JPH0419190B2 - - Google Patents
Info
- Publication number
- JPH0419190B2 JPH0419190B2 JP18974584A JP18974584A JPH0419190B2 JP H0419190 B2 JPH0419190 B2 JP H0419190B2 JP 18974584 A JP18974584 A JP 18974584A JP 18974584 A JP18974584 A JP 18974584A JP H0419190 B2 JPH0419190 B2 JP H0419190B2
- Authority
- JP
- Japan
- Prior art keywords
- plywood
- resin
- adhesive
- roll
- layer
- 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
Links
- 239000011120 plywood Substances 0.000 claims description 36
- 229920005989 resin Polymers 0.000 claims description 36
- 239000011347 resin Substances 0.000 claims description 36
- 239000000853 adhesive Substances 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 29
- 230000001070 adhesive effect Effects 0.000 claims description 28
- 229920005672 polyolefin resin Polymers 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 20
- 239000012790 adhesive layer Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000002344 surface layer Substances 0.000 claims description 6
- 238000009415 formwork Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 33
- 239000000843 powder Substances 0.000 description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Description
〔産業上の利用分野〕
本発明はコンクリート型枠として用いられる合
板の表面にポリオレフイン系樹脂の樹脂層を形成
する方法に関するものである。
〔従来の技術〕
コンクリート型枠用板は、その使用条件の苛酷
なことから耐衝撃性、耐久性が要求されると同時
に、コンクリート打設後、コンクリート面からの
離型性が要求される。そこで、工場において、板
の表面にアクリル系塗料、ウレタン系塗料等を塗
布していたが、このような方法はシンナー等の溶
剤による公害が発生して問題が多い。そのため最
近では板の表面に樹脂フイルムを貼着したものが
使用され始めている。板の表面に樹脂フイルムを
貼着する方法としては、特開昭58−128850号のよ
うに、先ず、合板上に接着性ポリオレフイン系樹
脂を熱融着せしめ、その上に同種のポリオレフイ
ン系樹脂フイルムを載置し、加熱加圧して貼着し
たものがある。
〔発明が解決しようとする問題点〕
この特開昭58−128850号に開示されている方法
は、木質板の上で熱可塑性合成樹脂の粉体を散布
し、次いで、加熱装置で、該木質板上の粉体を溶
融させ、この溶融した粉体を粉体押えロール間に
通して均一な厚みをもつた接着層とし、この接着
層の上に熱可塑性合成樹脂フイルムを供給して加
熱加圧することにより、木質板上の表面に樹脂層
を形成するものである。この方法においては、フ
イルムの上層（又は上面）は溶融されず、下層
（又は下面）のみが溶融し、フイルムと接着層と
はその界面が相互に溶融し合つた状態で接着され
る。しかしながら、このような溶融状態をつくり
出すための温度範囲は非常に狭く、加熱ロールの
温度調節は困難があつた。例えば、温度があがり
すぎると、合板から発生する水蒸気の圧力が高ま
り、フイルムを押し上げて気泡を生成する。また
温度が低すぎると、溶融が不完全となり、接着強
度が得られないという問題点があつた。
本発明は、合板から水蒸気が発生しても合板と
樹脂層との間で気泡とはならないように樹脂層外
へ脱気せしめて完全な融着を計り、合板に対する
接着強度が強い樹脂層を合板の表面に形成する方
法を提供しようとするものである。
〔問題点を解決するための手段〕
本発明は、合板の表面に接着性を有するポリオ
レフイン系樹脂の粉末を散布し、これを予熱して
から加熱ロールで加熱加圧し、樹脂粉末を溶融し
て合板面に融着せしめ、合板の表面に接着性ポリ
オレフイン系樹脂による通気性のある接着層を形
成してなるものにおいて、該接着層の上に表層剤
として同種の非接着性ポリオレフイン系樹脂を完
全に溶融した状態で供給し、加熱ロールで加圧し
て合板表面に非接着性ポリオレフイン系の樹脂層
を形成せしめたのち、速やかに冷却ロール群を通
過せしめつつ、冷風を吹き付けて樹脂層の表面を
樹脂の熱変形温度以下にまで急速に冷却せしめて
合板の表面に樹脂層を形成してなるものである。
〔作用〕
溶融状態にある接着層上に、表層材として供給
される同種の非接着性ポリオレフイン系樹脂は完
全に溶融した状態で供給されるので、接着層と表
層材とが完全に融合するから強い接着強度が確保
され、また合板から発生す水蒸気は、この完全に
溶融状態のフイルムを突き破つて無視できる程度
の小さい孔となることがあつても、すぐに冷却ロ
ールで加圧されて孔を塞ぐと共に加圧冷却し、加
圧冷却と同時に冷風を吹付けて溶融状態にある樹
脂を表面から急冷するので、ポリオレフイン系樹
脂は結晶が小さくなつて強度が増し、表面形状が
平滑となる。
実施例 １
装置として第１図に示すものを用い、加熱ロー
ル５は200℃、第２の加熱ロール９は250℃にそれ
ぞれ設定し、冷却ロール群１０には12℃の冷水を
