JPH0725597Y2 - Resin recovery device for veneer dryer - Google Patents

Resin recovery device for veneer dryer

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Publication number
JPH0725597Y2
JPH0725597Y2 JP1988099568U JP9956888U JPH0725597Y2 JP H0725597 Y2 JPH0725597 Y2 JP H0725597Y2 JP 1988099568 U JP1988099568 U JP 1988099568U JP 9956888 U JP9956888 U JP 9956888U JP H0725597 Y2 JPH0725597 Y2 JP H0725597Y2
Authority
JP
Japan
Prior art keywords
exhaust
veneer
drying
cooling section
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP1988099568U
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Japanese (ja)
Other versions
JPH0220093U (en
Inventor
正行 馬場
Original Assignee
株式会社ウロコ製作所
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Priority to JP1988099568U priority Critical patent/JPH0725597Y2/en
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Application granted granted Critical
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Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、合板製品の素材となる、原木から旋削された
薄板シート状の単板を乾燥する単板乾燥装置に係り、単
板の乾燥中に、含有水分と共に飛散する樹脂を排気筒内
において液化回収する装置に関するものである。
[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a veneer dryer for drying a thin sheet-like veneer that has been turned from raw wood, which is a material for plywood products. The present invention relates to a device for liquefying and recovering a resin that scatters together with contained water in an exhaust stack.

〔従来の技術〕[Conventional technology]

従来の単板乾燥装置としては、装置内への単板の送入部
と取出し部を除いて、断熱材などを充填した保温板によ
って、単板乾燥装置のほとんどを密閉容器状に遮蔽構築
しその装置内を適宜速度で単板を移送する搬送機構を備
えるとともに、スチームなどを熱源にした熱交換器によ
って高温化した熱風を被乾燥物に吹きつけながら乾燥
し、乾燥に伴い低温化するとともに被乾燥物から飛散し
た水分を含んだ湿潤空気と、前記熱風を循環させるファ
ン、熱風、および湿潤空気を圧送する通風路、および湿
潤空気を調節して外部へ排気するダンパーなどにより構
成された装置が多用されている。これら従来の単板乾燥
装置における排気筒は、湿潤空気の通風路上面に立設さ
れ、その先端を工場の屋外に突き出しているもので、例
えば第2図に示すように上部へまっすぐ伸びており、排
気筒の内側に図示は省略したが流体シリンダなどによ
り、開閉自在なダンパーが備えられていたのである。
As a conventional veneer drying device, most of the veneer drying device is shielded and constructed in the shape of a closed container with a heat insulating plate filled with a heat insulating material, etc., except for the veneer feeding part and the unloading part. It is equipped with a transfer mechanism that moves the veneer inside the device at an appropriate speed, and it is dried by blowing hot air heated by a heat exchanger using steam etc. as a heat source onto the material to be dried, and the temperature is lowered with the drying. A device composed of moist air containing moisture scattered from a material to be dried, a fan for circulating the hot air, a ventilation path for feeding the hot air and the moist air, and a damper for adjusting the moist air and discharging it to the outside. Is often used. The exhaust stack in these conventional veneer dryers is erected on the upper surface of the ventilation path for moist air and has its tip protruding outside the factory. For example, as shown in FIG. 2, it extends straight upward. Although not shown in the drawing, a damper that can be opened and closed by a fluid cylinder or the like was provided inside the exhaust stack.

これらの従来例としては、例えば「単板乾燥装置」特開
昭59−164877号がある。この発明は、高熱エネルギーの
節約が目的で、熱交換器の前後に配備された温度検出装
置、および蒸気供給口の圧力スイッチの信号により、警
報装置または、熱風ファンの駆動装置を制御する制御装
置を配備したものである。
As a conventional example of these, there is, for example, Japanese Patent Laid-Open No. 59-164877. The present invention aims at saving high heat energy, and a controller for controlling an alarm device or a drive device of a hot air fan by a signal of a temperature detecting device arranged before and after a heat exchanger and a signal of a pressure switch of a steam supply port. Are deployed.

