How to Block Your Knits: a Tutorial + Helpful Tips

Total Page:16

File Type:pdf, Size:1020Kb

How to Block Your Knits: a Tutorial + Helpful Tips How to Block Your Knits: A Tutorial + Helpful Tips www.craftsy.com/blog/2013/05/blocking-knitting-tutorial/ Ashley Little May 4, 2013 Ever had a sweater — store-bought or handmade — that just loses its shape? The sleeves are hanging at different lengths, and hems that used to hit at the hips now hang like a crop top. What can you do? You have to reshape it. That’s what blocking is for. Whether you’re well-versed in knitting techniques or just finishing your first project, this tutorial will offer a step-by-step guide for how to block in knitting that will be useful to everyone. Finish your knitting projects Learn essential finishing techniques you can use to bring out the true beauty in any knitting project.Download for FREE What’s blocking? Knitted projects won’t come out perfect as soon as you bind off. You have to tell the stitches where to sit. That’s all blocking is. There’s a more thorough tutorial later on in this post, but the gist of blocking knits is this: To block any item, get it wet, wash the fibers and then lay it out on a flat surface. You could use an ironing board, a bed, blocking mats or something else. Then gently shape your project to be the dimensions you want. Let it dry, and the item will hold the shape you set. 1/9 Why block your knits? Chances are, you have a couple of lumps and bubbles, in addition to uneven lengths. Blocking can take care of that, too. Before you go crazy, don’t think that blocking will make up for the stitches you forgot to decrease or that little section where you went off-pattern. It’s hard to hide those mistakes. Blocking will simply reshape an item. What types of knits should be blocked? For some casual garments, like a one-piece sweater that is meant to be a wear-around-the- house type of item, perhaps blocking isn’t essential. But most knits will benefit from the shaping that blocking provides. To finish a knitting project you want to be relatively square, measure your dimensions as you lay out your project. If you aren’t having success, the likeliest problem is that your project isn’t wet enough. A lot of knitters block their individual pieces before seaming them together, especially for garments like sweaters. I’m going to admit it: I don’t do that. I sew the whole piece together, then I block it. I prefer this because it just makes life easier. I can do all the blocking at once and have a better idea of what it looks like as a finished piece. If this makes you nervous, you should go ahead and block them separately. Blocking tips for different fibers Only natural fibers like wool, alpaca, etc., generally benefit from blocking. For more delicate items like cashmere and acrylic, spritz blocking is recommended. For this, simply spray the item rather than soaking it and shape as desired. Acrylic yarn can be “killed” to create a softer, more limp fabric. By applying heat to the garment though steam blocking or ironing the fabric directly, the plastic fibers in the acrylic yarn essentially melt together. Once you’ve “killed” a garment, it cannot go back to its original shape, so make sure you decide wisely which acrylic pieces to use this technique on. Never try to block silk, as the fibers are far too delicate to withstand the heat. If you need a certain size or shape with silk, always create a gauge swatch first instead of relying on water and steam to help. Blocking tools Like most techniques, there are a ton of tools you can use to block. I don’t own many of these tools. For the most part, I substitute in other things I have around the house. When deciding whether to buy these tools below, just purchase what you think is best for your skill level. Will 2/9 you be blocking a lot? Can you substitute the tools? It all depends on your personal preferences. Blocking mats Blocking mats are awesome because they have grids on them that can help when you’re measuring and tugging at your blocked item. You can also get a special blocking board or foam mat that serves the same purpose. T-pins T-pins work well with foam blocking mats. You can push the pins in so they hold down whatever item you’re blocking and make sure it stays put. 3/9 Sock blockers I don’t knit socks often, but if I did, I’d probably buy sock blocks like these. They come in a range of sizes, so you don’t have to do much adjusting after you slip your sock on it. 4/9 Wool wash Part of blocking involves washing your knit. Make sure you use a mild shampoo. Baby shampoo works well, or you can buy special wool wash to use. How to block your knitting [Want to save or print this tutorial? Click here to download the PDF version, PLUS six enjoy bonus finishing tutorials — absolutely FREE!] I knitted my first sweater a few years ago. After every few wears, the rib at the bottom of the sweater starts to stretch out to the sides, making the sweater shorter and making my body look horrific in it. Here’s how I solved the shaping problem. What you’ll need: Sink or bucket large enough to hold your item Mild shampoo or wool wash 2 towels, one for rolling and another for blocking Measurements of your finished item, usually provided in the pattern Directions: 5/9 1. Fill a sink or bucket with lukewarm water. Never use hot water when soaking or rinsing natural fibers. Hot water and agitation are used to felt wool, so if you use either of those when you block, your stitches will start to stick together to form a solid piece of fabric. 