1、BRITISH STANDARD BS 7804-2: 1999 ISO 9884-2: 1999 Tea sacks Part 2: Performance specification for sacks for palletized and containerized transport of tea ICS 55.080BS7804-2:1999 This British Standard, having been prepared under the directionof the Consumer Products and Services Sector Board, was pub
2、lished under theauthority of the Standards Committee and comes intoeffecton 15June1999 BSI 03-2000 ISBN 0 580 32478 8 National foreword This British Standard reproduces verbatim ISO 9884-2:1999 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Te
3、chnical Committee AW/8, Tea, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European
4、 developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards
5、 Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for t
6、heir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pages ii to iv, pages 1 to 8 and a back cover. This standard has b
7、een updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS7804-2:1999 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword iii Te
8、xt of ISO 9884-2 1ii blankBS7804-2:1999 ii BSI 03-2000 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Requirements 1 5 Test report 1 Annex A (normative) Transport trials 3 Annex B (normative) Measurement of permeability of tea sack barrier ply material
9、 Determination of chlorophenols and chloroanisoles by gas chromatography 3 Annex C (informative) Guidance on the filling of tea sacks 8 Figure B.1 Diagram of the permeability test cell 6 Figure B.2 Schematic diagram of the thermodesorption cold trap injector 7BS7804-2:1999 BSI 03-2000 iii Foreword I
10、SO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical c
11、ommittee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electr
12、otechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO9884-2was prepared by
13、 Technical Committee ISO/TC 34, Agricultural food products, Subcommittee SC 8, Tea. ISO 9884 consists of the following parts, under the general title Tea sacks Specification: Part 1: Reference sack for palletized and containerized transport of tea; Part 2: Performance specification for sacks for pal
14、letized and containerized transport of tea. Annex A and Annex B form an integral part of this part of ISO 9884. Annex C is for information only.iv blankBS7804-2:1999 BSI 03-2000 1 Introduction ISO9884-1specifies the materials, construction and dimensions of a reference sack which has been demonstrat
15、ed by rigorous transport and storage trials to be suitable for the palletized and containerized transport of tea. Continuing development of improved materials is resulting in the availability of sacks of different materials and construction to serve this purpose. This part of ISO9884sets minimum req
16、uirements and performance tests to ensure that such sacks are equivalent or superior in performance to the reference sack. Guidance on the filling of tea sacks is given in Annex C, for information only. 1 Scope This part of ISO9884specifies requirements and tests to determine the suitability of sack
17、s for the palletized and containerized transport of tea on standard pallets of standard unit load size in standard containers (see ISO 9884-1). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standar
18、d. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and
19、 ISO maintain registers of currently valid International Standards. ISO 1573:1980, Tea Determination of loss in mass at103 C. ISO 2758:, Paper Determination of bursting strength 1) . ISO 4120:1983, Sensory analysis Methodology Triangular test. ISO 4121:1987, Sensory analysis Methodology Evaluation o
20、f food products by methods using scales. ISO 6590-1:1983, Packaging Sacks Vocabulary and types Part 1: Paper sacks. ISO 7965-1:1984, Packaging Sacks Drop test Part 1: Paper sacks. ISO 9884-1:1994, Tea sacks Specification Part 1: Reference sack for palletized and containerized transport of tea. 3 Def
21、initions For the purposes of this part of ISO 9884, the definitions given in ISO 6590-1 apply. 4 Requirements 4.1 Sack type Sacks shall be constructed with flat hexagonal ends and shall consist of at least two plies. 4.2 Dimensions The filled sack dimensions shall be as given in Table1of ISO 9884-1:
22、1994. 4.3 Construction materials 4.3.1 General All materials used in the construction of the sack (paper, plastics, adhesive, barrier ply) shall be free from taint and/or odour. No materials containing chlorophenols or their derivatives shall be used. 4.3.2 Outer ply The outer-ply material shall hav
23、e a minimum wet burst index of1,2kN/g, when tested in accordance with ISO 2758. 4.3.3 Innermost ply The inner ply shall be an aluminium-foil-coated barrier ply with the aluminium facing inwards, complying with ISO 9884-1, or of a material having a permeability to chlorophenol or chloroanisole not gr
24、eater than that of the inner ply of a sack complying with ISO 9884-1, when tested by the method given in Annex B. 4.4 Performance requirements 4.4.1 Drop test When a minimum of three sacks filled with60kg of tea are dropped three times (once each on a face, butt and side) from a constant height of3m
25、, in accordance with the method given in ISO 7965-1, there shall be no rupture of sacks resulting in loss of contents. 4.4.2 Transport trials Sacks shall match or surpass the performance of reference sacks (see ISO 9884-1) throughout a minimum of6months of intercontinental transport trials carried o
26、ut in accordance with Annex A. 5 Test report The test report may be used by a sack manufacturer to certify that a sack conforms to the requirements of this specification. It shall specify the following details. a) Sack specification: 1) materials; 2) construction (number and type of plies); 3) dimen
27、sions. 1) To be published. (Revision of ISO 2758:1983)BS7804-2:1999 2 BSI 03-2000 b) Drop test results: 1) number of sacks tested and date(s) of the test; 2) mass and type of tea; 3) name of organization performing the test. c) Transport trials: 1) place and date of production, grades and invoice/bu
28、lk numbers of the tea; 2) moisture content of the tea at point of packing; 3) number and mass of the reference sacks and the trial sacks packed for each bulk/invoice; 4) place and date of packing/palletization; 5) date and means/route of transport to port of loading; 6) port and date of departure; 7
