JP3579804B2 - Screw for screw extrusion granulator - Google Patents
Screw for screw extrusion granulator Download PDFInfo
- Publication number
- JP3579804B2 JP3579804B2 JP19792095A JP19792095A JP3579804B2 JP 3579804 B2 JP3579804 B2 JP 3579804B2 JP 19792095 A JP19792095 A JP 19792095A JP 19792095 A JP19792095 A JP 19792095A JP 3579804 B2 JP3579804 B2 JP 3579804B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- stainless steel
- extrusion granulator
- fluororesin
- present
- 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 - Lifetime
Links
- 238000001125 extrusion Methods 0.000 title description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 17
- 239000010935 stainless steel Substances 0.000 claims description 17
- 239000002994 raw material Substances 0.000 description 13
- 239000000843 powder Substances 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000005469 granulation Methods 0.000 description 5
- 230000003179 granulation Effects 0.000 description 5
- 230000003405 preventing effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
Images
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Glanulating (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、スクリュー式押し出し造粒機のスクリューに関するものである。
【０００２】
【従来の技術】
スクリュー式押し出し造粒機は、図２に示す通りの構成で、ホッパー１より可塑性を持つ湿潤状態の原料を供給し、モーター２の駆動により減速機３を介してスクリュー４を回転させて図面左から右へ原料を送る。このスクリュー４の回転により送られた原料はダイ５の孔５ａを通して押し出され造粒される。
【０００３】
【発明が解決しようとする課題】
このようなスクリュー式押し出し造粒機は、湿潤粉体を原料とする関係上、粉体を圧縮するために用いられるスクリューに粉体が付着することがある。このようにスクリューに湿潤粉体が付着すると、投入された原料が押し出し部（ダイ５）まで輸送されず造粒することが出来なくなる。特に湿潤粉糖は付着しやすく造粒が困難になることが多い。
【０００４】
本発明は、湿潤粉体原料特に粉糖のような付着しやすい原料粉体を用いても原料の粉体の付着のないしたがって押し出し造粒機に用いた場合造粒が困難になることのない押し出し式造粒用のスクリューを提供するものである。
【０００５】
【課題を解決するための手段】
本発明の押し出し造粒起用スクリューは、ステンレスよりなりその山の部分を除きフッ素樹脂をコーティングしたもので、スクリューの山の部分はステンレス製母材があらわれその他の面はフッ素樹脂にて覆われるようにしたもので、湿潤粉体の付着を防止するようにしたもので、特に付着し易い湿潤粉糖の造粒の場合でも付着防止効果を有する。
【０００６】
本発明は、ステンレス製のスクリューを母材としこれに各種加工を行なったスクリューを用いて多くの実験をくり返した結果生れたものである。
【０００７】
まずステンレス製のスクリューを母材としてその表面にフッ素樹脂をコーティングしたものを造粒機に取り付け実験した結果、十分な付着防止効果が得られたがスクリューの先端（山）にコーティングしたフッ素樹脂が、押し出し機のケーシング内面に付着して硬化した砂糖と接触しこれによりフッ素樹脂が削り取られる欠点がある。
【０００８】
次に同様にステンレス製のスクリューを母材としその表面に耐摩耗性を強めた組成のフッ素樹脂をコーティングしたものを用いて実験を行なった。しかし、この耐摩耗性のフッ素樹脂は、付着防止効果が余り得られず、長時間の連続運転を行なうと原料が付着して使用出来なくなる。
【０００９】
更にステンレスシャフトに高分子ポリエチレン樹脂をスクリュー成型したスクリューにより実験した結果も、スクリュー先端（山）が削り取られ好ましくない。
【００１０】
