T/TJWL 005-2021 Cold chain uses thermoplastic polyurethane (TPU) ice board

Scope

Main Technical Content: 5 Technical Requirements 5.1 Raw Materials 5.1.1 Cooling Agents The cooling agents shall comply with the requirements of T/TJWL 004-2018. 5.1.2 TPU Substrate 5.1.2.1 Dimensional Tolerance 5.1.2.1.1 The length and width of the TPU substrate shall not be less than 99.5% of the nominal value. 5.1.2.1.2 The thickness tolerance shall be within ±0.02 mm. 5.1.2.2 Joints and Segment Length per Roll The number of joints and segment length shall comply with Table 1. Table 1: Joints and Segment Length Roll Length (m) Number of Joints Segment Length (m) 100 ≥1 ≥30 50 ≥1 ≥20 5.1.2.3 Appearance 5.1.2.3.1 There shall be no obvious color difference. 5.1.2.3.2 There shall be no more than 5 bubbles or impurities per square meter, and the diameter of the bubbles or impurities shall not exceed 3 mm. 5.1.2.3.3 There shall be no cracks, delamination, scratches, burn marks, or punctures. 5.1.2.3.4 There shall be no oil stains or dirt stains. Slight wrinkles are allowed, but the total length of wrinkles per 30-m roll shall not exceed 0.5 m. Note: Wrinkles, oil stains, and dirt stains are calculated based on the cumulative length on both sides. 5.1.2.4 Physical and Chemical Properties The physical and chemical properties of the TPU substrate are shown in Table 2. Table 2: Physical and Chemical Properties of TPU Substrate Serial Number Item Standard 1 Puncture Resistance (from outside to inside)/N ≥35 2 Tensile Strength (longitudinal)/N ≥220 50 mm 3 Tensile Strength (transverse)/N ≥220 4 Artificial Accelerated Xenon Arc Lamp Aging (aging time: 500h, Method A, Cycle 2) No bubbling, no cracks, no adhesion, and no holes Retention rate of tensile strength/% ≥65 Longitudinal ≥65 Transverse 5 Low-temperature Bending (-40°C) Can be bent without delamination or cracks 5.2 Appearance 5.2.1 The outer surface of the TPU ice plate for cold chain use shall be clean and tidy, without d

Development Information

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