JPS5914324B2 - Manufacturing method for gypsum molded products - Google Patents
Manufacturing method for gypsum molded productsInfo
- Publication number
- JPS5914324B2 JPS5914324B2 JP12775078A JP12775078A JPS5914324B2 JP S5914324 B2 JPS5914324 B2 JP S5914324B2 JP 12775078 A JP12775078 A JP 12775078A JP 12775078 A JP12775078 A JP 12775078A JP S5914324 B2 JPS5914324 B2 JP S5914324B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- slurry
- water
- female mold
- mold
- 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
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Description
【発明の詳細な説明】
この発明はプレス加工によって石こう成形品を製造する
方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a gypsum molded article by press working.
一般に、石こう成形品を製造するには、主としてα型ま
たはβ型の半水石こうに骨材などを混入してなる石こう
配合物を、水に投入してスラリーを形成し、これを鋳型
に注入して凝結硬化させるいわゆる流し込み成形法が行
われている。Generally, in order to manufacture gypsum molded products, a gypsum compound consisting mainly of α-type or β-type hemihydrate gypsum mixed with aggregate, etc. is poured into water to form a slurry, and this is poured into a mold. A so-called pour molding method is used in which the material is then solidified and hardened.
しかしこの方法では、スラリーの凝結硬化に長時間を要
するため、大量生産を行うには多数の型が必要となった
。However, with this method, it takes a long time to solidify and harden the slurry, so a large number of molds are required for mass production.
またスラリーは徐々に凝結硬化するため保管ができず、
さらに上記のように多数の型を用いた場合、すべての型
においてスラリーの粘度を均一なものとすることは困難
であった。In addition, the slurry cannot be stored because it gradually solidifies and hardens.
Furthermore, when a large number of molds were used as described above, it was difficult to make the viscosity of the slurry uniform in all the molds.
このようなことから、石こう製品の成形はどうしてもバ
ッチ方式によらざるを得す、連続成形は困難であった。For these reasons, molding of gypsum products has to be done in batches, and continuous molding has been difficult.
この発明は、上記のような実情に鑑みてなされたもので
あって、凝結硬化時間を短縮することにより、連続成形
が可能な新規石こう成形品の製造法を提供するものであ
る。This invention was made in view of the above-mentioned circumstances, and provides a method for producing a new gypsum molded product that can be continuously molded by shortening the setting and hardening time.
なお、この明細書において、部はすべて重量部を表わす
。In this specification, all parts represent parts by weight.
この発明による石こう成形品の製造法は、粉状の半水石
こうと水をそれぞれ所要量ずつ用意し、これら石こうお
よび水のうち少なくとも一方に粉状の凝結促進剤を添加
する第1工程と、前記半水石こうまたはこれと凝結促進
剤との配合粉を雌型に投入する第2工程と、雌型内の投
入物に前記凝結促進剤含有または非含有水を注いで浸透
させ、スラリーを形成する第3工程と、雌型に上方から
雄型を配し、これら型の間にスラリーが均一に拡がるよ
うに型押を行い、スラリーを凝結させる第4工程とから
なる。The method for producing a gypsum molded article according to the present invention includes a first step of preparing required amounts of powdered hemihydrate gypsum and water, and adding a powdered setting accelerator to at least one of the gypsum and water; A second step of charging the hemihydrate gypsum or a mixed powder of it and a setting accelerator into a female mold, and pouring the water containing or not containing a setting accelerator into the material in the female mold to infiltrate it to form a slurry. and a fourth step of placing a male die on the female die from above, pressing the slurry so that it spreads uniformly between the two dies, and condensing the slurry.
第1工程において、凝結促進剤の例としては、硫酸カリ
ウム、硫酸ナトリウム、硫酸アンモニウム、塩化ナトリ
ウム、硝酸カリウム、塩化アンモニウム、水酸化カリウ
ム等が挙げられる。In the first step, examples of the setting accelerator include potassium sulfate, sodium sulfate, ammonium sulfate, sodium chloride, potassium nitrate, ammonium chloride, potassium hydroxide, and the like.
