Exhaust piston, dispensing assembly and method of filling an exhaust piston

Abstract

The invention relates to a venting piston for use with a 2K material comprising a particulate material and a fluid material, the venting piston comprising a piston body having a front end and a rear end, wherein one or more air channels are arranged between the front end and the rear end, and a piston plunger arranged to be movable within the piston body between an open position and a sealing position, wherein when the piston plunger is in the open position, the air channels are open for exchanging air between the front end and the rear end, and when the piston plunger is in the sealing position, the air channels are sealed. The invention further relates to a dispensing assembly comprising such a piston and a method of filling a dispensing assembly.

Description

Technical Field

[0001] This invention relates to an exhaust piston and a method for filling the exhaust piston. Background Technology

[0002] Various methods of distributing mass from a cylinder are known in the prior art. These masses can be so-called single-component masses, which means, for example, single-component materials hardened by a chemical reaction, where the chemical reaction is either brought about by an external energy source (such as UV light or heat) or caused, for example, by moisture present in the surrounding environment at the application site. Typical applications of single-component materials can be found, for example, in the dental field or the construction industry, such as in products for bonding windows and concrete components, or in providing seals between different parts.

[0003] Another known type of mass is the multi-component mass. The materials to be dispensed can be a matrix material and a hardener. The filled cylinder is presented in different ratios, such as 1:1, 2:1, 4:1, and 10:1, which specify the ratio of the amounts of each of the two materials to be dispensed. The reason for these different ratios is to allow for the mixing and dispensing of a wide variety of different components. For example, some components require more hardener, while others require less. Furthermore, some components require more mixing. Mixing tips are known in the prior art, which are adapted to mix the components as they leave the cylinder.

[0004] Other types of 2K materials can be solid granular materials that can be mixed with fluid (e.g., liquid) materials. These types of materials often have a very short shelf life and react once mixed, which is why the materials are stored separately and only brought into contact shortly before use. Such materials are frequently used in the medical and dental fields.

[0005] Two-component materials are commonly used as impression materials, such as in the formation of dental impressions; cement materials for prosthetic restorations and during surgery; and temporary cements for trial cementation restorations or for cementing temporary crowns. Further applications of two-component materials are in the construction industry, where they are used, for example, as replacements for mechanical joints that corrode over time. Adhesive bonding can be used to bond products such as windows and concrete components. The use of multi-component protective coatings (e.g., moisture barriers, corrosion protectants, and anti-slip coatings) is also becoming increasingly common.

[0006] Specifically, when preparing a mixture from a 2K material formed of particulate material and fluid, it is desirable to remove air from the cylinder once the fluid is added to the particulate material in order to avoid defective mixing of the two-component material and thereby improve the quality of the mixing result.

[0007] When filling a cylinder with fluid, the cylinder is typically filled via its outlet using a piston already positioned within the cylinder. Air that was previously present between the particles of the particulate material becomes trapped between the piston and the material to be stored therein, and it is this trapped air that should be removed from the cylinder before the dispensing process. Summary of the Invention

[0008] Therefore, an object of the present invention is to provide a cylinder that promotes improved mixing with reduced air once a fluid material is added to a particulate material. Another object of the present invention is to provide a piston that promotes the expulsion of air present in the cylinder. Yet another object is to provide a piston that is simple to manufacture and cost-effective.

[0009] This objective is achieved by the piston according to claim 1, the dispensing assembly according to claim 17, and the method according to claim 21.

[0010] This piston can be an exhaust piston for use with 2K materials, including particulate and fluid materials. The exhaust piston includes a piston body and a piston plunger. The piston body has a front end and a rear end, wherein one or more air passages are disposed between the front end and the rear end. The piston plunger is arranged to move within the piston body between an open position and a sealed position, wherein when the piston plunger is in the open position, the air passages are open to exchange air between the front end and the rear end, and when the piston plunger is in the sealed position, the air passages are sealed.

[0011] Thus, a piston becomes available, through which air present in the cylinder can be removed, which promotes improved mixing with the reduced air once the fluid material is added to the particulate material.

[0012] This piston consists of only two parts, and is therefore simple and cost-effective to manufacture.

[0013] In this regard, it should be noted that the piston body is considered the main part of the piston, serving as the frame and / or support of the piston.

[0014] It should be further noted that the piston plunger is the movable part of the piston relative to the piston body.

[0015] It should be further noted that the air passage is a channel-like structure used to guide air from one end of the piston to the other.

[0016] One or more air passages can be opened at the front end via vents or vent slots. In this way, the air passages have a direct connection to the cylinder chamber and can draw as much air as possible from the cylinder. Such air passages are simple and cost-effective to manufacture, for example, in injection molding processes.

