The suitability of TPR (thermoplastic rubber) plastic pellets for use in the manufacture of rubber bands for vegetable bundling is based on several key properties:
1. Food safety:
The material is formulated without harmful plasticizers such as phthalates, avoiding the migration of chemicals to contaminate food.
2. Excellent mechanical properties:
High elasticity and flexibility: TPR's elongation at break can reach 300%-800%, which can withstand the repeated stretching of vegetable bundling without easy breakage.
Resistant to permanent deformation: It can still maintain its original shape after long time bundling, avoiding the vegetables falling apart due to relaxation (compression permanent deformation rate <40%).
3. Processing advantages:
Low-temperature processability: the melting temperature range is 160-200°C, which saves more than 30% energy compared with the traditional rubber vulcanization process.
High productivity: injection molding cycle can be shortened to 15-30 seconds/mold, suitable for mass production (daily output can reach the level of one million pieces).
4. Environmental adaptability:
Wide range of temperature resistance: -40℃ to 90℃ still maintains the performance, adapting to refrigerated transportation and room temperature shelf environment.
Humidity resistance: water absorption rate <0.5%, stable performance in vegetable cold chain environment (humidity >90%).
5. Economy:
Material density 0.9-1.1g/cm³, 20% lighter than natural rubber, cost per unit length reduced by about 15%.
Edge material can be 100% recycled, comprehensive material utilization rate of more than 98%.
6. Special function design:
Color coding can be achieved by adding food coloring (e.g. red for organic products), and the amount of masterbatch added is only 1%-2%.
Surface micro-texture can be customized (friction coefficient 0.3-0.6) to enhance the anti-slip performance of bundling.
Advantages of tpr material over traditional materials:
Compared with natural rubber: no risk of protein sensitization, 5 times higher ozone aging resistance (outdoor service life extended to more than 2 years).
Compared with latex products: 40% lower energy consumption, and no need for vulcanization process, avoiding the production of nitrosamines and other by-products.
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