EP2848323A1 - Appareil de tamisage de feuilles de thé - Google Patents

Appareil de tamisage de feuilles de thé Download PDF

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Publication number
EP2848323A1
EP2848323A1 EP13184234.6A EP13184234A EP2848323A1 EP 2848323 A1 EP2848323 A1 EP 2848323A1 EP 13184234 A EP13184234 A EP 13184234A EP 2848323 A1 EP2848323 A1 EP 2848323A1
Authority
EP
European Patent Office
Prior art keywords
tea leaves
sieving
perforated plate
perforated
plate
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.)
Withdrawn
Application number
EP13184234.6A
Other languages
German (de)
English (en)
Inventor
Julien Favre
Florence Letroux
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.)
Nestec SA
Original Assignee
Nestec SA
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 Nestec SA filed Critical Nestec SA
Priority to EP13184234.6A priority Critical patent/EP2848323A1/fr
Publication of EP2848323A1 publication Critical patent/EP2848323A1/fr
Withdrawn legal-status Critical Current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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4636—Regulation of screen apertures
    • 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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/30—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro within their own plane in or approximately in or transverse to the direction of conveyance
    • 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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4663—Multi-layer screening surfaces
    • 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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning

Definitions

  • the present invention relates to devices for sieving leaves, in particular tea leaves.
  • beverage capsules usually comprise powders like roast and ground coffee, instant coffee, milk powder, soluble chocolate powder.
  • the manufacture and in particular the filling of such capsules is easy to industrialise since a dose of powder has simply to be introduced in an opened side of the capsule before closing said side/opening with a lid.
  • a solution to this problem can be to cut the tea leaves raw material so that tea leaves do not oversize a certain length that is less than the size of the capsule opening. Yet such a solution can affect the sensorial quality of the final tea beverage. For example high quality tea should not be cut. It is known that the handling of such leaves must remain gentle and non-intrusive e.g. throughout the packaging process to avoid breaking of the cell structure. This is needed because once the cell walls are physically broken, oxidation of the leaves quickens and the quality will be compromised. Moreover cutting influences the optimal extraction of tea leaves. Finally cutting action on the tea leaves raw material creates fines by cutting small leaves that have not to be cut leading to property issue in the manufacturing line and loss of raw material.
  • Another solution is to sieve the tea leaves raw material with a mesh presenting a size such that longest tea leaves are retained by the mesh. Yet for retaining tea leaves presenting a length of at least 15 mm is not efficient. Actually it has been observed that during their transport along the mesh tea leaves are never fully positioned in parallel to the mesh. Long leaves are often obliquely positioned and if one end of one long tea leaf enters in a hole of the mesh then the whole leaf slides in the hole and is not eliminated by the sieving operation. Then such a sieving is not efficient. Yet the presence of one long tea leaf in a tea leaves production batch is not acceptable for filling capsules because it creates a risk of blocking the capsule manufacturing line.
  • the object of the present invention is to propose a solution for gently sieving tea leaves in order to remove the longest tea leaves.
  • Another object of the present invention is to propose a solution for gently sieving tea leaves in order to remove the longest tea leaves with the highest efficiency.
  • Another object of the present invention is to propose a solution for gently sieving tea leaves in order to remove the longest tea leaves with such an efficiency that tea leaves can then used for filling tea leaves capsules at an industrial scale.
  • the invention concerns a tea leaves sieving apparatus comprising a sieving member for treating tea leaves conveyed according to one direction (D) on the sieving member said sieving member comprising two perforated plates positioned one on the other and so that :
  • meshes and grids are nettings made of fine metallic wires. They do not enable the implementation of the invention, in particular the formation of steps by superposing the holes of two meshes or grids.
