Acoustic Performance of Sound Absorbing Materials Produced from Wool of Local Mountain Sheep

Lisbeth Løvbak Berg on 26. April 2022

Katarzyna Kobiela-Mendrek, Marcin Bączek, Jan Broda, Monika Rom, Ingvild Espelien and Ingun Klepp

Abstract

Wool of mountain sheep, treated nowadays as a waste or troublesome byproduct of sheep husbandry, was used for the production of sound-absorbing materials. Felts of two different thicknesses were produced from loose fibres. Additionally, two types of yarn,ring-spun and core rug, were obtained. The yarns were used for the production of tufted fabric with cut and loop piles. During the examinations, basic parameters of the obtained materials were determined. Then, according to standard procedure with the use of impedance tube, the sound absorption coefficient was measured, and the noise reduction coefficient (NRC) was calculated. It was revealed that felt produced from coarse wool exhibits high porosity, and its sound-absorbing capacity is strongly related to the felt thickness. For thicker felt the NRC achieved0.4, which is comparable with the NRC of commercial ceiling tiles. It was shown that the crucial parameter influencing the sound absorption of the tufted fabrics was the pile height. For both types of yarns, when the height of the pile was increased from 12 to 16 mm, the NRC increased from 0.4 to 0.42. The manufactured materials made from local wool possess good absorption capacity, similar to commercial products usually made from more expensive wool types. The materials look nice and can be used for noise reduction as inner acoustic screens, panels, or carpets.

Click here to read the full article (mdpi.com).

Local clothing: What is that? How an environmental policy concept is understood

ingridha on 1. April 2022

Ingun Grimstad Klepp, Vilde Haugrønning & Kirsi Laitala

The textile industry is characterized by global mass production and has an immense impact on the environment. One garment can travel around the world through an extensive value chain before reaching its final consumption destination. The consumer receives little information about how the item was produced due to a lack of policy regulation. In this article, we explore understandings of ‘local clothing’ and how the concept could be an alternative to the current clothing industry. The analysis is based on fifteen interviews with eighteen informants from Western Norway as part of the research project KRUS about Norwegian wool. Five ways of understanding local clothing were identified from the interviews: production, place-specific garments, local clothing habits, home-based production and local circulation. We lack a language with which to describe local clothing that covers local forms of production as an alternative to current clothing production. As such, the article highlights an important obstacle to reorganization: local clothing needs a vocabulary among the public, in politics and in the public sector in general, with which to describe the diverse production processes behind clothing and textiles and their material properties.

Click here to see the article (ingentaconnect.com)

Textile Cleaning and Odour Removal

ingridha on 18. March 2022

Kirsi Laitala, Ingun Grimstad Klepp & Vilde Haugrønning

Consumers’ textile care practices today are characterized by frequent laundering. The importance of the removal of odours has increased, especially the smell of sweat. This chapter summarizes knowledge about removing odour from textiles. It provides information on suitable cleaning methods for different textile fibres and types of soils. The considered cleaning methods include laundering, stain removal, airing, hand wash, and professional cleaning methods. The cleaning result from laundering depends on water, washing temperature, length of washing cycle, types and amounts of laundry chemicals, and mechanical agitation applied. Textile material and type of soil that needs removal will determine the right mix of these factors.

Inherent fibre properties affect the soiling characteristics of garments. Comparisons of odours retained in textiles have shown that wool has the least intensive odour, followed by cotton, and synthetic polyester and polyamide garments have the most intense odour. Most textiles can be washed with water and detergents, which are more efficient in the removal of many odorous soils than dry-cleaning, but low-temperature laundering and/or lack of chemical disinfectants such as bleaches can contribute to odour build-up in textiles and in the washing machine. These aspects contribute to the environmental impacts of textiles.

Book chapter in Odour in Textiles: Generation and Control (taylorfrancis.com).

