ISSN:0193-7197    

DOI:10.1002/vnl.730090102

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractInjection molding rigid PVC is no longer the chore it once was. Advances in resin properties, additive systems, and molding equipment have allowed injection molders to take advantage of PVC's favorable economic, weatherability, flame retardant, and chemical resistant properties. As a result, injection molding of PVC is entering a new era. With the proper equipment and formulations, today's PVC molder is graduating from pipe fittings to ever more profitable, yet demanding, parts and applications.

ISSN:0193-7197    

DOI:10.1002/vnl.730090103

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractThe existence of fisheyes or gels in PVC final products has been a problem which the PVC industry has coped with for many years. The classical gel is a non‐porous PVC particle which cannot absorb plasticizer. Other finished product defects which may be classified as gels by a customer are unfused particles of higher molecular weight resin or resin gels and agglomerates caused by improper mixing procedures called compound gels. Although this paper will define and cite examples of resin gels and compound gels, it will deal primarily with classical gel. Over the years, many different gel tests have been used by PVC suppliers and consumers in order to define the gel level of a particular sample of resin. The most common of these tests is the test using a two roll mill to produce a colored mill sheet which is examined and the number of gels reported. This paper will use statistical methods to the factors which can introduce variability into the test results, including mill roll gap, mill speed, milling time, and temperature. In addition, the nature of the distribution of gels in a sample of PVC resin will be discussed. Finally, the paper will delve into new laboratory techniques which may lead to eventual automation of counting and reporting of gel levels in a resin sampl

ISSN:0193-7197    

DOI:10.1002/vnl.730090104

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractComparative studies of melt processability showed that chlorinated polyvinyl chloride (CPVC) had low melt index and high Brabender melt temperature and torque, as compared with conventional rigid polyvinyl chloride (PVC). Of 3 processing aids at 10 percent concentration, triphenyl phosphate increased melt index 30‐fold, fusion rate 10‐fold, melt temperature 20°C, and torque 31 percent in CPVC. Two other processing aids, an acrylic and a styrene/acrylonitrile copolymer, were less effective. Improvements in PVC were less dramatic than in CPVC. Overall, use of processing aids made CPVC processability equal or even superior to conventional rigid

ISSN:0193-7197    

DOI:10.1002/vnl.730090105

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractA method has been developed for the determination of the amount of acid gas produced during the thermal decomposition of PVC formulations. A method was required to support a program to reduce acid gas generation by retention of hydrogen chloride in the char phase. The traditional method (a modified Schoeniger) produces inaccurate and irreproducible results due to uncontrolled combustion. Other methods often take an excessive amount of time to run and may need expensive and unusual equipment. The test described here is accurate, fast, reliable, reproducible, and requires equipment which is readily available in a typical chemical laboratory. The method is based on the modified Schoniger test, but the sample is thermally decomposed by the action of a small coil of electrical resistance wire. The sample is held in a porcelain boat inside the heating coil. The thermal decomposition of the compound can thus be carefully controlled. The present paper describes studies of the effect of sample size and coil power on acid gas generation. It also presents results of other tests, for comparison purposes.

ISSN:0193-7197    

DOI:10.1002/vnl.730090106

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractA new compound for vinyl bottle applications has outstanding taste and odor properties, good thermal stability and color, excellent clarity, gloss, and blush resistance, solving many of the traditional problems associated with these applications. It is shown that blush (haze developed on exposure to alcohol/water) cannot be accelerated, but should be measured by aging at the maximum temperature at which the product is likely to be exposed.

ISSN:0193-7197    

DOI:10.1002/vnl.730090107

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractA review of the criteria and benefits of a successful quality control program is presented from the perspective of PVC compounders. An application of Analysis of Variance in identifying the most significant sources of inconsistencies in the manufacturing operation is illustrated.

ISSN:0193-7197    

DOI:10.1002/vnl.730090108

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractThe personal computer has started a revolution in the way data is collected and stored by bringing computer capabilities within the economic reach of even the smallest company. Computer data acquisition and manipulation expands the usefulness of the already valuable torque rheometer as a tool for both rheological studies and routine quality control testing. Analysis of more fundamental rheological properties than just the traditional torque vs. time curve is possible without the time consuming manual data manipulation. Data storage and recall of routine or Q.C. testing for accurate comparisons of results is made easier. Torque rheometer uses made easier by the use of a computer are reviewed. Also given are details of how to hook up a personal computer to an existing torque rheometer.

ISSN:0193-7197    

DOI:10.1002/vnl.730090109

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractThe fundamentals of plastisol rheology must be understood in order to properly select and utilize plastisol property measurements. Useful evaluation should also be made of the rheological effects of formulation ingredients and their interrelationships. Other factors such as plastisol preparation, storage conditions, process shear rates, temperatures, dwell times, and finished product specifications will influence the design of effective test procedures. Once meaningful plastisol property measurements have been developed, better quality control assurance results, and in addition quality, productivity, and profitability improvements are effected.

ISSN:0193-7197    

DOI:10.1002/vnl.730090110

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY

ISSN:0193-7197    

DOI:10.1002/vnl.730090101

出版商:Society of Plastics Engineers    

年代:1987

数据来源: WILEY