  • both perforated plates are closely positioned one on the other so that there is no space in between in which a tea leaf could enter. Meanwhile the perforated plates should not be stuck one to the other so that at least one of the perforated can be made movable relative to the other without clipping each other.
  • all the holes of a same perforated plate present the same shape and size.
  • plates with holes presenting increasing or decreasing sizes according to the conveying direction can be implemented.
  • the perforated plates of the sieving member comprise circular holes.
  • the holes are positioned in staggered rows in the perforated plates. Staggered rows avoid the possibility for a tea leave to not be sieved.
  • each hole of the upper perforated plate is positioned above a hole of the lower perforated plate.
  • the lower perforated plate is out of line with the upper perforated plate so that the superposing of said two perforated plates creates a step in each space defined by the superposed holes.
  • the step is positioned in said space on the downwards side according to the conveying direction (D).
  • the size of the holes in the lower perforated plate and the spacing between said holes can present any size provided that when it is placed under the top perforated plate an ascending step is present.
  • the two perforated plates of the sieving member are identical. They present the same size of holes and the same spacing between the holes.
  • the size of the holes in the upper perforated plate and the length of the ascending step are defined according to the properties of the tea leaves raw material (e.g. mean size, nature of the leaves) to be treated and the length of the tea leaves to be eliminated. For example starting from a raw material tea comprising tea leaves with length up to 60 mm and searching to eliminate tea leaves presenting a length greater than 15 mm then the following conditions can be applied :
  • the sieving member comprises a collecting plate under the two perforated plates.
  • the collecting plate aims at gathering the sieved tea leaves and conveying them to the end of the sieving member.
  • the collecting plate is generally positioned at a distance (d) from the lower perforated plate.
  • the apparatus of the present invention comprises means for adjusting said distance (d) on the tea leaves raw material properties and/or the length of the tea leaves that have to be eliminated from the raw material. For example for the tea leaves exemplified hereabove a distance d of at most 6 mm can be fixed.
  • the apparatus comprises a translation device for translating at least one of the two perforated plates of the sieving member according to a back and forth translation movement relatively to the other perforated plate and along the conveying direction (D).
  • a translation device for translating at least one of the two perforated plates of the sieving member according to a back and forth translation movement relatively to the other perforated plate and along the conveying direction (D).
  • D conveying direction
  • the translation device translates the lowest perforated plate.
  • the translation movement is configured so that the translated perforated plate totally closes the holes of the other perforated plate during its translation movement. Due to this closure of the holes the long tea leaves blocked in the holes can be cut to a smallest size.
  • the length of the translation movement can be determined according to the size of the holes and the space between the holes in the perforated plates in particular for getting a full closure of the holes during the translation.
  • the translation movement can be implemented periodically.
  • the frequency can depend on the properties of the tea leaves raw material.
  • the translation movement can happen between every 10 seconds and every 30 seconds.
  • the tea leaves sieving apparatus comprises a vibrator for vibrating the perforated plates so that tea leaves are conveyed according to the conveying direction (D).
  • the vibrator also vibrates the collecting plate. Then the vibrator enables simultaneously :
  • the vibrator for vibrating the perforated plates is a linear vibrator.
  • the apparatus of the present invention can also comprise a conveyor upstream to the sieving member in order to introduce tea leaves on the sieving member according to the conveying direction (D).
  • the upstream conveyor aims also at spreading tea leaves on the upper perforated plate of the sieving member according to a homogeneous height.
  • the upstream conveyor is a linear vibrator in general. For example a height of at most 0,5 cm can be preferred so that leaves can be homogeneously sieved with perforated plates presenting circular of about 6 mm diameter.
