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    Wyświetlanie 1-4 z 4
    Tytuł:
    Przejazdy po drogach leśnych i publicznych przy dostawach wielkowymiarowego drewna sosnowego do tartaku
    Driving on forest and public roads in deliveries of large-size Scots pine wood to sawmill
    Autorzy:
    Tymendorf, L.
    Trzciński, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/979086.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wood supply chain
    wood deliveries
    transport optimization
    backhauling
    transport stages
    Opis:
    The aim of the presented research was to characterize the driving related to the deliveries of large−size Scots pine wood and to determine the factors affecting its structure and distance. Operation was divided in to: driving for load on a public and forest road, forest ride between loading points, as well as driving with saw logs on a forest and public road. Data on the distance traveled on forest and public roads (empty and with load), as well as, the number of loading places was determined on the data from drivers. In total, 1509 randomly selected deliveries carried out over a period of twelve months from 40 forest districts were analyzed. Investigated transports delivered 44,336 m3 of large−size pine round wood to the sawmill. Most deliveries were made within 100 km from the plant. Within this radius, 83.87% of drives for load and 75.35% drives with load were completed. The average distance for driving for load on a public road was 60.6 km, with the range from 0.5 to 205 km. The average driving distance with load to the sawmill was 70 km, the shortest distance 2 km and the longest – 238 km. Driving distances on forest roads, for and with load, was on the similar level of 3.5 and 3.4 km, respectively. The average distance in the forest, between loading points was 3.1 km, with SD=2.9 km, maximum 16 km. The largest share, 51.4% of total delivery distance, was related to driving with saw logs on a public road and depends on how many places in the forest the wood was picked up. In 36% of all deliveries, saw logs were loaded from two or more places, which involved additional drive on forest roads at the distance of 1,652 km. The analysis did not show statistically significant differences between driving depending on the season of the year. The stable wood supply during 12 months period, shows that large stocks of round wood to secure productions during sensitive periods (winter), is not needed.
    Źródło:
    Sylwan; 2020, 164, 08; 651-662
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czas trwania etapów dostawy wielkowymiarowego drewna sosnowego do tartaku
    Duration of stages of delivery of large-sized Scots pine wood to the sawmill
    Autorzy:
    Tymendorf, L.
    Trzciński, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/979337.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    wood supply chain
    saw logs transport
    duration time
    round wood transport stages
    Opis:
    The efficiency of wood transport depends not only on the maximum load capacity, but also on the duration of individual transport operations. The purpose of the presented research is to analyze the duration of transport stages of Scots pine large−size wood (saw logs) and indicate the factors that affect the structure of the duration of the entire operation. The operation was divided in to truck driving for a load on a public and forest road, driving between loading points in the forest including timber loading, driving with saw logs on a forest and public road, waiting for entry to the sawmill as well as verification and unloading of wood in the sawmill. Data on the duration of each operation was determined on the basis of information obtained from the course information cards. The waiting time for entering the sawmill as well as wood checking and unloading was based on data from wood reception in sawmill. 1514 randomly selected transports in a period of twelve months from 40 forest districts were analyzed. The average time of empty drive for a load by public road was 1:03 [hh:mm], with the range from 0:01 to 7:30. Driving time with a load to the sawmill was an average of 1:23, with the span from 0:05 to the 5:30. Driving on forest roads for load and with load is at a similar level of 11−12 minutes. The average time of loading wood in the forest was 39 minutes, with a minimum of 10 minutes, and maximum of 3 hours. Most trucks entered the plant immediately, nevertheless the average waiting time was 38 minutes, and the majority (75%) of transports need to wait up to one hour. Volume and quality checking, as well as unloading in the plant, took 42 minutes on average. The shortest delivery lasted 1:00 and the longest 17:37. The average transport duration of wood to the sawmill was 4:51. The number of places for loading wood in the forest has significant impact on the duration of collecting the load, and thus also on the time of the entire delivery. The largest fraction in the total duration of transport is associated with traveling on public roads. 27.1 and 28.8% is the time of loaded truck, and 20.5% and 21.7% is the time of the empty ride. A big difference (5%) occurs the time of collecting wood in the forest depending on the number of places from which wood was loaded. This time has a significant share (17.45%) in the structure of the delivery duration. Duration of the individual stages of wood transport in particular months shows little variability.
