Plastics Technology

AUG 2016

Plastics Technology - Dedicated to improving Plastics Processing.

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and the specified notch gap was still too large, though the dimen- sions among the four cavities varied, with the fourth cavity being slightly smaller because the air was heating up as it ran through the hot steel. The point is: Do not overlook options that may not have been the norm for years. Think outside of the box and re-invent. Heat pipes or cooling tubes are also an option in some cases, but flowing water is always the best choice. I have proven this in trials—heat pipes definitely assist in cooling mold details, but never as much as actual water flow. With that said, I still use heat pipes in some situations because they are easily added in cases where adding water or a bubbler would require more work. Bubblers are one of my favorite options for cooling in tight areas, so let's look at them more closely. Bubblers are often over- looked as an easy solution to cool problem areas where normal water circuits are not an option. A bubbler only needs a drilled and tapped hole with clearance for the bubbler head and connections. There are also many options to implement bubblers internally without using the standard bubbler head. The water-line hole for a bubbler can be as small as 0.125 in.; the limitation is that the smallest bubbler tube available is 0.090 in. diam. One aspect of bubblers that is commonly overlooked is the cross-sectional area of the ID of the tube and the area between the OD and the water-line diameter. This is one reason I always recommend using high-flow stainless-steel bubbler tubes versus the common brass bubbler tubes. For example, with a 0.125-in. diameter tube, the high-flow tube has an ID of 0.109 in.; a brass tube at best has an ID of 0.069 in. The high- flow tube thus has 250% more cross-sectional area, which translates to an increase of 250% in GPM. That's why I never use standard brass tubes: They decrease your GPM potential. You must also consider the cross-sectional area between the tube and the water-line diameter so that you are using the proper tube size. Some will assume that with a 0.250-in. hole you would use a 0.125-in. bubbler tube, thinking it's half of the diameter. But you must consider the area. The area outside of the tube is 0.0368 in.2 and the ID area of the high-flow 0.125-in. tube is 0.009-in.2— that's 400% less area or GPM. With a 0.125-in. brass tube, the area is only 0.0036 in.2, which would mean 1000% Bubblers are often overlooked, but they can be a ready solution to problems in areas where normal water circuits are not an option. Regardless of your industrial, commercial, civil or even artistic needs for quality metrology, look to Exact for the answers. Our 3D and industrial-grade CT scanning equipment technologies are available to you on a sale, lease or contract service basis to suit your company requirements, data stream needs and budget. Here's an example… The data scan can be compared to a CAD file in your metrology lab or put into the point cloud for production analysis or done inline for instant validation. Or, we can perform the analysis for you in our labs. However you use us, your production and quality will improve… and we can prove it! See all we can do for you, as we've done for so many others in myriad applications, nationwide. For all your plastic scanning... M E T R O L O G Y www.exactmetrology.com CINCINNATI 513.831.6620 MILWAUKEE 262.533.0800 Toll Free: 866.722.2600 An ISO 9001:2008 and AS9100 Certified Company PART SCAN COMPARISON 40 AUGUST 2016 Plastics Technology PTonline.com K now How

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