[0017] The one or more air passages may open at the front end in the outer region of the piston body. In this way, air can be reliably collected at the outer side of the piston body. The outer region may be an annular outer region arranged radially outward of the central region of the piston body.

[0018] The one or more air passages can be opened at the front end between the central region and the outer region of the piston body. In this way, air can be reliably collected in the middle region of the front side of the piston body.

[0019] In this regard, it should be noted that the central region is arranged around the longitudinal axis of the piston.

[0020] The one or more air passages can be opened at the front end, in the central region of the piston body. In this way, air can be reliably collected centrally on the front side of the piston body.

[0021] The one or more air passages may have an opening size of less than 1 mm at the front end. In this regard, it should be noted that the one or more air passages and their corresponding openings (i.e., orifices or slots) at the front end can have one or more sizes selected in the range of 0.2 to 1 mm, preferably in the range of 0.25 to 0.9 mm. In this way, particulate material with a diameter of approximately 1 mm will not fall into and thereby block one of the corresponding air passages and air orifices or slots.

[0022] The piston may further include one or more seals disposed on the peripheral sidewalls of the piston body. Such seals ensure that the material stored in the cylinder has minimal contact with the environment via the piston and cylinder.

[0023] At least one of the one or more seals may be provided in the form of an O-ring. Once the piston is inserted into the cylinder, the O-ring provides a reliable seal between the piston and the cylinder.

[0024] The one or more air passages may open upstream of the peripheral sidewall of the piston body at the front end. In this way, the seal is not affected by the air passages.

[0025] The one or more air passages may open upstream of at least one of the seals on the peripheral sidewall of the piston body. This ensures improved venting from the cylinder chamber once the piston is installed in the cylinder.

[0026] In this regard, it should be noted that between three and twelve exhaust channels can be provided, and more specifically, between three and eight exhaust channels can be provided. The exhaust channels may extend radially around the piston crown, and / or may extend radially outward from the piston crown. In this way, sufficient venting can be ensured.

[0027] The one or more air passages may open upstream of the first of at least one of the O-rings disposed on the peripheral sidewall of the piston body at the front end, wherein the first O-ring is disposed closer to the front end than any other O-rings that can be provided. This ensures improved venting from the cylinder chamber once the piston is installed in the cylinder, while simultaneously ensuring a reliable seal between the piston and the cylinder.

[0028] The piston may further include a filter material disposed on the piston body. This filter material prevents material stored in the cylinder from seeping through the piston and thus reduces potential sources of contamination.

[0029] The filter material can be disposed at the front end of the piston body. In this way, the filter acts as a barrier at the front end of the piston to ensure that the material does not impede the piston's movement through the cylinder.

[0030] The filter material can be disposed within the piston body between the front end and the piston plunger. This filter material prevents material stored in the cylinder from seeping through the piston and thus reduces potential sources of contamination.

[0031] The filter material can be air-permeable and liquid-impermeable. In this way, air can escape from the cartridge while the filter material prevents fluid and particulate materials from entering the piston. This filter material provides both surface and depth filtration capabilities and can include a porous structure containing an omnidirectional interconnected matrix, which can be optimized for filtration efficiency to match application requirements. Additionally, this filter material can be surface-modified or include additives to enhance functionality, resulting in improved performance, durability, and design flexibility.

[0032] The filter material can be a filter made of porous plastic, such as porous PTFE (polytetrafluoroethylene). The trade name for this filter material is POREX, as defined in Porex datasheet MD-003-081418-003 published in 2018.

[0033] The piston plunger can be locked to the piston body when in the sealed position. By locking the piston plunger to the piston body, the piston is locked in the sealed position, thus preventing air from entering the cylinder chamber once air has been expelled by the piston.

[0034] The piston plunger can be locked to the piston body via at least one of a tongue and groove connection and a snap-fit ​​connection. For example, one of the piston plunger and piston body includes snap hooks that can engage with cutouts in the other of the piston body and piston plunger. This snap-fit ​​connection is simple and cost-effective to manufacture.

[0035] The piston plunger may include a front end having a peripheral seal arranged around the front end, wherein the piston body has a sealing surface arranged on its inner surface, wherein the peripheral seal seals against the sealing surface in a sealed position.

[0036] The dispensing assembly may include an exhaust piston as described herein and a cylinder including a chamber having a front end and a rear end, the rear end optionally including a flared end, and the front end including an outlet, wherein the piston is disposed in the chamber, and wherein the dispensing system is filled with 2K material.

[0037] This dispensing component has the same advantages as the piston associated with it and according to the invention.

[0038] In this regard, it should be noted that the flared end is provided as an insertion aid to allow the piston to enter the cylinder, thereby ensuring simple and cost-effective manufacturing of the dispensing assembly.

