SANITY INTERNATIONAL

Odhav, Ahmedabad, Gujarat

Chrome plating adds only about 15-20 % to the cost of a typical screw and it provides so many benefits with almost no performance disadvantages. Yet many processors opt not to go with such screws. Although most processors are familiar with chrome-plating, there is an important specification to be considered in purchasing a chrome-plated screw or having a repaired screw chrome-plated. The critical specification is the depth of the plating. It is not enough to plate a screw with less than .02 mm (referred to as flash chroming). Flash chromed screws tend to nick and then peal off into the resin causing reject parts and opening the screw to severe wear to the unprotected, typically, soft 4000 series alloy steel. Chrome-plating should be at least .007 mm to .12 mm dia metricaly thick and guaranteed by your supplier. Such screws are mainly to be used for the corrosive and other free flow material, because chomre plating screw lots of cause of burning problem and degrading problem can be solved

A 4140 alloy steel screw can be nitrided satisfactorily, however, a nitriding steel (such as Nitralloy 135M) has aluminum added to give a better response in nitriding hardness, both as to consistency and depth. There are two types of nitriding that are common to screw manufacture: Gas Nitriding and Ion Nitriding. Gas Nitriding is used to create a surface hardness on the screw. The hard layer of steel will vary in depth from .007 to .015 depending upon the length of the nitriding cycle. The hard layer (usually well above 60 Rc) is achieved by heating the steel in an atmosphere of nitrogen (ammonia gas) at temperatures of 950 to 1050 degrees F. The nitrogen atoms are diffused into the surface of the steel, combining with nitride-forming elements, such as chromium, aluminum, molybdenum, vanadium, tungsten and titanium, to produce a very hard surface, particularly for the first .002 to .005 depth. Nitrided screws have a very good wear resistance until the surface hardness is worn away. After the surface is worn .007, wear accelerates and the screw may quickly be worn to a condition that is beyond repair

Pioneer in bimetallic barrel technology, manufactures bimetallic extrusion barrels. These are produced so as to provide highest quality standards. The most innovative wear resistant packages for good performance, quality and optimized processes are offered by Sanity. Benefits: Wise selection of the optimum alloys for the wear resistance requirements and specific abrasive provides a good and an extended work life.Precision fit between screw and barrel for a longer period of time provides an increased product quality and throughput.No degradation or contamination of the process due to no seams trapping polymers (for barrels up to 6100 mm [240])Productivity is enhanced.Features: Engineered barrels are developed with full precision to provide superior physical and chemical properties for a full domain of process environments.There is better straightness during heat cycles, less inherent stress, through high quality proprietary backing steel for the ultimate quality in strength and straightness

Industry leader in bimetallic barrel technology manufactures the bimetallic injection barrels. Highest quality standards are provided by these efficient barrels. Continuously improved alloys guarantee optimum process conditions. Benefits: Through wise selection of the optimum alloys for the wear resistance requirements and specific abrasive, an extended work life is provided.Increased throughput and product qualityProductivity is enhanced.For barrels Eliminates contamination of the process or degradation through One piece barrel construction i.e. of up to 6100 mm (240)

Leader in bimetallic barrel technology, manufactures the bimetallic twin barrels, which primarily meets all of the OEM specifications. These specifications can be regarding dimensions, straightness and parallelism. Benefits: Work life is enhanced as it offers resistance to wear and tear.Precision fit between screw and barrel for a much longer period of time and optimum screw-barrel compatibility increases throughput and quality.Even Productivity is enhanced.Features: Has superior chemical and physical properties through precised engineered barrels.Has broadest offering of alloys which facilitates Optimum wear solutions and that too from general purpose to the most complex applications for all resins.There is less inherent stress and better straightness during heat cycles that provides ultimate strength and straightness. This all is facilitated by high quality of backing steel.

These are generally considered ball-check Screw Tip sets s. The entire valve is fixed to the feed screw flow through channels on the inside of the Screw Tip Set with a ball or pin to control flow. These designs offer the best consistency for shot control; however, many designs offer very limited flow volumes and can be difficult to purge. Having a fixed rotation with the screw, the largest wear impact is on the outside diameter. General wear of this outside surface dictates the useful life of the Rings . Injection molding valves are subject to extreme forces of temperature, pressure, torsion, abrasion and impact. These forces impact different design valves in various ways, based on factors like injection pressure, screw speed and the materials processed. The most common force concern of molders tends to be the abrasion and wear generated from it. This design provides very high flow volumes compared to other designs, using a concept which supports the ball allowing only lateral movement. This allows the use of larger sealing surfaces as well as flow areas, providing volumes that in many sizes offer similar flow to standard ring valves. The front discharge provides improved flow characteristics over tip and side flow designs, with replaceable internal wear components for extended use. This type of Screw Tip Set are used in such applications where other ball check designs create screw recovery and purging issues