1、BSI Standards PublicationBS EN 16773:2016Aluminium and aluminiumalloys Guideline for theproduction of foil-stock in thefield of semi rigid foodstuffcontainersBS EN 16773:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16773:2016.The UK participation in its
2、preparation was entrusted to TechnicalCommittee NFE/35, Light metals and their alloys.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its
3、 correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 87279 2ICS 77.150.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Str
4、ategy Committee on 31 January 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 16773:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16773 January 2016 ICS 77.150.10 English Version Aluminium and aluminium alloys - Guideline for the production of foil-sto
5、ck in the field of semi rigid foodstuff containers Aluminium et alliages daluminium - Lignes directrices relatives la fabrication de feuilles minces dans le domaine des rcipients alimentaires semi-rigides Aluminium und Aluminiumlegierungen - Leitfaden zur Fertigung von Folienvorwalzbndern fr halbsta
6、rre Lebensmittelbehlter This European Standard was approved by CEN on 21 November 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date list
7、s and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under
8、the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yug
9、oslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPE
10、N DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16773:2016 EBS EN 16773:2016EN 16773:2016 (E) 2 Contents Page E
11、uropean foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Pre-lubrication oils selection criteria for rolled semi-finished products 6 4.1 General 6 4.2 Pre-lubricant selection criteria 7 5 Cleanliness and smell of rolled products 7 5.1 General 7 5.2 Rolled
12、strip smell evaluation 8 5.3 Cleanliness level evaluation 8 5.3.1 General 8 5.3.2 Equipment . 8 5.3.3 Execution of the rub test . 9 5.3.4 Results evaluation . 9 Bibliography . 11 BS EN 16773:2016EN 16773:2016 (E) 3 European foreword This document (EN 16773:2016) has been prepared by Technical Commit
13、tee CEN/TC 132 “Aluminium and aluminium alloys”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2016, and conflicting national standards shall be w
14、ithdrawn at the latest by July 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This standard gives indication on productions pra
15、ctices to obtain rolled products with specific surface quality properties, necessary for the production of disposable food containers. It contains references to smell and cleanliness requirements of the rolled products, evaluation criteria linked to specific tests; furthermore it contains selections
16、 criteria for rolling oil and pre-lubricant to be used in the manufacturing process. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Re
17、public, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS
18、 EN 16773:2016EN 16773:2016 (E) 4 Introduction The European Regulation (EC) 1935/2004, regarding materials and objects intended to come in contact with foodstuff and abrogating Directives 80/590/EEC and 89/109/EEC at point 3, states: “The principle underlying this Regulation is that any material or
19、article intended to come into contact directly or indirectly with food must be sufficiently inert to preclude substances from being transferred to food in quantities large enough to endanger human health or to bring about an unacceptable change in the composition of the food or a deterioration in it
20、s organoleptic properties.” Food containers represent a typical example of products often used in direct contact with food, for which reason they need to be produced in order to avoid particular smells and with an adequate level of “surface cleanliness” (which can otherwise adversely modify food org
21、anoleptic properties). BS EN 16773:2016EN 16773:2016 (E) 5 1 Scope This European Standard provides a guideline about manufacturing practices for rolled products in the thicknesses range between 35 m and 200 m having surface quality characteristics essential for production of aluminium semi-rigid con
22、tainers, lids and disposable platters which are used in contact with foodstuff. This European Standard can be applied to the production cycle of the “rolled semi-finished goods”. The European Standard cannot be applied to the production process of containers, lids and disposable platters. 2 Normativ
23、e references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app
24、lies. EN ISO 6886, Animal and vegetable fats and oils - Determination of oxidative stability (accelerated oxidation test) (ISO 6886) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 tray equivalent of disposable “single-use” containers intende
25、d to be used in contact with foodstuff, produced by aluminium rolled strip having a thickness in the range 35 to 200 m, soft or partially annealed temper Note 1 to entry: The strip is normally supplied pre-lubricated in order to allow drawing or stamping. The tray as finished good can have wrinkle o
26、r smooth walls. 3.2 lid disposable aluminium rolled product used for container closure and based on plain foil or paper coupled (the side in contact with food will be the laminated one) Note 1 to entry: It can close the container with mechanical seaming or by folding an adequate “L shaped” border. 3
27、.3 platter containers produced by aluminium rolled strip with platter shape, always used with disposable features 3.4 typical rolled strip smell low intensity and constant through time smell, presenting small variations depending on various rolled aluminium manufacturers and the subjective olfactory
28、 perception Note 1 to entry: For typical smells comparison reference test we can consider the pre-lubricants smell as it is (with no definite odour), which resists to photo-oxidation processes and to temperature ranges comparable to the conditions existing during transport and storage of containers.
