Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G1/00—Driving-belts
  • F16G1/14—Driving-belts made of plastics
  • F16G1/16—Driving-belts made of plastics with reinforcement bonded by the plastic material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D29/00—Producing belts or bands
  • B29D29/08—Toothed driving belts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G1/00—Driving-belts
  • F16G1/06—Driving-belts made of rubber
  • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G1/00—Driving-belts
  • F16G1/06—Driving-belts made of rubber
  • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
  • F16G1/10—Driving-belts made of rubber with reinforcement bonded by the rubber with textile reinforcement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G1/00—Driving-belts
  • F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G5/00—V-belts, i.e. belts of tapered cross-section
  • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2029/00—Belts or bands

Definitions

• the invention relates to a power transmission belt with an elastic substructure made of cast polyurethane and a force transmission zone formed thereon and with a textile support in contact with this power transmission zone, a plurality of methods for its production and an associated, multi-layer impregnated Riementextil.
• Textile coatings on belts have the primary purpose of reducing wear and, in the case of toothed belts, suppressing the tearing tendency at the edges of the teeth and the tearing tendency in the event of damage in the tooth outer edge.
• Polyurethane belts are generally poured directly onto the textile overlay so that the polyurethane on the overlay reacts, cross-links and solidifies. It penetrates at least partially into the textile and through it. If, in the course of use, the abrasion-resistant and optionally friction-reducing textile support is somewhat worn away, the belt polyurethane, which as a rule has a very high coefficient of friction, comes into direct contact with the power transmission or toothed disk so that the friction abruptly occurs there elevated. This is undesirable.
• CONFIRMATION COPY and penetrates into the textile edition with co-crosslinking.
• the method is not suitable because it prevents the desired mechanical interlocking between polyurethane and textile and shortens the durability or maximum life of the belt.
• the invention has the object of developing a belt of the type mentioned so that a significant improvement in runtime is achieved over the life largely consistent performance characteristics.
• the abrasion strength of the Riementextiis increased and an increase in the coefficient of friction over the term can be avoided or reduced.
• the above problem is solved by the belt on the outer surface of the textile support has an at least partially penetrated into the textile, there forming an impregnation first coating of a first thermoplastic material, further on the first coating, a second coating is made of a second thermoplastic material.
• the melting temperature of the second thermoplastic material is higher than that of the first thermoplastic material and preferably remains below 150 ° C, while the first thermoplastic material has a melting temperature of from 80 ° C to about 145 ° C.
• the melting point is determined, for example, by means of differential scanning calorimetry (DSC) at ambient pressure.
• the impregnation of the first coating serves at the same time to form a barrier zone for penetrating from the other side of the fabric when pouring polyurethane, thereby additionally to give by reinforcing the fabric with a filler material a further mechanical interlocking between polyurethane and impregnated textile and finally the fibers of Textile on the belt surface to fix.
• the latter happens below the second coating, which is preferably thin and will wear off quickly in the course of use, or which alternatively may be withdrawn prior to use of the belt if the coatings are peelable with each other.
• the two-layer finish of the fabric wherein the first coating at least partially forms an impregnation within the textile structure, causes the second coating, which forms a closed coating blanket as a coating with a thermoplastic material, to prevent the polyurethane from completely draining the textile cover during casting penetrates or even reaches its outer surface and forms a film there. Rather, the cast polyurethane is retained in the impregnated zone and penetrates maximally to the outer surface of the fabric support without fully penetrating or passing outside onto the surface.
• the second coating itself has a coefficient of friction which gives the belt good performance and, in any case, is well below the coefficient of friction of a polyurethane.
• the (sliding) coefficient of friction of the second coating is preferably below 0.45 and in each case preferably below 0.3. It is not a disadvantage if the second coating is thin and is removed relatively quickly by abrasion in use.
• the abrasion-resistant textile After removal of this second coating, the abrasion-resistant textile reaches the belt surface, primarily with its zone impregnated with the first coating. Although cast polyurethane can be penetrated into this zone, this is only the case to a relatively small extent, so that the high coefficient of polyurethane friction is due to a low coefficient of friction of the thermoplastic material of the second coating and / or friction-reducing properties of the abrasion-resistant textile of the textile cover can be compensated.
