Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS (2000): Plastics - Methods of Testing, Part 2: Sampling and Preparation of Test Specimens, Section 9: Injection Moulding of Test Specimens of Thermoplastic Materials - Small Tensile Bars [PCD 12: Plastics]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

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4 IS ( Part 2/Set 9 ) : 2000 IS : 1996 Indian Standard P~LASTICS - MET-HODS OF TESTING PART 2 SAMPLlNG AND PREPARATlON OFTEST SPECIMENS Section 9 Injection Moulding of Test Specimens of Thermoplastic Materials - Small Tensile Bars ICS BIS 2000 BUREAU OF INDIAN STA-NDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI July 2000 Price Group 2

5 Methods of Test for Plastics Sectional Committee, PCD 23 NATIONAL FOREWORD This Indian Standard which is identical with IS : 1996 Plastics - Determination of Injection moulding of test specimens of thermoplastic materials - Part 2 : Small tensile bars issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of Methods of Test for Plastics Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council. The text of IS0 standard has been approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention IS particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (, ) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (. ) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated. However, that International standard cross-referred in this adopted IS0 standard which has subsequently been revised, position in respect of latest IS0 standard has been given: International Standard Corresponding Indian Standard Degree of Equivalence IS0 294-l : 1996 Plastics - IS (Part 2ISec 3) : 2060 Plastics Injection moulding of test - Methods of testing : Part 2 Sampling specimens of thermoplastic and preparation of test specimens, materials - Part 1 : General Section 3 Injection moulded test principles, and moulding of specimens of thermoplastic materials - multipurpose and bar test General principles and moulding of specimens multi-purpose and bar test specimens Identical IS : 1990 Plastics - Determination of tensile-impact strength IS : 1999 Plastics - Acquisition and presentation of comparable multipoint data - Part 3 : Environmental influence on properties Nil Nil - - tn the case of IS and IS , the Technical Committee responsible for the preparation of this standard has reviewed its contents and has decided that they are acceptable for use in conjunction with this standard. In reporting the results of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 Rules for rounding off numerical values ( revised).

6 IS ( Part P/Set 9 ) : 2000 IS : 1996 Indian Standard PLASTICS - METHODS OF TESTING PART 2 SAMPLlNG AND PREPARATION OFTEST SPECIMENS Section 9 Injection Moulding of Test Specimens of Thermoplastic Materials - Small Tensile Bars 1 Scope This part of IS0 294 specifies a four-cavity mould, the type C IS0 mould, for the injection moulding of small tensile bars measunng 3 60 mm x 10 mm x 3 mm (the type 4 test specimen in IS0 8256:1990). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS At the time of publication, the editions indicated were valid. All standards are subject to revision, and partres to agreements based on this part of IS0 294 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 294-l :I 996, Plastics - Injection moulding of test specimens of thermoplastic materials - Part I: General pnnciples, and moulding of multipurpose and bar test specimens. IS0 8256:1990, Plastics - Determination of tensile-impact strength. IS :-l), Plastics - Acquisition and presentation of comparable multipoint data - Part 3: Environmental influences on properties. 3 Definitions See IS0 294-l :I 996, clause 3. 1) To be published.

7 IS ( Part P/Set 9 ) : 2000 IS : Apparatus 4.1 Type C IS0 mould The type C IS0 mould is a four-cavity mould with a double-t runner (see figure 1) intended for the preparation of small tensile bars to be used for the measurement of so-called indicative properties when studying the effects of environmental influences, such as liquid chemicals, heat or weathering, on plastics (see IS ). The bar mouldings produced using this mould shall have the dimensions of the type 4 specimen defined in IS0 8256:1990 plus a thickness of 3.0 mm + 0,2 mm. Dimensions in millimetres X-Y G I SP Sprue Moulding volume VM = mm3 G Gate Projected area AP = mm* Figure 1 - Cavity plate for a type C IS0 mould The main constructional details of the type C IS0 mould shall be as shown in figure 1 and shall meet the requirements given in IS0 294-l :1996, subclause , items a) to n), with the following exception: g) The dimensions of the test specimens refer to IS0 8256, i.e. the main dimensions, in millimetres, of the cavities shall be as follows: - width of central section: 3,0 to 3,l; - radius of curvature: 15 to 16. The thickness of the test specimens shall be 3.0 mm f 0,2 mm, i.e. the depth of the cavities shall be 3,0 mm to 3.2 mm. 4.2 Injection-moulding machine See IS,0 294-l :1996, subclause 4.2, with the following exception: In subclause 4.2.4, the recommended rnenimum locking force FM for the type C IS0 mould is given by F,,,, a x /I,-,.,~~ x 10-3, i.e. 440 kn for a maximum melt; ressure of 80 MPa. 2

8 IS 13360~( Part P/Set 9 ) : 2000 IS : Procedure 5.1 Conditioning of material See IS0 294-l :I 996, subclause Injection moulding See IS0 294-l :I 996, subclause 5.2, but with the following new text for subclause For the type C IS0 mould, it is recommended that the injection velocity VI be chosen such that the injection time t, is comparable to that used for the type A IS0 mould. NOTES 1 The cavities rn the type C IS0 mould have a low critical cross-sectional area AC of only 9 mm2, i.e. much lower than that for the type A IS0 mould (40 mm*). If the same injection speed vi were used for the type C mould as for the type A mould, this would result in a low screw advance speed and hence a low melt speed in the runners and a low melt temperature before the melt enters the cavities of the type C mould. Using the recommended common injection time fi, however, the injection velocity v, for the type C mould is about twice that recommended for the type A mould Isee IS0 294-l :I 996, equation ( This part of IS0 294 does not address the question of changes in screw advance speed, e.g. high speeds when filling the runners and low speeds when filling the cavities. As a result of the inertia of the injection-moulding machine, peaks in melt pressure and/or injection speed often cannot be avoided if the screw advance speed is changed during injection. 6 Report on test-specimen preparation The report shall include the following information: a) a reference to this part of IS0 294; b) to h): see IS :1996, clause 6, items b) to h). 3

9 Bureau of Indian Standards BIS is a statutory institution established under the Bureau oflndian StandardsAct, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude, the free use, in the course of implementing the standard, of necessary details, such as.symbols and sizes, type or grade des ignations. Enquiries relating to copyright be addressed to the Director (Publications), BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed ) periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession ofthe latest amendments or edition by referring to the latest issue of BIS Handbook and Standards : Monthly Additions. This Indian Standard has been developed from Dot : NO. PCD 23 ( 1665 ). Amendments Issued Since Publication Amend No. Date of Issue Text Affected Headquarters: BUREAU OF INDIAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi Telephones : , , Regional Offices: Telegrams: Manaksanstha ( Common to all offices ) Telephone Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI Eastern : l/14 C. I. T. Scheme VII M, V. I. P. Road, Maniktola , CALCUTTA , Northern : SC , Sector 34-A, CHANDIGARH Southern : C. I. T. Campus, IV Cross Road, CHENNAI , , Western : Manakalaya, E9 MIDC, Marol, Andheri (East) MUMBAI I , , Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR. PATNA. PUNE. THIRUVANANTHAPURAM. Pnnted at New India Printing Press, Khur~a; India