JPH0197628A - Manufacture of synthetic resin net having curve - Google Patents

Manufacture of synthetic resin net having curve

Info

Publication number
JPH0197628A
JPH0197628A JP25441987A JP25441987A JPH0197628A JP H0197628 A JPH0197628 A JP H0197628A JP 25441987 A JP25441987 A JP 25441987A JP 25441987 A JP25441987 A JP 25441987A JP H0197628 A JPH0197628 A JP H0197628A
Authority
JP
Japan
Prior art keywords
powder
groove
polyethylene
mold
resin powder
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
JP25441987A
Other languages
Japanese (ja)
Inventor
Toshikazu Shinogaya
利和 篠ケ谷
Takuya Morooka
琢哉 諸岡
Haruo Koyama
小山 春雄
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.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP25441987A priority Critical patent/JPH0197628A/en
Publication of JPH0197628A publication Critical patent/JPH0197628A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the number of steps as well as the loss of material, by filling the groove of the lower die with resin powder, by fitting the beam of the upper die for welding in an integral body on heating under pressure, and by releasing the product from the cooled die for winding on the curved surface of a drum. CONSTITUTION:The lower die 1 has a mesh groove 2, and the upper die 3 has a mesh beam 4 fitted into the groove 2. The groove 2 of the lower die 1 is filled with polyethylene powder P of molecular weight 500,000-6,000,000. Next, the beam 4 of the upper die 3 is fitted into the groove 2 to compress the powder P up to 45-70%, and the upper and lower dies 1, 3 are raised in temperature to melt the powder P of the groove 2 for welding. Then, the dies 1, 3 are cooled to release the compression force, and the molding is taken out and immediately pressed on a cylindrical drum to cool down, resulting in formation of a curved surface. As multistage filling compression, the powder P is compressed by 10-50%, and the cavity space is filled again powder P after opening of the dies; then, the powder P is compressed by 10-60%.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、穀物の脱穀機用の綱や砂利、砕石等のふる
い網に適用して好適な合成樹脂製網の製造方法に関する
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a synthetic resin net suitable for use as a rope for a grain threshing machine or a sieving net for gravel, crushed stone, etc.

〔従来の技術〕[Conventional technology]

脱殻機等に使用されて脱粒、こなし、粗選別等を行う網
の大半は鋼線を素材とするものであり、錆び易いととも
に穀粒によって摩耗を受は易いことから耐久時間が約1
00時間程度しかなく、さらには湿った稲穂の処理を行
った場合に穂切れ、藁屑等が付着し易く、そのためにふ
るい目が目詰まりしてしまう等の欠点があった。そこで
、平均分子量が100万〜600万の超高分子量ポリエ
チレンを素材とする綱が開発された。超高分子量ポリエ
チレンは、耐摩耗性及び撥水性に優れているので、脱殻
機用のみならず鉱山機械や建設機械のふるい網やホンパ
ーのライニング材としての用途に適している。このよう
な合成樹脂製網の従来製造方法は、第9図に示すように
第1工程でポリエチレン粉末Pを平板成形金型100に
充填し、これを上金型101で加圧し所定の厚みを有す
る平板状の予備成形体を形成し、第2工程で予備成形体
を加圧加熱してポリエチレン粉末同士を融合せしめた後
に冷却して平板とする。第3工程としてこの平板を高温
の槽の中で半透明の溶融ゲル102とし、第4工程とし
てこの溶融ゲル102を網目状溝を有する金型103に
押付け(第10図参照)、冷却し、平板の表面に桟を型
付けし、第5工程として桟の部分をスライス、すなわち
厚み方向に直交するように水平にスライスして(第11
図2点鎖線参照)!4104を作っていた。さらに、こ
の網104を脱殻機に取付けるときは、たわませて円弧
状1こしなければならなかった。
Most of the nets used in shelling machines, etc. for shedding, processing, rough sorting, etc. are made of steel wire, and as they are easy to rust and are easily abraded by grains, their durability is approximately 1.
Furthermore, when wet ears of rice are processed, broken ears of rice, straw waste, etc. tend to adhere to the rice ears, resulting in clogging of the sieve. Therefore, a rope made of ultra-high molecular weight polyethylene with an average molecular weight of 1 million to 6 million was developed. Ultra-high molecular weight polyethylene has excellent abrasion resistance and water repellency, and is therefore suitable not only for use in shelling machines, but also as a lining material for sieve screens and ompers in mining and construction machinery. As shown in FIG. 9, in the conventional manufacturing method of such a synthetic resin net, in the first step, polyethylene powder P is filled into a flat plate molding die 100, and this is pressurized with an upper die 101 to obtain a predetermined thickness. In the second step, the preform is heated under pressure to fuse the polyethylene powders together, and then cooled to form a flat plate. As a third step, this flat plate is made into a translucent molten gel 102 in a high temperature tank, and as a fourth step, this molten gel 102 is pressed against a mold 103 having a mesh groove (see FIG. 10) and cooled. A crosspiece is molded on the surface of the flat plate, and the fifth step is slicing the crosspiece part, that is, slicing it horizontally perpendicular to the thickness direction (11th step).
(See the two-dot chain line in the figure)! I was making 4104. Furthermore, when this net 104 was attached to a shelling machine, it had to be bent into an arcuate shape.

