Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B7/00—Mixing; Kneading
  • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
  • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
  • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
  • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
  • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
  • B29B7/487—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with consecutive casings or screws, e.g. for feeding, discharging, mixing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B7/00—Mixing; Kneading
  • B29B7/002—Methods
  • B29B7/007—Methods for continuous mixing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B7/00—Mixing; Kneading
  • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
  • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
  • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B7/00—Mixing; Kneading
  • B29B7/80—Component parts, details or accessories; Auxiliary operations
  • B29B7/88—Adding charges, i.e. additives
  • B29B7/90—Fillers or reinforcements, e.g. fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
  • B29B7/00—Mixing; Kneading
  • B29B7/80—Component parts, details or accessories; Auxiliary operations
  • B29B7/88—Adding charges, i.e. additives
  • B29B7/94—Liquid charges
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
  • B29C48/38—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
  • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
  • B29C48/404—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having non-intermeshing parts
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
  • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/25—Component parts, details or accessories; Auxiliary operations
  • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
  • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
• • 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
  • B29K2021/00—Use of unspecified rubbers as moulding material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2321/00—Characterised by the use of unspecified rubbers

Definitions

• This invention relates to a process for the continuous production of a composition comprising rubber, hydrocarbon resin and solvent, in particular an adhesive formulation.
• the object of this invention is that of providing an improved process of the abovementioned type, in particular having marked versatility and which can be implemented through machinery of limited size.
• This object is achieved through a production process of the type indicated above, which is implemented through the use of two or more two-screw extruders placed in series.
• extruders placed in series allows very much greater flexibility in installation than in the case where a single extruder is used.
• the latter must in fact necessarily be of a very great length and is therefore not easily fitted into small spaces, apart from being intrinsically complex to make from the construction point of view.
• the use of separate extruders makes it possible to select the corresponding process parameters, such as temperature and rate of rotation of the screws and the like, independently and freely, so that the extrusion process can be adapted to specific operating requirements with great versatility.
• the temperature at the outlet of each extruder is less than the boiling point of the solvent in which the other ingredients are dissolved.
• the two-screw extruders which can be used are of a conventional type, advantageously of the co-rotating type. Two-screw extruders of the contrarotating type may however be used.
• the extruders used have a ratio between the outside and inside diameters of the screws which preferably lies between 1.4 and 2.0 and even more preferably between 1.55 and 1.8, in order that their outer dimensions can be substantially reduced.
• the process according to the invention preferably provides for the addition of solvent in a fractionated way at a plurality of points downstream from the initial, section of the first extruder and at a plurality of points located along the second extruder. Again preferably, a fraction of solvent is added to the composition leaving the first extruder before it enters the second extrude .
• the rubber and the resin are all added to the initial section of the first extruder.
• the rubber used may be selected from the group comprising natural rubbers, synthetic rubbers and their mixtures, for example styrene- ⁇ soprene-styrene (SIS), styrene-butadiene- styrene (SBS) and "natural rubber” (NR) .
• SIS styrene- ⁇ soprene-styrene
• SBS styrene-butadiene- styrene
• NR natural rubber
• hydrocarbon resin is a resin prepared through the polymerisation of unsaturated constituents of coal tar, rosin or petroleum.
• hydrocarbon resins having adhesion-impart ng properties for example of the type marketed by the name of Escorez or Wing-tack and their mixtures, are used.
• the solvent is for example selected from the group comprising pentane, hexane, heptane, dichloropropane and their mixtures.
• Figure 1 diagrammatically illustrates two two-screw extruders placed in series, in which a process according to the invention is carried out
