![\"how](\"https:\/\/gauging.com\/wp-content\/uploads\/2015\/09\/Cast-Film-Profile.jpg\" "\\"measure")
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If you have any questions, feel free to contact us here<\/a>.<\/p>\n \u6211\u4eec\u901a\u5e38\u662f\u6d4b\u91cf\u8584\u819c\u7684\u6a2a\u5411\u548c\u7eb5\u5411\uff0c\u5373\u7a7f\u8d8a\u8584\u819c\u7684\u65b9\u5411\u548c\u673a\u5668\u6eda\u52a8\u7684\u65b9\u5411\uff0c\u6765\u89c2\u5bdf\u4ea7\u54c1\u751f\u4ea7\u8fc7\u7a0b\u4e2d\u7684\u8868\u73b0\u3002\u4f9d\u636e\u751f\u4ea7\u7684\u6761\u4ef6\uff0c\u8584\u819c\u7684\u8868\u73b0\u4e5f\u4e0d\u4e00\u6837\u3002<\/p>\n \u5728\u6d4b\u91cf\u8584\u819c\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4e00\u4e9b\u72ec\u7279\u7684\u6311\u6218\u3002\u8fd9\u91cc\u6709\u4e00\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e2e\u52a9\u60a8\u3002\u70b9\u51fb\u8fd9\u91cc<\/u>ASTM <\/u>\u6807\u51c6\u5229\u7528<\/u>\u87ba\u65cb\u6d4b\u5fae\u5668<\/u>\u6765\u6d4b\u91cf\u5851\u6599\u8584\u819c<\/u>\u3002<\/p>\n \u5f53\u6211\u4eec\u50cf\u4ee5\u4e0b\u5c55\u793a\u7684\u90a3\u6837\uff0c\u5728\u7ebf\u6216\u7528\u5b9e\u9a8c\u6d4b\u91cf\u8584\u819c\u7684\u539a\u5ea6\uff0c\u8fd9\u91cc\u6709\u4e00\u4e9b\u4e0d\u540c\u7684\u95ee\u9898\u9700\u8981\u601d\u8003\u3002<\/p>\n \u50cf\u5851\u6599\u4e00\u6837\u8584\u7684\u539a\u5ea6\uff0c\u60a8\u9700\u8981\u51c6\u786e\u7684\u5de5\u5177\u6765\u5f97\u5230\u7cbe\u786e\u7684\u7b54\u6848\u3002\u60a8\u4f1a\u53d1\u73b0\u4e5f\u80fd\u5e94\u7528\u8fd9\u4e9b\u4fe1\u606f\u6765\u6d4b\u91cf\u5176\u5b83\u8584\u7684\u6750\u6599\u3002<\/p>\n <\/p>\n <\/p>\n\n \u5b9e\u9a8c\u5ba4\u6d4b\u91cf\u662f\u8d28\u91cf\u63a7\u5236\u7684\u7b2c\u4e00\u6b65 \u8bb8\u591a\u5851\u6599\u8584\u819c\u7684\u751f\u4ea7\u5546\u548c\u4e70\u5bb6\u51fa\u4e8e\u8d2d\u4e70\u6216\u8d28\u91cf\u7684\u8003\u8651\u4f1a\u60f3\u8981\u6d4b\u91cf\u8584\u819c\u7684\u539a\u5ea6\u3002 \u5e73\u5747\u539a\u5ea6\u53ef\u4ee5\u7528\u5bc6\u5ea6\uff0c\u91cd\u91cf\u548c\u4e00\u7247\u8584\u819c\u7684\u6a2a\u622a\u9762\u6765\u6d4b\u91cf\u3002 \u4e3a\u4e86\u5f97\u5230\u8584\u819c\u7684\u53ef\u53d8\u6027\uff0c\u60a8\u9700\u8981\u6d4b\u91cf\u8584\u819c\u4e0a\u4e0d\u540c\u7684\u70b9\u6765\u89c2\u6d4b\u8584\u819c\u7684\u53d8\u91cf\u3002<\/p>\n \u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u6709\u4e13\u95e8\u7684\u5de5\u5177\u6765\u6ee1\u8db3\u5ba2\u6237\u7684\u9700\u6c42\u3002<\/p>\n\n \u63a5\u89e6\u5f0f\u6d4b\u91cf\uff1a<\/strong><\/p>\n[\/highlight]\n <\/h5>\n \n \u63a5\u89e6\u5f0f\u6d4b\u91cf\u662f\u4e00\u79cd\u7b80\u5355\u6613\u61c2\u7684\u65b9\u5f0f\uff0c\u4f46\u662f\u6709\u4e00\u4e9b\u7f3a\u70b9\u3002\u87ba\u65cb\u6d4b\u5fae\u5668\u5728\u5b9e\u9a8c\u5ba4\u4e2d\u7528\u6765\u6d4b\u91cf\u539a\u5ea6\u662f\u76f8\u5f53\u5bb9\u6613\u7684\uff0c\u4f46\u662f\u7cbe\u786e\u6027\u4e0d\u5bb9\u4e50\u89c2\u3002<\/p>\n \u4f18\u70b9\uff1a<\/strong><\/p>\n \u7f3a\u70b9\uff1a<\/strong><\/p>\n \u9700\u8981\u82b1\u8d39\u5f88\u591a\u65f6\u95f4\u6d4b\u91cf\u4e0d\u540c\u7684\u70b9<\/p>\n \u5728\u8584\u819c\u4e0a\u6d4b\u91cf\u6709\u4e0d\u53ef\u91cd\u590d\u6027<\/p>\n \u5728\u6d4b\u91cf\u5e73\u5747\u539a\u5ea6\u6216\u8005\u662f\u83b7\u53d6\u5256\u9762\u4e0a\u4e0d\u5177\u6709\u73b0\u5b9e\u610f\u4e49<\/li>\n<\/ul>\n <\/p>\n ASTM \u6807\u51c6 D6988 \u63cf\u8ff0\u4e86\u5229\u7528\u51c0\u91cd\u5361\u5c3a<\/p>\n Additionally, a surface finish on a film will typically give a micrometer an error.\u00a0 Usually it will skew the reading high because the device will rest of the peaks of the rough surface.<\/p>\n\n For\u00a0most\u00a0plastic\u00a0films and especially thin films, non contacting gauging is the method of choice to get an accurate and quick reading.\u00a0 Many capacitance gauging systems are set up as profilers, such as SolveTech’s PR2000 Precision Profiler.<\/a>\u00a0 Profilers are helpful because they can provide a picture of the film thickness across the web or in the machine direction.