〔解決しようとする問題点〕[Problem to be solved]

従来の製造方法では、工程が複雑になり、平板より残部
分をスライスするので材料ロスが多く、平板を加熱して
溶融ゲル102とする際に酸化劣化し、さらには冷却型
付け時にウェルドマークが発生する等の欠点があった。
In the conventional manufacturing method, the process is complicated, there is a lot of material loss because the remaining part is sliced from the flat plate, oxidation deterioration occurs when the flat plate is heated to form the molten gel 102, and weld marks occur during cooling molding. There were drawbacks such as:

また、円弧状にたわませる作業も面倒であった。Further, the work of bending it into an arc shape was also troublesome.

そこで、この発明は、工程を簡略化し、材料の無駄をな
くし、酸化劣化を防止して簡単に曲面を有する合成樹脂
製網を製造する方法を提供することを目的とする。
Therefore, an object of the present invention is to provide a method for easily manufacturing a synthetic resin net having a curved surface by simplifying the process, eliminating waste of materials, and preventing oxidative deterioration.

〔問題点を解決するための手段〕[Means for solving problems]

上述の目的を達成するため、第1の発明では、網目状の
溝を有する下金型とこれらの溝に嵌合する綱目状の桟を
有する上金型とを用意し、下金型の溝に分子量50万〜
600万のポリエチレン粉末が大半を占める樹脂粉末を
充填し、下金型の溝に上金型の桟を嵌合させて樹脂粉末
を45〜70%圧縮し、上下金型を嵌合させた加圧状態
でポリエチレンの融点以上に加熱してポリエチレン粉末
が大半を占める樹脂粉末を融着一体化し、次いで上下金
型を冷却して除圧後に融着一体化された製品を脱型し、
脱型された製品を半円筒状のドラムの曲面に巻き付け冷
却するものである。また、第2の発明では、網目状の溝
を有する下金型とこれらの溝に嵌合する網目状の桟を有
する上金型とを用意し、下金型の溝に分子150万〜6
00万のポリエチレン粉末が大半を占める樹脂粉末を充
填し、下金型の溝に上金型の桟を嵌合させて樹脂粉末を
10〜50%圧縮した後に型を開き再度下金型に樹脂粉
末を充填し下金型の溝部分に上金型の桟を嵌合させて樹
脂粉末を圧縮し、上下金型を嵌合させた加圧状態でポリ
エチレンの融点以上に加熱してポリエチレン粉末が大半
を占める樹脂粉末を融着一体化し、次いで上下金型を冷
却して除圧後に融着一体化された製品を脱型し更に脱型
された製品を半円筒状のドラムの曲面に巻き付け冷却す
る。
In order to achieve the above object, in the first invention, a lower mold having mesh-like grooves and an upper mold having mesh-like crosspieces that fit into these grooves are prepared, and the grooves of the lower mold are molecular weight of 500,000~
Filled with resin powder, the majority of which is polyethylene powder, and compressed the resin powder by 45 to 70% by fitting the crosspiece of the upper mold into the groove of the lower mold, and then fitting the upper and lower molds together. The resin powder, which is mostly polyethylene powder, is heated to a temperature higher than the melting point of polyethylene under pressure to fuse and integrate it, then the upper and lower molds are cooled, and after the pressure is removed, the fused and integrated product is demolded.
The demolded product is wrapped around the curved surface of a semi-cylindrical drum and cooled. Further, in the second invention, a lower mold having mesh-like grooves and an upper mold having mesh-like crosspieces that fit into these grooves are prepared, and molecules of 1.5 million to 6
After filling the resin powder, the majority of which is polyethylene powder, and compressing the resin powder by 10 to 50% by fitting the crosspiece of the upper mold into the groove of the lower mold, the mold is opened and the resin is poured into the lower mold again. The resin powder is filled with powder, the crosspiece of the upper mold is fitted into the groove of the lower mold, the resin powder is compressed, and the upper and lower molds are fitted under pressure and heated above the melting point of polyethylene to form the polyethylene powder. Most of the resin powder is fused and integrated, then the upper and lower molds are cooled, the pressure is removed, the fused and integrated product is demolded, and the demolded product is wrapped around the curved surface of a semi-cylindrical drum and cooled. do.

