GB/T 17931-2018 PDF EnglishUS$210.00 · In stock · Download in 9 seconds
GB/T 17931-2018: Poly (ethylene terephthalate) (PET) resin for bottles Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 17931: Historical versions
Similar standardsGB/T 17931-2018: Poly (ethylene terephthalate) (PET) resin for bottles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT17931-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.080.20 G 32 Replacing GB/T 17931-2003 Poly (ethylene terephthalate) (PET) resin for bottles Issued on: DECEMBER 28, 2018 Implemented on: NOVEMBER 01, 2019 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Product classification... 6 5 Requirements... 7 6 Test methods... 7 7 Inspection rules... 9 8 Marking and accompanying documents... 11 9 Packaging, transportation and storage... 11 Annex A (informative) Statistical results of the precision test of the intrinsic viscosity of PET resin for bottles... 12 Annex B (normative) Preparation of density gradient columns - Batch method... 13 Annex C (informative) Relationship between PET crystallinity and density... 15 Poly (ethylene terephthalate) (PET) resin for bottles1 ScopeThis Standard specifies the terms and definitions, product classification, requirements, test methods, inspection rules, marking and accompanying documents, packaging, transportation and storage for poly (ethylene terephthalate) (PET) resin for bottles. This Standard applies to homopolymer PET resin that uses purified terephthalic acid and ethylene glycol as the main raw materials, and is produced by direct esterification continuous polycondensation or intermittent polycondensation AND copolymer PET resin that uses purified terephthalic acid, ethylene glycol and isophthalic acid as the main raw materials and adopts direct esterification continuous polycondensation or intermittent polycondensation to produce.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 1033.1-2008, Plastics -- Methods for determining the density of non-cellular plastics -- Part 1.Immersion method, liquid pycnometer method and titration method GB/T 1033.2-2010, Plastics -- Methods for determining the density of non-cellular plastics -- Part 2.Density gradient column method GB 4806.6, National Food Safety Standard -- Plastic resin used in food-contact GB/T 6678-2003, General principles for sampling chemical products GB/T 6679-2003, General rules for sampling solid chemical products GB/T 6682-2008, Water for analytical laboratory use -- Specification and test methods GB/T 8170-2008, Rules of rounding off for numerical values and expression and judgement of limiting values GB/T 9345.2-2008, Plastics -- Determination of ash -- Part 2.Poly (alkylene terephthalate) materials GB/T 14190-2017, Testing methods of fiber grade polyester (PET) chip GB/T 19466.3-2004, Plastics -- Differential scanning calorimetry (DSC) -- Part 3. Determination of temperature and enthalpy of melting and crystallization SH/T 1817-2017, Plastics -- Determination of residual acetaldehyde in polyethylene terephthalate (PET) resin for bottles -- Headspace gas chromatography3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 color b value The degree to which a substance varies from blue to yellow in the CIE standard. 3.2 color L value The brightness of a substance according to the CIE standard. 3.3 impurity Substances other than PET resin. 3.4 powder Debris passing through a test sieve with a mesh size of 800 μm (20 mesh). 3.5 color granule Yellow particles or other colored particles can be seen with the naked eye. 3.6 efficiently endothermic PET resin A PET resin which is polymerized from purified terephthalic acid, ethylene glycol and isophthalic acid as main raw materials and used for injection molding and blowing of bottles by adding additives, and has the function of improving the heat absorption efficiency of the blowing process.4 Product classificationPET resin for bottles can be divided into two categories according to different uses. food packaging and non-food packaging. 6.4 Intrinsic viscosity 6.4.1 Specimen preparation Place about 10 g of sample in liquid nitrogen or dry ice and cool for about 10 min. After taking out the sample, crush it immediately with a crusher. The crushing time shall not exceed 30 s. The sample shall be crushed into particles less than 1 mm. All crushed particles are used as test samples. 6.4.2 Test steps Follow the provisions of 5.1 of GB/T 14190-2017.The solvent is prepared according to 5.1.1.3.2.Method A (capillary viscometer method) is the arbitration method. Among them, the specimen volume is (0.125±0.005) g. The dissolution conditions are. dissolve the specimen completely at (110±10)℃. The dissolution time shall be controlled within 30 min. If this time is exceeded, the sample shall be re-prepared. The temperature of the constant temperature water bath is. (25.00±0.02)℃. 6.4.3 Result calculation According to 5.1.1.7.3 of GB/T 14190-2017.The statistical results of the precision test of the intrinsic viscosity of a PET resin for bottles are shown in Annex A. 6.5 Acetaldehyde content According to SH/T 1817-2017. 6.6 Chroma The drying process is carried out according to the provisions of 5.5 Method B (Drying Method) in GB/T 14190-2017, where the drying condition is (135 ± 5) °C and the drying time is 30 min. 6.7 Diethylene glycol content According to 5.2 Method A (methanol transesterification method) in GB/T 14190-2017. 6.8 Carboxyl terminal content The method is carried out according to the provisions of 5.4 of GB/T 14190-2017. Among them, Method A (volumetric titration) is the arbitration method. The specimen volume requirement of Method A is. weigh (1.5±0.1)g of specimen, accurate to 0.0001 g. 6.9 Melting peak temperature (DSC method) The test is carried out in accordance with GB/T 19466.3-2004.The heating rate is 10℃/min. It is recommended to test without nitrogen. 6.10 Particle appearance 6.10.1 Powder Proceed as per 5.8 Method A (dry method) in GB/T 14190-2017. 