その添加量は、促進剤の種類により異なるが、後述する
第4工程の終了時にスラリーの凝結が完了するように決
定される。The amount added varies depending on the type of accelerator, but is determined so that the coagulation of the slurry is completed at the end of the fourth step described below.
たとえば、凝結促進剤として硫酸カリウムを用いた場合
、予備試験により添加量と凝結硬化時間の関係を求める
と、表1に示す結果を得る(β型半水石こう100部十
水85部)。For example, when potassium sulfate is used as a setting accelerator, the relationship between the amount added and setting hardening time is determined by a preliminary test, and the results shown in Table 1 are obtained (100 parts of β-type hemihydrate gypsum and 85 parts of water).
同様に、他の凝結促進剤についても添加量と凝結硬化時
間の関係を求める予備試験を行う。Similarly, preliminary tests are conducted for other setting accelerators to determine the relationship between the amount added and the setting and hardening time.
そしてこれらの関係と後述する第4工程の型押開始まで
の時間とを考慮して各凝結促進剤の添加量を決定する。The amount of each setting accelerator to be added is determined in consideration of these relationships and the time until the start of embossing in the fourth step, which will be described later.
通常、半水石こうには骨材が添加される。骨材としては
、製品の重量、強度、価格等を考慮して、川砂、ガラス
ピーズ、パーライト、各種繊維等が用いられる。Typically, aggregate is added to hemihydrate gypsum. As the aggregate, river sand, glass peas, perlite, various fibers, etc. are used, taking into consideration the weight, strength, price, etc. of the product.
川砂を用いる場合には、石こう100部に対し川砂30
0部を越えると、製品がもろくなり好ましくない。When using river sand, add 30 parts of river sand to 100 parts of gypsum.
If it exceeds 0 parts, the product will become brittle and undesirable.
水の量は骨材の種類および量により異なるが、α型石こ
う100部に対して40部、β型石こう100部に対し
て70部がそれぞれ最低量である。The amount of water varies depending on the type and amount of aggregate, but the minimum amount is 40 parts for 100 parts of α-type gypsum and 70 parts for 100 parts of β-type gypsum.
第2工程は常法による。The second step is carried out by a conventional method.
第3工程において、スラリーの形成は、水を含んだ雌型
投入物を静置または攪拌することによりなされる。In the third step, the slurry is formed by standing or stirring the water-containing female charge.
水の浸透時間は、骨材の種類、量等により変る。Water penetration time varies depending on the type and amount of aggregate, etc.
投入配合物がβ型半水石こう100部と川砂200部か
らなる場合についての例を挙げると次のとおりである。An example of a case where the input composition consists of 100 parts of β-type hemihydrate gypsum and 200 parts of river sand is as follows.
したがって種々の割合からなる配合物について、それぞ
れ予備試験を行い、層の高さと浸透時間の関係を把握し
ておき、これと前記凝結促進剤による凝結硬化時間とを
考慮して、静置および攪拌のいずれの手段を採択するか
を決定する。Therefore, we conduct preliminary tests on formulations with various proportions to understand the relationship between layer height and penetration time, and then, taking into account this and the setting and hardening time due to the setting accelerator, we conduct preliminary tests on formulations with various proportions. Decide which method to adopt.
第4工程において、スラリーが1対の型の間に均一に拡
がるようにするためには、1対の型のうちいずれか一方
を揺動させてやるとよい。In the fourth step, in order to spread the slurry uniformly between the pair of molds, it is preferable to rock one of the pair of molds.
図面は、この発明の方法を連続的に実施する操作例を示
すものである。The drawings show an example of a continuous implementation of the method of the invention.
図中1はエンドレスコンベヤで、この上には型を支持す
る多数の型支持枠2が取付けられている。In the figure, reference numeral 1 denotes an endless conveyor, on which a number of mold support frames 2 for supporting molds are attached.
