Articles containing the keyword 'mechanization'
Category : Article
Alongside the extent of forest production, the demand for labour input in forestry depends on the development of the structure of production and of the productivity of the work. In this, mechanization of harvesting will have long-lasting influence. Despite the growth in forestry production, the number of forestry workers has decreased considerably in many countries, but at the same time the share of professional forest workers has increased. The permanence of work fundamentally affects the life of a forest worker. It has influence on the income level, on the social position of the worker and on the standard of living.
The appreciation of the occupation of a forest worker will be increased mainly within the increasing mechanization of the work. It requires vocational training, and it will improve wages, competition of skilled workers and social appreciation of the vocation. In order to influence their benefits forest workers have organized themselves into trade unions. They activate their members in to helping the unions to attain their aims. Trade unions try to influence the policies of forestry and forest labour. In this respect they are in contact with political parties. The questions of labour policy occupy a central position in the mutual relations of the labour market organizations. Within mutual cooperation much promotion has been achieved concerning wages, working conditions, rationalization, improvement of housing facilities and other living conditions. Especially in some East-European countries attention is being paid to the motivation of forest workers.
The PDF includes a summary in Finnish.
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Kantola,
E-mail:
mk@mm.unknown
According to the available literature, the times when pulpwood limbing was made by axe and barking by hand tools, barking either had no effect on the pile density (if limbing quality was good) or increased pile density (if limbing was bad). When rotary barking machines are used, the branch stumps remain intact during barking. Therefore, if there are branch stumps in the pulpwood, barking decreases the pile density. Nowadays, when power saw limbing is a common practice in Finland, barking presumably greatly decreases the pile density, due to the fact that in power saw limbing branch stumps are numerous and high. Therefore, the method to estimate the solid volume of a pile of unbarked pulpwood are not applicable to barked pulpwood without modification.
The PDF includes a summary in English.
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Kärkkäinen,
E-mail:
mk@mm.unknown
A theoretical nomogram was made for estimating the costs of fully mechanized thinning and the driving speed of the machine. Based on this nomogram and the previous studies three harvesting methods were compared; systematic fully mechanized harvesting, selective fully mechanized harvesting, and manual felling combined with whole-tree chipping.
The third method was cheaper than the fully mechanized methods in a pole-stage stand. The choice of the most advantageous chipping station depended on conditions, but the smaller tree size and possibly the reduced damage on the remaining stand favour chipping on the strip road rather than chipping on the intermediate landing or at the mill.
Mechanized systematic thinning was the cheapest method for harvesting in the sapling stand. The required driving speed were so low that ergonomic factors should not hinder its use. Factors related to the future production of the stand do, however, limit its use. Mechanized selective thinning does not seem to be an economic method for harvesting in a sapling or pole-stage stand.
The PDF includes a summary in English.
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Harstela,
E-mail:
ph@mm.unknown
- Tervo, E-mail: lt@mm.unknown
During the next decade there will be a marked increase in the allowable cut in drained peatlands. At the same time, the mechanization in logging proceeds, and in short-distance haulage the use of forwarders will increase. This study, based on literature and some observations, deals with logging conditions in drained peatlands with special reference to the suitability of heavy logging machines for use in such terrain. In addition, soil frost and the bearing capacity of the frozen peat soil were studied.
Freezing of the soil in a drained peatland area depends prevailingly on the weather conditions during early winter. The factors influencing soil freezing of a drained peatland are completely different from those regulating the freezing of natural peat soils. The frost penetrates in general deeper in the drained than virgin peatland. The topmost peat layer does not, however, freeze uniformly. Generally speaking, the bearing capacity of a drained peat soil is lower than that of undrained peat due to lower water content.
It is concluded that heavy logging machines are probably not fitted for use in drained areas on peatland even if the average soil frost values recorded would suggest it. Moreover, because of their extremely superficial root systems, peatland forests are exposed to damages by heavy machines in thinning operations.
The PDF includes a summary in English.
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Hannelius,
E-mail:
sh@mm.unknown
In this study a formula has been developed to describe the influence of the change of cost level on such a mechanization prognosis, where is assumed that wages and machine costs bear compound interest. In the study there are some numerical examples.
In the formula p1 = annual per cent increase of wages, p3 = annual per cent increase of machine costs, p2 = sudden and incident per cent increase of machine costs, and tv = delay in the profitability of mechanization.
The PDF includes a summary in English.
