DK3092128T3 - STAMP TAPE AND PROCEDURE FOR MANUFACTURING - Google Patents

Description

The invention concerns a stamp band and a method for producing a stamp band, as are described in the generic terms of claims 1 and 11. A band for price labeling devices is known lfom US 4 265 174 A wherein both printing characters as well as readable characters are arranged. In this system, a printing character always alternates with a readable character. In order to prevent the readable characters from being contaminated, the band thickness in the reading area is less than in the printing area, so that when immersed in a pad impregnated with color, the color remains adhering only to the printing characters and an appropriate 1 impression can be produced.

Stamp bands are known also from JP 9300802 A, JP 5187626 A and JP 11235859 A, which also have a printing area with printing characters and a reading area with readable characters arranged in between. These bands are defined for pre-ink stamps wherein the color is incorporated in the base material of the band and is stamped out during a stamping process through the printing characters.

In US 5 983 789 A, a stamp band with a printing area and a reading area is shown wherein the reading area has a coating with color which is different from the color of the band. A second coating of color, the color in turn being different from that of the first coating, is provided over the first coating.

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However, bands are also known, in particular from US 3 796 152 A, wherein, for example, a plurality of printing characters arranged adjacent to one another are formed and, next to them, a plurality of readable characters arranged adjacent to one another, so that the band is constructed of two different regions. US 6 109 179 A discloses a production method for a band, in particular a price labeling band, wherein the band is formed from two areas, that is, a printing area and a reading area. The transition between the areas is unused in this type of production, i.e., such that, in this case, a so-called blank area is present on each side of the band, which has an adverse effect on the length of the band. During production, a sword, or mandrel, is inserted into a mold consisting of two parts for a band block, on which ribs are formed. A longitudinal thread is wound around the mandrel, in particular the ribs on the mandrel, to prevent the band from stretching. The band material is pressed via channels into the cavity of the mold so that the contour of the mold, in particular the printing characters, is imprinted on the formed band block. After cooling, the band block is cut into the individual bands, so that individual thin bands are created.

A similar method for producing an endless band exclusively with printing characters is known from US 3 418 929 A, wherein, again, a band block, consisting of a plurality of bands adjacent to one another, is produced. In this case, an endless weft thread is wound around the sword and then is inserted into the mold. However, in doing so, an impression material, in particular rubber, is now inserted on or, respectively, under the sword, at which point the mold is heated. The impression material is melted as a result and is able to receive the shapes of the mold, in particular the printing characters. Simultaneously, the weft thread is embedded in the impression material. After the production process, the band block is again cut into individual stamp bands.

The disadvantage in the case of all of the bands mentioned above is that, while a thread, in particular a weft thread, is inserted or incorporated to strengthen the band, nevertheless this thread is not embedded optimally in the impression material, or base material, so that after using for a long time, the cord becomes frayed. Due to this type of fraying, additional color is absorbed from the color reservoir, in particular a color pad, and it is released again when contacted. This worsens the quality of the stamped imprint substantially. Also, when this type of fraying occurs, there is a high risk of the user being contaminated when the user is adjusting the desired imprint area.

The task of the invention is to create a stamp band as well as a method of producing a stamp band in which an optimal and above all long-term embedding is achieved in the impression material. A further task is to overcome the disadvantages of the prior art as far as possible.

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The task of the invention is resolved by a stamp band wherein the weft thread is made of polyamide or polyester and the warp threads are made of cotton and having a diameter between 0.03 mm and 0.2 mm or a textile measurement from 100 to 200 dtex, and that the weft thread or the entire fabric is wetted with a bonding agent.