以上の実験結果をもとに、前述のように本発明者は、ステンレス製のスクリューの表面にフッ素樹脂をコーティングすると共にスクリューの先端（山の部分）のみフッ素樹脂を除去し、ケーシング内面に付着した砂糖が硬化しても、この硬化した砂糖と接触する部分がステンレスであり、樹脂が削り取られることのないようにしたものである。
【００１１】
又本発明のスクリューにもちいられるコーティング樹脂の厚さは数ミリであり、しかもスクリューの先端のケーシングに近接する範囲（一般には数ミリ程度）ステンレスの地肌を残したものである。
【００１２】
本発明のスクリューは、母材としてステンレスを用いて製作したスクリューの表面にフッ素樹脂をコーティングして厚さ２〜３ｍｍ程度のフッ素樹脂層を形成した後に、前記の山の部分のみ樹脂を削り取ることにより製作された。
【００１３】
このようにして作られた本発明のスクリューを備えたスクリュー式押し出し造粒機を用いて湿潤粉糖を造粒した結果、粉糖の付着は全くなかった。又粉糖がケーシング内壁に付着硬化しても硬化した砂糖と接するのは樹脂が存在せずステンレスのあらわれている山の部分であるため、樹脂に傷がつくことはなく、耐久性等でも問題がない。
【００１４】
【実施例】
次に図面をもとに本発明のスクリューの実施例を述べる。図１は本発明のスクリューを示す図で、スクリューの母材部分１０はステンレス製で一般の押し出し造粒機用スクリューと同様の形状である。１１は厚さ２〜３ｍｍのフッ素樹脂の層でステンレス製スクリュー１０の表面のうち山の部分１０ａ（幅２ｍｍ）を除いてすべてに設けられている。
【００１５】
この実施例のスクリューを用いたスクリュー式押し出し造粒機により湿潤された粉体をホッパーより供給しスクリューにて送る際、表面がフッ素樹脂にて覆われているために原料が付着するおそれがなく、そのために良好な押し出しが可能である。又一般にステンレス製であるケーシング１２の表面には原料が付着しやすく付着した原料が硬化しても、このケーシング１２に近接しているスクリューの先端（山の部分）１０ａには樹脂が存在せずステンレスの地肌があらわれているため樹脂層を傷つけることなく又樹脂層が剥離することがない。特に実験の結果山の部分１０ａの一定幅が連続して樹脂が存在しないがフッ素樹脂の場合剥離を起こすことがない。
【００１６】
上記実施例のスクリューを備えた押し出し造粒装置において、原料として粉糖を使用して実験した結果は次の通りである。
【００１７】
造粒期間（日数） 約１０日
総運転時間 約５０時間
最長の連続運転時間 １７時間１０分
最短の連続運転時間 ３時間３０分
上記の通り合計５０時間運転を行なったが、全く異常がなかった。
【００１８】
又比較のためにステンレス製のスクリューを備えた押し出し造粒装置により同じ原料を用いての造粒を行なったところ２０分〜３０分の連続運転が限度であった。
【００１９】
【発明の効果】
本発明のスクリューを用いた押し出し造粒機は、湿潤原料が付着することなく又長期間の使用が可能である。
【図面の簡単な説明】
【図１】本発明のスクリューを示す図
【図２】従来のスクリュー式押し出し造粒機の構成を示す図
【符号の説明】
１ ホッパー
２ モーター
３ 減速機
４ スクリュー
５ ダイ
５ａ ダイの孔
１０ スクリューの母材部分
１１ フッ素樹脂の層
１１ａ スクリューの先端（山）の部分
１２ ケーシング[0001]
[Industrial applications]
The present invention relates to a screw for a screw-type extrusion granulator.
[0002]
[Prior art]
The screw-type extrusion granulator is configured as shown in FIG. 2, supplies plasticized wet raw material from a hopper 1, rotates a screw 4 via a speed reducer 3 by driving a motor 2, and To the right. The raw material sent by the rotation of the screw 4 is extruded through the
[0003]
[Problems to be solved by the invention]
In such a screw-type extrusion granulator, powder may adhere to a screw used for compressing the powder because the wet powder is used as a raw material. When the wet powder adheres to the screw in this way, the input raw material is not transported to the extruding section (die 5) and cannot be granulated. In particular, wet powdered sugar easily adheres and granulation often becomes difficult.
