EP1043157A2 - Ein integriertes System für das Auswerten des Restlösungsmittels enthalten in Verpackungsfilmen während des Druckprozesses in den Produktionsanlagen - Google Patents

Ein integriertes System für das Auswerten des Restlösungsmittels enthalten in Verpackungsfilmen während des Druckprozesses in den Produktionsanlagen Download PDF

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Publication number
EP1043157A2
EP1043157A2 EP00106883A EP00106883A EP1043157A2 EP 1043157 A2 EP1043157 A2 EP 1043157A2 EP 00106883 A EP00106883 A EP 00106883A EP 00106883 A EP00106883 A EP 00106883A EP 1043157 A2 EP1043157 A2 EP 1043157A2
Authority
EP
European Patent Office
Prior art keywords
sample
analyser
cutting punch
chamber
residual solvent
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.)
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Application number
EP00106883A
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English (en)
French (fr)
Other versions
EP1043157A3 (de
Inventor
Roberto Cerutti
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.)
CERUTTI SPIRITO IMPIANTI Srl
Original Assignee
CERUTTI SPIRITO IMPIANTI 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 CERUTTI SPIRITO IMPIANTI Srl filed Critical CERUTTI SPIRITO IMPIANTI Srl
Publication of EP1043157A2 publication Critical patent/EP1043157A2/de
Publication of EP1043157A3 publication Critical patent/EP1043157A3/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices

Definitions

  • the present invention concerns an integrated system for evaluating the residual solvent contained in packaging films during the printing process at the manufacturing plants.
  • the prior art manufacturing plants generally comprise an unwinder 1 of the reel to be worked, a set of inking groups 3, each equipped with heated chambers for solvent vaporisation, and a rewinder 5 of the finished product (see Fig. 1).
  • the determination of the residual solvent is carried out in laboratories by using an analytical system generally comprising a headspace sampler or thermal desorption unit coupled with a gas chromatograph.
  • an operator takes a film piece 7, seals it into an envelope (usually of aluminium) and sends the piece to the laboratory.
  • a sample 9 (usually, a square or round sample with an area of about 100 cm 2 ) is obtained by means of a punch.
  • Sample 9 thus obtained is inserted into a test tube 11 having a pierceable septum.
  • test tube 11 is inserted into a headspace sampler 13 or desorption unit and incubated for about 10 to 30 minutes. During this time, solvent migration to the air within the tube takes place. The analysis of that air provides data 15 about the residual solvent concentration in the product.
  • the above system for determining the residual solvent is particularly laborious and generally time consuming; also, the analysis equipment demand complex calibration procedures, where error possibility is not unlikely. Indeed, it is necessary to manually prepare some vials with known concentration by injecting a quantity of sample gas dosed through a syringe. All this is not of assistance in the manufacturing process since the analysis results are known after the working has been completed. If the values are not within prescribed law limits, the finished product has to be worked again or discarded.
  • the system of the invention substantially comprises two elements, namely:
  • said analyser can be coupled with a printer for printing the analysis certificate or with a host computer for data transfer.
  • Fig. 1 shows the way of operation according to the prior art. Said prior art has been already disclosed at the beginning of the present specification and repeating it is not necessary. Only some key features of the prior art method, present in the diagram of Fig. 1, are recalled now.
  • Fig. 2 shows on the contrary the method according to the present invention.
  • References 1, 3 and 5 denote the reel unwinder, the seat where the printing process takes place, and the rewinder, respectively, like in Fig. 1.
  • upstream rewinder 5 a device 17 is provided for automatically taking the calibrated film sample 19, which is sent to a single analyser 21, which will provide the analysis result 23, i. e. the measure of the residual solvent.
  • Fig. 3 shows an embodiment of the device for automatically taking film samples from a reel being worked.
  • said device 17 is located in the vicinity of rewinder 5 and, more precisely, between the last printing unit and the rewinder.
  • the device can also be mounted on the crosspieces or shoulders of said rewinder 5.
  • Device 17 consists of two side members 22, of suitable sizes, which bear two idle rollers 25 allowing an optimal winding of film 20 onto a cutting punch contrasting roller 27 coated with a synthetic material.
  • Said sample 19 is automatically ejected immediately after having been cut and is collected in a suitable basket in the reach of the operator.
  • Cutting is pneumatically controlled through the action of two short-stroke compact cylinders 35, by means of a compressed air pulse determined by a valve driven by the operator.
  • Two pneumatic cylinders 37 control the lifting of the cutting punch holding roller 29 so as to allow the guided introduction of the material to be processed, and such operation is made easier by a hand driven chain device 38 for such guided introduction.
  • Cutting punch 39 made of treated steel, is mounted on a removable sleeve 41, which allows locating the cutting punch along the whole film width.
  • a set of adjusting points (not shown) allows realigning cutting punch 39 onto sleeve 41 when the punch is removed for being sharpened or replaced.
  • a set of pressure rollers 43 arranged so as to be tangent to cutting punch contrasting roller 27 ensures the adhesion of film 20 to said roller in order the drawing action of the roller is made more effective. It is to be appreciated that the whole device 17 is made to rotate by the film itself thanks to the drawing action of the rotary press.
  • Said analyser 21 essentially consists of a thermostatic chamber 49, housing incubation room 51 for sample 19, sampling "loop” or valve 53, separation column 55 and flame ionisation detector (FID) 57.
  • a pressure sensor 59 is connected, in said thermostatic chamber 49, to a point between the sampling loop 53 and incubation chamber 51.
  • Analyser 21 also comprises a set of ducts and valves, such as a duct 61 for the inlet of calibration gas with an associated electric valve 63, a duct 65 for the inlet of washing pressurisation gas with an associated electric pressurisation valve 67 and a pressure regulator 69; and a duct 71 for the inlet of carrier gas.
  • a set of ducts and valves such as a duct 61 for the inlet of calibration gas with an associated electric valve 63, a duct 65 for the inlet of washing pressurisation gas with an associated electric pressurisation valve 67 and a pressure regulator 69; and a duct 71 for the inlet of carrier gas.
  • Duct 65 is provided, in the downstream branch, with an electric valve for communication with the atmosphere, whereas duct 61 is equipped, downstream the incubation chamber 51, with an electric valve 75 for washing said chamber.
  • sample 19 of film 20 to be analysed is placed into incubation chamber 51 and hermetically sealed. During this phase, valves 63, 67, 73 are closed, thereby forming a closed environment comprising incubation chamber 51 and sampling loop 53.
  • Incubation chamber 51 has a known volume of about 20 cm 3
  • the sampling loop has a volume of 1 cm 3 . It is to be appreciated that said sampling loop 53 indeed comprises a loading loop 53a and an actual sampling loop 53b.
  • sample 19 of film 20 when heated, releases its residual solvent within incubation chamber 51 during a pre-set time interval, or incubation time.
  • a sensor 59 is capable of measuring a pressure increase, if any, within incubation chamber 51 because of solvent release by film 20.
  • valve 67 is opened and the environment composed of chamber 51 and loop 53a is brought to a pressure pre-set by regulator 69, which usually is not provided for in the systems at present in use.
  • pressurisation phase clean air (zero air) is fed to inlet 65. That phase is referred to as pressurisation.
  • pressurisation phase causes a certain dilution of the gas within the closed environment. That dilution is proportional to the difference between the pressures before and after the pressurisation phase, and is a system constant.
  • valve 67 is closed and valve 73 is opened.
  • the pressurised gas breathes out through vent outlet 73 and fills loop 53a.
  • This phase is referred to as loop-filling phase.
  • sampling valve 77 is actuated and the content of loop 53a is brought to position 53b (sampling position).
  • Carrier gas (zero air) fed to inlet 71 pushes the residual solvent extracted, contained in loop 53b, up to detector 57 through separation column 55.
  • the solvent extracted when reaching detector 57, is burnt by the detector flame. Combustion of carbon atoms present in the solvent results in an ionic current in the flame. Said current is detected and amplified and forms the measurement signal. Said measurement signal is as shown in fig. 5, where voltage values (V) are plotted on the Y axis whereas the times of arrival of the solvent at the flame are plotted on the X axis.
  • V voltage values
  • Y axis the times of arrival of the solvent at the flame are plotted on the X axis.
  • Analyser 21 is calibrated through a standard gas bottle with known concentration, connected to inlet 61. During said calibration phase, valves 63 and 75 are opened, so that incubation chamber 51 is filled with said reference gas. An analysis cycle (already described) is then carried out and a signal peak is obtained, the area of which is proportional to the calibration gas concentration. That area is stored within analyser 21 together with the gas concentration in the reference bottle. Those values form the reference for all subsequent measurements.
  • Measurement of the residual solvent concentration may take place according to two operating modalities:

