EP0492738B1 - A process for sorting bulbous and tuberous produce according to size, in particular suitable for potatoes - Google Patents

A process for sorting bulbous and tuberous produce according to size, in particular suitable for potatoes Download PDF

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Publication number
EP0492738B1
EP0492738B1 EP91203389A EP91203389A EP0492738B1 EP 0492738 B1 EP0492738 B1 EP 0492738B1 EP 91203389 A EP91203389 A EP 91203389A EP 91203389 A EP91203389 A EP 91203389A EP 0492738 B1 EP0492738 B1 EP 0492738B1
Authority
EP
European Patent Office
Prior art keywords
produce
class
sorting
classes
falling
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
EP91203389A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0492738A1 (en
Inventor
Jan Middel
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.)
Zijlstra and Bolhuis BV
Original Assignee
Zijlstra and Bolhuis BV
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 Zijlstra and Bolhuis BV filed Critical Zijlstra and Bolhuis BV
Publication of EP0492738A1 publication Critical patent/EP0492738A1/en
Application granted granted Critical
Publication of EP0492738B1 publication Critical patent/EP0492738B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/04—Sorting according to size

Definitions

  • This invention relates to a process for sorting bulbous and tuberous produce according to successive size classes, in particular suitable for sorting potatoes, wherein a sorting operation is carried out in which procedure is sorted according to sizes falling within at least two successive main classes.
  • potatoes are sorted into different size classes using internationally applied square size.
  • the square size of a potato can be defined as the length of the side of the small square opening through which the potato can pass.
  • the potatoes are sorted by means of the riddles into a number of classes, e.g., a first class of potatoes having a square size below 35 mm, a next class of potatoes having a square size ranging from 35 to 45 mm, etc.
  • a first class of potatoes having a square size below 35 mm e.g., a next class of potatoes having a square size ranging from 35 to 45 mm, etc.
  • potatoes are sorted into three size classes of, e.g., 20-30 mm, 30-50 mm and 50-70 mm
  • a relatively large number of produce having a square size ranging from 26 to 30 mm will generally be present in the class of 30-50 mm.
  • a process of the above type is characterized according to the invention in that in a transitional range between the at least two successive main classes at least one intermediate class is defined; that a first sorting operation is carried out, in which produce is sorted according to sizes falling within the remaining range of the at least two main classes and the at least one intermediate class; that the produce selected as falling within the remaining range of the main classes are passed to collections of produce belonging to those main classes; that the produce falling within the at least one intermediate class (is subjected to a second sorting operation, the produce falling into an intermediate class being separated into a first group belonging to the one main class pertaining to the relevant intermediate class and a second group belonging to the other main class pertaining to the relevant intermediate class; and that the two groups are added to the collections belonging to the main classes.
  • the French patent application 941031 describes a process wherein potatoes are firstly sorted in at least two successive subclasses.and wherein the potatoes of at least one subclass are sorted into two successive main classes falling within the at least one subclass.
  • the Figure schematically shows, by way of example, three size classes, according to which bulbous and tuberous produce such as potatoes, but also, e.g., onions wit the stems cut off, apples etc. can be sorted.
  • the size classes I, II and III correspond to, e.g., sizes determined according to the square size principle of respectively 20 through 29 mm, 30 through 49 mm and 50 through 69 mm.
  • the sizes of the major part of the produce classified during the sorting process into a wrong class are just below the sizes belonging to the next class of larger produce.
  • intermediate classes are introduced for produce having sizes that are near the boundary with the next class.
  • the intermediate class may be completely within one of the original classes, but may also overlap the boundary between two original classes.
  • two intermediate classes IV and V are defined for produce having sizes of from, e.g., 26 and 34 mm and 46 and 54 mm, respectively.
  • channel sorting method could be used as described in applicants' simultaneously filed Dutch patent application, according to which method produce like potatoes can be sorted based on the square size by measuring the height of the potato located in a V-shaped channel.
  • the produce present in the intermediate class is accurately sorted into two groups, the separation between the two groups being formed by the boundary between the orginal classes.
  • the sorting operation indicated at 4 separates the produce into produce below 30 mm and produce above 29 mm, respectively.
  • the first group is passed to the collection 20/29 and the second to the collection 30/49, as schematically indicated by arrows 6, 7.
  • the produce is separated at 5 into a first group below 50 mm and a second group above 49 mm, as indicated by arrows 8, 9.

Landscapes

  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Preparation Of Fruits And Vegetables (AREA)
  • Sorting Of Articles (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Seasonings (AREA)
EP91203389A 1990-12-21 1991-12-20 A process for sorting bulbous and tuberous produce according to size, in particular suitable for potatoes Expired - Lifetime EP0492738B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9002852A NL9002852A (nl) 1990-12-21 1990-12-21 Werkwijze voor het op grootte sorteren van bol- en knolvruchten, in het bijzonder geschikt voor aardappels.
NL9002852 1990-12-21

Publications (2)

Publication Number Publication Date
EP0492738A1 EP0492738A1 (en) 1992-07-01
EP0492738B1 true EP0492738B1 (en) 1995-08-30

Family

ID=19858199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91203389A Expired - Lifetime EP0492738B1 (en) 1990-12-21 1991-12-20 A process for sorting bulbous and tuberous produce according to size, in particular suitable for potatoes

Country Status (7)

Country Link
EP (1) EP0492738B1 (da)
AT (1) ATE127044T1 (da)
DE (1) DE69112590T2 (da)
DK (1) DK0492738T3 (da)
ES (1) ES2079557T3 (da)
GR (1) GR3017273T3 (da)
NL (1) NL9002852A (da)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2020014B1 (en) * 2017-12-04 2019-06-11 Lamb Weston/Meijer V O F Potato length measurement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR941031A (da) * 1949-01-04
US3438491A (en) * 1966-12-05 1969-04-15 Reserve Mining Co Conveying and classifying apparatus
US4225422A (en) * 1979-09-17 1980-09-30 Petro-Canada Exploration Inc. Beneficiation of heavy minerals from bituminous sands residues by dry screening
US4763794A (en) * 1986-07-30 1988-08-16 Billington Welding And Mfg. Produce sorting apparatus

Also Published As

Publication number Publication date
GR3017273T3 (en) 1995-11-30
ATE127044T1 (de) 1995-09-15
ES2079557T3 (es) 1996-01-16
DE69112590D1 (de) 1995-10-05
DE69112590T2 (de) 1996-02-08
EP0492738A1 (en) 1992-07-01
DK0492738T3 (da) 1996-01-15
NL9002852A (nl) 1992-07-16

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