Hemp Raw Material Research Articles

INFLUENCE OF GROWING CONDITIONS AND PRIMARY PROCESSING OF TECHNICAL HEMP ON ITS POLYMER COMPOSITION

The article proposes a methodology for experimental monitoring of a set of parameters of the chemical state of a biopolymer system of technical cannabis. Using sequential extraction techniques, the content of alpha-cellulose, pectin substances, hemicelluloses, acid insoluble lignin and other related compounds, including heavy metal ions, extraction substances, silicon oxide, in bast, bonfire and undirected hemp obtained from technical hemp trusts grown in Ivanovo Region, was determined. The influence of the soil factor on the biosynthesis of polymers and related substances of the bast and woody parts of the stem and on the destruction of plant tissues of hemp in the conditions of meadow vegetation has been traced. It has been established that the composition of hemp raw materials is influenced not only by the genetic nature of the plant, but also by the natural conditions of its cultivation and the peculiarities of the action of soil microflora in the processes of primary processing of the stem.

Promising areas for the use of industrial hemp for the manufacture of sheet building materials

The relevance of the study is to identify the potential for creating innovative building materials that can improve the quality and efficiency of construction and furniture production. The purpose of the study is to analyse the market of sheet building materials, explore the possibilities of using plant materials in construction and furniture industry, and compare the properties of the latest building materials with the existing ones. The analysis of literature sources included a search and evaluation of new developments in the construction industry, as well as an analysis of statistical data on the production of architectural materials in Ukraine, using information resources and Internet search services. To evaluate the consumer properties of innovative building materials, the author used quality assessment methods using visual perception and special tools, in accordance with the established regulatory documentation. Important issues aimed at using resource-saving technologies in construction and developing the latest (environmentally-friendly) building materials are considered. The current state of the Ukrainian market of building sheet materials and the properties of industrial hemp are investigated in order to determine the most cost-effective use of hemp raw materials as an effective basis for the creation of building materials for various purposes. The suitability of the raw materials was determined and assessed, experimental samples of chipboards with different fillers were obtained, and the physical, mechanical and aesthetic characteristics of the finished products were investigated. The research will contribute to the development of the hemp processing industry, as well as enterprises that produce goods for various functional purposes from hemp, which will provide conditions for combining the agricultural sector and the construction industry, i.e. building a closed production cycle

Study of Dyeing Process of Hemp/Cotton Fabrics by Using Natural Dyes Obtained from Rubia tinctorum L. and Calendula officialis.

The objective of this work was to assess the possibility of dyeing a substrate composed of non-textile industrial hemp using natural dyes from common madder (Rubia Tinctorum L.) and calendula (Calendula Officialis) and tannin and alum as mordants. The substrate used for the dyeing had a 25/75 hemp/cotton composition. The hemp raw material is an agricultural by-product that was subjected to mechanical and chemical treatments in order to cottonize the fibers, blend them with cotton, and thus obtain first 40-tex open-end yarns and then a knitted fabric. The latter was subjected to different dyeing conditions by varying the dye, mordant, and method for its application, type of water, and rinsing after dyeing. Measurements of the difference (ΔE) and intensity (K/S) of color and fastness to washing and rubbing were carried out. The results showed that dyeing of a non-textile residual hemp substrate is possible, and that calendula is a good option for dyeing it with tap water, tannin-alum set in a meta-mordanting process, and rinsing after 24 h. In this way, a contribution has been made to the circular economy of the textile industry through the use of more sustainable sources and products.

Simple Extraction of Cannabinoids from Female Inflorescences of Hemp (Cannabis sativa L.)

The high interest in non-psychoactive cannabidiol increases the need for efficient and straightforward cannabidiol (CBD) extraction methods. The research aimed to compare simple methods of cannabinoid extraction that do not require advanced laboratory equipment. This work assesses the content of total CBD and Δ9-tetrahydrocannabinol (Δ9-THC) in popular solvents such as water and ethanol extracts. Hemp raw material was analyzed with Gas Chromatography with a Flame Ionization Detector (GC-FID), while extracts were tested by High-Performance Liquid Chromatography (HPLC). The female inflorescences of three varieties of industrial hemp were tested: Futura 75, KC Dora, and Tygra (different sowing and N fertilization densities). Tygra (T/10/30) showed the highest content of CBD (0.064%) in water extracts. However, in 80% tincture from Futura 75 (F/30/30), a higher CBD content of 1.393% was observed. The use of 96% ethanol for extraction and ultrasound enabled the highest CBD content to be obtained: 2.682% in Futura 75 (F/30/30). Cold water extraction showed no effect on Δ9-THC content, while hot water extraction increased content from 0.001% in KC Dora to 0.002% in Futura 75 (F/30/30) and Tygra, but the changes were statistically insignificant. Application of 80% ethanol revealed the significantly highest content of Δ9-THC in KC Dora, from 0.026% (K/30/90) to 0.057% (K/30/30), as well as in Tygra (T/30/30) (0.036%) and Futura 75 (F/30/30) (0.048%). The use of ethanol extraction in combination with ultrasound could be an efficient method of obtaining cannabinoids.