〔考案が解決しようとする課題〕[Problems to be solved by the device]

国内の合板工場における原材料は、最近の原木事情から
従来採用した広葉樹材以外に国産、その他の針葉樹材の
活用を図らなければならない状況になってきた。そして
これら針葉樹は広葉樹に較べ樹脂含有量が極めて多く、
特に乾燥温度で単板から飛散する樹脂類の処理が生産工
程の隘路となってきたのである。
As for the raw materials at domestic plywood factories, due to the recent situation of raw wood, it has become necessary to utilize domestically produced softwood lumber other than hardwood lumber that has been conventionally adopted. And these softwoods have a much higher resin content than hardwoods,
In particular, the treatment of resins that scatter from veneers at the drying temperature has become a bottleneck in the production process.

合板製品の素材となる薄板シート状の単板は、通常、原
木から旋削された状態で含水率が重量比で100%以上に
もおよび、常法として120〜200℃の熱風により加熱し15
〜20%程度の含水率に乾燥するのである。
The thin sheet-like veneer used as the material for plywood products usually has a water content of 100% or more by weight when turned from raw wood, and is usually heated by hot air at 120 to 200 ° C.
It is dried to a water content of about 20%.

一方、前記樹脂は精油成分と固形分(ロジン質)からな
り、装置内温度100℃程度の加熱で精油成分は単板表面
に移動し、引続き加熱されて気化し、同時に蒸発した単
板内水分とともに乾燥装置内へと飛散することになる。
On the other hand, the resin consists of an essential oil component and a solid content (rosin), and the essential oil component moves to the surface of the veneer by heating at an internal temperature of about 100 ° C, and is subsequently heated and vaporized, and at the same time, the water content in the veneer that has evaporated At the same time, it will be scattered into the dryer.

以上の気化精油成分を含んだ湿潤空気は単板乾燥進行に
つれて低温化し、通風路を経て排気筒へ誘導され、ダン
パー等によって排気量を調整されながら屋外へと放出さ
れるのである。
The wet air containing the vaporized essential oil component is cooled as the veneer is dried, is guided to the exhaust stack through the ventilation passage, and is discharged outdoors while the displacement is adjusted by the damper or the like.

また、排気筒の内部は上方へ行くほど、乾燥装置からの
熱を受けにくく、比較的低温であり、そのため大部分の
湿潤空気は外部へ放出されるが、残りの湿潤空気は装置
内と縦方向に伸びる排気筒内の上方との温度差により液
化し、それと共に気化精油成分も液化し排気筒内壁に付
着し、それが第2図図示のように下方へと流れながら、
乾燥装置や湿潤空気の熱により水あめ状になりダンパー
に付着し、さらに下方へと流れ落ち通風路内部にまで付
着するのであった。その精油成分は乾燥装置内の熱風と
共に循環し、ロールなどを汚す結果となったのである。
Further, as the inside of the exhaust stack goes up, it is less likely to receive heat from the drying device and is at a relatively low temperature. Therefore, most of the moist air is discharged to the outside, but the remaining moist air is discharged vertically to the inside of the device. Liquefies due to the temperature difference between the upper part of the exhaust pipe and the upper part of the exhaust pipe, and the vaporized essential oil component is also liquefied and adheres to the inner wall of the exhaust pipe, which flows downward as shown in FIG.
Due to the heat of the drying device and the moist air, it became a candy-like form and adhered to the damper, and further fell downward to adhere to the inside of the ventilation passage. The essential oil component circulates together with the hot air in the dryer, resulting in the contamination of the rolls and the like.

それらの付着した精油成分は一度乾燥装置の運転を休止
すると、水あめ状だった精油成分が冷えて固まって硬く
なり、ダンパーに付着した場合ダンパーが作動できなく
なり、付着した精油成分の固まりをたがねとハンマーに
よって取り除かなければ再び単板乾燥を行うことができ
なかったのである。
Once the essential oil components attached to them are suspended from operation of the drying device, the essential oil components that were syrup cool and harden by hardening, and if they adhere to the damper, the damper cannot operate and the essential oil components adhere The veneer could not be dried again without removing it with a sledgehammer.