2. Toss a little bit of the shampoo or wool wash in there and mix it all up. 3. Dip your knitted item (in my case, a sweater) into the water. Move it around just enough to make sure the entire item is wet, but don’t go nuts and dunk it in and out. Just like the hot water, agitation will make the natural fibers come together. Let the item hang out in the sink or bucket for about 5 minutes. 4. Begin the rinsing process: Drain the sink or bucket and refill it with cool water. Keep rinsing the item until the water is clear and without suds. 5. Grab one of the bath towels. Lay your item on the towel. No need to check exact measurements right now, but lay it out roughly the way you want it to look. You’ll get one more chance later to really adjust it. 6. Roll the item up in the towel. Squeeze the water out as you roll. If the item still feels drenched, you can repeat this step with another dry towel. 6/9 7. Grab one more bath towel. Lay the towel on a flat surface. 8. Check out the measurements from your pattern. If you’re making a garment like a sweater, you’ll want to be more exact than if you’re blocking, say, a blanket. Start to pull on your damp item, making sure it is laying flat and that all the measurements match those from the pattern. 7/9 9. Now’s the time to perfect the sweater. Adjust every angle, and then leave the sweater on the towel to dry. If the item doesn’t want to hold the shape, use straight pins to hold it in place. Once you’re happy with it, let it sit and dry. Drying time will vary depending on how large the item is, so just check back in a couple of hours. How to steam block Steam blocking is a gentle way to shape knit garments, blankets and scarves. Instead of soaking the garment in water and pinning it to air dry, you steam it, most commonly with a typical household iron. There are many benefits to steam blocking, including that you can shape your garment, fix or cover up small mistakes and set stitches to appear more evenly. The good news is that blocking is so easy, and there are two ways to do it: Method 1: 1. Pin your garment out to the desired dimensions, making sure the wrong side is facing up. 2. Wet an old pillowcase or thin towel and wring out the excess water so that it’s damp. Place it on top of the garment. 8/9 3. Use a household iron at its hottest setting and press down lightly, forcing the steam through the garment. Repeat this all over the garment until the pillow case is dry. Then let the garment dry for approximately 30 minutes. Method 2: Another way to steam block is to take the iron, put it on the steam setting, and hover it about an inch away from the garment. The goal is for the steam to go through the garment without ever touching the iron to the piece. Keep the iron moving along the length of the garment and then let it dry for 30 minutes or so. Pick the right yarn Love a pattern or technique but don’t know the best type of yarn to use? This guide has 17 pages of helpful information to create masterpieces!Download for FREE Learn even more with our free knitting mini classes! 9/9.
Recommended publications
  • Memoirs Faculty of Engineering
    ISSN 0078-6659 MEMOIRS OF THE FACULTY OF ENG THE FACULTY MEMOIRS OF MEMOIRS OF THE FACULTY OF ENGINEERING OSAKA CITY UNIVERSITY INEERING OSAKA CITY UNIVERSITY VOL. 60 DECEMBER 2019 VOL. 60. 2019 PUBLISHED BY THE GRADUATE SCHOOL OF ENGINEERING OSAKA CITY UNIVERSITY 1911-0402大阪市立大学 工学部 工学部英文紀要VOL.60(2019) 1-4 見本 スミ 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 This series of Memoirs is issued annually. Selected original works of the members 㻌 of the Faculty of Engineering are compiled in the first part of the volume. Abstracts of 㻌 㻌 papers presented elsewhere during the current year are compiled in the second part. List 㻌 of conference presentations delivered during the same period is appended in the last part. 㻌 All communications with respect to Memoirs should be addressed to: 㻌 Dean of the Graduate School of Engineering 㻌 Osaka City University 㻌 3-3-138, Sugimoto, Sumiyoshi-ku 㻌 Osaka 558-8585, Japan 㻌 㻌 Editors 㻌 㻌 㻌 Akira TERAI Hayato NAKATANI This is the final print issue of “Memoirs of the Faculty of Engineering, Osaka City Masafumi MURAJI University.” This series of Memoirs has been published for the last decade in print edition as Daisuke MIYAZAKI well as in electronic edition. From the next issue, the Memoirs will be published only Hideki AZUMA electronically. The forthcoming issues will be available at the internet address: Tetsu TOKUONO https://www.eng.osaka-cu.ac.jp/en/about/publication.html. The past and present editors take Toru ENDO this opportunity to express gratitude to the subscribers for all their support and hope them to keep interested in the Memoirs.
