JPS636482B2 - - Google Patents
Info
- Publication number
- JPS636482B2 JPS636482B2 JP56133551A JP13355181A JPS636482B2 JP S636482 B2 JPS636482 B2 JP S636482B2 JP 56133551 A JP56133551 A JP 56133551A JP 13355181 A JP13355181 A JP 13355181A JP S636482 B2 JPS636482 B2 JP S636482B2
- Authority
- JP
- Japan
- Prior art keywords
- dry ice
- molded product
- roll press
- molding
- molding cavity
- 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
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 19
- 235000011089 carbon dioxide Nutrition 0.000 claims description 17
- 238000000465 moulding Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Carbon And Carbon Compounds (AREA)
Description
【発明の詳細な説明】
この発明は粉粒状のドライアイスから所望の形
状と寸法を有するドライアイスを成形する方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming dry ice having a desired shape and dimensions from powdered dry ice.
冷却剤として用いられるドライアイスは、最近
の用途拡大に伴つて種々の形態のものが要求され
るようになり、大25cm角の立方体のものから小は
ペレツト状のものまで市販されており、これらの
うち、５cm角以上の方形のものは油圧プレスで、
ペレツト状のものは押出機でそれぞれ造られてい
る。 Dry ice, which is used as a cooling agent, has recently expanded in use and is now required to come in various forms. Among them, square ones with a size of 5 cm square or more are made using a hydraulic press.
Each pellet is made using an extruder.
一方、需要の面からは、上記の寸法以外に例え
ば３cm角や４cm角のドライアイスを要求してくる
場合があり、このようなときには、大形のブロツ
クに造られたドライアイスを鋸で平板状に切削
し、これを所望寸法の巾で角棒状に切断したのち
サイコロ状に裁断する方法が採られていた。とこ
ろが、このような作業は工程が多くて繁雑である
だけでなく、高速に走行する鋸で小さい寸法まで
裁断するので危険度が高く、また裁断面積が大き
いため切削による重量損失も大きいなどの不都合
な点があつた。 On the other hand, in terms of demand, there are cases where dry ice with dimensions other than the above dimensions, such as 3 cm square or 4 cm square, is requested. The method used was to cut the material into a square shape, cut it into a rectangular bar shape with a desired width, and then cut it into dice shapes. However, this type of work is not only complicated and involves many steps, but also highly dangerous as it involves cutting into small dimensions with a saw running at high speed, and the cutting area is large, resulting in a large weight loss due to cutting. There was a hot spot.
この発明の目的は、小寸法のドライアイスを安
全かつ効率的に得るための成形方法を提供するに
ある。この目的を達成するために、本発明者ら
は、粉粒状のドライアイスを、ロールプレスの曲
面に穿設された成形空所に押込んで所望大のドラ
イアイスを成形することを試みた。その結果、原
料ドライアイスをロールプレスに圧入して成形す
る段階において、ロールプレスの温度条件が室温
に近いスタート直後からしばらくの間はスムース
に成形品が得られるが、ロールプレスの成形空所
の壁が原料ドライアイスで冷やされて次第に温度
が低下し、−40℃より低くなると、得られる成形
品にひびが生じ、それが原因でロールプレスから
落下するとき或は取り扱いの過程に於いて成形品
が割れる現象が認められた。本発明はこのような
知見にもとづくもので、以下これを添付の図面に
ついて説明する。 An object of the present invention is to provide a molding method for safely and efficiently obtaining small-sized dry ice. In order to achieve this objective, the present inventors attempted to mold dry ice of a desired size by forcing dry ice in powder form into a molding cavity bored in the curved surface of a roll press. As a result, at the stage of press-fitting raw material dry ice into a roll press and forming it, a molded product can be obtained smoothly for a while immediately after the start when the temperature condition of the roll press is close to room temperature. When the wall is cooled with raw dry ice and the temperature gradually decreases below -40°C, the resulting molded product will crack, causing it to crack when falling from the roll press or during the handling process. A phenomenon in which the product cracked was observed. The present invention is based on this knowledge, and will be explained below with reference to the accompanying drawings.