The Consumer Perception of Odour

ingridha on 18. March 2022

Ingun Grimstad Klepp & Kirsi Laitala

Human olfaction sense is one of the highly underestimated senses since historical times. Fortunately, this has changed in recent times, as the perception of odour or scent by people has received increasing attention through several research works from different scientific disciplines. Our sense of smell and scent affects our lives more than previously assumed, influencing how we think, act, and behave. Odours both evoke and create memories. The perception of odours is also culturally and situationally dependent. However, there is still a lot that we don’t know about the influence of odour or scent on an individual’s characteristics and odour studies are hindered by the lack of vocabulary. The effect of pleasant odour on the shopping behaviours of customers is one highly researched area, while very few studies have focused on body odour perception. Most of the time body odour is related to self-hygiene and cleanliness, but understanding about the complete social aspects behind odour perception by humans is still at an infant stage. This chapter reviews the current status of consumer research on body odour and environmental odour or scent perception. The chapter also addresses the role of textile materials on body odour perception.

Click here to see the book chapter in Odour in Textiles: Generation and Control (taylorfrancis.com)

Woolume: Potential new products from vacant wool

Lisbeth Løvbak Berg on 26. January 2022

Anna Schytte Sigaard, Lisbeth Løvbak Berg and Ingun Grimstad Klepp

Summary

This report gives an overview of the market for alternative wool products with the perceived potential to be made using vacant wool. The work is based on a desktop study and interviews with manufacturers and distributors, focusing on products made of wool and their qualities. The report is the second deliverable from work package 2 of the WOOLUME project. The main goal of WOOLUME is to explore different ways of using wool from the Polish Mountain Sheep to achieve better utilisation of resources and value creation. Producers were identified that use wool as a material for products in the following categories: cultivation, soil improvement, insulation and personal hygiene as well as other new and alternative wool products. Findings show a range of products that take advantage of the many properties of wool, both aesthetic and technical. They also show that wool has the potential to replace synthetic materials in several applications and create truly circular products when treated in a way that preserves biodegradability. Though Merino wool dominates the wool market, several producers make use of other, local wool qualities and the interest for using the vacant wool, often discarded as a mere by-product of meat and dairy production, is growing. However, there is further potential for optimising resource utilisation in using vacant wool, in particular, non-spinnable wool with a higher fibre thickness, in products where the fineness and spinnability of merino wool are not required.

Click here to read the full report (oslomet.no).

Fossil Fashion: How Green Growth is Undermining the Circular Economy

Lisbeth Løvbak Berg on 24. October 2021

Why the fashion industry, driven by the green growth notion, cannot recycle its way out of the climate crisis

By Tone Skårdal Tobiasson

Tone is co-editor of “Local, Slow and Sustainable Fashion Fibres: Wool as a Fabric For Change”, from Palgrave Macmillan, out on December 18, 2021.

As the world comes to terms with the climate crisis and the environmental devastation of our over-consumption, we are increasingly being told that switching to greener products will not only save us, but be good for the economy. This is the principle behind “green growth”, which encourages us to continue consuming as long as the products we buy are more sustainable. But could it be that someone is pulling wool over our eyes?

The fashion industry has become one of the main culprits in the blaming-and-shaming for carbon-emissions, and numbers have been thrown around at a rate that rivals fast fashion. One of the most used statistics is that textiles in 2015 emitted 1.2 billion tons of carbon dioxide, equivalent or more than maritime shipping and international flights combined, a number that has since been challenged. However, the fashion industry is far from off the hook. 

Click here to read the full article (impakter.com).

Product lifetime in European and Norwegian policies

Lisbeth Løvbak Berg on 8. September 2021

Nina Heidenstrøm, Pål Strandbakken, Vilde Haugrønning and Kirsi Laitala

Abstract

The objective in this report is to better understand how the increased product lifetime option has been positioned in policies over
the past twenty years. By means of policy document analysis, we explore product lifetime positioning in the EU’s circular economy
policies, Norwegian political party programs and official documents, environmental NGO documents, consumer organisation policies
and product policies. Overall, we find little focus on product lifetime between 2000-2015, however, there has been a massive
increase over the past five years. There is still a long way to go in developing appropriate policy instruments to address product
lifetime.

Click here to find the full report (oda.oslomet.no).