[0039] The cylinder may have a transparent wall.

[0040] The outlet may include external threads for connection to various fittings, which are selected from a group including a cap and components for dispensing the outlet. Such fittings enable reliable use of the dispensing assembly.

[0041] The rear end may include a handle located on the outer surface of the cylinder. This handle ensures improved manipulation of the dispensing assembly.

[0042] The rear end may include a handle, which is formed by two wings. These wings ensure simple and cost-effective manufacturing of the handle at the dispensing assembly.

[0043] For example, a method for populating an allocation component as described herein may include the following steps: A cylinder filled with granular material is provided, and a piston is arranged in the cylinder chamber, wherein the piston plunger is in the open position; The cylindrical cavity is filled with a fluid material; and Subsequently, when the fluid material has a predefined fill level, the piston is sealed by moving the piston plunger from the open position to the sealed position and locking the piston plunger to the piston body.

[0044] In this regard, it should be noted that the predefined fill level can be considered to correspond to the state when the fluid material reaches the front end of the piston.

[0045] This method allows one to take advantage of the benefits discussed above.

[0046] The method may further include the following steps: monitoring the filling level of the fluid material; and sealing the piston once a predetermined threshold is reached.

[0047] This monitoring ensures reliable and repeated filling of the cylinder with fluid to the desired quality standards.

[0048] The process of monitoring the fill level may include the following steps: optically measuring the fill level through the transparent cylinder wall. This optical measurement ensures that the cylinder is reliably and repeatedly filled to the predetermined level with fluid. Attached Figure Description

[0049] Exemplary embodiments of this disclosure are described herein with reference to the following accompanying drawings, which schematically illustrate: Figure 1A To E are various views of a first-type distribution assembly having a first-type piston; Figure 2A To C are various views of a second-type distribution assembly with a second-type piston; Figure 3A To C are various views of a third-type distribution assembly with a third-type piston; Figure 4A To C are various views of a fourth-type distribution assembly with a fourth-type piston; Figure 5 This is a schematic diagram of the fifth type of piston; Figure 6 This is a schematic diagram of a sixth type of piston; Figure 7 This is a schematic diagram of a type 7 piston; and Figure 8 This is a schematic diagram of the eighth type of piston. Detailed Implementation

[0050] Figure 1A and Figure 1B A corresponding schematic partial cross-sectional view of the dispensing assembly 10 is shown, which includes a cylinder 12 and a piston 14. The piston includes a piston body 16 and a piston plunger 18 (see...). Figure 1B ).

[0051] The cylinder 12 further has a cylindrical chamber 20 having a front end portion 22 and a rear end portion 24, wherein a longitudinal axis A extends between the front end portion 22 and the rear end portion 24. Figure 1 and Figure 1BThe piston body 16 shown is located at the rear end 24 of the cylindrical chamber 16.

[0052] The front end portion 22 includes an external thread 26 on the outer wall 28 of the cylinder 12. The external thread 26 is configured to allow different fittings to be connected to the cylinder 12.

[0053] For example, the cap (not shown) can be connected to the cylinder 12 as a fitting 30 via external thread 26. Additionally, as... Figure 1B The dispensing outlet 30' shown can be connected to the cylinder 12 via the external thread 26.

[0054] In this regard, it should be noted that fitting 30 has an internal thread 32 on its inner surface 34, wherein the internal thread 32 is shaped to complement the external thread 26 of the cylinder 12.

[0055] The tube further includes two wings 36 located at the rear end 24, which act as handles 38 of the tube 12. The wings extend radially away from the tube 12.

[0056] In this regard, it should be noted that the handle 38 can also have different shapes and serve as a grip for the user of the dispensing component 10 to dispense the two-component materials M, M' from the dispensing component via the outlet 30'.

[0057] In this regard, it should be noted that the piston 14 is arranged to move from the rear end 24 to the front end 22 along the longitudinal axis A within the cylinder 20 when dispensing materials M, M' from the cylinder chamber 20 via the outlet 30'.

[0058] Figure 1C A perspective view of piston 14 is shown. The piston is an exhaust piston 14 having a front end 40 and a rear end 42. The front end includes a sealing lip 44 that surrounds a piston cap 46 disposed at the front end 40.

[0059] The front end portion 40 further includes an annular groove 48 surrounding the piston cap 46, wherein the annular groove 48 is recessed from the piston cap 46 and the sealing lip 44.

[0060] exist Figure 1C In the example, multiple venting grooves 50 are arranged at the base 52 of the annular groove 48. The venting grooves 50 extend radially around the annular groove 48. The venting grooves 50 have an elongated extension.