[0004]
The present invention has no adhesion of the raw material powder even when a wet powder raw material, particularly a raw powder easily adhered such as powdered sugar, is used, so that granulation does not become difficult when used in an extrusion granulator. An object of the present invention is to provide an extrusion-type granulation screw.
[0005]
[Means for Solving the Problems]
The extrusion granulation screw of the present invention is made of stainless steel and coated with a fluororesin except for the ridge portion, so that the ridge portion of the screw appears as a stainless steel base material and the other surface is covered with the fluororesin. In this case, the wet powder is prevented from adhering, and has an adhesion preventing effect even in the case of wet powdered sugar, which is particularly easily adhered.
[0006]
The present invention was produced as a result of repeating a number of experiments using a screw made of stainless steel as a base material and subjected to various processes.
[0007]
First, a stainless steel screw was used as a base material, and the surface coated with fluororesin was attached to a granulator. As a result of the experiment, a sufficient adhesion preventing effect was obtained. However, there is a disadvantage that the fluororesin is scraped off due to contact with the hardened sugar which has adhered to the inner surface of the casing of the extruder.
[0008]
Next, an experiment was similarly performed using a stainless steel screw as a base material and a surface coated with a fluororesin having a composition having enhanced wear resistance. However, this abrasion-resistant fluororesin does not provide a sufficient effect of preventing adhesion, and if a long-time continuous operation is performed, the raw material adheres and cannot be used.
[0009]
Further, the result of an experiment using a screw in which a high-molecular polyethylene resin is screw-molded on a stainless steel shaft is also not preferable because the screw tip (peak) is scraped off.
[0010]
Based on the above experimental results, as described above, the present inventor coated the surface of the stainless steel screw with the fluororesin, removed the fluororesin only at the tip (the mountain portion) of the screw, and attached it to the inner surface of the casing. Even if the hardened sugar hardens, the portion in contact with the hardened sugar is made of stainless steel so that the resin is not scraped off.
[0011]
The thickness of the coating resin used for the screw of the present invention is several millimeters, and the surface of the stainless steel is left in a range close to the casing at the tip of the screw (generally about several millimeters).
[0012]
The screw of the present invention is formed by coating a surface of a screw made of stainless steel as a base material with a fluororesin to form a fluororesin layer having a thickness of about 2 to 3 mm, and then shaving off the resin only at the peaks. Produced by
[0013]
As a result of granulating wet powdered sugar using the screw-type extrusion granulator equipped with the screw of the present invention thus produced, no powdered sugar was attached. Even if powdered sugar adheres and hardens to the inner wall of the casing, the hardened sugar comes into contact with the hardened sugar in the mountainous area where the stainless steel is present without resin, so the resin is not damaged and there is no problem in durability etc. There is no.
[0014]
【Example】
Next, an embodiment of the screw of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a screw of the present invention. A
[0015]
When the powder wetted by the screw-type extrusion granulator using the screw of this embodiment is supplied from the hopper and sent by the screw, there is no possibility that the raw material adheres because the surface is covered with the fluororesin. Therefore, good extrusion is possible. Further, even if the raw material is easily adhered to the surface of the
[0016]
The results of an experiment using powdered sugar as a raw material in the extrusion granulator equipped with the screw of the above embodiment are as follows.
[0017]
Granulation period (number of days) Approximately 10 days Total operation time Approximately 50 hours Longest continuous operation time 17
[0018]
For comparison, the same raw material was granulated using an extrusion granulator equipped with a stainless steel screw, and continuous operation was limited to 20 to 30 minutes.
[0019]
【The invention's effect】
The extrusion granulator using the screw of the present invention can be used for a long period of time without adhesion of wet raw materials.