6.10.2 Color granule Weigh 500 g of the specimen, accurate to 1 g. Place the specimen in a white enamel dish. Pick out the particles of different colors and record their number. 6.11 Moisture The test is carried out according to the provisions of 5.7 of GB/T 14190-2017.Among them, Method A (gravimetric method) is the arbitration method. 6.12 Density Density can be measured by immersion method and density column method. The immersion method is used in arbitration. The immersion method is carried out in accordance with the provisions of GB/T 1033.1- 2008.The immersion liquid is anhydrous ethanol. The density of the anhydrous ethanol immersion liquid is measured according to the method in 5.1.4.3 of GB/T 1033.1-2008. It can also be measured using a standard glass float (according to the sample density measurement conditions; the mass of the standard glass float in the air and the apparent mass in the immersion liquid are tested respectively; and then the density of the immersion liquid is calculated according to formula (2) in GB/T 1033.1-2008). It is recommended to use a standard glass float with a density value close to that of PET resin. According to the provisions of GB/T 1033.2-2010, the density gradient liquid adopts n- heptane/carbon tetrachloride system. The continuous method for preparing density gradient columns is in accordance with 5.4.2 of GB/T 1033.2-2010.The intermittent method for preparing density gradient columns is in accordance with the provisions of Annex B. For the relationship between crystallinity and density, see Annex C. 6.13 Ash content According to GB/T 9345.2-2008, the sample weight is 20 g. The temperature of the muffle furnace is (850±50)℃.7 Inspection rules7.1 Inspection category8 Marking and accompanying documents8.1 Marking The outer packaging bags of PET resin products for bottles shall have obvious markings. The markings include. trademark, manufacturer name, manufacturer address, standard number, product name, brand, batch number (including production date) and net content, as well as warning signs for product protection and handling. 8.2 Accompanying documents When the products leave the factory, each batch of products shall be accompanied by a product quality inspection certificate. The certificate shall indicate the product name, designation, batch number, implementation standard, and be stamped with a special quality inspection seal.9 Packaging, transportation and storage9.1 Packaging The packaging of PET resin for bottles can be divided into bulk bags, tank trucks, container sea bags and other forms. The packaging bag of bulk bag products is a polyolefin woven bag lined with a polyethylene film inner bag and covered with a polyethylene dustproof film. The tank truck for transporting products shall be clean, dry and free of foreign matter. 9.2 Transportation PET resin for bottles is non-dangerous goods. There are no special requirements for transportation. However, certain protective measures shall be taken during transportation and loading-unloading to prevent the product from getting damp, contaminated, or damaged. The transportation vehicle shall be kept clean and dry, and equipped with a shed or tarpaulin. Sharp tools such as iron hooks shall not be used during transportation and loading-unloading. Mechanical collisions shall be prevented. During transportation, it must not be mixed with sand, broken metal, coal, glass, etc. It must not be mixed with toxic, corrosive or flammable materials. It shall not be exposed to the sun or rain. Loading and unloading operations must comply with warning sign regulations. 9.3 Storage PET resin for bottles shall be stored in a cool, dry, ventilated, clean warehouse equipped with fire-fighting facilities. Take dust prevention measures. When storing, keep away from heat sources and avoid direct sunlight. Do not pile in the open air.Annex B(normative) Preparation of density gradient columns - Batch method B.1 Reagents and materials Unless otherwise stated, only analytically pure reagents are used in the analyses. B.1.1 n-Heptane. analytically pure. B.1.2 Carbon tetrachloride. analytically pure. B.2 Instruments B.2.1 Density gradient tube. See 5.1.1 to 5.1.3 of GB/T 1033.2-2010. B.2.2 Magnetic stirrer. B.2.3 Erlenmeyer flask. capacity is 500 mL. B.2.4 Capillary funnel. inner diameter is about 0.5 mm; length is greater than the height of the density gradient tube. B.2.5 Measuring cylinder. capacity is 100 mL, 200 mL. B.3 Preparation of density gradient column for determination of PET resin density B.3.1 The density gradient column shall be prepared to ensure that the sensitivity of the density gradient column is not less than 0.001 g/cm3 per centimeter of column height. For example. the ideal density range for a gradient tube is 0.001 g/cm3 ~ 0.1 g/cm3.The upper and lower ends of the tube shall not be used. Readings outside the calibration section shall not be taken. B.3.2 Prepare 10 component solutions according to the requirements in Table B.1. When preparing each solution, use a measuring cylinder (B.2.5) to measure carbon tetrachloride and n-heptane respectively. Add them to a conical flask (B.2.3). Stir thoroughly with a magnetic stirrer (B.2.2). NOTE. The density range of the density gradient column is determined by the density value of the product. The volume of each component is allocated according to the total volume of the density gradient tube. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 17931-2018 be delivered?Answer: The full copy PDF of English version of GB/T 17931-2018 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 17931-2018_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 17931-2018_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 17931-2018 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 17931-2018?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 17931-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 17931-2018?A step-by-step guide to download PDF of GB/T 17931-2018_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 17931-2018". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