〔作用〕[Effect]

この発明では、工程数を減少させしかも材料の無駄をな
くして曲面を有する合成樹脂製網を容易に製造し得る。
According to the present invention, a synthetic resin net having a curved surface can be easily manufactured by reducing the number of steps and eliminating waste of materials.

〔実施例〕〔Example〕

以下にこの発明の好適な実施例を図面を参照にして説明
する。
Preferred embodiments of the present invention will be described below with reference to the drawings.

第1図に示す下金型1は網目状の溝2を有し、上金型3
はこれらの溝2に嵌合する網目状の桟4を有する。この
ように構成された上下金型1,3を用意し、下金型1の
網目状の溝2に分子量50万〜600万のポリエチレン
粉末Pを充填する。
The lower mold 1 shown in FIG. 1 has a mesh-like groove 2, and the upper mold 3
has mesh-like crosspieces 4 that fit into these grooves 2. The upper and lower molds 1 and 3 configured as described above are prepared, and the mesh grooves 2 of the lower mold 1 are filled with polyethylene powder P having a molecular weight of 500,000 to 6,000,000.

ポリエチレン粉末Pを充填する量は、溝2の深さ一杯に
行い、場所による充填量の違いをなくすことが好ましい
。超高分子量ポリエチレンは、溶融時の流動性が極端に
悪いため、充填量のばらつきは成形品の密度の差やウェ
ルドマーク発生の原因となるが、溝2の深さ一杯に充填
するならばこのような欠点を解消することができる。ポ
リエチレン粉末Pを充填する工程においては、振動式の
フィーダーを使用したり、下金型2自体を振動させるこ
とにより、より均一な充填を達成することができる。ま
た、ポリエチレン粉末Pの充填時の下金型1の温度は、
ポリエチレンの軟化温度以下で行い70〜130℃の範
囲が好ましい。130℃以上ではポリエチレン粉末が徐
々に軟化し粉末同志が粘着しブロック状になるのでキャ
ビティへの充填が不均一になり易い。このようにしてポ
リエチレン粉末Pを下金型1の溝2に充填したならば、
上金型3の桟4を溝2に嵌合しポリエチレン粉末Pを加
圧する。この加圧は、第1の発明においては、ポリエチ
レン粉末Pを45〜70%圧縮するように加圧する。こ
の工程における圧縮率は、圧縮した容積/キャビティの
容積、の比率とする。
It is preferable that the amount of polyethylene powder P is filled to the full depth of the groove 2 to eliminate differences in the amount of filling depending on location. Ultra-high molecular weight polyethylene has extremely poor fluidity when melted, so variations in the filling amount will cause differences in the density of the molded product and the occurrence of weld marks, but if it is filled to the full depth of groove 2, this Such shortcomings can be overcome. In the step of filling the polyethylene powder P, more uniform filling can be achieved by using a vibrating feeder or by vibrating the lower mold 2 itself. Furthermore, the temperature of the lower mold 1 when filling the polyethylene powder P is as follows:
It is preferably carried out at a temperature below the softening temperature of polyethylene, preferably in the range of 70 to 130°C. At 130° C. or higher, the polyethylene powder gradually softens and the powders stick together and form a block, which tends to result in uneven filling of the cavity. If the polyethylene powder P is filled into the groove 2 of the lower mold 1 in this way,
The crosspiece 4 of the upper mold 3 is fitted into the groove 2, and the polyethylene powder P is pressurized. In the first invention, this pressurization is applied so as to compress the polyethylene powder P by 45 to 70%. The compression rate in this step is the ratio of compressed volume/cavity volume.