    Źródło:
    Sylwan; 2020, 164, 07; 549-559
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dostawy drewna po wprowadzeniu normatywnych przeliczników gęstości drewna do określenia masy ładunku
    Timber deliveries after introduction of the normative calculators of wood density to determine the load weight
    Autorzy:
    Trzciński, G.
    Tymendorf, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/989076.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    surowce drzewne
    lancuch dostaw
    drewno
    gestosc drewna
    przeliczniki gestosci drewna
    masa ladunku
    transport
    dostawy drewna
    wood supply chain
    timber logistic
    structure of wood supply
    wood deliveries
    Opis:
    The State Forests National Forest Holding that manages 77.1% of the forests in Poland intend to harvest over 40 million m³ of timber, which is supposed to supply the demand from some thousand timber processing companies. Introduction of a new normative for determination of the timber load weight as a result of multiplication its volume and wood density significantly changed timber transport regulations in 2012. The study analyzes the timber supply to a large (over 300 thousand m³ of wood per year) sawmill in the first half of 2012 and 2016. On the first date standard mass conversion indices were not implemented yet. We analysed whether there are significant differences in the timber deliveries between 2012 and 2016 with regard to monthly and weekly scale as well as in relation to the days of the week. In the first half of 2012 there was 4946 deliveries, which provided more than 126 thousand m³ of timber. In the same period of 2016 there was 6109 deliveries with total volume of 178 thousand m³. Increase in timber demand by 41% resulted in an increase in the number of transports only by 23.5%. Considering the distribution of the deliveries in each of 27 weeks, the average number of courses equal to 183 per week in 2012 and 226 in 2016. In first half of 2012, no courses were recorded in week 18, 26 and 27, while the highest number – in the week 16 (305 shipments). In 2016 only in first week there was no courses, and the maximum (312 deliveries) was reached in the sixth week. Average volume of weekly deliveries in 2012 amounted to 5234 m³, while in 2016 it reached 6595 m³. Maximum values equaled 7706 and 9026 m³ respectively. We noticed significant difference in the number of shipments and the volume of the delivered timber between the study periods, which results mainly from the increased production and demand.
    Źródło:
    Sylwan; 2017, 161, 06; 451-459
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Logistyka dostaw surowca sosnowego
    Logistics of Scots pine wood supply
    Autorzy:
    Wieruszewski, M.
    Trociński, A.
    Kawalerczyk, J.
    Mydlarz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/979088.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    pine wood
    transport
    supply costs
    supply chain
    Opis:
    The supply of raw material is the result of the logistical link between the actions of forest and wood companies. Research on sustainable development for this area of activity results from cooperation between representatives of forests, transport companies and wood industry companies. The rationale for the undertaken projects is determined by the level of interference of transport activities and taking into account its impact on the environment and social needs. The aim of the study was to verify the process of transport planning and its implementation in an economically and environmentally effective way, in terms of sustainable material flows. The results present cases of trade in coniferous raw wood material in the area of medium−sized plants, with round wood processing in the range from 30 to 100 thousand m3. The role of transport requirements in this trade was assessed, i.e. optimal use of available transport routes, vehicle loading and collection from forest areas. The paper presents the dependence of the flow of coniferous wood from forests to selected groups of sawmill customers on the distance and periodicity of demand in particular processing phases. For a properly functioning sustainable supply chain it is necessary to maintain a balance between economic aspects and environmental values. When undertaking logistic activities in the scope of raw material supplies, it is necessary to approach the indicated issues comprehensively
    Źródło:
    Sylwan; 2020, 164, 08; 637-642
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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