[0061] In this regard, it should be noted that each venting slot 50 can have a width selectable in the range of 0.05 to 0.3 mm and a length selectable in the range of 0.1 to 2 mm. In the specific example shown, eight venting slots are provided, and each venting slot has a width of 0.1 mm and a length of 0.4 mm.

[0062] The piston cap 46 has a crown portion 54 forming the central region 56 of the piston 14 and an annular groove 48 forming the annular outer region 58 of the piston 14.

[0063] In this regard, it should be noted that the crown portion 54 can extend beyond 10% to 30% of the diameter of the front end portion 40 of the piston, that is, beyond 10% to 30% of the diameter of the piston 14, wherein the diameter is as defined by the outermost diameter of the sealing lip 44. In this example, the crown portion 54 extends beyond 22% of the diameter of the front end portion 40.

[0064] In this regard, it should be noted that the outer region 58 can extend beyond 5% to 20% of the diameter of the front end 40 of the piston, that is, beyond 5% to 20% of the diameter of the piston 14, the diameter being defined by the outermost diameter of the sealing lip 44.

[0065] In this example, the outer region 58 extends beyond 12% of the diameter of the piston 14.

[0066] The area between the outer region 58 and the central region 54 is referred to as the intermediate region 76. The front end 40 of the piston 14 has a proximal portion formed by the crown portion 54, which then tapers distally toward the outer region 58 via the intermediate region 76, and then includes the outer region 58 formed by the annular groove 48 and the sealing lip 44.

[0067] In this regard, it should be noted that the intermediate region 76 can extend beyond 50% to 85% of the diameter of the front end 40 of the piston, that is, beyond 50% to 85% of the diameter of the piston 14, as defined by the outermost diameter of the sealing lip 44. In this example, the intermediate region 76 extends beyond 66% of the diameter of the piston 14.

[0068] The outer peripheral surface 64 of the piston 14 further includes an O-ring 60 disposed in a peripheral groove 62.

[0069] like Figure 1D and Figure 1E As indicated, the peripheral wall 78 of the piston body 16 includes an additional seal 66 disposed directly at the rear end 42 of the piston 14, wherein the peripheral wall 78 has a peripheral surface 64 extending from the rear end 42 to the front end 40 of the piston 14. The additional seal 66 is directly adjacent to an annular recess 68, which is directly adjacent to a protruding wall 70 defining a peripheral groove 62 that receives an O-ring. The peripheral groove 62 extends along the piston 14 to the sealing lip 44.

[0070] The exhaust groove 50 at the base 52 of the annular groove 48 is the opening of the air passage 72, which in this example extends axially through the piston cap 46 and then radially through the piston body 16 into the inner space 74 of the piston body 16.

[0071] Piston 14 includes piston body 16 and piston plunger 18, piston plunger 18 being arranged within piston body 16 movable between an open position and a sealed position, wherein when piston plunger 18 is in such a position as Figure 1B and Figure 1E When in the open position indicated, the air passage 72 opens to exchange air between the front end 40 and the rear end 42, and when the piston plunger 18 is in the position indicated by... Figure 1A and Figure 1D When in the indicated sealed position, the air passage 72 is sealed.

[0072] In the sealed position, the piston plunger 18 is locked to the piston body 16, which can be achieved through several connection modes, such as tongue and groove connection and / or snap-fit ​​connection.

[0073] exist Figure 1A and Figure 1D In the example shown, the piston plunger includes a plurality of snap-fit ​​arms 80. The snap-fit ​​arms 80 project axially from the shoulder 92 of the piston plunger 18 toward the front end 82 of the piston plunger 18, parallel to the longitudinal axis A. The end 94 of each snap-fit ​​arm 80 includes a snap-fit ​​hook 86.

[0074] The snap hook 96 of the snap arm 80 engages with a cutout 98 in the piston body 16 within its internal space 74, thereby locking the piston plunger 18 to the piston body 16 via a snap-fit ​​connection.

[0075] In this regard, the snap-fit ​​connection can also be formed by a collar in the groove or recess of the piston body, or vice versa.

[0076] The cutout 98 is arranged in the inner space 74 of the piston body 16 along the longitudinal axis at the axial height of the piston body 16, which corresponds to the axial height at which the annular recess 68 is arranged.

[0077] The piston plunger 18 further includes a peripheral seal 86 extending around the piston plunger 18 at a front end 82. The piston body 16 has a sealing surface 88 disposed at an inner surface 90 of the inner space 74. The peripheral seal 86 seals against the sealing surface 88 in a sealed position and in this way blocks the air passage 72.

[0078] In this regard, it should be noted that when the peripheral seal 82 is not in the sealed position (i.e., sealing against) the sealing surface 88, but is in the open position, it does not seal relative to the remaining portion of the inner surface 90 excluding the sealing surface 88.

