JPH0418521B2 - - Google Patents
Info
- Publication number
- JPH0418521B2 JPH0418521B2 JP59166017A JP16601784A JPH0418521B2 JP H0418521 B2 JPH0418521 B2 JP H0418521B2 JP 59166017 A JP59166017 A JP 59166017A JP 16601784 A JP16601784 A JP 16601784A JP H0418521 B2 JPH0418521 B2 JP H0418521B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- wood material
- powder
- film
- powdered
- 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
Links
- 229920005989 resin Polymers 0.000 claims description 66
- 239000011347 resin Substances 0.000 claims description 66
- 239000000463 material Substances 0.000 claims description 41
- 239000002023 wood Substances 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000010875 treated wood Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 22
- 239000004745 nonwoven fabric Substances 0.000 description 12
- 239000003822 epoxy resin Substances 0.000 description 10
- 229920000647 polyepoxide Polymers 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 244000184861 Juglans nigra Species 0.000 description 3
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002972 Acrylic fiber Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 229920003986 novolac Polymers 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 description 1
- ULKLGIFJWFIQFF-UHFFFAOYSA-N 5K8XI641G3 Chemical compound CCC1=NC=C(C)N1 ULKLGIFJWFIQFF-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007610 electrostatic coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- XLSZMDLNRCVEIJ-UHFFFAOYSA-N methylimidazole Natural products CC1=CNC=N1 XLSZMDLNRCVEIJ-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/10—Next to a fibrous or filamentary layer
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、樹脂処理木質材料の製法に係り、
木質材料を粉体樹脂で加熱加圧処理することによ
り、製造工程の簡略化、製造コストの低減等を図
るようにしたものである。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for producing resin-treated wood materials,
By heating and pressurizing the wood material with powdered resin, it is possible to simplify the manufacturing process and reduce manufacturing costs.
従来の樹脂処理木質材料の製法としては、次の
ようなものがある。突板、化粧単板などの木質材
料をまず減圧脱気し、ついでこれを常圧または加
圧下で液状の反応性樹脂または反応性モノマー
（樹脂液）中に浸漬し、木質材料中に樹脂液を含
浸する。つぎに、これを予備乾燥したのち、加熱
加圧し、樹脂液を硬化させて、目的の樹脂処理木
質材料を得るものである。
Conventional methods for producing resin-treated wood materials include the following. Wood materials such as veneers and decorative veneers are first degassed under reduced pressure, and then immersed in a liquid reactive resin or reactive monomer (resin liquid) at normal pressure or under pressure to soak the resin liquid into the wood material. Impregnate. Next, after pre-drying this, it is heated and pressurized to harden the resin liquid to obtain the desired resin-treated wood material.
しかしながら、このような製法にあつては、次
のような問題点があり、その解決が望まれてい
る。
However, such a manufacturing method has the following problems, and solutions to these problems are desired.
製造工程数が多く、複雑で設備も大がかりと
なる。 There are many manufacturing steps, it is complicated, and the equipment is large-scale.
含浸槽に樹脂液を一定量満し、これに木質材
料を浸漬するので、木質材料に実際に含浸され
る樹脂液量よりも大量の樹脂液が必要となり、
無駄があつた。 Since the impregnation tank is filled with a certain amount of resin liquid and the wood material is immersed in it, a larger amount of resin liquid is required than the amount of resin liquid that is actually impregnated into the wood material.
It was a waste.
含浸を容易にするため、有機溶剤で希釈して
低粘度としているので、本来不必要な有機溶剤
を使用せねばならず、コストが嵩み安全衛生上
の問題もあつた。 In order to facilitate impregnation, it is diluted with an organic solvent to reduce its viscosity, which necessitates the use of an organic solvent that is not originally needed, which increases costs and poses health and safety problems.
そこで、本発明では、木質材料の表面に、粉体
樹脂の溶融により得られた樹脂層を形成し、つい
でこれらを加熱加圧することにより、上記問題点
を解消するようにした。
Therefore, in the present invention, the above-mentioned problems are solved by forming a resin layer obtained by melting powdered resin on the surface of a wood material, and then heating and pressurizing them.
