BS EN 770:1994 pdf free download.Sacks for the transport of food aid Paper sacks.
1 Scope
BS EN 770 specifies the general characteristics, requirements and methods of test of paper sacks.
BS EN 770 is applicable to paper sacks, having a filling mass up to 50 kg, intended for the transport of food aid.
2 Normative references
BS EN 770 incorporates by dated or 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 770 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 — Sacks made of woven polyole fin fabric other than polypropylene only.
prEN 1086:1993, Sacks for (lie 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 types — Part 1: Paper sacks.
(ISO 6590-1:1983)
EN 26591-1:1992, Packaging—Sacks— Description and method of measurement — Part l. Empty paper sacks. (ISO 6591.1:1984)
EN 27023:1992, Packaging — Sacks — Method of sampling empty sacks for testing. (ISO 7023:1983)
EN 27965-1:1984, Packaging — Sacks — Drop test — Part 1: Paper sacks. (ISO 7965-1:1984)
ISO 1924-2:1985, Paper and board — Determination of tensile properties — Part 2: Constant rate of elongation method.
ISO 3676:1983, Packaging — Unit load sizes — Dimensions.
3 Definitions
For the purpose of BS EN 770, the definitions of EN 26590-1 apply.
NOTE Hereafter where the word “sack” is used in the text of this European Standard, a paper sack is to be understood.
4 General characteristics
4.1 Construction
4.1.1 The sack shall be made of sackpaper.
4.1.2 The sack shall be made of one ply or more plies and may be equipped with a liner in accordance with prEN 1086.
4.1.3 All types of EN 26590-1 may be used.
4.1.4 The closure of the filled sack shall be designed to prevent leakage of the product during transport.
4.1.5 Materials other than natural materials used in the manufacture and closure of the sack (inner liner excluded) shall have a UV-resistance 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 26591-1.
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, resamplingis 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 followed shall follow the specifications 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 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 Determination of the quality of sackpaper The quality of the paper is expressed in the Tensile Energy Absorption (TEA) which is to be calculated with the formula:
TEAvge = (TEAj() * where
TEANII) is the TEA in machine direction TEA(.1) is the TEA in cross direction
TEAML) and TEA(’j) are measured and calculated in accordance with ISO 1924-2 where the measurement shall be made electronically.
5.6 Drop test
5.6.1 Test method
The drop test shall he carried out in accordance with EN 27965-1 using the constant drop height method.
5.6.2 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.
5.6.3 Test procedure
5.6.3.1 Drop test sequence
The drop test shall be carried out on three sacks and shall comprise the following sequence:
1) butt dropping;
2) flat dropping.
5.6.3.2 Butt dropping
The sack shall he dropped from a height of 1,20 m on the bottom of the sack.
5.6.3.3 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.
5.6.4 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’s
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 770 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) the sum of the TEA\VERAGE values of all paper
plies;
e) description of the sacks in accordance
with 4.2.4 of this European Standard;
f) description of the filling material used for
testing;
g) intended nett mass in kg;
h) results of and comments on the drop test;
i) any deviations from the test methods given in
BS EN 770:
j) name and address of the tester;
k) signature of the tester;
l) date of the test.