WOOLUME: Mapping the market for acoustic and sound absorbing products made of wool

Lisbeth Løvbak Berg on 9. June 2021

Anna Schytte Sigaard and Vilde Haugrønning

Abstract

This report is the first deliverable from work package 2 of the WOOLUME project. The main goal of WOOLUME is to
explore different ways of using wool from Polish Mountain Sheep to achieve better utilisation of resources and value
creation. The aim of the report has been to map the market for acoustic and sound absorbing products made of wool to
examine the potential to introduce coarse wool as a material. This has been done through desktop research and
interviews with a focus on the qualities of wool as a natural product. Findings show that though man-made materials
dominate the market for acoustic products due to lower prices, wool is preferred as a material due to its natural
properties as well as aesthetics. Producers using wool consider their products to be high-end, intended for people who
want very good quality products and who are willing to pay a higher price to achieve this. However, few producers use
coarse wool in these products, and many are made of pure Merino wool. Using Merino wool which is often considered
of very fine quality due to the low micron-count does not correspond with the ideal of good utilisation of resources.
Therefore, we are proposing to utilise coarse wool which today is discarded as a mere by-product to meat-production.
Merino could instead be used for products where fineness and softness are important factors such as for clothing. In
addition, we argue for the rawness and uniqueness of the look of coarse wool as positive in terms of aesthetics and as
something that adds to the position of acoustic products made of wool as high-end.

Click here to read the full report (oda.oslomet.no).

Durable or cheap? Parents’ acquisition of children’s clothing

ingridha on 28. May 2021

Ingun Grimstad Klepp & Vilde Haugrønning

Abstract

Parents are faced with a plurality of choices and concerns when it comes to the acquisition of clothing for their children. This paper explores how parents employ longevity in consumption of children’s clothing from a practice-oriented perspective. The material consists of 6 focus groups with 40 parents who have at least one child under the age of 18. The aim of the groups was to establish children’s clothing needs: how many they need of each garment, how long parents expect the garment to last and what they understand as quality in clothing.

The analysis shows that parents mainly opt for an ‘one or the other’ strategy; they choose what they understand as quality, often affiliated with specific brands, and accept paying more for the garment, or they mainly choose based on low prices, and expect less of the garment. Quality is evaluated based on the garments’ durability and function. More specifically, the parents measure the service lifetime of a garment based on the number of seasons it lasts, either in terms of wear and tear or the child growing out of it. The expected lifetime is defined by uncertain sources, from their own and friends’ experiences, and their desire to justify their own choices as well as routinised practices.

Our discussion section employs these findings and contextualise them within product lifetime discourses. By doing this, we provide knowledge about how quality is understood, and how brand and price are used as indicators. We show how lack of information about products, especially on garments, leads to uninformed consumption practices that have consequences for how quality and longevity are prioritised and understood.

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Consumer practices for extending the social lifetimes of sofas and clothing

ingridha on 27. May 2021

Vilde Haugrønning, Kirsi Laitala & Ingun Grimstad Klepp

Abstract

Consumers play an essential role in efforts to extend product lifetimes (PL) and consumers’ practices can determine how long and active lives products get. Applying the framework of Social Practice Theory, this paper argues that in order to suggest changes to how consumers can contribute to longer product lifespans, research needs to focus on consumer practices. The data material consists of 4 focus group interviews with 38 participants about household goods and 29 semi-structured interviews about clothing.

Previous research shows that consumers’ expectations of product lifetime has decreased, while satisfaction with products is relatively high, which may indicate that product break down and/or replacement is more accepted. Therefore, we argue, it is necessary to focus on social lifespans. Our findings show that products such as clothing and sofas often go out of use or are disposed of before their physical lifespan ends, and it is more common to donate or sell old clothing and sofas than buying the products second hand. There are a number of routinised practices, such as disposal of functional items, that are considered normal, which leads to less reflexivity of seemingly unsustainable practices.

The material in products, or the expectation to the material, is highly influential for practices that can extend the social lifespan, such as maintenance. We conclude that by understanding practices as integrated and influenced by elements of the material, social and cultural, policy interventions may have a greater impact on the social lifespan of products.

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