• the friction coefficient of the second coating is also below 0.45, more preferably below 0.3.
• thermoplastic materials of both the first and second coatings may be modified with a friction reducing additive.
• the friction-reducing additive may in particular be polyolefin fluorides, such as, preferably, PTFE, polyvinyl chloride, graphite, silicone, molybdenum sulfite or other known friction-reducing additives, or mixtures of these additives. Friction reducing additives are known in the art.
• the further addition of thermoplastic materials which is always possible, does not need to be specified here.
• thermoplastic material of the first coating or the first thermoplastic material is preferably a copolyamide.
• Copolyamides here are understood as meaning both polymers of more than two different monomer types which polymerize to give polyamide and also mixtures of several such polymers.
• the copolyamides may in principle consist of one or more diamines in conjunction with one or more dicarboxylic acids or lactams, optionally in combination with one or more - aminocarboxylic acids, other amino-substituted carboxylic acids, etc.
• caprolactam / hexamethylenediamine / adipic acid For example only: caprolactam / hexamethylenediamine / adipic acid; Hexamethylenediamine / adipic acid / -Se-baccinic acid; Hexamethylenediamine / tetramethylenediamine / adipic acid; Hexa-methylenediamine / tetramethylenediamine / acetic acid; and products of dicaboxylic acids, diamines and alpha- Aminocarboxylic acids or lactams with aliphatic, cycloaliphatic or aromatic amines and / or carboxylic acid, preferably in each case having 6 to 20 carbon atoms per monomer unit.
• copolyamides are also understood mixtures of several of the aforementioned copolyamides.
• copolyamides are understood as meaning copolymers of polyamide units and further copolymerizable units and mixtures of copolyamides, as described above, with other polymers, each having a polyamide content of at least 50% by weight.
• the thermoplastic material of the first coating preferably has a melting point between 80 and 145 ° C, more preferably between 90 and 145 ° C, more preferably between 90 and 135 ° C, more preferably between 100 and 135 ° C and especially between 100 and 130 ° C.
• thermoplastic material of the first coating is at least largely or completely melted in the power transmission belt according to the invention in the textile support, which is effected as described in more detail below by special production processes or pretreatment steps of the textile.
• the surface of the textile surface facing the adjoining polyurethane preferably remains practically free of the first thermoplastic material (the impregnation material).
• the thermoplastic material of the first coating is preferably present at a weight per unit area of up to 200 g / m 2. up to 100 g / m2 in the textile layer.
• the second thermoplastic material for the second coating which preferably has a melting point below 150 ° C, more preferably to at most 145 ° C and especially to 140 ° C, for example, a polyolefin, such as a polyethylene or polypropylene, alternatively a polyamide or a Polyester.
• a polyolefin such as a polyethylene or polypropylene
• Suitable are all higher melting thermoplastic materials which form closed surfaces, that is impermeable to cast polyurethane, and which have relatively low coefficients of friction, as mentioned above, preferably in the range below 0.45.
• Suitable materials are in particular high-density polyethylenes and other crystalline or partially crystalline homopolymeric polyolefins.
• a third layer may be arranged as an intermediate layer between the first coating and the second coating of the textile support. This is preferably a primer layer between the first and the second thermoplastic material.
• the intermediate layer may preferably be a primer layer which effects adhesion between the first coating and the second coating.
• the first coating is a copolyamide and the second coating is a polyolefin, in particular HDPE
• the intermediate layer can consist, for example, of LDPE or modified LDPE. Suitable adhesion promoters for HDPE are known to the person skilled in the art.
• the modification of the LDPE may be a maleic acid modification.
• the second coating has a thickness of up to 200 ⁇ m, preferably up to 100 ⁇ m. It is preferably thin and in a particularly preferred embodiment has a thickness of preferably 10 to 50 ⁇ . In these preferred embodiments, it is contemplated that the thin second coatings remain on the power transmission belt and are rapidly removed, while in other embodiments the thick second coatings are preferably removed prior to use, for example peeled off.
• the textile of the textile cover may be a woven fabric, a knitted fabric, a knitted fabric or a nonwoven, preferably a fabric. These may be conventional belt textiles, as known to those skilled in the art. Preference is given to textiles made of synthetic fibers or a synthetic fiber mixture, wherein the textile cover consists of these fibers or contains them. Particularly preferred synthetic fiber materials are made of polyamide or polyester or contain such fibers as, for example, polyamide 6.6, meta-aramid, para-aramid, nylon 4.6, which may be provided with friction-reducing materials such as polytetrafluoroethylene (PTFE). In this case, PTFE threads are preferably incorporated into the textile, as shown, for example, in WO 03/031700 A1.