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Harstela,
E-mail:
ph@mm.unknown
In 1957 the annual cuttings in Finland were 40.2 million m3 without bark. The aim of the study was to estimate the rate of mechanization of harvesting of timber in Finland, and make a prediction of the state of mechanization by 1972. According to the study, harvesting and transportation of the felling volume in 1957 would have required about 25.5 million working hours. Mechanization of forest work has decreased it only by 0.32 million working hours. The profitability of forest work has improved in 1950s, which is mainly due to changes in harvesting, such as shifting to longer lengths of pulpwood and props and cutting unbarked timber.
The study predicts that in 1972 it will take 14.8 million working hours to harvest and 5.4 million working hours to transport a corresponding felling volume as in 1957. However, a new way of producing timber or a working method of wood may change the picture completely. Reduction in harvesting expenses through mechanization may lead to diminishing the minimum diameter of logs, which affects profitability of work. It is also probable that mechanization of wood transportation will lead to working sites with longer distances of forest transportation. Also, industry using wood as raw material will also obviously expand.
The article includes a summary in English.
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Putkisto,
E-mail:
kp@mm.unknown
The aim of the study was to compare the newly introduced brush cutter to ordinary hand tools in clearing of cutting areas and thinning young birch (Betula sp.) and Scots pine (Pinus Sylvestris L.) stands. Working with a prototype of the brush cutter, Brushmaster, reduced the total working time by 15-20% compared to bush knife and axe, in spite of the cutter’s weight. At rainy weather the advantage of Brushmaster dissapeared because of clogging of the cutter’s air filter. The prototype proved to be more effective when clearing a cutting area, and hand tools seemed to be faster if damage to the remaining trees have to be avoided.
In addition, eight either lighter or more effective motor saws or brush cutters were compared mutually, and the effect of motor effect, weight, handiness, arrangement of suspenders and handles is discussed. With these improved types of the cutter it was possible to shorten the total working time in thinning of stands (mostly clearing of young stands) to 30-40% of the total working time compared to hand tools. The most modern saws appeared to be best adapted in clearing cutting areas.
The article includes an abstract in English.
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Sirén,
E-mail:
gs@mm.unknown
Forest work is physically hard. However, there are ways to make the work less damaging with right practices and utilization of machines. The article firstly presents the legal and silvicultural requirements for forest work. Then the ways to organize the work and machines used as well as the practical implications are discussed. Different work phases such as felling, skidding and transportation of timber are presented.
The PDG contains a summary in German.
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Stentzel,
E-mail:
es@mm.unknown
When ditches are dug in forest drainage, smaller stones are removed by hand, but the larger ones require the use of explosives or stone lifting machinery. Use of explosives have been a more common method for the larger stones. Due to development of detonation methods, it has also been used for smaller stones than earlier.
The investigation was a time study comparing five different stone lifting machines. Time needed for different stages of the work was measured. The stages lasted approximately as long for all of the machines. However, the effectivity of the machines could not be determined, because the stones removed were not similar enough. Stone lifting machine Pekka appeared slightly more effective than the other four machines. It was also easy to assemble, disassemble and move.
The article includes a summary in German.
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Yli-Vakkuri,
E-mail:
py@mm.unknown
Silva Fennica Issue 80 includes presentations held in 1952 in the 7th professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
Soil preparation improves formation of seedlings in natural regeneration sites. This presentation describes mechanization of the work using four different machines. According to the study, the effectiveness and quality of the work has improved compared to the earlier machines, and the method is becoming a competitive alternative to slash burning.
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Hautamäki,
E-mail:
th@mm.unknown
Silva Fennica Issue 69 includes presentations held in 1948-1950 in the fourth professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
This presentation describes the development of forest haulage and long-distance transportation of timber. The article gives examples of improving the effectivity of horse hauling, use of tractors, loading of timber and floating, and gives examples of new equipment used in timber transport.
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Kantola,
E-mail:
mk@mm.unknown
Silva Fennica Issue 69 includes presentations held in 1948-1950 in the fourth professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
This presentation describes the work and methods of rationalizing forest work and forest management, and the organizations doing work studies. Examples of means to improve the effectivity of practical work are described.
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Vöry,
E-mail:
jv@mm.unknown
Silva Fennica Issue 69 includes presentations held in 1948-1950 in the fourth professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.
This presentation discusses opportunities to increase the use of working machines, such as tractors, in construction of roads and floating channels, which have been little used in Finland. The presentation summarizes the machines available and their use based on experiences in Sweden.