  • the conditions are chosen generally so that the height is homogeneous and the flow of tea leaves on the sieving member is regular.
  • the sieving apparatus can comprise a plurality of sieving members positioned next to the other perpendicularly to the conveying direction (D).
  • the invention concerns a process for sieving a raw material of tea leaves with an apparatus such as described hereabove comprising the steps of :
  • At least one of the perforated plates of the sieving member is translated according to a back and forth translation movement relatively to the other sieve and along the conveying direction (D).
  • the frequency of the translation movement depends on the nature of the tea leaves to be sieved.
  • the lowest sieve is translated.
  • the translation movement closes the hole of the upper perforated plate totally.
  • the invention concerns a manufacturing line for producing beverage capsules said capsules comprising tea leaves wherein the manufacturing line comprises an apparatus such as described hereabove for sieving the tea leaves material before dosing and filling the capsules with sieved tea leaves.
  • the invention concerns a process for manufacturing beverage capsules said capsules comprising tea leaves wherein said process comprises the steps of :
  • tea leaves refer to loose leaf tea generally. Although the invention was described in relation to tea leaves sieving it could be applied to the sieving of any material comprising comparable long leaves like herbals.
  • tea leaves are sieved.
  • the longest tea leaves stay on the upper part of the sieving members. They are collected through a hopper 26 at the outlet of the sieving apparatus. The other leaves are collected on a collecting plate 24 on the lower part of the sieving members.
  • Figure 2b is a side view of the sieving member of a tea leaves sieving apparatus such as described in Figure 2a . It illustrates how the vibration conveyor 3 is positioned a little bit above the sieving member 2 in order to separate the vibration movements of the conveyor 3 and the sieving member 2.
  • the tea leaves fall from the vibration conveyor 3 onto the upper plate of the sieving member 2 where they are sieved.
  • the longest tea leaves stay on the upper plate and are conveyed to the end of the sieving member 2 according to direction D where an inclined plate 25 direct then to a collecting pot 27.
  • the other tea leaves are collected on the collecting plate of the sieving member and directed through another inclined plate 28 and a tube 29 to a sack 30.
  • the sack 30 and the collecting pot 27 can be supported by a trolley so as to move the sieved tea leaves to the manufacturing line easily.
  • Figures 3a to 3d are schematic views of the perforated plates of one sieving member during the sieving process.
  • the sieving member comprises two perforated plates 21, 22, each plate presenting holes 21a, 22a.
  • the lower perforated plate 21 is out of line with the upper perforated plate 22 so that the superposing of said two perforated plates creates for each superposed holes 21a, 22a a step 23, said step ascending according to the conveying direction D.
  • the both plates present holes of same size and presenting the same space between each hole (in particular according to direction D), yet as illustrated in Figure 5 , the both plates can present holes of different sizes and spaces between holes of one same plate of different sizes with the condition that their superposition creates a step such as described hereabove.
  • tea leaves 5 are moved according to direction D above the perforated plates.
  • the shorter tea leaves 52 presenting a size inferior to the holes obtained by the superposition of the plates fall though said holes and are collected on the collecting plate 24.
  • the longest tea leaves 51 presenting a size superior to the holes obtained by the superposition of the plates usually stay on the upper plate 22 since their dimension does not enable them to fall in the holes.
  • an extremity 51a of such a long tea leaf can engage in a hole 22a of the upper plate.
  • a mesh of the prior art such a long tea leaf completely falls in the hole of the perforated plate and is collected and mixed with the short tea leaves 52.
  • the lower perforated plate creates a step 23 and the extremity 51a of long tea leaf entering in a hole 22a of the upper perforated plate remains blocked in the corner 23a of the step. Due to the continuous movement of tea leaves according to direction D, the new coming tea leaves 5 push the blocked long tea leaf 51 and force it to go out of the step.
  • the length L of the hole 22a in the upper perforated plate, the length I of the step 23 and the distance d between the collecting plate 24 and perforated plates 21 can be adjusted according to the length of tea leaves 51 that must be sieved from the tea leaves raw material.
