WO2004080691A9 - Systeme de traitement de particules rebroyees de polyethylene terephthalate - Google Patents

Systeme de traitement de particules rebroyees de polyethylene terephthalate

Info

Publication number
WO2004080691A9
WO2004080691A9 PCT/US2004/006815 US2004006815W WO2004080691A9 WO 2004080691 A9 WO2004080691 A9 WO 2004080691A9 US 2004006815 W US2004006815 W US 2004006815W WO 2004080691 A9 WO2004080691 A9 WO 2004080691A9
Authority
WO
WIPO (PCT)
Prior art keywords
polyethylene terephthalate
virgin
regrind
granules
dried
Prior art date
Application number
PCT/US2004/006815
Other languages
English (en)
Other versions
WO2004080691A1 (fr
Inventor
Robert Crawford
Original Assignee
Mann & Hummel Protec Gmbh
Robert Crawford
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mann & Hummel Protec Gmbh, Robert Crawford filed Critical Mann & Hummel Protec Gmbh
Publication of WO2004080691A1 publication Critical patent/WO2004080691A1/fr
Publication of WO2004080691A9 publication Critical patent/WO2004080691A9/fr

Links

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
    • B29C48/793—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling upstream of the plasticising zone, e.g. heating in the hopper
    • B29C48/797—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
    • B29C48/03—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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of 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
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/287—Raw material pre-treatment while feeding
    • 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
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • 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
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/256—Sheets, plates, blanks or films
    • 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
    • B29K2105/26—Scrap or recycled material

