Paper machine belt

Abstract

The invention relates to a paper machine belt, some of the threads or all of the threads being made partially or entirely of a bioplastic.

1 . A paper machine belt, characterised in that some of the threads or all of the threads are made partially or entirely of a bioplastic. 
     
     
         2 . The paper machine belt according to  claim 1 , characterised in that the bioplastic is produced using one or more renewable raw materials, in particular plant raw materials. 
     
     
         3 . The paper machine belt according to  claim 1 , characterised in that the bioplastic is not biologically degradable. 
     
     
         4 . The paper machine belt according to  claim 1 , characterised in that the bioplastic is created such that it does not degrade or only degrades biologically after the paper machine belt has become inoperative under the environmental conditions in a paper machine. 
     
     
         5 . The paper machine belt according to  claim 1 , characterised in that the bioplastic or its raw material is chosen from a group that consists of starch, cellulose polymer, polylactic acid (PLA), polytrimethylene terephthalate (PTT) made of bio-based 1,3-propanediol (PDO), bio-based polyamide (PA), polyhydroxyalkanoate (PHA), bio-based polyethylene (PE), polyvinyl chloride (PVC) made of bio-based ethene or ethyne, bio-based polybutylene terephthalate (PBT), bio-based polyphenylene sulfide (PPS), bio-based polyethylene terephthalate (PET), bio-based polyethylene-co-isosorbide terephthalate polymer (PEIT), polyurethane (PUR) made of bio-based polyol and/or bio-based isocyanate. 
     
     
         6 . The paper machine belt according to  claim 1 , characterised in that the paper machine belt has a thread system with threads or is made of the latter, some of the threads or all of the threads being made partially or entirely of a bioplastic. 
     
     
         7 . The paper machine belt according to  claim 6 , characterised in that the thread system forms one or more woven or knitted fabrics or non-woven yarn layers or combinations of the latter and/or a spiral link band. 
     
     
         8 . The paper machine belt according to  claim 6 , characterised in that there are threads in the thread system which are in the form of monofilaments and/or multifilaments. 
     
     
         9 . The paper machine belt according to  claim 6 , characterised in that the thread system has a number of layers and that at least one layer contains threads or consists of threads which are made partially or entirely of a bioplastic. 
     
     
         10 . The paper machine belt according to  claim 6 , characterised in that the thread system has a number of layers and that at least one layer contains threads which are made partially or entirely of a petrochemical plastic. 
     
     
         11 . The paper machine belt according to  claim 9 , characterised in that one layer of the thread system is in the form of a woven fabric and a further layer is in the form of a non-woven layer. 
     
     
         12 . The paper machine belt according to  claim 6 , characterised in that there are threads within the thread system which are partially made of the bioplastic and partially of a petrochemical plastic. 
     
     
         13 . The paper machine belt according to  claim 12 , characterised in that the threads are in the form of core/sheath threads and that the core is made of the bioplastic and the core of the petrochemical plastic or vice versa. 
     
     
         14 . The paper machine belt according to  claim 12 , characterised in that there are threads in the thread system which are in the form of multifilament threads or yarns, some of the filaments being made of the bioplastic and some of the filaments being made of the petrochemical plastic. 
     
     
         15 . The paper machine belt according to  claim 6 , characterised in that the paper machine belt is in the form of a forming fabric and the threads which are made partially or entirely of the bioplastic have properties within the following ranges:
 thread diameter: 0.08-0.5 mm;   tensile force: 2-110 N;   thread extension upon breakage: 10-32%;   thread elasticity modulus: 80-9250 N/mm 2 .   
     
     
         16 . The paper machine belt according to  claim 1 , characterised in that the paper machine belt is provided with a coating and the coating is made partially or entirely of a bioplastic. 
     
     
         17 . The paper machine belt according to  claim 1 , characterised in that the paper machine belt is provided with a fibre layer and the fibre layer is made partially or entirely of a bioplastic. 
     
     
         18 . The paper machine belt according to  claim 2 , characterised in that the bioplastic is not biologically degradable. 
     
     
         19 . The paper machine belt according to  claim 2 , characterised in that the bioplastic is created such that it does not degrade or only degrades biologically after the paper machine belt has become inoperative under the environmental conditions in a paper machine. 
     
     
         20 . The paper machine belt according to  claim 3 , characterised in that the bioplastic is created such that it does not degrade or only degrades biologically after the paper machine belt has become inoperative under the environmental conditions in a paper machine. 
     
     
         21 . A paper making machine, comprising: a forming part, a press part and a drying part, each of the parts having positioned and movable therein a paper machine belt, at least one of the paper machine belts is manufactured from a bioplastic selected from the group consisting of starch, cellulose polymer, polylactic acid (PLA), polytrimethylene terephthalate (PTT) made of bio-based 1,3-propanediol (PDO), bio-based polyamide (PA), polyhydroxyalkanoate (PHA), bio-based polyethylene (PE), polyvinyl chloride (PVC) made of bio-based ethene or ethyne, bio-based polybutylene terephthalate (PBT), bio-based polyphenylene sulfide (PPS), bio-based polyethylene terephthalate (PET), bio-based polyethylene-co-isosorbide terephthalate polymer (PEIT), polyurethane (PUR) made of bio-based polyol and/or bio-based isocyanate.