This is advantageous in that this type of construction imbues the stamp band with a very high tear resistance, at the same time substantially improving the bonding with the rubber impression material. The substantial advantage due to this type of combination or construction is that the fabric embedded in the rubber impression material no longer frays significantly on the side flanks of the stamp bands since, 1 due to the bonding agent, good embedding in the rubber material takes place. This type of construction also ensures that, in the case of narrow bands, the embedding of the fabric in the rubber impression material is secure and a high tear resistance is achieved at the same time by using a special weft thread. This is necessary insofar as the bands are normally assembled in a stressed state on so-called MB's (mounted band replacement unit). However, it is also advantageous that, by forming the polymer fiber as orientated fibers, preferably in the extrusion direction, it is possible by fitting the polymer fiber, formed in this manner, as a weft thread on to a heated rod to create any desired controllable contraction effect of the fabric band thus composed, in order to achieve precise dimensioning of the tubular band fabric. A construction is also advantageous wherein the bonding agent is made of RFL, in particular resorcinol formaldehyde latex, since, by conducting targeted research in the area of properties of bonding and adhesion between thermoplastic materials, preferably PET and PA, and different rubbers and, by carrying out innumerable tests with this bonding agent, it was possible to achieve very good bonding properties with the weft thread and rubber impression material.

The formation is advantageous wherein the RFL latex is made of 45 to 60% of water, 0.1 to 0.2% of 1 sodium hydroxide, 2 to 4% of resorcinol formaldehyde resin and 35 to 50% of synthetic latex, in particular SBR latex, since the best results were obtained by doing so. By using the special bonding agent, on the one hand, it remains strongly adhering to the weft thread so that, in so doing, the weft thread is very well embedded, or respectively, bonded with the rubber impression material. Thus, the fraying of the weft thread could be avoided practically completely even with very narrow bands, which was proven in an endurance test to simulate the use of the bands between 10 and 15 years.

In the case of one embodiment wherein the weft thread is made from polyamide or polyester fibers, where this is formed as a monofilament or multifilament, advantageously it is found that, in doing so, the tear resistance of the fabric and, thus, of the stamp band at the same time, is substantially raised. Therefore, when the stamp band is being mounted, a substantially higher tensile force can be used without tearing the stamp band.

However, an embodiment is advantageous in which the printing characters and/or the readable characters are formed by individual blocks or areas on the outer side of the stamp band, since independent areas are created thereby which can be treated independently of each other.

In the embodiment, wherein one block comprising a printing character always alternates with one block showing a reading character, by so doing it is advantageous by enabling a special reading band to be created for stamps. In this case, preferably the readable characters are represented legibly for the user whereas the printing characters are formed as a mirror image, so that, in the case of a stamp impression, these are then represented so that they are readable, i.e., correctly.

An embodiment is advantageous wherein, on the opposite side of the printing characters, i.e., on the inner side, centering and/or cam elements are provided since, by so doing, a so-called tooth system can be produced for the optimal transportation of the band on a component. This prevents slippage of the band during transportation.

In one embodiment it is advantageous if the rubber impression material is formed from dyed rubber since, in this way a better contrast between for the readable characters is produced so that the user can decipher them easily.

However, one embodiment is advantageous wherein the block for the readable character is marked with of a color different from the color of the rubber impression material since, by so doing, the readable characters can be more easily read.

In one embodiment, wherein the block or readable character area for the readable characters is marked 1 with a covering layer preferably glued on, advantageously it is found that, by so doing, it is possible to adapt optimally to the application area of the band, since, by so doing, any form of covering layer can be applied.

The task of the invention is also resolved, however, by a method for producing a stamp band wherein the weft thread is made of polyamide or polyester and has a diameter between 0.03 mm and 0.2 mm or a textile measurement from 100 to 200 dtex, and that the weft thread or the entire woven hose is wetted prior to the vulcanization process.

Here, it is advantageous that the construction of the weft thread results in a very high tear resistance, as a result of which very small, in particular narrow bands can be produced. In doing so, advantageously it has been found that the weft thread can be bonded in the best manner possible to the rubber impression material by means of the bonding agent and is embedded securely in it. This therefore also prevents the fraying of the fabric, in particular of the weft thread, in the case of small band thicknesses and/or narrow bands. This substantially improves the quality of the bands and also of the stamp.

Those measures are also advantageous, however, in which an RFL, in particular from resorcinol formaldehyde latex, is used as the bonding agent, since, by so doing, a very good bond is achieved with the rubber impression material.

