JPS6115726A - Method for preventing caking of particulate material - Google Patents

Abstract

PURPOSE:To avoid the caking of a particulate material easy to cake by uniformly adhering a slight amount impurities adhered to the particulate material to the surface thereof to prevent the direct contact of particles, by applying stirring treatment to the particulate material prior to storing or packing said particulate material. CONSTITUTION:Stirring treatment is applied to a particulate material easy to cake such as an inorg. substance, for example, salt or magnesium chloride, an org. substance, for example, urea and foods or food materials prior to storing or packing the particulate material. In this case, stirring is not limited to a usual concept for performing stirring merely by a stirrer and, for example, stirring treatment, such that the particulate material is allowed to fill a drum and stirred by a screw, may be taken. By this method, in an angular particulate material, friction action is generated between particles by stirring treatment and corners of the particulate material are slightly rounded off and the pressure at the contact points between particles are markedly reduced and caking is hardly generated.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、例えば食塩、塩化マグネシウム等の無機物、
尿素等の有機物さらには食品等固結しやすい流体の固結
を防止する方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to inorganic substances such as common salt and magnesium chloride;
The present invention relates to a method for preventing the caking of organic substances such as urea, as well as fluids that are prone to caking, such as foods.

従来の技術 粒体は、その構成する物質の種類および粒度の大小によ
り差異はあるが、一般に時間の一過にともない、また粒
体に作用する圧力により、粒子間の接□点で結合が生じ
、総体的に固結現象をおこす。粒体商品はその貯蔵にお
いて、固結が生じると商品価値が著しく減少し、また、
包装を開いても粒体が出雌くなる不都合がある。Conventional technology Granules differ depending on the type of substance they are composed of and the size of the particles, but in general, over time and due to pressure acting on the granules, bonds occur at the points of contact between the particles. , causing a general caking phenomenon. When granular products are stored, their commercial value decreases significantly when caking occurs, and
There is an inconvenience that even when the package is opened, the granules come out.

特に最近では、粒体の空気輸送が多くなり、その固結現
象は大きな問題となっている。Particularly in recent years, air transport of particles has increased, and the caking phenomenon has become a big problem.

粒体を貯蔵のため、サイロや小ツバ−類に入れることが
通常行なわれるが、時間の経過に伴ない、ブリッヂ現□
象をおこし、粒体の排出ができなくなることがしばしば
みられるが、このブリッヂ現象も固結現象の一つである
。Granules are usually placed in silos or small containers for storage, but as time passes, bridge currents
This bridging phenomenon is also one of the caking phenomena.

かかる粒体の固結現象の解明およびその対策は従来多々
行なわれてきたが、完全な解決策は見当らず、場合場合
に応じてその場に適した解決策をとっているのが現状で
ある。Although many efforts have been made to elucidate the phenomenon of solidification of particles and take countermeasures against it, no perfect solution has been found, and the current situation is to take solutions that are appropriate for each situation. .

例えば細かい粉末で、しかも被覆力の強い物質を混合し
て粒体の表面を覆い、粒体間の接触をできるだけ回避す
る方法とか、炭酸カルシウム、ケイ酸カルシウム、第二
燐酸ソーダ類等の固結防止剤を混合し、固結を防止する
方法とかがある。For example, a method of mixing fine powder with a substance with strong covering power to cover the surface of the granules and avoiding contact between the granules as much as possible, or caking of calcium carbonate, calcium silicate, dibasic sodium phosphate, etc. There is a method to prevent caking by mixing an inhibitor.

又、固結は吸湿、放湿現象の繰り返しにより大きく助長
されることから、水分を通さない袋に包装する方法もあ
る。Furthermore, since caking is greatly facilitated by repeated moisture absorption and moisture release phenomena, there is also a method of packaging the material in a bag that does not allow moisture to pass through.

サイロやパン均一中での粉体のブリッヂ硯象に対しては
、振動装置をサイロやバンカーに設置し、一定時間毎に
又は貯蔵物を排出するときに、サイロやバンカーの壁に
振動を与え、ブリッヂを解除する方法がとられている。To prevent bridge formation of powder in a silo or pan, a vibrating device is installed in the silo or bunker to vibrate the wall of the silo or bunker at regular intervals or when discharging stored materials. , a method is used to release the bridge.