〔課題が解決するための手段〕[Means for solving the problem]

この考案に係る単板乾燥装置の排気筒は、縦方向に伸び
る排気冷却部と、曲り部を持った排気保温部と、排気冷
却部の下端に設けた樹脂受皿とからなっている。通風路
上部にダンパーを内設した排気保温部を接合して、さら
に排気保温部の排気側の排気口と排気口を上にした排気
冷却部の一側面の下端寄りの吸気側とを接合して、樹脂
受皿を排気冷却部の下端に止め具により着脱自在に配備
している。
The exhaust stack of the veneer drying apparatus according to the present invention comprises an exhaust cooling section extending in the vertical direction, an exhaust heat retaining section having a bent section, and a resin tray provided at the lower end of the exhaust cooling section. An exhaust heat insulation part with a damper inside is joined to the upper part of the ventilation passage, and the exhaust port on the exhaust side of the exhaust heat insulation part is joined to the intake side near the lower end of one side of the exhaust cooling part with the exhaust port above. Then, the resin tray is detachably attached to the lower end of the exhaust cooling section by a stopper.

〔作用〕[Action]

排気筒の内部温度は上方に行くほど比較的低温で外気温
度に近く、大部分の湿潤空気は外部へ放出されるが残り
の湿潤空気は排気保温部と排気冷却部との温度差により
冷却され液化し、それと共に気化精油成分も液化し排気
冷却部内部に付着し、それが乾燥装置や湿潤空気の熱に
より水あめ状になりながら下方へと流れ落ちる。そして
樹脂受皿に水あめ状になった精油成分がたまることにな
ることになるのである。
The internal temperature of the exhaust stack is relatively low as it goes upward and is close to the outside air temperature, and most of the moist air is discharged to the outside, but the rest of the moist air is cooled by the temperature difference between the exhaust heat insulation part and the exhaust cooling part. It liquefies, and the vaporized essential oil component also liquefies and adheres to the inside of the exhaust cooling unit, and it falls into a candy-like form due to the heat of the dryer and wet air and flows downward. Then, the candy-like essential oil component is accumulated in the resin saucer.

〔実施例〕〔Example〕

本考案の一実施例を図面を参照しながら説明すると第1
図は排気筒の斜視図、第3図は排気筒の側面から見た断
面図、第4図は単板乾燥装置全体の側面図、第5図は第
4図を正面から見た断面図、第6図は他の実施例であ
り、排気筒の側面から見た断面図である。
A first embodiment of the present invention will be described with reference to the drawings.
FIG. 3 is a perspective view of the exhaust stack, FIG. 3 is a cross-sectional view of the exhaust stack as seen from a side surface, FIG. 4 is a side view of the entire single plate drying apparatus, and FIG. 5 is a cross-sectional view of FIG. 4 as viewed from the front. FIG. 6 is another embodiment and is a cross-sectional view seen from the side surface of the exhaust stack.

図において単板乾燥装置10は単板を矢示方向に移送する
上下に3段の搬送路を配した単位乾燥セクション11を複
数直列に連設した構成となっておりその始端部(第4図
の左端部)には矢示A方向に単板を装置内へ送り込む入
口コンベア1が設けられている。
In the figure, the veneer drying device 10 has a constitution in which a plurality of unit drying sections 11 having three stages of conveying paths for transferring the veneers in the direction of the arrow are arranged in series and the starting end portion (see FIG. 4). An inlet conveyor 1 for feeding the veneer into the apparatus in the direction of arrow A is provided at the left end portion of FIG.

複数連設した単位乾燥セクションの末端部には熱風を受
けて昇温した単板を適温に冷却する冷却セクション10C
が配備され、引続き単板を装置外へ取り出す出口コンベ
ア23が配設されている。10Fは冷却ファンである。
Cooling section 10C that cools the veneer heated to hot air at the end of the unit drying section
And an outlet conveyor 23 for taking out the veneer out of the apparatus. 10F is a cooling fan.

第4図は説明のため、中間部付近の単位乾燥セクション
の外板を外して図示している。14は搬送機構を構成する
搬送ローラーであり、上下3段の搬送路面を形成し後方
配備の駆動装置21により矢示B方向に単板を移送するも
のである。
For the purpose of explanation, FIG. 4 is shown with the outer plate of the unit drying section near the middle part removed. Reference numeral 14 denotes a transport roller which constitutes a transport mechanism and which transports the veneer in the direction of arrow B by a rearwardly arranged drive device 21 which forms a transport road surface of three upper and lower stages.