[0079] Air passage 72 leads to the inner space 74 of piston body 16 at sealing surface 88.

[0080] The piston plunger 18 further includes a rear end 84 through which force can be applied to the piston 14 to move the piston within the cylinder 12. This force can be applied, for example, manually or by using a distributor (not shown).

[0081] If able to Figure 1D and Figure 1E As seen further, the rear end portion 24 of the cylinder 12 includes a flared end, such that the opening at the rear end portion 24 has a larger diameter than the remaining cylinder chamber 20. The flared end has a truncated cone shape.

[0082] Figure 2A Views of the second type of piston 14 are shown in section C. Figure 2A The piston 14 shown has elongated exhaust grooves 50 that extend radially outward from the central region 76 into the annular groove 48. The exhaust grooves 50 are arranged in a cross shape at the piston cap 46. Apart from the specific features associated with the exhaust grooves 50, the piston 14 is generally shaped in the same manner as the piston described above in conjunction with Figure 1.

[0083] In this regard, it should be noted that each venting slot 50 can have a width selectable in the range of 0.05 to 0.3 mm and a length selectable in the range of 0.1 to 2 mm. In the specific example shown, four venting slots are provided, and each venting slot 5 has a width of 0.2 mm and a length of 1 mm.

[0084] Figure 2A A perspective view of piston 14 is shown. The piston is also an exhaust piston 14 having a front end 40 and a rear end 42. The front end 40 includes a sealing lip 44 that surrounds a piston cap 46 disposed at the front end 40.

[0085] The front end portion 40 further includes an annular groove 48 surrounding the piston cap 46, wherein the annular groove 48 is recessed from the piston cap 46 and the sealing lip 44.

[0086] exist Figure 2A In the example, the plurality of exhaust grooves 50 are arranged at the piston cap 46 and extend to the base 52 of the annular groove 48.

[0087] The exhaust groove 50 begins in the middle of the middle region 74 of the piston 14 and extends to the middle of the outer region 58 of the piston 14.

[0088] The piston cap 46 has a crown portion 54 forming the central region 56 of the piston 14 and an annular groove 48 forming the outer region 58 of the piston 14.

[0089] In this regard, it should be noted that the crown portion 54 can extend beyond 10% to 30% of the diameter of the front end portion 40 of the piston, that is, beyond 10% to 30% of the diameter of the piston 14, as defined by the outermost diameter of the sealing lip 44. In this example, the crown portion 54 extends beyond 22% of the diameter of the front end portion 40.

[0090] In this regard, it should be noted that the outer region 58 can extend beyond 5% to 20% of the diameter of the front end 40 of the piston, that is, beyond 5% to 20% of the diameter of the piston 14, as defined by the outermost diameter of the sealing lip 44. In this example, the outer region 58 extends beyond 12% of the diameter of the piston 14.

[0091] The area between the outer region 58 and the central region 54 is referred to as the intermediate region 76. The front end 40 of the piston 14 has a proximal portion formed by the crown portion 54, which then tapers distally toward the outer region 58 via the intermediate region 76, and then includes the outer region 58 formed by the annular groove 48 and the sealing lip 44.

[0092] In this regard, it should be noted that the intermediate region 76 can extend beyond 50% to 85% of the diameter of the front end 40 of the piston, that is, beyond 50% to 85% of the diameter of the piston 14, as defined by the outermost diameter of the sealing lip 44. In this example, the intermediate region 76 extends beyond 66% of the diameter of the piston 14.

[0093] The outer peripheral surface 64 of the piston 14 further includes an O-ring 60 disposed in a peripheral groove 62.

[0094] like Figure 2B and Figure 2C As indicated, the peripheral wall 78 of the piston body 16 includes an additional seal 66 disposed directly at the rear end 42 of the piston 14, wherein the peripheral wall 78 has a peripheral surface 64 extending from the rear end 42 to the front end 40 of the piston 14. The additional seal 66 is directly adjacent to an annular recess 68, which is directly adjacent to a protruding wall 70 defining a peripheral groove 62 that receives an O-ring. The peripheral groove 62 extends along the piston 14 to the sealing lip 44.

[0095] The exhaust groove 50 at the base 52 of the annular groove 48 is the opening of the air passage 72, which in this example extends axially through the piston cap 46 and then radially through the piston body 16 into the inner space 74 of the piston body 16.

[0096] Piston 14 includes piston body 16 and piston plunger 18, piston plunger 18 being arranged within piston body 16 movable between an open position and a sealed position, wherein when piston plunger 18 is in such a position as Figure 2BWhen in the open position indicated, the air passage 72 opens to exchange air between the front end 40 and the rear end 42, and when the piston plunger 18 is in the position indicated by... Figure 2C When in the indicated sealed position, the air passage 72 is sealed.

