Plastics Processors

BRYDSON, J. A., Flow Properties of Polymer Melts, (2nd Edn), Geo. Godwin, London (1981) BRYDSON, J. A., Handbook for Plastics Processors, Butterworth-Heinemann, Oxford (1990) CRAWFORD, R. J., Plastics Engineering, 2nd Edn, Pergamon, Oxford (1990)... 

Polynorbomene is also of interest to the plastics processor since by using a dry blending process for mixing and a modified injection moulding process for fabricating, the use of conventional rubber-processing equipment may be avoided. 

Represents more than 400 manufacturers of polymers, additives, and machinery as well as all types of plastics processors and fabricators. Membership is divided into 15 Business Groups sharing four Market Sector Groups. 

Cost-effective production of high-quality plastic products is the prime target of the plastic processor. As an example, the continually growing pressure from the competition demands the choice of IMMs with the smallest possible injection and clamping units in order... 

Ashland distribution company, a division of Ashland inc. http //www.ashlandchemical.com/gp.html. The General Polymers Division of Ashland Distribution Company stocks virtually every grade of prime thermoplastic resins and specialties for plastics processors. General Polymers represents and distributes product for the following plastics manufacturing businesses ... 

Heineck D.W. and Rader C.P., Thermoplastic elastomers Economical rubber products for the plastic processors, Plastics Eng., 45, 87, 1989. 

Plastic additives are a diverse group of specialty chemicals that are either incorporated into the plastic product prior to or during processing, or applied to the surface of the product when processing has been completed. To a great extent, the selection of the appropriate additive is the responsibility of the plastic processor or the compounder carrying out the modification. Scheme 1.1 illustrates the use of typical additives in the process from polymerisation to product manufacturing. 

The effects of amendments to the Environmental Protection Act (1990), which relate to pollution control and styrene emissions from installations, on UK fibre reinforced plastics processors are examined. Possible cost-effective abatement solutions are briefly considered. 

The carbon black plastic concentrates are often not prepared by the plastics processor. They may be purchased, from the pigment-black manufacturer in the form of chips, pellets, or powders. Black-plasticizer pastes (e.g., black/DOP pastes for tinting plastisols) and water- and solvent-based dispersions (e.g., for fiber manufacture) are also commercially available. 

Ultraviolet absorbers continue to be the most widely used stabilizers. Such products must have long-term stability to ultraviolet light, be relatively nontoxic, heat stable, have little color, must not sensitize the substrate, and must be priced at levels which the plastics processor can tolerate. The principal classes of chemicals meeting these requirements at present are the 2-hydroxybenzophenones, and 2-(2/-hydroxyphenyl)benzotriazoles, substituted acrylates, and aryl esters. Typical compounds representative of these classes are 2-hydroxy-4-octoxybenzophenone, 2-(2 -hy droxy-5 -me thylphenyl) be nzotn azole, ethyl-2-cyano-3,3-diphenyl acrylate, diinethyl / -methoxybenzylidene maJonate, and / -ter -octylphenyl salicylate. 

Germany s Bayer AG has invested in a 1.8 billion plant in Shanghai that will produce the same chemical. U.K.-based medical plastics processor Flexicare Medical Ftd. built a 40,000 square foot injection molding and extrusion factory in Dongguan. 

The methods whereby titania pigments are incorporated into plastic matrices are diverse. Multiple options exist for the plastics processor, including solid concentrates, direct end-use pigmentation, simple dry blends, or the use of liquid colorants. A simplified breakdown of how major resin categories are pigmented is shown in Table 10.1. 

There may even be some new opportunities under this law, as plastics processors who now paint or otherwise use a solvent-based coating on their products may be forced to stop coating and use molded-in color. 

The Italian association for plastics processors, Unionplast, has been collecting figures for many years with the aim of devising a feasible recovery and recycling system for end-of-life plastic products, and has carried out a market survey specifically regarding PVC pipes and pipe-fittings. This article provides details of the association s findings. UNIONPLAST... 

In our own company we have found a centralized marketing intelligence system to be of particular help to us in operating as a part of the fast-moving plastics industry. After a three-year trial-and-error period, we have now developed a system of a semiannual compilation of a rather complete assortment of market information derived from reports prepared on approximately 1500 plastics processors and end users. 

OBPA is the most toxic and requires approximately 0.04% active ingredient in the final product. Less toxic active ingredients such as Flopet require a loading of 1.0% to achieve a similar level of protection. Antimicrobials are generally formulated with a carrier into concentrations of 2-5% active ingredient and are available to plastic processors in powder, liquid, or solid-pellet form. The carrier is usually a plasticizer, such as epoxidized soybean oil or diisodecyl phthalate. 

Compounded WPC pellets are an expensive feedstock option. However, the high initial cost is offset by the fact that these can be molded with less expensive and less complex machines without the need for any additional processing and specialized handling equipment for wood flour. A number of companies have set up plants to produce compounded WPC pellets to sell on to plastics processors. In the compounding process, the filler (wood flour) and additives are dispersed in the molten polymers to produce a homt eneous blend. 

During the last decade, environmentalists have fought strongly to ban the use of brominated fire retardants, and already a number of plastics processors have voluntarily switched to non-halogenated ones (such as phosphate esters, aluminium trihydride and magnesium hydroxide fire retardants). Still, there are two contradictory forces in the fire retardant industry, one is the constant push for stronger fire-safety standards, and the other is the move to eliminate flame-retardants seen as persistent, bioaccumulative or toxic [19]. 

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