Agricultural film
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- 产品描述
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Introduction and Core Functions
The core principle of mulch film is to use physical covering to alter the soil surface environment and create a more suitable microclimate for crop growth.
1. Warming and Insulation: Transparent mulch film effectively transmits sunlight while preventing soil heat loss through long-wave radiation, significantly increasing soil temperature (especially in early spring and autumn), promoting seed germination and seedling growth.
2. Moisture Retention and Water Conservation: Effectively inhibits soil moisture evaporation, confining water circulation beneath the film, allowing water to be retained and recycled, greatly reducing irrigation needs.
3. Weed Suppression: Black, green, or double-sided black mulch film blocks sunlight, preventing weeds beneath the film from photosynthesizing, thus suppressing or killing them.
4. Improved Soil Structure: Prevents rainwater or irrigation from eroding and compacting the soil surface, maintaining a loose soil structure and preventing compaction.
5. Maintained Soil Fertility: Reduces nutrient leaching and loss, improving fertilizer utilization.
6. Promotes Early Crop Maturity: Combining the above advantages, it can effectively shorten the crop growth period, allowing agricultural products to be marketed earlier and improving economic benefits.
Classification by Material
High-Pressure Low-Density Polyethylene (LDPE): This is the most common mulch film material. It is soft, has good extensibility, and good film-forming properties, making it suitable for manufacturing ultra-thin mulch films. Its disadvantages are relatively low strength, moderate aging resistance, and a tendency to leave residues.
Linear Low-Density Polyethylene (LLDPE): Higher strength than LDPE, with better puncture and tear resistance, also suitable for manufacturing thin mulch films. Currently, it is often blended with LDPE to improve performance.
High-Density Polyethylene (HDPE): High strength, but poor flexibility and film-forming properties. It is generally not used to manufacture ultra-thin mulch films, but is mostly used for thicker films or special applications.
Biodegradable Plastics: This is the future development direction, aiming to solve the problem of "white pollution." The main raw materials include polylactic acid (PLA), polybutylene terephthalate (PBAT), etc. Under specific environmental conditions, it can be ultimately decomposed into carbon dioxide and water by microorganisms.
Classified by color and function
Type
Main Features and Principles
Typical Applications
Transparent Mulch
Has the best warming effect. Sunlight can directly reach the soil, but the weeding effect is poor.
Early spring warming, promoting germination, and cultivation in low-temperature periods.
Black Mulch
Has excellent weeding effect. It is almost opaque, preventing weeds from growing. Its warming effect is not as good as that of transparent mulch (heat comes from the mulch itself).
Widely used in plots with many weeds, such as watermelon, strawberry, and vegetables.
Silver-gray (Silver) Mulch
Repels aphids. Its reflective surface can drive away aphids that spread viruses. It also has certain moisture retention and warming effects.
Used in areas with frequent viral diseases, for crops such as melons and tobacco.
Black-and-white Double-sided Mulch
The upper layer reflects light (white), and the lower layer weeds (black). It can both reduce root zone temperature and efficiently suppress weeds.
Cultivation in high-temperature summer periods, such as Chinese cabbage and flowers.
Green Mulch
Can filter specific spectra and inhibit weed growth (the effect is not as good as that of black mulch). However, there may be environmental issues with colorants.
Mainly used in ornamental horticulture and some vegetables.
Herbicide-containing Mulch
Contains slow-release herbicides, which are released when soil moisture condenses, forming a medicinal film layer for efficient weeding.
Crops with high-efficiency weeding requirements for specific weeds.
Degradable Mulch
No need for recovery. It decomposes by itself under the action of soil microorganisms when it expires, being environmentally friendly and pollution-free.
Used in areas with high environmental requirements, and it is the fundamental way to solve residual film pollution.
The Production Process of Mulch Film
Mulch film is mainly produced through "cast extrusion" or "blow molding," with cast extrusion being more common because it can produce thinner and more uniform films.
Raw Material Formulation and Mixing: The main material (LDPE/LLDPE) is mixed with the required masterbatch (for producing black, silver, etc.), anti-aging agents (to extend service life), heat-insulating agents, and other additives in a specific ratio.
Melting and Plasticizing and Extrusion: The mixture is heated and melted into a viscous flow state through an extruder.
Die Forming and Casting: The melt flows evenly through a narrow T-die, forming a sheet-like melt curtain.
Cooling and Shaping: The melt curtain is cast onto a large-diameter cooling roller with a chrome-plated surface, where it is rapidly cooled and shaped into a flat film.
Traction and Winding: The cooled film is stretched by traction rollers (to control thickness), then subjected to corona treatment (to increase surface tension, facilitating printing), and finally wound into a large roll by an automatic winding machine.
Traction and Winding: The cooled film is stretched by traction rollers (to control thickness), then subjected to corona treatment (to increase surface tension, facilitating printing), and finally wound into a large roll by an automatic winding machine. Slitting and Packaging: According to the width required by the customer, the large roll of plastic film is slitted into smaller rolls on a slitting machine, and then packaged for shipment.
Agricultural film
If you need custom products,Contact us!
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