  • an apparatus can comprise :
  • one sample tea leaves could be treated so that 100 % tea leaves presenting a length greater than 20 mm were eliminated from the raw material and 85 % of the tea leaves presenting a length greater between 15 mm were eliminated. Then the sieved raw material could be used safely in a manufacturing line for producing tea beverage capsules wherein the capsules present an opening greater than 20 mm.
  • FIG 6 is a magnified view of the sieving member 2 of Figure 2b .
  • the sieving member 2 has an assembly of plates 200 comprising the two perforated plates and the collecting plate.
  • the sieving member 2 comprises a translation device 7 that is configured for imparting a translation movement to the lowest perforated plate of the assembly 200.
  • translation device 7 is connected to said lowest perforated plate and imparts a back and forth translation movement to said plate according to directions D b and D f .
  • the assembly of plates 200 and the translation device 7 are supported by a vibrator 8.
  • the vibrator 8 vibrates in order to impart a conveying movement according to direction D simultaneously:
  • the vibrator is a conveying vibrator according to the state of the art.
  • the speed of displacement of tea leaves depends on the vibration frequency and amplitude. Said features can vary depending on the nature of the tea leaves to be sorted.
  • Figure 7 is a partially exploded view of the assembly of plates 200 and the translation and vibrator devices of the sieving member of Figure 6 .
  • the view is made from the end of the sieving member.
  • the assembly 200 comprises the collecting plate 24 on which is freely positioned the lowest perforated plate 21 so that said plate 21 can slide on the collector plate 24.
  • the assembly also comprises the upper perforated plate 22 which is fixed an attached to the collecting plate 24 through corresponding holes 221 and screws 241.
  • the collecting plate is attached to the translation device 7 but is not made movable as will be further explained in relationship with Figure 11 .
  • Figures 8a and 8b are views of the upper perforated plate 22.
  • the plate comprises circular holes 22a in staggered rows.
  • Figures 9a and 9b are views of the lowest perforated plate 21.
  • the plate comprises circular holes 21a in staggered rows.
  • the lowest perforated plates 21 is identical to the upper perforated plate 22 of Figures 8a, 8b in terms of size of the holes and position of the holes on the plate surface. Then when the both plates are superposed each hole 21a in the lowest plate faces a hole 22a in the upper plate.
  • the plates 21, 22 are positioned so that the holes are slightly out of line and so that for each superposed holes 21a, 22a an ascending step 23 according to the conveying direction D is created as illustrated in Figure 3a .
  • the lower plate 22 presents an excrescence with a stud 211 perpendicular to main plane of the plate and configured for cooperating with the translation device.
  • Figure 10 is a view of the collecting plate 24 of the sieving member. It presents bars 242 on its lateral sides on which the perforated plate 21 rests. The bars presents a height d, consequently when the lowest perforated plate 21 is positioned on the collecting plate 24 a distance d separates the holes 21a from the collecting plate 24.
  • Figure 11 is a magnified view of Figures 2b and 6 showing the cooperation between the translation device 7 and the lowest perforated plate 21 of the sieving member of Figure 6 .
  • the lowest perforated plate 21 is positioned between the upper perforated plate 22 and the collecting plate 24 so that its excrescence with the stud 211 bypasses the end of the other plates 22, 24.
  • the stud is connected to an arm 71 of the translation device that is submitted to back and forth translation according to directions D b and D f . Consequently the movement described in Figures 3d and 4 can be implemented.
  • the translation device 7 comprises a jack 72 on which the arm 71 is raised. Any other translation device known from the state of the art can be implemented.
  • the illustrated embodiment describes a sieving member in which the lower perforated plate is translated
  • the invention also covers embodiments wherein the upper perforated plate is translated compared to the lower plate.
  • the apparatus of the present invention presents the advantage of guaranteeing the efficient sieving of tea leaves presenting a length such that it could block a capsule manufacturing line. It provides a higher rate for sorting tea leaves compared to usual technologies.
  • the apparatus present also the advantage of gently treating the tea leaves and limiting the cutting of tea leaves which would affect their sensory profile in the cup.