循環させ、冷風装置１２としては、ポルテツクス
チユーブの原理を応用したコルダー低温空気発生
器を用い、５℃の冷風を吹付けた。加熱装置４と
しては長さ４ｍの赤外線加熱炉を用い、粉末散布
機２としては静電粉末塗装機を用い、コロコンベ
ヤ１１の送りスピードは６ｍ／mmとした。接着性
ポリオレフイン系樹脂の粉末３としては、昭和電
工株式会社製のER樹脂ER610Nの粉末、粒度50
〜150メツシユのものを用い、非接着性ポリオレ
フイン系樹脂として、三井石油化学工業株式会社
製のハイゼツクス8000F（低圧法ポリエチレン、
融点133℃）のペレツト状のものを用い、押出機
６を使つてＴダイから溶融した樹脂を合板上にカ
ーテン状に吐出供給せしめるようにした。合板１
は厚さ12ミリ、５プライの市販品を使用した。
尚、符号５′は加熱ロール５の受けロール、９′は
第２の加熱ロール９の受けロール、１０′は冷却
ロール群１０の受けロール群であつて、受けロー
ル５′及び９′はそれぞれ加熱を必要とせず、また
１０′の受けロール群は冷却を必要としない。
コロコンベア１１によつて移送される合板１上
に、前記接着性ポリオレフイン系樹脂の粉末３を
25ｇ／M2の割合で均一に散布しつつ加熱装置４
の下を通して粉末３を溶融し、加熱ロール５で合
板１上に融着し、通気性のある接着層を形成し
た。そして、押出機６のＴダイから前記非接着性
ポリオレフイン系樹脂を溶融状態で前記接着層の
上へカーテン状に供給して加熱ロール９で加圧す
る。尚この時、合板の表面には、合板から発生す
る水蒸気が樹脂層を突き破り、無視できる程度の
小さい孔が若干みられたが、この小さい孔は冷却
ロール１０群で加圧されると塞がれると共に、冷
風装置１２から冷風を吹付けて、該樹脂の熱変形
温度（80℃）以下まで急冷したので結晶が小さく
なつて強度が増し、表面が平滑となり、耐衝撃
性、耐久性、離型性に優れたコンクリート型枠用
合板が得られた。
尚冷却ロール群１０の表面温度は10℃〜20℃ま
での間に保つようにすることが好ましい。また、
そのうちの第１及び第２の冷却ロールは表面成形
の役割をなすものであるから、ロール圧を20Kg／
cmの線圧を得られるよう設定され、第３のロール
以後は樹脂層の表面を樹脂の熱変形温度以下にま
で低下せしめるのが目的であるから、線圧５Kg／
cmとした。また、冷風装置から吹き出す冷風の温
度は５℃とした。
実施例 ２
装置としては、第２図に示すものを用い、加熱
ロール５は200℃、第２の加熱ロール９は250℃に
それぞれ設定し、冷却ロール群１０には12℃の冷
水を循環させ、冷風装置１２としては、ボルテツ
クスチユーブの原理を応用したコルダー低温空気
発生器を用い、加熱装置４としては、長さ４ｍの
赤外線加熱炉を用い、粉末散布機２としては静電
粉末塗装機を用い、コロコンベア１１の送りスピ
ードは６ｍ／minとした。接着性ポリオレフイン
系樹脂の粉末３としては、昭和電工株式会社製の
ER樹脂ER610Nの粉末、粒度50〜150メツシユの
ものを用い、表層材としての非接着性ポリオレフ
イン系樹脂フイルム７としては、三井石油化学工
業株式会社製ハイゼツクス8000F（低圧法ポリエ
チレン、融点133℃）、厚さ100μのフイルムを用
いた。また、合板１は厚さ12ミリ、５プライの市
販品を使用した。
尚、符号５′は加熱ロール５の受けロール、
９′は第２の加熱ロール９の受けロール、１０′は
冷却ロール群１０の受けロール群であつて、受け
ロール５′及び９′はそれぞれ加熱を必要とせず、
また１０′の受けロール群は冷却を必要としない。
その他は実施例１と同様にした。コロコンベア１
１によつて移送される合板１の上に前記接着性ポ
リオレフイン系樹脂の粉末３を25ｇ／M2の割合
で均一に散布しつつ加熱装置４及び加熱ロール５
を通過せしめた後、フイルム巻出し装置８からフ
イルム供給ガイドロールを介して表層材としての
フイルム７を繰出し、第２の加熱ロール９の表面
に接触するようにして供給する。この250℃に設
定された第２の加熱ロール９と接触したフイルム
７は直ちに溶融し、ロールの回転に伴なつて合板
１の表面に転写される形となり、合板面に樹脂層
を形成して行く。
引続いて冷却ロール群１０の第１ロールによつ
て樹脂表面から急冷すると共に表面を平滑に成形
し、続いて冷風装置１２によつて５℃の冷風を吹
き付けながら以後の冷却ロール群を通過せしめて
該樹脂の熱変形温度（80℃）以下まで急冷した。
その結果、第２の加熱ロール９と冷却ロール群と
の間で若干の無視できる程度の小さい孔の発生が
見られたが、冷却ロール群１０の第１ロールを通
つた後は押しつぶされてなくなると共に表面は平
滑となりつやも良くなつた。こうして得られたコ
ンクリート型枠用合板の表面樹脂層は合板との接
着強度が極めて強く且つ耐久性、離型性に優れた
ものであつた。
〔比較例〕
第２図に示す装置を使用し、第２の加熱ロール
９の温度を170℃とし、冷却ロール群には常温水
24℃の水を循環させ、冷風装置１２は作動させな
いで、その他は実施例２と同様の合板１、接着性
ポリオレフイン系樹脂粉末３、非接着性ポリオレ
フイン系樹脂フイルム７を使用し、合板１の上に
静電粉末塗装機２を用いて、前記樹脂粉末３を散
布し、加熱装置４で加熱し、加熱ロール５で加熱
加圧して樹脂層を形成し、その上面にフイルム７
を供給し、170℃に加熱されている第２の加熱ロ
ール９によつて前記接着層の上にフイルム７を加
熱加圧して接着したのち、24℃の水を循環させて
いる冷却ロール群１０で冷却して得た試料と、前
記実施例１及び２で得た試料、各３種との接着強
度を比較するため、JIS、K6854に準拠し、引張
速度50mm／minで、90°剥離試験を行つた結果は
下記の通りである。
