What companies are developing a square seamless packet column independently in China?

As is widely known to us that China is a manufacturing power. As our country develops, there arises a large number of manufacturing enterprises of square seamless packet columns, and some of them are on the top-ranked list by their modern technologies especially R&D capability while others lack their technology, and are still struggling in this competitive society. For those companies who stand out in the industry, what they have in common is that they invest heavily in technological innovation and keep enhancing their R&D strength. You may search those suppliers on Alibaba.com, Made in China.com, or other websites frequently used by foreign suppliers.

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