以下、図面を参照しつつ、工程を追つて詳しく
説明する。第１図ないし第３図はこの発明の製法
の一例を工程順に示したもので、図中符号１は突
板、化粧単板などで代表される薄板状の木質材料
である。この木質材料１の厚さは、特に限定され
ないが樹脂の浸透度合から薄いものがよく、0.1
〜0.6mm程度が望ましい。この木質材料１の表面
には、第１図に示すように粉体樹脂２…が塗着さ
れている。ここで使われる粉体樹脂２としては、
エポキシ樹脂、不飽和ポリエステル樹脂、アクリ
ル樹脂などの熱硬化性樹脂の粉径200〜50μｍの
粉末が用いられ、好ましくはノボラツク型エポキ
シ樹脂とビスフエノールＡ型エポキシ樹脂との混
合エポキシ樹脂に硬化剤として２−エチル−４−
メチル−イミダゾールなどのイミダゾール類を添
加した速硬化性のものが用いられる。粉体樹脂２
…の木質材料１への塗着方法は粉体静電塗装法や
落下散布法などが適用できる。粉体樹脂２…の塗
着量は、木質材料１の空孔率、厚み、所望する仕
上り状態によつて適宜決められるが、通常100〜
300ｇ／m2の範囲で決められる。この粉体樹脂２
を塗着した木質材料を、例えば遠赤外線炉を用い
て上記粉体樹脂を溶融し、木質材料に融着させ
る。 Hereinafter, the steps will be explained in detail with reference to the drawings. FIGS. 1 to 3 show an example of the manufacturing method of the present invention in the order of steps, and the reference numeral 1 in the figures indicates a thin plate-like wood material represented by veneer, decorative veneer, etc. The thickness of this wood material 1 is not particularly limited, but it is preferably as thin as 0.1 in view of the degree of penetration of the resin.
~0.6mm is desirable. The surface of this wood material 1 is coated with powder resin 2, as shown in FIG. The powder resin 2 used here is:
Powders of thermosetting resins such as epoxy resins, unsaturated polyester resins, and acrylic resins with a powder diameter of 200 to 50 μm are used, preferably as a curing agent in mixed epoxy resins of novolac type epoxy resins and bisphenol A type epoxy resins. 2-ethyl-4-
A fast-curing material containing imidazoles such as methyl-imidazole is used. Powder resin 2
As a method of coating the wood material 1, a powder electrostatic coating method, a drop scattering method, etc. can be applied. The amount of powder resin 2 to be applied is determined appropriately depending on the porosity, thickness, and desired finish of the wood material 1, but is usually 100 to 100%.
It can be determined within the range of 300g/ m2 . This powder resin 2
The powdered resin is melted using, for example, a far-infrared furnace, and the wood material coated with the powder resin is fused to the wood material.
次に、第２図に示すように粉体樹脂２…が融着
された木質材料１には、粉体樹脂２…の上から離
型用フイルム３，３が被される。そして、これら
はホツトプレス４，４などによつて加熱加圧され
る。離型用フイルム３には、耐熱性がよく、非粘
着性の厚み15〜50μｍのフツ素樹脂フイルムが好
適である。加熱加圧処理条件は、粉体樹脂２の種
類、木質材料１の種類等によつて適宜決められる
が、例えば先の混合エポキシ樹脂を使用した場合
には、温度120〜140℃、時間５〜10分程度とされ
る。なお、この際の圧力は合板等の積層製造に通
常使用される程度の範囲の圧力値が好適に使用さ
れる。この加熱加圧処理によつて、粉体樹脂２…
が溶融し、加圧されて木質材料１内に浸透して硬
化するとともに木質材料１の表面にも留り、硬化
する。 Next, as shown in FIG. 2, the wood material 1 to which the powder resin 2 has been fused is covered with release films 3, 3 from above the powder resin 2. Then, these are heated and pressed by hot presses 4, 4 or the like. As the release film 3, a fluororesin film having good heat resistance, non-adhesion, and a thickness of 15 to 50 μm is suitable. The heating and pressurizing treatment conditions are appropriately determined depending on the type of powder resin 2, the type of wood material 1, etc., but for example, when using the above-mentioned mixed epoxy resin, the temperature is 120 to 140°C, and the time is 5 to It is said to take about 10 minutes. Note that the pressure at this time is preferably within a range of pressure values normally used for laminated manufacturing of plywood and the like. By this heating and pressure treatment, the powder resin 2...