[0097] In the sealed position, the piston plunger 18 is locked to the piston body 16, which can be achieved through several connection modes, such as tongue and groove connection and / or snap-fit ​​connection.

[0098] exist Figure 2C In the example shown, the piston plunger includes a plurality of snap-fit ​​arms 80. The snap-fit ​​arms 80 project axially from the shoulder 92 of the piston plunger 18 toward the front end 82 of the piston plunger 18, parallel to the longitudinal axis A. The end 94 of each snap-fit ​​arm 80 includes a snap-fit ​​hook 86.

[0099] The snap hook 96 of the snap arm 80 engages with a cutout 98 in the piston body 16 within its internal space 74, thereby locking the piston plunger 18 to the piston body 16 via a snap-fit ​​connection.

[0100] In this regard, the snap-fit ​​connection can also be formed by a collar in the groove or recess of the piston body, or vice versa.

[0101] The cutout 98 is arranged in the inner space 74 of the piston body 16 along the longitudinal axis at the axial height of the piston body 16, which corresponds to the axial height at which the annular recess 68 is arranged.

[0102] The piston plunger 18 further includes a peripheral seal 86 extending around the piston plunger 18 at a front end 82. The piston body 16 has a sealing surface 88 disposed at an inner surface 90 of the inner space 74. The peripheral seal 86 seals against the sealing surface 88 in a sealed position and in this way blocks the air passage 72.

[0103] In this regard, it should be noted that when the peripheral seal 82 is not in the sealed position (i.e., sealing against) the sealing surface 88, but is in the open position, it does not seal relative to the remaining portion of the inner surface 90 excluding the sealing surface 88.

[0104] Air passage 72 leads to the inner space 74 of piston body 16 at sealing surface 88.

[0105] The piston plunger 18 further includes a rear end 84 through which force can be applied to the piston 14 to move the piston within the cylinder 12. This force can be applied, for example, manually or by using a distributor (not shown).

[0106] Figure 3AFigures C to C show various views of the third type of piston 14. The differences between the pistons 14 shown in Figures 1 and 2 are that the outer seal of the piston 14 exists on the outer surface of the piston plunger 18, the location of the exhaust groove 50, and the shape of the front end 40.

[0107] In this regard, it should be noted that the piston plunger includes a sealing lip located at the front end 40 of the piston 14 and two peripheral seals 66 extending around the front end 40 of the piston 14.

[0108] The venting grooves 50 extend radially around the crown 54 surrounding the central region 56. In this regard, it should be noted that each venting groove 50 can have a width selected in the range of 0.05 to 0.3 mm and a length selected in the range of 0.1 to 2 mm. In the specific example shown, three venting grooves are provided, and each venting groove 50 has a width of 0.2 mm and a length of 1 mm.

[0109] Figure 4A Views 1 to 1 show various views of a fourth type of piston 14. The piston 14 has a centrally located exhaust groove 50 and an air passage 72, which are coaxially arranged with the longitudinal axis A and have a cylindrical shape.

[0110] The front end 40 is formed by a filter 106, which serves as a piston cap 46. The filter 106 is press-fitted into the piston body 16.

[0111] For this purpose, the front end 40 of the piston includes a receiving space 112 formed by an annular wall 108, which forms a collar into which the filter material 106 is pressed. The receiving space 112 further includes three supports 110 for supporting the filter material.

[0112] The filter 106 is placed on the exhaust groove 50 and allows air to flow through the piston body 16, but prevents fluid from flowing through the piston body 16, because the filter 106 is selected to be gas-permeable but liquid-impermeable. The filter 106 is axially retracted from the sealing lip 44.

[0113] Figure 5 A schematic diagram of a fifth type of piston 14 is shown. The piston body 16 and piston plunger 18 are the same as those shown in Figure 2.

[0114] The filter material 106 is press-fitted into the inner space 74 located in the space between the piston body 16 and the piston plunger.

[0115] In this regard, it should be noted that the filter material can have a thickness selectable in the range of 1 to 5 mm, and in the example of Figure 4, it has a thickness of 1.5 mm. Figure 5 The example has a thickness of 2.5 mm.

[0116] Figure 6 A schematic diagram of the sixth type piston 14 is shown. (Compared with Figures 1 and 2) Figure 5 The difference in the example shown is that only one exhaust slot 50 is provided, arranged coaxially with the longitudinal axis A. The exhaust slot 50 has a cylindrical shape and may have a diameter selected in the range of 0.2 to 1 mm. In the specific example, the air passage 72 and the exhaust slot 50 have a diameter of 0.3 mm.

