JPS6392368A - Production of core material for surfboard or saleboard and material of core material used therein - Google Patents

Production of core material for surfboard or saleboard and material of core material used therein

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Publication number
JPS6392368A
JPS6392368A JP61236330A JP23633086A JPS6392368A JP S6392368 A JPS6392368 A JP S6392368A JP 61236330 A JP61236330 A JP 61236330A JP 23633086 A JP23633086 A JP 23633086A JP S6392368 A JPS6392368 A JP S6392368A
Authority
JP
Japan
Prior art keywords
core material
extruded polystyrene
polystyrene foam
foam board
thickness
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.)
Pending
Application number
JP61236330A
Other languages
Japanese (ja)
Inventor
繁 若菜
塚越 吾郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Kakoh KK
Original Assignee
Dow Kakoh KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dow Kakoh KK filed Critical Dow Kakoh KK
Priority to JP61236330A priority Critical patent/JPS6392368A/en
Publication of JPS6392368A publication Critical patent/JPS6392368A/en
Pending legal-status Critical Current

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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、合成樹脂発泡体製のサーフボード又はセール
ボード用芯材の製造方法及び当該製造方法に適した芯材
の材料に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of manufacturing a core material for surfboards or sailboards made of synthetic resin foam, and a core material suitable for the manufacturing method.

[従来の技術] 従来、合成樹脂発泡体製のサーフボード又はセールボー
ド用芯材としては、次のものが知られている。
[Prior Art] Conventionally, the following core materials for surfboards or sailboards made of synthetic resin foam are known.

(1)硬質ポリウレタンを、サーフボード又はセールボ
ードの形状をした中空の合成樹脂成形品中に注入発泡さ
せて型成形したもの。
(1) Hard polyurethane is injected and foamed into a hollow synthetic resin molded product in the shape of a surfboard or sailboard.

(2)製品よりも少し大きめの硬質ポリウレタン発泡成
形品から電気カンナ等で削成したもの。
(2) A hard polyurethane foam molded product slightly larger than the product, cut with an electric plane, etc.

(3)ポリスチレン系ビーズを、芯材の型内で発泡させ
て型形成したもの。
(3) A mold formed by foaming polystyrene beads in a core mold.

一方、ポリスチレン系発泡体として、ト記(3)のよう
なビーズ発泡体の他に、押出発泡体が知られている。こ
の押出法ポリスチレン系発泡体は、建築用断熱材等とし
て広く使用されているが、押出法ポリスチレン系発泡体
製のサーフボード及びセールボード用芯材は従来存在し
ていなかった。
On the other hand, extruded foams are known as polystyrene foams in addition to bead foams such as (3). This extruded polystyrene foam is widely used as a heat insulating material for buildings, etc., but core materials for surfboards and sailboards made of extruded polystyrene foam have not hitherto existed.

[発明が解決しようとする問題点] ところで、サーフボード及びセールボードは、ボードが
軽くなれば軽くなるほどライディングスピード及びコン
トロール性が向」ニすることから、芯材の軽量化が重要
となる。しかし、合成樹脂発泡体には、軽量化すると強
度が落ち、強度を上げると重袖が増すという性質があり
、従来の前記(1)〜(3)の芯材は、いずれもこの軽
量化と強度の要求に対して不十分なものとなっている。
[Problems to be Solved by the Invention] Incidentally, in surfboards and sailboards, it is important to reduce the weight of the core material because the lighter the board, the better the riding speed and controllability. However, synthetic resin foam has the property that its strength decreases when its weight is reduced, and its heavy sleeves increase when its strength is increased. It is insufficient to meet the requirements for strength.

また、芯材には、表面塗装層が傷伺いたり破損したりし
ても水を吸って重くならないことが必要であるが、前記
(1)〜(3)の芯材は、この非吸水性の要求の対して
も不十分なものとなっている。
In addition, the core material needs to not absorb water and become heavy even if the surface coating layer is scratched or damaged, but the core materials in (1) to (3) above are It is also insufficient to meet the demands of the government.

更に、前記(1)〜(3)の芯材は、個々に次のような
問題も有している。
Furthermore, each of the core materials (1) to (3) described above also has the following problems.

前記(1)の芯材の場合、注入発泡が発泡状態の不均一
を生じやすいことから、物性の均一性に問題がある。
In the case of the core material (1) above, there is a problem in the uniformity of physical properties because injection foaming tends to cause non-uniformity in the foaming state.

前記(2)の芯材の場合、他のものに比して特に重いと
いう問題がある。
In the case of the core material (2) above, there is a problem that it is particularly heavy compared to other core materials.

前記(3)の芯材の場合、ビーズ発泡体製であるために
、強度の点で前記(1)及び(2)の芯材より劣るばか
りか、型成形後の切削仕−1−げによってビーズ融着部
が露出すると、水が浸入しやすくなって吸水性が大きく
なると共に、塗料の浸入によるむらを生じやすく、表面
塗装後の意匠性が低下してしまう問題がある。
In the case of the core material (3) above, since it is made of bead foam, it is not only inferior to the core materials (1) and (2) above in terms of strength, but also due to the cutting process after molding. When the bead fused portion is exposed, water easily enters and the water absorbency increases, and there is also a problem in that unevenness is likely to occur due to the infiltration of paint, and the design quality after surface painting is deteriorated.

一方、押出法ポリスチレン系発泡体は、ポリスチレン系
ビーズ発泡体と比較しては勿論のこと、硬質ポリウレタ
ン発泡体に比較して、気泡径が均一でかつ軽量性と耐圧
強度とのバランスに優れたものが得やすく、はとんど吸
水性がないという利点がある。そこで、この押出法ポリ
スチレン系発泡体で芯材を製造することが考えられる。
On the other hand, extruded polystyrene foams have uniform cell diameters and an excellent balance between lightness and compressive strength, not only compared to polystyrene bead foams but also compared to rigid polyurethane foams. It has the advantage that it is easy to obtain and has almost no water absorption. Therefore, it is possible to manufacture the core material using this extruded polystyrene foam.

しかしながら、押出法ポリスチレン系発泡体は、その製
造工程上、全て板状の成形品となり、型成形で異形品を
製造することは不可能である。
However, due to the manufacturing process, extruded polystyrene foams are all plate-shaped molded products, and it is impossible to manufacture irregular-shaped products by molding.

従って、押出法ポリスチレン系発泡板を芯材へと削成す
ることになるが、これには次のような問題がある。
Therefore, the extruded polystyrene foam board is cut into a core material, but this has the following problems.

まず、押出法ポリスチレン系発泡板は、芯材の前後の反
りを全て削り出せるほど大きな厚みのものが得にくいこ
とである。また、このような厚みのものが得られたとし
ても、芯材の前後の反りを全て削り出したのでは、前記
(2)のものと同様に、手間がかかると同時に材料の無
駄が多いものとなってしまう。
First, it is difficult to obtain an extruded polystyrene foam board with a thickness large enough to remove all the warpage from the front and back of the core material. Furthermore, even if such a thickness could be obtained, cutting out all the warpage at the front and back of the core material would be time consuming and wasteful of material, as in (2) above. It becomes.

そこで、押出法ポリスチレン系発泡板を湾曲させること
によって芯材の前後の反りを形成することが考えられる
Therefore, it is considered that the extruded polystyrene foam board is curved to form a warp in the front and back of the core material.

しかしながら、押出法ポリスチレン系発泡板は、曲げに
対する強い反発弾性を有しており、単純に曲げ加工を施
すことは困難である。仮に、この曲げ加工を施したとし
ても、サーフボードやセールボードとするには70〜2
00mmもの厚みが必要で、一般建築用断熱材等として
使用されている20〜50mm程度の厚みのものをその
まま利用することはできない。また、厚みを増大させて
行くに従って、型成形の不可能な押出法ポリスチレン系
発泡体で芯材を成形するに不可欠な電気カンナ等による
削成を行うときにささくれを生じゃすくなり、実質的に
削成ができなくなる問題がある。
However, extruded polystyrene foam boards have strong rebound resilience against bending, and it is difficult to simply bend them. Even if this bending process were applied, it would take 70~2 to make a surfboard or sailboard.
A thickness of 0.00 mm is required, and materials with a thickness of about 20 to 50 mm, which are used as insulation materials for general construction, cannot be used as they are. In addition, as the thickness increases, hangnails are more likely to occur when cutting with an electric plane, etc., which is essential for forming the core material from extruded polystyrene foam, which cannot be molded. There is a problem that it becomes impossible to delete the file.

[問題点を解決するための手段] 」1記問題点を解決するための手段を説明すると、第一
の発明においては、押出法ポリスチレン系発泡板を、湾
曲させ、これを保持したまま、加熱した後冷却すること
によって湾曲を固定し、その後芯材の形状に削成すると
いう手段を講じており、第二の発明では、押出法ポリス
チレン系発泡板を平芯材に削成し、これを、湾曲させて
保持したまま、加熱した後冷却することによって湾曲を
固定するという手段を講じているものである。また、」
−記載一及び第二の発明に用いる押出法ポリスチレン系
発泡板について、第二の発明においては、厚み、幅、長
さの各方向の圧縮強さCν、CHlC「が、全方向の圧
縮強さの和CSt、1Mに対し、下記■〜■式を満足す
る関係を持ち、かつ平均気泡径が1.Omm以F、密度
が20〜40kg/m” 、厚みが70mm以F、10
0mm未満の押出法ポリスチレン系発泡板とするという
手段を講じており、第四の発明においては、上記押出法
ポリスチレン系発泡板の厚みを100mm以上200m
m以下とするという手段を講じているものである。
[Means for Solving the Problems] To explain the means for solving the problem in item 1, in the first invention, an extruded polystyrene foam board is bent and heated while being held. After that, the curvature is fixed by cooling it, and then it is cut into the shape of the core material.In the second invention, an extruded polystyrene foam board is cut into a flat core material, and this is The method is to fix the curvature by heating and cooling the curvature while holding it. Also,"
- Regarding the extruded polystyrene foam board used in the first and second inventions, in the second invention, the compressive strengths Cν and CHlC in each direction of thickness, width, and length, but the compressive strength in all directions CSt, 1M, has a relationship that satisfies the following formulas 1 to 2, and has an average cell diameter of 1.0 mm or more, a density of 20 to 40 kg/m'', and a thickness of 70 mm or more, 10
In the fourth invention, the extruded polystyrene foam board has a thickness of 100 mm or more and 200 m.
Measures have been taken to keep it below m.

CV/CSUM≧0.16   ・・−−−■C++/
C5us≧0.16・・・・・■CF/C5LI−≧0
.16   ・−・−■更に本発明の詳細な説明する。
CV/CSUM≧0.16 ・・−−■C++/
C5us≧0.16・・・・■CF/C5LI−≧0
.. 16 ・−・−■ The present invention will be further explained in detail.

第一の発明について説明すると、第一の発明で用いる押
出法ポリスチレン系発泡板は、押出発泡を行って適宜の
長さに切断しただけのものの他、製造すべき芯材の反り
を延した形状のアウトラインを定める形状にまで荒削り
したものをも含む。
To explain the first invention, the extruded polystyrene foam board used in the first invention has a shape that extends the warp of the core material to be manufactured, as well as one that is simply cut into an appropriate length after extrusion foaming. This includes rough-hewn shapes that define the outline of the shape.

本発明でいう押出法ポリスチレン系発泡板とは、発泡剤
を含むポリスチレン系合成樹脂を連続的に押出して発泡
させ、切断して板状にしたものをいう。ここで、ポリス
チレン系合成樹脂とは、例えば、スチレン、α−メチル
スチレン、クロルスチレン、ジクロルスチレン、ジメチ
ルスチレン、t−ブチルスチレン、ビニルトルエンなど
のスチレン誘導体類の単独重合体、又は、2種以上の組
合せからなる共重合体、あるいはこれらのスチレン誘導
体類とジビニルベンゼン、メチルメタクリレート、アク
リロニトリル、又は、ブタジェンのような他と容易に重
合しうる化合物の少量との共重合体をいう。
The extruded polystyrene foam board as used in the present invention refers to a board made by continuously extruding and foaming a polystyrene synthetic resin containing a foaming agent, and cutting the foam into a board shape. Here, the polystyrene-based synthetic resin is, for example, a homopolymer of styrene derivatives such as styrene, α-methylstyrene, chlorostyrene, dichlorostyrene, dimethylstyrene, t-butylstyrene, vinyltoluene, or two types thereof. It refers to a copolymer consisting of a combination of the above, or a copolymer of these styrene derivatives and a small amount of a compound that can be easily polymerized with another such as divinylbenzene, methyl methacrylate, acrylonitrile, or butadiene.

第一の発明における押出法ポリスチレン系発泡板の湾曲
保持は、例えば第1図に示されるように、対向面が湾曲
面となった一対の治具1a 。
In the first invention, the extruded polystyrene foam board is held in curve by a pair of jigs 1a whose opposing surfaces are curved surfaces, as shown in FIG. 1, for example.

lb間に押出法ポリスチレン系発泡板2を挟み付けるこ
とによって行うことができる。両治具la、lb間には
、押出法ポリスチレン系発泡板2の厚みと略等しい高さ
のスペーサー3が四隅に介在しており、押出法ポリスチ
レン系発泡板2に過度の圧縮力が作用しないようになっ
ている。
This can be done by sandwiching an extruded polystyrene foam board 2 between the lbs. Between both jigs la and lb, spacers 3 having a height approximately equal to the thickness of the extruded polystyrene foam board 2 are interposed at the four corners, so that excessive compressive force does not act on the extruded polystyrene foam board 2. It looks like this.

第2図に示されるように、湾曲した板状の治具ICを多
数枚重ね、各治具ICの間にスペーサー3と共に押出法
ポリスチレン系発泡板2を挟み付けるようにすれば、−
度に多数の押出法ポリスチレン系発泡板2を湾曲させて
保持することができる。
As shown in FIG. 2, if a large number of curved plate-shaped jig ICs are stacked and an extruded polystyrene foam board 2 is sandwiched between each jig IC along with a spacer 3, -
A large number of extruded polystyrene foam boards 2 can be curved and held at the same time.

」−記治具1a、lb、lcの湾曲は、製造すべき芯材
に必要な前後の反りに略一致する反りを押出法ポリメチ
1/ン系発泡板2に賦形できるものが好ましい。また、
治具1a、lb、lcの反り量δ1 (第1図参照)と
、後述する加熱・冷却によって押出法ポリスチレン系発
泡板2に賦形される反り量δ2 (第3図参照)は、δ
1より62の方がやや小さくなる傾向にあるので、これ
を考慮して、製造すべき芯材に必要な前後の反り量に比
して治具1a、lb、lcの反り量δ1をやや大きくし
ておくことが好ましい。
- The curvature of the marking jigs 1a, lb, and lc is preferably one that can shape the extruded polymethylene foam board 2 into a curvature that approximately corresponds to the front-to-back curvature required for the core material to be manufactured. Also,
The amount of warpage δ1 of the jigs 1a, lb, and lc (see Figure 1) and the amount of warpage δ2 (see Figure 3) formed on the extruded polystyrene foam board 2 by heating and cooling (described later) are δ
62 tends to be slightly smaller than 1, so taking this into consideration, the amount of warpage δ1 of jigs 1a, lb, and lc is slightly larger than the amount of warpage from the front and back required for the core material to be manufactured. It is preferable to keep it.

第一発明においては、上記のようにして湾曲させて保持
した押出法ポリスチレン系発泡板2を、この湾曲保持を
したまま加熱して軟化させた後冷却して、押出法ポリス
チレン系発泡板2に反りを賦形する。加熱し、湾曲が固
定する前に湾曲保持を解除したのでは、通常この湾曲は
押出法ポリスチレン系発泡板2の曲げ弾性範囲内で行わ
れるため、押出法ポリスチレン系発泡板2が弾性復帰し
てしまい、必要な反りを賦形できなくなる。また、加熱
した後冷却前に湾曲保持を解除すると、押出法ポリスチ
レン系発泡板2の反りが一部復帰し、所期の反りの賦形
が困難になる。
In the first invention, the extruded polystyrene foam board 2 held in a curved manner as described above is heated to soften it while maintaining the curve, and then cooled to form the extruded polystyrene foam board 2. Shape the warp. If the curvature retention is canceled before the curvature is fixed by heating, the curvature will normally occur within the bending elasticity range of the extruded polystyrene foam board 2, so the extruded polystyrene foam board 2 will return to its elastic state. This makes it impossible to form the necessary warp. Furthermore, if the curvature retention is canceled after heating and before cooling, part of the warp of the extruded polystyrene foam board 2 will return, making it difficult to form the desired warp.

」1記湾曲保持した押出法ポリスチレン系発泡板2の加
熱は、当該押出法ポリスチレン系発泡体を構成するポリ
スチレン系合成樹脂のガラス転移点未満の温度で加熱し
て行うことが好ましい。加熱温度が低いと、押出法ポリ
スチレン系発泡板2の軟化が不十分で、冷却後湾曲保持
を解除したときに、反りが弾性復帰しやすくなる。また
、押出法ポリスチレン系発泡体のように、非品性ポリマ
ーからなる発泡体は、明瞭なガラス転移点を示し、ガラ
ス転移点以上に加熱すると、熱力学的性質及び物理的性
質が急激に変化し、気泡が収縮して発泡体の体積が減少
する等によって、押出法ポリスチレン系発泡板2の有す
る基本的特性が損われるおそれがある。
1. It is preferable to heat the extruded polystyrene foam board 2 which is kept curved at a temperature lower than the glass transition point of the polystyrene synthetic resin constituting the extruded polystyrene foam. If the heating temperature is low, the extruded polystyrene foam board 2 will not be sufficiently softened, and the warp will tend to return elastically when the curvature retention is released after cooling. In addition, foams made of non-grade polymers, such as extruded polystyrene foams, exhibit a clear glass transition point, and when heated above the glass transition point, their thermodynamic and physical properties change rapidly. However, the basic characteristics of the extruded polystyrene foam board 2 may be impaired due to shrinkage of the cells and a decrease in the volume of the foam.

上記加熱は、押出法ポリスチレン系発泡板2全体をほぼ
均一に加熱軟化し得る時間行えば足る。
It is sufficient that the heating is carried out for a time that allows the entire extruded polystyrene foam board 2 to be heated and softened almost uniformly.

この時間は、押出法ポリスチレン系発泡板2の厚さや加
熱温度、前記治具1a 、lb 、lcの材質、厚み等
によっても多少異なるが、通常2時間以上であれば足る
This time varies somewhat depending on the thickness and heating temperature of the extruded polystyrene foam board 2, the material and thickness of the jigs 1a, lb, lc, etc., but usually 2 hours or more is sufficient.

加熱後の冷却は、押出法ポリスチレン系発泡板2が容易
に変形しない程度に固化されれば足るが、全体を室温程
度まで下げることが好ましい。
Cooling after heating is sufficient as long as the extruded polystyrene foam board 2 is solidified to the extent that it is not easily deformed, but it is preferable to cool the entire board to about room temperature.

また、この冷却は、自然放熱によっても、冷風の吹き付
は等の強制冷却によってもよい。
Further, this cooling may be performed by natural heat radiation or forced cooling such as by blowing cold air.

冷却後の削成は、通常電気カンナ等を用いて行われる。The cutting after cooling is usually performed using an electric planer or the like.

この削成によって必要な芯材の形状が形成されるもので
、押出法ポリスチレン板2に賦形されている反りの誤差
は、このとき修止することができる。
By this cutting, the necessary shape of the core material is formed, and any warping errors formed in the extruded polystyrene plate 2 can be corrected at this time.

第二発明においては、上記第一発明が押出法ポリスチレ
ン系発泡板2に反りを賦形してから削成しているのに対
し、ます平芯材を削成してからこれに反りを賦形する。
In the second invention, whereas in the first invention, the extruded polystyrene foam board 2 is warped and then shaved, the flat core material is shaved and then warped. Shape.

ここで、平芯材とは、製造すべき芯材の反りを延した形
状と同一の形状のものをいう。第二発明において、平芯
材に反りを賦形するために行うその湾曲保持並びに加熱
・冷却は、第一発明と同様にして行われるものである。
Here, the term "flat core material" refers to a material having the same shape as the shape of the core material to be manufactured by extending the warp. In the second invention, the curvature retention and heating/cooling performed to shape the flat core material into a warp shape are performed in the same manner as in the first invention.

次に、第三及び第四発明について説明する。Next, the third and fourth inventions will be explained.

第三及び第四発明において定められる押出法ポリスチレ
ン系発泡板の圧縮特性の配向比は、押出法ポリスチレン
系発泡板から芯材を製造するのに不可欠な削成を可能に
するための優れた機械的切削加工性を得るだめのもので
ある。即ち、厚み、幅、長さ方向の圧縮強さCV、CH
lC[が、全方向の圧縮強さの和C5LIHに対し、C
V/CSUM≧0.16、CHlCSUM≧0.16、
CF/CSUM≧0.16(7)全てを満し、好ましく
はCu/CSUM≧0.20、CHlCsu−≧0.2
0、CF/CsuM≧0.20の全てを満すことである
The orientation ratio of the compressive properties of the extruded polystyrene foam board defined in the third and fourth inventions provides an excellent machine for enabling the abrasion essential for manufacturing the core material from the extrusion polystyrene foam board. This is the only way to obtain the desired machinability. That is, the compressive strength in the thickness, width, and length directions CV, CH
lC[ is the sum of compressive strengths in all directions C5LIH, C
V/CSUM≧0.16, CHlCSUM≧0.16,
CF/CSUM≧0.16 (7) all satisfied, preferably Cu/CSUM≧0.20, CHlCsu-≧0.2
0, and CF/CsuM≧0.20.

ここでいう圧縮強さとは、JIS−A−9511の試験
法で測定した降伏点における圧縮強度をいう。また、降
伏点を有しない発泡体にあっては、その5%歪時の圧縮
強度をいう。
The compressive strength here refers to the compressive strength at the yield point measured by the test method of JIS-A-9511. In addition, for foams that do not have a yield point, it refers to the compressive strength at 5% strain.

−F記圧縮特性の配向比を特定する第三及び第四発明は
、本発明者等が1機械的切削加工性は当該発泡体の気泡
の配向比によって左右され、この気泡の配向比は圧縮特
性の配向比と密接な関係を有することを見出したことに
よってなされたものである。
-F The third and fourth inventions specifying the orientation ratio of compression characteristics are based on the present inventors' understanding that 1. Mechanical machinability is influenced by the orientation ratio of the cells in the foam, and the orientation ratio of the cells is determined by the compression property. This was made based on the discovery that there is a close relationship between the characteristics and the orientation ratio.

本発明者等の知見によれば、三次元方向への機械的切削
加工性を高めるには、気泡の配向比を、厚み、幅、長さ
の各方向に1:1:1、即ち等方性にすることが理想的
である。また、この気泡の配向比は、圧縮特性の配向比
と密接な関係を有し、圧縮特性の配向比がほぼ均一・の
ときには気泡の配向比もほぼ均一で、圧縮特性の配向比
の異方性が大きくなるにつれて気泡の配向比の異方性も
大きくなる。
According to the findings of the present inventors, in order to improve the mechanical machinability in three-dimensional directions, the orientation ratio of the bubbles should be set to 1:1:1 in each direction of thickness, width, and length, that is, isotropically. Ideally, it should be sexual. In addition, the orientation ratio of the bubbles has a close relationship with the orientation ratio of the compression characteristics, and when the orientation ratio of the compression characteristics is approximately uniform, the orientation ratio of the bubbles is also approximately uniform, and the orientation ratio of the compression characteristics is anisotropic. As the property increases, the anisotropy of the bubble orientation ratio also increases.

異方性の範囲がCυ/C9IIM、CHlCSUM、又
はCF/C3lI11のいずれかが0.16より小さい
場合、電気カンナ等を用いた機械的切削加工時にささく
れを生じやすくなり、サンドペーパー等による什りげ加
工の手間増大、これに伴なうコストアップ、表面塗装時
の塗布塗料量の増大等を招くことになる。
If any of the anisotropy ranges Cυ/C9IIM, CHlCSUM, or CF/C3lI11 is smaller than 0.16, hangnails are likely to occur during mechanical cutting using an electric planer, etc., and sagging with sandpaper, etc. This results in an increase in the amount of time and effort involved in the polishing process, an accompanying increase in costs, and an increase in the amount of paint applied during surface painting.

ところで、押出法により製造される発泡板は、型内発泡
により製造される発泡板と異なり、グイオリフィスを出
た後の溶融ゲルの三方向(厚さ、幅、長さ方向)への発
泡速度ベクトルが等しくならず、気泡の配向比に異方性
を生じるのが一般的である。この傾向は、第4図(a)
に示す通り、発泡板が比較的薄物(20〜50mm程度
)であるときにはあまり顕在化せず、等方性構造に近い
ものとなる。しかし、第4図(b)に示す通り、発泡板
の厚みが増すに従って、溶融ゲルの長さ方向への発泡速
度ベクトル交が低下し、逆に厚み方向への発泡速度ベク
トルtが増加する。従って、気泡が厚み方向に大きい楕
円形となり、異方性が強くなる。
By the way, foam boards manufactured by extrusion differ from foam boards manufactured by in-mold foaming in that the foaming speed of the molten gel in three directions (thickness, width, and length directions) after leaving the gas orifice is limited. Generally, the vectors are not equal, resulting in anisotropy in the bubble orientation ratio. This tendency is shown in Figure 4(a).
As shown in the figure, when the foam board is relatively thin (approximately 20 to 50 mm), it is not very noticeable and has an almost isotropic structure. However, as shown in FIG. 4(b), as the thickness of the foam plate increases, the foaming speed vector intersection of the molten gel in the length direction decreases, and conversely, the foaming speed vector t in the thickness direction increases. Therefore, the bubbles become large ellipses in the thickness direction, and the anisotropy becomes strong.

尚、第4図(a)及び(b)において、4は押出機で、
溶融ゲルの流れを実線で表わしている。
In addition, in FIGS. 4(a) and (b), 4 is an extruder,
The flow of the molten gel is represented by a solid line.

本発明においては、必要な強度を得るため、かなり厚手
の押出法ポリスチレン系発泡板を使用しており、−1−
記強い異方性を持ったものとなりやすい。そこで、本発
明で用いる押出法ポリスチレン系発泡板は、三方向への
配向をできるだけ均一にすべく、押出機の単位時間当り
の押出量を増加させること等によって、三方向への発泡
速度ベクトルをできるだけ等しくして押出発泡させたも
のが好ましい。
In the present invention, in order to obtain the necessary strength, a fairly thick extruded polystyrene foam board is used.
It tends to have strong anisotropy. Therefore, in order to make the extruded polystyrene foam board used in the present invention as uniform as possible in the three directions, the foaming speed vector in the three directions is adjusted by increasing the amount of extrusion per unit time of the extruder. It is preferable to extrude and foam them as equally as possible.

また、押出法ポリスチレン系発泡板は、芯材としたとき
に、良好な浮力性能、耐圧縮性及び意匠性を満足するた
めに、密度が20〜40kg/m3.平均気泡径が1.
0mm以下であることが必要である。密度が40kg/
m”を越えると既存の硬質ポリウレタン発泡体製のもの
と比較して軽量化のメリ・ントがなくなり、密度が20
kg/m3未満では、芯材として必要な耐圧縮性が得に
くくなる。
In addition, extruded polystyrene foam board has a density of 20 to 40 kg/m3 in order to satisfy good buoyancy performance, compression resistance, and design when used as a core material. The average bubble diameter is 1.
It is necessary that it is 0 mm or less. Density is 40kg/
If the weight exceeds 20 m, there will be no advantage of weight reduction compared to existing hard polyurethane foam products, and the density will decrease to 20 m.
If it is less than kg/m3, it becomes difficult to obtain the compression resistance required as a core material.

芯材は、通常FRP積層体で表面を補強されてサーフボ
ードやセールボードに仕−1−げられ、使用時に強く踏
み込まれたり飛びはねたとき等の局部荷重に対する耐圧
縮性の向上が図られる。しかし、芯材の耐圧縮性と、F
RP積層品の耐圧縮性は、はぼ比例関係を有し、FRP
層の割れを防止するだめには、芯材の耐圧縮強さが約1
.2kg/cm2以りであることが必要である。
The core material is usually reinforced on the surface with an FRP laminate and used in surfboards and sailboards to improve compression resistance against localized loads such as when the board is stepped on strongly or jumped during use. . However, the compression resistance of the core material and the F
The compression resistance of RP laminates has an approximately proportional relationship, and FRP
To prevent layer cracking, the compressive strength of the core material is approximately 1
.. It is necessary that it is 2 kg/cm2 or more.

ところで、発泡体の圧縮強さと密度はほぼ比例関係にあ
り、前記のように密度が20kg/m3以上であるとの
条件は、L記耐圧縮強さを得るためのものでもある。
By the way, the compressive strength and density of the foam are almost proportional to each other, and the above-mentioned condition that the density is 20 kg/m3 or more is also for obtaining the compressive strength indicated by L.

更に押出法ポリスチレン系発泡板の平均気泡径は、表面
塗装用塗料の塗布量増大に伴う重量化を防止し、かつ意
匠性を向上させるため、1.0mm以Fであることが必
要である。
Furthermore, the average cell diameter of the extruded polystyrene foam board needs to be 1.0 mm or more F in order to prevent the weight from increasing due to an increase in the amount of surface coating paint and to improve the design.

[作 用] 第−及び第二発明によれば、押出法ポリスチレン系発泡
板又は当該発泡板から削成した平芯材を、湾曲保持した
まま、加熱して軟化させることによって、湾曲させたこ
とによって生ずる曲げ応力を除去することができる。そ
して、加熱して軟化させた押出法ポリスチレン系発泡板
を、湾曲保持したまま冷却することによって、上記曲げ
応力の除去と相俟って、湾曲が固定され、所望の反りを
賦形できるものである。
[Function] According to the first and second inventions, the extruded polystyrene foam board or the flat core material cut from the foam board is heated and softened while maintaining the curve, thereby making it curve. The bending stress caused by this can be removed. Then, by cooling the extruded polystyrene foam board that has been heated and softened while maintaining its bending, the bending stress is removed, the bending is fixed, and the desired warp can be formed. be.

第一発明においては、上記反りの賦形後に芯材への削成
を行うため、反りの修正を後で行うこともでき、押出法
ポリスチレン系発泡板への反りの賦形に高精度を要しな
い利点がある。
In the first invention, since the core material is shaved after shaping the warp, the warpage can be corrected later, and high precision is required to shape the warp into the extruded polystyrene foam board. There are advantages to not doing so.

第二発明においては、平芯材への削或は、湾曲した板を
削成するより容易で、作業が行いやすい利点がある。
The second invention has the advantage that it is easier to perform the work than cutting a flat core material or cutting a curved plate.

第三及び第四発明においては、押出法ポリスチレン系発
泡板から芯材を製造するに必須の機械的切削加工時に、
良好な切削性を得ることができる。
In the third and fourth inventions, during the mechanical cutting process essential for manufacturing the core material from the extruded polystyrene foam board,
Good machinability can be obtained.

[実施例] 実施例1 第1図に示されるような治具を使用し、厚さ70mmの
押出法ポリスチレン発泡板への反りの賦形を行った。治
具で湾曲させて保持してからの加熱温度を、506C〜
100°Cの間で10°C毎に変え、各々冷却後の反り
量δ2を測定し、治具の反り量δ1との比δ2/δ1を
算出した。
[Example] Example 1 Using a jig as shown in FIG. 1, a warp was formed on an extruded polystyrene foam board having a thickness of 70 mm. The heating temperature after bending and holding with a jig is 506C ~
The temperature was changed every 10°C between 100°C, the amount of warpage δ2 after cooling was measured, and the ratio δ2/δ1 with the amount of warpage δ1 of the jig was calculated.

結果を第5図に示す。第5図から明らかなように、80
°C〜100℃の間で良好な反りの賦形がなされ、この
範囲で残留応力の除去が急速に進むことが分る。
The results are shown in Figure 5. As is clear from Figure 5, 80
It can be seen that good warping is achieved between °C and 100 °C, and that residual stress is rapidly removed within this range.