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Koskenmaa,
E-mail:
ek@mm.unknown
Category : Article
The purpose of this study is to reveal the links between farm forestry and its economic and social environment. The second-stage factor analysis used was based on factor scores per municipality, representing the dimensions of total farm operation and of its economic and social environment. The population was 17 municipalities or groups of municipalities in the South Karelian Forest Board district.
The conclusions of the results are directly applicable only to the ideal types presented. A socio-economic environment marked by industrialization detrimentally affects both the standard of forest management, as assessed subjectively by field workers, and the productivity of logging, as measured by labour input/m3 of output. This finding holds good even despite the modernization of forest management indicated by the adoption of renewal cuts.
The clearest negative factor for forestry is the irrational distribution of forest holdings. This impedes the rationalization of forest management and the efficiency of loggings. Extensive scattering of forest holdings also delays the mechanization of logging. The spread effects of industrialization relate to a higher level of forest management and labour productivity of logging. Family farming links up closest with features that enhance the importance of the forest to the farmer. Such features include regularity and size of delivery cuts.
Centralized agriculture, mainly village settlement areas, displayed the poorest forest management. Problem farms are typified by small farm units, unemployment and a low degree of forest management.
The PDF includes a summary in English.
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Hahtola,
E-mail:
kh@mm.unknown
The study links up with the general development of logging on private farm woodlots, practiced by the Work Efficiency Institute (Työtehoseura). It is based on the idea that the promotion of forest management on farms should be integrated with general agricultural development. The aim of the study was to find out the relation between delivery cuts and management of the farm as a whole, including economic and social environment. The first, methodological part develops a model representing farming, based on factor analysis. The second part tests the applicability of the factor analysis in the light of the empirical data, and studies the relation between delivery cuts and total farming and regional differences in farming.
Despite the descriptive nature of the factors obtained, the solution permitted a multi-dimensional examination. It seems that certain aspects typical to scattered settlement accentuate the importance of the forest for the farm. These include a high ratio of forest to arable land, barren soil and forest holdings that form unbroken tract of land. The importance of forestry is accentuated by the self-sufficiency of farms in labour and tractive power. On the other hand, there were lines of production and forms of livelihood and land utilization that compete with forestry, such as off-farm employment and alternative forms of land-use. One factor indicative for small importance of forestry for the farms was the small size in ratio to arable land. Often money for machinery has come from forest revenues.
The factor analysis indicate that a rational parcelling of forest holdings leads to better cutting methods. Also, cutting method improve and the proportion of renewal cuttings increase on moving from remote areas towards population centers. Productivity of delivery cuts is affected by the total employment of labour and tractive power on the farm. Abundance of labour and the use of farm’s own labour are probably detrimental to the productivity of delivery cuts. When the farms grow, the increase in the quantity felled and the rise in the degree of mechanization favour productivity.
The PDF includes a summary in English.
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Hahtola,
E-mail:
kh@mm.unknown
Forest transport of timber in Finland has been arranged as horse haulage during winter time using horses vacant from farm work. Tractors have now begun to replace horses in agriculture, which will lead to shortage of horses for timber harvesting in future. The aim of this investigation was to find a method of mechanized forest transport suitable for Finnish conditions. The method should be provided by an agricultural wheel tractor that is shared with agriculture. It should also be applicable to timber transport of relatively small forest holdings.
A method for time studies of tractor driven timber harvesting was developed. The competitivity of tractor transport of timber against the traditional method was studied in four pulpwood harvesting sites. The results suggest that if the tractor forest transport method in question is to be applied in practice, conditions should first be chosen which favour it most. A tractor forest transport method evolved on the basis of experiments presupposes certain conditions to be successful. These include snow for the construction of the packed-snow driveway, frost to harden the driveway, the location of strip roads in relatively easy topography, and of the main haulage road that is gently sloping in the haulage-loaded direction. The optimal transport distance for this method are about 3-10 km.
The PDF includes a summary in English.
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Putkisto,
E-mail:
kp@mm.unknown
Due to the high level of salaries and cost of social security, strict ergonomic standards, specific logging conditions, predominance of private ownership, and strong influence of environmental and conservation aspects, the Nordic countries have been forced to develop completely new logging technology to meet their own specific requirements. Demanding domestic markets have created a strong base for the production and export of forest machines. In the 1980’s Finland has become the leading manufacturer of logging machinery in Europe.
The Finnish logging technology rests typically on the log-length method and the use of load-carrying forwarders. This constrains the export of logging machinery in many countries, but as increasing emphasis is placed on thinnings, improved timber recovery, productivity, ergonomics, and protection of environment, increasing interest is shown in this technology.