[Industrial Application Field] The present invention relates to a method for forming a resin layer of polyolefin resin on the surface of plywood used as concrete formwork. [Prior Art] Boards for concrete formwork are required to have impact resistance and durability due to the severe usage conditions, and at the same time, they are required to be releasable from the concrete surface after concrete is poured. Therefore, in factories, acrylic paints, urethane paints, etc., have been applied to the surfaces of the boards, but such methods have many problems due to pollution caused by solvents such as thinner. Therefore, recently, boards with a resin film attached to the surface have begun to be used. As a method of pasting a resin film on the surface of a board, as in JP-A-58-128850, first, an adhesive polyolefin resin is heat-sealed onto the plywood, and then a polyolefin resin film of the same type is placed on top of it. There is one that is attached by placing it on the surface and applying heat and pressure. [Problems to be Solved by the Invention] The method disclosed in JP-A-58-128850 involves spreading thermoplastic synthetic resin powder on a wooden board, and then using a heating device to heat the wood. The powder on the plate is melted, the molten powder is passed between powder press rolls to form an adhesive layer with a uniform thickness, and a thermoplastic synthetic resin film is supplied on top of this adhesive layer and heated. By pressing, a resin layer is formed on the surface of the wooden board. In this method, the upper layer (or upper surface) of the film is not melted, but only the lower layer (or lower surface) is melted, and the film and adhesive layer are bonded to each other with their interfaces fused together. However, the temperature range for creating such a molten state is very narrow, and it is difficult to control the temperature of the heating roll. For example, if the temperature rises too much, the pressure of the water vapor generated by the plywood increases, pushing the film upward and creating bubbles. Furthermore, if the temperature is too low, melting will be incomplete and adhesive strength will not be obtained. In the present invention, even if water vapor is generated from the plywood, air is removed from the resin layer to prevent bubbles from forming between the plywood and the resin layer, and complete fusion is achieved, thereby creating a resin layer with strong adhesive strength to the plywood. The purpose of this invention is to provide a method for forming on the surface of plywood. [Means for Solving the Problems] The present invention involves spraying adhesive polyolefin resin powder on the surface of plywood, preheating the powder, and heating and pressurizing it with heated rolls to melt the resin powder. In products that are fused to the plywood surface to form a breathable adhesive layer made of adhesive polyolefin resin on the surface of the plywood, the same type of non-adhesive polyolefin resin is completely applied as a surface layer agent on the adhesive layer. The plywood is supplied