[0117] Like Figure 5 As shown, a filter 106 (not shown) may also be present in the inner space 74 of the piston body 16. This filter may also be press-fitted into the inner space 74.

[0118] Apart from the location of the exhaust groove 50, the remaining features of the piston body 16 and piston plunger are the same as those discussed in conjunction with Figures 1 and 2.

[0119] Figure 7 A schematic diagram of a piston 14 of the seventh type is shown. This example includes some features of the previously described examples, particularly the front end 40, such as... Figure 4A It is shaped as shown in example C, but filter 106 is as Figure 5 As shown in the example, it is press-fitted into the inner space 74 located in the space between the piston body 16 and the piston plunger. Figure 2C , Figure 4A To C and Figure 5 The difference in the example shown is that radial protrusions 87 are provided, which protrude from the piston plunger 18 orthogonally to the longitudinal axis A. The radial protrusions 87 engage with recesses 99 provided in the piston body 16 to lock the piston plunger 18 to the piston body 16.

[0120] Figure 8 A schematic diagram of piston 14 of type 8 is shown. (Compared to...) Figure 7 The difference in the example shown is that the front end 82 of the piston plunger 18 includes a peripheral groove 114, and the peripheral seal 86 includes an O-ring 118 disposed in the peripheral groove 114. The O-ring 118 seals against the sealing surface 88 of the piston body 16 in the sealed position.

[0121] It should be noted that the cylinder 12 described above may have an optically transparent cylinder wall 28. In this way, the filling level of the fluid filled into the cylinder can be monitored.

[0122] The cylinder is suitable for use with 2K material and stores granular material in a storage state. When using the material stored in the cylinder, the material is mixed with a fluid. Therefore, the method of filling the dispensing component 10 includes the following steps: When the piston 14 is arranged in the cylindrical chamber 20, a cylinder 12 filled with granular material is provided, wherein the piston plunger 18 is in the open position; The cylindrical cavity is filled with a fluid material; and Subsequently, when the fluid material has reached a predefined fill level, for example when the fluid reaches the front end 40 of the piston 14, the piston 14 is sealed by moving the piston plunger 18 relative to the piston body 16 from the open position to the sealed position.

[0123] When fluid is filled into cylinder 12, this can be detected optically, for example, through an optically transparent wall.

[0124] Other detection methods can also be used, for example, a predefined amount of fluid can be output to the cylinder via a valve system, and once the fluid is distributed, the movement of the piston plunger 18 relative to the piston body 16 is affected to seal the piston 14.

[0125] Furthermore, a pressure sensor (not shown) can be arranged at the piston plunger 18, which detects the pressure on the piston body 16, and once a threshold is exceeded, the control and evaluation unit recognizes the pressure increase detected by the pressure sensor and sends a signal to the filling station to initiate relative movement between the piston body 16 and the piston plunger 18.

[0126] List of reference numerals 10 allocation components 12 tubes 14 Pistons 16 Piston Body 18 Piston plungers 20 Cylindrical chambers 22 12 front end The rear end of 24 12 26 External thread 28 12 outer wall 30, 30' accessories, distribution export 32 Internal Thread 34 30, 30' inner surface 36 Wings 38 handles 40 14 front end The rear end of 42 14 44 Sealing Lip 46 Piston Cap 48 Annular groove 50 Exhaust Channel 52 Base 54 Crown 56 Central Area 58. Outer Area 60 O-ring 62 Peripheral groove 64 14 peripheral surface 66 Seals 68. Annular recess 70 Protrusion 72 Air passages 74 16 interior space 76. Middle Area 78 Surrounding walls 80 buckle arm 82 18 front end The rear end of 84 18 86 Peripheral seals 87 Radial protrusions 88 74 sealing surface 90 16 inner surface 92 Shoulders 94 80 end 96 Clip Hook 98 incisions 99 recess 100 snap-fit ​​connection 102 Flared end 104 12 opening 106 Filter Material 108 Annular Wall 110 pillars 112 Receiving Space 114 Peripheral Groove 118 O-ring A. Longitudinal axis M, M' Material, Material.

Claims

1. An exhaust piston (14) for use with 2K materials (M, M') comprising particulate and fluid materials, the exhaust piston (14) comprising a piston body (16) and a piston plunger (18), the piston body (16) having a front end (40) and a rear end (42), wherein one or more air passages (72) are disposed between the front end (40) and the rear end (42), the piston plunger (18) being arranged within the piston body (16) to be movable between an open position and a sealed position, wherein when the piston plunger (18) is in the open position, the air passages (72) are open to exchange air between the front end (40) and the rear end (42), and when the piston plunger (18) is in the sealed position, the air passages (72) are sealed.

2. The exhaust piston (14) according to claim 1, wherein, The one or more air passages (72) are opened at the front end (40) via an exhaust port or exhaust channel (50).