Definitions

  • PET polyethylene terephthalate
  • PET is a hygroscopic material which absorbs moisture from the atmosphere. While low amounts of absorbed moisture can be tolerated in molding and extruding processes, excessive moisture levels tend to result in defects in the produced articles. Consequently, it is a conventional practice to heat PET regrind to elevated temperatures to drive off moisture before returning it to the molding or extruding line.
  • PET can exist in either an amorphous or a crystalline state, and most PET regrind consists of amorphous material.
  • amorphous PET When amorphous PET is heated to high drying temperatures, it can become tacky and tends to agglomerate. This, in turn, can lead to severe fouling or blockages in production equipment.
  • Another object of the present invention is to provide an improved method of processing PET regrind material. Another object of the invention is to provide a method of processing PET regrind material which reduces the overall energy consumption of the process.
  • a further object of the invention is to provide a method for processing PET regrind material which is flexible in its operation.
  • An additional object of the invention is to provide an improved method for processing PET regrind material which can effect rapid changes in the material which is processed by extrusion or the like.
  • PET regrind which avoids the need for a crystallization stage.
  • a still further object of the invention is to provide a method of processing PET regrind which minimizes exposure of the material to potentially damaging temperatures.
  • Another object of the invention is to provide a method of processing PET regrind in which operator control is simplified.
  • Still another object of the invention is to provide a method of processing PET regrind which minimizes the amount of PET resin which is heated at any given time.
  • a method of producing a polyethylene terephthalate sheet comprising the steps of (a) drying virgin polyethylene terephthalate granules with a stream of dry air at an elevated temperature above the polyethylene terephthalate glass transition temperature; (b) cooling the dried virgin polyethylene terephthalate granules with a stream of air to a temperature below the polyethylene terephthalate glass transition temperature; (c) transporting the cooled virgin polyethylene terephthalate granules to an extruder; (d) drying polyethylene terephthalate regrind material with a stream of dry air at a temperature below the polyethylene terephthalate glass transition temperature; (e) transporting dried polyethylene terephthalate regrind material to the extruder; (f) blending dried and cooled virgin polyethylene terephthalate granules with dried polyethylene terephthalate regrind material; and (g) extruding the blended virgin polyethylene
  • an apparatus for processing polyethylene terephthalate regrind particles comprising (a) a virgin polyethylene terephthalate granule dryer; (b) means for supplying said virgin granule dryer with dry heated air at a temperature above the polyethylene terephthalate glass transition temperature to dry polyethylene terephthalate granules therein; (c) a polyethylene terephthalate granule cooler for receiving dry polyethylene terephthalate granules from said virgin granule dryer; (d) means for supplying dry cooling air to said granule cooler for cooling dried polyethylene terephthalate granules to a temperature below the polyethylene terephthalate glass transition temperature; (e) a polyethylene terephthalate regrind particle dryer; (f) means for supplying said regrind particle dryer with dry air at a temperature below the polyethylene terephthalate glass transition temperature to dry polyethylene terephthalate regrind particles therein
  • the invention reduces equipment requirements while gaining maximum processing advantage and improved energy savings via low-temperature drying of PET regrind particles.
  • On-the-fly recovery of regrind into cooled process stream eliminates large batch blending requirements. By handling materials in this fashion, the following benefits are experienced:
  • Blending is simplified by "cutting in” regrind on demand; * Lower energy consumption is achieved;
  • the usual technique for processing PET is heating by the crystallizer/dryer and then melting by the screw agitation.
  • the bulk of the melt energy is developed by the extruder. Energy savings are achieved because the additional load of extruder energy is less than net load of crystallizing and drying circuits.
  • the drying system cooling load (because the air to be dehumidified must be cooled for desiccant efficiency) is decreased since material enters the drying system at ambient temperatures instead of hot from crystallizer. Regrind drying temperatures are low and not time critical.
  • PET regrind material can be dried at temperatures as high as 325°F to 35O 0 F.
  • the PET regrind particles are dried at a low temperature of only 150°F to 160°F.
  • the dried PET regrind material enters the system after high-temp virgin granule drying. Therefore, the regrind material is never subjected to temperatures above the glass transition temperature, and no crystallizer is required to prevent undesired tackiness and agglomeration.
  • the virgin granules are dried at temperatures of 325°F to 35O 0 F for about 3 to about 4 hours to a moisture content of 50 ppm or less.
  • the dried virgin granules are then cooled before blending with the PET regrind particles which are dried at low temperature.
  • the virgin granule cooling hopper is located in a gravity particle flow, serial airflow arrangement to recover heat from cooling hopper exhaust.
  • the optimized airflow achieved by the invention maximizes energy, and eliminates or virtually eliminates operator temperature adjustments.
  • the drying air volume may be regulated based on the outlet air temperature when the inlet temperature of the drying air is fixed. A system of this type is described in Graeff, US Patent No. 4,413,426.
  • the method and apparatus of the invention also promote efficiency by making it possible for multiple lines to share a single source of dried and cooled virgin PET granules. Damage to the regrind material is avoided due to the mild conditions to which the PET regrind particles are subjected in the invention. In general, they are dried at a temperature in the range from 150° to 16O 0 F for a period of 4 to 6 hours to a moisture content of 200 ppm or less. Due to drying below the polyethylene terephthalate glass transition temperature, no crystallizer is required. The dried PET regrind material can be "cut-in" as needed to the cooled virgin PET granule stream supplied to the extruders.
  • a preferred system begins with a regrind feed system either from silo or gaylord dumpers to feed a 6 hour or larger drying hopper.
  • a regrind feed system either from silo or gaylord dumpers to feed a 6 hour or larger drying hopper.
  • Each standard color that will be used at the same time in the plant will require a separate drying vessel.
  • a single virgin granule drying system can be used to process all virgin resin requirements for the facility. This reduces the need to have individual dryers for each extruder, and with different colors fully prepared before they are needed at the extruder, they can be immediately loaded to a different line when a color change is required. In those cases where an individual regrind drying system is not running at its design rate, it can still produce dry material that will not have sufficient exposure to temperature to degrade the resin.
  • the dry resins must be transported in a sealed pneumatic conveying system to assure delivery of properly dried resin that is not exposed to ambient air that would rewet the resin.
  • a closed loop low pressure, dilute phase pneumatic conveyor is preferably used.
  • This type of conveying system utilizes fill/pass valves that enable a single delivery system to serve several lines. It is preferred to use airlocks on the virgin and regrind drying vessels that will regulate the amount of resin to be charged into the conveying line.
  • the first material introduction point is at the virgin drying hopper where the airlock will feed in a metered quantity material, and then proceed in the same pipe to the appropriate regrind hopper where its airlock will meter in the desired quantity of regrind particles.
  • the resulting blended mixture will then be conveyed to the selected extruder feed hopper where the fill/pass valve is actuated to drop the conveyed resin into the hopper.
  • the convey system piping is run in a loop through the plant with a fill/pass valve located in each pipe where a particular material may be utilized. This assures the delivery of the correct mixture to each line where the selected material will be used.
  • the conveying system control regulates the metering airlocks, blower units, and system valving.
  • the operator will only need to verify that the selected regrind drying hopper is available, and he will then assign the required blend ratio to extruder feed hopper.
  • the selection of the material is maintained at a very simple level for the operator by use of the method and apparatus of the invention.