Technological Changes in Wheat-Based Breads Enriched with Hemp Seed Press Cakes and Hemp Seed Grit.

Hemp and hemp seed press cake—a by-product of hemp oil production—are high-protein, gluten-free raw materials that are often used to enhance the nutritional value of breads. The addition of hemp materials, however, often negatively impacts the technological parameters of breads. Consequently, this study investigated whether and how much the addition of various by-products of hemp seed press cakes to wheat bread mixtures adversely affects the texture and colour profile. The texture profile and colour were determined using a texture analyser and tristimulus measurements. The particle size of raw materials was also measured. Principal component analysis was then used to visualise the correlation between all measured values as well as nutritional parameters. The results showed that the addition of only 1% of some hemp raw materials caused significant technological changes (p > 0.05). Hemp raw materials increased bread hardness and decreased elasticity. The colour of breads containing 1% hemp was also visibly darker than the reference bread. The addition of more hemp led to further darkening and the deterioration of the technological parameters of the products. Consequently, while various hemp materials have high nutritional value, a balance with sensory properties, e.g., textural and colour, has to be reached.

Hemp Fibre Properties and Processing Target Textile: A Review.

Over the last several decades, Cannabis sativa L. has become one of the most fashionable plants. To use the hemp potential for the development of a sustainable textile bio-product sector, it is necessary to learn about the effect of the processes creating hemp’s value chain on fibre properties. This review presents a multi-perspective approach to industrial hemp as a resource delivering textile fibres. This article extensively explores the current development of hemp fibre processes including methods of fibre extraction and processing and comprehensive fibre characteristics to indicate the challenges and opportunities regarding Cannabis sativa L. Presented statistics prove the increasing interest worldwide in hemp raw material and hemp-based bio-products. This article discusses the most relevant findings in terms of the effect of the retting processes on the composition of chemical fibres resulting in specific fibre properties. Methods of fibre extraction include dew retting, water retting, osmotic degumming, enzymatic retting, steam explosion and mechanical decortication to decompose pectin, lignin and hemicellulose to remove them from the stem with varying efficiency. This determines further processes and proves the diversity of ways to produce yarn by employing different spinning systems such as linen spinning, cotton and wool spinning technology with or without the use of the decortication process. The aim of this study is to provide knowledge for better understanding of the textile aspects of hemp fibres and their relationship to applied technological processes.

FEATURES OF THE PRIMARY PREPARATION OF HEMP STRAW STALKS SUITABLE FOR OBTAINING CELLULOSECONTAINING MATERIALS AND PAPER

The features of the primary preparation of hemp straw stalks suitable for obtaining cellulosecontaining materials and paper are considered in the article. The primary processes of the preparation of hemp raw materials for pulp production, which include harvesting, storage of straw stalks, transportation, and primary processing of raw materials suitable for obtaining cellulose-containing materials, are described. Methods of shortening stems and fibers applied in the pulping process are studied in detail. Technological methods of shortening straw stalks of technical hemp and cleaning raw materials from grains and garbage impurities are mentioned. The necessity of applying the processes of stalks crushing and wet purification of chopped straw stalks of technical hemp is proved.

Some issues of the modern regulatory and legal security of industrial hemp grawing

This article analyzes the international experience of forming a legislative framework in the field of hemp circulation. The primary source of its formation was the Single Convention on Narcotic Drugs (1961), which recognized hemp as a dangerous drug. However, it also states that it does not cover the use of hemp for obtaining fiber and seeds. In recent years, thanks to scientific and technical progress, both varieties of hemp, which are not capable of narcotic excitement, and the raw materials produced from them have been widely introduced in various areas of production. The rapid development of scientific thought and technologies necessitated the improvement of the legislative framework of the hemp industry. Activities with hemp are most fully and comprehensively regulated in the legislation of Canada, Great Britain and other countries. First of all, the term “industrial hemp” was used to denote drug-free varieties of hemp, which must be introduced into the domestic practice of hemp cultivation. In addition, a clear differentiation of requirements for activities with narcotic drugs, cannabis, and industrial hemp has been established at the legislative level, and an exhaustive list of controlled parts of the hemp plant is added to the term “cannabis.” Cultivation of industrial hemp is regulated by a separate law, which is removed from the scope of the laws on the circulation of narcotic drugs. It was determined that domestic legislation on the cultivation of industrial hemp intended for the production of fiber, seeds and the production of other products with a tetrahydrocannabinol content in the dry mass of no more than 0.08% should be based on the best international experience in this field and establish clear requirements for the areas of activity with hemp raw materials with a differentiated licensing system.

Bioactive Hemp Clothing Modified with Cannabidiol (CBD) Cannabis sativa L. Extract.

Hemp fiber variety, Bialobrzeskie, contains phenolic acids in its chemical composition giving it inherent antioxidant and antibacterial activity. The use of this raw material in fabric manufacture allows the creation of functional clothing with a positive effect on human skin. The aim of the study was to develop biologically active functional clothing made of pure industrial hemp raw materials, where cannabidiol (CBD) extract applied on the fabric surface strengthened the fiber bioactivity. The design of the clothing technology was focused on keeping the hemp inherent properties on a steady level and avoiding the use of chemicals in each stage of the value chain from plant cultivation up to garment manufacture. The research covered the evaluation of phenolic acids content and The Ferric Ion Reducing Antioxidant Power FRAP antioxidant activity of the hemp fabric. The hemp fabric enriched with CBD was used for clothing preparation. The human trials covered wearing of the clothing by 15 volunteers for six weeks and evaluation of hemp garment effect on human skin. The skin parameters were tested twice, before and after six weeks of clothing wearing, according to the own methodology that included measurements of skin biophysical properties including tests of skin moisture, transepidermal water loss, and sebum. Also, the effect of the active substances present on the fabrics on the in vitro culture of human keratinocytes was evaluated. Results of the research proved, that the wearing of developed functional hemp clothing with CBD extracts applied on the fabric surface was safe and caused improvement of skin condition, which can have an influence on slowing down of skin aging. The invention covering the pure hemp functional clothing with hybrid bioactivity resulting from the joined activity of fiber and cannabidiol was applied for a patent, Patent Application No: P.438388, 2021.

ДОСЛІДЖЕННЯ ВПЛИВУ ПРОЦЕСУ ЧЕСАННЯ НА ГЕОМЕТРИЧНІ ХАРАКТЕРИСТИКИ КОНОПЛЯНОГО ВОЛОКНА

The article analyzes the possibility of processing imported hemp raw materials to obtain household textiles using domestic technologies for processing best fibers. The choice of the carding process is justified as a mechanical effect on the geometric characteristics of hemp. A preliminary visual analysis of samples of hemp fibers, which is imported by a domestic enterprise in order to obtain yarn using a carded spinning system, has been carried out. As a result of the analysis of morphometric characteristics, it was found that the resulting fiber is hemp cottonin. The length and thickness of cottonin vary considerably. Such dimensional characteristics do not allow using it for the manufacture of household yarn. To further break down the complex hemp fibers and reduce their length, a carding process is applied. The study of the effect of the carding process was carried out while implementing five carding cycles on a laboratory fiber mixer, which is an imitation of the carding process on carding equipment in a production environment. After each carding cycle, a card canvas is formed, in which the fibers are evenly mixed and oriented in the longitudinal direction. Sizing of hemp fibers occurs after each carding cycle. According to the dimensional characteristics, staple and modal diagrams of the length distribution and diagrams of the diameter distribution of hemp fibers were constructed. It was found that as a result of the carding process, the average length and thickness of hemp fibers decreased significantly while maintaining the normalized breaking load. But at the same time, the proportion of long fibers remains and a rather high linear density of the fibers remains, which does not allow them to be processed into yarn using a carded spinning system. It is recommended that you continue with the mechanical processing process or use carded hemp fiber to make yarn using the machine’s wool spinning system.

