EP4225548A1 - Procédé de recyclage de plateaux et de blisters - Google Patents

Procédé de recyclage de plateaux et de blisters

Info

Publication number
EP4225548A1
EP4225548A1 EP21787439.5A EP21787439A EP4225548A1 EP 4225548 A1 EP4225548 A1 EP 4225548A1 EP 21787439 A EP21787439 A EP 21787439A EP 4225548 A1 EP4225548 A1 EP 4225548A1
Authority
EP
European Patent Office
Prior art keywords
flakes
washing step
washing
sorting
pet
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP21787439.5A
Other languages
German (de)
English (en)
Inventor
Michael Heyde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alpla Werke Alwin Lehner GmbH and Co KG
Original Assignee
Alpla Werke Alwin Lehner GmbH and Co KG
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 Alpla Werke Alwin Lehner GmbH and Co KG filed Critical Alpla Werke Alwin Lehner GmbH and Co KG
Publication of EP4225548A1 publication Critical patent/EP4225548A1/fr
Pending legal-status Critical Current

Links

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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • 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
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/66—Recycling the material
    • 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
    • B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
    • B29B7/842—Removing liquids in liquid form
    • 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
    • B29B7/885—Adding charges, i.e. additives with means for treating, e.g. milling, the charges
    • 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
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules
    • B29B2009/165—Crystallizing granules
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B2017/001—Pretreating the materials before recovery
    • B29B2017/0015—Washing, rinsing
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0203—Separating plastics from plastics
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0286—Cleaning means used for separation
    • B29B2017/0289—Washing the materials in liquids
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0293—Dissolving the materials in gases or liquids
    • B29B2017/0296—Dissolving the materials in aqueous alkaline solutions, e.g. NaOH or KOH
    • 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
    • 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
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules
    • 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
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • 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
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the invention relates to a method for recycling PET trays and blisters according to the preamble of claim 1.
  • PET bottles The recycling of PET bottles is state of the art and many PET bottles on the market already have a significant proportion of PET recycling goods of up to 100%.
  • PET trays and PET blister packaging use PET recycling goods from the bottle sector and also contain up to 100% recycling goods, but not in the sense of a closed cycle, since the recycling quantities come from the bottle market and are withdrawn from it.
  • both markets are affected by the fact that the legally prescribed recycling targets are not achieved, since the rPET quantities from the bottle area are not sufficient. Therefore, both markets, bottles and bowls, have to be recycled in order to be able to meet the legal requirements.
  • PET trays and blister packs themselves are not fed into a self-contained recycling process is on the one hand due to the structure of the tray and blister packs.
  • many blister packs are multi-layered.
  • PET with an LDPE sealing layer, PET with an EVOH or polyamide barrier layer are common.
  • the reason lies in the non-optimal washing, sorting and recycling processes.
  • EP 1 084 171 A1 discloses a process for recycling polyesters which leads to a recycled polyester of sufficient purity to meet the requirements or standards of food packaging.
  • the collected polyester bottles are crushed into flakes.
  • the flakes are washed and dried.
  • the melt is mixed with a melt of virgin polyester and extruded into pellets.
  • the «post-consumer» melt can also first be extruded into pellets and then mixed with «virgin polyester» pellets. Finally, a polymerization takes place by SSP.
  • Another task is to define a washing process that allows current polymer sorting systems to remove foreign polymers from flakes from the stream of washed trays and the blister stream and thus to feed this packaging stream into high-quality recycling.
  • washing step (c) is a gentle washing step with low particle friction and a low temperature below 62° C. in a basic medium, or it is a gentle washing step with low particle friction and a low temperature in an acidic medium is below 85°C and that in the flake sorting (f) the flakes gently washed in the first washing step (c) are sorted. Due to the gentle first washing step (c), the flakes have a size of more than 2 mm after washing and can be sorted with conventional sorting devices after washing. The formation of flakes smaller than 2mm or so-called fines, which can no longer be sorted, is prevented by the gentle first washing step.
  • the first washing step (c) is carried out below 85°C, in an acid with a pH of 1 to 3 and a preferred washing time of 60 to 600 min. Even under these washing conditions, no flakes with an undesired size of less than 2 mm are formed during the first washing step (c).
  • a second intensive washing step (i) is carried out at a temperature between 70 and 90° C., with increased particle friction and in a basic medium. If intensive cleaning of the flakes is necessary, for example if food is packed in the shells and blisters made from the flakes or if transparent shells or blisters are made from the pellets, flakes with a size of less than 2 mm may be used in this second washing step develop. These small flakes no longer disturb the sorting because the sorting was carried out before the second intensive washing step. In the further processing of the flakes after the second washing step (i), the size of the flakes is irrelevant for the quality of the rPET. Flake sorting (f) therefore does not take place directly before extrusion (g), as is customary in the prior art, but is placed in the middle of the washing process.
  • a pre-wash (j) of the articles is provided.
  • the pre-washing of the trays and blisters enables the flakes to be adequately cleaned despite the gentle first washing step.
  • the solid-phase polycondensation (h) is carried out before the extrusion (g).
  • the first washing step (c) is expediently carried out at a preferred alkali concentration of 1.2 to 2.5% by weight and a preferred washing time of 5 to 50 minutes. These washing conditions do not result in any undesirable reduction in the size of the flakes to below 2 mm.
  • the invention is also preferably characterized in that the process avoids fast-running agitators and so-called mechanical dryers, which place a heavy mechanical load on the material, and are replaced by slow-running agitators in the wash and by centrifuges and air currents in the dewatering/drying , so that the mechanical energy, measured by the electrical consumption of the electric motors, is less than 10 Wh/kg PET regrind.