上金型3の桟4が溝2内に嵌合してポリエチレン粉末P
を圧縮すると、ポリエチレン粉末2間に内包される空気
が追い出され、次の工程におけるポリエチレン融着体の
熱膨張及びさらに次の工程におけるポリエチレン融着体
の収縮に追従するためには好ましくは50%以上圧縮実
るのが良い。また、圧縮の速度はポリエチレン粉末2間
の空気を追い出すために出来るだけ遅くする。特に成形
品が肉厚の場合には遅く行う必要がある。通常は1〜1
0mm/分程度の住縮速度である。また、圧縮工程の最
終圧力は50〜300kg/cdである。
The crosspiece 4 of the upper mold 3 fits into the groove 2, and the polyethylene powder P
When compressed, the air contained between the polyethylene powders 2 is expelled, and in order to follow the thermal expansion of the polyethylene fused body in the next step and the contraction of the polyethylene fused body in the next step, it is preferably 50%. It's good to have more compressed fruit. In addition, the speed of compression is made as slow as possible in order to expel air between the polyethylene powders 2. Particularly if the molded product is thick, it is necessary to perform the process slowly. Usually 1-1
The contraction speed is about 0 mm/min. Moreover, the final pressure of the compression process is 50 to 300 kg/cd.

このように第3図に示す工程が終了した後、次の工程で
は上下金型1.3を昇温し、キャビティ(溝2)内のポ
リエチレン粉末Pを溶融し粉末同士を融合させる。この
時の最高温度は少なくとも超高分子量ポリエチレンの融
点以上とする0通常150℃以上にすることにより実用
性能を得る゛ことができるが、ポリエチレン粉末P同士
の融着度を更に改良する意味では170℃以上とし、2
50℃以内で成形することが好ましい。次いで、上下金
型1.3を冷却し圧縮力を解除、即ち上金型3を上昇さ
せた後、成形品を取り出す。圧縮力を解除する温度は超
高分子量ポリエチレンの融点以下とする。融点以上で除
圧した場合には、成形品の表面に収縮によりヒケなどを
生ずる。通常、除圧及び脱型は130℃〜70℃の温度
で行われる。
After the process shown in FIG. 3 is thus completed, in the next process, the upper and lower molds 1.3 are heated to melt the polyethylene powder P in the cavity (groove 2) and fuse the powders together. The maximum temperature at this time should be at least higher than the melting point of ultra-high molecular weight polyethylene.Usually, practical performance can be obtained by setting the temperature to 150°C or higher, but in order to further improve the degree of fusion between polyethylene powders P, 170°C ℃ or higher, 2
It is preferable to mold at a temperature of 50°C or less. Next, the upper and lower molds 1.3 are cooled and the compression force is released, that is, the upper mold 3 is raised, and then the molded product is taken out. The temperature at which the compressive force is released is below the melting point of ultra-high molecular weight polyethylene. If the pressure is removed above the melting point, shrinkage will occur on the surface of the molded product due to shrinkage. Usually, depressurization and demolding are carried out at a temperature of 130°C to 70°C.

