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है”ह”ह

IS 6941 (1973): Method for sampling metal closures [MTD 32:Metal Containers]

b

IS : 6941- 1973

Indian Standard METHODS FOR

SAMPLING METAL CLOSURES

Metal Containers Sectional Committee, MCPD 12

Chairman

SHRI L. SIRAND

Members

Representing

Metal Box Co of India Ltd, Calcutta

SHRI A. V. PRADHAN (Alternate to Shri L. Sikand )

SI~RI S. P. BALASUBRAHMANYAM Directorate of Sugar & Vanaspati, Ministry of

SRRI F. G. T. MENEZES ( Alternate) Agriculture, Department of Food

SHRI P. R. BHAGWAT Railway Board, Ministry of Railways SHRI J. N. BHAMB~Y Hindustan Steel Ltd, Rourkela

SRRI P. B. RAO ( Alternate ) SHRI P. H. BHATT Kaira District Co-operative Milk Producers’ Union

Ltd, Anand SRRI T. C. CHANDRAN ( Alternate )

SHRI C. CHANDY Tri-Sure India Pvt Ltd, Bombay SHRI A. S. KAPOOR (Alternate )

SRRI N. M. CHINOY Federation of Associations of Small Industries of India, New Delhi

SHRI M. L. DAY M. L. Day & Company, Calcutta SRRI S. V. DIVEKAR Zenith Tin Works Pvt Ltd, Bombay

SRRI P. D. KATRAK ( Alternate ) SHRI 0. P. DUGGAL Containers & Closures Ltd, Naihati

SHRI P. K. MOULIK ( Alternate ) MAJ N. V. R. IYENGAR Indian Institute of Packaging, Bombay

SHRI K. N. KUDALKAR (Alternate) SHRI G. S. KADBET Poysha Industrial Company Ltd, Thana

SHRI S. CHATTERJEE ( Alternate ) SHRI KIRPAJ, SINGH Tin Plate Co of India Pvt Ltd, Tatanagar SHRI A. R. A. KRISHNAN Ministry of Defence ( DGI )

MAJ B. K. SINGR (Alternate) SRRI H. V. KUVAVALA Indian Paint Association, Calcutta

SHRI A. C. BHATTACHARYA ( Alternate )

SHRI S. LAKSHMIKANTHAN Export Inspection Council, Ministry of Foreign Trade

SHRI P. K. DAS (Alternate )

( Continued on page 2 )

@ Copyright 1973 INDIAN STANDARDS INSTITUTION

This publication is protected under the Indian Copvright Act (XIV of 1957) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

IS : 6941.1973

( Continued from page 1 )

Members Representing

SRRI V. B. MAINKAR Directorate of Weights & Measures, New Delhi SHRI A. N. MUKHERJEE Directorate General of Technical Development,

New Delhi SHRI M. P. MUKHERJI Chief Inspectorate of Explosives, Nagpur DR S. M. PATEL Vanaspati Manufacturer’s Association of India,

Bombay SHRI I. J. PURI All India Food Preservers’ Association, New Delhi

SHRI Y. K. KAPOOR ( Alternate ) DR V. S. RAUT Organization of Pharmaceutical Producers of India,

Bombay SRRI N. P. SATPUTE Directorate of Industries, Government of

Maharashtra SENIOR MARRETINQ OFFICER Directorate of Marketing & Inspection, Faridabad SHRI G. S. SRIVASTAVA Esso Eastern Inc, Bombay

SHRI K. SUNDARAM ( Alternate ) SHRI P, VEERRAJU Central Food Technological Research Institute

( CSIR ), Mysore SHRI G. VERGHIS I. C. I. (India) Pvt Ltd, Calcutta

SHRI B. KUMAR ( Alternate ) SHRI A. R. YAJNIK

SHRI V. P. VERMA ( Alternate ) Indian Oil Corporation Ltd, Bombay

SHRI K. S. SUBRAMANIAM, Director General, IS1 ( Ex-qj’icio Member ) Officer on Special Duty ( MCPD )

