Max­i­miz­ing value through vi­sion scan­ning

Australasian Timber - - MANUFACTURING TECHNOLOGY -

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value and re­cov­ery out of those logs. “We se­lected USNR be­cause we be­lieved the BioVi­sion sys­tem could ful­fill our re­quire­ments.” The Taupo op­er­a­tion com­prises a com­plete sawmill, dry kilns, planer mill, and sec­ondary pro­cess­ing plants. The site pro­cesses Prune Butt logs into ap­pear­ance grade prod­ucts in­clud­ing lum­ber, solid lin­eal mould­ings and clear pine boards.

The sup­ply

At Taupo, logs are a mix of sizes rang­ing in di­am­e­ter from 35cm to 950cm. The sup­ply be­gins with a ra­dius back un­scram­bler feed­ing a turn/pass sta­tion and lug loader that is mon­i­tored from above uti­liz­ing USNR’s Mil­lTrak sys­tem for flow and back­log con­trol. The boards pass through the trans­verse scan­ner and on to the Max­i­mizer po­si­tion­ing in­feed ta­ble where they are rapidly fed into the 5-saw edger saw­box. The edged boards exit the process via USNR’s Fly­ing-V Tailer, with tail­ings sep­a­rated to a waste belt be­low. The saw­box se­lected for this ap­pli­ca­tion uti­lizes 5 saws and a shift­ing straight edge with hold-over shoe. This al­lows the mill to process splits with one saw, and no edg­ings. Dar­ryl com­mented, “We ba­si­cally run slower than what the ma­chine is ca­pa­ble of run­ning. When we run wide boards we want to be ab­so­lutely sure the so­lu­tion re­cov­ers the high­est value. We can cut up to about 100 mm thick, and ev­ery shift has a dif­fer­ent cut rang­ing from 5/4, 25mm, 50mm, 65mm, 77mm, etc. It varies all the time, and that was the idea for choos­ing the 5-saw ma­chine.”

Data col­lec­tion

The sen­sor the Tenon team chose with the sys­tem is the BioLuma 2900LVG. This sen­sor is a pow­er­house for col­lect­ing high den­sity data from geo­met­ric mea­sure­ments and vis­ual char­ac­ter­is­tics, to grain an­gle mea­sure­ments. It is the only sen­sor on the mar­ket to in­te­grate this range of technology within a sin­gle sen­sor hous­ing. It is, with­out a doubt, the best sen­sor on the mar­ket for the job of col­lect­ing the vast amounts of data re­quired for ac­cu­rate and pre­cise de­fect recog­ni­tion and anal­y­sis on green lum­ber.

The lay­out – Tenon and Skookum con­nec­tion

De­sign­ing the lay­out for the sys­tem didn’t come eas­ily. Kaki Waenga, Tenon Project Man­ager, noted: “The con­cept changed sev­eral times. Tenon’s project en­gi­neer­ing team work­ing with oper­a­tions per­son­nel, re­viewed a num­ber of lay­outs with Skookum Technology. We ini­tially tried to in­sert the new Edger line within our ex­ist­ing build­ing foot­print.” The fi­nal de­sign came from the Tenon project team, sit­u­at­ing the Edger next to the ex­ist­ing pro­duc­tion line, which proved to be a very strate­gic move and paid large div­i­dends in time man­age­ment and com­mis­sion­ing. That’s where USNR’s agent on the ground in New Zea­land, Skookum Technology, came in. Skookum’s Gen­eral Man­ager, Ge­off Strang, re­lates: “Skookum as­sisted with the orig­i­nal project fea­si­bil­ity study, and worked with Tenon over a pe­riod of time spec­i­fy­ing and de­ter­min­ing the best lay­out for the new edger line.”

Pos­i­tive per­for­mance

Dar­ryl re­lated the ben­e­fits that Tenon has achieved. “We’re get­ting an in­crease in log to lum­ber re­cov­ery, more than we ini­tially ex­pected, so we’re re­ally pleased with that. Also the sys­tem al­lows us to do a lot more ra­tio­nal­iz­ing of prod­ucts to im­prove ef­fi­cien­cies in our sec­ondary pro­cess­ing.” He also noted the project de­liv­ered all the ben­e­fits out­lined in the orig­i­nal scope and was de­liv­ered on time. “The board edger was a game-changer for us. It’s changed the bot­tle­neck in the sawmill. We can put more wood out of our fa­cil­ity, we’ve in­creased our through­put, now we’ve got to look at the rest of the mill and speed that up to bal­ance mill flow.” To­day, Tenon’s needs for im­proved re­cov­ery and through­put have been more than sat­is­fied with their technology choice. Tenon de­scribes the op­er­a­tion as the coun­try’s largest sin­gle site pro­ducer of de­fect-free, ap­pear­ance grade ra­di­ata pine prod­ucts. This new edger line, with its BioVi­sion grad­ing ca­pa­bil­ity, dove­tails nicely with the com­pany’s goal to ex­pand and grow its out­put and its mar­ket, and to main­tain its stan­dards for the ut­most in qual­ity prod­ucts. USNR has long been a front-run­ner in ad­vanc­ing this technology, and is proud that the strong re­la­tion­ships it has forged with cus­tomers like Hyne Tim­ber and Tenon have al­lowed it to pro­vide the tools our cus­tomers need to­day to meet their goals.

Tenon-edger-in­feed 2: As flitches are trans­ported through the scan zone the image and ap­pli­ca­ble de­fect data is dis­played on the user in­ter­face screen.

De­fect: This piece demon­strates the value equa­tion uti­liz­ing edger BioVi­sion. The top screen so­lu­tion uses vis­ual de­fect op­ti­miza­tion com­pared with the bot­tom so­lu­tion which uses laser pro­file data only. Hav­ing the op­ti­mizer switch the po­si­tion of the 100mm prod­uct, the mill is able to ob­tain a higher grade board.

845-screen: The BioVi­sion op­ti­mized de­ci­sion shows a 2-board so­lu­tion; 1. is a #3 Shop 5/4 x RW, 150 mm wide x 3.6 m long. 2. is a #2 Shop 5/4 x 145 mm wide x 3.6 m long. The in­ter­face also shows such de­tails as saw po­si­tions, re­cov­ery vol­ume and value, list of cut­tings from each board, etc.

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