wall reinforced by the edge ensures that deformation of the side wall in this area can not occur, so that the problem described above is avoided in a particularly advantageous manner
  • the arranged on the peripheral edge also second rear sealing lip seals the gap formed between the side wall and the inner wall of the cartridge against compressed air from behind.
  • the embodiment of the piston according to the invention with an outwardly projecting from the side wall peripheral edge on which the forwardly projecting flexible sealing lip and a second rear sealing lip, which protrudes to the rear, also has independent inventive importance and is therefore without first rear Sealing projection feasible.
  • Such a configuration of the piston can furthermore be combined individually or jointly with all the features described above.
  • the second rear sealing lip causes a sole seal against the compressed air acting from behind.
  • a pressure pocket is again formed by the protrusion to the rear of the second rear lip, against which can press the compressed air acting from behind, whereby the sealing lip is pressed in an advantageous manner against the inner wall of the cartridge.
  • the second rear sealing lip can advantageously be pushed away from the inner wall in order to form a venting 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 forwardly projecting flexible sealing lip.
  • the second rear sealing lip has a higher rigidity than the forward projecting flexible sealing lip, wherein the higher stiffness is further supported by the fact that the second rear sealing lip is formed shorter than the projecting forward sealing lip.
  • the second rear sealing lip has a length which has a maximum of half the length of the forwardly projecting flexible sealing lip. The length of the sealing lips is determined in the context of the invention along the neutral fiber.
  • the side wall in the region of the peripheral edge has a maximum wall thickness D max4 encompassing the side wall and the peripheral edge which is greater than the wall thicknesses of the rear wall section and the region of the side wall arranged between the piston breast and the front projecting flexible sealing lip ,
  • the side wall has in the area of the peripheral edge of a very large wall thickness, which is measured including the peripheral edge, and thus an area with high rigidity, so as to ensure that the side wall in this area, at which the second rear Sealing lip and the projecting forward flexible sealing lip is arranged, is not or only slightly deformed.
  • the front protective edge has at least one opening.
  • the opening on the one hand advantageously the venting of the piston is ensured by the air can pass through the openings.
  • a portion of the extrudable mass may also pass through the aperture and flow into the pocket formed between the sidewall and the forwardly projecting flexible lip. About the auspressbare mass the forward projecting flexible sealing lip is then pressed outwards against the cartridge wall.
  • the front protective edge has a plurality of openings, preferably at least ten openings, wherein the openings are preferably evenly spaced. It has been found that the provision of a plurality of openings and thus a relatively large flow cross section, through which the squeezable mass can pass, has the advantageous effect that the squeezable mass relatively quickly in between the side wall and the front projecting flexible sealing lip is pressed.
  • the pocket formed between the side wall and the forward projecting flexible sealing lip completely or almost completely with the auspressbaren mass is filled, so that the auspressbare mass presses in a particularly advantageous manner, the forward projecting flexible sealing lip to the outside.
  • the uniform spacing ensures that relatively evenly compressible mass passes into the pocket between the side wall and the forward projecting flexible sealing lip.
  • the forwardly projecting flexible sealing lip has a plurality of passages. Through the passages, when the piston is set, the air flowing backwards can pass the flexible sealing lip protruding forwards. As a result, an advantageous venting is possible. It can also be provided that when setting the piston after venting mass that enters the bag formed between the projecting forward flexible sealing lip and the side wall, is also pushed to the passages and seals them. In the subsequent use of the cartridge in which the auspressbare mass is expressed by the piston, due to the continuous pressure on the mass, they can even be pushed through the passages and in between the forward projecting flexible sealing lip, the second rear sealing lip and enter the gap wall formed by the cartridge wall.
  • the mass in the gap pocket causes a sealing effect against compressed air, which has possibly passed the outwardly bent sealing portion, the first rear sealing projection and the second rear sealing lip.
  • compressed air which could optionally flow past the first rear sealing projection and / or the second rear sealing lip, can not pass through the passages or the sealing lip projecting forward and can enter 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 adapted to the viscosity of the extrudable mass of the cartridge, so that at a predetermined pressure and a predetermined period of time, the mass passes through the Passages is pushed through. It can also be provided that the passages have different dimensions. For example, a portion of the passages may have a greater width than a second portion of the passages.
  • the second part of the passages can be adapted, for example, to the viscosity of the extrudable mass, so that they are slowly penetrated by the extrudable mass when it is pressed out, and the extrudable mass passes into the gap pocket.
  • the first part of the passages can be pressed at least partially against the cartridge wall by the continuous pressure during extrusion of the extrudable mass, whereby a penetration of the mass through these passages is at least largely prevented.
  • a first number of the passages are offset relative to the openings in the circumferential direction and a second number of the passages is arranged in the axial projection in the overlapping region of the openings.
  • some of the passages have been arranged in the same circumferential region as the apertures in the protective edge, whereas other passages are offset from the apertures. It has been found that such an arrangement is advantageous in order to avoid air pockets in the portion between the protective edge and the forward projecting flexible sealing lip and in particular in the formed between the forwardly projecting flexible sealing lip and the side wall pocket, as the air when setting the piston can very quickly pass the second sealing lip.
  • a large number of passages are provided on the protruding therefrom flexible sealing lip compared to the number of openings.
  • the number of passages greater than three times may preferably be five times the number of passages.
  • the openings together with the Kartuschenwandung in their entirety have a lower flow resistance than that of the entirety of the passages together with the Kartuschenwandung.
  • all the apertures taken together have a flow resistance which is smaller than the flow resistance formed together by all the passages.
  • the flow resistance of the passages is greater than that of the openings, the passages of the escaping air are relatively easily passed, but not when setting the piston from the mass. 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 projecting flexible sealing lip as beadless areas.
  • the fact that the passages are arranged at the free end of the forward projecting flexible sealing lip it is ensured that first the mass passes into the pocket formed between the forward projecting flexible sealing lip and the side wall of the piston and after this is almost completely filled to the Passages and retained by the passages.
  • the flexible sealing lip projecting forward must have a high degree of flexibility in order to be able to conform to the cartridge wall in a deforming manner, even at low pressures.
  • the sealing lip is designed so flexible by having at least in some areas a small Wanddike, but at the same time has the greatest possible length.
  • the forwardly projecting flexible sealing lip is at least three times, better five times, more preferably at least eight times longer than the wall thickness at the thinnest point of the sealing lip.
  • a protective edge sealing lip given is in any case made more rigid than the forward projecting flexible sealing lip and protects it.
  • the protective edge in the non-inserted state of the piston in the cartridge, the protective edge more than 20% of the radial height of the forward projecting flexible sealing lip, better more than 35%, more preferably more than 50% of the radial height of the forward projecting flexible Sealing lip covered.
  • the protective edge covers at least 50%, better more than 70%, particularly preferably more than 90% of the radial height of the forwardly projecting 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 smaller than that of the inner wall of the cartridge.
  • the side wall has an outwardly bent sealing section at the end facing away from the piston breast.
  • This sealing portion forms another seal against the pressurized air from below on the piston when the piston is operated by means of a compressed air gun.
  • the outwardly bent sealing portion can also develop a protective effect for the first sealing projection.
  • the sealing portion has an average wall thickness d3, which corresponds to the wall thickness d2 of the second straight portion or is larger.
  • the first rear sealing projection or the first rear sealing projection and the sealing portion may also have a Abstreiffunktion.
  • the first rear sealing projection or the first rear sealing projection and the sealing portion due to the pressure on the side wall are pressed tightly against the cartridge wall, they can perform stripping in a particularly advantageous manner.
  • the first rear sealing projection and / or the second rear sealing lip may have an outer sealing surface, which is formed as a polished surface.
  • the first rear sealing projection and / or the second rear sealing lip thus have a surface which bears sealingly against the cartridge inner wall. Due to the design as a polished surface, a particularly advantageous sealing effect is possible because the polished surface can be applied particularly tightly against the cartridge inner wall.
  • the design of the first rear sealing projection and / or the second rear sealing lip with the exposed sealing surface has the additional advantage that they are subject to less wear and unlike sealing tips of sealing lips are less prone to damage.
  • the outer sealing surface is curved outward, that is convex.
  • first rear sealing projection and the second rear sealing lip have an unloaded state same or approximately the same diameter.
  • first rear sealing projection or the second rear sealing lip and the outwardly bent sealing section have an unloaded state same or approximately the same diameter.
  • the forwardly projecting flexible sealing lip, the second rear sealing lip, the first rear sealing projection and the outwardly bent sealing portion have the same or approximately the same diameter.
  • the piston can roll on the outer periphery of these components in an advantageous manner. In the Supplying the piston to the cartridge to insert the piston into the cartridge, this can thus be transported advantageously rolling.
  • the forwardly projecting sealing lip, the first rear sealing projection and / or the outwardly bent sealing section are moistened with oil in order to ensure reliable sliding on the inner wall of the cartridge.
  • the wetting with oil can be done by rolling them over an oil-soaked cloth, such as a felt. Further, the same or approximately equal diameter ensures that the pistons do not tilt during rolling and thus can be reliably machine-mounted to be inserted into the cartridge.
  • approximately the same diameter is understood to mean that two components have a diameter difference of a maximum of ⁇ 0.25 mm, preferably a maximum of ⁇ 0.1 mm.
  • the invention further relates to a combination of a cartridge with a piston according to the invention.
  • the invention is particularly applicable to pistons with rigid piston breast.
  • cartridge pistons which have a so-called “membrane bottom”.
  • the membrane bottom swings outward so that a piston breast bulges out to the front.
  • the membrane bottom forms elastically back to its original shape, thereby the mass is sucked back into the cartridge, so that dripping is prevented.
  • Fig. 1 is a one-piece piston 1 for cartridges 100 for expressing masses of a cartridge shown schematically in a perspective view.
  • the piston 1 has a front piston breast 3 and a circumferential side wall 5. How best Fig. 2 can be seen, in which the piston 1 according to the invention is shown in a schematic sectional view in the inserted state in a cartridge 100, on the side wall 5 of the piston 1, starting from the piston breast 3, first a protective edge 9, a forward projecting flexible sealing lip 7, a second rear sealing lip 23, a first rear sealing projection 11 and an outwardly bent sealing portion 25 integrally formed.
  • the forward projecting flexible sealing lip 7, the first rear sealing projection 11, the second rear sealing lip 23 and the outwardly bent sealing portion 25 are sealingly against the cartridge 102.
  • the protective edge 9 has a slightly smaller diameter than the cartridge wall 102.
  • ribs 14 extend in the rearward direction. The rear ends of at least a portion of the ribs 14 are approximately in a plane against which the plate of a Auspresstechnikmaschines not shown, which press the piston 1 in the Cartridge 100 advances. Alternatively it can be provided that a Druckluftauspresstechnikmaschinemaschine is used. For this purpose, a higher pressure is generated in the space 110 located in the piston and behind the piston by means of compressed air than in the space 105 located in front of the piston 1 in the cartridge 100. By this pressure difference, a propulsion of the piston 1 is effected.