Secretary

SRRI T. PURNANANDAM

Deputy Director ( MCPD ), IS1

Sampling Subcommittee, MCPD 12 : 4

Corivener

SHRI S. KAPUR

Members

SRRI P. H. BRATT

Metal Box Co of India Ltd, Calcutta

Kaira District Cooperative Milk Producers’ Union Ltd, Anand

SHRI T. C. CRANDRAN ( Alternate ) SHRI S. D. CRAKRAVARTY Bharat Barrel & Drum Mfg Company Pvt Ltd,

Bombay SHRI S. S. HI:SAIN ( Alternate)

SHRI C. &ANDY Tri-Sure India Pvt Ltd, Bombay SHRI A. S. KAPOOR ( Alternate )

SFIRIO. P. DU~GAL ’ ’ Containers & Closures Ltd, Naihati SHRI P. K. MOULIK (Alternate)

SHRI H. C. KINRA Burma Shell Oil Storage

SHRI C. S. R. ULLAL (Alternate) Ltd, Bombay

& Distributing Co of India

SHRI K. U. PATEL All India Food Preservers’ Association, Calcutta MAJ B. K. SINGH Ministry of Defence (DGI )

SRRI M. L. DHUPAR ( Alternate) SRRI H. K. UPADHYAYA Larsen & Toubro Limited, Bombay

2

IS : 6941- 1973

Indian Standard METHODS FOR

SAMPLING METAL CLOSURES

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 4 May 1973, after the draft finalized by the Metal Containers Sectional Committee had been approved by the Marine, Cargo Movement and Packaging Division Council.

0.2 Evaluation of quality of a lot with a view to determining the accept- ability (or otherwise) is an important aspect in any deal or transaction to metal closures. The two alternatives for this purpose are cent percent inspection and sampling inspection. The former is an uneconomical method due to the bigger size of the lot of metal closures. On the other hand, the merit of sampling consists in the fact that the inspection of a sample of relatively smaller size taken from a lot will make valid inferences about the lots with considerable economy and accuracy.

0.3 This standard prescribes the sampling details for a number of characteristics and tests, which should adequately cover the checking schedules of most of the consumers. The acceptable quality levels for the various characteristics and tests have been based on the actual data collected from leading manufacturers in the country. For air pressure/ other tests, double sampling procedure has been recommended so as to reduce the average amount of inspection in the long run.

0.4 Since all type of metal closures require inspection for the same characteristics and tests, this standard covers method of sampling of closures in general, with same scale of sampling for various types of closures.

0.5 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with the IS: Z-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard prescribes the methods for sampling and the criteria for ascertaining the conformity of metal closures.

*Rules for rounding off numerical values ( revised).

3

SS : 6941-1973

2. TERMINOLOGY

2.0 For the purpose of this standard, the following definitions shall apply.

2.1 Item - The metal closures on which inspedtion and testing will be performed.

2.2 Lot -A collection of the items of the same type and size manu- factured under relatively the same conditions of production.

NOTE- Whereas it is not possible to give exact instruction for the formulation of lot that will cover all cases, one or more of the following considerations may be help- ful in determining the similarity of conditions of production:

a) Items from a single batch of raw materials or from component parts obtained from a single source,

b) Items manufactured by a single production method,

c) Items from a single production line,

d) Items manufactured during a single production shift, and

e) Items produced from one setting of the machines

2.3 Sample - A collection of items selected for inspection from a lot to reach the decision regarding the acceptance or rejection of the lot.

2.4 Defect-Failure to meet the requirement imposed on an item with respect to a single characteristic.

2.5 Defective - An item having one or more defects.

2.6 Percent Defective - 100 times the ratio of the number of defectives to the total number of items.

2.7 Acceptabie Quality Level ( AQL) -The maximum percent defective, that for the purpose of sampling of metal closures may be considered as a satisfactory process average.