In the case of measures wherein the RFL latex is made of 45 to 60% of water, 0.1 to 0.2% of sodium hydroxide, 2 to 4% of resorcinol formaldehyde resin and 35 to 50% of synthetic latex, in particular SBR latex, are combined, this is advantageous since the best results were obtained with this type of composition.

The measure is advantageous wherein the produced stamp band hose or stamp band block is cut into individual stamp bands after the vulcanization process since, by so doing, with one vulcanizing mold, a band block consisting of a plurality of segments can be produced in one operation which, only then, has to be cut into the individual segments or bands. Thus, considerable tooling costs can be saved.

Next, the invention is described in the form of embodiment examples, and it should be pointed out that the invention is not limited to the illustrated and described embodiment examples or solutions.

They show, in:

Fig. 1 a schematic representation of a cut endless stamp band, in a simplified illustration;

Fig. 2 a pictorial representation of a partial section of the stamp band with printing characters and readable characters;

Fig. 3 a schematic, diagrammatic, representation of an MB (mounted band replacement unit) for a date with bands comprising printing characters;

Figs. 4 and 5 a schematic sequence to produce a stamp band in which a weft thread is wetted with a bonding agent;

Fig. 6 a schematic sequence to produce a stamp in which a woven hose is wetted with a bonding agent.

By way of introduction, it should be noted that, in the different types of embodiment, the same parts are provided with the same reference symbols or same component designations wherein the disclosures contained in the entire description may be read across analogously to the same parts with the same reference symbols or same component designations. Also, the positional data selected in the description, such as above, below, to the side, etc., refer to the described figure and, if there is a change in position, are to be read across analogously to the new position. Also, individual features or combinations of features from the illustrated and described embodiment examples may, as such, represent stand-alone inventive solutions. A preferred endless stamp band 1 for an adjustable stamp, in particular for a date stamp, is shown in Figs. 1 to 6.

The stamp band 1 comprises at least one fabric 4 consisting of a weft thread 2 and a plurality of warp threads 3, which is embedded by a vulcanization process in a rubber impression material 5. Furthermore, a plurality of printing characters 6 are formed for a stamp impression (not shown) and/or, possibly, a readable character 7 to read the character in the rubber impression material 5. The printing characters 6 and/or, possibly, the readable characters 7 are formed by individual blocks or areas 8, 9, in particular a printing area 8 and/or, possibly, a reading area 9, on the outer side of the stamp band 1. The individual area may be divided in this case by constrictions or indentations, so that the mobility, in particular the flexibility, of the band is increased substantially. As can be seen in the diagrammatic partial section of the stamp band 1 in Fig. 2, the printing characters 6 are formed as a mirror image whereas the readable characters 7 are formed so that they may be read off. Furthermore, it can be seen that the printing characters 6 extend out of the rubber impression material 5, whereas the readable characters 7 preferably can be made out from the rubber impression material 5. Preferably, the readable characters 7 or reading area 9 are between 1.6 mm to 3 mm, in particular 2.2 mm, in size so that they can be read off very easily but which do not increase the length of the band excessively. The printing characters 6, in contrast, are between 2 mm and 14 mm, in particular 4 mm, in size in order to be able to produce an impression of an appropriate quality.

With so-called readable bands, such as that shown, a block of a printing character 6 always alternates i with a block of a readable character 7. Naturally, a two-part readable band can also be created wherein the printing characters 6 and the readable characters 7 are in line with each other, or a so-called pressure band is used with printing characters 6 only. Furthermore, it can be seen that, on the opposite side of the printing characters 7, centering and/or cam elements 10 are formed, i.e. on the inner side.

Furthermore, it is possible to make the stamp band 1 colored for better legibility. This can be done, for example, by making the rubber impression material 5 with colored rubber, whereas a contrast is created by the deeper formation of the readable character 7. Also it is possible that the block for the readable character 7 is marked with a color different from the color of the rubber impression materials 5 or the block for the readable character 7 is marked with a preferred covering layer that is glued on.

