Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
  • B05C1/003—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating incorporating means for heating or cooling the liquid or other fluent material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/44—Compression means for making articles of indefinite length
  • B29C43/46—Rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
  • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
  • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
  • B05C1/0808—Details thereof, e.g. surface characteristics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
  • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
  • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
  • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
  • B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
  • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
  • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
  • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
  • B29C43/24—Calendering
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
  • B29C43/28—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/34—Feeding the material to the mould or the compression means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
  • B32B5/024—Woven fabric
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/38—Pressure-sensitive adhesives [PSA]
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/44—Compression means for making articles of indefinite length
  • B29C43/46—Rollers
  • B29C2043/461—Rollers the rollers having specific surface features
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/44—Compression means for making articles of indefinite length
  • B29C43/46—Rollers
  • B29C2043/461—Rollers the rollers having specific surface features
  • B29C2043/462—Rollers the rollers having specific surface features smooth surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/0097—Glues or adhesives, e.g. hot melts or thermofusible adhesives
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0037—Other properties
  • B29K2995/0072—Roughness, e.g. anti-slip
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0037—Other properties
  • B29K2995/0072—Roughness, e.g. anti-slip
  • B29K2995/0073—Roughness, e.g. anti-slip smooth
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/718—Weight, e.g. weight per square meter
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2405/00—Adhesive articles, e.g. adhesive tapes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2400/00—Presence of inorganic and organic materials
  • C09J2400/20—Presence of organic materials
  • C09J2400/26—Presence of textile or fabric
  • C09J2400/263—Presence of textile or fabric in the substrate
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2400/00—Presence of inorganic and organic materials
  • C09J2400/20—Presence of organic materials
  • C09J2400/28—Presence of paper
  • C09J2400/283—Presence of paper in the substrate

Definitions

• the present invention relates to a calendering apparatus, configured and adapted for processing a tackified or interesting fluid, wherein the processing typically includes forming the fluid into a film of defined film thickness, applying the fluid to a substrate, recalendering, or a combination of at least two of the aforementioned processes, comprising a feed device for feeding the fluid, a multi-roll mill having at least two calender rolls and at least one calendering nip for processing the fluid.
• the invention further relates to a calendering process for processing a tackified or self-sticky fluid, the processing comprising forming the fluid into a film of defined film thickness, applying the fluid to a substrate, post calendering or a combination of at least two of the foregoing processes, and an adhesive tape with an adhesive obtained by this method.
• Roll coating involves a wealth of technologies that allow polymers to be formed and wound by means of two or more rollers or applied to a support.
• Coating calender in the rubber industry of forming and coating polymers on sheet materials, e.g. on fabric or nonwovens.
• the rolls are generally designed to be heatable in order to enter temperature into the polymer. This typically makes the polymer less viscous and easier to mold. This allows easier roll design and reduces capital and operating costs.
• multi-roll calenders are preferably used in the case of high-viscosity polymers.
• the order weight gradually reduced to the target weight by increasing differential speeds (friction) of the follower rollers.
• Difficulties can arise if the polymers are tacky at the processing temperature and tend to stick to the rolls. Examples include certain rubber or PVC mixtures and in particular also adhesives. The stickiness which is disturbing in this respect can be avoided within certain limits by a specific adjustment of the temperatures and frictions and possibly further process parameters.
• antiadhesive treated rolls are used for the processing of highly adhesive formulations. Examples of this are e.g. in EP 2 192 148 B1, p.13, lines 16-41.
• these rollers usually have the disadvantage that their service lives are limited, since their anti-adhesive effect decreases over time and the antiadhesive components wear over time or be leached out.
• the selection of a stably functioning in the production process variant is very complex, since so equipped coating rollers to take over the preformed film first from the previous roller well and completely and then have to pass completely residue free again to the next following roller.
• the process window is therefore very limited and only applies recipe and process specific.
• Another problem is the anchoring strength of the polymer on the substrate.
• cost-effective pretreatment with corona, plasma or flame pretreatment often does not produce the desired result.
• the object of the invention is therefore to allow the processability of highly tacky polymers and their sufficient bond strengths on nonwovens and fabrics in the roll process.
