Latex scrap

A more recent article that addressed the use of the DeLink process was published in Rubber Journal Asia [13]. It featured the Gujarat Reclaim and Rubber Products Company, which produces reclaimed rubber from both synthetic and NR waste, as well as a light-coloured reclaim from latex scrap using the Rubplast process. The company uses Green Rubber s patented devulcanisation agent, DeLink, at a ratio of two parts DeLink to 100 parts crumbed waste rubber, to produce a product that can be incorporated back into new rubber compounds. The article claims that this is very advantageous to the rubber industry as it enables them to re-use the 5-15% of waste, which they typically throw away. 

Binders. Latices are used as fiber binders by the paper and textile industries. The two principal methods of appHcation are (/) wet-end addition, wherein the ionic latex is added to a fiber slurry and then coagulated in the slurry prior to sheet formation, and (2) saturation of the latex into a formed fiber web wherein the latex is coagulated by dehydration. Latices are also used as binders for particulate matter such as mbber scrap. 

Latex continues to drip after the initial collection and coagulates naturally in the cup to form cup lump. Coagulum which forms as a film of latex on the tapped cut, called tree lace, or from latex that has dripped onto the ground, called earth scrap, is collected the next day along with the cup lump. Some smallholders may not collect the latex at all, but allow it to coagulate in the cup and collect it as cup lump. AH these methods produce mbber known as field coagulum. 

The lowest grade of plantation crepe rubber. It is made from earth scrap (rubber from latex which has fallen on the ground) and any other plantation salvage scrap. It was formerly called Rolled Brown Crepe. 

The coagulum formed during polymerization may take many forms and is commonly referred to by many names, often colloquial, e.g., reactor fouling, filterable solids, button, sediment, silt, grit, seeds, sand, waste, scrap, or worse. In this discussion, the term "coagulum" will be used to denote any polymer recovered in a form other than stable latex. 

Synthetic turf. The feasibility of using shredded scrap rubber as a component in synthetic tmf for play grounds, factory floors, and park paths had also been investigated. The product Tire Turf was prepared by mixing shredded scrap tires with a binder such as polyurethane, latex, or asphalt... 

Gutta-Percha g9-t9- p9r-cho [Malay gkah-percha, fr. getah sap, latex + percha scrap, rag] (1845) (GP, PI, and trans-l,4-polyiso-prene) n. A rubber-related, polymeric substance extracted from the milky sap of leaves and bark of certain trees belonging to the family Sapotaceae, genera Pala-quium, and Payena, plants native to Malaysia. Its mer has the same empirical formula... 

Carpet Recycling. By the beginning of the century, about 4.7 million tons of residential carpets were disposed of annually in the United States, with less than 5% being reused or recycled (56). Scrap carpet is bulky and difficult to collect. Efforts are underway in the United States to reduce landfilled carpets by 40% by 2012. Carpeting is a complex product consisting of 40-60 wt% of yarn from PA-6, PA-66, PET, and PP, 4-6% of primary backing made from woven PP, 38-52 wt% of adhesive made from styrene-butadiene latex with calcium carbonate as a filler. 

Four types of coagulum are collected in the field, namely cup lump, tree lace, earth scrap and smallholders lump. Cup lump is the coagulated material found in the collection cup formed from residual latex after the latex was collected from a previous tapping. It is a cleaner material than the other three. Tree lace is the coagulum strip that the tapper peels off from the previous cut before making a new cut. It is often contaminated by manganese from the bark and... 

Under different deformation conditions, natural rubber (NR) may exhibit predominant viscous flow, elastic or viscoelastic behaviour. Thus, the time for the movement of the NR molecular chains, i.e. relaxation time, is vastly affected by those deformation rate and NR types. The variation of NR types such as smoked rubber sheet, rubber blocks such as skim block, STR 5L and STR 20, is another factor that influences rheological properties and processing of NR due to their different Mooney viscosity, molecular weight distribution and gel content. Types of NRs are based on the different production processes of NR in which rubber smoked sheets are produced from NR in the latex form whereas block types are produced from various types of NR sources such as from latex in the case of STR 5L, from rubber scrap in the case of STR 20 and from skim latex in the case of skim block. 

Latex not sold as latex concentrate and cup lump, tree lace, and earth scrap are used to produce various grades of dry rubber. 

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