1、 TSB-62-9 June 2009 ITM-9 Method for Evaluating Optical Fiber Ribbon Mechanical Strip Efficacy NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and i
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22、S. ITM-9iITM-9Method for Evaluating Optical Fiber Ribbon Mechanical Strip EfficacyContentsForeword iii1 Introduction 12 Normative references . 23 Apparatus . 24 Sampling and specimens 35 Procedure 46 Calculations or interpretation of results . 47 Documentation 5Annex A (informative). 6ITM-9iiThis pa
23、ge left blank.ITM-9iiiITM-9Method for evaluating optical fiber ribbon mechanical strip efficacyForewordFrom TIA Standards Project No.3-0306, formulated under the cognizance ofTIA FO-42.12, Subcommittee on Optical Fibers and Cables.This ITM is part of the series of test methods included within TIA/EI
24、A TSB-62.There is one annex, which is informative.Key words: coatings, stripping, ribbon, strip-ability, mechanical stripper.ITM-9ivThis page left blank.ITM-911 Introduction1.1 IntentThis procedure is used to quantitatively evaluate the cleanliness of mechanical/thermalstripped ribbon. It provides a
25、 method for evaluating the critical attributes for field use:fiber cleanliness after coating removal, and likelihood of fiber breakage.While the test provides apparently objective results, not all of the variables ofmechanically stripping ribbons under field conditions are easily de-confounded. By e
26、xample, a single technician, using a single tool, can objectively compareease of stripping different manufacturers ribbons as well as how completely theircoatings are removed. Changing the tool or the user yields irreproduciblecomparisons between manufacturers ribbons (even ribbons of a like design)
27、. By further example, a single manufacturers ribbons can be used to compareefficacy of different stripping tools, but not if different technicians use them.It is possible, through careful experimental design, to de-confound the independentvariables affecting mechanical ribbon stripping. However, thi
28、s treatment is beyond thescope of this TSB and is unnecessary for obtaining useful field data. Specifically, thisTSB does not consider every variable necessary for an objective strip force comparisonbetween different manufacturers ribbons.1.2 ScopeThis test procedure applies to multiple-fiber ribbon
29、s. It can be performed on ribbons asmanufactured or after their exposure to various environments.1.3 BackgroundOptical fiber ribbon coatings are stripped prior to making splices. The ease of coatingremoval and fiber cleanliness subsequent to stripping are two important factors inchoosing ribbons for
30、 specific applications. Fiber cleanliness and breakage duringmechanical removal of the coating may be dependent on a number of strippingparameters (strip speed, strip length, etc.). This procedure suggests parameters thatshould be controlled to facilitate repeatability and comparisons. This procedur
31、e alsoprovides a method for quantifying fiber cleanliness and breakage.1.4 HazardsAvoid physical contact with the hot surface of the stripper as it may produce severeburns when in operation.ITM-922 Normative ReferencesTest or inspection requirements may include, but are not limited to, the following
32、references:TIA/EIA-455-B Standard Test Procedure for Fiber Optic Fibers, Cables, Transducers,Sensors, Connecting and Terminating devices, and other Fiber Optic Components3 ApparatusA wide range of tools are commercially available for mechanically stripping ribboncoatings. The most important factors
33、in field use are repeatability and durability. Thecoating removal measurements obtained should be repeatable, subject to thelimitations noted in section 1.1.3.1 Stripping tool parametersThe results of this test are strongly dependent upon the design of the tool used, so itis important that the follo
34、wing tool design guidelines be controlled and recorded.a. The mechanical stripping tool should provide a heated surface, thetemperature of which can be adjusted. Consult tool manufacturer forrecommended settings. The heated surface(s) should be located behind thestripping blades and positioned to he
35、at the part of the ribbon where coating willbe removed. Follow the ribbon manufacturers recommendations for settingsand time to hold ribbon in the heated section prior to stripping.b. The stripping tool or loading fixture should maintain a uniform pressuresufficient for proper stripping. Care should
36、 be taken such that the tool does notbegin to open during stripping.c. The gap size between blades is critical. This dimension and its toleranceshould ensure that the blades cut through the matrix material and into the fibercoatings without damaging the glass. Gap size can change through normaluse.