is melted, pressurized, penetrates into the wood material 1 and hardens, and also remains on the surface of the wood material 1 and hardens.
ついで、第３図に示すように離型用フイルム
３，３を剥離すれば、目的とする樹脂処理木質材
料５が得られる。この樹脂処理木質材料５は、木
質材料の表面に、樹脂膜６，６が形成されてい
る。なお、離型用フイルム３に艶消しフイルムを
用いれば、樹脂膜６は艶消し仕上げとなり、艶有
りフイルムを用いれば艶有り仕上げとなる。 Then, as shown in FIG. 3, by peeling off the release films 3, 3, the desired resin-treated wood material 5 is obtained. This resin-treated wood material 5 has resin films 6, 6 formed on the surface of the wood material. Note that if a matte film is used as the release film 3, the resin film 6 will have a matte finish, and if a glossy film is used, it will have a glossy finish.
このような製法にあつては、樹脂膜の形成と密
着、硬化が加熱加圧処理で同時に行えることにな
るので、工程数が少なくなり、作業の簡略化が図
れ、設備もわずかでよい。また、粉体樹脂２…を
木質材料１に塗着しているので、余分の粉体樹脂
２…は有効に回収でき、粉体樹脂２…に無駄が生
じない。また、粉体樹脂２…を用い、ノンソルベ
ントであるので、コスト上有利であるとともに無
公害で安全衛生上も好適である。さらに、得られ
る樹脂処理木質材料５の表面には樹脂膜６が形成
されるので、そのまま製品とすることができ、上
塗り塗装が不要となる。
In such a manufacturing method, the formation, adhesion, and curing of the resin film can be performed simultaneously by heat and pressure treatment, so the number of steps is reduced, the work is simplified, and only a small amount of equipment is required. Further, since the powder resin 2 is applied to the wood material 1, the excess powder resin 2 can be effectively recovered, and the powder resin 2 is not wasted. Further, since the powder resin 2 is used and is non-solvent, it is advantageous in terms of cost, and is non-polluting and suitable in terms of safety and health. Furthermore, since the resin film 6 is formed on the surface of the resulting resin-treated wood material 5, it can be used as a product as it is, and no top coat is required.
また、第４図に示すように、粉体樹脂２…上に
透明性の不織布７，７を置いてから、同様に熱圧
処理してもよい。この方法によれば、不織布７，
７と木質材料１とに樹脂が含浸して硬化し、不織
布７，７と木質材料１とが一体化し、得られる樹
脂処理木質材料５の機械的強度が向上する。そし
て、粉体樹脂２と不織布７，７の繊維との屈折率
が近似していれば、樹脂膜６，６中の不織布７，
７は視認されなくなり、樹脂膜６，６の透明性が
維持される。このため、不織布７には薄手のもの
が好ましく、坪量10〜30ｇ／m2程度のアクリル繊
維などよりなるものがよい。
Alternatively, as shown in FIG. 4, transparent nonwoven fabrics 7, 7 may be placed on top of the powder resin 2 and then subjected to heat and pressure treatment in the same manner. According to this method, the nonwoven fabric 7,
7 and the wood material 1 are impregnated with resin and cured, the nonwoven fabrics 7, 7 and the wood material 1 are integrated, and the mechanical strength of the resulting resin-treated wood material 5 is improved. If the refractive index of the powder resin 2 and the fibers of the nonwoven fabrics 7, 7 are similar, then the nonwoven fabrics 7, 7 in the resin films 6, 6,
7 is no longer visible, and the transparency of the resin films 6, 6 is maintained. For this reason, the nonwoven fabric 7 is preferably thin, and preferably made of acrylic fiber or the like with a basis weight of about 10 to 30 g/m 2 .