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These types of stamp bands 1 are incorporated preferably in so-called MB's 11 (mounted band replacement units 11) for depicting a date, wherein the MB's 11 are incorporated in the stamp, in particular in an office stamp, as illustrated pictorially in Fig. 3. As an example in this case, four stamp bands 1, separated from each other, are present in an MB 11 wherein the first two stamp bands 1 are used for the day (day bands 12, 13), the third is used for the month (month band 14) and the fourth is used for the year (year band 15). It is also evident from this that different band widths are needed for the different types of band. In this case, the so-called day bands 11, 12 have the narrowest width of the bands, for example about 1.5 mm to 3 mm, as a result of which the manufacturing process is preferably adjusted to this band size since the small size causes considerable problems. Where the bands are i particularly wider, as in the case of a month band 14 or a year band 15 with a width of about 8 mm to 10 mm, there is sufficient room and material to ensure that the manufacturing process is reliable. Of course, it is possible that bands of this type, in particular the stamp band 1, can also be used for other applications in the stamp field or for price labeling devices for which entirely different printing characters 6 or readable characters 7 have to be created in producing the stamp band 1. For example, they can be used in numbering stamps, IB AN stamps or similar, i.e., there are different areas of application for the band by forming the printing characters 6 or printing areas 8 in different ways. Furthermore, it can be seen from Fig. 3 that the stamp bands 1 are mounted tightly on the MB 11, that is, under tension. The stamp bands 1 are adjusted in the illustrated MB 11 by adjustment wheels 16, although it is possible to have other variants involving levers or full automation using drive systems.

The significant problems in the case of the stamp bands 1 known in the prior art are that, after frequent use, in other words after extensive adjustment or setting of the bands, the incorporated fabric 4 becomes loose or frays on the sides and/or the cut edges. This often happens because, in the course of time, the stamp bands 1 abrade against the adjustment or setting wheels 16 or levers, or the fabric 4 or threads of the fabric 4 become detached from the rubber impression material 5 due to the pretensioning and the flexural stress in the incorporated systems. Due to the projecting threads (weft thread 2 and/or warp threads 3), color is now also taken up by these frayed threads in a stamping process from a stamp pad (not shown), so that when imprinting the color is transferred by the threads on to undesired places so that the stamped image or stamp quality is significantly worsened. At the same time, these frayed threads extend mostly into the adjustment area of the stamp so that the user comes into contact with the color taken up by the frayed threads during a setting process using the adjustment wheels 16 and, as a result, the color is transferred so that the user is contaminated correspondingly. Also, the stamping parts, in particular the adjustment wheels 16, coming into contact with the frayed threads, are contaminated with the threads which, in turn, results in unpleasant contamination on the fingers during touching.

The aim is to rectify these types of disadvantage with the new stamp band 1 and to significantly reduce the fraying of the threads 2, 3 or to avoid the fraying for the most part which ensued in a corresponding endurance test in the development phase of the new stamp bands 1.

It is essential in this process that, on the one hand, to achieve an optimal embedding of the fabric 4, in particular of the weft thread 2 and the warp threads 3, in the base material, in particular in the rubber impression material 5, and, on the other hand, to achieve very high tensile- and/or tearing forces. This is achieved insofar as different materials are used for the fabric 4, in particular for the weft thread 2 and the warp threads 3, wherein, for the weft thread 2, a material for high tensile- and/or tearing forces is used and, for the warp threads 4, a material for good bonding with the rubber impression material 5 is 1 used. Preferably, in this case, the weft thread 2 is made from polyamide or polyester, in particular from PA6, PA66, etc., whereas the warp threads 3 consist of cotton. According to the invention, in order to optimize the embedding of the fabric 4 in the rubber impression material 5, provision is made that the produced fabric 4 and/or the weft thread 2 is wetted with a bonding agent 17, i.e., that, based on innumerable trials, it has turned out that, in order to optimize achieving the best embedding properties, it has been shown in turn that it is not possible to use any bonding agent 17 since the threads, in particular the weft thread 2, have to be designed to be very thin or fine for these types of stamp band 1 to be able to maintain the corresponding structural size. In this case, the thermoplastic weft thread 2, preferably PA or PET, is made especially as a multifilament made from oriented, spun thread, with a diameter between 0.03mm and 0.2mm or the spun or twisted weft thread 2 has a textile measurement from 80 to 200 dtex.

