Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/06—Platens or press rams
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
  • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
  • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
  • B30B11/085—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable for multi-layer articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/06—Platens or press rams
  • B30B15/065—Press rams

Definitions

• the invention relates to a tabletting stamp, the embossing element of which has a pin surrounded by a flat base.
• the invention particularly relates to pressing tools with which tray tablets or tray tabs are produced. In this case, a depression is embossed into the upper side of a large-volume tablet, which can be filled with another material, in particular poured out, in a subsequent assembly step.
• Trough tabs are especially made from substances that work in combination with other substances. It is often the case that the different substances are most advantageous when they go into solution in a precisely defined sequence during use so that they can work together in a dissolved form.
• a common area of application for this type of agent addition is machine dishwashing. In order to make it easier for the user to portion the rinsing aids or more generally the washing, rinsing, cleaning and washing aids, the added amounts which are matched to the machine capacity are pressed into tablets.
• Powdery or granular active ingredients which are to be added separately because of the above-described more effective action, are pressed in discrete layers one above the other. If one or more of the combination active ingredients is originally in pasty or liquid, for example molten form, which is unsuitable for compression, the indentation of a depression in the tablet surface is a proven form for the design of all desired substances of an active ingredient combination absorbing tablet. The liquid, melted and / or pasty active ingredients can be introduced into this trough and solidify in them after filling.
• the technical problem on which the invention is based is to design profiled embossing elements of tabletting punches in such a way that their surfaces have adhesion-reducing or at least adhesion-reducing properties and their surface is designed in such a way that the tablet produced thereby has sufficient mechanical stability.
• This problem is solved according to the invention in that a tabletting punch described at the outset is designed so that its flat base surfaces can be walked in the pressing operation and the pin is incompressible and at least coated to reduce adhesion.
• the mostly powdery or fine-grained material to be compressed into tablets is, if not particularly complex and production-preventing arrangements for a special distribution are taken, approximately evenly distributed when filled in the press die. This has the consequence that the material must be compressed the most at the points where the profile of the embossing element has the highest elevations. Although the material to be pressed tries to evade the highest pressure peaks by moving in the direction of the less stressed areas, the highest specific surface pressures also occur in the areas of the highest profile elevations.
• the profile of the embossing element consists of a flat surface, for example the base surface, which surrounds, for example, an ellipsoidal spigot, the highest surface loads are to be expected on the spigot and on it in the ellipsoid dome.
• the base surface which surrounds, for example, an ellipsoidal spigot
• the highest surface loads are to be expected on the spigot and on it in the ellipsoid dome.
• Kuppe has only a very small angle of inclination with respect to the base plane. By definition, these angles of inclination increase in the direction of the ellipsoid base and are greatest at the transition to the surrounding base area.
• the pressing force acts perpendicular to the base plane and to the surface element in the center of the ellipsoid dome.
• the pressing force is directed onto an increasingly inclined surface, so that the pressing force is divided into a correspondingly smaller force component that is perpendicular to the respective surface element and a force component that is directed vertically thereon.
• These shear forces act quasi tangentially.
• the force components perpendicular to the normal force are a measure of the shear and abrasion forces that act on the interface between the pin and the material to be pressed.
• the ellipsoidal pin must be made of a very hard, incompressible material.
• press punches are preferred in which the pin has the shape of a semi-ellipsoid, a spherical section or a geometrically similar shape.
• the tendency of the material to be pressed to adhere to the surface of the press die is determined, inter alia, by the specific surface pressures between the material to be pressed and the die surface and by the surface structure. If, for example, the surface of the pressing or tabletting die has friction-reducing or lubricating or sliding properties, the tendency to stick is prevented or at least reduced.