• Riementextiis containing PTFE filaments or filaments is particularly advantageous in the power transmission belt according to the invention, because the impregnation zone of the first coating together with the PTFE-containing textile produces a particularly high abrasion resistance. Although small amounts of polyurethane can be penetrated into this zone. However, the adverse effect on the coefficient of friction is due to the optionally friction-reducing modified thermoplastic material. rial of the first coating in connection with the polytetrafluoroethylene fibers from the textile more than offset.
• the power transmission belt can basically correspond to any known type and in particular be a flat belt, V-belt or toothed belt. Timing belts are particularly preferred since the advantages of the belt text are particularly important here.
• the invention further includes methods of making the multi-layered textile equipment.
• a first and a second coating are sequentially applied to a surface of the fabric overlay, wherein at least the first coating is thermally fixed such that the first coating at least partially, i. preferably to at least 50% of its weight penetrates into the textile cover and impregnates this surface, and that the polyurethane is poured in a further step on the opposite surface of the textile cover.
• the belt is manufactured in a known manner.
• the prepared by the process textile overlay is turned and placed in a corresponding shape, so that the double-coated side is in the form below, while the non-impregnated side is on top.
• the polyurethane is poured onto the textile support on the non-impregnated side and cures there in the desired Shape out.
• the polyurethane of the power transmission zone can, as usual, form the polyurethane of the entire substructure. It can at the same time incorporate the tension members, unless a separate mixture is provided for this purpose.
• the belt is then built up as usual and may optionally have a second cover on the back of the belt.
• thermoplastic materials are applied to the textile support, namely to the later outer side, is initially arbitrary.
• the thermoplastic materials can be dissolved in solvent, brushed or scrape, or sprinkled as a powder or granules and thermally fixed. However, these procedures are not preferred.
• first and second coatings as films to the textile support and to fix them there. This is generally done with heat, the film for the first coating melts or melts and thereby penetrates into the textile structure of the textile cover.
• the application of the coatings can be assisted with pressure. It is possible to work at a lower temperature with higher pressure or at a slightly higher temperature and lower pressure. A support of the fixation by negative pressure from the textile underside ago, is possible.
• first the first coating is applied, preferably in the form of a film, and fixed.
• the second coating is applied in the form of another film.
• the fixation of the second film on the first can be done with the help of adhesion promoter.
• the second film of the film for the second coating and a primer layer, wherein this second two-layer film then with the adhesion promoter side on the first coating is applied and thermally fixed there.
• the method is performed so that an at least two-layered film is applied to a surface of the textile cover prior to casting of the polyurethane, wherein a first, the textile-facing layer of this film has a melting point of from 80 ° C to about 145 ° C and a second textile facing layer of the film has a higher melting point than the first, and that the film is thermally fixed to the textile support, so that the first film layer at least partially - preferably at least 50% of their weight - in the textile melts while the layer covers the impregnated textile.
• the second layer does not melt or does not melt significantly into the textile.
• the properties of the layers may be as described above for the coatings.
• the prepared textile is further used, as in the process already described above, i. the polyurethane is poured from the uncoated side.
• the multilayer film according to the last-mentioned method aspect is preferably provided completely or partially as a coextruded multilayer film and applied to the textile support.
• a three layer film two or three layers may be coextruded.
• the multilayer film is three-layered, it preferably has an adhesion promoter layer as intermediate layer between the first and second layer.
• the primer layer has already been described above.
• the second layer is peelable from the first.
• the second Layer or multiple outermost layers are then stripped from the belt after casting the polyurethane leaving the first layer as an impregnating coating on the fabric overlay.
• the second coating primarily serves the purpose of avoiding complete penetration of the polyurethane through to the surface of the textile support through the first impregnation. After this purpose is satisfied and that belt polyurethane is cured, the second layer can be removed.
• the invention further comprises a belt textile, in particular a toothed belt textile, for use as a textile support in a power transmission belt according to the invention.
• the garment textile according to the invention is a synthetic fiber textile which optionally contains admixtures of other fibers, e.g. of natural fibers, such as cotton fibers. Preferably, the sum of the admixtures is at most 40% by volume.
