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
  • 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
  • B29C43/52—Heating or cooling
• • 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
• • 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
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
• • 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
  • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/34—Heating or cooling presses or parts thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B9/00—Presses specially adapted for particular purposes
  • B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
  • B30B9/3003—Details
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B9/00—Presses specially adapted for particular purposes
  • B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
  • B30B9/3003—Details
  • B30B9/3035—Means for conditioning the material to be pressed, e.g. paper shredding 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
  • 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
  • B29L2031/772—Articles characterised by their shape and not otherwise provided for
  • B29L2031/7722—Block-shaped
• • 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 present invention relates to a process for shaping an elementary block of stable shape and dimensions from a mixture of polymers which are com ⁇ prime and constrained under load in a determined volume of a hydraulic press, including one dead volume is provided with tips heated to a temperature above the softening point of at least one of the aforementioned blend polymers, so as to form a block pierced by said tips.
• a process for reinforcing backfill soils with the aid of a reinforcement structure of raw plastic waste that is re-used in raw form, mixed without any transformation, is disclosed in document EP-A-371898.
• the waste which has a density much lower than that of the soil, is strongly compacted and then ligated to form rectangular blocks of about 1 m3 and a density of 0.3 to 0.6 depending on the intended use.
• the process finds its main application in the construction of light backfill on compressible soils.
• the material is however viscoelastic, sensitive to creep and also highly deformable as soon as the hydraulic stress is released during expansion.
• the present invention aims to overcome the above drawbacks. To this end, it proposes a method, as described in the preamble of claim 1 attached, in which an internal cohesion of the fragments of the polymer mixture is achieved, according to a characteristic of the invention, by piercing the block with the 'using tips brought to a temperature above the softening point of at least one of the polymers of the above mixture.
• the process uses as raw material recovery and / or waste materials, more particularly scrap materials resulting from industrial processes and / or sorted or unsorted residues from the consumer market.
• raw materials are harvested and / or preconditioned according to well-known standards and are sent to an enclosure where they can optionally be brought to a temperature between -40 ° C to + 1000 ° C thus transforming their rheological characteristics.
• These raw materials brought to a suitable temperature according to their final use are sent to one or more weighing, homogenization, preforming, densification and / or precompression chambers.
• pre-transformed materials are introduced into one of the main pressing feed chambers, where they are then compressed under an adjustable pressure between 10 and 2.10 Pa depending on the starting product and the desired end use so as to obtain a density and / or volume perfectly controlled.
• the process includes the introduction into the mass, possibly already formed, of tips brought to a working temperature higher than the softening temperature of at least part of the polymers. These points make it possible to create channels through the mass of the block.
• a variant of the process makes it possible to compress the materials in the final volume while the hot tips are already in place at the desired temperature, which has the effect of creating an agglutination of the thermoplastics during the entire compression operation (low and high pressure ).
• the channels thus formed or being formed can be used for the injection of heat transfer or cryogenic fluids or of any other material to obtain the desired final characteristics.
• the channels have the effect of linking together the different blocks and / or stiffening and / or keep fit.
• the channels formed can serve as anchoring points for the hook (s) of a lifting device or the fork of an elevator in order to facilitate handling and implementation of the blocks. They can also be used to adjust the density.
• the process can use quite diverse materials, possibly mixed and relatively soiled. It does not require prior reformulation of the components by means of additives in order to make them compatible. It allows the use as is of materials which in other processes would be incompatible.
• the process requires little or no cleaning and drying of the raw material. It can use relatively wet materials.
• the tear resistance of the slices of blocks which are sawn to the desired thickness is very high because the layers of material, under the effect of the stress, are oriented in the direction of the force. Creep due to mechanical stress is reduced thanks to the presence of rigid connections which distribute the point stresses over a wide field.
• the initial modulus is weak, expected that the sliding bonds do not block until after a certain level of deformation.
• the process makes it possible to recover very large quantities of mixed plastic waste. By its simplicity, the process constitutes an ecological solution to the costly sorting and recycling problem.
• Virtually all types of essentially flexible and semi-rigid plastics can be compressed and made into blocks.
• the waste is distributed randomly in the compressed block.
• the method may include incorporating into the mass of the block an additional hot-melt material. The process reduces the dispersion of non-degradable plastics in nature.
• the process can accommodate a very large quantity of all flexible or semi-rigid plastics of any collection, sorting or collection, even if these plastics are heterogeneous or soiled, as well as a percentage of less than 15% of fragments of rigid plastic or another material with a melting point below 400 ° C.
• the porosity of the heat-sealed blocks is very low, practically zero.
• the flow of water is only achieved by perforations arranged at the end of compression of the block. From a certain density determined as a function of the thermoplastic materials used, the porosity of the blocks is zero and the flow of water impossible, which makes it possible to maintain an intact water table or a watercourse.
• FIG. 1 is a longitudinal sectional view of a hydraulic press to package provided with heating spikes
• FIG. 2 is a plan view of the press shown in FIG. 1,
• Figure 3 is an end view of the press shown in Figures 1 and 2 and expulsion cylinders.
• FIG. 4 is a partial side elevational view of the side door of the hydraulic press illustrated in Figures 1 to 3 and
• FIG. 5 is an end view of a second upper side door.
• the device intended to form the blocks of compressed plastic material is a horizontal hydraulic press 1 to be packaged.
• a hydraulic unit not shown comprising in a known manner a hydraulic pump and an accumulator of about 200 bar ensures the movement of the piston 4.
• the plastic waste to be compressed, previously flattened, optionally using a continuous helical press, are brought between the plates 2,3 of the hydraulic press.
• These plates 2,3 optionally provided with a heating structure form with the side walls 6 of the press a cage of variable volume in which the material undergoes transverse pleating when it is compressed at a pressure of 1 to 2. 10 Pa. (10 to 20 bar) under a pushing effect of the mobile platform from 125 to 150 t.
• Such a hydraulic press works discontinuously and processes successive loads.
• the use of the hydraulic press 1 is facilitated by the arrangement of an armored side door 7, articulated around the hinges 10, actuated by the jacks 12 and locked by the jacks 13, making it possible to extract the compressed bundle without difficulty.
• This fixed plate of the press can include heating tips 8 passing right through the dead volume of the hydraulic press to be packaged.
• the formation of oblong areas of internal cohesion and compression around the above-mentioned channels makes it possible to bundle the bundle.
• the cavities of hardened material surrounding the channels formed according to the invention, by the heating tips constitute spacers which carry out the internal connection of the block 11.
• a lateral ejector 15 actuated by jacks 16 pushes the block 11 as soon as its rigidity is sufficient after cooling.
• the press according to the invention can also be used to pack metal turnings.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Environmental & Geological Engineering (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Processing Of Solid Wastes (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=3886908

Family Applications (1)

Country Status (5)

Families Citing this family (6)

Family Cites Families (5)

• 1993
  • 1993-03-16 BE BE9300249A patent/BE1008199A5/fr not_active IP Right Cessation
• 1994
  • 1994-03-15 WO PCT/BE1994/000022 patent/WO1994021435A1/fr active Application Filing
  • 1994-03-15 EP EP94908215A patent/EP0689498A1/fr not_active Withdrawn
  • 1994-03-15 JP JP52043594A patent/JPH08507979A/ja active Pending
  • 1994-03-15 US US08/525,579 patent/US5587120A/en not_active Expired - Fee Related

Non-Patent Citations (1)

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