  • Figure 1 is a schematic illustration of a system for processing PET regrind according to the present invention
  • FIG. 2 is a diagram of an alternate arrangement for processing PET regrind in accordance with the present invention in which different colors of PET regrind material can be selectively supplied to an extruding line;
  • Figure 3 is a drawing of a preferred vertical arrangement of a PET regrind drying vessel with vessels for drying and cooling virgin PET.
  • FIG. 1 is a schematic diagram of an installation 10 for extruding PET into sheets.
  • Virgin PET granules from a source (not shown) are introduced through a line 12 into a vacuum feeder 14.
  • the vacuum feeder 14 discharges through a gate valve into a drying hopper 16 a stream of dry air, preheated to approximately 300°F as described hereinafter, is filtered in a filter 18 and then further heated to approximately 350°F in a process heater 20, after which it is introduced at the base of drying hopper 16.
  • the heated dry air passes upwardly through the downflowing virgin PET granules and extracts the moisture from the granules.
  • the moisture level in the granules is reduced to approximately 50 ppm.
  • the air loses heat as it passes upwardly through the PET granules in the drying hopper and is discharged at the top of the drying hopper through a line 22 to a cyclone filter 24, from whence it passes through a line 26 to a desiccant dryer 28.
  • the dried PET granules exit drying hopper 16 at the bottom through a rotary airlock valve 30 and pass to a cooling hopper 32.
  • Dried air from desiccant dryer 28 passes through line 34 to the bottom of cooling hopper 32.
  • the dry air as it enters the cooling hopper has a temperature of only about 150°F. It passes upwardly through the hot PET granules received from the drying hopper and extracts heat from the granules so that the granules are cooled. In the course of this passage, the air is preheated to about 300 0 F. The preheated air is then discharged from the top of cooling hopper 32 through line 34 and passes to filter 18.
  • Cooling hopper 32 has a dual rotary airlock valve discharge arrangement with first and second rotary airlock discharge valves 36 and 38, respectively.
  • Valve 36 opens into a sealed pneumatic conveying line 40 supplied with pressurized air from a pump 42.
  • Valve 38 opens into a sealed pneumatic conveying line 44 which is supplied with pressurized air by a pressure pump 46.
  • Lines 40 and 44 lead respectively to first and second extruder feed circuits 48 and 50 from which the dried and cooled PET granules are supplied through selectively operable fill/pass valves 52 to extruders 54 which extrude the PET into sheets.
  • the extruders 54 may be vented extruders. Preferably they are vacuum vented extruders. Equipment of this type is commercially available from Welex Co. of Blue Bell, Pennsylvania, USA. PET regrind material is introduced through lines 56 and 58, respectively into vacuum feeders 60 and 62 at the top of regrind drying hoppers 64 and 66, respectively. Drying air is passed through filters 68 and 70 and desiccant dryers 72 and 74 from whence it is conveyed to the bottom of regrind drying hoppers 64 and 66, respectively. The dry air extracts moisture from the regrind particles and then is discharged from the tops of regrind drying hoppers 64 and 66 through lines 76 and 78 which recirculate the drying air back to the filters 68 and 70, respectively.
  • the drying air temperature in the regrind drying circuits is controlled to a temperature which is less than the glass transition temperature of PET.
  • heating devices 80 and 82 are provided on the drying air recirculation lines to control the temperature. Heating devices 80 and 82 may be gas fired burners, but they also may be heat exchangers which pass the drying air in heat exchange relation with another process stream of appropriate temperature.
  • the dried PET regrind particles are discharged through airlock valves 84 and 86 into the pneumatic conveying lines 40 and 44 of the PET supply circuits 48 and 50. In this way, PET regrind particles are blended with the virgin PET granules supplied to the extruders. By adjusting the relative proportions of virgin granules and regrind particles supplied to the respective supply circuits, admixtures having the desired proportions of regrind material and virgin material may be supplied to the extruders.
  • both extruder supply circuits are supplied with virgin granules from a single dryer and cooler.
  • separate regrind drying hoppers 64 and 66 are provided for each PET supply circuit. In this way, it is possible to supply all circuits with virgin material from a single source, and yet to supply different circuits with different colors of regrind material.
  • FIG. 2 is a schematic diagram of a portion of a modified PET extruding installation. Like parts are identified by the same reference numerals. The arrangement and operation of the virgin PET granule dryer and cooler are identical to that in Figure 1, and for simplicity of illustration are not shown here.
  • FIG. 1 illustrates a preferred apparatus embodiment in which a virgin granule dryer, a virgin granule cooler and a regrind particle dryer are arranged in a vertical column.
  • a supply of virgin PET granules is introduced through line 92 into vacuum chamber 94 and then discharged through a gate valve 96 into drying hopper 98.
  • a stream of dry air at a temperature of approximately 350°F is introduced through line 100 to the bottom of cooling hopper 98 and passes under baffles 102 and thence upwardly through the downwardly flowing PET granules, thereby extracting the moisture from the PET granules.
  • the air loses heat as it passes upwardly through the granules and is discharged from the top of drying hopper 98 through line 104.
  • the dried granules which have also picked up heat from the drying air, are discharged from the bottom of drying hopper 98 through rotary valve 106 to the top of an underlying cooling hopper 108. Dry cooling air is introduced through line 110 to the bottom of cooling hopper 108 and passes under baffles
  • cooling air which has picked up heat from the dried granules, is then discharged through line 114 at the top of cooling hopper 108.
  • the dry cooling air which has been preheated by its passage through the cooling hopper, may be used to ask the drying air supply for the virgin granule drying hopper 98. It is only necessary to pass the preheated cooling air from line 114 through a filter 116 to remove any entrained particles and through a heater 118, to increase its temperature to the requisite drying temperature, and then introduce it through line 100 into the bottom of drying hopper 98. This manner of operation recovers and conserves a large proportion of the heat removed from the dried virgin granules, thereby providing a high degree of energy efficiency.
  • the cooled virgin PET granules are discharged from the bottom of cooling hopper 108 through rotary airlock valve 120 and pass through a discharge line 22 to a sealed pneumatic conveying line 124 which leads to the extruders (not shown).
  • PET regrind material is introduced through line 126 into the top of regrind drying hopper 128.
  • .Dry air from a desiccant dryer (not shown) is introduced through line 130 to the bottom of regrind drying hopper 128.
  • the dry air passes underneath baffles 132 and then upwardly through the PET regrind particles, thereby extracting moisture from the regrind particles.
  • the moisture content of the regrind material is reduced to a level below 200 PPM.
  • the air is then discharged from the top of regrind drying hopper 128 through line 134.
  • Energy efficient operation may be promoted if the drying air discharged from the regrind drying hopper is used as the cooling air introduced to the bottom of the virgin granule cooling hopper. This may be accomplished by first passing the drying air exhausted through line 134 through a suitable dehumidifier 136 and then introducing the dehumidified air through line 110 into the bottom of cooling hopper 138. In this way, the heat content of the regrind drying air may be conserved.
  • the dried regrind particles exit the bottom of regrind drying hopper 128 through rotary airlock valve 138 into the sealed pneumatic conveying line 124 where they are blended with the dried virgin PET granules from line 122.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un procédé et un appareil pour fabriquer une feuille de polyéthylène téréphthalate (PET) dans laquelle les granules PET vierges sont séchés à l'air de séchage (16) à une température supérieure à celle de transition vitreuse du PET. Le matériau PET rebroyé est aussi séché à l'air sec à une température inférieure à celle de transition vitreuse. Des granules PET vierges séchés sont refroidis à l'air dans une trémie de refroidissement (32) jusqu'à une température inférieure à celle de transition vitreuse. Les granules PET vierges refroidis sont mélangés au matériau rebroyé, et le mélange est ensuite extrudé pour former une feuille PET dans des extrudeurs (54).
PCT/US2004/006815 2003-03-06 2004-03-08 Systeme de traitement de particules rebroyees de polyethylene terephthalate WO2004080691A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US45217703P 2003-03-06 2003-03-06
US60/452,177 2003-03-06