The paper presents a synthesis of logging in Finland. The technical logging conditions, development of mechanization, present technology, productivity of work, and forest machine industry are explained and reviewed from the view point of a foreign reader.
The PDF includes a summary in Finnish.
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Hakkila,
E-mail:
ph@mm.unknown
The paper is the final report of the Inter-Nordic Terrain-machine Project (1972–1975). It deals with the requirements for a terrain classification for forestry, its factors and classes, and presents a terrain classification.
The mechanization of hauling, which took place in the field of forestry in the 1950's, added to the need for a terrain classification. Different terrain classifications based on different terrain factors have been developed in many countries. In the meeting of IUFRO Section 32 held in Montreal in 1964, it was found that a general system was needed for measuring and describing those terrain conditions having a significant influence on forest operations. The requirements for such a classification system are given in the paper. Because some of the requirements are contradictory, the classification must be a compromise. The most important factors from the forestry point of view are presented in the article.
The terrain classification presented in this report consists of two stages. The first stage is a primary terrain classification, in which terrain factors are measured or described objectively. The second is a secondary descriptive classification. Only factors essential to the activity in question are taken into account. After this, in a secondary functional stage, the requirements of the employer of the system, e.g., working method, machines etc., are also taken into account.
The PDF includes a summary in Finnish.
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Eriksson,
E-mail:
te@mm.unknown
- Nilsson, E-mail: gn@mm.unknown
- Skråmo, E-mail: gs@mm.unknown
Category : Research article
The poor cost-effectiveness of mechanized planting (MECP) is the main reason for the low mechanization rate of planting. In this study, we investigated the productivity of the mechanized excavator-based planting of Norway spruce (Picea abies [L.] H. Karst.) seedlings based on data collected by the Risutec Asta documentation system. We also compared the costs of a MECP chain with two different manual planting (MAP) chains, where mounding was carried out by a crawler excavator (EXC) or a continuously advancing mounder (CONT). The MECP of seedlings was carried out using an EXC equipped with a Risutec PM-160 planting device. Generally, the nine study sites in western Finland contained few surface obstacles (e.g., the logging residues had mainly been harvested), which made the conditions very suitable for MECP. The average production time taken by the MECP was 9 h ha-1. The operating hour (G15-h) productivity averaged 215 seedlings G15-h-1 , with the mean planting time being 13.8 s seedling-1. Loading 160 seedlings into the seedling cassette took approximately 10 min (3.8 s seedling-1). Overall, the cost of the MECP was about 5% lower than for the EXC + MAP. However, when productivity was set at <200 seedlings G15-h-1 , the cost of the MECP was higher than that of the EXC + MAP. Based on our findings, the most cost-efficient planting chain was CONT + MAP. However, based on our results, the required level of productivity can be achieved if the sites are suitable for MECP and the machine operators are skilled.
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Kemppainen,
School of Forest Sciences, University of Eastern Finland (UEF), P.O. Box 111, FI-80101 Joensuu, Finland; Natural Resources Institute Finland (Luke), Yliopistokatu 6, FI-80100 Joensuu, Finland
https://orcid.org/0009-0000-6184-8812
E-mail:
kalle.kemppainen@uef.fi
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Kärhä,
School of Forest Sciences, University of Eastern Finland (UEF), P.O. Box 111, FI-80101 Joensuu, Finland
https://orcid.org/0000-0002-8455-2974
E-mail:
kalle.karha@uef.fi
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Laitila,
Natural Resources Institute Finland (Luke), Yliopistokatu 6, FI-80100 Joensuu, Finland
https://orcid.org/0000-0003-4431-3319
E-mail:
juha.laitila@luke.fi
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Sairanen,
School of Forest Sciences, University of Eastern Finland (UEF), P.O. Box 111, FI-80101 Joensuu, Finland
https://orcid.org/0009-0008-8632-3797
E-mail:
anttsair@student.uef.fi
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Kankaanhuhta,
Natural Resources Institute Finland (Luke), Yliopistokatu 6, FI-80100 Joensuu, Finland
https://orcid.org/0000-0001-5785-5972
E-mail:
ville.kankaanhuhta@luke.fi
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Viiri,
UPM-Kymmene Plc, UPM Forest, Peltokatu 26 C 4, FI-33100 Tampere, Finland
https://orcid.org/0000-0003-3952-9481
E-mail:
heli.viiri@upm.com
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Peltola,
School of Forest Sciences, University of Eastern Finland (UEF), P.O. Box 111, FI-80101 Joensuu, Finland
https://orcid.org/0000-0003-1384-9153
E-mail:
heli.peltola@uef.fi
The aim of the study was to update the information pertaining to mechanized tree-planting activity in Finland in 2013 and its success factors. All businesses providing a mechanized tree-planting service were interviewed and asked to describe their equipment and activities, identify critical success factors (CSFs), and suggest areas for improvement. In 2013, 31 planting machines (18 Bracke P11.a, 11 M-Planter and 2 Risutec) operated by 22 businesses planted approximately 4.7 million seedlings on 2663 hectares. CSFs included expertise of planting machine operators, high quality planting, adequate amount of work, stoniness, and removal of slash. Based on the survey, some recommendations for improving mechanized planting work can be made. Firstly, improving the cost-efficiency of mechanized planting is necessary to enhance businesses’ profitability. Secondly, worksite selection is crucial as stoniness, stumps and slash debris diminish productivity. Lastly, the popularity of mechanized planting in the future will benefit from more marketing. Many businesses were unwilling to increase the area of service, invest in new equipment, or increase the volume of planting work but they believed that mechanized planting will become more popular in the near future.
