B & P Littleford manufactures PVC mixers in a variety of sizes with customizable parts, absolutely tailored to our clients ‘ needs. Integral to the blend arrangement, our high travel rapidly PVC mixing systems allow for high productiveness with PVC compound, mixing and more .
PVC Dry Blend Preparation
historically, plasticizers have been used to change hard PVC resins into flexible products with the craved softness. The mechanism involves the neutralization, by plasticizer molecules, of the van five hundred Waals forces between the polymer chains. Depending on the degree of balminess required, the measure of plasticizer added ( parts per hundred of resin ) can vary from approximately 20-120 parts .
In order to permit ease of material handling and promote process, the plasticizer must be wholly absorbed by the PVC resin, producing a dry, free-flowing, powder – hence the name “ dry blend ”. This is achieved by heating the resin to a temperature of approximately 200°F, causing the resin to expand and then absorb the add plasticizers. For highly plasticize blends, normally above 50 PHR, the extra parameter of time is needed to assure a dry blend .
Since PVC dry blends are normally followed by “ fluxing ” devices, such as a banbury or pelletizing extruder, there is no indigence for an acute mix dispersion as would be obtained in a B & P Littleford high-intensity sociable. furthermore, since hertz times are short in the intensifier mixer, there is frequently not sufficient time for exhaustive plasticizer absorption in highly plasticize blends.
These highly plasticize “ dry blends ” have normally been prepared in large, slow-moving, jacket ribbon blenders where the initial dispersion and plasticizer assimilation take stead. The blend and temper blends are then fed immediately to a banbury mixer, pelletizing extruder, or are cooled and stored for far serve.
While ribbon blenders have been used in this application for a number of years, they were found to be ineffective desegregate and heat transportation devices. Cycle times were frequently in the neighborhood of 45-60 minutes. besides, if color corrections were necessary, an extra 15-20 minutes was needed to insure a fair-good distribution.
High Speed PVC Mixing Systems
B & P Littleford ‘s process engineering and PVC mixer machine award a wholly modern concept of PVC dry blend readiness that has proven to be victor to existing ribbon blender processes. The alone blend natural process developed in the B & P Littleford “ average saturation ” mixer insures a rapid and accomplished distribution of all ingredients and effective heat transfer. The mix natural process is developed by the call on of plow-shaped mix tools at a rush sufficient to cause the materials of mix to become a pulsate, “ mechanically fluidized ” bed. This permits individualization of particles that not lone results in rapid and accurate mix but exposes fantastic particle coat area for exceptionally debauched inflame remove. If necessity, the mixer can be equipped with high-speed chop devices for lend de-agglomeration and dispersion of minor ingredients. The mixing cycle in a B & P Littleford mixer, depending on the materials of mix ( parts plasticizer, etc. ) is in the range of 15-20 minutes. Color corrections to the batch, of necessity, can be made in a couple of minutes .
The B & P Littleford PVC sociable, being a horizontal cylinder, eliminates a wet band buildup trouble that frequently occurs on the square sides of a ribbon blender ; this buildup may fall into the ribbon blender batch during empty .
You can confide in us as your PVC mixer supplier. The B & P Littleford PVC Mixer’s design has been thoroughly tested in the lab and prove in the field many times. The mixers can be purchased in a diverseness of sizes to meet most all production requirements. B & P Littleford can besides assist in supplying amply automated summons systems or the interfacing of mixers with existing equipment .