  • Fig. 3 in which the side wall 5 of the piston 1 according to the invention is shown schematically in an enlarged sectional view, the side wall 5 consists of several sections. Starting from the piston breast 3, the side wall 5 initially extends in a first transition section 17. From the first transition section 17 of the protective edge 9 is laterally and slightly directed forward. 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 further extends almost parallel to the forwardly projecting flexible sealing lip 7, so that between the first straight section 13 and the forwardly projecting flexible sealing lip 7 a pocket 8 is formed.
  • 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. At the end remote from the piston breast 3 end of the side wall 5, this has the outwardly bent sealing portion 25.
  • the side wall 5 has a peripheral edge 21.
  • the peripheral edge 21 forms the basis for the forwardly projecting flexible sealing lip 7 and the second rear sealing lip 23.
  • the forward projecting flexible sealing lip and the second rear sealing lip are arranged on the outwardly projecting peripheral edge 21. This ensures that the portion of the side wall by the forward projecting flexible sealing lip. 7 is arranged, has a particularly high rigidity, so that no or only a small deformation of the side wall 5 takes place.
  • 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 formed in the embodiment illustrated in the figures as an obliquely outwardly and rearwardly projecting sealing lip, 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, where the portion with the minimum thickness d min at least in the region of the second straight portion 15 is formed on the piston chest 3 facing side of the first rear sealing projection 11 is arranged.
  • Fig. 4 shows, the protective edge 9 openings 27. Further, a bead 7a is disposed at the free end projecting to the front of the flexible sealing lip 7, which has a plurality of passages 29.
  • the air located 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 enters the region of the pocket 8. Through the passages 29, the air can forward pass the protruding flexible sealing lip 7. Further, when the piston is set, the air pushes the second rear seal lip 23, the first rear seal protrusion 11, and the outward bent seal portion 25 to the side, and the desired ventilation can be performed.
  • the mass penetrates through the openings 27 and fills the pockets 8, which is formed between the side wall 5 and the forwardly projecting flexible sealing lip 7. These are gradually filled with mass until the mass reaches the bead 7a of the forward projecting flexible sealing lip 7. The mass then at least partially fills the passages 29, whereby an additional sealing effect is achieved.
  • the mass disposed in the pocket 8 also pushes the forwardly projecting flexible lip 7 outwardly, thereby forcing it closer to the wall 102 of the cartridge 100.
  • the cartridge in which the mass is squeezed out due to the continuous pressure on the mass, it may even partially flow through the passages 29 and fill the between the forward projecting flexible sealing lip 7, the second rear sealing lip 23 and the cartridge wall This results in a further seal, so that possibly in use with compressed air, the outwardly bent sealing portion 25, the first rear sealing projection 11 and the second rear sealing lip 23 passing compressed air is held by the mass located in the gap pocket 24.
  • the second rear sealing lip 23 may strip the mass 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 bent sealing section 25 can also strip off mass that may not have been completely stripped off the second rear sealing lip 23 from the cartridge wall. Since the first rear sealing protrusion 11 and the sealing portion 25 are pressed against the cartridge wall 102 due to the compressed air applied to the side wall 5, the first rear sealing protrusion 11 and the sealing portion 25 can perform stripping in a particularly advantageous manner.
  • the compressed air presses against the side wall 5 from the inside and pushes 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 bent sealing portion 25 and the first front sealing projection 11, between the first rear sealing portion 11 and the second rear sealing lip 23.
  • the pressure of the air is increased in this gap.
  • small amounts of air of the compressed air may pass the outwardly bent sealing portion 25 or the first rear sealing protrusion 11, for example, by impurities in the cartridge or the like.
  • first rear sealing projection 11 is formed as an obliquely outwardly extending rearward sealing lip and the second rear sealing lip also protruding outward rearward
  • 23 pressure pockets 11b, 23b are formed on the rear side of the first rear sealing projection 11 and the second rear sealing lip in that the air in the previously described gaps pushes against the first rear sealing projection 11 and the second rearward sealing lip 23 and thus presses them more strongly against the cartridge walls 102, which gives an increased sealing effect.
  • This largely prevents the air from passing through the first rear sealing projection 11 and the second rear sealing lip 23.
  • Air, which is located in the gap between the second rear sealing lip 23 and the forward projecting flexible sealing lip 7 is retained by the forward flexible sealing lip 7 and the intermittently filled with mass passages 29 and located in the gap 24 mass.
  • the first straight section 13 has a first average wall thickness d1, which is greater than the average wall thickness d2 of the second straight wall section 15.
  • the side wall 5 in the first transition section 17 and the first straight section 13 has a relatively large wall thickness, since these parts come into contact with the outside 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 protruding forward flexible sealing lip 7.
  • the bent outward sealing portion 25 has a wall thickness d3, which corresponds to the average wall thickness d2 of the second straight portion 15.
  • the side wall 5 including the peripheral edge 21 a maximum wall thickness D max4 , which is greater than the wall thicknesses of the rear portion extending from the piston breast 3 behind the projecting forward flexible sealing lip 7 and the is also greater than the between the piston breast 3 and the forward projecting flexible sealing lip arranged portion of the side wall 5, which is formed essentially by the first transition portion 17 and the first straight portion 13.
  • the side wall 5 has in the region of the peripheral edge 21, the largest wall thickness.
  • the wall thicknesses are measured orthogonal 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 by the necessary stability of the first rear sealing projection 11th is reached 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 projecting flexible sealing lip 7 and the second rear sealing lip 23 are arranged at a particularly stable position of the side wall 5.
  • the second rear sealing lip 23 has an outer sealing surface 23a, which is formed as a polished surface.
  • the first rear sealing projection 11 also has an outer sealing surface 11a, which is formed as a polished surface.
  • the outwardly bent sealing section 25 may 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 may be curved outwardly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Coating Apparatus (AREA)
  • Compressor (AREA)
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 true EP3366612A1 (fr) 2018-08-29
EP3366612B1 EP3366612B1 (fr) 2020-08-12