• the pressing forces are directed perpendicular to the flat base. Since the flat base surface represents the lowest height in the profile of the embossing element, the lowest compression of the material to be pressed is given in this area. This means that lower surface pressures are to be expected in the area of the base area than in the area of the upwardly curved pin. For these reasons, the material of the base area does not have to be incompressible, especially since only normal forces can be expected from the pressure geometry. In order to improve the adhesion of a tray filling used later, the tabletting punches according to the invention can be provided with further elements.
• Preferred tabletting punches are therefore characterized in that the pin has a depression which is filled with a disk protruding from the depression
• the depression in the pin and thus also the disk inserted into the depression can have different base areas. So it is possible to introduce rectangular or square recesses and filling disks in the pin. In the context of the present invention, however, it is preferred if the depression has the shape of a circle, an ellipse or a geometrically similar shape.
• the dimension of the depression in the pin and the dimension of the disk which is fitted into the depression can also vary.
• Preferred tabletting punches have depressions with a depth of 0.1 to 5 mm, preferably 0.2 to 3 mm and in particular 0.3 to 1.5 mm, it being particularly preferred that the disk be at least 0.1 mm , preferably at least 0.3 mm, protrudes from the recess.
• the disk fitted into the depression consists of a reversibly deformable material with a hardness of 40 to 99 Shore A according to DIN 53505, preferably of polyurethane, for example in particular Vulkollan, or PVC, for example in particular Mipolam.
• polyurethane for example in particular Vulkollan, or PVC, for example in particular Mipolam.
• the above-described shape of a pin with elevation can also be made from one material, ie the drilling of a hole and the subsequent filling with a disk can also be replaced by appropriate shaping from one material.
• the latter procedure naturally does not allow material differences between the peg and the disk protruding from the peg. Where this is not necessary or desired, it can be produced more cost-effectively from one material without drilling and inserting.
• the structure of fillings made of powdery or fine crystalline substances can be regarded as uniform in relation to larger areas or volumes, but is quite different in the micro range. These different density ratios in the micro range counteract the uniform pressing forces on the surface of the base material with different resistances of the material to be pressed. This leads to the fact that at specific points on the surface which are spaced apart in the micro-range, different specific pressures and consequently, with compressible material of the base surface element, slightly different deformations of the material occur. This phenomenon, referred to here as flexing, results in the formation of different normal and transverse forces on the material surface, as a result of which the tendency for material to adhere to the surface of the embossing element in the region of the base area is prevented or at least largely reduced.
• a tabletting stamp the embossing element of which is embodied in the form described, advantageously prevents adhesion or at least reduces adhesion. With such a pressing tool, long tool life and flawless tablet surfaces can be achieved.
• the embossing element of the tabletting punch is not to be limited laterally by the base area and this is surrounded by an essentially uniform, incompressible edge strip, reactions of the compression and deformation process on the inner wall of the die to the compressible base area are excluded.
• An outward slope of the edge strip a clean material distribution in the die and a stabilization of the tablet structure have an advantageous effect.
• the embossing element consists of several individual parts.
• the scope and cut of the individual parts are expediently oriented to the different materials or material requirements.
• the individual production of the elipsoid-shaped peg made of incompressible material coated on the outer surface with at least an adhesion-reducing coating, a plate-shaped element made of walkable material for the base area and a ring-shaped element made of incompressible material for the edge strip is an advantageous delimitation for the design of the individual parts, which are due to offers their different materials.
• the coating of the journal must at the same time be hard and resistant to high surface loads, but must also have a friction-reducing or lubricating property.
• surface coatings containing nickel have proven to be very suitable, in which the finest PTFE particles (Teflon) are enclosed. These give the coating anti-sticking and material guzzling properties.