成形品を溝2から取り出す方法は、上金型3の桟4にダ
ルマピンを配置し、成形品を上金型3に付けて引き上げ
る。或は、上金型3の桟4にアンダーカットを付けて成
形品を引き上げる。或はまた下金型1の溝2側より突き
出して取り出す等の方法がある。
To take out the molded product from the groove 2, a Daruma pin is placed on the crosspiece 4 of the upper mold 3, and the molded product is attached to the upper mold 3 and pulled up. Alternatively, an undercut is made on the crosspiece 4 of the upper mold 3 and the molded product is pulled up. Alternatively, there is a method of protruding from the groove 2 side of the lower mold 1 and taking it out.

脱型された成形品は直ちに円筒状のドラム5の曲面上に
押し付けられ冷却されることによって曲面が形成される
(第7図参照)。第8図は成型された網を示している。
The demolded molded product is immediately pressed onto the curved surface of the cylindrical drum 5 and cooled to form a curved surface (see FIG. 7). Figure 8 shows the molded net.

第2の発明では、上金型3の桟4を溝2に嵌合しポリエ
チレン粉末Pを最初に加圧するときの加圧は、ポリエチ
レン粉末Pを10〜50%圧縮するように加圧する。こ
の工程における圧縮率は、圧縮した容積/キャビティの
容積、の比率とする。
In the second invention, when the crosspiece 4 of the upper mold 3 is fitted into the groove 2 and the polyethylene powder P is first pressurized, the pressure is applied so as to compress the polyethylene powder P by 10 to 50%. The compression rate in this step is the ratio of compressed volume/cavity volume.

次いで金型を開き押し固められたポリエチレン粉末の上
に出来たキャビティ内空間に、再びポリエチレン粉末P
を充填する。再び上金型3の桟4を下金型の溝2内に嵌
合させポリエチレン粉末を圧縮する。圧縮率は10〜6
0%程度であり、第1回目の充填圧縮の比率によって変
わるが充填した粉末の嵩体積の2回合針分が2回の圧縮
によって40〜70%圧縮されるように決められる。
Next, the mold is opened and polyethylene powder P is poured again into the cavity space created above the compacted polyethylene powder.
Fill it. The crosspiece 4 of the upper mold 3 is again fitted into the groove 2 of the lower mold to compress the polyethylene powder. Compression rate is 10-6
Although it varies depending on the ratio of the first filling and compression, it is determined that the bulk volume of the filled powder is compressed by 40 to 70% in the two compressions.

この多段充填圧縮法の第1の利点はキャビティ内の粉末
の充填を均一化できる点であり、この結果充填不足によ
る低密度化を回避することが出来る。また他の利点とし
ては、キャビティの深さを浅くすることが出来る点であ
る。通常キャビティ深さは成形品の厚さの2倍以上必要
とするが多段で充填する方法では1.5倍の深さのキャ
ビティで良いことになる。このことは成形後製品を取り
出し易くしている。
The first advantage of this multistage filling and compression method is that the powder filling in the cavity can be made uniform, and as a result, low density due to insufficient filling can be avoided. Another advantage is that the depth of the cavity can be reduced. Normally, the cavity depth needs to be at least twice the thickness of the molded product, but in the multi-stage filling method, the cavity can be 1.5 times as deep. This makes it easy to take out the product after molding.

圧縮の速度はポリエチレン粉末2間の空気を追い出すた
めに出来るだけ遅くする。特に成形品が肉厚の場合には
遅く行う必要がある0通常は1〜1(1m/分程度の圧
縮速度である。また、圧縮工程の最終圧力は50〜30
0 kg/c+(である。
The speed of compression is made as slow as possible to expel air between the polyethylene powders 2. Especially when the molded product is thick, it is necessary to perform the compression process slowly. Usually the compression speed is 1 to 1 (about 1 m/min).The final pressure of the compression process is 50 to 30 m/min.
0 kg/c+(.