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Laine,
Natural Resources Institute Finland (Luke), Management and Production of Renewable Resources, Juntintie 154, FI-77600 Suonenjoki, Finland
E-mail:
tiina.laine@luke.fi
- Kärhä, Stora Enso Wood Supply Finland, P.O. Box 309, FI-00101 Helsinki, Finland E-mail: kalle.karha@storaenso.com
- Hynönen, University of Eastern Finland, Faculty of Science and Forestry, P.O. Box 111, FI-80101 Joensuu, Finland E-mail: hynonena@gmail.com
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Rantala,
Finnish Forest Research Institute, Suonenjoki Research Unit, Juntintie 154, FI-77600 Suonenjoki, Finland
E-mail:
juho.rantala@metla.fi
- Harstela, Finnish Forest Research Institute, Suonenjoki Research Unit, Juntintie 154, FI-77600 Suonenjoki, Finland E-mail: ph@nn.fi
- Saarinen, Finnish Forest Research Institute, Suonenjoki Research Unit, Juntintie 154, FI-77600 Suonenjoki, Finland E-mail: vms@nn.fi
- Tervo, Finnish Forest Research Institute, Suonenjoki Research Unit, Juntintie 154, FI-77600 Suonenjoki, Finland E-mail: lt@nn.fi
Category : Research note
The use of a white-rot fungus, Chondrostereum purpureum (Pers. Ex Fr.) Pouzar, as a biocontrol agent against sprouting has been studied with good results. The aim of the study was to investigate the efficacy of two pre-commercial thinning machines, Tehojätkä and Mense, to spread an inoculum of C. purpureum as a biocontrol agent on freshly cut birch (Betula pendula Roth and B. pubescens Ehrh.), European aspen (Populus tremula L.), rowan (Sorbus aucuparia L.), and goat willow (Salix caprea L.) stumps (the fungal treatment) and compare that to the control (cutting only, done by Tehojätkä). Efficacy was investigated in terms of stump mortality and the number of sprouts per stump. This study was conducted in one stand and sprouting was investigated for three years after treatment. The fungal treatment resulted in higher mortality of stumps (34.0% for Tehojätkä and 41.5% for Mense after three years), compared to the control (13.4%). However, the fungal treatment did not decrease the number of sprouts per stump compared to the control. The low occurrence of basidiomata indicates that the accuracy of the spreading mechanism was not satisfactory, causing low mortality figures for the fungal treatment compared to previous studies. In the future, this mechanized method may provide a promising alternative in sprout control if the spreading mechanisms, the accuracy of the treatment, and consequently the efficacy could be improved.
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Laine,
Natural Resources Institute Finland (Luke), Natural resources, Juntintie 154, FI-77600 Suonenjoki, Finland
E-mail:
tiina.laine@luke.fi
- Hamberg, Natural Resources Institute Finland (Luke), Bioeconomy and environment, Latokartanonkaari 9, FI-00790 Helsinki, Finland E-mail: leena.hamberg@luke.fi
- Saarinen, Natural Resources Institute Finland (Luke), Natural resources, Juntintie 154, FI-77600 Suonenjoki, Finland E-mail: mulinvuori@gmail.com
- Saksa, Natural Resources Institute Finland (Luke), Natural resources, Juntintie 154, FI-77600 Suonenjoki, Finland E-mail: timo.saksa@luke.fi