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  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Sampling And Sample Adjustment (AREA)
EP00106883A 1999-04-02 2000-03-31 Ein integriertes System für das Auswerten des Restlösungsmittels enthalten in Verpackungsfilmen während des Druckprozesses in den Produktionsanlagen Withdrawn EP1043157A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO990262 1999-04-02
ITTO990262 IT1307238B1 (it) 1999-04-02 1999-04-02 Sistema integrato per la valutazione del solvente residuo nellepellicole da imballo nei reparti di produzione durante il processo di

Publications (2)

Publication Number Publication Date
EP1043157A2 true EP1043157A2 (de) 2000-10-11
EP1043157A3 EP1043157A3 (de) 2001-05-02

Family

ID=11417698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00106883A Withdrawn EP1043157A3 (de) 1999-04-02 2000-03-31 Ein integriertes System für das Auswerten des Restlösungsmittels enthalten in Verpackungsfilmen während des Druckprozesses in den Produktionsanlagen

Country Status (2)

Country Link
EP (1) EP1043157A3 (de)
IT (1) IT1307238B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519159A (en) * 1948-05-04 1950-08-15 United Eng Foundry Co Apparatus for sampling strip material
US4577516A (en) * 1983-06-17 1986-03-25 Stork Brabant B.V. Device for taking a sample from a continuously advancing web
DE4442240A1 (de) * 1994-11-28 1996-05-30 Fogra Forschungsgesellschaft D Verfahren und Vorrichtung zur Bestimmung der Menge eines aus einem Druckprodukt austretenden Lösungsmittels
US5792423A (en) * 1993-06-07 1998-08-11 Markelov; Michael Headspace autosampler apparatus and method
WO1999039175A1 (fr) * 1998-01-29 1999-08-05 Thierry Zesiger Dispositif pour la qualification de produits contenant des substances volatiles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519159A (en) * 1948-05-04 1950-08-15 United Eng Foundry Co Apparatus for sampling strip material
US4577516A (en) * 1983-06-17 1986-03-25 Stork Brabant B.V. Device for taking a sample from a continuously advancing web
US5792423A (en) * 1993-06-07 1998-08-11 Markelov; Michael Headspace autosampler apparatus and method
DE4442240A1 (de) * 1994-11-28 1996-05-30 Fogra Forschungsgesellschaft D Verfahren und Vorrichtung zur Bestimmung der Menge eines aus einem Druckprodukt austretenden Lösungsmittels
WO1999039175A1 (fr) * 1998-01-29 1999-08-05 Thierry Zesiger Dispositif pour la qualification de produits contenant des substances volatiles

Also Published As

Publication number Publication date
ITTO990262A1 (it) 2000-10-02
IT1307238B1 (it) 2001-10-30
EP1043157A3 (de) 2001-05-02

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