  • the particle friction which can lead to undesired comminution of the flakes, is reduced as much as possible.
  • drying step (e) is thermal drying by means of air currents. This type of drying is particularly gentle, which means that the flakes do not run the risk of being crushed during drying.
  • the flakes have a water content of less than 5% after the drying step (e). This allows the flakes to be sorted more precisely, since the water cannot falsify the sorting.
  • the smallest extent of the flakes is greater than 2 mm and the extent of the flakes is between 4 and 18 mm and preferably between 5 and 15 mm.
  • the method is surprisingly suitable for producing rPET pellets from shells and blisters, which have been freed from foreign substances and coatings by sorting. Sorting can be carried out particularly precisely in the above preferred range of flake size.
  • Solid-phase polycondensation can be performed after extrusion to build up the rPET.
  • the SSP step can be performed on extruded staple fibers or an extruded film.
  • the condensation by removing water takes place on the extruded product preferably at a temperature between 185.degree. C. and 245.degree.
  • Figure 1 a block diagram of a process for recycling PET
  • FIG. 2 a block diagram of a basic process for recycling PET
  • FIG. 2a a first variant of the method as shown in the block diagram from FIG. 2;
  • Figure 2b a second variant of the method as shown in the block diagram from Figure 2 and
  • Figure 2c a third variant of the method as shown in the block diagram from Figure 2.
  • FIG. 1 shows a block diagram of a method for recycling PET bottles. The procedure includes the following steps:
  • washing step (c) is a multi-stage intensive hot wash with lye and detergents. After the SSP, the rPET pellets produced by extrusion (g) can be processed back into bottles.
  • the invention relates to PET trays and blister packs which are collectively referred to as articles.
  • articles and flakes made from them have surprisingly shown that these behave differently from bottles and flakes made from bottles in a caustic bath.
  • the process management must therefore be adapted to these recycled goods so that the recycled goods are of sufficient quality for reuse.
  • PET bottle goods are partially crystalline (stretched) in the thin-walled areas and amorphous (unstretched) in the thick-walled areas.
  • the tray and blister goods for the recycling process differ significantly here. There are very many amorphous thin-walled areas and very few partially crystalline (stretched areas). The crystallinity is also much lower in these semi-crystalline areas.
  • Amorphous PET is significantly more brittle than partially crystalline PET, the thinner the PET flake is, the more likely it is that loads will break it.
  • this tendency to break is increased by a second property of the polyester: partially crystalline PET from bottle applications is only slightly attacked by alkalis, since the crystallinity suppresses the tendency to stress cracks.
  • amorphous PET which is increasingly found in tray and blister packs, is very sensitive to alkalis and tends to develop stress cracks. The surface of the recycled shells damaged by the lye is therefore much more prone to breakage and consequently to dust formation.
  • the washing process is a first gentle washing step (c), in which there are no "fines” that can no longer be sorted.
  • the first washing step (c) is preferably carried out at an alkali concentration of 1.2 to 2.5% by weight and a washing time of 5 to 50 minutes. Due to the first gentle washing step, individual flakes remain in the size of 2 to 20 mm and ideally in the size between 4 to 18 mm and do not break when bent by 90° around a radius of 1 mm.
  • the sorting of the flakes is preferably between the dewatering of the flakes (d) and the drying of the flakes (e). The flakes can also be dried during dewatering.
  • the first washing step can be carried out below 85°C with an acid with a pH of 1 to 3, with a duration of 60 to 600 min.
  • individual flakes remain with a size of 2 to 20 mm and ideally between 4 and 18 mm and do not break when bent through 90° around a radius of 1 mm.
  • the flakes are sorted in the flake sorting (f) immediately after the first washing step (c) and the drying (e) of the flakes. Further process steps are only carried out after the flake sorting (f). This ensures that the flakes are of a sufficient size and, as a result, foreign bodies can be reliably separated from the flakes by conventional sorting devices.
  • Agitators are usually used in and after the washing step (c), in particular during the neutralization and the drying step (e).
  • the articles or the flakes are not mechanically stressed by agitators, but treated gently by appropriate mechanical dewatering devices and air currents, without the flakes being crushed in an undesired manner.
  • Agitators are only used in the washing and neutralization process, so that the mechanical energy, measured by the electrical consumption of the electric motors, is less than 10 Wh/kg PET regrind.
  • the flakeware is more than 90% dry (water content below 5%) in a flake form that is over 2mm in its largest dimension.
  • the drying of the flakes (e) is preferably gentle thermal drying.
  • the drying of the flakes (e) can be omitted, when the flakes are sufficiently dry.
  • the rolled out maximum dimension does not apply, but rather the actual deformed maximum dimension. Flake sizes between 4 and 18mm are necessary for optimal sorting and are not undercut by the present first washing step and gentle drying.
  • a polymer sorter which recognizes and sorts out multilayer structures of PET with polyolefins, in particular LDPE, polyamides, in particular MXD6 and other barrier layers such as EVOH and PGA, by means of infrared and near infrared reflection and transmission.
  • a color sorter can also be used which, in particular, separates yellowed PET using oxygen scavengers.
  • a second hot washing step (i) at 70 to 90°C with intensive friction after flake sorting (f) can be added to the process ( Figure 2c). This can be necessary, for example, when the regenerated goods are shaped into trays and blisters in which foodstuffs are packaged, since high hygienic requirements are then placed on the packaging.
  • the first washing step (c) is so gentle due to the low temperature and friction that optimal sorting is possible.
  • the second washing step (i) can be carried out hot and with intensive friction without restrictions for optimal flake sorting (f) (FIG. 2c). If the flakes break up and fines are formed in this second washing step (i) and can therefore no longer be sorted, this is not a problem as no further sorting is necessary.
  • These flakes can be processed again directly or after further drying of the flakes (e) into PET trays or blisters in an extrusion (g) with degassing.
  • flakes can also already be condensed on by a solid-phase polycondensation (SSP) (h) before the extrusion (g), as an alternative or in addition to the drying (e).
  • SSP solid-phase polycondensation
  • This alternative SSP (h) can be made directly from the flakes or from crushed flakes (powder SSP). This alternative embodiment is shown in Figures 2, 2b and 2c.
  • the blisters and/or trays can be prewashed (j) before the comminution (b).