3は雌型供給装置、4は同装置3から供給されて支持枠
2に支持された雌型、5は雌型支持台、6は雌型供給装
置3の進行方向前方に配置された配合粉末自動秤量投下
器で、ここから石こうおよび骨材の配合物が所要量ずつ
雌型4内に投下される。3 is a female mold supply device, 4 is a female mold supplied from the device 3 and supported on the support frame 2, 5 is a female mold support stand, and 6 is a blended powder arranged in front of the female mold supply device 3 in the direction of movement. An automatic weighing dispenser from which the required amount of gypsum and aggregate mixture is dispensed into the female mold 4.
7は配合粉末自動秤量投下器6の前方に配置された液体
自動秤量投下器で、ここから水が所要量ずつ雌型4内に
投下される。Reference numeral 7 denotes a liquid automatic weighing and dropping device disposed in front of the mixed powder automatic weighing and dropping device 6, from which water is dropped into the female mold 4 in required amounts.
8は液体自動秤量投下器の前方に配置された攪拌器で、
スラリー形成に攪拌が必要な場合に用いられる。8 is a stirrer placed in front of the automatic liquid weighing and dropping device.
Used when stirring is required to form a slurry.
9は攪拌器8の前方に配置された雄型供給装置で、ここ
から雌型4の上に雄型10が供給さえる。Reference numeral 9 denotes a male die feeding device disposed in front of the stirrer 8, from which the male die 10 is fed onto the female die 4.
11は雄型供給装置9の前方に配置された加圧機で、雄
型10を所要圧力で所要時間押圧する。Reference numeral 11 denotes a pressurizer disposed in front of the male mold supply device 9, which presses the male mold 10 at a required pressure for a required period of time.
12は加圧機11による圧力を受けて型を支持する受台
、13は型付きの石こう成形品、14は支持枠2から脱
離した成形品13を系外に搬出するベルトコンベヤであ
る。12 is a pedestal that supports the mold under pressure from the pressurizer 11; 13 is a plaster molded product with a mold; and 14 is a belt conveyor that carries the molded product 13 detached from the support frame 2 out of the system.
次に、この発明の実施例を従来例と比較して示す。Next, an example of the present invention will be shown in comparison with a conventional example.
上記表3中、方法(3)(4)は配合物と水を予め混合
してスラリーを形成し、これをプレス成形する方法であ
る。In Table 3, methods (3) and (4) are methods in which the compound and water are mixed in advance to form a slurry, and the slurry is press-molded.
同表かられかるように、実施例の方法(1)(2)の場
合には、従来例を示す方決(3)(4)の場合に比べて
凝結硬化時間を大巾に短縮することができる。As can be seen from the table, in the case of methods (1) and (2) of the example, the setting and hardening time can be greatly shortened compared to the methods (3) and (4) of the conventional example. Can be done.
実施例 2
実施例1における(2)および(4)の方法により、そ
れぞれ径110mm、厚さ51rLm1高さ25朋の射
撃用標的皿を成形した。Example 2 By methods (2) and (4) in Example 1, shooting target plates each having a diameter of 110 mm, a thickness of 51 rLm, and a height of 25 mm were molded.
なお、方法(2)の場合、雌型内の配合粉の層の高さは
約1.5CrfLであり、水の注入から静置までの時間
は15秒であり、型押、離型にいたる時間は4分であっ
た。In addition, in the case of method (2), the height of the layer of mixed powder in the female mold is approximately 1.5CrfL, and the time from water injection to standing still is 15 seconds, leading to embossing and mold release. The time was 4 minutes.
これに対し、方法(4)の場合には、配合物の投入から
攪拌、流人込み、型押、離型にいたる時間は21分であ
った。On the other hand, in the case of method (4), the time from adding the compound to stirring, pouring, embossing, and demolding was 21 minutes.
