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
  • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
  • B29C67/02—Moulding by agglomerating
  • B29C67/04—Sintering
• • 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
  • B29C43/006—Pressing and sintering powders, granules or fibres
• • 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
  • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
  • B29C43/228—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length using endless belts feeding the material between non-rotating pressure members, e.g. vibrating pressure members
• • 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
  • B29L2007/00—Flat articles, e.g. films or sheets

Definitions

• the invention relates to a method for producing a film web from a synthetic material and to an apparatus for carrying out the method according to the preamble of claim 7.
• thermoplastics are usually produced by extrusion.
• the synthetic material is melted in the form of granules in an extruder and extruded through an extrusion tool.
• insulating, insulating or covering films are increasingly required, in which the properties based on homogeneity and purity are not of primary importance.
• the method according to the invention is based on the fact that the synthetic film material is not formed from an extruded melt, but by melting or melting a microgranulate, which is placed as a dry granule layer on a deposit belt.
• the micro-granules can be fed to a forming device and put into a thin granular layer.
• Subsequent heating and solidification of the granulate layer produces the film web in which the synthetic material, depending on the heating and the solidification, is formed from a completely molten microgranulate or a partially granular and molten microgranulate.
• the laid granulate layer combines to form a continuous and closed film web.
• the depositing belt of the device according to the invention is formed from a heat-resistant material having a fine-pored, air-permeable structure for receiving a microgranulate.
• the process steps for heating and solidifying the microgranules can be carried out immediately after the deposition of the granules.
• the development of the invention particularly advantageous, in which the micro-granules are placed by a blow stream on the air-permeable storage belt.
• the formation device direction a held at a distance from the storage belt forming head, which deposits the micro-granules with a blow stream on the surface of the storage belt.
• the blown air can be advantageously removed by a suction device arranged on the underside, so that the granulate layer has a secure hold on the surface of the storage belt.
• the granular layer is preferably passed through an oven.
• thermoplastic material For a melting of the thermoplastic material is possible, so that connect the individual granules together. Depending on the treatment temperature and treatment time, complete melting or partial melting of the microgranules can be produced. It is essential that a continuous solidified film layer is formed.
• the method variant is preferably carried out, in which the granular layer for heating and solidification is passed through at least one nip of heated pairs of rolls. This is at the same time a homogenization and a height adjustment of the film thickness possible.
• the cooled film web is preferably wound along a machine direction and / or transversely to the machine direction. treckt. This allows molecular changes in the structure to be achieved to adjust certain physical properties.
• the device according to the invention is further developed such that the forming device is assigned a drafting system through which the film web is stretched after solidification.
• the microgranulate used for producing the film web preferably consists of several types of thermoplastic materials, which are produced in a recycling process for plastic waste. It is essential here that the microgranulate produced from the plastic waste can be melted under the action of temperature.
• the film web of the invention is thus characterized by the fact that the synthetic material consists of 100% recycled plastics.
• Essentially all common thermoplastic waste plastics can be used to form the micro-granules for the production of the synthetic sheet material.
• microgranules based on PET, PP or PA can be used.
• the film web produced by molding can be preferably used as insulating and insulating material for technical applications, e.g. use in road construction.
• cover films in the agricultural sector may preferably be formed from such shaped film webs.
• FIG. 1 schematically shows a view of a first embodiment of the device according to the invention for producing a film web
• FIG. 2 shows schematically another embodiment of the device according to the invention for producing a film web.
• the device has a forming device 1, which consists of a forming head 2 and a storage belt 6 arranged at a distance below the forming head 2.
• the forming head 2 is connected via a conveyor channel 5 with a granule container 3.
• the conveying channel 5 is associated with a blower 4, so that in the granule container 3 held Mikrogranu- lat from a thermoplastic material by means of an air flow to the forming head 2 is supplied.
• the storage belt 6 is continuously guided and driven in a machine direction over a plurality of belt rollers 8.