• This relates, on the one hand, in particular to the shaping of the polymers into a film of defined layer thickness by preforming in the nip and the transfer to one or more subsequent rolls with graduated rotational speeds.
• the known, already mentioned manipulated variables for improving the processability are often not sufficient here.
• the transfer of the shaped melt film from the last calender roll to the web-shaped carrier material is considered.
• the known methods in particular with open or structured carrier materials, e.g. in the case of woven and nonwoven materials with small pore sizes, no sufficient bond strength can be achieved since, due to the process, only a limited line pressure can be applied. If this is too low and the viscosity of the polymer melt too high and the hydraulic diameter of the pores too small, then the melt can not penetrate sufficiently into the carrier openings.
• a calendering device of the type mentioned in the introduction in that at least one of the at least two calendering rolls has an average roughness depth Rz between 5 ⁇ m and 15 ⁇ m, in particular between 9 ⁇ m and 13 ⁇ m.
• the mean roughness Rz is defined as:
• Rz 1 / n- (Rzi + Rz2 + Rz3 + ... Rz n ), ie the average value of the individual roughness depths of the respective roller measured at different points, where n is the number of measured values.
• the measurement is carried out according to the specifications of DIN EN ISO 3274.
• all calendering rolls independently of each other, have an average roughness R z between 5 pm and 15 pm, in particular between 9 pm and 13 pm, ie all calendering rolls are preferably designed according to the invention.
• At least two of the at least two calendering rollers are calendering rollers in the calendering device.
• the material used for the roller base body is typically steel.
• Metallic surfaces are particularly suitable as the surface of the calendering rollers, so that in the case of the calendering device according to the invention at least one of the at least two calendering rollers has a metallic surface.
• metallic surfaces in particular steel or chromium come into question.
• Hard-material rolls, in particular those having a surface made of metal carbide, are particularly suitable, as are rolls with a chrome surface.
• rollers used according to the invention are therefore preferably steel rollers, chromium-plated steel rollers and hard-material rollers with strength-imparting metal carbides.
• tungsten carbide surfaces may be mentioned here.
• a particularly good process control in calendering can be achieved if at least one of the at least two calender rolls is designed to be heatable. With a variable roll temperature, another parameter is given which influences the calendering process and thus the resulting product can.
• the rolling temperatures of the heatable calendering rollers are preferably selected independently of one another in the range from 50 to 150 ° C., in particular in the range from 80 to 120 ° C.
• the calendering device further comprises at least one polymer counter roll.
• This serves as a further roll nip and also, in particular, for guiding a carrier material to which the polymer is applied.
• any fluid polymers can be processed.
• the calendering device for fluids selected from the group comprising tacky or tackified compositions, in particular pressure-sensitive adhesives based on rubbers, synthetic rubbers, polyurethanes, epoxides, ethylene-vinyl acetates, poly (meth) acrylates and mixtures thereof.
• the device according to the invention is suitable for highly tacky polymers which can not be processed satisfactorily with conventional calendering devices.
• the polymers which can be processed particularly advantageous with the inventive device in a viscosity range from 500 to 150,000 Pa * s at the respective coating temperature and 1 rad / s.
• the object of the present invention is further achieved by a calendering process for processing a tackified or interesting fluid, wherein the processing comprises forming the fluid into a film of defined film thickness, applying the fluid to a substrate, recalendering, or a combination of at least two of comprising the above-mentioned processes, by performing the method on a device as described above.
• the preferred embodiments of the calendering apparatus also apply to the calendering process and vice versa.
• the polymer processed by the process according to the invention in particular polyacrylate, can be used outstandingly as a pressure-sensitive adhesive, preferably as a pressure-sensitive adhesive for an adhesive tape, the pressure-sensitive adhesive being present as a single-sided or double-sided film on a carrier film.
• exemplary applications are technical adhesive tapes, in particular for use in construction, eg Insulating tapes, anti-corrosion tapes, aluminum adhesive tapes, fabric-reinforced tapes, building tapes, eg vapor barriers, assembly tapes, cable wrapping tapes, self-adhesive foils and / or paper labels and applications for the automotive industry for fixing parts or sheathing of cables.