in a molten state and pressurized with heating rolls to form a non-adhesive polyolefin resin layer on the surface of the plywood, and then quickly passed through a group of cooling rolls while blowing cold air to coat the surface of the resin layer. A resin layer is formed on the surface of plywood by rapidly cooling the resin to a temperature below the thermal deformation temperature of the resin. [Operation] The same type of non-adhesive polyolefin resin supplied as the surface layer material is supplied in a completely molten state onto the adhesive layer in a molten state, so the adhesive layer and the surface layer material are completely fused. Strong adhesive strength is ensured, and even if the water vapor generated from the plywood breaks through this completely molten film and creates negligible holes, it is quickly pressurized by the cooling roll to eliminate the holes. The polyolefin resin is sealed and cooled under pressure, and at the same time as the pressure and cooling, cold air is blown to rapidly cool the molten resin from the surface. As a result, the crystals of the polyolefin resin become smaller, the strength increases, and the surface shape becomes smoother. Example 1 The apparatus shown in FIG. 1 was used, the heating roll 5 was set at 200°C, the second heating roll 9 was set at 250°C, 12°C cold water was circulated through the cooling roll group 10, and cold air was As the device 12, a Calder low temperature air generator based on the portex tube principle was used to blow cold air at 5°C. An infrared heating furnace with a length of 4 m was used as the heating device 4, an electrostatic powder coating machine was used as the powder spreader 2, and the feeding speed of the roller conveyor 11 was 6 m/mm. As adhesive polyolefin resin powder 3, powder of ER resin ER610N manufactured by Showa Denko K.K., particle size 50 was used.
~150 mesh was used, and HIZEX 8000F (low-pressure polyethylene, manufactured by Mitsui Petrochemical Industries, Ltd.) was used as a non-adhesive polyolefin resin.
A pellet-like product with a melting point of 133° C.) was used, and an extruder 6 was used to discharge and supply the molten resin from a T-die in a curtain shape onto the plywood. plywood 1
A commercially available 5-ply product with a thickness of 12 mm was used.
Note that 5' is a receiving roll for the heating roll 5, 9' is a receiving roll for the second heating roll 9, and 10' is a receiving roll group for the cooling roll group 10, and the receiving rolls 5' and 9' are respectively No heating is required, and the receiving roll group 10' does not require cooling. The adhesive polyolefin resin powder 3 is placed on the plywood 1 being transferred by the roller conveyor 11.
The heating device 4 is sprayed uniformly at a rate of 25g/ M2 .
