The constant underground temperature of 12 °C (54 °F) has been utilized in preserving ice collected 

during winter months in the form of underground pits since Roman times.

The temperature of the soil is held relatively constant year-round when taken below the frost line, 

located 0.9 to 1.5 m (3 to 5 ft) below the surface, 

and varies from about 7 and 21 °C (45 and 70 °F) depending on the region. 

Prior to the convenience of having refrigeration inside the home, 

cold storage systems would often be located underground in the form of a pit. 

These pits would be deep enough to provide thorough insulation 

and also to deter animals from intruding on the perishable items within. 

Early examples used straw and sawdust compacted along the sides of ice to provide 

further insulation and to slow the ice melting process.

By the year 1781, personal ice pits were becoming more advanced. 

The Robert Morris Ice House, located in Philadelphia, 

brought new refrigeration technicalities to the forefront. 

This pit contained a drainage system for water runoff as well as the use of brick and mortar for its insulation. 

The octagon-shaped pit, 

approximately 4 meters in diameter located 5.5 meters underground 

was capable of storing ice that was obtained during the winter months to the next October or November. 

Ice blocks collected during winter months could later be distributed to customers. 

As the icebox began to make its way into home during the early to mid 19th century, 

ice collection and distribution expanded and soon became a global industry. 

During the latter half of the 19th century, 

natural ice became the most second most important US export by value, after cotton.

Accept OEM/ODM Orders
Yongkang Senhua Cups Co. Ltd is located in China hardware capital, Yongkang, Zhejiang. After years of development, we have seven production departments, including the metal, welding, painting, and vacuuming departments. Our construction site covers an area of 15,000 square meters, with more than 220 personnel. We have more than a dozen professional designers with strong design strengths.

Backed by Well-trained and Skillful Personnel
With skilled workers, a professional technical team, a perfect production line, and an advanced quality control system, we have cooperated with domestic and foreign merchants for many years and won the trust of customers with our high-quality products and integrity.

Over 30 Production Processes for Insulated Cups
We always adhere to the fundamental requirement of quality first, and strictly control the quality. We have more than 30 production processes for insulated cups, and each process will be strictly controlled to make products that satisfy customers.

Be Our Partner Today
Quality first, integrity is the principle, and better service is the goal. We sincerely welcome new and old friends to visit the factory and look forward to establishing a long-term business. If you are looking for a factory for your own brand cup, please contact us and we will serve you wholeheartedly.