NOTE - When the purchaser designates some specific values of AQI. he indicated to the supplier that his (purchaser’s ) acceptance sampling plan will accept the great majority of the lots submitted by the manufacturer provided his process average level of percent defective in these lots is not greater than the designated value of AQL. Thus AQL is the designated value of percent defective indicated by the purchaser which will be accepted most of the times ( approximately 89 to 99 percent ).

2.8 Process Average -The average percent defective of the items submitted by the producer for original inspection (original inspection is the first inspection for particular quantity of item as distinguished from the inspection of items which have been resubmitted after prior rejections ).

NOTE- It is recommended that the process average be estimated from the results for not less than 10 lots. Its value shall be calculated by taking 100 times the ratio of the total number of defectives in the sample and the total number of items in the sample drawn from these lots.

4

,

IS : 6941-1973

2.9 Acceptance Number (a) - Maximum allowable number of defectives in the sample for acceptance of the lot.

2.10 Rejection Number (1:) -The minimum number of defectives in the sample for the rejection of the lot.

2.11 Supplier-The party supplying the items. The supplier may or may not be the actual manufacturer of the item.

2.12 Purchaser -The party purchasing the items. The term ‘ purchaser’ will also cover the person or persons expressly authorized in writing by the purchaser to act on his behalf for inspection of the item.

3. PROCESS INSPECTION

3.1 The object of inspection of metal closures by the purchasers is to ensure their conformity to the specification requirements whereas inspection done by the manufacturer during production is to ensure uniformity and reduce quality fluctuations to the minimum. For process control, the manufacturer shall take representative sample of the product at regular intervals at various stages of production to control the quality fluctuations. For items of the same lot, the inspection levels given in Table 1 are ‘recommended for routine control over the manufacturing process.

3.2 The basic raw materials used in the manufacture of the various components of the closures shall conform to the requirements laid down in the relevant Indian Standard, as evidenced by necessary test certificates accompanying each consignment of the raw material. Necessary random checks may also be performed by the manufacturer for ensuring the quality of the raw material.

TABLE 1 INSPECTION LEVELS

(Clause 3.1 )

SL CH~RACTERISTICS/TESTS FREQUENCY OF INSPECTION/TESTS NO.

(1) (2)’ (3)

i) Visual ( workmanship and finish ) 50 closures for each hours production ii) Dimensions (diameter, height, etc) 5 after the setting of machines (see Note)

and thereafter 2 for each hourly pro: duction (may be checked by ‘go’ ‘ no-go ’ gauges )

iii) Air pressure test One for every half an hour. In case of any defect, 10 successive closures may be tested and found satisfactory before rever- ting to the original frequency

iv) Any other test (to be specified) One per position for every half an hour’s production

NOTE -In case of multiple tools, samples from each individual position may be checked.

5

IS : 6941- 1973

3.3 For effective process control, the use of statistical quality control techniques are recommended. Helpful guidance may be obtained from IS : 397-1952*.

3.3.1 The inspection data or the results of tests done at the place of manufacture may be made available along with the item supplied to enable the purchaser to judge the acceptability of the lot.

3.4 When it is not possible to make such information available to the purchaser or when the purchaser so desires, the procedure laid down in 4 shall be followed for iudning the conformitv of the lot of metal closures

Y “V I to the requirements of the relevant material specifications.

4. LOT INSPECTION

4.1 Scale of Sampling

4.1.1 Sample closures shall be selected and examined separately each lot for ascertaining their conformity to the requirements of relevant specification.

for

4.1.2 The number of closures to be selected from a lot shall depend upon the size of the lot and shall be in accordance with co1 1 and 2 of Table 2.

4.2 Methods for Selecting Metal Closures-The closures to be selected from the lot shall be chosen at random. In order to ensure the randomness of selection, a suitable number of boxes (not less than 10 percent) of the total number in the lot subject to a minimum of 2 shall first be chosen at random. From each of the boxes so chosen, an approxi- mately equal number of closures shall be picked up from its different parts or layers to obtain the required number of closures.

TABLE 2 SCALE OF SAMPLING AND PERMISSIBLE NUMBER OF DEFECTIVES FOR VISUAL AND DIMENSIONAL CHARACTERISTICS

(Clauses4.1.2,4.3.1 andjVoteof4.3.2)

SAMPLE SIZE ACCEPTABLENUMBER NO.OF~TEMSINTRE LOT

(1)

up to 1 a00

1001 ,, 3 000

3001 )) 10 000

10001 ,, 35 000

35001 )) 150000

1 50 001 and above

(2) (3) 13 1

20 2

32 3 50 5

80 7

125 10

- *Method for statistical quality control during production by the use of control chart

( tentatizte ) .

6

IS : 6941- 1973

4.3 Criteria for Conformity

4.3.1 Visual Characteristics and Dimensions-All the closures drawn according to Table 2 shall be first examined for visual characteristics like workmanship and finish and also for various dimensional requirements. Any closure failing in one or more of these characteristics shall be considered as defective. If the number of defective closures is less than or equal to the corresponding acceptance number given in co1 3 of Table 2, the lot shall be declared as conforming to the requirements of visual characteristics and dimensions; otherwise not.

4.3.2 Air Pressure/Other Tests -The lot which has been found satis- factory according to 4.3.1 shall be further inspected for air pressure/other tests. The number of closures needed for these tests shall be chosen in accordance with co1 1 and 3 of Table 3.

NOTE - For the sake of convenience the number of closures necessary for these tests mav also be chosen from those selected for visual examination and dimensional checking in Table 2.

4.3.2.1 All the closures chosen in accordance with Table 3 shall be subjected to air pressure/other tests. Any closure failing in one or more of these tests shall be considered as defective. If the first sample does not contain any defective closure, the lot shall be declared as conforming to the requirements of air pressure/other tests. If the number of defectives is greater than or equal to 2, the lot shall be deemed as not meeting the requirements of these tests. If, however, one defect is found in the sample, a second sample of the size equal to that of the first shall be taken to determine the conformity or otherwise of the lot. If the second sample is found free of defectives the lot shall be declared as conforming to the requirements of air pressure/other tests, otherwise not.

TABLE 3 SCALE OF SAMPLING AND PERMISSIBLE NUMBER OF DEFECTIVES FOR AIR PRESSURE/OTHER TESTS

(Clauses 4.3.2 and 4.3.2.1 )

No.cw ITEMS SAMPLE SAMPLE CUMUL_~TIVE ACCEPTANCE REJECTION IN THE LOT SIZE SAMPLE SIZE NUMBER NUMBER

(2) (3)

up to 10 000 1st 5

2nd 5

10 001 and above Jlst (2nd 8”

0 1 f

7

INDIAN STANDARDS

ON

METAL CONTAINERS

IS:

916-1966 18-litre square tins (revised )

1394-1966 Glossary of terms relating to metal containers trade (revised)

1406-1971 Rectangular ti,ns for liquids (second revision)

1407-1968 Round tins (Jirst revision )

1413-1970 Round VANASPATZ tins (first revision )

1783-1961 Drums, large, fixed ends

1784-1961 Screwed closures for drums

1994-1961 Crown corks

2034-1961 Butter tins

2087-1971 Square tins for general purposes ( second revision )

2123-1962 Vial ( coldie) seals

2134-1972 Round tin for general purposes (first revision)

2471-1963 Methods of test for metal containers

2474-1968 Closures for drums

2552-1970 Steel drums ( galvanized and ungalvanized ) (first rezlisiw)

3101-1965 Collapsible tubes

3259-1966 Methods for sampling of metal containers

3286-1965 Round grease tins

3575-1965 Bitumen drums

3680-1966 Round printing ink containers

4638-1967 Seamless rectangular fish tins

5241-1969 Shoe polish containers

5682-1970 Open top drums and kegs