このように第6図に示す工程が終了した後、次の工程で
は上下金型1.3を昇温し、キャビティ(溝2)内のポ
リエチレン粉末Pを溶融し粉末同士を融合させる。この
時の最高温度は少なくとも超高分子量ポリエチレンの融
点以上とする。通常150℃以上にすることにより実用
性能を得ることができるが、ポリエチレン粉末P同士の
融着度を更に改良する意味では170℃以上とし、25
0℃以内で成形することが好ましい。次いで、上下金型
1.3を冷却し圧縮力を解除、即ち上金型3を上昇させ
た後、成形品を取り出す。圧縮力を解除する温度は超高
分子量ポリエチレンの融点以下とする。融点以上で除圧
した場合には、成形品の表面に収縮によりヒケなどを生
ずる。通常、除圧及び脱型は130℃〜70℃の温度で
行われる。
After the steps shown in FIG. 6 are completed in this way, the next step is to raise the temperature of the upper and lower molds 1.3 to melt the polyethylene powder P in the cavity (groove 2) and fuse the powders together. The maximum temperature at this time is at least higher than the melting point of ultra-high molecular weight polyethylene. Normally, practical performance can be obtained by heating the temperature to 150°C or higher, but in order to further improve the degree of fusion between the polyethylene powders P, the temperature should be set to 170°C or higher.
It is preferable to mold at a temperature of 0°C or less. Next, the upper and lower molds 1.3 are cooled and the compression force is released, that is, the upper mold 3 is raised, and then the molded product is taken out. The temperature at which the compressive force is released is below the melting point of ultra-high molecular weight polyethylene. If the pressure is removed above the melting point, shrinkage will occur on the surface of the molded product due to shrinkage. Usually, depressurization and demolding are carried out at a temperature of 130°C to 70°C.

成形品を溝2から取り出す方法は、上金型3の桟4にダ
ルマピンを配置し、成形品を上金型3に付けて引き上げ
る。或は、上金型3の桟4にアンダーカプトを付けて成
形品を引き上げる。或はまた下金型1の溝2側より突き
出して取り出す等の方法がある。
To take out the molded product from the groove 2, a Daruma pin is placed on the crosspiece 4 of the upper mold 3, and the molded product is attached to the upper mold 3 and pulled up. Alternatively, an undercap is attached to the crosspiece 4 of the upper mold 3 and the molded product is pulled up. Alternatively, there is a method of protruding from the groove 2 side of the lower mold 1 and taking it out.

脱型された成形品は直ちに円筒状のドラム5の曲面上に
押し付けられ冷却されることによって曲面が形成される
(第7図参照)。第8図は成形された網を示している。
The demolded molded product is immediately pressed onto the curved surface of the cylindrical drum 5 and cooled to form a curved surface (see FIG. 7). Figure 8 shows the formed mesh.

コンバインのふるい網においては曲面状のフレームに取
り付けて使用されるので網目体を曲面成形することはフ
レームへの取付性を良好なものとしている。
Since the sieve net of a combine harvester is used by being attached to a curved frame, forming the mesh body into a curved surface improves the ease of attachment to the frame.

この発明において使用する超高分子量ポリエチレンは、
分子量が50万以上、特に100万〜600万のものが
好適である。もちろん、超高分子量ポリエチレンは、分
子量の異なるグレードをブレンドして用い−でもよいし
、他の添加成分として分子量3万〜30万のポリエチレ
ンや更に低分子量のパラフィンなどを含むものであって
も良い。
The ultra-high molecular weight polyethylene used in this invention is
Those with a molecular weight of 500,000 or more, particularly 1 million to 6 million, are preferred. Of course, the ultra-high molecular weight polyethylene may be used as a blend of grades with different molecular weights, or may contain polyethylene with a molecular weight of 30,000 to 300,000 or even lower molecular weight paraffin as other additive components. .

図示する実施例では、深さ10Mmの網目状溝2を有す
る下金型1に超高分子量ポリエチレン(分子量450万
)の粉末Pを溝2の深さ一杯に充填し、高さ5fiの網
目状様4を有する上金型3を徐々に下金型1に押し込ん
だ。この時の圧縮率は50%であった。加圧力は100
.kg/aaとした。
In the illustrated example, a lower mold 1 having a mesh groove 2 with a depth of 10 mm is filled with powder P of ultra-high molecular weight polyethylene (molecular weight 4.5 million) to the full depth of the groove 2, and a mesh groove with a height of 5 fi is filled. The upper mold 3 having the shape 4 was gradually pushed into the lower mold 1. The compression ratio at this time was 50%. Pressure force is 100
.. kg/aa.