    [Show full text]
  • Blocking Knits 101 with Faith Hale
    Blocking Knits 101 with Faith Hale Chapter 1 - Blocking Knits 101 Overview - Hi there, I'm Faith. I'm a resident knitter here at Creativebug and I have been knitting for over 20 years. And one question you ask any knitter is whether or not they are a blocker. If they block their knitting. And the best ones always say yes. Blocking is one of those steps that can take a bit of time but it really lends polish to your finished garment. If you design your own knitwear, you'll want to block all of your swatches so that you can see how they'll behave when the piece is completed. In this class, we'll cover three different kinds of blocking, wet blocking, steam blocking, and spot blocking. And I'll share with you some tips for working with different kinds of yarns and different kinds of techniques. Blocking can feel a bit tedious, but it's also super meditative. And I love taking my time with it as the final step for knitwear that I'm planning myself or giving to someone else. (upbeat music) Materials - You'll need a blocking surface, which can be as simple as a bed or a piece of cardboard, but I really prefer these blocking mats. They're interlocking, you can get a budget version as kids play mats. They're made out of this foam and I really like that they break down and you can pack them up and put them away. But if you don't have access to these, you can use a guest bed or even your rug covered with a clean towel.
    [Show full text]
  • The Do-Gooder Donation Hat Knitting Pattern This Pattern Is Copyright Little Red Window Design 2016 and Is Intended for Personal Use Only
    the do-gooder Donation Hat knitting pattern This pattern is copyright Little Red Window Design 2016 and is intended for personal use only. Please do not distribute, reproduce or sell this pattern or sell items made from this pattern. You can find step by step photos at: littleredwindow.com/knitting-patterns The Do-Gooder Hat Free Knitting Pattern for Donations Sizes: 0-3 months (6 months, 12 -24 months, Child) Gauge: 16 stiches = 4 inches US 10 16" or 12" circular knitting needles US 10 double pointed needles Bulky weight yarn (I used Lion Brand Tonal, but I also love their Baby's First and Homespun yarns) Yarn needle Using a long-tail cast on, cast on 40 (48, 56, 64) stitches on your circular needles. Join to knit in the round and k1, p1 in a rib stitch for 5 rounds. Then knit all rounds until the hat is 4(4 1/2, 5, 5 1/2) inches long. Decrease (distribute stitches among 3 double pointed needles and knit with the 4th): Round 1: (k6, k2tog) and repeat to the end of the round. Round 2: Knit all stitches Round 3: (k5, k2tog) and repeat to the end of the round. Round 4: Knit all stitches Round 5: (k4, k2tog) and repeat to the end of the round. Round 6: Use the fourth double pointed needle to knit all stitches for one round. Round 7: (k3, k2tog) and repeat to the end of the round. Round 8: Knit all stitches to the end of the round Round 9: (k2, k2tog) and repeat to the end of the round.
    [Show full text]
  • 2591ES | 3391ES | 4191ES Scissor Lift
    Introduction. 1 Safety. 2 Safety Alert Symbols . 3 Fall Protection . 4 Electrocution Hazard . 5 Tip-over Hazards. 6 Fall Hazards . 7 Collision Hazards . 7 Additional Safety Hazards. 8 Battery Safety . 8 Jobsite Inspection . 9 Function Tests. 9 Operating Instructions . 10 Prestart. 10 Base Controls Operation and Test . 11 Platform Control Operation and Test . 12 Joystick Operation . 12 Outrigger Operation (optional). 15 Shutdown Procedure . 15 Emergency Systems. 16 Emergency Lowering – 2591ES – 3391ES . 16 Emergency Lowering – 4191ES. 16 Deck Extension . 17 Fold Down Platform Railings . 18 Machine Inspections and Maintenance . 20 Pre-Start Inspection Checklist . 21 Monthly Inspection Checklist . 22 Quarterly Inspection Checklist . 23 Maintenance . 25 Routine Maintenance . 26 Scheduled Maintenance . 26 ART_2849 Maintenance Lock . 26 Lubrication . 27 2591ES | 3391ES | 4191ES Battery Charger . 28 Component Locations. 30 Scissor Lift Warning and Instructional Decals . 34 2591ES Serial #11400001 – up Troubleshooting. 36 3391ES Serial #11500001 – up Transport and Lifting Instructions.. 38 4191ES Serial #11600001 – up Loading . 38 Lifting and Tie Down Instructions . 40 91831 December 2008 —Specifications— 2591ES 3391ES 4191ES Working Height* 31 FT* 9.62 m* 39 FT* 12.06 m* 47 FT* 14.50 m* Platform Height 25 FT 7.62 m 33 FT 10.06 m 41 FT 12.50 m Platform Entry Height 57 IN 1.45 m 66 IN 1.67 m 74 IN 1.88 m Stowed Height Rails Up 100.5 IN 2.55 m 109.5 IN 2.78 m 119 IN 3.02 m Rails Folded Down 71 IN 1.80 m 79 IN 2.01 m 87.5 IN 2.22 m Maximum Number