29、) vessel and details of stowage of the test and reference pallets, other cargo carried; 8) route of the voyage and the date of arrival in the terminal port; 9) means of transport to, and place and date of opening the containers; 10) condition on receipt (see A.2.4); 11) numbers of sample sacks and m
30、ass of samples taken; 12) moisture contents of the samples and the name of the organization carrying out the analysis; 13) names and affiliations of the tea tasters carrying out the organoleptic assessments, the dates of the assessments and the results.BS7804-2:1999 BSI 03-2000 3 Annex A (normative)
31、 Transport trials A.1 General procedure Trial sacks shall be compared with reference sacks (see ISO 9884-1) filled with the same bulk or invoice of tea at the same time under identical conditions, transported together and opened at the same time under identical conditions. At least1000 filled test s
32、acks shall be shipped in a minimum of four vessels over a minimum period of6months in a minimum of two containers per vessel. Each test container shall hold at least100trial sacks and100reference sacks. The test and reference sacks shall be compared on the basis of: incidence and extent of sack dama
33、ge; incidence and extent of product spillage/loss; moisture content of tea on arrival; organoleptic quality of tea on arrival. A.2 Specific procedures A.2.1 Tea from the same bulk or invoice shall be used to fill equal numbers of trial and reference sacks. NOTESeveral bulks may be used to make up pa
34、ired pallet loads of trial and reference sacks to fill the test containers. A.2.2 A minimum of three samples of each bulk of tea shall be taken during the sack-filling operation. The moisture content of each sample shall be determined in accordance with the method given in ISO 1573. A.2.3 Paired pal
35、lets of trial sacks and reference sacks shall be placed adjacently in the test container, alternating in position to achieve an even distribution from side to side and top to bottom. EXAMPLE T R T T R R T R R T where T is a trial sack and R is a reference sack. A.2.4 On arrival at the destination, t
36、he condition of the contents of each test container shall be examined as they are removed and stored in the warehouse. An inspection record shall be completed (with photographs illustrating damage) setting out: dates of arrival and unpacking; the condition, appearance and stability of each pallet lo
37、ad (test and reference sacks); the damage incurred by both test and reference sacks; the extent of any product spillage/loss. A.2.5 Samples shall be taken on arrival from undamaged trial sacks and reference sacks at the top, middle and bottom of each pallet, and these samples shall be bulked. The mo
38、isture contents of the bulked samples shall be determined in accordance with the method given in ISO 1573. The moisture contents of samples from trial pallets shall not exceed those of samples from the paired reference pallets. A.2.6 At least two consignments of tea, having successfully completed a
39、transport trial from producing factory to purchasers warehouse, shall be subjected to a comparative taste assessment. This shall be carried out by a minimum of four professional tea tasters (at least two of whom shall be independent of the producer and the purchaser) on bulked samples from reference
40、 and test pallets containing the same original bulk tea. The first step in this assessment shall be a difference test carried out according to the method given in ISO 4120. If no significant difference (P less than 0,05) is found, the trial sack shall be deemed to have passed the test. If a signific
41、ant difference is found, a preference test shall be carried out in accordance with the method given in ISO4121to determine which sample(s) is (are) of the higher quality. The trial sack shall be deemed to have passed the test if the contents of the reference sacks are not significantly preferred ove
42、r the contents of the trial sacks (P less than 0,05). Annex B (normative) Measurement of permeability of tea sack barrier ply material Determination of chlorophenols and chloroanisoles by gas chromatography B.1 General Multi-wall paper sacks used for the bulk transport of tea include an inner alumin
43、ium-coated barrier ply to protect the contents from contamination arising from the permeation of organic vapours such as chlorophenols and chloroanisoles. The method described in this annex is applicable to tea sack barrier ply materials (e.g. multilayer laminates) to establish rates of chlorophenol
44、 and chloroanisole permeation through a material under test. This procedure may also be considered applicable to determine rates of permeation of other organic vapours through similar barrier materials.BS7804-2:1999 4 BSI 03-2000 B.2 Principle A gas-tight cell is divided into two chambers by the tes
45、t ply material. On one side (i.e. the outer surface of the test material) is generated a saturated vapour of chlorophenol/chloroanisole. The other side (i.e.inner surface of the test material) is purged with an inert gas (e.g. oxygen-free nitrogen) at a known constant rate. Organic vapours permeatin
46、g across the barrier are collected at the purged outlet of the cell onto an absorbent trap. After the elapsed sampling period the trap is removed from the cell for chromatographic analysis of the collected sample. B.3 Reagents and materials Use only reagents of recognized analytical grade. B.3.1 Sta
47、ndard stock solutions B.3.1.1 2,6-Dichlorophenol Dissolve100mg of 2,6-dichlorophenol in methanol and dilute to volume with methanol in a100ml volumetric flask. B.3.1.2 2,4,6-Trichlorophenol Dissolve100mg of 2,4,6-trichlorophenol in methanol and dilute to volume with methanol in a100ml volumetric fla
48、sk. B.3.1.3 Pentachloroanisole Dissolve100mg of pentachloroanisole in methanol and dilute to volume with methanol in a100ml volumetric flask. B.3.2 Standard working solutions Prepare concentrations of100ng/4l, 10 ng/4l, and1ng/4l, by serial dilution from the standard stock solutions (B.3.1). B.3.3 T
49、enax TA beads 2) , mesh size204m to354m. Tenax is a porous polymer based on 2,6-diphenyl-p-phenylene oxide. B.4 Apparatus Usual laboratory equipment and, in particular, the following. B.4.1 Barrier material permeability test cell, seeFigure B.1. The cell is constructed from two borosilica glass domes with flat flange and sockets (ground glass, size DA4/100, socket size 29/32), with an external diameter of150mm. A disc of the test material is cut to size, and placed between the two flanges, which are secure