13はファンである。電動機12によって回転駆動され、第
5図の左右側方に跳ね出した形に取付けられた通風ダク
ト15により装置内の空気を矢示TからOへと吸引した後
さらに、連設された単位乾燥セクション11上に載置状態
に設けられた通風路16を図左方から右方へと圧送するの
である。
13 is a fan. The air inside the device is sucked from the arrow T to O by the ventilation duct 15 which is rotationally driven by the electric motor 12 and is attached to the left and right sides of FIG. The ventilation passage 16 provided on the section 11 is pumped from the left side to the right side in the figure.

17はスチームなどの熱源をストップバルブ33を介して導
入する、フィンヒーターなどにより構成された熱交換器
である。従ってファン13により付勢された空気は矢示P
からQへと前記熱交換器を通過することで加熱されて熱
風となり、引続き通風ダクト15′を矢示RからSへと降
下し、さらに単板の移送方向に逆らって矢示SからT方
向へ進むのである。
Reference numeral 17 is a heat exchanger configured by a fin heater or the like for introducing a heat source such as steam through the stop valve 33. Therefore, the air urged by the fan 13 is indicated by the arrow P.
From Q to Q, it is heated by passing through the heat exchanger to become hot air, and then descends from the ventilation duct 15 'from R to S in the direction of the arrow, and further from the direction S to the direction of T in the direction opposite to the transfer direction of the veneer. Proceed to.

単板の搬送方向に逆行して、単板を擦過しながら通過す
る熱風は、順次、乾燥を進めるとともに温度を下げ、さ
らに先へ進んでファン13に吸引され前述の循環径路を辿
るのである。
The hot air, which passes through the veneer in the direction of conveyance and passes through the veneer while rubbing the veneer, successively progresses drying and lowers the temperature, and further advances to be sucked by the fan 13 to follow the above-mentioned circulation path.

40は乾燥作業に伴い発生した湿潤空気を屋外へと排出す
る排気筒である。縦方向に伸びる排気冷却部40Aと曲り
部を持った排気保温部40Bとを第1図のように接合して
ある。
Reference numeral 40 is an exhaust stack that discharges the moist air generated by the drying work to the outside. An exhaust cooling unit 40A extending in the vertical direction and an exhaust heat insulating unit 40B having a bent portion are joined as shown in FIG.

41は排気保温部40Bの下方に内設したダンパーで、図示
は省略したが流体シリンダなどにより開閉自在な機構と
なっている。
Reference numeral 41 denotes a damper provided below the exhaust heat retention section 40B, which has a mechanism that can be opened and closed by a fluid cylinder or the like although not shown.

42は排気冷却部40Aの下端に設けた樹脂受皿で、止め具4
3により止めてある。
42 is a resin tray provided at the lower end of the exhaust cooling unit 40A, which is a stopper 4
Stopped by 3.

以上の構成により、ファン13により付勢された装置内空
気は、矢示O−P−Q−R−S−T方向に循環を繰り返
しながら、熱交換器17を通過することによって加熱され
る一方、単板は逐次搬送されながら、これらの熱風を浴
びて順次乾燥されるのである。また単板乾燥が進むにつ
れて装置内には湿潤空気が充満するため、乾燥効率が低
下しないように、その都度、前記湿潤空気をダンパーを
開いて排気筒から屋外へ排気して湿度調整を行うのであ
る。
With the above configuration, the air inside the apparatus urged by the fan 13 is heated by passing through the heat exchanger 17 while repeatedly circulating in the O-P-Q-R-S-T direction indicated by the arrow. The veneers are successively transported and are dried by being exposed to these hot air. Also, as the veneer drying progresses, the inside of the device is filled with moist air, so that the moist air is exhausted from the exhaust pipe to the outside each time to adjust the humidity so that the drying efficiency does not decrease each time. is there.