    [Show full text]
  • Low Spring Index Niti Coil Actuators for Use in Active Compression Garments
    Low Spring Index NiTi Coil Actuators for Use in Active Compression Garments The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Holschuh, Bradley, Edward Obropta, and Dava Newman. “Low Spring Index NiTi Coil Actuators for Use in Active Compression Garments.” IEEE/ASME Transactions on Mechatronics (2014): 1–14. As Published http://dx.doi.org/10.1109/TMECH.2014.2328519 Publisher Institute of Electrical and Electronics Engineers (IEEE) Version Author's final manuscript Citable link http://hdl.handle.net/1721.1/88470 Terms of Use Creative Commons Attribution-Noncommercial-Share Alike Detailed Terms http://creativecommons.org/licenses/by-nc-sa/4.0/ IEEE/ASME TRANSACTIONS ON MECHATRONICS 1 Low Spring Index NiTi Coil Actuators for Use in Active Compression Garments Bradley Holschuh, Edward Obropta, and Dava Newman Abstract—This paper describes the modeling, development, in astronauts [6] and for use in lightweight, full-body, high- and testing of low spring index nickel titanium (NiTi) coil mobility compression suits known as a mechanical counter- actuators designed for use in wearable compression garments, pressure (MCP) suits for future planetary exploration [7]–[11]. and presents a prototype tourniquet system using these actuators. NiTi coil actuators produce both large forces (>1 N) and large Compression garments typically take the form of either tight recoverable displacements (>100% length) that are well suited fitting elastic materials (in the case of [1]–[4], [7]–[11]) or as for compression garment design. Thermomechanical coil models an inflatable bladder system (in the case of [2], [6]). Both are presented that describe temperature and force as a function designs offer unique benefits and disadvantages.
    [Show full text]
  • Blocking of Hand Knits by Binka Schwan
    ON YOUR WAY TO THE MASTERS Blocking of Hand Knits by binka schwan Blocking is an important step in the knitting process. Unfortunately this very important step is often forgotten or neglected by the knitter. When knitters skip the blocking process they are often unhappy with their finished product. There are many definitions of blocking in knitting books, but most texts agree that the blocking process gives a knitted piece its permanent size and shape. The blocking process is an integral part of all three levels of the Master Hand Knitting Program. All knitted swatches and projects required for each level need to be blocked prior to submission. In addition, Level One requires a report on Blocking and Care of Hand Knits. 1 Either water or steam is used in the blocking process. Once the knitting of a garment is completed, blocking is done on each knitted piece prior to sewing together. Blocking will help adjust and reshape both length and width of pieces that are supposed to be identical. It will also even out the edges of individual pieces so that seaming together is easier. Seamless knitting (knitting in the round) can also be blocked to shape the stitches and smooth the rounds. Blocking after washing a garment will reshape it to the correct proportions. The blocking process allows the knitter to make certain that measurements stated in a pattern match the actual knitted pieces. This ensures a proper size and fit to the finished garment. A few tools are required for the blocking process. A method for getting the swatch/garment wet, a surface to block on, the original pattern, and a tape measure or yardstick to ensure correct 2 measurements are all necessary.