Family

ID=61521312

Family Applications (1)

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

Country Status (4)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112752619A (zh) * 2018-10-02 2021-05-04 苏尔寿混合技术有限公司 可重复使用的料筒活塞
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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DE102021108642A1 (de) 2021-04-07 2022-10-13 Ritter Gmbh Nachlaufender Kolben mit Stützlippe

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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
EP2108599A1 (fr) * 2008-04-12 2009-10-14 Fischbach Kg Kunststoff-Technik Piston à cartouche
EP2143662A1 (fr) * 2008-07-02 2010-01-13 Nordson Corporation Pistons avec un joint à lèvre et système de cartouche utilisant ces pistons
EP2399846A2 (fr) * 2010-06-22 2011-12-28 Fischbach KG Kunststoff-Technik Piston à cartouche

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CN112752619A (zh) * 2018-10-02 2021-05-04 苏尔寿混合技术有限公司 可重复使用的料筒活塞
CN112752619B (zh) * 2018-10-02 2023-04-18 迈德米斯瑞士股份公司 可重复使用的料筒活塞
IT202200007898A1 (it) * 2022-04-21 2023-10-21 De Longhi Appliances Srl Tramoggia a tenuta ermetica per alimentare chicchi e relativo procedimento di funzionamento
WO2023203587A1 (fr) * 2022-04-21 2023-10-26 De' Longhi Appliances S.R.L. Con Unico Socio Trémie hermétiquement scellée pour l'alimentation en grains et procédé de fonctionnement correspondant
US20250268425A1 (en) * 2022-04-21 2025-08-28 De' Longhi Appliances S.R.L. Con Unico Socio Hermetically sealed hopper for feedings beans, and corresponding method of operation

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DE102017203241A1 (de) 2018-08-30
EP3366612B1 (fr) 2020-08-12
PL3366612T3 (pl) 2021-04-06

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