図面は本発明実施装置の１例を示したもので、
１は粉粒状原料ドライアイス（以下単に原料とい
う）の貯留用ホツパ、２はその下部に設けられた
スクリユフイーダ、３はその下に連接された各個
別に対応する所定の形状、寸法を有する成形空所
３ａを曲面に穿設した等速で回転する１対のドラ
ムから成り、且つドラム相互間の押付圧力が可変
のロールプレスである。ホツパ１に供給される原
料は、目的の成形品と同程度ないしはそれ以下の
粒度とくに成形品の1/2以下の粒度であることが
望しく、その分布については問わない。原料粒度
があまり大きいと成形製品のバリが肥厚して外観
を損じたり、昇華速度が非定常な製品となつたり
し、反対にあまり小さいと製品の硬度が低下する
などの不都合を生ずる。原料はホツパ１からスク
リユフイーダ２に入る。このフイーダ２は後続の
ロールプレス３の成形能力に見合う物量を供給す
るとともに、原料をロールプレス３に適正な力で
押付ける役目をする。押付力が強すぎると成形品
のバリが肥厚したり、成形品に異常な歪を与えて
製品にひびが入る原因となり、反面あまり弱すぎ
ると組織の粗な強度の低い製品しか得られない。
スクリユフイーダ２から押出された原料はロール
プレス３に成形空所３ａに押込まれる。ロールプ
レス３のドラム間圧力は、成形品の面にかかる圧
力が約50Kg／cm2〜約500Kg／cm2望ましくは約100
Kg／cm2〜約300Kg／cm2になるように調整するのが
よい。即ち、この圧力が高すぎると成形品にひび
割れが生じたり、反面、低すぎると強度の低いや
わらかな成形品になつたりする。成形空所３ａは
一方のドラムまたは双方のドラムに夫々対応する
ように周方向に沿つて１〜数列穿設され、その形
状は製品が自重で剥離落下しうる形状であれば半
球形、半円柱形、丸、角四形等いずれでもよい。
夫々のドラムには内部に加熱装置（図示省略）た
とえば電熱器を設け、これによりドラム本体ひい
ては成形空所の壁の温度を適温に保てるようにす
る。成形空所の壁の温度はこの加熱装置で少なく
とも−40℃以上、望ましくは−10℃〜−25℃とな
るようにする。この場合、加温は熱エネルギーの
消費量からしても又原料の昇華ロスを防除する意
味でもあまり強くすることは好ましくないが反
面、温度が低すぎると前述したように成形品にひ
び割れが入る。ロールプレス３から剥離落下した
成形品はカバー４の底部から取出される。図中５
は昇華した二酸化炭素ガスを排出する排気管であ
る。 The drawing shows an example of the device implementing the present invention.
1 is a hopper for storing powdery dry ice (hereinafter simply referred to as raw material), 2 is a screw feeder provided below the hopper, and 3 is a molding cavity having a predetermined shape and dimensions corresponding to each one connected below the hopper. This roll press consists of a pair of drums that rotate at a constant speed with holes 3a formed in a curved surface, and the pressing pressure between the drums is variable. The raw material supplied to the hopper 1 preferably has a particle size comparable to or smaller than that of the target molded product, particularly 1/2 or less of the particle size of the molded product, and its distribution is not critical. If the particle size of the raw material is too large, the burrs of the molded product will thicken and spoil the appearance, and the sublimation rate will be unsteady.On the other hand, if the particle size is too small, problems such as a decrease in the hardness of the product will occur. The raw materials enter Scryufida 2 from Hoppa 1. This feeder 2 serves to supply an amount of material commensurate with the molding capacity of the subsequent roll press 3 and to press the raw material against the roll press 3 with an appropriate force. If the pressing force is too strong, the burrs on the molded product will thicken, or it will give abnormal distortion to the molded product, causing cracks in the product.On the other hand, if the pressing force is too weak, only a product with a coarse structure and low strength will be obtained.
The raw material extruded from the screw feeder 2 is pushed into a forming cavity 3a by a roll press 3. The pressure between the drums of the roll press 3 is such that the pressure applied to the surface of the molded product is approximately 50Kg/ cm2 to approximately 500Kg/cm2, preferably approximately 100Kg/ cm2 .
It is best to adjust it so that it is between Kg/cm 2 and approximately 300Kg/cm 2 . That is, if this pressure is too high, cracks will occur in the molded product, while if it is too low, the molded product will be soft and have low strength. One to several rows of molding cavities 3a are bored along the circumferential direction so as to correspond to one drum or both drums, respectively, and the shape is hemispherical or semicylindrical if the product can peel off and fall under its own weight. It can be any shape, round, rectangular, etc.
Each drum is provided with a heating device (not shown), such as an electric heater, in order to maintain the temperature of the drum body and thus the walls of the molding cavity at an appropriate temperature. The temperature of the walls of the molding cavity is controlled by this heating device to at least -40°C or higher, preferably -10°C to -25°C. In this case, it is not desirable to increase the heating too much in terms of thermal energy consumption and to prevent sublimation loss of raw materials, but on the other hand, if the temperature is too low, the molded product will crack as described above. . The molded product that has peeled off and fallen from the roll press 3 is taken out from the bottom of the cover 4. 5 in the diagram
is an exhaust pipe that exhausts sublimated carbon dioxide gas.