第3図は、排気筒の側面から見た断面図であり、矢示の
方向へと湿潤空気は排気され、排気冷却部内壁に付着し
た精油成分は下方に流れ、樹脂受皿42にたまり、止め具
43を外してこれを回収するのである。
FIG. 3 is a cross-sectional view as seen from the side of the exhaust stack, in which the moist air is exhausted in the direction of the arrow, and the essential oil components adhering to the inner wall of the exhaust cooling section flow downwards and accumulate in the resin tray 42 and stop. Ingredient
Remove 43 and collect it.

第6図は、本考案の他の実施例で排気筒の側面から見た
断面図で、第3図の排気筒の作用と同じであり、要する
に本考案の排気筒は湿潤空気を気化状態のまま維持する
排気保温部と湿潤空気を液化させる排気冷却部を設け、
そして下方に取外し可能な樹脂受皿を備えていれば良い
のである。
FIG. 6 is a sectional view of the other embodiment of the present invention seen from the side of the exhaust pipe, which is the same as the operation of the exhaust pipe of FIG. 3, in short, the exhaust pipe of the present invention shows a state in which wet air is vaporized. An exhaust heat insulation part that keeps it as it is and an exhaust cooling part that liquefies wet air are provided,
It is only necessary to provide a removable resin tray below.

なお排気保温部における保温手段は、図示は省略した
が、断熱材などを排気筒外周面に巻きつけて行う。
Although not shown in the drawings, the heat retaining means in the exhaust heat retaining portion is formed by winding a heat insulating material around the outer peripheral surface of the exhaust cylinder.

また排気冷却部における冷却手段は自然冷却でも構わな
いが、夏の暑い時期などには、排気筒外周面に配管を巡
らせて水を循環させたりする水冷方式または、冷却ファ
ンにより風を吹き付けたり、排気冷却部外周面にひれ状
のものを多数個設ける空冷方式などにより、強制的に冷
却を行うと精油成分を効率良く液化回収することができ
るのである。
The cooling means in the exhaust cooling unit may be natural cooling, but in hot summer months, a water cooling system in which water is circulated by circulating a pipe around the outer peripheral surface of the exhaust pipe, or by blowing air with a cooling fan, The essential oil component can be efficiently liquefied and recovered by forcibly cooling it by an air cooling method in which a large number of fins are provided on the outer peripheral surface of the exhaust gas cooling unit.

〔考案の効果〕[Effect of device]

以上の本考案によれば次のような効果を得ることができ
る。
According to the present invention described above, the following effects can be obtained.

排気筒の排気冷却部内壁に付着した液化精油成分を樹脂
受皿に集め、回収することにより、ダンパーに精油成分
が付着しないので、ダンパーの開閉ができなくなった
り、また精油成分が通風路内部に付着したため、それが
熱風により乾燥装置内を循環し、ロールなどを汚すこと
がなくなるのである。
By collecting and collecting the liquefied essential oil component adhering to the inner wall of the exhaust cooling section of the exhaust stack in a resin tray, the essential oil component does not adhere to the damper, so the damper cannot be opened or closed, and the essential oil component adheres inside the ventilation passage. Therefore, it does not circulate in the drying device due to hot air and does not pollute the rolls and the like.

さらに回収した液化精油成分は、冷えば木酢液や木ター
ルなどの原料として再利用することができるのである。
Furthermore, the recovered liquefied essential oil component can be reused as a raw material such as wood vinegar and wood tar if cooled.

【図面の簡単な説明】[Brief description of drawings]

第1図は、本考案の排気筒の斜視図、第2図は従来の排
気筒の側面から見た断面図、第3図は本考案の排気筒の
側面から見た断面図、第4図は単板乾燥装置全体の側面
図、第5図は第4図を正面から見た断面図、そして第6
図は本考案の他の実施例で排気筒の側面から見た断面図
である。 1……入口コンベア 10……単板乾燥装置 11……単位乾燥セクション 16……通風路 17……熱交換器 23……出口コンベア 40……排気筒 40A……排気冷却部 40B……排気保温部 41……ダンパー 42……樹脂受皿 RE……精油成分
FIG. 1 is a perspective view of an exhaust stack of the present invention, FIG. 2 is a sectional view of a conventional exhaust stack as seen from a side surface, FIG. 3 is a sectional view of the exhaust stack of the present invention as seen from a side surface, and FIG. Is a side view of the whole veneer dryer, FIG. 5 is a sectional view of FIG. 4 as seen from the front, and FIG.
FIG. 3 is a cross-sectional view of a side view of an exhaust stack according to another embodiment of the present invention. 1 …… Inlet conveyor 10 …… Single plate dryer 11 …… Unit drying section 16 …… Ventilation path 17 …… Heat exchanger 23 …… Exit conveyor 40 …… Exhaust stack 40A …… Exhaust cooling section 40B …… Exhaust heat insulation Part 41 …… Damper 42 …… Resin saucer RE …… Essential oil component

