EP0592373B1 - Procédé de raffinage pour riz semi-cru - Google Patents

Procédé de raffinage pour riz semi-cru Download PDF

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Publication number
EP0592373B1
EP0592373B1 EP93830141A EP93830141A EP0592373B1 EP 0592373 B1 EP0592373 B1 EP 0592373B1 EP 93830141 A EP93830141 A EP 93830141A EP 93830141 A EP93830141 A EP 93830141A EP 0592373 B1 EP0592373 B1 EP 0592373B1
Authority
EP
European Patent Office
Prior art keywords
rice
grains
rubbing
semiraw
helix
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
Application number
EP93830141A
Other languages
German (de)
English (en)
Other versions
EP0592373A1 (fr
Inventor
Francesco Vignola
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.)
RISERIA MONFERRATO Srl
Original Assignee
RISERIA MONFERRATO Srl
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 RISERIA MONFERRATO Srl filed Critical RISERIA MONFERRATO Srl
Publication of EP0592373A1 publication Critical patent/EP0592373A1/fr
Application granted granted Critical
Publication of EP0592373B1 publication Critical patent/EP0592373B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B3/00—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming
    • B02B3/04—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming by means of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B3/00—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B3/00—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming
    • B02B3/06—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming by means of screws or worms

Definitions

  • the present invention relates to a refining process for semiraw rice.
  • Each of such machines is substantially formed of a metal member of inverted truncated conical form which is externally coated with a layer of abrasive material and rotates at high speed within a fixed casing of truncated conical form too.
  • the fixed casing is generally made of a metal sheet and exhibits a plurality of holes of small diameter, that is capable of enabling passage of the husks and not of the individual rice grains.
  • the already hulled rice is introduced into the machine from the upper part thereof so that, while passing through the gap of adjustable width formed by the facing surfaces of said two members, it undergoes polishing, due above all to rubbing of the grains against the abrasive surface of the rotating frustoconical member.
  • a vacuum system active externally of the fixed casing carries out sucking of husks and powder through the holes provided in the fixed casing. Therefore as soon as the outer cortical layers are detached from the grains due to the rubbing action, they are also immediately separated from said grains.
  • a refining action of the same typology can be achieved by inverted-taper polishing machines or horizontal-cylinder polishing machines having one or more sectors.
  • husks are rich in nutritive substances, flavours and good smells. By separating husks as soon as they are detached from the rice grain, said nutritive substances, flavours and good smells are completely lost.
  • the rice mass kept in continuous motion, produced a substantially uniform rubbing of the grains with respect to one another thereby giving rise to a consequent uniform processing of the grains, irrespective of their size, so as to avoid irregular surface removals and fractures.
  • husks were not separated from rice during the whole process, thereby transferring part of their flavour, good smell and nutritive properties to the grains.
  • the technical task underlying the present invention is to devise a process capable of substantially overcoming limits and drawbacks of the refining processes of known type.
  • the process of the invention consists in previously using a taper polishing machine 1.
  • this machine the first step A of the inventive process in which grains are surface-cut is carried out.
  • hulled rice to be refined is introduced into this machine and more particularly in the gap formed between a rotating member 2 coated with an abrasive material and a fixed casing 3 made of a metal sheet and disposed eternally of the rotating member 2.
  • the machine 1 is used over a single passage and said machine is such adjusted that it does not produce a strong rubbing on the rice grains which might cause the grain fracture.
  • the machine adjustment allows a non-violent rubbing to be produced which is only capable of forming surface cuts in the grains, thereby greatly increasing their abrasion capability and making their separation from the husks easier.
  • rice processed in the taper type polishing machine 1 is transferred to a spiral type polishing machine 4, that is a machine comprising a helix or screw 5 rotating within a vessel or pot 6 substantially of ovoidal or semispherical form.
  • the second step B involving removal of the cortical layer from the grains takes place. That is, the rice grains previously surface-cut in the taper type machine 1, and therefore provided with a rough surface, cyclically rub against one another as provided in conventional spiral machines such as the polishing machine 4, thereby producing an easy removal of husks and powders.
  • the abrasive action is gradual and homogeneously distributed on all grains, so that the product appears uniform, well polished, and does not include scratched or blunt grains, irrespective of the grain sizes.
  • the produced rice acquires a greater homogeneity even when subsequently submitted to cooking.
  • rice is submitted to a sieving step C using a sieve of a conventional type not shown in the drawings and intended for separating the residual husks from the refined rice.
  • the invention achieves important advantages.