\u00a0 You can bypass the calipers by calibrating based on the average thickness of a strip.\u00a0 This is known as the gauge by weight method<\/a>\u00a0and it is built into the PR2000 software.<\/p>\n Capacitance is the preferred method for the following reasons:<\/strong><\/p>\n Drawbacks:<\/strong><\/p>\n <\/p>\n Capacitance technology<\/a> will tell you the overall thickness of the material you are trying to measure.\u00a0\u00a0 However, coating thickness\u00a0can still be measured if you are able to\u00a0measure the material before the coating is applied and after the coating is applied.\u00a0 You can then do\u00a0 a subtraction of\u00a0the before and after to get the\u00a0delta.<\/p>\n There are other technologies on the market that can be helpful when trying to read\u00a0individual film layers using NIR for example.\u00a0 Capacitance has a drawback in that it can’t measure conductive materials and it can also be sensitive to variation in moisture levels.<\/p>\n <\/p>\n\n Measuring on line is a great tool for monitoring your quality in real time.\u00a0 Catching an error can help reduce waste and improve the products you are producing.\u00a0 Additionally, producers can sometimes down gauge their average thickness if they produce a more uniform film.\u00a0 A thin spot in the film is like the\u00a0weakest\u00a0link in a chain, so if it is eliminated, the film becomes stronger overall.\u00a0 Down gauging can save some producers a great deal of money in material costs.<\/p>\n In many cases, live feedback\u00a0control is used to help make automatic adjustments to the extruder.\u00a0 \u00a0Contact gauging is typically not practical in this case due to the high speed of the line, so non contacting methods have been widely adopted.<\/p>\n \u00a0 It is important to understand some key concepts for on line gauging, and different processes will have some different needs.\u00a0 You can measure both in the machine direction and in the cross web direction.\u00a0 Cross web measurements are more typical, but machine direction gauging is gaining in popularity.<\/p>\n \n There are several styles of blown film production equipment: no rotation, and oscillating die, and an oscillating haul off.<\/p>\n For on line gauging, there are two basic methods, on the bubble gauging, and gauging after the lay flat.\u00a0 To learn more, read our article “The Impact of Thickness Gauging on a Blown Film Plant”<\/a><\/p>\n On The Bubble<\/strong><\/p>\n Thickness gauges that measure on the bubble are used to provide the thickness of the film as it is being produced.\u00a0 They typically use a capacitance based technology, although it is different the technology SolveTech uses <\/a>for it’s capacitance gauging systems.\u00a0 These systems scan the bubble using a circular slide and\u00a0 give a relative measurement, meaning that they measure the variability across the web.\u00a0 They have difficulty measuring absolute thickness because they have trouble holding calibration.<\/p>\n They are however popular on many blown film lines because they can provide feed back control to the die.\u00a0 If the density is known, they can use gravimetric control to calculate the average thickness.\u00a0 However, in practice, the exact density is not always known or entered correctly, and the dimensions of the bubble also have to be considered.\u00a0 Some blown film companies also find these machines to be complex to operate and maintain.<\/p>\n After the Lay Flat<\/strong><\/p>\n A simpler and lest costly approach is to measure the thickness after the lay flat, meaning after the bubble is collapsed.\u00a0 SolveTech’s BF200<\/a> measures material after the lay flat using a spot along the edge or both edges.\u00a0 If either the die or the haul off is rotating, the system can map the entire bubble by measuring one point along the edge.\u00a0 This is because the bubble profile will rotate through this one point over time, and the rotation speed can be tracked.