Publications (2)

Publication Number Publication Date
WO2004080691A1 WO2004080691A1 (fr) 2004-09-23
WO2004080691A9 true WO2004080691A9 (fr) 2004-12-23

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ID=32990641

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PCT/US2004/006815 WO2004080691A1 (fr) 2003-03-06 2004-03-08 Systeme de traitement de particules rebroyees de polyethylene terephthalate

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WO (1) WO2004080691A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2025494A1 (fr) * 2007-08-10 2009-02-18 Motech GmbH Technology & Systems Procédé et dispositif de fabrication d'une bande d'emballage
DE102010042965A1 (de) 2010-10-26 2012-05-10 Krones Aktiengesellschaft Verfahren zum Herstellen von Kunststoffbehältern und/oder Kunststoffvorformlingen
CN103085189A (zh) * 2012-03-27 2013-05-08 鹰自达装饰材料有限公司 木塑无尘自动供料装置
DE102013000316A1 (de) 2013-01-10 2014-07-10 Brückner Maschinenbau GmbH & Co. KG Vorrichtung zum Entgasen von Polymerschmelzen
RU2668901C1 (ru) * 2017-07-07 2018-10-04 Общество с ограниченной ответственностью "Термочерепица" Технологическая линия по производству многослойной штучной кровельной термочерепицы

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5503790A (en) * 1989-10-05 1996-04-02 Solo Cup Company Method of producing disposable articles utilizing regrind polyethylene terephthalate (PET)
US5807516A (en) * 1995-10-13 1998-09-15 Westaim Technologies Inc. Process of making molecularly oriented polymer profiles

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