In recent years, the market has seen a surge in demand for "cool pads," which are mainly divided into two types. The first is a liquid cooling pad, including cooling caps. These use water as a cooling medium, and the natural evaporation of water provides a refreshing sensation. They are available on the market at prices ranging from 6 to 10 yuan. The second type is an ice crystal pad, a product made using modern technology. It uses polymer materials as refrigerants, with current market prices between 12 to 20 yuan. Its key features include maintaining a temperature below freezing, a slow heating rate, and the ability to inhibit heat conduction, allowing it to stay cool for a long time. Additionally, it behaves like solid water and does not leak or separate even when subjected to pressure or thawing, making it reusable over a long period.
First, let's look at the material preparation:
1. **Cooling Material Preparation**: Start by pouring 98.7 parts of clean water into an oil-free heating pot. Add 1 part of lime-fat resin, 0.2 parts of sodium polyacrylate, and 0.1 parts of ethylene diene. Slowly heat while stirring until the temperature reaches about 80°C, ensuring all materials dissolve completely. Once everything is evenly mixed, allow it to cool naturally to room temperature, then freeze the mixture. This process results in a cost-effective cooling material, priced at just 0.24 yuan per kilogram.
2. **PVC Fabric for Outer Cover**: Use PVC fabric that is 1.5 meters wide, costing 7.50 yuan per meter (or 5 yuan per square meter). Other waterproof and wear-resistant fabrics can also be used depending on availability and preference.
3. **Inner Film**: Choose thick-film material with high tensile strength and a stretching rate of 1.5 to 2 times. This ensures durability and proper sealing during the manufacturing process.
4. **Heat Sealing Machine**: A desktop heat sealer, portable and affordable, can be purchased for under 100 yuan, making it a practical tool for production.
Next, let's move on to the actual product production:
**Product Specifications**: Common sizes include a cushion measuring 43x38 cm, a pillow of 53x33 cm, and an ice pack of 25x12 cm. These are suitable for home sofas, car seats, and other everyday uses.
1. **Making a 43x38 cm Cushion**: Cut the fabric to 80x45 cm. Then cut the inner film into five pieces of 43x18 cm each. Fold the film so that the 18 cm side becomes 9 cm. Heat-seal each piece into a bag, place 500 grams of frozen ice crystals inside, and seal them. After freezing, arrange the five bags side by side inside the outer fabric cover. Sew the edges tightly and prepare the final packaging. The total cost per unit is around 2.8 yuan, making it a highly effective solution during hot summer months.
2. **Making a 25x12 cm Ice Pack**: Cut the fabric to 27x26 cm, fold it to 13 cm, and use slightly thinner film for the inner bag. After heat-sealing the rectangular bag, insert 600 grams of frozen ice crystals and place it inside the outer fabric cover. No additional delivery is needed. The total cost is approximately 0.9 yuan, and it can be sold for 5 yuan. This ice pack is ideal for treating fevers and burns, and every household should have one. Proper packaging is recommended for better presentation and shelf appeal.
Multi Span Plastic Film Greenhouse
Arch greenhouse is a kind of economical greenhouse, which is welcomed by the users with graceful curve form and low cost. It has beautiful appearance, fluent visual, reasonable structure and good performance for keep temperature. It is economical greenhouse because of its relatively low manufacturing cost. It can be applied in most areas of China. Double membrane greenhouse is used more in north of China, while single film greenhouse is used more in southern region. It can get maximum sunlight when visible light is within the scope of 0.4 to 0.7 microns and form a thick envelope, which can effectively prevent heat loss and prevent the invasion of cold air. Adopting a double membrane can greatly improve heat preservation performance of the greenhouse and save operating cost. The top cover material is polyethylene lifelong anti-fog and anti-dipping film po-covering. The outer of it has the function of UV protection and the inner has the function of preventing from the sets of dew. According to the needs of customers, the sides of the greenhouse can be covered with polyethylene lifelong anti-fog and anti-dripping po-covering or polycarbonate hollow plate.
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