<\/p>\n Besides being simpler to operate and more economical, these systems are easily retrofitable to existing blown film lines and can hold calibration for an absolute measurement.<\/p>\n The disadvantages are that there is more process time between the creation of the material and when it is measured, and if there is no rotation on the line, you can not get a bubble profile.\u00a0 There can also be some challenges when doing feedback control when using a oscillating haul off.\u00a0 This is because twisting of the bubble can distort the profile.<\/p>\n Overall, these systems have been\u00a0widely adopted, and SolveTech\u00a0is a leader in this area with well over 150 installed.<\/p>\n <\/p>\n\n <\/p>\n For cast film, producers will often measure thickness across the web and make adjustments to their die accordingly.\u00a0 For wide webs, many customers will use a scanning gauge of some kind.\u00a0 Scanning gauges take a measurement head to scan it back and forth across the web to create a thickness profile.\u00a0\u00a0 Some typically technologies include x-ray, gamma backscatter and beta ray gauges.\u00a0 There are also some capacitance based technologies and optical technologies\u00a0that are used.\u00a0 For measuring a coating thickness, NIR or Near Infrared is popular.<\/p>\n For narrow webs less than 60 inches, many producers use a C Channel capacitance gauging system.\u00a0 SolveTech offers our unique Multichannel<\/a> which does not scan and instead offers full and contact coverage of the web using multiple channels.\u00a0 This system has been widely adopted as the standard in narrow web since it has superior performance to the other scanning gauge technologies, and it can give a high percentage of coverage.<\/p>\n <\/p>\n\n <\/p>\n Biaxial Film is stretched in two directions.\u00a0 Therefore, along with measuring the cross web like in cast film, \u00a0it may be important for the producer to measure the thickness variability in the machine direction.\u00a0 This is a SolveTech specialty due to our unique gauge design, and for more information, you can visit our page on machine direction gauging<\/a>.<\/p>\n <\/p>\n In summary, there are several methods available\u00a0to measure plastic film thickness, and the one you select depends on your need and process.\u00a0 \u00a0You can learn more about what thickness gauging can do for a blown plant here<\/a>.<\/p>\n <\/p>\n\n Off Line\u00a0\u79bb\u7ebf\u5b9e\u9a8c\u539a\u5ea6\u6d4b\u91cf\uff1a<\/span>\n <\/h4>\n
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![\"Micrometer](\"https:\/\/gauging.com\/wp-content\/uploads\/2015\/09\/IMG_0405-300x300.jpg\" "\\"measure")
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\n Non Contact\u00a0 Gauging <\/span>\n <\/h5>\n
![\"non](\"https:\/\/gauging.com\/wp-content\/uploads\/2014\/07\/PR2000-logo-Cropped.png\" "\\"non"){kind=logo}
<\/p>\n![\"Plastic](\"https:\/\/gauging.com\/wp-content\/uploads\/2014\/12\/Precision-Profiler.png\" "\\"Plastic")
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\n On Line\u00a0 Thickness Gauging<\/span>\n <\/h4>\n \n
![\"Cross](\"https:\/\/gauging.com\/wp-content\/uploads\/2015\/09\/Cross-Web-vx-Machine-Direction-2.png\")
<\/a><\/p>\n\n Blown Film\u00a0 Gauging <\/span>\n <\/h5>\n <\/a>
![\"Blown](\"https:\/\/gauging.com\/wp-content\/uploads\/2014\/02\/5f28d6678c5f82d829f87ac340ad31e8.jpg\")
<\/a><\/p>\n![\"BF200](\"https:\/\/gauging.com\/wp-content\/uploads\/2014\/07\/BF200-Screen-Shot-copy.png\" "\\"Blown")
<\/a>\n Cast Film\u00a0 Gauging <\/span>\n <\/h5>\n \n
![\"On](\"https:\/\/gauging.com\/wp-content\/uploads\/2015\/09\/Scanning-Gauge-Comparison-Mock-Up.png\" "\\"Measure")
<\/a><\/p>\n![\"Measure](\"https:\/\/gauging.com\/wp-content\/uploads\/2014\/07\/Surface-Zone-Run-1.png\" "\\"Plastic")
<\/a>\n Biax Film\u00a0 Gauging <\/span>\n <\/h5>\n \n