Abstract

L'invention concerne un procédé de recyclage de plateaux et de blisters en PET, appelés articles, comprenant les étapes de procédé suivantes, consistant à : (A) prétrier les articles, (b) broyer les articles pour former des copeaux, (c) laver les articles dans une première étape de lavage, (d) déshydrater les copeaux, (e) sécher les copeaux, (f) trier les copeaux, (g) extruder et (h) polycondenser à l'état solide (SSP). La première étape de lavage (c) est une étape de lavage douce présentant un frottement réduit des particules et une basse température inférieure à 62°C. Pendant le tri des copeaux, (f), les copeaux, qui ont été lavés de manière douce dans la première étape de lavage (c), sont triés.
EP21787439.5A 2020-10-06 2021-10-06 Procédé de recyclage de plateaux et de blisters Pending EP4225548A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01270/20A CH717934A1 (de) 2020-10-06 2020-10-06 Verfahren zum Recyclen von Schalen und Blistern aus PET.
PCT/EP2021/077599 WO2022074065A1 (fr) 2020-10-06 2021-10-06 Procédé de recyclage de plateaux et de blisters

Publications (1)

Publication Number Publication Date
EP4225548A1 true EP4225548A1 (fr) 2023-08-16

Family

ID=73597725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21787439.5A Pending EP4225548A1 (fr) 2020-10-06 2021-10-06 Procédé de recyclage de plateaux et de blisters

Country Status (7)

Country Link
US (1) US20230398718A1 (fr)
EP (1) EP4225548A1 (fr)
CN (1) CN116419835A (fr)
BR (1) BR112023006228A2 (fr)
CH (1) CH717934A1 (fr)
MX (1) MX2023003999A (fr)
WO (1) WO2022074065A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH719619A1 (de) * 2022-04-22 2023-10-31 Alpla Werke Alwin Lehner Gmbh & Co Kg Verfahren zum Recycling von Polyester-Behältern.

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Publication number Priority date Publication date Assignee Title
US5876644A (en) * 1996-08-27 1999-03-02 Wellman, Inc. Food quality polyester recycling
DE69727650T2 (de) * 1996-12-31 2004-07-29 M&G Polimeri Italia S.P.A., Patrica Verfahren zur Rückgewinnung von festem mikroporösem Polyester aus einem Recyclingstrom und Produkte daraus
DE19953659A1 (de) * 1999-11-08 2001-05-10 Buehler Ag Verfahren und Vorrichtung zur Dekontamination von Polykondensaten
DE102010019824A1 (de) * 2010-05-08 2011-11-10 Arnulf Lorenz Verfahren und Anlage zur Rückgewinnung von Kunststoff-Recyclaten aus zerkleinerten Kunststoffen
DE102013000592B4 (de) * 2013-01-16 2022-10-13 Cvp Clean Value Plastics Gmbh Verfahren zum Entfernen von Verunreinigungen auf Kunststoffschnipseln
US10196496B2 (en) * 2013-03-31 2019-02-05 Pranay Jain Process for recycling a metalized polyester film

Also Published As

Publication number Publication date
CN116419835A (zh) 2023-07-11
CH717934A1 (de) 2022-04-14
WO2022074065A1 (fr) 2022-04-14
US20230398718A1 (en) 2023-12-14
MX2023003999A (es) 2023-05-19
BR112023006228A2 (pt) 2023-05-09

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