• two belt rollers 8 are shown by way of example for clamping a belt running plane.
• the storage belt 6 is formed of a heat-resistant strip material with a fine-pored air-permeable structure.
• a strip material for example, a wire mesh or perforated metal strip could be formed with the finest meshes or perforations.
• a suction device 7 is arranged at a bottom of the storage belt 6 opposite to the forming head 2.
• the suction device 7 is connected to a vacuum source, so that a pending on the top of the storage belt 6 air can be absorbed by the suction device 7.
• the forming head 2 and the suction device 7 extend over a working width of the storage belt 6 in order to obtain a uniform suction effect over a storage surface.
• a furnace 10 which is traversed by the storage belt 2.
• a drafting device 11 with a plurality of drafting rollers 12 and a winding device 14 for forming a coil 15 are provided.
• a microgranulate of one or more thermoplastic materials is first of all introduced into the granulate container 3.
• the microgranules are preferably made from plastic waste.
• Such recycling processes are well known and will not be further described here.
• the known process from US 2013/0234350 AI is particularly suitable for producing micro-granules from plastic waste.
• the plastic waste is melted by an extruder.
• a blowing nozzle is formed, through which a fine melt stream is atomized by means of hot compressed air to form melt drops.
• melts made of different thermoplastics can also be processed into a microgranulate.
• the microgranulate stored in the granulate container 3 is fed to the forming head 2 by means of an air flow through the conveying channel 5.
• a mixing and distribution of the microgranules takes place, which takes place, for example, by a plurality of driven rotor blades.
• the micro-granules are discharged at the bottom of the forming head 2 via an air flow and placed on the surface of the storage belt 6 to a granular layer 9.
• the granulate layer 9 is conveyed in the machine direction, which is also referred to as the MD direction, and passes with the deposition belt 6 into the furnace 10.
• the granulate layer 9 is heated and solidified, so that a melted and closed material Layer sets and forms a film web 13.
• the belt speed and the oven temperature can be optionally set such that, depending on the types of plastic, a complete melting of all microgranules occurs, so that a continuous connection is formed. In principle, however, it is also possible to choose the treatment time and the treatment temperature in the furnace 10 such that partial melting occurs at the edges of the granule particles which ensure the connections between them.
• the film web 13 is fed to the drafting system 11. Within the drafting system 11, the film web 13 can be stretched in the machine direction (MD) and transversely to the machine direction (CD). Thus, the strength of the film web can be increased, which is wound up at the end of the process by the winding device 14 to form a wedge 15. Due to the nature of the synthetic film material, which consists of one or more thermoplastics, the film web is particularly suitable to allow reuse of plastic waste. Such a film web substantially formed by molding is particularly suitable for use in insulation, insulation or covering applications.
• the film web from a composite material.
• a porous and gas-permeable ultrafine film could be used to receive the granulate layer on the storage belt.
• the granule layer and the ultrafine film are joined together to form a film web.
• the embodiment of the device according to the invention according to FIG. 2 is particularly suitable.
• the embodiment of Fig. 2 is substantially identical to the aforementioned embodiment, so that only the differences will be explained below and otherwise reference is made to the above description.
• a granulate layer 9 is applied to the surface of the depositing belt 6 by the shaping head 2.
• the granulate layer 9 is then passed over the depositing belt 6 by an arrangement of several hardening rollers 16, the are disposed within the furnace 10. Between the hardening rollers 16, a nip 17 is formed, which leads in particular to the compaction of the granular layer 9.
• the nips 17 are formed differently in their gap height, so that on the outlet side of the furnace 10, a desired film thickness of the film web is achieved.
• the hardening rollers 16 arranged in the furnace 10 are preferably heated by the ambient temperature. However, it is also possible to arrange the hardening rollers 16 in a calendar-like arrangement on a frame in which the jacket of the hardening rollers 16 is heated from the inside.
• the exemplary embodiments of the device shown for carrying out the method are exemplary. It is essential here that the material of the film web is produced by a shaping of microgranulate.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Diaphragms And Bellows (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (3)

Families Citing this family (1)

Citations (8)

Family Cites Families (2)

• 2015
  • 2015-01-20 WO PCT/EP2015/050983 patent/WO2015110416A1/de active Application Filing
  • 2015-01-20 DE DE112015000444.0T patent/DE112015000444A5/de not_active Withdrawn
  • 2015-01-20 CN CN201580003748.XA patent/CN105899347B/zh not_active Expired - Fee Related

Patent Citations (8)

Non-Patent Citations (1)

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