圧縮汲上下金型1.3を加熱し、200℃まで昇温し、
引き続いてエアープローL100℃まで冷却し、加圧力
を除いて成形品を取り出した。その後室温のドラム状に
布ベルトで押しつけ15分空冷した。その結果、曲面を
有する超高分子量ポリエチレン製の均一な網10を得た
Heat the compression pumping upper and lower molds 1.3 and raise the temperature to 200℃,
Subsequently, the air blower L was cooled to 100° C., the pressure was removed, and the molded product was taken out. Thereafter, it was pressed onto a drum at room temperature with a cloth belt and cooled in the air for 15 minutes. As a result, a uniform net 10 made of ultra-high molecular weight polyethylene and having a curved surface was obtained.

〔効果〕〔effect〕

以上説明したように、この発明では従来の如く一旦網目
のない平板な成形品を作る必要がなく、しかもこの平板
な成形品に網目を後から形成する必要もないために、工
程数が減少し、材料ロスも少な(、酸化劣化する虞れも
ない。また、冷却して型付け時を行う必要もないために
ウェルドマークの発生も防止することができ、容易かつ
安価に合成樹脂製網を製造することができる。更には、
粉末で下金整品溝に充填するために内部歪みも小さく、
寸法安定性も優れる。特に、この発明では、予め曲面に
成形されるので脱殻機等への取付けが容易な網を簡単に
製造することができる。
As explained above, in this invention, there is no need to create a flat molded product without mesh as in the past, and there is no need to form a mesh on this flat molded product afterwards, so the number of steps is reduced. There is little material loss (there is no risk of oxidation deterioration. Also, there is no need for cooling and molding, so weld marks can be prevented, and synthetic resin nets can be easily and inexpensively manufactured. In addition,
Because the powder is used to fill the grooves for preparing the lower metal, internal distortion is small.
It also has excellent dimensional stability. In particular, according to the present invention, since the net is preformed into a curved surface, it is possible to easily manufacture a net that can be easily attached to a dehulling machine or the like.

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

第1図はこの発明において使用する上下金型を示す断面
図、第2図は下金型に樹脂粉末を充填した状態を示す断
面図、第3図は圧縮工程を示す断面図、第4図は上金型
上昇後の断面図、第5図は第4図の状態においてさらに
樹脂粉末を充填した状態の断面図、第6図は再度の圧縮
工程を示す断面図、第7図はドラム取付け状態の説明図
、第8図は成形品の斜視図、第9図は従来方法において
使用される上下金型を示す断面図、第10図は従来方法
による型付け工程を示す断面図、第11図はスライスさ
れる従来の成形品を示す斜視図である。 l・・・下金型、 2・・・溝、 3・・・上金型、 4・・・桟、 P・・・ポリエチレン粉末、 10・・・網。 第 1 ダ 第 3!2+ 第 4 図 IF5  ロ 貴 711FI
Figure 1 is a sectional view showing the upper and lower molds used in this invention, Figure 2 is a sectional view showing the lower mold filled with resin powder, Figure 3 is a sectional view showing the compression process, and Figure 4. Figure 5 is a cross-sectional view of the upper mold after it has been raised, Figure 5 is a cross-sectional view of the state shown in Figure 4, with resin powder further filled in, Figure 6 is a cross-sectional view showing the re-compression process, and Figure 7 is a drum installation. An explanatory diagram of the state, FIG. 8 is a perspective view of the molded product, FIG. 9 is a sectional view showing the upper and lower molds used in the conventional method, FIG. 10 is a sectional view showing the molding process by the conventional method, and FIG. 11 FIG. 2 is a perspective view showing a conventional molded product to be sliced. L: Lower mold, 2: Groove, 3: Upper mold, 4: Crosspiece, P: Polyethylene powder, 10: Net. 1st Da 3!2+ 4th Figure IF5 Loki 711FI

Claims (1)

