GB/T 45336-2025 PDF English
US$380.00 · In stock · Download in 9 secondsGB/T 45336-2025: Plastics - Determination of drawing characteristics of thermoplastics in the molten state Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 45336-2025 | English | 380 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Plastics - Determination of drawing characteristics of thermoplastics in the molten state
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 45336-2025
GB/T 45336-2025: Plastics - Determination of drawing characteristics of thermoplastics in the molten state
---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/GBT45336-2025
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 31
Plastics - Determination of drawing characteristics of
thermoplastics in the molten state
(ISO 16790.2021, MOD)
Issued on: FEBRUARY 28, 2025
Implemented on: SEPTEMBER 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Principle... 8
5 Equipment... 9
6 Calibration... 13
7 Sample and conditioning... 14
8 Test procedure... 14
9 Results representation... 23
10 Precision... 25
11 Test report... 25
Appendix A (Informative) Comparison list of structure numbers between this document
and ISO 16790.2021... 27
References... 30
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document is modified in relation to ISO 16790.2021 Plastics - Determination of
drawing characteristics of thermoplastics in the molten state.
Compared with ISO 16790.2021, this document has many structural adjustments. See
Appendix A for a comparison list of the structural number changes between the two
documents.
The technical differences between this document and ISO 16790.2021 and their reasons
are as follows.
-- ISO 11443 (see 5.1.2, 5.1.3.3, and 6.1) is replaced by the normative reference
GB/T 25278 to adapt to Chinese technical conditions and increase operability;
-- ISO 291 is replaced by the normative reference GB/T 2918 (see Chapter 7) to
adapt to Chinese technical conditions and increase operability;
-- The "Measurement of mean velocity" has been optimized and supplemented to
adapt to Chinese technical conditions and increase operability (see 8.5.1);
-- It is divided into two parts. extruder (8.5.1.1) and capillary rheometer (8.5.1.2)
to make the calculation methods of the two extrusion methods clearer;
-- "Weigh the amount of the specimen extruded from the die within 1 minute as the
mass flow Q, with an accuracy better than ±1 g" is changed to "Weigh the
amount of the specimen extruded from the die within 1 minute as the mass flow
Q, with an accuracy better than ±0.01 g" (see 8.5.1.1) to adapt to Chinese
technical conditions and improve accuracy;
-- The content "ρT shall be calculated according to GB/T 3682.1 or other
appropriate methods" is added (see 8.5.1.1) to provide the calculation method;
-- The calculation formula for the mean velocity of the capillary rheometer is added
(see 8.5.1.2) to provide the calculation method;
-- The normative references to GB/T 3682.1 are added (see 8.5.1.1 and 8.5.1.2) to
adapt to Chinese technical conditions and increase operability;
-- The content "Important note -- Melt strength shall not be reported alone. Test
results shall always be reported together with the actual test conditions" is
deleted from Chapter 11.
The following editorial changes were made to this document.
-- A foreword is added, the content of which corresponds to part of the scope of
ISO 16790.2021;
-- Note 2 and Note 3 of "initial diameter" in the definitions are transferred to Note
1 and Note 2 of 8.4.2.1 (see 8.4.2.1) for application in the test procedure.
Please note that some of the contents of this document may involve patents. The issuing
organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Plastics
of Standardization Administration of China (SAC/TC15).
Drafting organizations of this document. Beijing Sinopec Fuel Gas Co., Ltd., Sinopec
(Beijing) Research Institute of Chemical Industry Co., Ltd., Beijing Esum Technology
Co., Ltd., Zhonglan Chenguang Chengdu Testing Technology Co., Ltd., Xiamen
Harvest Intelligent Manufacturing Co., Ltd., NETZSCH Scientific Instruments Trading
(Shanghai) Co., Ltd., Gotech Testing Machines (Dongguan) Co., Ltd., Zhejiang Shiny
New Materials Co., Ltd., Hubei Xiangyuan New Material Technology Co., Ltd.,
Zhejiang NHU Co., Ltd., Guangdong Zhonghe High-tech Co., Ltd., Zhejiang Yonghe
Refrigerant Co., Ltd., Zhejiang Expo New Materials Co., Ltd., Lanzhou Chemical
Research Center of Petrochina Company Limited, China Petroleum Corporation
Petrochemical Research Institute Co., Ltd., Hebei Shuanglongsheng Optoelectronic
Technology Co., Ltd., Hebei Tianji New Materials Co., Ltd., Kingfa Sci.&Tech. Co.,
Ltd., Ningbo Yongling Avigation Technology Co., Ltd., Jiangsu New Taurus Cable Co.,
Ltd., Guilin International Wire and Cable Group Co., Ltd., Yangzhou Haonianhua
Polymer Materials Co., Ltd., Zhejiang Sanmen Hongqiao Rubber&Plastic Technology
Co., Ltd., Shenzhen Jiexinhua Technology Co., Ltd., Huizhou Yuansu Polymer
Materials Co., Ltd., Changzhou Shunxiang New Material Technology Co., Ltd., Meixin
Manufacturing Co., Ltd., Dongguan Mingkai Plastics Technology Co., Ltd., Ningbo
Micro-foam Technology Co., Ltd.