• an embodiment for the adhesion-reducing coating has also proven itself, in which the base coating material consists of a nickel-phosphorus alloy instead of nickel.
• a coating made of graphite containing diamond particles has proven itself as a further alternative for surface coating with at least an adhesion-reducing effect, but which also otherwise meets the requirements for hardness and durability.
• the surface of the pin is coated with a graphite layer, which is known as lubricating or lubricating, and at the same time serves as a binder for fixing diamond particles, which in turn impart the required hardness to the surface.
• an at least adhesion-reducing coating of the pin can also be made entirely from materials with reduced adhesion.
• Plastics in particular have proven themselves for this purpose.
• a further preferred embodiment of the present invention therefore provides that the pin is not only coated to reduce adhesion, but is also made entirely from adhesion-reducing material. Tabletting punches, the pins of which are made of plastic, are particularly preferred.
• plastics characterizes materials whose essential constituents consist of such macromolecular organic compounds that are produced synthetically or by modifying natural products. In many cases, they are meltable and moldable under certain conditions (heat and pressure)
• plastics are organic polymers and can either be based on their physical properties (thermoplastics, thermosets and elastomers), on the type of reaction in their manufacture (polymers, polycondensates and polyadducts) or on their chemical nature (polyolefins, polyesters, polyamides, polyurethanes, etc .) are classified.
• the pin which is made of plastic in the above-mentioned preferred embodiments, represents an elevation on the embossing element of the tabletting die within the scope of the present invention.
• the surface on which the pin is applied can also take on different shapes, of which plan, flat surface up to hemispherical configurations a multitude of possibilities is conceivable.
• the base on which the pin sits is made of plastic, so that tabletting punches are preferred in which the pin and the flat base are made of plastic.
• the material of the pin is harder than that of the base.
• the term “hardness” is the designation for the resistance that a solid body opposes to the penetration of another body. While the so-called scratch hardness (Mohs hardness) is measured for minerals, for example, other methods for hardness testing have become established technically Brinell, Rockwell and Vickers methods are used most frequently (especially for steel and other metals).
• HB ball pressure hardness
• Rockwell and Vickers methods are used most frequently (especially for steel and other metals).
• the diameter of a ball impression which was generated by impact with a hand hammer (Poldihammer, scleroscope) or by a tensioned spring, serves as the basis for the calculation.
• Another, also dynamic, method for determining hardness is the spring-back method.
• the Shore hardness determined in this way is determined as the rebound hardness for steel by the ball drop test or measured as resistance to penetration against a truncated cone for rubber and other elastomers.
• the ball indentation is measured as the quotient of the test force and the surface area of the impression of a steel ball (5 mm in diameter) after 10, 30 or 60 seconds under load.
• the embossing element consists of several individual parts.
• the scope and cut of the individual parts are expediently oriented to the different materials or material requirements.
• the individual production of the elipsoid-shaped pin made of the harder plastic, a plate-shaped element made of the softer plastic, preferably a walkable material for the base area and a ring-shaped element made of incompressible material for the edge strips, is an advantageous delimitation for the design of the individual parts offers their different materials.
• the pin is made of a harder plastic than the base.
• Hard plastics in particular meet the requirement profile that the pin must be both hard and resistant to high surface loads, but must also have a friction-reducing or lubricating property.
• polyolefins preferably polyethylene or polypropylene
• polyethylenes are polymers with groupings of the type belonging to the polyolefms
• Polyethylenes are produced by polymerizing ethylene using two fundamentally different methods, the high-pressure and the low-pressure process.
• the resulting products are accordingly often referred to as high-pressure polyethylene or low-pressure polyethylene; they differ mainly in their degree of branching and, related to this, in their degree of crystallinity and density. Both processes can be carried out as solution polymerization, emulsion polymerization or gas phase polymerization.
• HMW-LDPE high molecular weight.
• the pronounced degree of branching of the polyethylenes produced by the high-pressure process can be reduced by copolymerization of the ethylene with longer-chain olefins, in particular with butene and octene; the copolymers have the code LLD-PE (linear low density polyethylene).