さらに、第５図に示すように、不織布７，７に
予め粉体樹脂２…を溶射、融着などの手段によつ
て塗着しておき、このものを木質材料１に載置し
て加熱加圧処理してもよい。この方法によれば、
予め上記粉体樹脂塗着不織布を別に用意しておく
ことができ、材料の取扱いが容易となり、作業能
率を向上させることもできる。不織布７に代え
て、離型用フイルム３に粉体樹脂２…を塗着して
も同様の効果が得られる。なお、この方法では、
粉体樹脂２…を不織布７に塗着する際、塗着後に
おいてもいまだ熱溶融性が残るようにその塗着条
件を設定する必要がある。 Furthermore, as shown in FIG. 5, powdered resin 2 is applied to the nonwoven fabrics 7, 7 in advance by means such as thermal spraying or fusion, and this is placed on the wood material 1 and heated. Pressure treatment may also be applied. According to this method,
The powder resin-coated nonwoven fabric can be prepared separately in advance, making it easier to handle the material and improving work efficiency. Similar effects can be obtained by applying powdered resin 2 to the release film 3 instead of the nonwoven fabric 7. In addition, in this method,
When applying the powder resin 2 to the nonwoven fabric 7, it is necessary to set the application conditions so that the resin still has thermal meltability even after application.
実施例 １
木質材料として、厚み0.2mmのアメリカンウオ
ールナツト突板を用意し、この突板の表裏面にそ
れぞれノボラツク型エポキシ樹脂60重量部、ビス
フエノール型エポキシ樹脂40重量部、硬化剤２−
エチル−４−メチル−イミダゾール３重量部より
なる粉末エポキシ樹脂（粒径100メツシユパス）
を坪量150ｇ／m2となるように散布した。次に、
温度450℃の遠赤外線炉中に20秒間入れ樹脂を溶
融し、突板上に融着させた。ついで離型用フイル
ムとして厚さ25μｍのポリフツ化ビニルフイルム
を置き、ホツトプレスにて130℃、10分熱圧処理
した。得られた樹脂処理突板は、樹脂強化され、
かつ表面にも樹脂膜が形成され、美麗な仕上りの
アメリカンウオールナツト化粧材となつた。Example 1 An American walnut veneer with a thickness of 0.2 mm was prepared as a wood material, and 60 parts by weight of novolak type epoxy resin, 40 parts by weight of bisphenol type epoxy resin, and 2-hardening agent were applied to the front and back surfaces of this veneer, respectively.
Powdered epoxy resin consisting of 3 parts by weight of ethyl-4-methyl-imidazole (particle size 100 mesh pass)
was sprayed at a basis weight of 150 g/m 2 . next,
The resin was melted by placing it in a far-infrared oven at a temperature of 450°C for 20 seconds and was fused onto the veneer. Next, a polyvinyl fluoride film having a thickness of 25 μm was placed as a release film, and heat and pressure treatment was performed at 130° C. for 10 minutes using a hot press. The resulting resin-treated veneer is reinforced with resin,
A resin film was also formed on the surface, making American walnut a decorative material with a beautiful finish.
実施例 ２
実施例１において、アメリカンウオールナツト
突板に粉末エポキシ樹脂を散布したのち、この上
に坪量24ｇ／m2のアクリル繊維製不織布を置き、
ついで離型用フイルムを置き、同様に加熱加圧処
理した。得られた樹脂処理突板は、実施例１のも
のに比べて、その曲げ弾性率が３倍になり、かつ
表面の樹脂膜中に不織布を視認しえなかつた。Example 2 In Example 1, after spraying powdered epoxy resin on the American walnut veneer, a nonwoven fabric made of acrylic fiber with a basis weight of 24 g/m 2 was placed on top of the powdered epoxy resin.
