Yrjö Nuutinen

Natural Resources Institute Finland (Luke) · Natural resources and bioproduction

Biomass derived from small-diameter, dense, thinning stands is largely underutilized within the European Union, mainly because of in-effective harvesting methods and cutting technology, leading to high supply costs. Therefore, the efficacy of boom-corridor thinning (BCT) and selective thinning (ST) on harvester felling and bunching productivity was...

Young, dense forest in Finland and Sweden urgently need to receive first thinning. In such stands, conventional selective thinning methods make the harvester work time consuming and, thus, costly. To make small-sized trees economically competitive as raw material for bioenergy and biorefining, new harvesting technologies and/or thinning methods nee...

According to National Forest Inventory data, there is an urgent need for tending seedling stands of at least 700,000 ha and a need for 1 million ha in the next few years in Finland. The motivation for forest owners to conduct pre-commercial silvicultural operations is low due to the associated high costs. Especially the costs of tending and clearin...

Different abiotic and biotic disturbances are expected to become more common in the future due to a warming climate. Globally, post-disturbance salvage logging is becoming more predominant to recover economic value from timber in disturbed forests. This study collected comparative time-study data and analyzed the productivity of cutting for windfal...

Bundling small-diameter trees from thinnings has become a viable technology with the development of the Fixteri harvester-bundler. Several studies have measured the productivity of the machine, however, bundling also influences the whole supply chain. A study was conducted to investigate the quality of chips and productivity of five different conve...

The objective of the study was to improve knowledge on effects of harvested tree size and density of undergrowth on the operational efficiency of a bundle-harvester that produces 2.6 m long bundles, with ca. 60–70 cm diameter, in early fuel wood thinnings. In total 26 time study plots were marked out in 30 to 35 year old Scots pine dominated stands...

First thinnings are often neglected in Europe due to high harvesting costs. The studied small-tree bundler (Fixteri FX15a) was developed in order to rationalize the integrated harvesting of small-diameter energy wood and pulpwood in thinning operations, and to reduce transportation costs through load compaction. For the time-and-motion study, three...

Tutkimuksessa selvitettiin puun hakkuuta voimakkaan matalapainemyrskyn jäljiltä. Tutkimuksessa myrskytuhopuulla hakkuun tuottavuus laski 20–35 %. Kuljettajalla on iso vaikutus myrskytuhopuun hakkuun tuottavuuteen. Eino-ja Seija-myrskyjen jäljiltä korjatun puun laskennalliset korjuukustannukset kasvoivat 14–41 %, mikä on selvästi vähemmät kuin aiemm...

During the 2000's, several powerful storms have caused disastrous damage for Finnish forests. There were no studies of windfall salvaging after big storms in Finland. Therefore, a time study of the cutting productivity of windfalls was conducted. The comparative time-study data was collected in December 2013 after the Eino and Seija storms. When cu...

Bundling small-diameter trees from thinnings has become a viable technology with the development of the Fixteri harvester-bundler. Several studies have measured the productivity of the machine itself, however, bundles themselves also influence the supply chain. A study was conducted to investigate the quality and productivity of five different chip...

Impurities in harvested stumps are a quality problem because high levels of mineral contaminants decrease the effective heating value of the stump wood, and can also affect ash melting behaviour during combustion, leading to sintering and drift problems. The aim of this case study was to clarify the productivity and screening efficiency of the Komp...

This study defined the productivity levels of a CBI 5800 grinder using a truck as a base machine for processing stumps, logging residues and whole trees at a roadside landing. For defining the solid content of the truck loads, the weight of each load was recorded. Furthermore, samples from each load were collected in order to define the moisture co...

Fixteri FX15a -kokopuupaalaimen tuottavuustutkimus toteutettiin maaliskuussa 2013 Jyväskylän ympäristössä kolmella puustoltaan erilaisella mäntyvaltaisella kuviolla. Kaksi kuvioista oli energiapuukorjuukohteita. Ensimmäisellä energiapuukuviolla oli tiheä hakkuuta haittaava alikasvos, jossa poistettavien kokopuiden keskikoko oli 27 dm3. Toiselta ene...

The aim of this case study was to clarify the productivity and cost of a system based on bun- dling logging residues at the roadside landing with the forwarder-mounted logging residue bundler. In order to find the bundling productivity, a set of time studies was carried out, in which several working techniques were tested and evaluated. The cost-ef...

Pienpuuhakkeen tuotannon kustannustekijät ja toimituslogistiikka

The objective of the present study was to develop an automatic time study method based on a process–data model for single-grip harvesters, with inputs based on data automatically collected by the harvester's onboard computer. The method integrates the phases of the work cycle into components under conditions in which the work phases may overlap to...

Studien av klenträdsbuntaren Fixteri FX15a utfördes våren 2013 i mellersta Finland. Maskinen studerades i tre talldominerade provbestånd; ett klent, tätt konfliktbestånd med riklig underväxt och ett likartat konfliktbestånd, men utan underväxt samt i en mera normal förstagallring. Medelstamvolymen i uttaget var 27,44 respektive 84 dm3. Gallringsing...

To date, investigations of harvester work have relied on the time study method, which is the most common work measurement technique for work studies. Time studies are often used as a basis for arriving at important conclusions or using certain technologies or working methods in harvester operations wherein the most important focus is to understand...

First thinnings have been neglected to great extent in Finland because of high harvesting costs. The whole-tree bundler (Fixteri) was developed in order to rationalize the integrated harvesting of small-diameter energy wood and pulpwood and to reduce transportation costs through load compaction. The operation of the whole-tree bundler is composed o...

In mechanical cutting, deep damage caused by feed rollers can reduce the yield of good quality timber for the sawmill and plywood industries. Additionally the feeding and energy efficiency of feed rollers are important for the profitability of harvester cutting. The objectives of this study were to compare the damages to sawlogs, as well as the tim...

The aim of the study was to investigate the effect of work experience on the accuracy and variation of observers recording the operation time of a harvester. A simulated thinning operation using a harvester, shown as video via a television screen in laboratory conditions, was observed by 20 inexperienced students and 10 experienced work study resea...

This paper examines the forwarding productivity of energy wood thinnings. The objectives of the study were to: compare the forwarding productivity following either manual or mechanized felling of whole trees and create productivity models for forwarding. The time consumption of the work phases in forwarding, following manual and mechanized cutting...

This paper examines the forwarding productivity of energy wood thinnings. The objectives of the study were to: compare the forwarding productivity following either manual or mechanized felling of whole trees and create productivity models for forwarding. The time consumption of the work phases in forwarding, following manual and mechanized cutting...

In the CTL-harvesting method stems are bucked and cut into several timber assortments at the harvesting site by a single grip harvester. During cutting, the harvester operator can directly affect the efficiency of forwarding. Harvester and forwarder have different productivities and variations in stem size have a larger effect on the harvester than...