The powder 3 was melted by passing under the plywood 1 and fused onto the plywood 1 with a heating roll 5 to form an air-permeable adhesive layer. Then, the non-adhesive polyolefin resin is supplied in a molten state from the T-die of the extruder 6 onto the adhesive layer in a curtain shape, and is pressed with a heating roll 9. At this time, water vapor generated from the plywood broke through the resin layer and some negligible small holes were observed on the surface of the plywood, but these small holes were closed when pressurized by 10 groups of cooling rolls. At the same time, cold air was blown from the cooling air device 12 to rapidly cool the resin to below the heat deformation temperature (80°C), so the crystals became smaller, the strength increased, and the surface became smoother, improving impact resistance, durability, and separation. Plywood for concrete formwork with excellent formability was obtained. The surface temperature of the cooling roll group 10 is preferably kept between 10°C and 20°C. Also,
The first and second cooling rolls play the role of surface forming, so the roll pressure is set to 20kg/
Since the purpose of the third roll and subsequent rolls is to lower the surface of the resin layer to below the thermal deformation temperature of the resin, the linear pressure is 5 kg/cm.
cm. Moreover, the temperature of the cold air blown out from the cold air device was 5°C. Example 2 The apparatus shown in FIG. 2 was used, the heating roll 5 was set at 200°C, the second heating roll 9 was set at 250°C, and 12°C cold water was circulated through the cooling roll group 10. As the cold air device 12, a Calder low-temperature air generator that applies the principle of a vortex tube is used, as the heating device 4, an infrared heating furnace with a length of 4 m is used, and as the powder spreader 2, an electrostatic powder coating machine is used. was used, and the feeding speed of the roller conveyor 11 was 6 m/min. Adhesive polyolefin resin powder 3 is manufactured by Showa Denko Co., Ltd.
ER resin ER610N powder with a particle size of 50 to 150 mesh was used, and the non-adhesive polyolefin resin film 7 as the surface layer material was Hi-Zex 8000F (low-pressure polyethylene, melting point 133°C) manufactured by Mitsui Petrochemical Industries, Ltd. A film with a thickness of 100μ was used. In addition, plywood 1 was a commercially available product with a thickness of 12 mm and 5 plies. In addition, the code 5' is a receiving roll of the heating roll 5,
9' is a receiving roll of the second heating roll 9, 10' is a receiving roll group of the cooling roll group 10, and receiving rolls 5' and 9' do not require heating, respectively.
Also, the receiving roll group 10' does not require cooling.
The rest was the same as in Example 1. Roll conveyor 1
While uniformly scattering the adhesive polyolefin resin powder 3 at a rate of 25 g/M 2 onto the plywood 1 transferred by the heating device 4 and the heating roll 5
After passing through the film, the film 7 as a surface layer material is unwound from the film unwinding device 8 via a film supply guide roll, and is supplied so as to be in contact with the surface of the second heating roll 9. The film 7 that came into contact with the second heating roll 9 set at 250°C melts immediately and is transferred to the surface of the plywood 1 as the roll rotates, forming a resin layer on the plywood surface. go. Subsequently, the resin surface is rapidly cooled by the first roll of the cooling roll group 10 and the surface is smoothed, and then the resin is passed through the subsequent cooling roll groups while being blown with 5°C cold air by the cooling air device 12. The resin was rapidly cooled to below its heat distortion temperature (80°C).
As a result, some negligible small holes were observed between the second heating roll 9 and the cooling roll group, but they were crushed and disappeared after passing through the first roll of the cooling roll group 10. At the same time, the surface became smooth and glossy. The surface resin layer of the plywood for concrete formwork thus obtained had extremely strong adhesive strength with the plywood, and was excellent in durability and mold releasability. [Comparative Example] Using the apparatus shown in Fig. 2, the temperature of the second heating roll 9 was set to 170°C, and the cooling roll group was filled with room temperature water.
The plywood 1, adhesive polyolefin resin powder 3, and non-adhesive polyolefin resin film 7 were used in the same manner as in Example 2, except that 24°C water was circulated and the cold air device 12 was not operated. The resin powder 3 is sprinkled on top using an electrostatic powder coating machine 2, heated by a heating device 4, heated and pressed by a heating roll 5 to form a resin layer, and a film 7 is coated on the top surface.
After the film 7 is heated and pressed onto the adhesive layer by the second heating roll 9 heated to 170°C and bonded, the cooling roll group 10 circulates water at 24°C. In order to compare the adhesive strength of the sample obtained by cooling with the sample obtained in Examples 1 and 2, each of the three types, a 90° peel test was conducted at a tensile rate of 50 mm/min in accordance with JIS, K6854. The results are as follows.