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  • Tea And Coffee (AREA)
EP13184234.6A 2013-09-13 2013-09-13 Appareil de tamisage de feuilles de thé Withdrawn EP2848323A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13184234.6A EP2848323A1 (fr) 2013-09-13 2013-09-13 Appareil de tamisage de feuilles de thé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13184234.6A EP2848323A1 (fr) 2013-09-13 2013-09-13 Appareil de tamisage de feuilles de thé

Publications (1)

Publication Number Publication Date
EP2848323A1 true EP2848323A1 (fr) 2015-03-18

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EP13184234.6A Withdrawn EP2848323A1 (fr) 2013-09-13 2013-09-13 Appareil de tamisage de feuilles de thé

Country Status (1)

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EP (1) EP2848323A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106179971A (zh) * 2016-08-31 2016-12-07 陈玛炎 梗末分离效果好的茶叶挑梗机
CN106269527A (zh) * 2016-08-31 2017-01-04 陈玛炎 茶叶、茶末、茶梗分别独立收集的挑梗机
CN112264294A (zh) * 2020-10-26 2021-01-26 贵州晴隆五月茶业有限公司 一种高效白茶加工用拣梗机
CN113198730A (zh) * 2021-04-20 2021-08-03 浙江力征建设有限公司 一种抗冲击、耐压型物料处理装置及其处理方法
CN113231295A (zh) * 2021-03-17 2021-08-10 江苏振强机械科技股份有限公司 一种矿山机械用易通堵式振动筛筛网
CN114226247A (zh) * 2021-12-16 2022-03-25 杭州艺福堂茶业有限公司 一种茶叶的除杂及分选设备
CN114711302A (zh) * 2022-03-02 2022-07-08 湖南河西走廊茶业有限公司 一种茶叶加工设备
CN115121368A (zh) * 2022-08-31 2022-09-30 泉州海关综合技术服务中心 一种茶叶检测用散装物料分离装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB756971A (en) * 1954-01-18 1956-09-12 Ici Ltd Improvements in and relating to the screening of granular or particulate materials
FR1140961A (fr) * 1956-01-04 1957-08-22 Surface de criblage à dimensions de passage réglables
GB863433A (en) * 1958-05-08 1961-03-22 William Derrick Wadsworth Smit Improvements in or relating to tea sifting apparatus
FR1405330A (fr) * 1964-05-26 1965-07-09 Howes Co S Machine à nettoyer les matières granulaires
DE20211860U1 (de) * 2002-03-28 2003-07-31 Huning Umwelttechnik GmbH & Co.KG, 49326 Melle Siebvorrichtung
EP1767283A2 (fr) * 2005-09-26 2007-03-28 General Kinematics Corporation Système séparateur et procédé de séparation de matières
EP2484605A1 (fr) * 2011-02-03 2012-08-08 Samar Technologies Ltd. Capsule d'infusion pré-remplie, procédé de fabrication, dispositif associé et chambre d'infusion adaptée

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB756971A (en) * 1954-01-18 1956-09-12 Ici Ltd Improvements in and relating to the screening of granular or particulate materials
FR1140961A (fr) * 1956-01-04 1957-08-22 Surface de criblage à dimensions de passage réglables
GB863433A (en) * 1958-05-08 1961-03-22 William Derrick Wadsworth Smit Improvements in or relating to tea sifting apparatus
FR1405330A (fr) * 1964-05-26 1965-07-09 Howes Co S Machine à nettoyer les matières granulaires
DE20211860U1 (de) * 2002-03-28 2003-07-31 Huning Umwelttechnik GmbH & Co.KG, 49326 Melle Siebvorrichtung
EP1767283A2 (fr) * 2005-09-26 2007-03-28 General Kinematics Corporation Système séparateur et procédé de séparation de matières
EP2484605A1 (fr) * 2011-02-03 2012-08-08 Samar Technologies Ltd. Capsule d'infusion pré-remplie, procédé de fabrication, dispositif associé et chambre d'infusion adaptée

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106179971A (zh) * 2016-08-31 2016-12-07 陈玛炎 梗末分离效果好的茶叶挑梗机
CN106269527A (zh) * 2016-08-31 2017-01-04 陈玛炎 茶叶、茶末、茶梗分别独立收集的挑梗机
CN112264294A (zh) * 2020-10-26 2021-01-26 贵州晴隆五月茶业有限公司 一种高效白茶加工用拣梗机
CN113231295A (zh) * 2021-03-17 2021-08-10 江苏振强机械科技股份有限公司 一种矿山机械用易通堵式振动筛筛网
CN113198730A (zh) * 2021-04-20 2021-08-03 浙江力征建设有限公司 一种抗冲击、耐压型物料处理装置及其处理方法
CN114226247A (zh) * 2021-12-16 2022-03-25 杭州艺福堂茶业有限公司 一种茶叶的除杂及分选设备
CN114711302A (zh) * 2022-03-02 2022-07-08 湖南河西走廊茶业有限公司 一种茶叶加工设备
CN114711302B (zh) * 2022-03-02 2023-12-05 湖南河西走廊茶业有限公司 一种茶叶加工设备
CN115121368A (zh) * 2022-08-31 2022-09-30 泉州海关综合技术服务中心 一种茶叶检测用散装物料分离装置
CN115121368B (zh) * 2022-08-31 2022-11-04 泉州海关综合技术服务中心 一种茶叶检测用散装物料分离装置

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