この発明は、従来の油圧プレスで得られる比較
的大形のもの、および押出機で得られる小形のも
のの中間に相当する寸法のドライアイスを成形す
るのに適しており、しかもこの方法によれば安全
でかつ効率的に成形ドライアイスを連続して得る
ことができる。 The present invention is suitable for molding dry ice with a size that is between the relatively large size obtained using a conventional hydraulic press and the small size obtained using an extruder, and furthermore, according to this method, Shaped dry ice can be continuously obtained safely and efficiently.
以下、実施例および比較例により本発明の実施
態様および効果を具体的に説明するが、本発明は
この実施例に限定されるものではない。 Hereinafter, embodiments and effects of the present invention will be specifically explained with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.
実施例および比較例
図面に示したような装置（成形空所：縦横40
mm、深さ10mm）を利用した。粒度20mm以下の粉粒
状ドライアイスを前記装置に供給し、スクリユー
フイーダーの回転数30rpm、ロールプレスの回転
数2.6rpm、ロールプレスのドラム間圧力は成形
品の面圧で160Kg、ｆ／cm2となるように調整し、
かつ成形空所壁温を−20℃±５℃に保つようにド
ラムを加温して成形を行つた。その結果、色、つ
や、硬度共に良好な縦横約40mm、厚さ約20mmの枕
形の成形ドライアイスを連続して得ることができ
た。Examples and Comparative Examples A device as shown in the drawing (molding space: 40 mm in length and width)
mm, depth 10 mm). Powdered dry ice with a particle size of 20 mm or less is supplied to the device, the rotation speed of the screw feeder is 30 rpm, the rotation speed of the roll press is 2.6 rpm, and the pressure between the drums of the roll press is 160 kg, f/cm, which is the surface pressure of the molded product. Adjust so that it is 2 ,
Molding was carried out by heating the drum so as to maintain the wall temperature of the molding cavity at -20°C±5°C. As a result, we were able to continuously obtain pillow-shaped molded dry ice with good color, gloss, and hardness, about 40 mm in length and width and about 20 mm in thickness.
次いでドラムの加温をやめて成形を続けた所、
成形空所壁温が低下し−40℃になつた頃から成形
品にひび割れが目立ち始め、−45℃ではひび割れ
が多く、その成形品は製品として評価できない状
態のものであつた。 Next, when we stopped heating the drum and continued molding,
Cracks began to become noticeable in the molded product when the wall temperature of the molding cavity decreased to -40°C, and at -45°C there were many cracks, and the molded product could not be evaluated as a product.
図面は本発明実施装置の概略図である。
１……ホツパ、２……スクリユフイーダ、３…
…ロールプレス、３ａ……成形空所。
The drawing is a schematic diagram of an apparatus for implementing the present invention. 1...Hotsupa, 2...Skuriyuphida, 3...
... Roll press, 3a... Molding cavity.
Claims (1)
に穿設された成形空所に押込んで所望大のドライ
アイスを成形するに当り、前記成形空所内の温度
を−40℃以上に保ち、成形圧力約50〜500Kg／cm2
で成形することを特徴とするドライアイスの成形
方法。1. When pushing dry ice in the form of powder into a molding cavity bored into the curved surface of a roll press to form dry ice of the desired size, the temperature inside the molding cavity is maintained at -40°C or higher, and the molding pressure is approx. 50～500Kg/ cm2
A method of forming dry ice characterized by forming it with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56133551A JPS5836913A (en) | 1981-08-26 | 1981-08-26 | Molding method for dry ice |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56133551A JPS5836913A (en) | 1981-08-26 | 1981-08-26 | Molding method for dry ice |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5836913A JPS5836913A (en) | 1983-03-04 |
| JPS636482B2 true JPS636482B2 (en) | 1988-02-10 |
Family
ID=15107454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56133551A Granted JPS5836913A (en) | 1981-08-26 | 1981-08-26 | Molding method for dry ice |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5836913A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60145906A (en) * | 1983-12-29 | 1985-08-01 | Ishikawajima Harima Heavy Ind Co Ltd | Production of dry ice |
| JP2005272273A (en) * | 2004-03-26 | 2005-10-06 | Chugoku Electric Power Co Inc:The | Carbon dioxide separating and carrying-out apparatus, and carbon dioxide separating and carrying-out method |
| HUE032781T2 (en) * | 2013-05-07 | 2017-10-30 | Ics Ice Cleaning Systems S R O | Device for grinding and feeding of solid particles of dry ice for devices for mixing solid particles of dry ice with flow of gaseous medium |
| CN114133266B (en) * | 2021-11-22 | 2023-08-25 | 三峡大学 | Phosphogypsum cavity mold particle and preparation method of hollow building block |
-
1981
- 1981-08-26 JP JP56133551A patent/JPS5836913A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5836913A (en) | 1983-03-04 |
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