29、 BS EN 16773:2016EN 16773:2016 (E) 6 3.5 pungent rolled strip smell smell clearly different from the typical one, with an intensity that can modify the perception of the food contained Note 1 to entry: Typical examples are acrid, rancid or unpleasant smells (which may arise also after several months
30、 of storage period) or pleasant but intense odours which may modify the original food smell. 3.6 chemical degreasing operation done in order to eliminate eventual unwanted substances on the rolled surface by acid or basic chemical reagents containing surfactants 3.7 lubricant substance introduced to
31、 reduce friction between moving surfaces 3.8 pre-lubricant technological adjuvant or processing aid to the drawing or forming process 3.9 rolling oil oil lubrication-cooler used in the process of cold rolling 4 Pre-lubrication oils selection criteria for rolled semi-finished products 4.1 General Dep
32、ending on the final use of the semi-finished rolled product, the purchaser can ask for the foil to be supplied with a pre-lubrication layer. Such a layer is necessary for drawing or forming processes taking place normally through a malefemale dies with deformation depth depending on the shape of the
33、 tray. Consequently the stress on the material is a combination of the forming force, transmitted from the die to the material and the surface friction between die and metal. Surface friction represents an important limit on the deformation possibilities because the breaking strength of the rolled m
34、aterial is limited and cannot assume higher values than the metal specific ones. Furthermore, the sliding between the die and the metal sheet leads to continuous die and metal sheet wearing. From this basis results the unavoidable necessity to use a pre-lubricant which has the following tasks: to es
35、tablish a balance between friction reduction and the blank holder braking power; to ensure a film between metal sheet and dies in order to avoid grip between aluminium and tool; to minimize punches and matrix wearing; to uniform deformations distribution; to remove heat from the working area; to fac
36、ilitate the detachment of the formed container from the die; to prevent corrosion of the formed part and the die. BS EN 16773:2016EN 16773:2016 (E) 7 4.2 Pre-lubricant selection criteria In the production of food containers and their lids it is allowed to use pre-lubricant oil. NOTE Some national re
37、gulations do not limit the maximum lubricant quantity per surface units but limits only the chemical features of the lubricant itself. Oils and fats used as pre-lubricants, according to good manufacturing practice, should have an oxidation stability equivalent to a minimum of 100 h at a temperature
38、of 100C, determined by the method described in EN ISO 6886. The lubricant selection shall be done among the following categories: 1) Paraffinic hydrocarbons of medicinal level type, either semi-solid (Vaseline) or liquid (Vaseline oil); 2) Synthetic and natural esters, obtained through reaction of n
39、atural acids and polyalcohols or by glycerines modification, or their mixtures. Synthetic esters are defined as esters of natural origin submitted to chemical processes of trans-esterification or re-esterification in order to eliminate unwanted compounds that can bring about negative features to the
40、 food they are in contact with. Basically these processes are essential to eliminate compounds easily oxidizable which may lead to the oil deterioration (going rancid). 3) Hydrocarbons mixtures mentioned at point 1 with esters mentioned at point 2 are allowed. Pre-lubricants used shall not contain p
41、otentially allergenic substances. In any case the producer choosing the pre-lubricant shall verify together with the manufacturer if there are additional limitations related to substances used in the specified product. The quantity of pre-lubricant put on upper and lower surfaces of the rolled strip
42、 can vary according to the difficulty of the tray design; however, the maximum quantity applied should not be higher than 900 mg/m2as sum of the surfaces (maximum quantity used for particularly severe tray design). 5 Cleanliness and smell of rolled products 5.1 General During Cold Rolling process us
43、ually are in use lubricant and cooling fluids, said rolling oils, generally constituted by hydrocarbons mixtures, normal- or iso-paraffin (with aromatic content 0,05 %) with added mixtures of long chain alcohols (normally from C12 to C14) or methyl esters and/or fatty acids mixtures. Such fluids are
44、 generally evaporated from the rolled strip during the heat treatment processes following the rolling. The rolling oil quality management is very important for the production of rolled semi-finished products intended to be used in contact with food, both regarding fluids filtration and pollution of
45、the rolling oil by the other service oils used for lubrication of mechanic components or for hydraulic system normally used in the rolling-mills. Service oils of compatible nature to rolling fluid should be used in order to prevent the risk of surface staining during the annealing process. In order
46、to get higher cleanliness level, a chemical degreasing treatment can be added as final working step of the manufacturing process. Such operation is normally obtained by washing the strip surface with water solutions based on acid or alkaline or surface-active degreasing agents, followed by rinsing i
47、t with demineralized water. This degreasing step, when used, improves the rolled strip surfaces cleanliness by means of the chemical and the hydro-mechanical effect. Normally few second of “Contact time” are sufficient. After BS EN 16773:2016EN 16773:2016 (E) 8 degreasing, the aluminium strip passes
48、 through special squeezing rolls and then is rinsed by demineralized water, usually having a Conductivity 100 S. Finally the strip passes through a hot air drying tunnel. The advantages obtained by adding this chemical degreasing step can be appreciated both in terms of “smell” and “surface cleanlin
49、ess”. Furthermore the oil used for the pre-lubrication of rolled strip shall be selected in order to avoid phenomena of degradation and rancidity through time (see EN ISO 6886). Oil can be applied using a mechanical device by special rollers (“Rotogravure”) or by electro-static field. The continuous filtration of prelubricating oil minimizes solid contaminants. 5.2 Rolled strip smell evaluation Rolled material may have a “pungent smell” different from the “typical smell”. In this situation it could be difficult to give an objective evaluation