• the macromolecules of the polyethylenes from low pressure processes are largely linear and unbranched.
• These polyethylenes (HDPE) have degrees of crystallinity of 60-80% and a density of approx. 0.94-0.965 g / cm 3 . They are particularly suitable as cone materials.
• Polypropylenes are thermoplastic polymers of propylene with basic units of the type
• Polypropylenes can be prepared by stereospecific polymerization of propylene in the gas phase or in suspension to give highly crystalline isotactic or less crystalline syndiotactic or amorphous atactic polypropylenes.
• Polypropylene is characterized by high hardness, resilience, rigidity and heat resistance and is therefore an ideal spigot material in the context of the present invention.
• the mechanical properties of the polypropylenes can be improved by reinforcing with talc, chalk, wood flour or glass fibers, and the application of metallic coatings is also possible.
• polyamides are preferably cone materials which can be used in the context of the present invention.
• Polyamides are high-molecular compounds that consist of building blocks linked by peptide bonds. The synthet.
• PA polyamides
• PA polyamides
• AS aminocarboxylic acid types
• AA-SS diamine dicarboxylic acid types
• A denotes amino groups and S carboxy groups.
• the former are formed from one building block by polycondensation (amino acid) or polymerization ( ⁇ -lactam), the latter from two building blocks by polycondensation (diamine and dicarboxylic acid).
• the polyamides are coded from unbranched aliphatic building blocks according to the number of carbon atoms.
• PA 6 is the polyamide and ⁇ -aminocaproic acid or ⁇ -caprolactam.
• PA 12 is a poly ( ⁇ -laurine lactam) made from ⁇ -laurine lactam.
• PA 66 polyhexamethylene adipamide
• PA 610 polyhexamethylene sebacinamide
• PA 612 polyhexamethylenedodecanamide
• the polyamide types mentioned are preferred materials for the pin in the context of the present invention.
• Polyurethanes are polymers (polyadducts) with groupings of the type that are accessible through polyaddition from dihydric and higher alcohols and isocyanates - [CO-NH-R 2 -NH-CO-O-R'-O] -
• R 1 stands for a low-molecular or polymeric diol radical and R 2 for an aliphatic or aromatic group.
• the plastics mentioned can be used alone as peg materials, but they can also be provided with coatings or laminations made of metals or other substances.
• the use of glass-fiber reinforced plastics as the peg material has proven particularly useful.
• Glass fiber reinforced plastics (GRP) are composite materials made from a combination of a matrix of polymers and glass fibers that act as reinforcements.
• the glass materials used for fiber reinforcement are present in the GRP as fibers, yarns, rovings (fiberglass strands), nonwovens, fabrics or mats.
• Suitable polymer matrix systems for GRP are both thermosets (such as epoxy resins, unsaturated polyester resins, phenol and furan resins) and thermoplastics (such as polyamides, polycarbonates, polyacetals, polyphenylene oxides and sulfides, polypropylenes and styrene copolymers).
• the weight ratio between the reinforcing material and the polymer matrix is usually in the range from 10: 90-65: 35, the strength properties of the GRP generally increasing up to an amplifier content of approximately 40% by weight.
• the GRP is mainly manufactured in pressing processes; other important manufacturing processes are hand lamination, fiber spraying, continuous impregnation, winding and spinning processes.
• prepregs glass fiber materials pre-impregnated with resins, are used, which are heat-cured using pressure.
• the GRP are characterized by increased tensile, bending and compressive strength, impact resistance, dimensional stability and Stability against the influence of heat, acids, salts, gases or solvents.
• glass-fiber-reinforced polyterafluoethylene and glass-fiber-reinforced polyamides have proven particularly useful as peg materials.
• an elevation from the pin surface can be realized not only by inserting a washer, but also by manufacturing a geometrically identical body from one material.
• Plastics are particularly suitable for such geometries, with polyamides having proven particularly useful.
• the dimension of the pin can be adapted to the dimension of the molded body to be produced, so that the trough resulting in the molded body has suitable dimensions in comparison with the volume of the molded body.
• the pin has a volume of 0.5 to 5 ml, preferably 0.6 to 3 ml and in particular 0.8 to 2 ml.
• the volume of the pin is to be understood as the volume that the pin embossed into the molded body as a trough.
• cone volume therefore denotes the volume of the "cone head", the "stem", i.e. the elements that serve to attach the elevation to the tabletting stamp are not included.
• the base surface consists of a reversibly deformable material with a hardness of 40 to 99 Shore A according to DLN 53505.
• very good results were achieved, for example, with the Vulkoll.an polyurethane material or the Mipolam PVC material. No adherence to the base material was found over a period of several thousand pressings.