Dtex is a unit of measure called the decitex. It gives the weight of a thread in relation to its length. In dtex, this is the weight in grams per 10 kilometers of thread. In general it means that threads with a low dtex are very fine and are therefore expensive, whereas the higher the tex value, the coarser are the fibers. For virgin wool (individual fibers), for example, a value is given between 3 and 6 dtex, while cotton (individual fibers) has a value between 1.5-2.5 dtex only.

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For the fabric combination of polyamide or polyester weft threads 2 and cotton-warp threads 3, it is essential that at least the weft thread 2 is wetted with the bonding agent 17, since the polyamide or polyester does not bond very well with the rubber impression material 5, in particular with rubber or caoutchouc, whereas cotton bonds very well with the rubber impression material 5. It has been shown, in particular, that when the bonding agent 17 is made of RFL, in particular of resorcinol formaldehyde latex, the best bonding properties and the least fraying were achieved in the endurance test. In particular, it is advantageous if the RFL latex is made of between 45 and 60% of water, 0.1 to 0.2% of sodium hydroxide, 2 to 4% of resorcinol formaldehyde resin and 35 to 50% of synthetic latex, in particular SBR latex.

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Preferably, the weft thread 2 is formed as a multifilament, i.e., that the weft thread 2 is made of a plurality of individual fibers. In this case, it is possible that a plurality of individual fibers made of different materials is spun or twisted together to form a weft thread 2. Naturally, it is also possible that the weft thread 2 is made as a monofilament. Furthermore, it is possible that the weft thread 2 is made so that it is oriented or prestretched so that controllable contraction properties are achieved, i.e., the weft thread 2 is cooled down in the extended or stretched state so that, when reheated, it resumes its original shape and, therefore, the contraction is affected or controlled correspondingly. Here, the stretching takes place preferably in the longitudinal direction, that is, in the extrusion direction of the weft thread 2, wherein, however, it would also be possible for the stretching to be transverse to this which would, in particular increase the lateral cross section.

Preferably, the weft thread 2 is arranged in the longitudinal direction of the endless date band so that when the band is stretched, the tensile force is increased. However, it is also possible that the weft thread 2 is arranged transversely or at an angle. It is important that the weft thread 2 is embedded optimally in the impression material 5 to avoid fraying. By arranging lengthwise or transversely, the strength, in particular the tear resistance can be influenced.

Figs. 4 to 6 are illustrations of two different, schematic process for producing the stamp band 1 for an adjustable stamp, in particular an office stamp, wherein, in Figs. 4 and 5, the wetting of the weft thread 2 with the bonding agent 17 is described and, in the Fig. 6, the wetting of the entire fabric 4 with the bonding agent 17 is shown.

As can be seen in Fig. 4, the weft thread 2 consisting of polyamide or polyester is fed out from a supply roll 18 storage container, wherein the weft thread 2 is guided over appropriate diverting elements 19, in particular guides, rollers, etc., through a wetting facility 20. In the wetting facility 20, the bonding agent 17 is applied to the weft thread 2, wherein, to do this, for example, the weft thread 2 is conveyed through the tank 21 filled with bonding agent 17 so that the bonding agent 17 can be applied to the weft thread 2. In order to achieve the complete and uniform application of the bonding agent 17, it is advantageous if the weft thread 2 is conveyed through several tanks 21. Preferably, between the individual tanks 21, the weft thread 2 is guided through drying ovens to dry the applied bonding agent 17 in order to achieve a thicker layer of the bonding agent 17 performing several of these types of step. Wetting facilities 20 such as this are known already in the prior art so that they will not be described in more detail.

To ensure that the bonding agent 17 remains glued to the weft thread 2, subsequent treatment is needed after the application of the bonding agent 17. This involves a first step following the application of the bonding agent 17 in which the weft thread 2 is transferred into a drying plant 20a, in which the liquid bonding agent 17 is dried. However, to ensure that it remains stuck to the weft thread 2 also, it is necessary now that the weft thread 2 is tempered in an annealing facility 20b, i.e., a subsequent, thermal treatment of the bonding agent 17 on the weft thread 2 is performed to activate the bonding strength, wherein, during tempering, the weft thread 2 with the dried bonding agent 17 is heated to a defined temperature so that the bonding properties of the bonding agent 17 are activated and the bonding agent 17 bonds firmly to the weft thread 2.

