Window profile

The amount of plasticizer added to the polymer in question varies, depending on the magnitude of the effect required. For example, a small addition of plasticizer may be made simply to improve the workabiUty of the polymer melt. This contrasts with larger additions made with the specific intention of completely transforming the properties of the product. For example, PVC without a plasticizer, ie, unplasticized PVC (PVC-U), is used in appHcations such as pipes and window profiles with plasticizer added, articles such as PVC food film, PVC cable insulation, and sheathing and PVC floorings are formed. 

Fig. 4.18 (a) Extruded panel sections (b) Extruded window profile... 

Defosse, M., Processors focus on Differentiation in Window Profiles, MP, Sept. 1999. 

In pultrusion of composites with all the reinforcement axially aligned, the pre- and postimpregnation guidance is quite straightforward. In contrast, to place mats, fabrics, and veils corrrectly to form an intricate, thin-walled, and hollow cross-section, such as a window profile, considerable ingenuity, skill, and experience are required. From a composite strength... 

CPE impact modifiers contain around 35% of chlorine and are thermoplastic in nature. With a similar melting point to PVC, they initially form a network structure which changes to a particulate structure on processing (134). They also have good processability and excellent weathering performance consequently they are also used for window profiles (287). The effect of residual... 

Particle size is important and, for some applications requiring good weathering and impact performance (window profile), the ultrafine milled, high whiteness, natural version is normally used. To ease dispersion, the filler is usually coated with stearic acid. Coated ultrafine and precipitated calcium carbonates are claimed also to have a positive effect on impact properties in impact modified formulations (52, 294, 462). The abrasive wear of calcium carbonate, on melt processing equipment, is not significant but increases with increasing levels (177). 

Polyvinyl chloride window profile formulations containing organic-based and calcium-zinc stabilisers were produced and the performance of the stabilised PVC compounds compared. Properties evaluated included rheological properties, heat stability, colour, gloss,... 

The effect of the type of impact modifier on the melt flow of a PVC window profile formulation as a function of shear rates encountered during extrusion was investigated and the relationship between the melt flow and mechanical properties of the profiles evaluated. A Rheoplast Capillary Rheometer with a pre-shearing device was employed to investigate the melt viscoelastic properties of the formulations and the performance of the formulations in terms of post-extrusion shrinkage, surface gloss and enthalpy relaxation discussed. 2 refs. 

The aim of coextrusion is outlined and the tooling available for different types of profiles, including window profiles, sidings, fences and foam profiles, is described. Machinery for coextrusion is also described and details are provided on a specially designed coextrader (BEX 2-54CC/1) equipped with negative conical screws. 6 refs. 

A discussion is presented on the switch by some councils and local housing associations from PVC to timber despite the Department for Environment, Food Rural Affairs life cycle assessment of PVC, which found that there was little to chose between PVC and alternative materials. The issue of recycling of PVC window profiles is also considered. 

LAMINATING PVC WINDOW PROFILES WITHOUT SOLVENTS Gehrke J Kleinert H Hoffmann H Dresden,Technische universitat Henkel Dorus... 

IMPACT STRENGTH AND MORPHOLOGY IN POLYVINYL CHLORIDE WINDOW PROFILES. RELATIONSHIP WITH GELATION LEVEL... 

Details are given of the effect of processing on mechanical properties of PVC window profiles by altering the temperature profile set on the extruder and by varying the shear heating phenomena using different lubrication balances. The effect of filler level and type of impact modifier on the impact properties of extruded profiles with various levels of free volume are presented. 7 refs. 

Katowice, Poland, 16th-18th Nov.1999, paper 9 NEW GENERATION CPE MODIFIER FOR PVC WINDOW PROFILES... 

INVESTIGATE PROCESSING CONDITIONS AND K-VALUE EFFECTS IN PVC WINDOW PROFILE EXTRUSION... 

Brighton, 20th-22nd April 1999, p.200-9 IMPACT PERFORMANCE OF WOOD-GRAIN FOIL COATED PVC-U WINDOW PROFILES, AND THE EFFECT OF ARTIFICIAL WEATHERING AND ABRASION Newman C J Gardiner D UK,Building Research Establishment (IOM Communications Ltd. BPF)... 

Rigid PVC extruded construction products take many forms. Typical are house siding, window profiles, storm doors, pipe, fencing, and various accessory items... 

Analytical solutions have been developed to aid the design of calibrators for simple shapes, such as sheets and pipes. More complex shapes, such as window profiles, require the use of numerical finite element methods that can model arbitrary shapes. 

Major polymer applications wire and cable, autoignition wire, roofing membranes, technical hoses, power steering hose, transmission oil cooler hose, car axle boots, automotive air ducts and hoses, impact modification for PVC in pipe, vinyl siding, window profiles and FR ABS... 

Another class of organotin heat stabilizers is the sulphur-free estertins or organotin carboxylates like dibutyltin maleate. Estertins work especially well in out-door applications like transparent and translucent double-walled panels for greenhouses, sidings, and window profiles. 

Once the lead stabilizer is incorporated into the PVC matrix, it is immobilized and is no longer bioavailable. The typical lead metal content in major applications is Pipe 0.75% Window Profile 2.7% Wire and Cable 2.0%. 

The desired frequency window profile is subject to an inverse FT and the resulting time domain function convoluted with the raw FID. Transformation of the modified data produces a spectrum containing only a subset of all resonances as defined by the digital filter. 

In the polymer engineering we call compounds those intimate solid mixtures in which the technical polymer material for a specific application contains all the necessary additives -e.g. plasticizers, lubricants, impact modifiers, heat stabilizers, antioxidants, flame retardants, colorants, etc. — making the material suitable for the given task. A typical PVC compound e g. for a window profile, consists of 8 - 10 components [4],... 

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