Then, a release film was placed and heat and pressure treatment was performed in the same manner. The resulting resin-treated veneer had a bending elastic modulus three times that of that of Example 1, and no nonwoven fabric was visible in the resin film on the surface.
以上説明したように、本発明の樹脂処理木質材
料の製法は、木質材料を粉体樹脂で加熱加圧処理
するものであるので、樹脂膜の形成と密着、硬化
が加熱加圧処理で同時に行えることになり製造作
業の簡略化が計れ、製造設備も簡単なもので済
む。粉体樹脂を使用しているので、余分の粉末樹
脂を有効回収できるとともに、ノンソルベントシ
ステムとなつて、コスト的に有利となり、無公害
で安全衛生上も好ましい。また、得られた樹脂処
理木質材料には上塗り塗膜に代る樹脂膜が形成さ
れるので、そのまま化粧材として製品とすること
もできる。
As explained above, the method for producing resin-treated wood materials of the present invention involves heating and pressurizing the wood material with powdered resin, so that the formation, adhesion, and curing of the resin film can be performed simultaneously through the heat and pressure treatment. This simplifies the manufacturing work and requires simple manufacturing equipment. Since powdered resin is used, excess powdered resin can be effectively recovered, and the system is a non-solvent system, which is advantageous in terms of cost, and is non-polluting, which is preferable in terms of safety and health. Furthermore, since a resin film is formed on the obtained resin-treated wood material in place of the top coat, it can be used as a product as a decorative material as it is.
第１図ないし第３図はこの発明の製法の一例を
工程順に示す説明図、第４図および第５図はいず
れもこの発明の他の例を示す説明図である。
１……木質材料、２……粉体樹脂、５……樹脂
処理木質材料。
FIGS. 1 to 3 are explanatory diagrams showing an example of the manufacturing method of the present invention in the order of steps, and FIGS. 4 and 5 are explanatory diagrams showing other examples of the present invention. 1...Wood material, 2...Powder resin, 5...Resin-treated wood material.
Claims (1)
られた樹脂層を形成し、ついでこれらを加熱加圧
することを特徴とする樹脂処理木質材料の製法。1. A method for producing a resin-treated wood material, which comprises forming a resin layer obtained by melting powdered resin on the surface of the wood material, and then heating and pressurizing the layer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16601784A JPS6143502A (en) | 1984-08-08 | 1984-08-08 | Manufacture of resin-treated ligneous material |
| US06/763,470 US4637954A (en) | 1984-08-08 | 1985-08-07 | Resin-treated woody material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16601784A JPS6143502A (en) | 1984-08-08 | 1984-08-08 | Manufacture of resin-treated ligneous material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6143502A JPS6143502A (en) | 1986-03-03 |
| JPH0418521B2 true JPH0418521B2 (en) | 1992-03-27 |
Family
ID=15823366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16601784A Granted JPS6143502A (en) | 1984-08-08 | 1984-08-08 | Manufacture of resin-treated ligneous material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6143502A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007229934A (en) * | 2006-02-27 | 2007-09-13 | Olympus Corp | Method of manufacturing compressed wood product |
| CN105965648A (en) * | 2016-04-29 | 2016-09-28 | 宁波中加低碳新技术研究院有限公司 | Manufacturing method of embossed mold pressing plate or sectional material for outdoor use |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55130716A (en) * | 1979-03-30 | 1980-10-09 | Matsushita Electric Works Ltd | Hardened woody veneer and its preparation |
-
1984
- 1984-08-08 JP JP16601784A patent/JPS6143502A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55130716A (en) * | 1979-03-30 | 1980-10-09 | Matsushita Electric Works Ltd | Hardened woody veneer and its preparation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6143502A (en) | 1986-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |