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Static and Dust Fundamentals - 31 (Table of contents) |
Until the last number, we had covered 2 Problems caused by the static, 3 Fundamentals of the static, 4 Fundamentals of dust, 5 Fundamentals of antistatic and anti-dust measures, and 6 Antistatic and anti-dust measures of new age. In this number we discuss 7 Anti-static/dust measures with full of errors.
7.Antistatic and anti-dust measures with full of errors
7-4 Antistatic and anti-dust measures on plastic goods moldingr
7-4-1.Static and dust problems on plastic moldings
(1) Burrs and molding chaffs adhere to the dies.
(2) Dust adheres to the dies.
(3) Products remain in the dies during ejection process.
(4) Pellets attract the dust which eventually is mixed in products.
(5) Workers may get an electric shock touching a pellet pneumatic
transportation hose.
(6) Pellets adhere to the inside of the hopper to make a material switching
difficult.
(7) Master-batches adhere to the containers so as to cause materials to
become inhomogeneous, color to mottle or shade.
(8) Foreign materials attach to the molded goods.
7-4-2.Anti-static/dust measures on plastic moldings
1. Conventional anti-static/dust measures
(1) Ionizing (diselectrifying) with blow into the dies
(2) Ionizing of the molded products taken out of the dies
(3) Ionizing with blow from above or squarely in the face of inspectors
(4) Ionizing with air injected into the pneumatic transportation hose of
the pellet
(5) Ionizing performance required for pellet being lacking
2. New anti-static/dust/foreign-materials measures
(1) Ionizing (diselectrifying) with no blow into the dies
(2) Inactivating the dust floating around the dies
(1) Ionizing the plastic molded goods without air blow
(2) Replacing an overhead air-supplied static ionizer hanging down from
above the head of inspector with an air-free ionizer
(1) Injecting no air into the pneumatic hose for pellets
(2) Dissipating the static charged on pellets inside the molding hopper
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