Hemp raw materials: new perspectives for the food industry

The article discusses modern trends in growing and processing technologies for industrial hemp grown in Ukraine. The analysis of the normative and technical documentation governing the use of industrial hemp products in the food industry has been carried out. A comparative analysis of the fatty acid composition of various types of oil, including hemp oil, has been carried out. The special value of hemp oil for humans has been shown due to the content of polyunsaturated fatty acids and fat-soluble vitamins. Hemp oil is a rich and balanced source of linoleic (Omega-6), alpha-linolenic (Omega-3) fatty acids. The effects of these two polyunsaturated fatty acids on human health are anti-inflammatory, antithrombotic, antiarrhythmic and hypolipidemic properties. Hemp oil also contains significant amounts of tocopherols, which exhibit antioxidant activity. Ukrainian breeders have developed highly productive hemp varieties YUSO 31, Glyana, Victoria, Zoryana, Nika with a tetrahydrocannabinol content close to zero. The use of hemp seeds in the food industry is limited by poor performance in some functional indicators, therefore, a comparative analysis of processing methods developed to improve these properties was carried out. Typically, industrial hemp seeds are treated as a waste product and are used in most cases as animal feed. As a direct ingredient or food additive, hemp seeds, which are gluten-free, have only been used in recent years. In addition, the technology of manufacturing food products containing hemp raw materials is described. The article aims to summarize the chemical composition, nutritional value and potential health benefits of hemp seeds from in vitro and in vivo studies. Key words: hemp, oil, seeds, hemp protein, food industry.

Результаты сравнительного анализа линий переработки технической конопли, полученной по различным технологиям

The paper presents a comparative analysis of domestic lines for primary processing of industrial spring harvesting hemp that is taken either from rolls or from stems in order to obtain raw material. The indicators of the quality of hemp raw materials and the hemp fiber of the same type obtained from it have been analyzed. The characteristics of the same type hemp and the process of its primary processing have been obtained, without which it is impossible to plan the primary processing of industrial hemp.

Инновационные разработки и современные технические средства для уборки конопли посевной

Hemp growing is becoming a promising direction for the development of agriculture in Russia in the coming years due to the tasks of import substitution of cotton for domestic fiber from hemp and flax. The most important technological process in the cultivation of seeded hemp is its harvesting, which requires the use of specialized equipment and equipment due to the peculiarities of the structure of the stem and the significant height of the crops. The purpose of this work is to study the issue of technical equipment of domestic hemp growing and to find modern machines and technical solutions for hemp harvesting. Cannabis sativa L. is cultivated for seeds, fiber, and two-way use. Hence, various technologies are used for its harvesting. In our country, hemp harvesting equipment has not been produced for a long time; classic combines and general-purpose machines are used for harvesting crops. The technique used in hemp growing farms in Russia is considered. Combine harvesters such as PALESSE – GS12, ACROS – 585/595, Don – 1500B, etc., are adapted to collect hemp seeds; the flow of the process and high-quality threshing are ensured. However, an uncut stem with a height of 1.2 meters remains in the field. For harvesting crops for fiber (‘zelenets’), innovative machines have been developed based on domestic forage harvesters Don – 680M and RSMF – 2450 with a set of conversions for hemp. Field tests of prototypes have shown a positive result. Harvesters completely cut the stems, chop them into 50 cm lengths and put them in a swath, but do not comb them from green leaves and inflorescences. Based on the results of the work, a scheme of an innovative universal hemp harvester was proposed for harvesting sowing hemp in all directions of cultivation. Its application will fully mechanize the process of sowing hemp harvesting, collecting seeds and stems and obtaining high-quality hemp raw materials.

Industrial hemp for sustainable development

This article analyzes the potential for growing and processing of industrial hemp in accordance with the goals and objectives of sustainable development. Of the 17 sustainable development goals, they meet at least nine. Today it is a niche crop grown by small agricultural enterprises, and the organization on their basis of simple value chains for processing seeds and stems allows to diversify crop production, create new jobs and appropriate economic development of rural areas. The total costs for growing and processing hemp raw materials from 100 hectares of crops directly in the agricultural enterprise amount to UAH 5,7 million, and the income from the products produced by a simple value chain will amount to UAH 12,9 million. Industrial hemp seeds and products made from it are a valuable source of omega-3 and omega-6 polyunsaturated fatty acids in the optimal combination, so they serve as a basis for the development of the food industry for both regional and international markets. It is appropriate to involve the high nutritional potential of hemp seeds in the organization of a balanced diet, including children of different ages. The cannabinoid system of industrial hemp has a therapeutic and prophylactic effect on the human body, so the world community is actively involved in the raw materials of industrial hemp in the manufacture of biologically active additives and drugs. The development of this area in Ukraine requires appropriate changes in legislation. A hectare of industrial hemp is capable of forming more than 12 tons of dry biomass, containing up to 80 % of cellulose suitable for the production of various types of paper. The use of hemp in this direction contributes to the preservation of forests and is an effective measure to combat climate change and its consequences. Hemp is a traditional agricultural crop in Ukraine, the cultivation of which contributes to the conservation of biodiversity and agrobiocenoses. Their cultivation has a minimal environmental impact on the environment, and the processing of raw materials is characterized by waste-free production.

