Characteristics of Warming of Covered Farmland in heat shrinkable film

The characteristics of soil warming of covered farmland in heat shrinkable film are as follows:

1. From sowing to harvesting of spring-sown crops in heat shrinkable film, with the increase of atmospheric temperature and leaf area, the warming effect gradually decreases.

2, the coverage is large, and the effect of heating and insulation is good. With the increase of coverage, the ground temperature of 5 cm tends to increase, and the accumulated temperature also increases.

3. Under different climatic conditions, the warming effect of covered farmland in heat shrinkable film is obviously different, especially in sunny days.

4. The variation of the ground temperature of the farmland covered in heat shrinkable film has an obvious trend of decreasing with the deepening of the soil layer, with a great change above 40 cm and a small change below 40 cm.

5. The diurnal variation of 5 cm ground temperature, with 20 o'clock as the increasing temperature period and 14 o'clock as the high ground temperature period.

With the development of heat shrinkable film market, the homogeneity of shrink film products is becoming more and more obvious, and the difference between shrink films produced by shrink film manufacturers is getting smaller and smaller. Therefore, increasing efforts in shrink film packaging can highlight the theme of products and attract consumers.

In the subdivided shrink film market, designing a pvc shrink filmthat meets the needs of different similar shrink film markets reflects the skill of a manufacturer in marketing. Under the background that environmental protection has become an industry, more and more manufacturers choose low-carbon and environmentally-friendly packaging methods and materials by increasing research technology.

Manufacturers in the industry have been playing the slogan of environmental protection in packaging, using new materials, introducing clean production mechanism, and adopting green, environmentally friendly, low energy consumption, low pollution and low emission-based (economic model) production mode and product structure, thus reducing carbon emissions and realizing sustainable economic development. With the widespread use of PVC shrink film in daily life, manufacturers should meet the requirements of simplicity, practicality and simplicity from the beginning of packaging design.

Heat shrinkable film is made of vinyl PVC resin mixed with more than a dozen accessories and then inflated twice. Its use method is to calculate the circumference according to the size of the wrapped object, convert the folding diameter (folding diameter =1/2 circumference), and then appropriately enlarge the folding diameter. According to the product specifications of our factory, heat shrinkable film selects the appropriate PVC heat shrinkable sleeve film. Install the sleeve film on the package at the temperature of 100℃-160℃ for 6-10 seconds (the actual temperature of the sleeve film is 86℃, and the temperature rise of the package is less than 10℃).

1. Heat shrinkable packaging can package special-shaped products that are difficult to package by ordinary methods.

2. Heat-shrinkable packaging has good sealing, antifouling and antirust effects, which can prolong the storage period of food, facilitate storage and facilitate open-air stacking.

3. heat shrinkable film has high transparency, so the label has bright color and good luster.

4. heat shrinkable film can provide 360-degree decoration for packaging containers, and can print commodity information such as product description on labels, so that consumers can understand the performance of products without opening the packaging.

5. heat shrinkable film is close to the goods after shrinking, and the packaging is compact and can show the appearance of the goods, and the packaged goods are beautiful.

6, shrink film performance is good, but also has a good strength, accept the weight of the contents.

Heat shrinkable film has the following characteristics:

1. After the package is shrunk, it will be stored at 30℃ without color change such as fading and discoloration;

2, the flexibility is good, and after the package is shrunk, it will fall on the cement floor from 1 meter high in different directions for three times without cracking;

3, the thermal shrinkage rate is good, the transverse shrinkage rate is 48 3%, and the longitudinal shrinkage rate is 12 3% close to the product, which can be shrunk by a thermal shrinkage machine, a hair dryer or boiled water;

4. The product has smooth surface, uniform thickness, no obvious spots, no oil stains, impurities and folds.