このように本発明では、合板に融着せしめてな
る接着性ポリオレフイン系樹脂層の上に、非接着
性ポリオレフイン系樹脂を完全に溶融した状態で
供給して加熱ロールで加圧したのち、速やかに冷
却ロール群で冷却加圧すると共に、この冷却ロー
ルによる冷却加圧に加えて冷風装置によつて樹脂
の熱変形温度以下になるよう冷風を吹きつけて急
冷せしめるから、気泡の発生はなく、完全な融着
をなし、合板表面の樹脂層は平滑にしてつやよ
く、且つ樹脂の結晶が小さくなつて合板との接着
強度が強く、耐久性、離型性に優れている。
In this way, in the present invention, the non-adhesive polyolefin resin is supplied in a completely molten state onto the adhesive polyolefin resin layer formed by fusion bonding to the plywood, and then the non-adhesive polyolefin resin is applied with a heated roll and then immediately A group of cooling rolls cools and pressurizes the resin, and in addition to the cooling and pressurizing by the cooling rolls, a cold air device blows cold air to the resin to below its thermal deformation temperature for rapid cooling, so there are no bubbles and the resin is completely sealed. The resin layer on the surface of the plywood is smooth and glossy, and the resin crystals are small, so the adhesive strength with the plywood is strong, and it has excellent durability and releasability.
図面は本発明方法を実施するための装置の概略
側面図であつて、第１図は実施例１に使用したも
のの概略側面図、第２図は実施例２に使用したも
のの概略側面図である。
１……合板、２……静電粉末塗装機、３……接
着性ポリオレフイン系樹脂の粉末、４……加熱装
置、５……加熱ロール、６……押出機、７……非
接着性ポリオレフイン系樹脂フイルム、８……フ
イルム巻出し装置、９……第２の加熱ロール、１
０……冷却ロール群、１１……コロコンベア、１
２……冷風装置。
The drawings are schematic side views of an apparatus for carrying out the method of the present invention, in which FIG. 1 is a schematic side view of the device used in Example 1, and FIG. 2 is a schematic side view of the device used in Example 2. . 1...Plywood, 2...Electrostatic powder coating machine, 3...Adhesive polyolefin resin powder, 4...Heating device, 5...Heating roll, 6...Extruder, 7...Non-adhesive polyolefin system resin film, 8... Film unwinding device, 9... Second heating roll, 1
0... Cooling roll group, 11... Roller conveyor, 1
2... Cold air device.
Claims (1)
よる通気性のある接着層を融着してなるものにお
いて、該接着層の上に表層剤として同種の非接着
性ポリオレフイン系樹脂を完全に溶融した状態で
供給し、加熱ロールで加圧して合板表面に非接着
性ポリオレフイン系樹脂層を形成せしめたのち、
すみやかに冷却ロール群を通過せしめつつ冷風を
吹き付けて樹脂層の表面を樹脂の熱変形温度以下
にまで急速に冷却することを特徴とするコンクリ
ート型枠用合板の表面に樹脂層を形成する方法。1 In the case where a breathable adhesive layer made of an adhesive polyolefin resin is fused to the surface of plywood, a non-adhesive polyolefin resin of the same type is completely melted on top of the adhesive layer as a surface layer agent. After supplying and applying pressure with a heated roll to form a non-adhesive polyolefin resin layer on the plywood surface,
A method for forming a resin layer on the surface of plywood for concrete formwork, characterized by rapidly cooling the surface of the resin layer to below the thermal deformation temperature of the resin by blowing cold air while quickly passing through a group of cooling rolls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18974584A JPS6168379A (en) | 1984-09-12 | 1984-09-12 | Method of forming resin layer on surface of plywood for concrete frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18974584A JPS6168379A (en) | 1984-09-12 | 1984-09-12 | Method of forming resin layer on surface of plywood for concrete frame |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6168379A JPS6168379A (en) | 1986-04-08 |
| JPH0419190B2 true JPH0419190B2 (en) | 1992-03-30 |
Family
ID=16246466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18974584A Granted JPS6168379A (en) | 1984-09-12 | 1984-09-12 | Method of forming resin layer on surface of plywood for concrete frame |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6168379A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SI2325093T1 (en) * | 2009-11-20 | 2012-10-30 | Imp Tobacco Ltd | Package for tobacco-related articles |
-
1984
- 1984-09-12 JP JP18974584A patent/JPS6168379A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6168379A (en) | 1986-04-08 |
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