• the dimension of the base area is also adapted to the dimension of the molded body to be produced, so that the base and top side of the molded body have suitable dimensions compared to the volume of the molded body.
• the base area of the tabletting die is 5 to 30 cm 2 , preferably 5 to 20 cm 2 and in particular 8 to 12 cm 2 .
• the pressing processes can be optimized if the tabletting punch is designed in such a way that the base area (3) is surrounded by an incompressible, essentially uniform edge strip (5).
• this edge strip lies on the inside at the level of the upper surface area and is beveled so as to rise towards the outside.
• base area and peg can be realized in a stamp which is used for the production of detergent tablets.
• round detergent tablets can also be produced with a stamp according to the invention.
• a further important embodiment of the present invention therefore provides that the tabletting stamp is characterized in that the base area is essentially round.
• the individual production of the elipsoid-shaped pin is made of incompressible material that is at least reduced in adhesion on the outer surface or made of completely reduced-plastic material, a plate-shaped element made of walkable material for the base area and a ring-shaped element made of incompressible material for the edge strip an advantageous demarcation for the design of the individual parts, which lends itself because of their different materials.
• FIG. 1 shows the cross section through a tabletting stamp.
• FIG. 2 shows the top view of a tabletting stamp according to FIG. 1;
• Fig. 3 is a schematic exploded view of a tabletting stamp disassembled into individual parts, the contours of which are similar to the stamp according to FIG. 1, and
• Fig. 4 shows schematically the sectional side view of a tray tablet, which was produced with a proposed tabletting stamp.
• the tabletting stamp 1 is shown in a sectional side view.
• the exemplary embodiment shown has a pin 4 in the form of a semi-ellipsoid and an essentially rectangular base area 3. This clearly shows the base area 3, the edge strip 5 arranged around the base area 3 and the pin 4 surrounded by the base area, which here as half Elipsoid is formed.
• a surface coating 12 can be seen on the pin 4.
• the pin 4 can be made of plastic, so that the surface coating 12 can be omitted.
• the tabletting die 1 has adjustment and centering holes 7 in the die body and shaft, which are enable exact alignment in relation to the tablet press and the complementary tablet tools.
• the illustrated embodiment of the tabletting die 1 is an upper die. This corresponds to the preferred embodiment.
• Edge strips 5, base 3 and pin 4, which together form the embossing element 2, are in contact with the material to be pressed during the pressing process.
• the surface of the pin 4 is coated with an anti-adhesive layer 12, which can be omitted if the pin 4 is made entirely of adhesion-reducing material.
• the adhesion of material to be ve ⁇ ressendes is prevented by the fact that the material of the base is made of a very strong and smooth, but walkable material. Suitable materials for this are, for example, polyurethane, preferably Vulkollan, and PVC materials, for example Mipolam.
• the material of the edge strip 5 is incompressible and the beveled surface is very smooth.
• Their anti-adhesive design can be supported, for example, by hard chrome plating or by a surface coating with Ni-PTFE, Ni-P-PTFE or C-diamond.
• the layer 12, with which the surface of the pin 4 and possibly the edge strip 5 is coated for the purpose of preventing or at least reducing the adherence of material to be pressed, must have at least two properties. It must be hard and incompressible, similar to the base material of the pin, and on the other hand support or facilitate the sliding between the pin and the material to be ve ⁇ ress. These sliding properties are particularly important in order to avoid buildup, so that the transverse forces acting virtually tangentially due to the tendency towards the orientation of the pressing force support or at least do not hinder material movement in the micro range directed in the direction of these transverse forces. These relative movements in the micro range counteract the adhesion of the material to be held.
• the alternative coating of the edge strip 5 with the layer 12 is indicated by the broken line.
• FIG. 2 shows the top view of the tabletting die 1 according to FIG. 1.
• the substantially rectangular, but rounded at the corners shape of the embossing element 2 can be clearly seen that it is formed from edge strips 5, base area 3 enclosed therefrom and surrounded by a pin 4.
• the circular outline of the press punch base can be seen.
• FIG. 3 shows in schematic form how a tabletting punch 1, which is similar to the tabletting pen shown in FIGS. 1 and 2, can be divided into individual parts.