    [Show full text]
  • UNIVERSITY of CALIFORNIA, SAN DIEGO a Deficiency in The
    UNIVERSITY OF CALIFORNIA, SAN DIEGO A deficiency in the congenital tufting enteropathy gene, EpCAM, results in intestinal barrier and ion transport dysfunction A thesis submitted in partial satisfaction of the requirements for the degree Master of Science in Biology by Philip Andrew Kozan Committee in charge: Kim E. Barrett, Chair James Golden, Co-Chair Mamata Sivagnanam Ronald Marchelletta Randy Hampton 2014 Copyright Philip Andrew Kozan, 2014 All rights reserved. The Thesis of Philip Andrew Kozan is approved, and it is acceptable in quality and form for publication on microfilm and electronically: Co-Chair Chair University of California, San Diego 2014 iii Table of Contents Signature Page………………………………………………………………….. iii Table of Contents………………………………………………………….…… iv List of Figures………………………………………………………………….. v List of Tables…………………………………………………………………… vi Acknowledgements……………………………………………………………. vii Abstract of the Thesis………………………………………………………….. viii I. Introduction……………………………………………………………… 1 II. Material and Methods………………………………………………….. 8 III. Results…………………………………………………………………… 15 IV. Discussion……………………………………………………………….. 19 V. Figures……………………………………………………………………. 24 VI. Tables……………………………………………………………………... 31 References……………………………………………………………………….. 32 iv LIST OF FIGURES Fig 1: EpCAM in cell and murine models……………………………………… 24 Fig 2: Knockdown of EpCAM results in resistance and permeability defects 25 Fig 3: EpCAM shows changes in tight junction proteins…………………….. 26 Fig 4: Mutated EpCAM in mice causes barrier dysfunction…………………. 27 Fig 5: Knockdown of EpCAM decreases ion transport………………………. 28 Fig 6: Mutated EpCAM decreases ion transport in mice…………………….. 29 v LIST OF TABLES Table 1: List of Primers…………………………………………………………… 31 vi ACKNOWLEDGEMENTS I would like to acknowledge Dr. Kim Barrett for serving as chair of my committee. Her guidance and advice has helped in the completion and success of my project from the time I first began as a master’s student.
    [Show full text]
  • Introduction
    Introduction PAGE 1 INTRODUCTION TO THE SNOW-DROP THROW© Contents Materials ................................................................................................................................................. 3 Nurturing Fibres Eco-Fusion DK .......................................................................................................... 3 Gauge .................................................................................................................................................. 3 Yarn ..................................................................................................................................................... 3 Hook Size ............................................................................................................................................ 4 Difficulty .................................................................................................................................................. 4 Finished Size ............................................................................................................................................ 4 Abbreviations .......................................................................................................................................... 5 UK to USA Conversions ........................................................................................................................... 6 Blocking ..................................................................................................................................................
    [Show full text]
  • 4-H Textile Science Textile Arts Projects. INSTITUTION Pennsylvania State Univ., Univeriity Park
    DOCUMENT RESUME ED.379 510 CE 068 348 AUTHOR Scholl, Jan TITLE 4-H Textile Science Textile Arts Projects. INSTITUTION Pennsylvania State Univ., Univeriity Park. Cooperative Extension Service. PUB DATE 94 NOTE 24p.; For related documents, see CE 068 343-347. PUB TYPE Guides Classroom Use Instructional Materials (For Learner) (051) EDRS PRICE MF01/PC01 Plus Postage. DESCRIPTORS Clothing; Clothing Design; *Clothing Instruction; *Design Crafts; Elementary Secondary Education; Extracurricular Activities; Home Economics; *Home Management; *Learning Activities; *Student Organizations; Student Projects; *Textiles Instruction IDENTIFIERS *4 H Programs; Crocheting; Knitting; Weaving ABSTRACT This packet contains three 4-H textile arts projects for students in the textile sciences area. The projects cover weaving, knitting, and crocheting. Each project provides an overview of what the student will learn, what materials are needed, and suggested projects for the area. Projects can be adapted for beginning, intermediate, or advanced levels of skills. A step-by-step plan for doing the project, with instruction sheets and line drawings is included. Also included are a project record, ideas for sharing the project with others, and suggestions for additional projects. (KC) *********************************************************************** Reproductions supplied by EDRS are the best that can be made * from the original document. *********************************************************************** 4-H Textile Science Textile Arts Projects U S. DEPARTMENT OF EDUCATION Ofj Ice of Educational Research and Improvemont E r.1 CATIONAL RESOURCES INFORMATION "PERMISSION TO REPRODUCE THIS CENTER (ERIC) This document has been reproduced as MATERIAL HAS BEEN GRANTED BY received from the person or organization originating it. Minor changes have been made to improve reproduction quality. Points of view or opinions stated in this document do not necessarily represent official OERI position or policy.