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】単板を移送しながら乾燥する単板乾燥装置
において、外周面を断熱材により被覆した、逆L字状の
曲り部を持った排気保温部と、排気口を上にし、吸気口
を排気冷却部の一側面の下端寄りに設けた細長い排気冷
却部とからなり、横に突出した排気保温部の排気口と排
気冷却部の吸気口とを接合し、該排気保温部に内設した
ダンパーと、排気冷却部下端に着脱自在に配備した樹脂
受皿とを設け、通風路上面に立設した排気筒を特徴とす
る単板乾燥装置における樹脂回収装置。
1. A veneer drying apparatus for drying a veneer while transporting the veneer, wherein an exhaust heat insulation part having an inverted L-shaped bent part whose outer peripheral surface is covered with a heat insulating material, and an exhaust port facing upward are provided. The exhaust cooling section has an elongated exhaust cooling section which is provided on one side of the exhaust cooling section near the lower end, and the laterally projecting exhaust warming section's exhaust port and the exhaust cooling section's intake port are joined together to form an internal portion of the exhaust warming section. A resin recovery device for a single-plate drying device, which is provided with an installed damper and a resin tray that is detachably provided at a lower end of an exhaust cooling section, and has an exhaust pipe erected on an upper surface of a ventilation path.
【請求項2】単板を移送しながら乾燥する単板乾燥装置
において、外周面を断熱材により被覆した、逆J字状の
曲り部を持った排気保温部と、排気口を上にし、J字状
の曲り部を持った細長い排気冷却部とからなり、排気保
温部の曲り部先端の排気口と排気冷却部の曲り部先端の
吸気口とを接合し、該排気保温部に内設したダンパー
と、排気冷却部下端に着脱自在に配備した樹脂受皿とを
設け、通風路上面に立設した排気筒を特徴とする単板乾
燥装置における樹脂回収装置。
2. A veneer drying apparatus for drying a veneer while transferring the veneer, wherein an outer peripheral surface is covered with a heat insulating material, and an exhaust heat insulation part having an inverted J-shaped bent part is provided, and an exhaust port is turned up. It is composed of an elongated exhaust cooling part having a bent shape, and the exhaust port at the bent end of the exhaust heat retaining part and the intake port at the bent end of the exhaust cooling part are joined to each other and provided inside the exhaust heat retaining part. A resin recovery device for a single-plate drying device, characterized in that a damper and a resin tray that is detachably attached to the lower end of the exhaust cooling section are provided, and an exhaust pipe is erected on the upper surface of the ventilation passage.
JP1988099568U 1988-07-27 1988-07-27 Resin recovery device for veneer dryer Expired - Lifetime JPH0725597Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988099568U JPH0725597Y2 (en) 1988-07-27 1988-07-27 Resin recovery device for veneer dryer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988099568U JPH0725597Y2 (en) 1988-07-27 1988-07-27 Resin recovery device for veneer dryer

Publications (2)

Publication Number Publication Date
JPH0220093U JPH0220093U (en) 1990-02-09
JPH0725597Y2 true JPH0725597Y2 (en) 1995-06-07

Family

ID=31326847

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988099568U Expired - Lifetime JPH0725597Y2 (en) 1988-07-27 1988-07-27 Resin recovery device for veneer dryer

Country Status (1)

Country Link
JP (1) JPH0725597Y2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205914A (en) * 1983-05-11 1984-11-21 田中 義弘 Heating method of culture greenhouse

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205914A (en) * 1983-05-11 1984-11-21 田中 義弘 Heating method of culture greenhouse

Also Published As

Publication number Publication date
JPH0220093U (en) 1990-02-09

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