The stretch wrap film we use for packaging products is usually colorless and transparent, but we also noticed that the stretch wrap film produced by many stretch wrap film manufacturers will also have other colors, so the stretch wrap film of other colors what’s the point?
Color stretch film
Different from the traditional transparent color stretch film, the color stretch film can classify, distinguish, mark and keep the packaged items secret. It not only retains the performance characteristics of conventional packaging, but also adds color changes, which is conducive to increasing packaging grades and product differentiation. Scope of application: Manufacturers who need to distinguish packaging labels or upgrade packaging grades. Regular colors include: red, green, black, milky white, blue, etc.
Before the stretch wrapping film is colored, the operator needs to be trained to master the method of mixing and coloring with colorants, and then understand the properties and effects of all colorants. Such as color, shade, migration, heat resistance, chemical stability and other aspects should be grasped. And have a wealth of color matching experience to be competent for this coloring job.
For experienced operators, the visual color matching method is not difficult for experienced operators, but it is difficult for newcomers. For the stretch film with strict coloring requirements, it is necessary to use a scientific method for color matching without any mistakes. In the production process of stretch film products, some matters need to be paid attention to, and the products need to be checked again.
Check whether the trimming of the product is qualified. If we are trimming the trimming, it cannot be shipped as a good product. Including gas cutting, we must keep both ends neat, so when packing, even if there is a problem , and there can be no problems, so even if there is a burr, there can be no problems, and no problems can occur.
Black Stretch film
Black stretch wrapping film is one of the color wrapping films. It is cost-saving, non-toxic and tasteless, and is a new generation of packaging materials. After heating to the glass transition temperature, it remains stable at room temperature, and thermal shrinkage occurs, and the thermal shrinkage rate can reach more than 70%. The black stretch film belongs to polyester, which is environmentally friendly and easy to be recycled.
It can effectively prevent theft. The black stretch film has the functions of moisture-proof, dust-proof, solid-proof and anti-lost for the packaged goods. The black stretch film is suitable for the outer packaging of valuables. Widely used in long strip building materials, food containers, glass ceramics, fertilizers and cement, resin raw materials, cloth, empty cans and solid cans and other packaging, carton trays. The general specification is 50CM wide, and the stretch film has two series, organic and manual, with a weight of 4KG. Special specifications can be customized.
Temperature of process conditions
The process conditions for making black stretch film are closely related to temperature. The production of black stretch film requires a higher process. In order to obtain high-performance and high-quality black PE stretch film, it is necessary to strictly control its process conditions. The production conditions of black stretched film are very harsh, the melting point is 178 °C, and the maximum crystallization temperature is 141 °C. The stretching process conditions are mainly related to temperature. In order to obtain high-performance and high-quality black stretched film, strict control is required. Black stretch film process conditions. It needs to go through four stages of preheating, stretching, heat treatment and cooling. The preheating temperature should be controlled at 170 °C, the stretching temperature should be controlled at 150-158 °C, the stretching ratio is generally greater than 9, and the heat setting temperature should be avoided as much as possible. The crystallization temperature when the maximum crystallization rate is opened is 168°C. Secondly, the black wrapping film is the same as the ordinary transparent wrapping film. It also has the functions of moisture-proof, dust-proof, anti-lost, and prohibition on the packaged goods, saving costs. The same material is also non-toxic and tasteless. It is a new generation of packaging materials. Since then, it has been favored by more and more users. We know that stretch film products are widely used in carton trays, and black stretch film is suitable for the outer packaging of valuables, long building materials, food containers, glass ceramics, fertilizers, cement, resin raw materials, cloth, empty cans and other packaging. Carton Tray.
Difference from clear stretch film
The black stretch film is basically the same as the ordinary stretch film, except that the black wrapping film has a more strict production process, and the black wrapping film is often used on valuables, so the black or colored wrapping film is generally required. Slightly more expensive than normal wrapping film.
4 main uses of the Stretch film in detail from the functionality
1. Airtight packaging:
Airtight packaging is equivalent to shrink film packaging, the film wraps the tray around the tray, and then heat seals the two sides of the film together to produce a hermetic packaging.
2. Full-width packaging:
Full-width packaging requires that the film width is sufficient to cover the tray, and the shape of the tray is standard. Generally, the thickness of the suitable film is 17-35 μm, and the size must be customized by the processing factory.
3. Manual packaging:
Manual packaging is a very simple type of wrapping film. The manual wrapping film is placed on a shelf or held by hand, and the tray is rotated or the film is rotated around the tray. Manual wrapping film packaging is mainly used for general pallet packaging and repackaging after the pallets wrapped are damaged. The packaging speed of manual wrapping film is relatively slow, and the suitable film thickness is 15-20 μm.
4. Stretch film wrapping machine packaging:
It is a mechanical equipment packaging method. The tray is rotated or the film is rotated around the tray, and the coiled film is fixed on the support frame and can be moved left and right. This type of packaging has a very large working capacity, about 15 to 18 trays per hour. A suitable film thickness is about 15 to 25 μm.
It is generally suitable for containerized packaging of export trade, food industry, paper industry artwork, glass ceramics, periodicals, electronic equipment, chemical raw materials and other commodities.
From the application scenarios of stretch film:
1. Packaging pallet: wrap the goods on the pallet to form a whole to prevent deformation, loosening, and collapse during factory turnover or logistics transportation; and to prevent moisture, dust, and damage.
2. Carton packaging: The use of stretch wrapping film as the packaging film can protect the carton from being wet by rain, and at the same time avoid the loss of the carton loose after the express delivery violently smashes it.
3. Machine cover: Machines that are not often used can be wrapped with several layers of stretch wrapping film to prevent the machine from rusting due to excessive storage time and excessive humidity, and can also be used as a dust-proof function.
4. Heterosexual product packaging: When packaging special-shaped products, it is impossible to customize the fixed stretch wrapping film. At this time, it can be wrapped with cling film. Multi-angle full (separator) directional packaging without dead ends can meet your (separator) packaging needs.
5. Product surface protection: The plastic wrap has good self-adhesion, but will not form residual glue on the packaged object. It can be attached to smooth surfaces such as glass, building materials, ceramics, doors and windows. to prevent being scratched by sharp objects.
From the purpose of using the stretch film
The stretch film is produced in proportion by imported linear polyethylene LLDPE resin and special additives for tackifier. The produced wrapping film has high strength and elasticity, can tightly wrap any geometric shape of the product, and can effectively avoid bundling. If the product is damaged, it has excellent anti-loosening, rain-proof, dust-proof and other effects.
