EP3649263B1 - Method for adjusting the formula parameters of a drumming cycle of leathers - Google Patents

Method for adjusting the formula parameters of a drumming cycle of leathers Download PDF

Info

Publication number
EP3649263B1
EP3649263B1 EP18749548.6A EP18749548A EP3649263B1 EP 3649263 B1 EP3649263 B1 EP 3649263B1 EP 18749548 A EP18749548 A EP 18749548A EP 3649263 B1 EP3649263 B1 EP 3649263B1
Authority
EP
European Patent Office
Prior art keywords
cylindrical barrel
temperature
leathers
drumming
drumming cycle
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.)
Active
Application number
EP18749548.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3649263A1 (en
Inventor
Antonio Galiotto
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.)
Erretre SpA
Original Assignee
Erretre SpA
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Filing date
Publication date
Application filed by Erretre SpA filed Critical Erretre SpA
Publication of EP3649263A1 publication Critical patent/EP3649263A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B3/00—Milling leather
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/40—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/40—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills
    • C14B1/42—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills by means of a rotatable drum with radial blades

Definitions

  • the present invention relates to a method for adjusting the formula parameters of a drumming cycle of tannery leathers, or similar special laminar surfaces.
  • tanning refers, in the tanning industry, to the treatment of leathers in a machine, known as drum, both for the purpose of preparing them for tanning and for tanning, dyeing or greasing them.
  • the aforesaid formula parameters of a drumming cycle include:
  • drumming is a mechanical process that is carried out on any type of special fabric - generally, animal leathers - to give the product the appearance of aging or wrinkling, to make it softer and to eliminate possible folds present and then to prepare it for the subsequent processing stages.
  • the material is, indeed, subjected to mechanical action due to its rolling inside the cylindrical (often punched) barrel or basket which constitutes the main part of the machine (or drum) and which works by rotating around a generally horizontal transversal axis.
  • the product is cooled by means of circulation of cold air inside the cylindrical barrel which constitutes the main component of the drum.
  • the drumming cycle to which the leathers are subjected inside the cylindrical barrel of a tannery rotating drum is made according to a given "formula" which is essentially composed of prefixed temperature and relative humidity conditions, rotation speed of the cylindrical barrel imparted by suitable motorization means operatively connected with it, type and quantity of leathers treated inside the drum and time duration of the drumming cycle.
  • Such a “formula” thus allows to get, in theory, the desired and expected level of softness for dry leathers processed in a drumming cycle.
  • time duration (or treatment time) of a drumming cycle is left to the operator who preliminarily sets its value, relying on the processing history for that given type of leather from time to time to be treated and/or on his own professional experience.
  • the operator checks more or less frequently the softness status of the leathers being processed - based on his own experience and operating sensitivity, therefore evidently, empirically and arbitrarily and not in so rational and scientific way -, and especially near the expiry of the scheduled treatment time (which may vary from a few minutes to several hours, depending on the type of leathers processed and the expected softness effect), at the end of which the desired quality should be achieved, in terms of softness, of the leathers themselves.
  • the operator decides to continue the drumming cycle according to a time set always on the basis of his experience.
  • the operator also sets the temperature at which the drumming cycle begins (indicated in the following with Ti, for simplicity and exhibition convenience), as well as the relative humidity (often abbreviated to URi in the following).
  • the initial temperature Ti can - depending on the operative choices and the type of leather to be treated in the drum - be kept constant during the whole drumming cycle, thus becoming in all respects the working temperature (indicated in the following with Ti, again for exhibition convenience) or, as more preferable, be gradually increased until reaching the working temperature Ti which has been pre-set by the operator and which subsequently remains constant during the remaining part, the most salient for duration, of the drumming cycle.
  • the drumming cycle which, in the initial stages, provides a gradual increase in temperature from an initial value Ti to a final value Ti when fully operational is more indicated and preferred since the speed with which the drum reaches the optimal working temperature depends on (or, in other words, is different depending on) various factors, such as:
  • the ambient temperature in a production factory is on average 15°C while in summer such an ambient temperature reaches 30 °C and, assuming in both cases to reach 40 °C, the followed heating curve is therefore more pending in the first case than in the second one.
  • main purpose of the present invention is to implement a method for adjusting the formula parameters of a drumming cycle of tannery leathers, which in the initial stage of the drumming cycle takes into account the actual conditions in which the "rotating drum" system is as a whole.
  • the method for adjusting the formula parameters of a drumming cycle of tannery leathers allows to achieve savings in electrical energy (necessary for the operation of the rotating drum during a given drumming cycle) with respect to the comparable methods of the prior art.
  • the initial temperature Ti is therefore free, not pre-set, in the method of the invention, and the heating curve will be calculated subsequently, preferably automatically by a processing and control program.