こうして得られた各標的皿について、物性を測定したと
ころ、重量50gの落球による衝撃強度はいずれも高さ
20cIrLであった。When the physical properties of each target plate thus obtained were measured, the impact strength due to a falling ball weighing 50 g was 20 cIrL in height.
以上の次第で、この発明による石こう製品の製造法にお
いては、雌型にまず半水石こうまたはその配合物を投入
し、つぎに水を注入してスラIJ −を形成し、この状
態で型押しを行うので、スラリーは雌型内で生成されて
そのままプレス成型に供され、したがってスラリーの保
存管理が全く必要でない上に、スラリー粘度を常時均一
に保持して成型を行うことができる。As described above, in the method for manufacturing a gypsum product according to the present invention, hemihydrate gypsum or a mixture thereof is first poured into the female mold, water is then poured into the mold to form a slurry IJ-, and in this state, the mold is pressed. As a result, the slurry is produced in the female mold and used for press molding as it is, so there is no need to store the slurry at all, and the slurry can be molded while maintaining a uniform viscosity at all times.
また半水石こうおよび水のうち少なくとも一方には凝結
促進剤を添加しであるので、石こうの凝結硬化時間を大
巾に短縮することができ、したがって少ない金型で連続
生産を行うことができる。Furthermore, since a setting accelerator is added to at least one of the hemihydrate gypsum and water, the setting and hardening time of the gypsum can be greatly shortened, and continuous production can therefore be carried out using fewer molds.
図面は成形装置を概略的に示す側面図である。 The drawing is a side view schematically showing the molding device.
Claims (1)
、これら石こうおよび水のうち少なくとも一方に粉状の
凝結促進剤を添加する工程と、前記半水石こうまたはこ
れと凝結促進剤との配合粉を雌型に投入する工程と、雌
型内の投入物に前記凝結促進剤含有または非含有水を注
いで浸透させ、スラリーを形成する工程と、雌型に上方
から雄型を配し、これら型の間にスラリーが均一に拡が
るように型押を行い、スラリーを凝結させる工程とから
なる石こう成形品の製造法。1. A step of preparing required amounts of powdered hemihydrate gypsum and water, adding a powdered setting accelerator to at least one of these gypsum and water, and combining the hemihydrate gypsum or this with the setting accelerator. A step of charging the blended powder into a female mold, a step of pouring the water containing or not containing a setting accelerator into the material in the female mold and infiltrating it to form a slurry, and placing a male mold into the female mold from above. A method for manufacturing gypsum molded products, which consists of the steps of stamping the slurry so that it spreads uniformly between these molds, and condensing the slurry.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12775078A JPS5914324B2 (en) | 1978-10-16 | 1978-10-16 | Manufacturing method for gypsum molded products |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12775078A JPS5914324B2 (en) | 1978-10-16 | 1978-10-16 | Manufacturing method for gypsum molded products |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5553513A JPS5553513A (en) | 1980-04-19 |
JPS5914324B2 true JPS5914324B2 (en) | 1984-04-04 |
Family
ID=14967750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12775078A Expired JPS5914324B2 (en) | 1978-10-16 | 1978-10-16 | Manufacturing method for gypsum molded products |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5914324B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5855362A (en) * | 1981-09-30 | 1983-04-01 | 凸版印刷株式会社 | Manufacture of transfer printed dressing board |
JPH07112689B2 (en) * | 1989-01-13 | 1995-12-06 | 株式会社トクヤマ | Molding device for hardened cement |
DE4008084A1 (en) * | 1990-03-14 | 1991-09-19 | Pro Mineral Ges | METHOD FOR PRODUCING PLASTER PANELS, ESPECIALLY OF FLOOR PLATES |
US6398864B1 (en) * | 1999-11-30 | 2002-06-04 | United States Gypsum Company | Pottery plaster formulations for the manufacture of plaster molds |
-
1978
- 1978-10-16 JP JP12775078A patent/JPS5914324B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5553513A (en) | 1980-04-19 |
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