• a mushroom-shaped part with a head in the form of the ellipsoidal pin 4 and an annular layer 6, the uncovered outer surface parts of which form the base area 3, and a frame element, the outer boundary of which is formed by a wall, the upper part the edge strip 5 corresponds to the individual parts.
• These individual parts shown here in exploded form, form the tabletting die 1 with the embossing element 2 in an assembled form.
• This embodiment is designed in such a way that the parts to which different surface requirements are made are each designed as a single part with different materials or material processing.
• the different requirement profiles for the different parts of the embossing element 2 can be represented in a simple and technically clearly controllable form.
• the individual parts are locked together in an assembled form, so that the immovability and the stability of the tabletting die 1 is ensured.
• the trough bar 8 shown here is made of two different materials, which were pressed separately from one another and can be clearly distinguished from one another in the two layers, the lower layer 11 and the upper layer 10. Since both layers 10, 11 are produced with the same pressing tool, that is to say in the same die, into which the material of the lower layer 11 and before the second pressing operation have been filled, the material of the upper layer 10, and are produced with the same tabletting die 1, both have Layers 10, 11 identical side and top Border contours.
• the facets 13 formed by the edge strip 5 of the embossing element 2 and a corresponding profiling of the die (not shown) are clearly recognizable.
• the press force is divided into a normal force component perpendicular to the slanted surface and a lateral force component. This is quasi-tangential and causes a certain amount of shear stress on the material to be held.
• the trough bar 8 is assembled, the trough 9 is filled with a third substance after the pressing process, which is filled in either pasty or liquid or molten and solidifies or solidifies in the trough.
• the trough can also be filled with a separately manufactured molded body that is glued or pressed into the trough.
• the adhesion of the trough-filling molded body is achieved by pressure or adhesion promoter or by a combination of both measures.
• a recess can be drilled in the pin, into which a disk is inserted.
• the adhesion of the trough filling can be improved by this further elevation on the journal.
• FIG. 5 shows the cross section through a tabletting stamp with the additional element.
• FIG. 6 shows the top view of a tabletting stamp according to FIG. 5;
• Fig. 7 is a schematic exploded view of a tabletting stamp broken down into individual parts, the contours of which are similar to the stamp according to FIG. 5, and
• Fig. 8 shows schematically the sectional side view of a tray tablet, which was produced with a proposed tabletting stamp.
• the tabletting stamp 1 is shown in a sectional side view.
• the illustrated embodiment has a pin 4 in the form of a semi-ellipsoid and an essentially rectangular base area 3. This clearly shows the base area 3, the edge strip 5 arranged around the base area 3 and the pin 4 surrounded by the base area, which here is half Elipsoid is formed.
• a surface coating 12 can be seen on the pin 4.
• the pin 4 can be made of plastic, so that the surface coating 12 can be omitted.
• the pin 4 also has a recess into which a disk 14 protruding from the recess is fitted.
• the tabletting punch 1 has in the punch body and - create adjustment and centering holes 7, which enable its exact alignment in relation to the tabletting address and the complementary tableting tools.
• the illustrated embodiment of the tabletting stamp 1 is again an upper stamp. Edge strips 5, base area 3, pin 4 and washer 14, which together form the embossing element 2, are in contact with the material to be pressed during the pressing process. In order to avoid or at least to reduce sticking of the material to be ve ⁇ resses, the surface of the pin 4 is coated with an anti-adhesive layer 12, which can be omitted if the pin 4 is made entirely of adhesion-reducing material.
• the adhesion of material to be ve ⁇ ressendes is prevented by the fact that the material of the base is made of a very strong and smooth, but walkable material. Suitable materials for this are, for example, polyurethane, preferably Vulkoll.an, and PVC materials, for example Mipolam.
• the material of the edge strip 5 is incompressible and the beveled surface is very smooth. Your preventative Design can be supported, for example, by hard chrome plating or by a surface coating with Ni-PTFE, Ni-P-PTFE or C-diamond.
• the layer 12, with which the surface of the pin 4 and possibly the edge strip 5 is coated for the purpose of preventing or at least reducing the adherence of material to be pressed, must have at least two properties. It must be hard and incompressible, similar to the base material of the pin, and on the other hand support or facilitate the sliding between the pin and the material to be ve ⁇ ress. These sliding properties are particularly important in order to avoid buildup, so that the transverse forces acting virtually tangentially due to the tendency towards the orientation of the pressing force support or at least do not hinder material movement in the micro range directed in the direction of these transverse forces. These relative movements in the micro range counteract the adhesion of the material to be held.