37、Refer to the tool manufacturer for appropriate maintenance procedures.d. The condition and alignment of the tool blades can greatly affect the peakstrip force and stripping action. Inspect the edges of the stripping tool blades fornotches and burrs under normal vision prior to and after use. Blade l
38、ife istypically improved by cleaning according to manufacturers recommendations.Note: Follow the tool manufacturers maintenance recommendationswhenever tool performance cannot be restored by field adjustments.Many tools are not field adjustable.ITM-933.2 Positioning and holding equipmentOptical fibe
39、r ribbons should be held firmly in place so that no slippage occurs duringstripping. The ribbon fibers should be aligned with the plane of the stripping motion.Most mechanical strippers incorporate a ribbon holding clamp for this purpose.Furthermore, most of these clamps are compatible with fusion s
40、plicers from the samemanufacturer.3.3 Stripping the coatingOperate the mechanical stripper according to the ribbon manufacturersinstructions. Variation in strip force (presuming all other factors are constant) isone subjective measure of proper tool function. As blades wear or move out ofposition, s
41、trip force changes perceptibly. Additionally, strip force may besubjectively judged or even measured to determine the relative ease of strippingvarious manufacturers ribbons.3.4 Alcohol wipeWipe fibers after stripping with a lint free cloth or tissue saturated with pure(99.9%) Isopropyl Alcohol. Do
42、not re-wipe except with a new surface (replacementwipe or fold to get a clean face). Repeated wiping is usually counterproductive,increasing the likelihood of fiber breaks.4 Sampling and specimens4.1 Representative samplesThe test specimen should be representative of the population of ribbons undere
43、valuation. A maximum of ten strips and a minimum of five strips arerecommended per specimen. The different specimens can be taken sequentiallyalong the length of the ribbon, excluding sections of the ribbon previously held in thegrips of the stripping tool.4.2 Strip lengthMatrix and fiber coatings s
44、hould be removed in approximately 25 mm lengths orgreater. Stripping should be performed for the tools designed strip length. Whilemechanical strippers can generally strip shorter lengths, “nibbling” short lengthsincreases the probability of fiber breaks.ITM-944.3 PreconditioningPrecondition samples
45、 for a minimum of 2 hours at the standard test conditionsdescribed in Section 6 of TIA-455-B (Room temperature: 23 + 5C).5 ProcedureThis procedure involves using a precision tool to remove the ribbon matrix and fibercoating, wiping the exposed fibers, inspecting for broken fibers and determining a s
46、triprating.5.1 Turn the stripper system on, allowing the tool temperature to stabilize. Most unitshave a visual indicator of proper operating temperature.5.2 The ribbon stripping specimen should be tested at 23 5C and the relativehumidity should be between 20 and 70 %.5.3 The area around both blades
47、 of the stripping tool should be free of debris and/orbuild-up after each strip. Ensure that the blades are clean, and then place the ribbonin the stripping tool.5.4 Follow the ribbon and/or tool manufacturers recommendations. At the writing ofthis TSB, most field strippers worked as follows. The to
48、ol consists of two parts whichslide apart. Place the ribbon in the clamping holder. Place the holder in thecorresponding well in the stripper. Grasp the thermal portion of tool in one hand, andthe ribbon clamping portion in the other hand. Close the covers on tool and apply firmpressure. When the li
49、ght indicates proper temperature is achieved after theappropriate time indicated by the ribbon and/or tool maufacturer, smoothly pull theclamp end of the stripper, holding the heater end stationary. Most manufacturersindicate this pulling action should take 1-2 seconds.5.5 Wipe the stripped fibers, then inspect for cleanliness or broken fibers (using normalvision). Record observations according to Section 6.5.6 Record the number of fibers in the ribbon and the number of breaks.6 Calculations or interpretation of resultsEvaluate the results with normal, unaided visi
