Effect of Log Length on Forestry Loading and Unloading

Arcego, Henrique; Robert, Renato Cesar Gonçalves; Brown, Rafael Oliveira

doi:10.1590/2179-8087.026917

Original Article, Forest Management • Floresta Ambient. 26 (2) • 2019 • https://doi.org/10.1590/2179-8087.026917 linkcopy

Effect of Log Length on Forestry Loading and Unloading

Authorship SCIMAGO INSTITUTIONS RANKINGS

This study aimed to technically evaluate loading and unloading with different wood lengths . Data used were obtained from log harvesting areas of a forestry company in southern Brazil, on operations with loblolly pine logs. The study addressed the analysis of time and motion, being divided into loading, unloading, mooring and unmooring. Four treatments with different log lengths, number of safety straps and number of sampled vehicles were analyzed. Analysis of variance and Tukey test were used to evaluate differences among treatments. Loading and unloading productivity increase of 114% and 92% was observed, respectively, when log length increased from 2.4 m to 7 m. When log length increased, productivity and yield of hours/work also increased. Loading was negatively influenced by the environment where the activity was carried out.

Keywords:
productivity; forest; logistics

Treatments	Means (in decimal minutes) *
Treatments	Loading	Unloading	Lashing	Unlashing
T1	24.73 c	8.52 c	7.43 b	6.29 b
T2	17.54** b	6.70** b	4.85 a	4.04 a
T3	17.54** b	6.70** b	7.33 b	6.08 b
T4	11.29 a	4.44 a	4.87 a	3.94 a

Loading
Arrangement	Treatment	Load Weight (t)	Time (min)	Productivity (t he^-1)	Yield (%)
PTP-240	T1	43.62	24.73	105.83
PTP-340	T2 and T3	41.56	16.49	151.22	30.01
PTP-700	T4	33.34	11.3	177.03	40.22
Mean		39.51	17.51	144.69
Unloading
Arrangement	Treatment	Load Weight (t)	Time (min)	Productivity (t he^-1)	Yield (%)
PTP-240	T1	43.62	8.98	291.45
PTP-340	T2 and T3	41.56	5.99	416.29	29.99
PTP-700	T4	33.34	4.44	450.54	35.31
Mean		39.51	6.47	386.09

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[TFN1] ^*
Means followed by the same letter do not differ by the Tukey test with 5% probability; **Means are equivalent to T2 and T3 Treatments because during loading and unloading operatons, only log lengths were analyzed; T1: Length of 2.40 m; using 6 security straps (1 per package); T2: length of 3.40 m; using 4 safety straps (1 per package); T3: length of 3.40 m; using 8 safety straps (2 per package); length of 7.00 m; using 4 safety straps (2 per package).