実施例2.比較例1 密度、平均気泡径、CV、CHlCFを変えた押出法ポ
リスチレン発泡板を試料とし、機械的切削加工性、軽量
性、耐圧縮性及び意匠性を、各々以下に示す評価法によ
って評価した結果を第1表に示す。
Example 2. Comparative Example 1 Extruded polystyrene foam boards with different density, average cell diameter, CV, and CHlCF were used as samples, and mechanical cutting workability, lightness, compression resistance, and design were evaluated using the evaluation methods shown below. The results are shown in Table 1.

イ)機械的切削加工性 試料表面を、電気カンナを用いて、切削深さ約1mm、
切削スピード約20cm/seeの条件で削った際の表
面状態を調べた。判定基準は下記の通りである。
b) Mechanically cut the surface of the sample to a depth of about 1 mm using an electric planer.
The surface condition was examined when cutting at a cutting speed of about 20 cm/see. The judgment criteria are as follows.

× □極端なささくれ状態、又は深さ5mm以上の窪み
が1ヶ以上発生。
× □Extreme hangnail condition, or one or more dents with a depth of 5 mm or more.

Δ □深さが2mII+以上5mm未満の窪みが1ヶ以
上発生。
Δ □One or more depressions with a depth of 2mII+ or more and less than 5mm have occurred.

O□ 深さが2mm未満の窪みが1ヶ以上発生。O□ One or more dents with a depth of less than 2 mm have occurred.

■ □ 表面荒れがほとんどなし。■ □ Almost no surface roughness.

rl)軽量性 判定基準は、本用途が浮力材として軽さを要求されるた
め、既存の硬質ポリウレタン発泡体(密度40〜50k
g/m3)を基準に発泡体の密度よりド記の様に判定し
た。
rl) Lightness criteria is based on the existing rigid polyurethane foam (density 40-50K), as this application requires lightness as a buoyancy material.
The density of the foam was determined based on the density (g/m3) as shown below.

× □ 密度45kg/l113以」二。× □ Density 45kg/l113 or more”2.

△ □ 密度35kg/m3以」−145kg/m”未
満。
△ □ Density 35 kg/m3 or more - less than 145 kg/m.

O□ 密度25kg/m”以上、35kg/+n”未満
O□ Density 25 kg/m" or more, less than 35 kg/+n".

■ □ 密度25kg/m3未満。■ □ Density less than 25kg/m3.

ハ)耐圧縮性 試料の厚み方向圧縮強さをJIS−A−9511の方法
により測定し、下記の様に判定した。(ij、 l、、
試料は製造後1力月以上放置したものを使用した。
c) Compression resistance The compressive strength in the thickness direction of the sample was measured according to the method of JIS-A-9511 and judged as follows. (ij, l,,
The samples used were those that had been left for one month or more after manufacture.

× □圧縮強度1.2kg/cm2未満。× □Compressive strength less than 1.2 kg/cm2.

Δ □圧縮強度1.2kg/cm2以−し、2.5kg
/cm2未満。
Δ □Compressive strength 1.2kg/cm2 or more, 2.5kg
less than /cm2.

○ □圧縮強度2.5kg/cm2以上、4.0kg/
cm2未満。
○ □Compressive strength 2.5kg/cm2 or more, 4.0kg/
Less than cm2.

■ □圧縮強度4kg/cm2以」−0二)意匠性 本用途では、芯材表面を水溶性塗料でペイントし、その
後ガラスクロスで補強した透明なエポキシ樹脂等でラミ
ネートする工法が一般的であり、意匠性の面より、芯材
の気泡径は小さいことが求められる。
■ □Compressive strength: 4kg/cm2 or more''-0 2) Design For this purpose, the common method is to paint the surface of the core material with water-soluble paint, and then laminate it with a transparent epoxy resin reinforced with glass cloth. From the viewpoint of design, the core material is required to have a small cell diameter.

× □ 気泡径1.0mm以上。× □ Bubble diameter 1.0mm or more.

Δ □ 気泡径0.6mm以上、1.0mm未満。Δ □ Bubble diameter of 0.6 mm or more and less than 1.0 mm.

O□ 気泡径0.4mm以北、0.6mm未満。O□ Bubble diameter north of 0.4 mm, less than 0.6 mm.

■ □気泡径0.4mm未満。■ □Bubble diameter less than 0.4mm.

ホ)総合評価 × □ 1ケ以上の×、又は2ヶ以上のΔがある場合。e) Overall evaluation × □ If there is one or more × or two or more Δ.

Δ □ ×、■の項目がなく、1ヶ以上の△がある場合
Δ □ If there is no × or ■ item and there is one or more △.

O□ ×の項1]がなく他の項目が全てO1或いは0の
項目が1ヶ以上ある場 合。
When there is one or more items in which there is no term 1 with O□ ×, and all other items are O1 or 0.

■ □ すべての項目でO4■である場合。■ □ If all items are O4■.

[発明の効果] 以上説明の通り、本発明によれば、軽量性、強度、非吸
水性及び意匠性の点で優れたものの得やすい押出法ポリ
スチレン系発泡板を用いてサーフボード又はセールボー
ド用芯材を簡単かつ材料の無駄なく製造でき、機能的に
優れたサーフボード又はセールボードを安価に提供する
ことが可能となるものである。
[Effects of the Invention] As explained above, according to the present invention, a core for surfboards or sailboards is produced using an extruded polystyrene foam board that is excellent in lightness, strength, non-water absorbency, and design but is easy to obtain. This makes it possible to manufacture surfboards or sailboards with excellent functionality at low cost by easily manufacturing materials without wasting materials.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は押出法ポリスチレン系発泡板を湾曲させて保持
する方法の一例を示す説明図、第2図は同、他の例を示
す説明図、第3図は反りを賦形した押出法ポリスチレン
系発泡板の説明図、第4図(a)、 (b)は各々異方
性の発生原因の説明図、第5図は実施例1の結果を示す
グラフである。
Fig. 1 is an explanatory drawing showing an example of a method for bending and holding an extruded polystyrene foam board, Fig. 2 is an explanatory drawing showing another example of the same, and Fig. 3 is an extruded polystyrene foam board with a warp shape. FIGS. 4(a) and 4(b) are illustrations of the causes of anisotropy, and FIG. 5 is a graph showing the results of Example 1.