[Brief description of the drawings]
FIG. 1 is a view showing a screw of the present invention. FIG. 2 is a view showing a configuration of a conventional screw type extrusion granulator.
REFERENCE SIGNS LIST 1 hopper 2 motor 3 reducer 4 screw 5 die 5 a
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19792095A JP3579804B2 (en) | 1995-07-12 | 1995-07-12 | Screw for screw extrusion granulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19792095A JP3579804B2 (en) | 1995-07-12 | 1995-07-12 | Screw for screw extrusion granulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0924267A JPH0924267A (en) | 1997-01-28 |
| JP3579804B2 true JP3579804B2 (en) | 2004-10-20 |
Family
ID=16382482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19792095A Expired - Lifetime JP3579804B2 (en) | 1995-07-12 | 1995-07-12 | Screw for screw extrusion granulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3579804B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5722622B2 (en) * | 2010-12-15 | 2015-05-27 | 不二パウダル株式会社 | Continuous kneading granulator |
| PL3768416T3 (en) * | 2018-03-23 | 2023-03-06 | Thyssenkrupp Fertilizer Technology Gmbh | Fluid-bed granulator system with coating material to prevent dust buildup in the air systems of urea granulation plants |
| JP2022144622A (en) * | 2021-03-19 | 2022-10-03 | 株式会社リコー | POWDER CONVEYOR AND IMAGE FORMING APPARATUS |
-
1995
- 1995-07-12 JP JP19792095A patent/JP3579804B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0924267A (en) | 1997-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3579804B2 (en) | Screw for screw extrusion granulator | |
| US5370456A (en) | Continuous kneading apparatus provided with rotatable kneading members and fixed kneading members | |
| BR9708594A (en) | Method and apparatus for the manufacture of an extruded plastic product and plastic product | |
| CA2158203A1 (en) | Chewing Gum Manufacture Using Pin and Blade Extruders | |
| JP2002526281A (en) | Mixing element of screw extruder | |
| EP0769361A3 (en) | Process for producing thermoplastic elastomer compostion | |
| FR2628028B1 (en) | EXTRUDED POLYMERIC FILM COMPRISING ADHESIVE TAPES AND METHOD AND APPARATUS FOR THE PRODUCTION THEREOF | |
| US4309115A (en) | Method and apparatus for improved solids conveying in plasticating extruders | |
| JPH0586738B2 (en) | ||
| JP2002013592A (en) | Wheel balancer composition and wheel balancer | |
| JP3806223B2 (en) | Screw type extruder | |
| EP0999030A3 (en) | An apparatus and a method for the extrusion of mouldings from a cross-linkable polymer material | |
| JP3474328B2 (en) | Injection molding screw | |
| JP2001038726A (en) | Volume reduction granulation method and apparatus for waste plastic containing combustible waste | |
| JP2002355879A (en) | Screw for conical twin screw extruder and extrusion molding method using the same | |
| EP1512529A1 (en) | Resin-coated steel pipe excellent in mechanical strength such as sliding property | |
| Tzoganakis et al. | Response surface analysis of average residence times in a co-rotating twin screw extruder | |
| JPH08281648A (en) | Paint film removing device for coated resin product | |
| JP4463644B2 (en) | Foam extrusion molding equipment | |
| JP2580994Y2 (en) | Gear roll body of extrusion granulator | |
| JP5106550B2 (en) | Foam extrusion molding equipment | |
| JPH0542580A (en) | Extruding machine provided with auxiliary screw | |
| JPS6114923B2 (en) | ||
| JPH0655612A (en) | Screw for double-screw extruder | |
| KR20210130968A (en) | Manufacturing method of antibiotic film having improved distribution equality |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20040706 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040707 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070730 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080730 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090730 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100730 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100730 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110730 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120730 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120730 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130730 Year of fee payment: 9 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |