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1、INTERNATIONAL STANDARD First edition 1991-03-01 Cylindrical stoppers of natural cork - Physical tests - Reference methods Bouchons cylindriques en liege nature/ - EssaCz physiques - Mkthodes de rGf deviations from parallelism of bases and from perpendicularity of sides and bases: ap- parent density;
2、 moisture content; behaviour under compression; extraction and penetration strengths; absorption; and capillarity? Unless otherwise agreed between purchaser and vendor the size of the sample and the acceptable quality level shall be in accordance with IS0 2859-1, IS0 3952, and IS0 4707. 4 Reagents 4
3、.1 Ethanolic solution, 10 % (V/v). 4,2 Coloured2) ethanollc solution, 10 % (V/v). 5 Apparatus 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indi
4、cated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently va
5、lid International Standards. 5.1 Apparatus, (see figureI), to measure dimen- sions and angles of inclination of bases, and check base parallelism of stoppers, consisting of 5.1.1 Rectangular base, in transparent acrylic plas- tic, dimensions 220 mm x 220 mm, fitted with four levelllng-screws. 5.1.2
6、Plate, in stainless steel, dimensions 170 mm x 150 mm x 9 mm, fitted with two upright cylindrical stainless steel rods, 200 mm high and 10 mm diameter. These rods are perpendicular to the plate and 120 mm apart (measured from centre to centre). This plate fits completely into the base (5.1 .I). IS0
7、2859-1:1989, Sampling procedures for inspection by attributes - Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot in- spection. 5.1.3 Two dial-gauges, with a measuring range of 50 mm and a resolution of 0,Oi mm, with forked plunger ends and rotary dials for zero setting
8、. IS0 3951:1989, Sampling procedures and charts for inspecfion by variables for percent nonconforming. IS0 4707:1981, Cork - Stoppers - Sampling for in- spection of dimensional characteristics. 1) Sealing behaviour will be covered later. 2) Orange II. 5.1.4 Two supports, with a circular opening in o
9、ne end through which passes one of the cylindrical rods referred to in 5.1.2. The supports are fixed to the rods by screws. The other end of the supports is fixed to the inside of roller bearings set on the 1 Copyright International Organization for Standardization Provided by IHS under license with
10、 ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:01:35 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9727:1991 (E) covers of the dial-gauges (5.1.3); the supports and the dial-gauges can be screwed together. 5.1.5 Ruler, stainless stee
11、l, length 130 mm, with a reference point in its centre, fixed by the forked plunger ends referred to in 5.1.3. The contact of the ruler to the plate (5.1.2) corresponds to the zero of the dial-gauges. 5.1.6 Accessory, consisting of a stainless steel cyl- inder in which a cut is made defined by two h
12、alf- surfaces vertical in relation to the bases, with the origin in the cylinder axis and with an angle of ap- proximately 60”. 5.2 Balance, accurate to + 0,l mg 5.3 Cutting-dies. 5.4 Oven, with thermostat control and air circu- lation controlled at 103 “C + 2 “C. 5.5 Desiccator. 5.6 Dynamometric pr
13、ess, with fixed head and mov- able base, moving at speeds of 1 cm/min and 30 cm/min (see figure 2), equipped with 5.6.1 5.6.2 5.6.3 Sensor, jointed to the fixed head. Measure and control unit. Potentiometric recorder. 5.7 Bottles, with “plate unique” finish (diameters 18.5 mm f 0,5 mm)3). 5.8 Bottli
14、ng machine, with four jaws of polished metal capable of pressing the stopper into a cylin- drical form to a diameter 2 mm smaller than that of the bottle finish. 5.9 Apparatus for compression test, (see flgure3), consisting of 5.9.1 Device, in stainless steel, to support the stopper on the movable b
15、ase of the press (5.6), for the compression test (see figure 3). Unless otherwise specified tests shall be carried out on corks conditloned for 24 h at a temperature of 20 “C _+ 2 “C and a humidity of 65 “C f 5 %. 3) See CETIE Standards. 4) Whatman No. 4 is the trade-name of a product supplied comme
16、rcially. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by IS0 of the product named. Equivalent products may be used if they can be shown to lead to the same results. 5.9.2 Rectangular indentor, 50 mm x 20 mm, con- nected
17、to the sensor (5.6.1) by a stainless steel rod. 5.9.3 Dial-gauge, graduated in 0,l mm, accurate to f 0,Ol mm, capable of moving parallel to the mova- ble base of the press (5.6), which shall support the indentor. 5.10 Device, for the determination of extraction and penetration strength (see figure 4
18、 and figure 5), con- sisting of 5.10.1 Fixing device, for fixing the bottle to the movable base of the press (see figure 4). 5.10.2 Corkscrew, stainless steel, with a penetrat- ing helicoidal stick, thread between 12 mm and 14 mm, length greater than 60 mm, and with 5 or 6 helices with at least a 3
19、mm internal diameter and 10 mm to 15 mm external diameter. The corkscrew shall have a triangular handle capa- ble of being turned manually. 5.10.3 Connecting device, to the sensor and to the corkscrew handle, which ensures that the perpendicularity between the extraction device and the movable base
20、Is maintained. 5.11 Punch, capable of being adjusted to the sen- sor in order to Insert the cork stopper into the bottle by sliding it through its neck (see figure 5), with 1 cm2 of surface contact with the cork stopper. 5.12 Open container, to hold the coloured ethanolic solution (4.2). 5.13 Filter
21、 paper, Whatman No. 44J. 5.14 Ruler, with an accuracy of 0,5 mm. 6 Normal test conditions 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:01:35 MDTNo reproduction or network
22、ing permitted without license from IHS -,-,- IS0 9727:1991 (E) 7 Tests 7.1 Dimensions, deviations from parallelism of bases, and from perpendicularity of sides and bases 7.1.1 Setting up the apparatus (5.1) Place the ruler (5.1.5) on the plate (5.1.2). Adjust the position of the two supports (5.1.4)
23、 for an approxi- mate setting of zero in the comparators. Screw the supports to the rods and adjust the zeroes in the dial-gauges by means of the turning dials. To ensure that the rods are perpendicular adjust the ruler one way and then the other; the vertical pos- ition corresponds to the minimum v
24、alue given by the comparators, Fix only one of the dial-gauges to its support with the corresponding screw. 7.1.2 Deviation from perpendicularity of sides and bases 7,1.2.1 Procedure for testing Tests to be carried out on stoppers tested in 7.1.3, Place the apparatus (5.1) on a table with a horizont
25、al top. Place each stopper inside the accessory (5.1.6) and fix it with adhesive tape so that the base of the cork stopper is higher than the base of the acces- sory. Place the ruler (5.1.5) on the cork along its di- ameter. Read out the result on both dial-gauges. Rotate the cork 90” and repeat the
26、 procedure. 7.1.2,2 Results The deviation from perpendicularity in the first pos- ition is G-z2 0, = arcsin ( 120 where 2, and 2, are the readings on both dial- gauges, resulting from measurement in the first position. The deviation from perpendicularity in the second position (position at a right a
27、ngle to the first) is where 2, and 2, are the readings on both dial- gauges, resulting from the measurement in the sec- ond position, The deviation from perpendicularity in relation to the base, is y,= p1-tp2 2 The deviation from perpendicularity of sides and the other base Is y2= P3fP4 2 where Pa a
28、nd p4 are the new deviations measured when the cork stopper is released from the appara- tus and turned upside down. The average deviation from perpendicularity be- tween generating lines and bases is Yl+Yr Y= 2 The result of the test for each cork stopper in the sample shall be expressed in degrees
29、, rounded off to the nearest 0,V. 7.1,3 Length and deviation from parallelism of bases 7.1.3.1 Procedure Place the apparatus (5.1) on a table with a horizontal top. Place each cork from the sample on the plate (5.1.2) under the ruler (5.1.5) in its central area, on one of Its bases. Read out the res
30、ult on both comparators. Rotate the cork stopper 90” and repeat the procedure. 7.1.3.2 Results The average length of the cork stopper in the first position Is Kf+K2 *I= 2 and the deviation from parallelism of the bases for this first position is (x1 = arcsin( *) where Kl and 2 are the readings on bo
31、th dial- gauges, resulting from the measurement of the first position. The average length of the cork stopper in the second position Is K3+-K4 4= 2 and the deviation from parallelism of the bases for this second position is a2 = arcsin( 3) 3 Copyright International Organization for Standardization P
32、rovided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:01:35 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 9727:1991 (E) The average length of each cork stopper is 1 = 4 + 2 2 and the angular deviation from p
33、arallelism of the bases of the cork stopper is at +a2 a=- 2 The result of the test for each cork stopper in the sample shall be expressed in millimetres, rounded off to the nearest 0,l mm for the length, and in de- grees, rounded off to the nearest 0,l” for the devi- ation from parallelism of bases.