After the wetting and processing operations, it is possible to roll up the weft thread 2 again on to a supply roll 18 after a drying operation and can then be used for further processing, or is transferred directly to the next operation, in particular the weaving of the fabric 4, as shown here schematically. In the illustrated production process, the weft thread 2 is fed directly into a weaving facility 22 in which the weft thread 2 made of polyamide or polyester and wetted with bonding agent 17 is woven with warp threads 3 consisting of cotton. In this process, a woven hose 23 is formed wherein a continuous weft thread 2 is formed whereas several individual warp threads 3 are used, as illustrated schematically in the diagram. Again, since the weaving process is known in the prior art, it will not be described in further detail.

After the formation of the fabric 4 or of the woven hose 23, the woven hose 23 is placed over a sword 24, as shown schematically by a diagram in Fig. 5. As mentioned, after the weaving process, a vulcanization process is performed wherein the sword 24, now with the woven hose 23 arranged on it and possibly preshrunk by repeated heating, can be inserted in a vulcanizing mold 29 by inserting the rubber impression material 5 in the form of plates 28, wherein several different materials can be used for this purpose. During the vulcanization process, the inserted components are heated under pressure to a defined temperature, so that the inserted plates 28 made of the rubber impression material 5 melt and a stamp band block 30 with embedded woven hose 23 is produced. Simultaneously, the characters, shapes, etc., engraved in or out in the vulcanizing mold 29 are transferred to the melted rubber impression material 5, i.e., the printing characters 8 and possibly the readable characters, the shape of the printing areas 8 and possibly reading areas 9, as well as the cam elements are produced, typical in vulcanization processes known from the prior art.

By using different rubbers in the vulcanization, the surface characteristics inside and outside the stamp band can be deliberately controlled. In doing so, for example, the inside can be optimized in terms of mechanical properties, in particular for increasing or limiting friction or in the outside region for optimizing impression characteristics to adapt the surface tension or optically to obtain a color difference or improved contrast characteristics.

After the conclusion of the vulcanization process and the insert has cooled sufficiently, the produced stamp band block 30 is removed from the vulcanizing mold 29 and supplied to a cutting facility 31. In the cutting facility 31, the stamp band block 30 is cut into the individual stamp bands 1 by means of a knife 32 or cutting device with one or a plurality of knives 32, wherein the sword 24 is removed beforehand. With this, the production process comes to an end and the produced stamp bands 1 can then be installed in the MB's 11. It is important to mention that, in a stamp band block 30, different types of stamp bands 1, such as a plurality of year bands 15, month bands 14, day bands 12, 13 or special bands, can be produced. A production process is shown in Fig. 6 wherein, firstly, the fabric 4 or woven hose 23 is woven from 1 the weft thread 2 and the warp threads 3 in the weaving facility 22 (not shown). At this stage, the weft thread 2 still does not have a bonding agent 17, i.e., the woven hose 23 or fabric 4 consisting of the endless weft thread 2 made of polyester or polyamide and of a plurality of warp threads 3 consisting of cotton, is produced.

Then, the woven hose 23 is pulled on to the sword 24, at which point the sword 24 with the woven hose 23 is introduced into a hose-wetting facility 33. In the hose-wetting facility 33, the bonding agent 17, now located in reservoirs 34, is applied to the woven hose 23 by means of rollers, in particular foam rollers 35. In this process, the foam rollers 35 take up the bonding agent 17 from the reservoir 34 and transfer it to the woven hose 23 which is transported through by the foam rollers 35, i.e., the foam rollers 35 are saturated with the bonding agent 17 and they are then able to transfer this on to the woven hose 23 by means of the foam rollers 35 with which it is in contact. In this process, the foam rollers 35 interact with the woven hose 23, applying a light pressure so that the bonding agent 17 is squeezed out of the foam rollers 35 and, thereby, more bonding agent 17 is applied to the entire fabric 4 or entire woven hose 23.