• the polymer processed by the process according to the invention in particular rubber or synthetic rubber, can be used outstandingly as a pressure-sensitive adhesive, preferably as a pressure-sensitive adhesive for an adhesive tape, the pressure-sensitive adhesive being present as a single-sided or double-sided film on a support film.
• a pressure-sensitive adhesive preferably as a pressure-sensitive adhesive for an adhesive tape
• the pressure-sensitive adhesive being present as a single-sided or double-sided film on a support film.
• Exemplary applications are technical adhesive tapes, in particular for use in construction, e.g. Tissue tapes, tissue-reinforced tape tapes, vapor barriers, but also mounting tapes, cable tapes, as well as applications for fixing parts or sheathing of cables.
• the calendering device according to the invention and the calendering process according to the invention not only is the processability of the polymer composition improved, in particular because no polymer constituents adhere to the rolls. Rather, an improvement in the properties of the products obtained can be achieved.
• the anchoring strength of the polymer on the carrier material is improved when the calendering device according to the invention is used.
• the present invention therefore furthermore relates to an adhesive tape comprising a pressure-sensitive adhesive prepared by the calendering process described above.
• adhesive tapes contain at least one carrier material.
• the carrier material used is preferably tissue, in particular cotton fabric, knitted fabric, non-woven or paper in their different embodiments.
• Such an adhesive tape preferably has a basis weight of between 55 and 120 g / m 2 .
• the basis weight refers to the application of the adhesive layer, not to the entire adhesive tape with carrier.
• Such basis weights were not permanently stable in the calendering process with the known methods and devices in the case of the described, particularly sticky polymers and / or open or structured support materials.
• Adhesive tapes according to the invention which have at least one carrier are distinguished by a high bond strength of the pressure-sensitive adhesive and the carrier material. Bond strength, also referred to as anchor strength, describes the force required to release the adhesive from the substrate. The bond strength should always be higher than the cohesion of the adhesive and the adhesion of adhesive to the substrate.
• the bond strength that can be obtained with the device according to the invention and the method according to the invention is preferably at least 17 N / cm.
• the roughness of the rollers used is measured by means of a profilometer.
• Test device was the Mahr MarSurf PS1 of Mahr GmbH, Göttingen. The measurement was carried out according to specifications from DIN EN ISO 3274.
• the peel forces against a defined adhesive tape were determined at processing temperatures. If a measurement in the processing conditions was not feasible, the measurements were taken at the next possible temperatures.
• test strip of the adhesive tape of 19 mm was rolled over onto the tempered roll body by means of a pressure roller (2 kg) in 3 passes at a speed of 5 m / min in the machine running direction and fixed. Immediately thereafter, at a defined speed (0.3 - 5 m / min) at a draft angle of 90 °, the pull-off force was measured in g using a spring balance. Measured value and fracture pattern are documented. Test Method III - Viscosity
• the viscosity measurement is carried out with a cone-plate system with a diameter of 50 mm with a rheometer of the type ARES (Rheometric Scientific) at 1 15 ° C and at a shear rate of 1 s. 1
• a 10 mm wide sample of the coating pattern is fixed on a steel plate with a double-sided adhesive tape.
• the tesa test tape 7476 is then rolled over a total of 10 times using a steel roller weighing 2 kg at a speed of 10 m / min and fixed.
• the anchoring force of the test tape on the composite is determined on a Zwick tensile testing machine at a peel angle of 180 ° C at 23 ° C / 55% rh and a peel rate of 500 mm / min.
• the anchoring force is determined in N / cm.
• the viscosity was determined to be 17,000 Pa * s at 15 ° C and 1 rad / s shear rate.
• the adhesive was previously prepared in a 25I kneader from AMK and in siliconized cardboard boxes with dimensions 50 * 50 * 1000mm bottled.
• This strand-shaped adhesive is fed into a melt extruder from Troester (GS60 * 10D) and fed at a temperature of 120 ° C at 45 kg / h throughput in the dosing of a 3-roll L calender.
• FIG. 1 The structure of the calender used in Examples 1 to 4 is shown in FIG. 1:
• the 1 . Roller 1, the so-called metering roller is equipped with a polished chrome surface
• the second roller 2, the transfer roller, and the third roller 3, the transfer roller are equipped with chrome surfaces with averaged roughness Rz of about 1 pm
• the carrier web 6 of 120 mesh staple wool runs on an 80 ° Sh
• a polymer backing roll 4 in the nip and is intended to completely remove the adhesive 5 from the transfer roll.
• the web speed is set at 15 m / min, the application weight on the fabric is 100 g / m 2 .
• the metering roller 1 is operated stationary, the transfer roller 2, however, with 20% of the web speed, the transfer roller 3 is operated in synchronism with the web.
• Example 3 Starting from Example 3, rolls 2, 3 with an average roughness depth of about 10 pm were again used in the calender.
• the carrier material 6 used was a 150 mesh cotton fabric, and the same experimental setup and process parameters as in Example 1 were chosen.
• the coating of the carrier material succeeds with a closed, uniform adhesive layer with a coating weight of 100 g / m 2 .
• the desired bond strength is 17 N / cm.
• FIG. 2 The structure of the calender used in Examples 5 to 7 and the post-calendering plant is shown in FIG. 2:
• the construction of the calender corresponds to that shown in FIG.
• the apparatus shown in Fig. 2 comprises a post-calendering unit.
• Example 4 Starting from Example 4 again rolls 2, 3 were used with an average roughness Rz of about 10pm in the calender.
• support material 6 a 150 mesh cotton fabric was again used, and the same experimental set-up and the same process parameters as in example 4 were selected.
• the composite is transported immediately after leaving the calendering plant in a tempered 2-roll nip ("post-calendering mill"). This is positioned with a rubber roller 7 of 90 ° ShA hardness to the back of the carrier web 6 and with the adhesive side of the carrier web 6 to a steel roller 8 with an Rz number of 9pm.
• the temperatures are 80 and 120 ° C (rolls 7 and 8), the line pressure is 50 N / cm.
• the coating of the carrier material succeeds with a closed, uniform adhesive layer of 100 g / m 2 coating weight.
• the material does not stick to the steel roller.
• For the bond strength values of 17.2 and 18.0 and 17.9 N / cm are determined in the fresh state.
• the desired bond strength is 17 N / cm.
• Example 5 Starting from Example 5, rolls 2, 3 with an average roughness Rz of about 10 pm were again used in the calender.
• a carrier material again a 150mesh cotton fabric was used, otherwise the same experimental setup and the same process parameters as in Example 4 were chosen.
• the composite is moved immediately after leaving the calendering plant in a Nachkalandrierwerk.
• This is positioned with a rubber roller 7 of 90 ° ShA hardness to the back of the carrier web 6 and with the adhesive side of the carrier web 6 to a steel roller 8 with an Rz number of 0.2 pm.
• the temperatures are 80 and 120 ° C (rolls 7 and 8), the line pressure is 50 N / cm.
• the coating of the carrier material succeeds with a closed, uniform adhesive layer of 100 g / m 2 coating weight. The material adheres but on the steel roller 8, an evaluation of the bond strength is not possible.
• Example 5 Starting from Example 5, rolls 2, 3 with an average roughness Rz of about 10 pm were again used in the calender.
• a carrier material again a 150mesh cotton fabric was used, otherwise the same experimental setup and the same process parameters as in Example 4 were chosen.
• the composite is moved immediately after leaving the calendering plant in a Nachkalandrierwerk. This is positioned with a rubber roller 7 of 90 ° ShA hardness to the back of the carrier web 6 and with the adhesive side of the carrier web 6 to a steel roller 8 with an Rz number of 23 pm.
• the temperatures are 80 and 120 ° C (rolls 7 and 8), the line pressure is 50 N / cm.
• the coating of the carrier material succeeds with a closed, uniform adhesive layer with a coating weight of 100 g / m 2 .
• the material does not stick to the steel roller 8.
• viscosities in the range of 500 to 150,000 Pa * s can be calendered in a stable and process-reliable manner at 1 rad / s shear rate and processing temperature.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Adhesive Tapes (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

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