Analysis of Industrial Hemp Quality Indicators, a Line for Its Processing and Hemp Short

It is important to create foreign units alternative, introducing modern domestic technologies and lines in the framework of import substitution for the primary processing of strategic raw materials in the industrial hemp form. ( Research purpose ) To substantiate the technological scheme of the line for processing industrial hemp into the hemp short, the characteristics of raw materials and low-cost fibers for the primary processing of industrial hemp in the form of tangled mass of incomplete length stems, harvested by a specialized combine. ( Materials and methods ) Hemp rolls of spring harvesting were processed according to two options: single and double way of raw materials through the line, after which the hemp short quality indicators were determined. ( Results and discussion ) The authors found out that hemp raw material had broken and tangled stems 36-470 millimeters long, of high separability, with a fiber content of 26-30 percent, but with a small breaking load of 13-17 kilogram-forces. They determined that the fiber yield with a single way was 28-29 percent, with a double way – 23-22 percent. It was shown that a double pass reduced the mass fraction of shives by 3-4 percent in absolute terms and reduced the breaking load by no more than 2 kilogram-force. A low content of defects was revealed: the mass fraction of shives was no more than 7.1 percent, the absence of a “paw”. However, due to the minimum breaking load of the fiber, hemp was assigned to the lower grade. ( Conclusions ) The authors substantiated the scheme of small-sized and low-cost domestic line for the industrial hemp primary processing. They determined the quality indicators values of the hemp short and its output under various conditions of primary processing. The influence share of the second way through the line on the quality indicators was calculated: fiber yield – 97.3 percent; the breaking load of the twisted ribbon is 42.4 percent; mass fraction of shives – 75.3 percent; the average mass length is 61.2 percent; the weighted average linear density is 99.1 percent.

ТЕХНІКО-ТЕХНОЛОГІЧНІ РІШЕННЯ ПРОЦЕСУ ОДЕРЖАННЯ ВОЛОКНА З ЛУБ’ЯНИХ КУЛЬТУР

The paper is devoted to solving problems related to developing scientific bases for resource-saving technologies in bast crops complex processing. The work contains theoretical and experimental research in processing flax and hemp raw materials. The work objective is to find ways to improve the production conditions for processing bast fibre plants and to solve the problems of ameliorating the qualitative and quantitative bast fibre characteristics by improving the technological features of stem material processing and structural design application to the joint connections of the devices for processing bast-fibre raw materials. The paper also analyses current trends in the flax and hemp processing industry development, investigates the technical and technological features of processing bast-fibre crop stems and assesses the directions for increasing their processing efficiency.

Regulatory base of medical use of industrial hemp raw materials

In modern society, industrial hemp is increasingly associated as an agricultural crop of integrated use, which processes all components of the crop. Greening of production and introduction of innovative technologies rediscover to mankind the healing properties of hemp raw materials, including those based on cannabinoid compounds. Industrial hemp has more than 50 cannabinoid compounds and only tetrahydrocannabinol has a psychoactive effect on the human body, so its content is controlled by law in many countries. It remains unclear how to use other cannabinoid compounds and raw materials for their production – leaves and inflorescences. This article analyzes the regulatory framework for the medical use of raw hemp raw materials in different countries and suggests ways to improve it in Ukraine. In particular, a clear separation of the term "industrial hemp", which does not fall under the Law of Ukraine "On Narcotic Drugs, Psychotropic Substances and Precursors", the allocation of cultivation of industrial hemp in a separate licensed activity with a statement of comprehensive requirements for growing, harvesting and processing – all components stems, seeds, leaves, inflorescences, fiber.