Claims (1)

【特許請求の範囲】 1)押出法ポリスチレン系発泡板を、湾曲させ、これを
保持したまま、加熱した後冷却することによって湾曲を
固定し、その後芯材の形状に削成することを特徴とする
サーフボード又はセールボード用芯材の製造方法。 2)押出法ポリスチレン系発泡板を平芯材に削成し、こ
れを、湾曲させて保持したまま、加熱した後冷却するこ
とによって湾曲を固定することを特徴とするサーフボー
ド又はセールボード用芯材の製造方法。 3)厚み、幅、長さの各方向の圧縮強さC_V、C_H
、C_Eが、全方向の圧縮強さの和C_S_U_Mに対
し、下記(1)〜(3)式を満足する関係を持ち、かつ
平均気泡径が1.0mm以下、密度が20〜40kg/
m^3、厚みが70mm以上100mm未満の押出法ポ
リスチレン系発泡板であることを特徴とするサーフボー
ド用芯材の材料。 C_V/C_S_U_M≧0.16・・・・・(1) C_H/C_S_U_M≧0.16・・・・・(2) C_E/C_S_U_M≧0.16・・・・・(3) 4)厚み、幅、長さの各方向の圧縮強さC_V、C_H
、C_Eが、全方向の圧縮強さの和C_S_U_Mに対
し、下記(1)〜(3)式を満足する関係を持ち、かつ
平均気泡径が1.0mm以下、密度が20〜40kg/
m^3、厚みが100mm以上200mm以下の押出法
ポリスチレン系発泡板であることを特徴とするセールボ
ード用芯材の材料。 C_V/C_S_U_M≧0.16・・・・・(1) C_H/C_S_U_M≧0.16・・・・・(2) C_E/C_S_U_M≧0.16・・・・・(3)
[Claims] 1) The extruded polystyrene foam board is curved, heated and cooled while being held to fix the curve, and then cut into the shape of the core material. A method for manufacturing core material for surfboards or sailboards. 2) A core material for surfboards or sailboards, which is characterized by cutting an extruded polystyrene foam board into a flat core material, holding it in a curved state, heating it, and then cooling it to fix the curve. manufacturing method. 3) Compressive strength in each direction of thickness, width, and length C_V, C_H
, C_E has a relationship satisfying the following formulas (1) to (3) with respect to the sum of compressive strengths in all directions C_S_U_M, and the average cell diameter is 1.0 mm or less and the density is 20 to 40 kg/
m^3, a surfboard core material characterized by being an extruded polystyrene foam board having a thickness of 70 mm or more and less than 100 mm. C_V/C_S_U_M≧0.16 (1) C_H/C_S_U_M≧0.16 (2) C_E/C_S_U_M≧0.16 (3) 4) Thickness, width , compressive strength in each direction of length C_V, C_H
, C_E has a relationship satisfying the following formulas (1) to (3) with respect to the sum of compressive strengths in all directions C_S_U_M, and the average cell diameter is 1.0 mm or less and the density is 20 to 40 kg/
m^3, a material for a core material for a sailboard, characterized by being an extruded polystyrene foam board having a thickness of 100 mm or more and 200 mm or less. C_V/C_S_U_M≧0.16 (1) C_H/C_S_U_M≧0.16 (2) C_E/C_S_U_M≧0.16 (3)
JP61236330A 1986-10-06 1986-10-06 Production of core material for surfboard or saleboard and material of core material used therein Pending JPS6392368A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61236330A JPS6392368A (en) 1986-10-06 1986-10-06 Production of core material for surfboard or saleboard and material of core material used therein

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61236330A JPS6392368A (en) 1986-10-06 1986-10-06 Production of core material for surfboard or saleboard and material of core material used therein

Publications (1)

Publication Number Publication Date
JPS6392368A true JPS6392368A (en) 1988-04-22

Family

ID=16999207

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61236330A Pending JPS6392368A (en) 1986-10-06 1986-10-06 Production of core material for surfboard or saleboard and material of core material used therein

Country Status (1)

Country Link
JP (1) JPS6392368A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007500097A (en) * 2003-07-30 2007-01-11 ブラウアース スヴェン Exercise equipment for devices, especially surfing or the like
JP2016522307A (en) * 2013-06-20 2016-07-28 ダウ グローバル テクノロジーズ エルエルシー Smooth cutting polymer foam article

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60135439A (en) * 1983-12-20 1985-07-18 ザ ダウ ケミカル カンパニ− Manufacture of styrene polymer foamed body and foamed body thereby

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60135439A (en) * 1983-12-20 1985-07-18 ザ ダウ ケミカル カンパニ− Manufacture of styrene polymer foamed body and foamed body thereby

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007500097A (en) * 2003-07-30 2007-01-11 ブラウアース スヴェン Exercise equipment for devices, especially surfing or the like
JP2016522307A (en) * 2013-06-20 2016-07-28 ダウ グローバル テクノロジーズ エルエルシー Smooth cutting polymer foam article

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