After the woven hose 23 is wetted, it can travel to another zone where the bonding agent 23 not ' accepted by the woven hose 23 can run off. In doing so, it is possible that, by using a blower the woven hose 23 is contacted with an air flow so that the excess bonding agent 17 is blown off. However, it is also possible that, to strip off excess bonding agent 17, the woven hose 23 is fed through two pressure rollers 37, so that the bonding agent 17, on the one hand, is pressed into the woven hose 23 and, on the other hand, excess bonding agent 17 is stripped off.

It is now possible to perform a drying operation to enable further processing to start sooner so that the bonding agent 17 and the woven hose 23 is dried and activated as soon as possible. It is also possible, however, that drying is done using air only and the activation of the bonding agent 17 takes place in a later operation or that the woven hose 23 still wetted with bonding agent 17 is processed further directly. As described before, after the wetting with a bonding agent 17 and in order to perform further processing by a vulcanization process, subsequent treatment and possibly contraction is needed whereby the woven hose 23 with the sword 24 is placed in the annealing facility 25. This involves heating the woven hose 23 in two steps 26, 27 so that the woven hose 23 is activated and shrunk on to the sword 24 and, in doing so, adopts the size and width of the sword 24. As described before, in the first step 26, the woven hose 23 is heated for 2 minutes at 135° and, in the second step 27, for 2 minutes at 185° to 220°, so that, in the first step 26, the bonding agent 17 is dried and, in the second step 27, the bonding agent 17 is activated so that it adheres to the weft thread 2.

In order to make the stamp band block 30, the woven hose 23 with the sword 24 is now inserted, interposed between the plates 28 of the rubber impression material 5, into the vulcanizing mold 29, so that the vulcanization process can be started, as described above. After the vulcanizing, the produced stamp band block 30 is removed from the vulcanizing mold 29 and transferred to the cutting facility 31. In the cutting facility 31, the stamp band block 30 is cut into the individual stamp bands 1, which marks the end of the production process.

In summary, it can be stated that a method for producing the stamp band 1 for an adjustable stamp, in particular an office stamp, is described in which, firstly, a woven hose 23 is produced from a weft thread 2 and a plurality of warp threads 3, after which the woven hose 23 is placed on a sword 24, and the woven hose 23 is formed with thermal action on the sword 24, after which the sword 24 with the formed woven hose 23 on it is introduced into a vulcanizing mold 29 with a rubber impression material 5 placed on it and then is vulcanized under pressure and heat for a defined period, so that the inserted sword 24 with the woven hose 23 is embedded in the rubber impression material 5, wherein the weft thread 2 is made of polyamide or polyester and has a diameter between 0.03 mm and 0.2 mm or a textile measurement from 100 to 200 dtex, and, before the vulcanization process, the weft thread 2 or the entire woven hose 23 is wetted with a bonding agent 17.

In order to achieve a particularly good bond between the weft thread 2 or woven hose 23 with the rubber impression material 5 and the applied bonding agent 17, an RFL, in particular a resorcinol formaldehyde latex, is used. It has turned out particularly that by using a composition of RFL latex with between 45 and 60% of water, 0.1 to 0.2% of sodium hydroxide, 2 to 4% of resorcinol formaldehyde resin and 35 to 50% of synthetic latex, in particular SBR latex, the fraying of the fabric 5, in particular of the weft thread 2, is prevented. Also, it has been shown as advantageous that the stamp band 1, in particular the fabric 4, is formed from a combination of natural and synthetic fibers, since this achieves a high tear or mechanical strength and very good embedding in the rubber impression material 5.

Naturally, is it is possible that the warp thread 3 is also made from polyamide or polyester or other thermoplastic fibers. It is important that, when using polyamide or polyester as weft threads 2 and/or warp threads 3, special treatment of the weft thread 2 or of the woven hose 23 is performed after the application of the bonding agent 17, involving, firstly, the drying of the bonding agent 17 followed by heating to a temperature of 160° to 250° to activate the bonding agent 17. So-called tempering has the advantage that, in doing so, the adhesion of the bonding agent 17, in particular the RFL coating, is produced on the weft thread 2 and/or woven hose 23. Therefore, it is possible to use the fabric 4 or weft thread 2 wetted with bonding agent 17 for a stamp band 1 exclusively with printing characters 6 and also for a stamp band 1 with printing characters 6 and readable characters 7.

In conclusion it should be pointed out for the record that, for a better understanding of the construction of the facilities or systems and their components or their component parts, in places they were not illustrated to scale and/or they were enlarged and/or reduced in size.

Furthermore, individual features or combinations of features from the illustrated and described different embodiment examples may, as such, also form stand-alone, inventive solutions or ones falling under the invention.

Claims (14)

Piston ribbons (1) for adjustable pistons, in particular for date pistons comprising at least one fabric (4) consisting of a thread (2) and a plurality of warp threads (3), in particular of a cut tissue tube (4) embedded in a rubber print material (5) by means of a vulcanization process, wherein a plurality of printing characters (6) for a stamp print and / or any legible characters (7) for a reading area (9) are formed in the rubber print material (5), characterized in that the firing wire ( 2) is made of polyamide or polyester, and the warp threads (3) are made of cotton and the filament thread (2) has a diameter between 0.03 mm and 0.2 mm or a textile measuring unit from 80 to 200 Dtex, and the filament thread (2) ) or the entire fabric (4) is wetted with an adhesive (17). Piston belt (1) according to claim 1, characterized in that the adhesive (17) is made of RFL, in particular resorcinol formaldehyde latex. Piston strip (1) according to claim 1 or 2, characterized in that the RFL latex is made of 45 to 60% water, 0.1 to 0.2% sodium hydroxide, 2 to 4% resorcinol formaldehyde resin and 35 to 50% synthetic latex, especially SBR latex. Piston belt (1) according to any one or more of the preceding claims, characterized in that the firing wire (2) is made of polyamide or polyester fibers, thereby forming this monofilament or multifilament. Stamping strip (1) according to any one or more of the preceding claims, characterized in that the printing characters (6) and / or optionally the readable characters (6) are formed by individual blocks or areas on the outer side of the stamping strip, respectively. (1). Piston belt (1) according to any one or more of the preceding claims, characterized in that there is always an exchange between a block with a print character (6) and a block with a readable character (7). Piston belt (1) according to any one or more of the preceding claims, characterized in that centering and / or carrier elements (10) are provided on the opposite side of the printing characters (6), i.e. on the inside. Piston belt (1) according to any one or more of the preceding claims, characterized in that the rubber print material (5) is formed of colored rubber. Piston strip (1) according to any one or more of the preceding claims, characterized in that the block of the readable sign (7) is marked in a different color from the color of the rubber print material (5). Piston belt (1) according to any one or more of the preceding claims, characterized in that the block for the readable sign (7) is marked with a preferably glued cover layer. A method of manufacturing a piston belt (1) for an adjustable piston, in particular an office piston, wherein first a tissue hose (23) is made from a shot thread (2) and several warp threads (3), after which the tissue hose (23) is applied to a rod bar (24) and tissue tubing (23) are thermally molded onto bar bar (24), after which bar bar (24) with barrel (23) molded thereon is inserted into a vulcanization mold (29) together with rubber printing material (5), followed by pressure vulcanization and heating over a defined period of time so that the inserted bar sword (24) with the tissue hose (23) is embedded in the rubber print material (5), characterized in that the shot wire (2) is made of polyamide or polyester and has a diameter between 0.03 mm and 0 mm. , 2 mm or a textile measuring unit from 80 to 200 Dtex and the weft thread (2) or the entire tissue tube (23) is moistened with a staple (17) prior to the vulcanization process. Method according to claim 10, characterized in that an RFL is used as an adhesive (17), in particular of resorcinol-formaldehyde latex. Process according to claim 10 or 11, characterized in that the RFL latex is made from 45 to 60% water, 0.1 to 0.2% sodium hydroxide, 2 to 4% resorcinol-formaldehyde resin and 35 to 50% synthetic latex, in particular SBR latex. Process according to any one or more of the preceding claims, characterized in that, after the vulcanization process, the piston tape block (30) is cut into individual piston bands (1). in