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  • Cereal-Derived Products (AREA)
  • Adjustment And Processing Of Grains (AREA)

Claims (4)

  1. Procédé de raffinage pour riz semi-cru, comprenant les étapes suivantes:
    - effectuer des entailles ou incisions superficielles sur les grains de riz semi-cru par frottement contre une surface abrasive,
    - soumettre les grains pourvus des incisions superficielles à un frottement réciproque destine a enlever les couches corticales,
    caractérise en ce qu'il comporte une étape finale de:
    - séparer par tamisage lesdites couches corticales du riz.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit frottement des grains contre une surface abrasive est réalise par une première machine de blanchissage (1) comprenant un organe rotatif (2) revêtu d'une matière abrasive et une enveloppe fixe (3) disposée a l'extérieur dudit organe rotatif (2), ladite enveloppe fixe (3) et ledit organe rotatif (2) définissant entre eux un espace vide pour le passage du riz semi-cru, et en ce que ledit frottement réciproque des grains est effectué par une deuxième machine de blanchissage (4) du type comprenant au moins une hélice (5) à axe vertical et un récipient sensiblement ovoïdal (6) adapté a contenir le riz, ladite hélice (5) tournant à l'intérieur dudit récipient ovoïdal (6).
  3. Procédé selon la revendication 1, caractérisé en ce que ladite étape dans laquelle les grains pouvus d'incisions superficielles sont soumis à frottement réciproque est obtenue par au moins deux demi-étapes distinctes réalisées dans des machines respectives de blanchissage du type à hélice (4).
  4. Procédé selon la revendication 3, caractérisé en ce que dans la première demi-étape on utilise une hélice (5) ayant une rugosité de surface plus marquée que celle de l'hélice (5) employée dans la seconde demi-étape.
EP93830141A 1992-09-29 1993-04-02 Procédé de raffinage pour riz semi-cru Expired - Lifetime EP0592373B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI922253A IT1255701B (it) 1992-09-29 1992-09-29 Procedimento di raffinazione del riso semigreggio
ITMI922253 1992-09-29

Publications (2)

Publication Number Publication Date
EP0592373A1 EP0592373A1 (fr) 1994-04-13
EP0592373B1 true EP0592373B1 (fr) 1997-07-02

Family

ID=11364032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93830141A Expired - Lifetime EP0592373B1 (fr) 1992-09-29 1993-04-02 Procédé de raffinage pour riz semi-cru

Country Status (4)

Country Link
EP (1) EP0592373B1 (fr)
AT (1) ATE154897T1 (fr)
DE (1) DE69311871D1 (fr)
IT (1) IT1255701B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6896223B2 (ja) * 2017-04-13 2021-06-30 株式会社サタケ 酒造用精穀機
CN107486285B (zh) * 2017-08-29 2019-01-11 盐城大学科技园有限公司 一种新型薏米脱壳机
CN107670750A (zh) * 2017-09-29 2018-02-09 贵州神农米业有限公司 一种大米精加工系统
CN111185252B (zh) * 2020-01-16 2021-04-20 浙江恒天粮食股份有限公司 一种不同蛋白含量的小麦粉的制粉方法及碾麦装置
CN113058681B (zh) * 2021-04-16 2022-09-30 哈尔滨工程北米科技有限公司 一种留胚米加工方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE281711C (fr) *
DE265116C (fr) *
DE428289C (de) * 1923-09-11 1926-04-28 Federico Pagliani Schaelmaschine
US3485280A (en) * 1966-06-01 1969-12-23 Toshihiko Satake Combination of grinding and friction-type rice polishing machine

Also Published As

Publication number Publication date
IT1255701B (it) 1995-11-10
EP0592373A1 (fr) 1994-04-13
DE69311871D1 (de) 1997-08-07
ATE154897T1 (de) 1997-07-15
ITMI922253A1 (it) 1994-03-29

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