Classifications

• • 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
  • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
  • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
  • B29C48/83—Heating or cooling the cylinders
  • B29C48/834—Cooling
• • 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
  • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
  • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
  • B29C48/83—Heating or cooling the cylinders
• • 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
  • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
  • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
  • B29C48/83—Heating or cooling the cylinders
  • B29C48/832—Heating
• • 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
  • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
  • B29C48/875—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling for achieving a non-uniform temperature distribution, e.g. using barrels having both cooling and heating zones
• • 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

Definitions

• the present invention relates to a heating and cooling arrangement for an extrusion cylinder and an extrusion cylinder with at least one heating and cooling arrangement.
• plastic extrusion machines it is important for the extrusion process that the entire extrusion cylinder can be heated or cooled.
• This arrangement has the disadvantage that it has a high degree of inertia with respect to heating and cooling and does not allow individual heating and cooling of a cylinder section.
• the arrangement according to the invention allows the temperature profile to be adapted to the respective process speed.
• a dynamic heating and cooling system is created, which is also suitable for very fast extrusion processes.
• 1 is a schematic representation of an extruder with heating and cooling elements provided thereon
• FIG. 3 shows a section through a heating and cooling arrangement provided on the extrusion cylinder
• FIG. 4 shows a perspective view of a heating and cooling arrangement mounted on the extrusion cylinder
• Fig. 5 is a view of the extrusion cylinder with cooling elements arranged on its entire circumference and a heating element.
• the extrusion cylinder 1 is shown schematically with a funnel 2.
• Heating and cooling arrangements 3 and 4 are provided on the circumference of the extrusion cylinder 1 at regular, preferably small, intervals.
• a cooling element 4 is shown in section and in plan view.
• the cooling element 4 is made from one piece, the ends as legs 6 and 7 being bent at right angles to the central part 8 and being rotated 45 ° in the direction of their longitudinal axis for mechanical stabilization.
• the cooling element 4 has a curved section 11 and 12, respectively.
• the cooling element is preferably made of copper, a metal with good thermal conductivity.
• the cooling element also has a low heat storage capacity, which is important in the case of rapid successive heating and cooling processes of the extrusion cylinder.
• the heating element is a good heat insulator and has a small heat storage capacity.
• the cooling elements 4 consisting of copper strips angled at their ends, are held on the surface of the extrusion cylinder 1 by two copper wires 13 and 14.
• the copper wires 13 and 14 are guided through the curved sections 11 and 12 formed in the end regions 9 and 10 of the central part 8 of the cooling element.
• All cooling elements 4 arranged over the entire circumference of a section 5 of the extrusion cylinder are fastened by the copper wires 13 and 14.
• the heating element 3 placed over the individual cooling elements 4 is designed in the form of a band. It comprises two outer sheets 15 and 16, between which an insulating material 17 is provided. Heating wires 18 are arranged within the high-temperature-resistant insulating material 17.
• the heating element 3 can be attached to the extrusion cylinder 1 with screws, which also makes it easy to replace it, since the heating element is subject to greater wear than the cooling elements.
• the heating element is designed and mounted on the extrusion cylinder so that as little flow loss as possible occurs during cooling.
• 5 shows a view of the extrusion cylinder 1 with cooling elements 4 arranged over the entire circumference thereof, forming a band, and the band-shaped heating element 3.
• Two connecting wires 19 and 20 for the heating element 3 are guided outwards from the surface of the extrusion cylinder 1.
• the cooling air is blown radially onto the extrusion cylinder and flows axially away.
• the number of cooling and / or heating zones can be varied as required. By arranging individual, identical cooling elements, the arrangement can be adapted to any diameter of the extrusion cylinder.
• Each heating and cooling arrangement formed from a number of cooling elements and a heating element ensures that a predetermined temperature is maintained at the point where it is attached around the cylinder. Both the cooling elements and the heating elements have a low heat storage value.
• the heating elements which act as heat insulators on the outside, lie over the copper strip of the cooling elements and thus cause the heat to penetrate directly into the cylinder as a result of the direct contact between the heating elements, the copper strip and the cylinder. If cooling is to be effected, the corresponding heating element is switched off. The heat of the cylinder is then released through the legs 6 and 7 of the cooling elements by radiation and convection to the outside air.
• an axially acting fan is set up at the end of the cylinder, which ensures air circulation.

Landscapes

• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4281741

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (5)

Citations (10)

Family Cites Families (7)

• 1986
  • 1986-11-05 US US07/075,916 patent/US4921355A/en not_active Expired - Lifetime
  • 1986-11-05 WO PCT/CH1986/000154 patent/WO1987002617A1/de active IP Right Grant
  • 1986-11-05 JP JP61505684A patent/JPS62502330A/ja active Granted
  • 1986-11-05 EP EP86906256A patent/EP0246250B1/de not_active Expired - Lifetime
  • 1986-11-05 DE DE8686906256T patent/DE3675938D1/de not_active Expired - Fee Related

Patent Citations (10)

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