BS EN 768:1994 pdf free download.Sacks for the transport of food aid Sacks made of lined cotton fabric.
1 Scope
BS EN 768 specifies the general characteristics, requirements and methods of test for sack8 made of lined cotton fabric.
BS EN 768 is applicable to sacks made of lined cotton fabric, having a filling mass up to 50 kg, intended for the transport of food aid.
2 Normative references
BS EN 768 incorporates by dated and undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references subsequent amendments to. or revisions of, any of these publications apply to BS EN 768 only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 765:1994, Sacks for the transport of food aid — Socks made of woven polyolefin fabric other than polypropylene only.
prEN 1086:1993, Sacks for the transport of food aid — Recommendations on the selection of type of sack and the liner in relation to the product to be packed.
EN 22206:1992, Packaging — Complete, filled transport packages — Identification of parts when testing. (ISO 2206:1987)
EN 22233:1992, Packaging — Complete, filled transport packages — Conditioning for testing.
(ISO 2233:1986)
EN 26590.1:1992, Packaging — Sacks — Vocabulary and t.pes — Part 1: Paper sacks. (ISO 6590-1:1983)
EN 26590-2:1992, Packaging — Sacks — Vocabulary and types — Part 2: Sacks made from thermoplastic flexible film.
(ISO 6590-2:1986)
EN 26591 .2:1992, Packaging — Sacks — Description and method of measurement — Part 2: Empty sacks made from thermoplastic flexible film. (ISO 6591.2:1985)
EN 27023:1992, Packaging — Sacks — Method of sampling empty sacks for testing.
(ISO 7023:1983)
EN 27965.4:1992, Packaging — Sacks — Drop test — Part 1: paper sacks. (ISO 7023:1983)
ISO 3676:1983, Packaging — Unit load sizes — Dimensions.
3 Definitions
For the purpose of BS EN 768, the following definitions apply:
NOTE Other terms used in the manufacture of sacks are
e defined in EN 26590.1 for paper sacks and in EN 26590.2 for
sacks made of thermoplastic flexible film. Most of these terms can also be applied to sacks made of lined cotton fabric.
lined cotton sack
a container made of cotton fabric, closed at least at one end, in combination with other flexible
materials used for the liner, to provide the properties required for filling and the goods distribution chain
NOTE Hereafter where the word sack is used in the text of BS EN 768, a sack made of lined cotton fabric is to be understood,
3.2
ply
a tissue of cotton fabric, forming the outside walls of the sack or another material forming the inside
walls of the sack
3.3
gusset
a fold inserted in the longitudinal edge of the sack
4 General characteristics
4.1 Construction
4.1.1 The sack shall be made of cotton fabric.
4.1.2 The sack shall be made of one ply or more plies and shall be equipped with a liner in accordance
with prEN 1086.
4.1.3 The sack may be flat or gusseted.
4.1.4 The empty sack, laid flat, shall have a rectangular shape.
4.1.5 The closure of the filled sack shall be designed to prevent leakage of the product during transport.
4.1.6 Materials other than natural materials used in the manufacture and closure of the sack (inner liner excluded) shall have a UV.rcsistance in accordance with 5.7.3 of EN 765:1994. These materials can be tested in the construction in which they are used in the sack.
4.2 Dimensions
4.2.1 The dimensions of the empty sack shall be chosen so that, if necessary, after filling the
dimensions of the filled sack comply with the
dimensions of the unit load as specified in Iso 3676.
4.2.2 The dimensional tolerances of the sack should be agreed upon between the purchaser and the
supplier.
4.2.3 The dimensions and the dimensional tolerances of the sack shall be recorded in the ordering documents.
4.2.4 The description of the dimensions, the method of measuring the dimensions and the dimensional designation of the sack shall be in accordance with
EN 26591.2.
NOTE Though EN 26591.2 is valid for sacks made of thermoplastic flexible film it can be applied to sacks made of cotton fabric. However for some forms of sacks made of polyolefin fabric EN 26591.2 cannot be applied. A third part. of ISO 6591 will be prepared by ISOITC 1221SC2, Packaging — Sacks. This third part will deal with sacks made of woven fabric.
4.3 Food compatibility
Sacks which come in contact with foodstuffs shall meet the legal requirements of the CEN member states which are applicable to them.
5 Test methods and test requirements
5.1 Sampling
5.1.1 The sampling shall be done in accordance with
EN 27023.
NOTE Table 1 of EN 27023:1992 refers to the selection of units. Table 2 of EN 27023:1992 refers to the selection of sacks out of each selected unit.
5.1.2 The sampling shall be done on the date the empty sacks are ready for dispatch by the supplier.
5.1.3 If resampling is necessary it shall be done in accordance with EN 27023.
If, as a result of an accident during sampling or testing, resampling is necessary, a new sample shall be taken following the procedure specified in EN 27023. Selection may then, however, be made from the same units as before unless agreed otherwise.
If, for any other reason, resampling is necessary, the procedure agreed shall follow the specification of EN 27023 as closely as possible.
5.2 Conditioning
5.2.1 Before testing all samples shall be conditioned in accordance with EN 22233:1992 condition G temperature + 23 °C ± 2 °C, relative humidity 50 % ± 5 %).
5.2.2 The minimum period of conditioning of the samples shall be not less than 8 h.
5.2.3 The various tests as described shall be carried out in the same atmospheric conditions as used for conditioning, see 5.2.1, or, if not possible, the tests shall commence within 10 mm after removing the samples from the conditioning atmosphere.
5.3 Surface identification
If necessary the identification of the various surfaces of the filled sacks when testing shall be as given in EN 22206.
5.4 Date of completion of the tests
All tests shall be completed within four weeks after the date the empty sacks are ready for dispatch by the supplier.
5.5 Drop test
5.5.1 Test method
The drop test shall be carried out in accordance with EN 27965-1:1992 using the constant drop height method.
5.5.2 Filling of the sacks
The sacks shall be filled with the intended commodity or. if this is not possible. with similar material, taking into account type and size of granules etc.. to give the same degree of filling. The mass of the filling material shall be within ± 0,2 % of that of the nominal mass of the intended contents of the sack.
5.5.3 Test procedure
5.5.3.1 Drop test sequence
The drop test shall be carried out on three sacks and shall comprise the following sequence:
a) butt dropping; b) flat dropping.
5.5.3.2 Butt dropping
The sack shall be dropped from a height of 1,20 m on the bottom of the sack.
5.5.3.3 Flat dropping
The sack shall be dropped from a height of 1,60 m, twice on one flat face and twice on the opposite flat face.
5.5.4 Criteria for passing the drop test After each drop there shall be no rupture or loss of contents.
A slight discharge, e.g. from closures or stitch holes, upon impact shall not be considered a failure of the sack provided that no further leakage occurs after the sack has been raised clear of the ground.
6 Marking
The marking of the sack with the supplier identification is voluntary.
7 Test report
The test report shall include a statement that all tests have been carried out in accordance with BS EN 768 and shall include at least the following information:
a) name and address of the supplier;
b) number of the contract or order reference;
c) date, place and description of the sampling;
d) description of the sacks in accordance with 4.2.4 of this European Standard;
e) description of the filling material used for testing;
f) intended net mass in kg;
g) results of and comments on the drop test;
h) any deviations from the test methods given in BS EN 768:
i) name and address of the tester;
j) signature of the tester;
k) date of the test.