発明が解決しようとする問題点 上記従来の技術は、粒体の固結防止上完全な解決策とは
言えない。例えば粒体に固結防止剤を混合する場合は、
異物質を混入することになるので粒体物質の純度が落ち
る欠点があるし、粒体が食品又は食品原料の場合は、固
結防止剤も食品と共に体内にとり入れられることとなる
ので自ら制限を受ける。Problems to be Solved by the Invention The above-mentioned conventional techniques cannot be said to be a complete solution for preventing caking of particles. For example, when mixing an anti-caking agent into granules,
This has the disadvantage of reducing the purity of the granular material because foreign substances are mixed in, and if the granular material is a food or food raw material, the anti-caking agent is also taken into the body along with the food, so there are limits to this. receive.

又、不透湿性の材料を用いてなる包装袋に入れる場合は
、一般に包装コストが高くなり経済的でない。In addition, when packaging the product in a packaging bag made of moisture-impermeable material, the packaging cost generally increases and is not economical.

振動装置をつける方法については、振動装置自身の価格
もさることながら、とりつけるサイロやバンカーも振動
に耐え得るだ【プの強度をもたせる必要があり、その設
備費は馬鹿に・ならないし、又、振動が大きい場合は、
粒体が粒子間で移動を起こし、粒子の大小の間で層分離
を起こす欠点がある。Regarding the method of attaching a vibrating device, in addition to the price of the vibrating device itself, the silo or bunker to which it is attached also needs to be strong enough to withstand vibrations, and the equipment cost is not prohibitive. If the vibration is large,
There is a drawback that the particles move between particles and layer separation occurs between large and small particles.

問題点を解決するための手段 本発明は、固結防止剤等の添加剤を一切使用することな
く粒体の固結防止を達成するもので、固結しやすい粒体
を貯蔵または包装する前に、該粒体に攪拌処理を施すこ
とを特徴とする粒体の固結防止法である。Means for Solving the Problems The present invention achieves prevention of caking of granules without using any additives such as anti-caking agents. A method for preventing caking of granules is characterized in that the granules are subjected to a stirring treatment.

固結しやすい粒体としては、前述のように例えば食塩、
塩化マグネシウム等の無機物、尿素等の有機物その他食
品、食品原わ１があり、場合によっては混合組成物の場
合もある。As mentioned above, examples of granules that are easy to solidify include table salt,
These include inorganic substances such as magnesium chloride, organic substances such as urea, other foods, and food raw materials, and in some cases, they may be mixed compositions.

ここで攪拌とは、単に撹拌棒で攪拌する通常の観念に止
まらず、例えばドラムに粒体を詰めて、ドラムを回転さ
せてもよいし、又スクリューににり粒体を攪拌処理して
もよい。Stirring here is not limited to the usual concept of simply stirring with a stirring rod; for example, the granules may be packed in a drum and rotated, or the granules may be agitated using a screw. good.

作　　　用 本発明のもたらす固結防止機構については、今のところ
明確に解明するに至っていないが、粒体の形状が角ばっ
たものでは、攪拌処理により粒子相互間の摩耗作用が生
じ、僅がではあるが角がとれ、粒体間接触点での圧力が
著しく緩和され、固結が生じ難くなると考えられ、さら
に粒体に付着する僅かの不純物が攪拌処理により生じる
該粒体よりも非常に細かい粉体と混合し、粒体の表面に
一様に付着し覆うため、粒体の直接の接触がなくなり、
固結が回避されるものと考えられる。また、固結が始ま
る極めて初期の段階で攪拌処理を施し固結を解除してし
まうと、次は同じ固結開始点が会合する確立が低くなり
、もはや固結し難くなるとも想定される。Effect The anti-caking mechanism provided by the present invention has not yet been clearly elucidated, but in the case of angular particles, abrasion between the particles occurs due to the agitation process, resulting in slight caking. However, the edges are smoothed, and the pressure at the contact point between the particles is significantly relaxed, making it difficult for caking to occur.Furthermore, the slight impurities that adhere to the particles are much finer than the particles produced by the stirring process. It mixes with the powder and uniformly adheres to and covers the surface of the granules, eliminating direct contact with the granules.
It is believed that caking is avoided. It is also assumed that if agitation treatment is performed at an extremely early stage of caking to release caking, the probability that the same caking starting points will meet next time will be low, making caking no longer possible.

実施例 粒径の細かい食塩ｉ　ｏｏｏｇを用意し、その粒度を篩
で調べ、ロジンーラムラー線図にプロットしたところ、
該食塩の平均粒径（Ｒ５０％）は１４４μｍ　、標準偏
差（Ｓ）は２２．３、ｎ（ｔａｎα）は３．０５あった
。Example: We prepared common salt iooog with a fine particle size, examined its particle size with a sieve, and plotted it on a Rosin-Rammler diagram.
The average particle diameter (R50%) of the salt was 144 μm, the standard deviation (S) was 22.3, and n (tan α) was 3.05.

次にこの食塩的５００ｇをとり径１５０ｍ１ｌｌ　、長
さ２００１ＩＩＩＩｌのドラムに入れ、４５分間回転、
振動させることにより、充分攪拌処理を施した。Next, take 500g of this salt, put it in a drum with a diameter of 150ml and a length of 2001IIIl, and rotate for 45 minutes.
Sufficient stirring treatment was performed by vibrating.

処理した試料をとり出し、処理を施さない試料と拡大鏡
で２０倍に拡大して比較したが、粒体の形状には目視で
きる差異が認められなかった。A treated sample was taken out and compared with an untreated sample under 20x magnification using a magnifying glass, but no visible difference was observed in the shape of the particles.

次に固結の難易を調べるための加速試験として、両試料
各１０ｇを採り、アムスラー成型機で１５０に！ＩＩ／
Ｃｍ２の圧ノコをかけ、径２０ｍｍ１高さ約２０ｍｍの
円板に成型し、次いで該テストピースを本屋式硬度計で
破壊強度を求めた結果につき、処理しない試料を基に比
をとったところ、その比は０．２８であった。Next, as an accelerated test to check the difficulty of solidification, 10g of each sample was taken and made into 150g with an Amsler molding machine! II/
A pressure saw of cm2 was used to mold the test piece into a disk with a diameter of 20 mm and a height of about 20 mm, and then the fracture strength of the test piece was determined using a bookstore type hardness meter.The results were compared based on the untreated sample. The ratio was 0.28.

すなわち、攪拌処理を施したものは処理しないものより
固結麿が約１／３弱に減少することが認められた。しか
も粒子が均一分布していた。That is, it was observed that the amount of solidified grains in the agitation-treated product was reduced to about 1/3 of that in the untreated product. Furthermore, the particles were uniformly distributed.

次に本実施例の各測定値を表にまとめ記載＝６− する。Next, each measured value of this example is summarized in a table and described = 6- do.

ここで破壊弾痕が３ｋ（１／ｃ１以上のものは固結とし
、３ｋＧ／ｃｍ２未満は指先で軽く崩れ、一般に使用上
さして問題はないので固結とはみなされない。Here, if the fracture bullet hole is 3K (1/c1 or more), it is considered to be solidified, and if it is less than 3kG/cm2, it crumbles easily with a fingertip, and generally there is no problem in use, so it is not considered to be solidified.

発明の効果 本発明によれば、攪拌処理という簡単な方法で粒体の固
結が緩和防止できる。そして攪拌処理は普通の方法であ
るから、特殊な設漏を要しないので、設備費は比較的少
なくて済み、操作も容易である。Effects of the Invention According to the present invention, caking of granules can be prevented from relaxing by a simple method of stirring treatment. Since the agitation process is a common method and does not require any special installation or leakage, equipment costs are relatively low and operation is easy.

又、添加剤を一切加えないので製品の純度を損なうこと
がなく、特に粒体が食品の場合には添加物による健康障
害のおそれは全くない。Furthermore, since no additives are added, the purity of the product is not impaired, and especially when the granules are used as food, there is no risk of health problems due to additives.

本発明による処理前後の粒体の形状を拡大鏡で観察した
ところ、特に大きな差異がみられず、粒体の特性を変え
ずに固結防止が達成できる。When the shapes of the granules before and after the treatment according to the present invention were observed with a magnifying glass, no major differences were observed, and caking prevention can be achieved without changing the properties of the granules.

Claims (1)

【特許請求の範囲】 固結しやすい粒体を貯蔵または包装する前 に、該粒体に攪拌処理を施すことを特徴とする粒体の固
結防止法。[Scope of Claims] A method for preventing caking of granules, which comprises subjecting the granules that tend to clump to agitation treatment before storing or packaging the granules.