Main drafters of this document. Yang Lili, Xu Yaohui, Lu Dongmei, Zhang Yanjun,
Zhong Xiangwen, Liu Ping, Wu Tao, Xu Guohong, Wei Qiong, Liang Chuyan, Li
Guangzhen, Hu Yunfeng, Chen Min, Li Yanqin, Du Bin, Sun Tieguo, Sun Huimin, Pang
Chenghuan, Zhang Yaoyue, Lv Mingfu, Chen Yao, Chen Xingzhou, Wu Yongshao, Li
Zhangting, Lan Qiaobo, Wu Congqiao, Li Cheng, Ai Zuguo, Hu Weibo, Lin Dongrong,
Niu Guiming, Bao Jinbiao.
Plastics - Determination of drawing characteristics of
thermoplastics in the molten state
1 Scope
This document describes a method for determining the drawing and fracture properties
of thermoplastics in the molten state by measuring the melt forces developed when the
melt strand is deformed under specified extrusion temperature and traction conditions.
This document applies to thermoplastic molding and extrusion materials that have
sufficient melt strength to be extruded using a capillary rheometer or an extruder
equipped with a die or another extrusion device.
This document also applies to chemically stable thermoplastics that can be formed into
extrudates free of foreign bodies, bubbles, unmelted impurities, etc.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 2918 Plastics - Standard atmospheres for conditioning and testing (GB/T
2918-2018, ISO 291.2008, MOD)
GB/T 3682.1 Plastics - Determination of the melt mass-flow rate (MFR) and melt
volume-flow rate (MVR) of thermoplastics - Part 1.Standard method
GB/T 25278 Plastics - Determination of the fluidity of plastics using capillary and
slit-die rheometers (GB/T 25278-2010, ISO 11443.2005, MOD)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 drawing
The process of drawing a filament of polymer melt when it is continuously extruded by
Record and measure the drawing force Ft and drawing velocity vt in the first stage.
8.5.2.7 Measure the drawing force at different melt drawing velocities by continuously
increasing the pulling velocity. Wait at least 30 seconds at each measuring point to allow
the force value to stabilize.
8.5.2.8 Continue to increase the drawing velocity until the melt breaks. The increase in
the drawing velocity shall ensure that at least 6 values of the drawing force at different
drawing velocities can be measured before the melt breaks.
8.5.2.9 Repeat this process at least twice.
8.5.3 Measurement of melt strength
8.5.3.1 Insert the melt strand between the drive rollers, then close the rollers to tightly
clamp the melt strand, and then stretch the melt at a certain pulling velocity. Set the
pulling velocity of the pulling rollers to be slightly lower than the minimum melt pulling
velocity value obtained in 8.5.2.3.This velocity will vary depending on the material
and temperature. The initial melt pulling velocity should be 0.0125 m/s.
Insert the melt strand between the drive rollers, then close the rollers to tightly clamp
the melt strand, and then stretch the melt at a velocity slightly lower than the minimum
drawing velocity obtained in 8.5.2.3.The initial drawing velocity will vary depending
on the material and temperature. 0.0125 m/s is recommended.
NOTE. Too low a mean velocity and drawing velocity will cause the extrudate to solidify. Therefore, it
is necessary to select appropriate extrusion and drawing velocities to prevent local solidification of the
extrudate (forming a hard skin), which will distort the melt strength results.
8.5.3.2 Start recording the drawing force and drawing velocity.
8.5.3.3 Increase the pulling velocity until the minimum drawing velocity is reached.
8.5.3.4 After the extrudate has stabilized and a baseline signal has been recorded for
these conditions, start accelerating constantly. Record the time at which acceleration is
initiated.
The starting value of acceleration should be 0.0006 m/s2, but this value varies with
material and temperature.
In the case of extrusion using a capillary rheometer, the combination of a high melt
mean velocity Vm and a low melt drawing acceleration a may result in the material in
the barrel being used up before the final value of the melt strength is measured. In
addition, the selection of the melt drawing acceleration shall take into account both the
time interval between melt strand breaks so that appropriate data can be collected and
that no melt solidification occurs during the measurement (see the Note of 8.5.3.1). The
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 45336-2025 be delivered?Answer: The full copy PDF of English version of GB/T 45336-2025 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 45336-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 45336-2025_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 45336-2025 -- 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. How to buy and download a true PDF of English version of GB/T 45336-2025?A step-by-step guide to download PDF of GB/T 45336-2025_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 45336-2025".
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
|