INVESTIGATION OF HEMP WATER SORPTION CAPACITY / NATŪRALIŲ ORGANINIŲ KANAPIŲ SPALIŲ SORBENTO NAFTOS PRODUKTAMS ŠALINTI TYRIMAS

Effective clean-up of oil spills due to their negative environmental and economic impact is of capital importance. Clean-up of oil by sorption is considered one of the most desirable choices, because oil can be completely removed without causing any secondary pollution. Natural organic sorbents had been investigated and developed to control oil products‘ spills. Plant biomass is a renewable resource which can be converted into various materials and energy. Hemp (USO-31), as a textile industry waste, was used as an oil product sorbent material. The present study examines hemp sorption capacity of water using different fractions of hemp raw material to be used in oil/water mixtures. The experimental research revealed that water sorption capacity depends on fraction size and sorption time. The results of water sorption capacity of 2.5 and 5.0 mm after 1440 min were 4.74 and 4.67 g water/g dry sorbent, respectively. Labai svarbu efektyviai likviduoti išsiliejusius naftos produktus dėl jų neigiamo poveikio aplinkai ir ekonomikai. Naftos produktų valymo metodas pasitelkiant sorbentus yra laikomas vienu iš geriau­sių pasirinkimų, nes produktai yra absorbuojami sorbentų, nesukeliant jokios antrinės taršos. Natūralūs organiniai sorbentai buvo tiriami ir tobulinami, siekiant kontroliuoti naftos produktų išsiliejimus. Augalų biomasė yra atsinaujinantis išteklis, kuris gali būti naudojamas įvairioms medžiagoms ir energijai išgauti. Kanapių spaliai (USO-31), tekstilės pramonės atlieka, buvo tiriami kaip naftos produktų sorbentas. Buvo išnagrinėta kanapių vandens sorbcija naudojant įvairias šios medžiagos frakcijas. Eksperimentinis tyrimas parodė, kad vandens sorbcija priklauso nuo frakcijos dydžio ir sorbcijos laiko. Tyrimų metu buvo nustatyta vandens sorbcijos geba – 4,74 ir 4,67 g vandens/g sauso sorbento 2,5 ir 5,0 mm pavyzdžiams po 1440 min atitinkamai.

Thermal Conductivity of Hemp Based Boards

<p class="R-AbstractKeywords"><span lang="EN-US">Energy and raw material costs, an increase in environmental pollution, greenhouse gas emissions, global warming, depletion of fossil raw materials stimulate to seek and study alternatives to the synthetic fibers and products made of them for full or partial replacement. Renewable raw materials, including natural fiber sources, are the future of storage resources with a variety of positive effects on both the planet ecosystem and the living and working environment, and the energy consumption of delivering the required functionality. One of the most important energy-saving types is to reduce energy consumption in buildings by insulating them.</span></p><p class="R-AbstractKeywords"><span lang="EN-US">For Latvian conditions suitable crops are historically grown flax and hemp. Within the framework of the studies, hemp stems are being used. Hemp compared with flax, are less suffering from diseases and less damaged by pests, so hemp cultivation is practically free from use of chemical pesticides and herbicides reducing the risk to the ecosystem.</span></p><p class="R-AbstractKeywords"><span lang="EN-US">One of the most frequently mentioned industrial hemp raw materials positive qualities are their very wide use, practically all plant parts can be used in production of different products. This work explores the possibilities and technologies within the Latvian grown hemp stems to work into board materials with insulation capability.</span></p><p class="R-AbstractKeywords"><span lang="EN-US">Hemp fibers/shives mix boards can fulfill the main function of insulation materials, i.e., to reduce the transmission of heat, because they have a porous structure and low density. Material thermal insulation properties affect physical and structural properties of compounds. Cost effective particles board samples from chopped hemp stems with three types of adhesives and different thicknesses were produced and their thermal conductivity evaluated. The technologies applied and test results will be discussed in the paper. </span></p>

Evaluation of Hemp Root Bast as a New Material for Papermaking

Industrial hemp is a non-wood fiber material that can be used for papermaking due to a high yield of hemp raw material and high-quality physical properties of its pulp. Hemp is already used as a raw material for papermaking and other industrial productions. The chemical composition of hemp root bast (HRB) was analyzed. HRBs were pulped using a soda-anthraquinone (Soda-AQ) process and bleached with oxygen (O), chlorine dioxide (D), and alkali (E) using the bleaching sequence OD0ED1. The results showed that HRB can be a suitable raw material for papermaking; the HRB pulp had a high viscosity (893 mL g-1) and brightness (85.52% ISO-brightness).