  • the method for adjusting the formula parameters of a drumming cycle of leathers of the current invention by safeguarding the consumption of electric energy in the initial stage of the drumming cycle, gets an improvement of the production costs associated with it with respect to the prior art, other factors involved in the calculation of the total production cost being equal.
  • the method for adjusting the formula parameters of a drumming cycle of leathers of the invention occurs without acting invasively and onerously on the components of the rotating drum with which it is implemented.
  • the method for adjusting the formula parameters of a drumming cycle of leathers of the present invention is more efficient than similar methods of the known type.
  • the method for adjusting the formula parameters of a drumming cycle of leathers considered herein comprises, according to practice, the following operations:
  • the method comprises the following further operations:
  • the linear axis around which the cylindrical barrel rotates is, preferably, substantially horizontal.
  • the leathers to be drummed are substantially equal each other by type and/or come from a same given production batch, in such a way that the production is as uniform and homogeneous as possible.
  • the operation of detecting the effective temperature T e into the cylindrical barrel of the rotating drum is performed by means of thermometer associated (under the operating profile) to a dust collector which, as known in the tanning sector, is operatively connected with such a cylindrical barrel.
  • thermometer can be arranged indifferently, depending on the applicative requirements of the customer and/or the constructive choices of the manufacturer, inside or outside the dust collector.
  • the operation of detecting the effective temperature T e inside the aforesaid cylindrical barrel determines the resultant of the temperature Tt of the cylindrical barrel itself, which is in contact with the external environment (the production factory) in which it is contained, and of the temperature T p of the leathers contained into the cylindrical barrel, which as said can be sometimes introduced rather hot inside the latter due to the previous processing to which they have been subjected.
  • the operation of setting the initial time interval of the drumming cycle is performed manually by an operator acting on the rotating drum or, alternatively, it occurs automatically by means of a central processing and control unit associated with the rotating drum which controls its operation and which, in the specific case, calculates the initial time interval on the basis of the data preset by the operator stored and/or memorized in it.
  • the initial temperature of the drumming cycle is variable, not fixed a priori in an arbitrary manner, and solely depends on the effective temperature T e detected into the cylindrical barrel.
  • the initial time interval of the drumming cycle is variable and solely depends on the effective temperature T e detected into the cylindrical barrel that indicates which temperature difference must be in order to reach the working temperature (or operating temperature) T l when fully operational.
  • the actual relative humidity UR e in the cylindrical barrel is also determined, this quantity being (as known) closely related to the temperature and increasing as the temperature decreases in a closed system which indeed a rotating drum in operation is.
  • the primary technical concept underlying the current invention method consists in significantly, surprisingly and originally innovative overturning a consolidated operating practice in a drumming cycle of leather performed in the tanning sector, providing, in the extreme synthesis, to measure in real time the initial temperature inside the rotating drum and to set, as a consequence, the time interval needed to reach the working temperature at steady starting from the effective temperature detected rather than setting a generic, determined, hypothesized, hypothetical and, although accurate, always empirical initial temperature at the operator's discretion, as it happens instead in the current state of the art: this allows to get, through the invention, significant savings of electricity that reflect in an always welcome and convenient containment of production costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Treatment Of Fiber Materials (AREA)
EP18749548.6A 2017-07-04 2018-07-03 Method for adjusting the formula parameters of a drumming cycle of leathers Active EP3649263B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000074937A IT201700074937A1 (it) 2017-07-04 2017-07-04 Metodo per la regolazione dei parametri di una ricetta di un ciclo di bottalatura di pelli
PCT/IB2018/054918 WO2019008510A1 (en) 2017-07-04 2018-07-03 METHOD FOR ADJUSTING FORMULA PARAMETERS OF A LEATHER LUSTERING CYCLE

Publications (2)

Publication Number Publication Date
EP3649263A1 EP3649263A1 (en) 2020-05-13
EP3649263B1 true EP3649263B1 (en) 2021-05-19

Family

ID=60628008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18749548.6A Active EP3649263B1 (en) 2017-07-04 2018-07-03 Method for adjusting the formula parameters of a drumming cycle of leathers

Country Status (3)

Country Link
EP (1) EP3649263B1 (it)
IT (1) IT201700074937A1 (it)
WO (1) WO2019008510A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900016694A1 (it) * 2019-09-19 2021-03-19 Erretre Spa Metodo di trattamento di pelli mediante bottalatura

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE97423C (it) * 1900-01-01
US1623943A (en) * 1923-05-31 1927-04-05 George S Neeley Leather-treating process and apparatus for same
DE3030017C2 (de) * 1980-08-08 1982-09-16 Ludwig Dose Millvorrichtung für Leder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2019008510A1 (en) 2019-01-10
IT201700074937A1 (it) 2019-01-04
EP3649263A1 (en) 2020-05-13
BR112019027212A2 (pt) 2020-06-30

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