• Figures 2, 3 and 4 diagrammatically illustrate corresponding pairs of two-screw extruders placed in series, in which corresponding further embodiments of the process according to the invention are carried out .
• a process for the continuous production of a composition comprising rubber, hydrocarbon resin and solvent provides for the use (Figure 1) of a first two-screw extruder 10a and a second one 10b, for example of the co-rotating type, placed in series.
• first extruder 10a there is a first length 12, a second length 14, a third length 16, a fourth length 18 and a fifth length 19 in succession.
• First length 12 is approximately 16 D long (whereby D is meant the diameter of one of the two screws of extruder 10a)
• second length 14 is approximately 12 D long
• third length 16 is approximately 12 D long
• fourth length 18 is approximately 8 D long
• fifth length 19 is approximately 20 D long.
• Rubber 20 a fraction of hydrocarbon resin 22, and conventional addit ⁇ ves 24, for example antioxidising agents, are added at the start of first length 12.
• the ingredients added are homogenised in first length 12.
• the remaining fraction of resin 22 is added at the end of first length 12, while a first fraction of solvent 26 is added in second length 14.
• the remaining ingredients are dissolved in solvent 26 in second length 14.
• the temperature when the composition obtained leaves first extruder 10a must necessarily be lower than the boiling point of solvent 26 at trie process pressure.
• a further fraction of solvent 26 is then added to the composition leaving first extruder 10a, before it is placed in second extruder 10b.
• the overall fraction of solvent placed in first extruder 10a or added to the composition leaving it comprises between 50 and 80% of the total. The remaining fraction is added in second extruder 10b.
• first length 28 is approximately IS D long (whereby D is meant the diameter of one of the two screws of extruder 10)
• second length 30 is approximately 12 D long
• third length 32 is approximately 12 D long.
• first and second lengths 28, 30 Further fractions of solvent 26 are added to first and second lengths 28, 30 respectively. Further dissolution of the remaining ingredients in solvent 26 takes place in lengths 28, 30, 32.
• the temperature of the composition obtained at the outlet from second extruder 10b must necessarily be less than the boiling point of solvent 26 at the process pressure.
• the temperature of the composition within second extruder 10b is less than the temperature of the composition within first extruder 10a.
• the rotation speed of the screws of first extruder 10a lies for example between 20 and 300 rpm, while the rotation speed of the screws of second extruder 10b lies for example between 60 and 600 rpm. These rotation speeds may be adjusted independently of each other, so that the viscosity of the final composition can be controlled in the desired way.
• the rotation speed of the screws of second extruder 10b is greater than that of the screws of first extruder 10a.
• a first change in comparison with the preceding instance lies in the fact that solvent 26 is not added in second length 30 of second extruder 10b.
• a second change in comparison with the preceding instance lies in the fact that masterbatch 34 (comprising a concentrated mixture of dye in the resin) is added at the points where resin 22 is added.
• first length 12 of first extruder 10a is 28 D long, equivalent to tie sum of the lengths of the first and second lengths of the first extruder in Figure 3.
• the whole quantity of resin 22 is added to the initial section of first length 12, after which the first addition of solvent 26 is instead made.
• the structure of the remaining parts of first extruder 10a and all of second extruder 10b, and the ways of adding the remaining fractions of solvent 26 remain unchanged * , in comparison with what has been described with reference to Figure 3.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Medicinal Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Processes Of Treating Macromolecular Substances (AREA)
• Nonmetallic Welding Materials (AREA)
• Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Citations (6)

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• 2003
  • 2003-10-01 IT IT000764A patent/ITTO20030764A1/it unknown
• 2004
  • 2004-09-29 RU RU2006114351/04A patent/RU2372359C2/ru not_active IP Right Cessation
  • 2004-09-29 CN CN200480028611A patent/CN100594107C/zh not_active Expired - Fee Related
  • 2004-09-29 AT AT04765678T patent/ATE555885T1/de active
  • 2004-09-29 WO PCT/EP2004/010874 patent/WO2005030457A1/en not_active Ceased
  • 2004-09-29 BR BRPI0415153-4A patent/BRPI0415153B1/pt not_active IP Right Cessation
  • 2004-09-29 JP JP2006530038A patent/JP5037942B2/ja not_active Expired - Fee Related
  • 2004-09-29 EP EP04765678A patent/EP1670626B1/en not_active Expired - Lifetime
  • 2004-09-29 US US10/574,481 patent/US7641832B2/en not_active Expired - Fee Related

Patent Citations (6)

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