• the alternative coating of the edge strip 5 with the layer 12 is indicated by the broken line. As already mentioned, the coating 12 can be omitted if the pin 4 and optionally the rim tire 5 are made entirely of adhesion-reducing materials.
• FIG. 6 shows the top view of the tabletting punch 1 according to FIG. 5.
• the substantially rectangular, but rounded at the corners shape of the embossing element 2 can be clearly seen, since it surrounds the edge strip 5, including the base area 3 and surrounding it, a pin 4 with a disk which is seated in a recess in the pin and protrudes from the pin 14 is formed.
• the circular outline of the press punch base can be seen.
• FIG. 7 shows in schematic form how a tabletting punch 1, which is similar to the tabletting pen shown in FIGS. 5 and 6, can be divided into individual parts.
• These individual parts shown here in exploded form, form the tabletting die 1 with the embossing element 2 in an assembled form.
• This embodiment is designed in such a way that the parts to which different surface requirements are placed are each designed as a single part with different materials or material processing.
• the different requirement profiles for the different parts of the embossing element 2 can be represented in a simple and technically clearly controllable form.
• the individual parts are locked together in an assembled form, so that the immovability and the stability of the tabletting die 1 is ensured.
• the trough bar 8 shown here is made of two different materials, which were pressed separately from one another and can be clearly distinguished from one another in the two layers, the lower layer 11 and the upper layer 10. Since both layers 10, 11 are produced with the same pressing tool, that is to say in the same die, into which the material of the lower layer 11 and before the second pressing operation have been filled, the material of the upper layer 10, and are produced with the same tabletting die 1, both have Layers 10, 11 have identical lateral and upper boundary contours.
• the facets 13 formed by the edge strip 5 of the embossing element 2 and a corresponding profiling of the die (not shown) are clearly recognizable.
• the pressing force is only exactly in the center of the disc seated in the pin or in the center of the pin 4 and the disk 14 protruding from it in the trough 9 formed to be ve ⁇ ressenden exactly perpendicular to the material to be ve ⁇ ressenden. In all other areas, the press force is divided into a normal force component perpendicular to the slanted surface and a lateral force component. This is quasi-tangential and causes a certain amount of shear stress on the material to be held.
• the trough bar 8 is assembled, the trough 9 is filled with a third substance after the pressing process, which is filled in either pasty or liquid or molten and solidifies or solidifies in the trough.
• the trough can also be filled with a separately manufactured molded body that is glued or pressed into the trough.
• the adhesion of the trough-filling molded body is achieved by pressure or adhesion promoter or by a combination of both measures.
• trough tabs were furthermore produced which were obtained by pressing with a pressing tool in which a circular, 1 mm deep hole with a diameter of 5 mm was drilled in the pin, which was made with a 2 mm thick disc Mipolan was filled out.
• the tray tabs produced in this way thus contained a further cylindrical depression in the ellipsoidal depression.
• composition of the pre-mixed pre-mixes and the physical parameters during the pressing were identical in both molded body series. Both moldings were filled with 1 ml paraffin (mp. 66-67 ° C) by pouring the melted paraffin at a temperature of 75 ° C into the moldings at room temperature.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Medicinal Preparation (AREA)
• Treatment Of Fiber Materials (AREA)

Priority Applications (1)

Applications Claiming Priority (7)

Publications (1)

Family

ID=27218614

Family Applications (1)

Country Status (9)

Families Citing this family (6)

Family Cites Families (8)

• 1999
  • 1999-08-12 JP JP2000566104A patent/JP2002523241A/ja active Pending
  • 1999-08-12 CN CN99809883A patent/CN1328499A/zh active Pending
  • 1999-08-12 HU HU0103383A patent/HUP0103383A3/hu unknown
  • 1999-08-12 KR KR1020017001989A patent/KR20010053638A/ko not_active Application Discontinuation
  • 1999-08-12 SK SK245-2001A patent/SK2452001A3/sk unknown
  • 1999-08-12 PL PL99346215A patent/PL346215A1/xx unknown
  • 1999-08-12 CZ CZ2001659A patent/CZ2001659A3/cs unknown
  • 1999-08-12 WO PCT/EP1999/005863 patent/WO2000010801A1/de not_active Application Discontinuation
  • 1999-08-12 EP EP99941582A patent/EP1105284A1/de not_active Ceased

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events