34、 7.1.4 Diameter5) 7.1.4.1 Procedure Test the cork stoppers tested in 7.1.2 Place the apparatus (5.1) on a table with a horizontal top. Put each cork stopper under the ruler (5.1.5), in its central area, on one of its sides. Read both dial- gauges. Rotate the cork stopper 90” and repeat the procedure
35、. 7.1.4.2 Results The average diameter of the cork stopper in the first position is d 1 = Yl + y2 2 where Y, and Y, are the readings on both dlal- gauges, resulting from the measurement of the di- ameter of the cork stopper in the first position. The average diameter of the cork stopper in the secon
36、d position d 2 = y3 + y4 2 where Ys and Y4 are the readings on both dial- gauges, resulting from the measurement of the di- ameter of the cork stopper in the second position. The average diameter of each cork stopper is d= d1+d2 2 The result of the test for each cork stopper of the sample shall be e
37、xpressed in millimetres, and rounded off to the nearest 0,l mm. 7.2 Apparent density 7.2.1 Procedure Determine, using the balance (5.2), the mass of each cork in the sample; their dimensions being deter- mined in accordance with 7.1.3 and 7.1.4. 7.2.2 Results The apparent density of each cork stoppe
38、r, ex- pressed in kilograms per cubic metre is m 4X- d2 x I x IO“ where m is the mass of each cork stopper, in grams, rounded off to the nearest 1 mg; d is the diameter of each cork stopper, in mllllmetres, rounded off to the nearest 0,l mm; I is the length of each cork stopper, in mllllmetres, roun
39、ded off to the nearest 0,l mm. The apparent density for each cork stopper in the sample shall be expressed in kilograms per cubic metre, rounded off to the nearest integer. 7.3 Moisture contentB) 7.3.1 Procedure Use the dies (5.3) to cut each cork stopper from the sample weighed in 7.2, ir?to four p
40、ieces, through their diameters. Place the pieces in the oven (5.4) set at 103 “C + 2C for 3 h. Remove the cork stopper pieces from the oven and place them in the desiccator (5.5) for 30 min. Weigh them once more. 7.3.2 Results The moisture content of each cork stopper, ex- pressed as a percentage is
41、 m, - m m, where % is the initial mass of each cork stopper, determined in 7.2, in grams, rounded off to the nearest 1 mg; 5) This method is considered as a reference method. It may either be used as a gauge, or the apparatus (5.1) can be used as the calibrator. 6) This test does not require prior c
42、onditioning. 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:01:35 MDTNo reproduction or networking permitted without license from IHS -,-,- I?4 is the mass of each-dried co
43、rk stopper, in grams, rounded 1 mg. off to the nearest cork stopper in the as a percentage, The moisture content of each sample shall be expressed rounded off to the nearest 1 %. 7.4 Behaviour under compression over a period of time 7.4.1 Procedure Place each cork stopper on the device (5.61) which
44、is placed on the movable base of the press (5.6) so that an angle of 45” is made between the veins and the indentor base (59.2). Adjust the indentor to the sensor (56.1) and move the dial-gauge (5.63) in such a way that. the indentor will be applied on the cork stopper and set the dial- gauge to zer
45、o. Start the movable base at a speed of 1 cm/min. When the dial-gauge reads 33 % of the diameter value ofthe cork stopper, read on the measure and control unit (5.6.2) the corresponding compression strength (F,). After 1 h7) again read the compression strength (F2). The recorder (5.6.3) registers th
46、e curve correspond- ing to the function F(r). 7.4.2 Results The result of the test is given by the forces PI, Js, and the difference F, - F2 where Fl is the compression force corresponding to a reduction of 33 % of the cork stopper diameter, in decanewtons, and rounded off to the nearest 0,l daN; F2
47、 is the compression force, 1 h after read- ing F, in decanewtons, and rounded off to the nearest O,l daN. IS0 9727:1991 (E) 7.5 Behavlour under compression after bottling 7,5,1 Procedure Place a cork stopper on the device (5.9.1) which is placed on the movable base of the press (5.6) so that an angl
48、e of 45” is made between the veins and the indentor base (5.62). Adjust the lndentor in the sensor (5.6.1) and move the dial-gauge (5.63) so that the indentor will be applied on the movable base of the press, setting the dial-gauge to zero. Start the movable base at a speed of 1 cm/mln. When the dia
49、l-gauge reads a value equal to the di- ameter (d,) of the bottling machine jaws, record the corresponding compression strength (Fe). Quickly relieve the press in order to obtain cork expansion, and read on the- dial-gauge a value equal to the average Internal diameter of the bottle neck W,)* After 2 mitt, read the reaction strength F, and re- cord during this time the curve corresponding to the cork stopper relaxation during this perio