    [Show full text]
  • Civil Society and the State in Democratic East Asia
    PROTEST AND SOCIAL MOVEMENTS Chiavacci, (eds) Grano & Obinger Civil Society and the State in Democratic East Asia East Democratic in State the and Society Civil Edited by David Chiavacci, Simona Grano, and Julia Obinger Civil Society and the State in Democratic East Asia Between Entanglement and Contention in Post High Growth Civil Society and the State in Democratic East Asia Protest and Social Movements Recent years have seen an explosion of protest movements around the world, and academic theories are racing to catch up with them. This series aims to further our understanding of the origins, dealings, decisions, and outcomes of social movements by fostering dialogue among many traditions of thought, across European nations and across continents. All theoretical perspectives are welcome. Books in the series typically combine theory with empirical research, dealing with various types of mobilization, from neighborhood groups to revolutions. We especially welcome work that synthesizes or compares different approaches to social movements, such as cultural and structural traditions, micro- and macro-social, economic and ideal, or qualitative and quantitative. Books in the series will be published in English. One goal is to encourage non- native speakers to introduce their work to Anglophone audiences. Another is to maximize accessibility: all books will be available in open access within a year after printed publication. Series Editors Jan Willem Duyvendak is professor of Sociology at the University of Amsterdam. James M. Jasper teaches at the Graduate Center of the City University of New York. Civil Society and the State in Democratic East Asia Between Entanglement and Contention in Post High Growth Edited by David Chiavacci, Simona Grano, and Julia Obinger Amsterdam University Press Published with the support of the Swiss National Science Foundation.
    [Show full text]
  • 1.1 Introductions of Denim Dyeing
    1.1 Introductions of denim dyeing 1.1.1 Background of Denim Fabric Denim, as shown in figure 1.1, is a rugged cotton twill textile, in which the weft passes under two or more warp fibers. It produces the recognizable diagonal ribbing characteristic on the fabric, which distinguishes denim from cotton duck. It is a twill-weave woven fabric that uses different colours for the warp and weft. One colour mainly used on the fabric surface is indigo blue. This produces an effect of surface dyeing. There are two types of denim fabric dyeing. They are indigo dyeing and sulphur dyeing. Indigo dyeing produces conventional blue colour and shade alike to blue colour. Sulphur dyeing, which also called colour denim is used to produce particular colours like black, cherry, grey, rust, mustard and lime, and also to get better the quality. Both of them are vat dyestuff. They are insoluble in water and have a very poor affinity to cellulose fibers like cotton fiber. In normal situation, vat dyes will not attach on cotton fiber. For dyeing of cotton yarn, vat dyes should be transformed into water-soluble form via chemical reduction process, in which hydrogen is liberated. The hydrogen reacts with the dye and allows a water molecule to attach to the dye. The dye is then transported into cotton fiber by the media of water. Sodium hydrosulfite with sodium hydroxide is one of the reducing agents used to convert the dye to its soluble form. The dye is attached onto cotton fiber by the water. These reduced dyes have to then be oxidized.
    [Show full text]
  • Evaluating Fire Blocking Performance of Barrier Fabrics
    FIRE AND MATERIALS Fire Mater. (2013) Published online in Wiley Online Library (wileyonlinelibrary.com). DOI: 10.1002/fam.2210 Evaluating fire blocking performance of barrier fabrics Shonali Nazaré*,†, William Pitts, Shaun Flynn, John. R. Shields and Rick D. Davis Fire Research Division, Engineering Laboratory, National Institute of Science and Technology, 100 Bureau Drive, MS-8665, Gaithersburg, MD 20899-8665, USA SUMMARY A series of evaluations were performed on different types of barrier fabrics (BFs) used in soft furnishings. Fundamental properties that influence the heat transfer characteristics of barrier material as it relates to thermal protection of cushioning components in upholstered products are discussed. This is important to enable a priori selection of BFs such that a final upholstered product complies with flammability regulations. Heat transfer measurements are used to determine effectiveness of materials to be used as barrier materials. A new bench-scale composite test method is also described to assess qualitative fire blocking performance of BFs. When tested for heat transfer characteristics, the area density and thickness of BFs show strong influence. However, when tested as a composite in a mock-up assembly, the BFs considered in this study showed a clear distinction between active and passive BFs. In the case of chemically active BFs, the construction parameters and material properties such as thickness, air permeability, and heat transfer were of little significance. In the case of passive BFs, however, these parameters became decisive. Results from this study suggest that if the BF is not an active fire barrier, then the amount of heat transferred through BF is critical.
    [Show full text]