3. The exhaust piston (14) according to claim 1 or claim 2, wherein, The one or more air passages (72) open at the front end (40) at the annular outer region (58) of the piston body (16).

4. The exhaust piston (14) according to claim 1 or claim 2, wherein, The one or more air passages (72) open at the front end (40) in the middle region (76) between the central region (56) of the piston body (16) and the outer region (58) of the piston body (16).

5. The exhaust piston (14) according to claim 1 or claim 2, wherein, The one or more air passages (72) open at the front end (40) at the central region (56) of the piston body (16).

6. The exhaust piston (14) according to any one of claims 1 to 4, wherein, The one or more air passages (72) and the corresponding exhaust channels (50) have an opening size of less than 1 mm at the front end (40).

7. The exhaust piston (14) according to any one of claims 1 to 6, further comprising one or more seals (44, 60, 66) disposed on the peripheral wall (78) of the piston body (16).

8. The exhaust piston (14) according to claim 7, wherein, At least one of the one or more seals is provided in the form of an O-ring (60).

9. The exhaust piston (14) according to any one of claims 1 to 8, wherein, The one or more air passages (72) open at the front end (40) upstream of the peripheral wall (78) of the piston body (16); and / or The one or more air passages (72) are opened at the front end (40) upstream of at least one of the seals (44; 60, 66) on the peripheral sidewall of the piston body (16).

10. The exhaust piston (14) according to claim 9, wherein, The one or more air passages (72) open at the front end (40) upstream of the first of at least one of the O-rings (60) arranged on the peripheral wall (78) of the piston body (16), wherein the first O-ring (60) is arranged closer to the front end (40) than any other O-ring that can be provided.

11. The exhaust piston (14) according to any one of claims 1 to 10, further comprising a filter material disposed on the piston body (16).

12. The exhaust piston (14) according to claim 11, wherein, The filter material is arranged at the front end (40) of the piston body (16); or The filter material is arranged in the piston body (16) between the front end (40) and the piston plunger (18).

13. The exhaust piston (14) according to claim 11 or claim 12, wherein, The filter material is air-permeable and liquid-impermeable; and / or The filter material is a porous plastic, such as porous PTFE.

14. The exhaust piston (14) according to any one of claims 1 to 13, wherein, The piston plunger (18) is locked to the piston body (16) when it is in the sealed position.

15. The exhaust piston (14) according to claim 14, wherein, The piston plunger (18) is locked to the piston body (16) by at least one of tongue and groove connection, snap-fit ​​connection, and connection of protrusion (87) and recess (99).

16. The exhaust piston (14) according to any one of claims 1 to 15, wherein, The piston plunger (18) includes a front end (82) having a peripheral seal (86) arranged around the front end (82), wherein the piston body (16) has a sealing surface (88) arranged on its inner surface (90), wherein the peripheral seal (82) seals against the sealing surface (88) in the sealing position.

17. The exhaust piston (14) according to claim 16, wherein, The peripheral seal (86) includes an O-ring (118) arranged in a peripheral groove (114) of the piston plunger (18).

18. A dispensing assembly comprising an exhaust piston (14) and a cylinder (12) according to any one of claims 1 to 17, the cylinder (12) comprising a chamber (20) having a front end (22) and a rear end (24), the rear end optionally including a flared end, and the front end (22) including an outlet, wherein the exhaust piston (14) is disposed in the chamber (20), wherein the dispensing system (10) is filled with 2K material.

19. The distribution component according to claim 18, wherein, The cylinder has a transparent wall.

20. The dispensing component according to claim 18 or claim 19, wherein, The outlet includes an external thread for connection to various fittings, wherein the fittings are selected from a group including a cap and components for distributing the outlet.

21. The dispensing component according to any one of claims 18 to 20, wherein, The rear end includes a handle located on the outer surface of the cylinder; and / or The rear end includes a handle, wherein the handle is formed by two wings.

22. A method of filling a dispensing component according to one or more of claims 18 to 21, the method comprising the steps of: A cylinder filled with granular material is provided, and the piston (14) is arranged in the cylinder chamber, wherein the piston plunger (18) is in the open position; The cylindrical cavity is filled with the fluid material; as well as Subsequently, when the fluid material has reached a predefined filling level, for example when the fluid reaches the front end (40) of the piston (14), the piston (14) is sealed by moving the piston plunger (18) from the open position to the sealed position.

23. The method of claim 22, further comprising the following steps: Monitor the filling level of the fluid material; and seal the piston once a predetermined threshold is reached.

24. The method according to claim 23, wherein, The step of monitoring the fill level includes the following steps: optically measuring the fill level via a transparent cylindrical wall.

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