【特許請求の範囲】 1、網目状の溝を有する下金型とこれらの溝に嵌合する
網目状の桟を有する上金型とを用意し、下金型の溝に分
子量50万〜600万のポリエチレン粉末が大半を占め
る樹脂粉末を充填し、下金型の溝に上金型の桟を嵌合さ
せて樹脂粉末を45〜70%圧縮し、 上下金型を嵌合させた加圧状態でポリエチレンの融点以
上に加熱してポリエチレン粉末が大半を占める樹脂粉末
を融着一体化し、 次いで上下金型を冷却して除圧後に融着一体化された製
品を脱型し、脱型された製品を半円筒状のドラムの曲面
に巻き付け冷却することを特徴とする曲面を有する合成
樹脂網の製造方法。 2、網目状の溝を有する下金型とこれらの溝に嵌合する
網目状の桟を有する上金型とを用意し、下金型の溝に分
子量50万〜600万のポリエチレン粉末が大半を占め
る樹脂粉末を充填し、下金型の溝に上金型の桟を嵌合さ
せて樹脂粉末を10〜15%圧縮した後に型を開き再度
下金型に樹脂粉末を充填し下金型の溝部分に上金型の桟
を嵌合させて樹脂粉末を10〜60%圧縮し、上下金型
を嵌合させた加圧状態でポリエチレンの融点以上に加熱
してポリエチレン粉末が大半を占める樹脂粉末を融着一
体化し、 次いで上下金型を冷却して除圧後に融着一体化された製
品を脱型し、脱型された製品を半円筒状のドラムの曲面
に巻き付け冷却することを特徴とする曲面を有する合成
樹脂網の製造方法。
[Claims] 1. Prepare a lower mold having mesh-like grooves and an upper mold having mesh-like crosspieces that fit into these grooves. The resin powder is filled with resin powder, the majority of which is polyethylene powder, and the resin powder is compressed by 45 to 70% by fitting the crosspiece of the upper mold into the groove of the lower mold, and then pressurized by fitting the upper and lower molds. The molds are then heated above the melting point of polyethylene to fuse and integrate the resin powder, which is mostly polyethylene powder.Then, the upper and lower molds are cooled, the pressure is removed, and the fused and integrated product is demolded. A method for producing a synthetic resin net having a curved surface, which comprises wrapping the product around the curved surface of a semi-cylindrical drum and cooling it. 2. Prepare a lower mold having mesh-like grooves and an upper mold having mesh-like crosspieces that fit into these grooves, and place most of the polyethylene powder with a molecular weight of 500,000 to 6 million in the grooves of the lower mold. After compressing the resin powder by 10 to 15% by fitting the crosspiece of the upper mold into the groove of the lower mold, the mold is opened and the lower mold is again filled with resin powder, and the lower mold is filled with resin powder. The resin powder is compressed by 10 to 60% by fitting the crosspiece of the upper mold into the groove part, and heated to above the melting point of polyethylene under pressure with the upper and lower molds fitted, so that the majority of the resin powder becomes polyethylene powder. The resin powder is fused and integrated, then the upper and lower molds are cooled, the pressure is removed, the fused and integrated product is demolded, and the demolded product is wrapped around the curved surface of a semi-cylindrical drum and cooled. A method for producing a synthetic resin network having a characteristic curved surface.
JP25441987A 1987-10-08 1987-10-08 Manufacture of synthetic resin net having curve Pending JPH0197628A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25441987A JPH0197628A (en) 1987-10-08 1987-10-08 Manufacture of synthetic resin net having curve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25441987A JPH0197628A (en) 1987-10-08 1987-10-08 Manufacture of synthetic resin net having curve

Publications (1)

Publication Number Publication Date
JPH0197628A true JPH0197628A (en) 1989-04-17

Family

ID=17264715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25441987A Pending JPH0197628A (en) 1987-10-08 1987-10-08 Manufacture of synthetic resin net having curve

Country Status (1)

Country Link
JP (1) JPH0197628A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8683582B2 (en) 2008-06-16 2014-03-25 Qualcomm Incorporated Method and system for graphical passcode security

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8683582B2 (en) 2008-06-16 2014-03-25 Qualcomm Incorporated Method and system for graphical passcode security

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