How to improve the production of blown film machine
浏览： 次时间：2017/3/9 10:14:04

It has three Suggestions about how to improve the production of blown film machine problem

First,organize your resin changes.

For a clean transition, let resin in the extruder hopper run low but not out, while you are still running good product. Leave the extruder running at 15 rpm or more. Use compressed air to clean vacuum lines, probes, and the extruder hopper thoroughly, while letting it run empty. Hook up the connections for the next resin to be extruded. Then watch the resin level in the hopper drop until the feed section of the screw becomes visible before introducing the next resin. Slow the extruder down to 6 rpm for a minute or two to be sure the feed section is full of the new resin. Now speed up the extruder to flush it out, repeating if necessary. (Use the same procedures with purging compound.)

Second,Watch screws and barrels for wear.

Screw and barrel wear can have a major effect on pumping rate and melt-temperature control. So your screws and barrels should all be checked and measured at least once a year. Screw-to-barrel clearance is normally 0.005-0.006 in. and can be measured with special calipers. Screws worn beyond these tolerances can be rebuilt less expensively than replaced.

On the subject of barrels, grooved-feed types seem to be the best for consistent pumping rate and temperature control. But smooth-bore barrels are better for handling fluff recycling and in some cases are more accommodating for materials such as nylon and EVOH.

Third,Tune your processing conditions.

With the wide variety of raw materials and machinery available today, it's essential to match your process conditions to the particular resin and equipment. Temperature profiles, feed-throat cooling or heating, and screen-pack configurations are basic factors to be tuned. Try different temperature profiles to see which one maximizes feed rate and melt-temperature control. Screen packs should be changed routinely and especially before any resin change. Die lips, air ring, and IBC systems should also be routinely cleaned to remove resin build-up. Once conditions and outputs are optimized, make certain you have a record of the recipe, so you can repeat it next time.