• This Riementextil invention carries an at least two-layer coating with a first, at least partially penetrated into the textile first thermoplastic material having a melting point from 80 ° C to about 145 ° C, preferably from 90 ° C to about 145 ° C, more preferably from 90 ° C to about 135 ° C, especially 100 to 130 ° C and a second, lying on the belt surface thermoplastic material having a melting point which is higher than that of the first thermoplastic material, and preferably less than 150 ° C.
• Figure 1 a textile overlay with applied, three-layer film of thermoplastic materials
• Figure 2 the textile support of Figure 1 with molten multilayer film and thereby melted first layer;
• Figure 3 the textile support of Figure 2, turned, with infused polyurethane
• FIG. 5a
• Figure 1 shows a schematic diagram of a cross section through a textile support (1) on which a three-layer film (2) from the film layers (22, 24, 26) is placed.
• the textile cover (1) facing and on the first surface (11), the later outer surface of the power transmission belt, resting, there is a first layer (22) of a first thermoplastic material, after fixing the multilayer film (2), the first coating with will form an impregnation zone shown in more detail in Figure 2.
• the second layer (24) is also after fixing the Multilayer film-closed thermoplastic cover layer and the layer (26) is an intermediate layer, here an adhesive layer to the copolyamide of the layer (22), which allows a peel against layer (24).
• Figure 2 shows the embodiment shown in Figure 1, after applying heat and optionally pressure on the surface of the multilayer film.
• the first layer (22) melts into the textile support (1), so that the thermoplastic material (22 ') of this first layer is distributed in a surface zone of the textile support (1) and forms an impregnation zone. This impregnation zone does not extend to the opposite surface (12) of the textile cover (1).
• Figure 3 shows the example of Figure 2 turned. And after pouring the polyurethane (30), which forms an adjacent to the textile support (1) power transmission zone (3) of a power transmission belt, not shown.
• the belt polyurethane penetrates the textile cover (1) and, to a large extent, also the impregnation zone in which the textile is impregnated with the first thermoplastic material (22 ').
• the layers (26 and 24) prevent, however, that the polyurethane could completely penetrate through the textile support (1) or even spread on its surface. If the multilayer film (2) has been pressed under pressure onto the textile cover (1), an additional superficial compression of the textile material of the textile cover (1) can take place, which additionally retains the polyurethane and provides a polyurethane-free compacted surface.
• Figure 4 shows the textile support (1) in contact with the power transmission zone (3) of the power transmission belt, not shown.
• the textile cover (1) is penetrated in the boundary region of the polyurethane (30), but not completely extends to the outer surface (1 1), were previously bonded to the layers (26 and 24) on the surface.
• the impregnation zone in which the first thermoplastic material (22 ') is located is partially penetrated by the polyurethane.
• the thermoplastic material (22 ') serves to fix the fibers (16) of the textile fabric over the entire region of the impregnation zone.
• Figures 5a) to 5c) show the application of the invention in standard belts.
• the textile cover (1) covers each of the power transmission zones 3 of the belt substructures. Shown is also the belt-typical arrangement of reinforcements 4.
• Figure 5a) shows a V-belt with complete textile casing.
• the textile cover 1 encloses the belt completely.
• FIG. 5b) shows a toothed belt with teeth 5 arranged in the transverse direction and longitudinal reinforcements 4.
• the textile support (1) covers the entire tooth surfaces with valleys, splashes and flanks.
• Figure 5c) shows a flat belt whose textile support (1) is limited to the inner surface.
• Figures 1 to 3 show cutout areas corresponding to the dashed lines in Figure 5.
• the fiber fixation causes a significant increase in the life of the belt.
• the properties of the belt therefore remain unchanged for a long time.
• a polyurethane timing belt was equipped in the following way:
• Foil overlay multilayered:
• copolyamide film 50 ⁇ m, melting point: 1 10-120 ° C;

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Laminated Bodies (AREA)
• Belt Conveyors (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (11)

Cited By (2)

Families Citing this family (7)

Citations (9)

Family Cites Families (18)

• 2011
  • 2011-12-20 DE DE102011121656A patent/DE102011121656A1/de not_active Withdrawn
• 2012
  • 2012-12-17 WO PCT/EP2012/005191 patent/WO2013091808A1/de not_active Ceased
  • 2012-12-17 CN CN201280062547.3A patent/CN104011429B/zh active Active
  • 2012-12-17 AU AU2012359249A patent/AU2012359249B2/en active Active
  • 2012-12-17 CA CA2858860A patent/CA2858860C/en active Active
  • 2012-12-17 PL PL12812170T patent/PL2795155T3/pl unknown
  • 2012-12-17 IN IN1270KON2014 patent/IN2014KN01270A/en unknown
  • 2012-12-17 MX MX2014006946A patent/MX341862B/es active IP Right Grant
  • 2012-12-17 US US14/366,703 patent/US9644706B2/en active Active
  • 2012-12-17 ES ES12812170T patent/ES2570563T3/es active Active
  • 2012-12-17 EP EP12812170.4A patent/EP2795155B1/de active Active

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