Wrapping film manufacturers teach you how to identify high-quality flexible stretch film
Stretch film in the use of the time often encounter the problem of poor stretch, which is the user is a headache, and the poor stretch is easy to lead to the winding effect is not good, the effect of winding packaging Reduce, so you consumers pay attention to the purchase of winding touch, and must be on the stretch film stretch performance identification, then how to identify high-quality flexible stretch film? The following detailed description:
First from the winding film along the length of the direction of tearing, and then from the horizontal direction of the tear, good tensile strength of its impact on the strong, toughness is easy to tear, if too thin, then the toughness will be greatly Of the reduction, stretch is not good, so when the purchase of stretch film can not blindly pursue cheap, and go to buy some poor quality wound film.
Stretch film commonly used in packaging paper, logistics, chemicals, plastic raw materials, building materials, food, glass and so on. Good self-adhesive, high transparency and other items. Common colors are white, light yellow. Common specifications are wide 40,45,50 cm, length in meters, but also can be customized according to user requirements. SY winding film manufacturers using international advanced equipment and three-tier co-extrusion technology. Equipment has intelligent control system, concealed automatic cutter, automatic break material, automatic roll change and other functions, in order to achieve full automation operation. To ensure that the winding more solid, smooth. Overseas imports of raw materials + advanced production equipment. Quality raw materials, from the source to control the quality. International advanced production equipment, the quality and quantity. Production processes Cengcengbaguan to ensure 100% quality. Direct stretch products: stretch film, PE stretch film, packaging stretch film, logistics stretch film, etc., to provide stretch film wholesale, PE stretch film wholesale, packaging stretch film wholesale, logistics stretch film wholesale. If you need a friend can call the consultation!
What factors determine the thickness of the Stretch film
Stretch film is most widely used in the logistics industry, mainly used to package a variety of goods, think from two aspects about the packaging costs and performance requirements, we should be carefully ponder on how to choose the thickness of the stretch. In general, the thickness of the stretched film can be determined by generalization and standardization of the market. The strength support is generally determined by the weight of the packaged product, and the functional stretched films thickness is generally determined by the shelf life of the product. So what factors determine the thickness of the stretch film? Here to introduce:
1, according to the unit volume or unit surface area of the maximum allowable number of microorganisms to determine, the method is mainly suitable for mildew proof packaging which was very sensitive to microbial, the key is to determine the type of microbial in the products and the rule of its growth and reproduction.
2. According to the maximum allowable water absorption or the maximum allowable dewatering capacity of the product, the method mainly adapts to the design for moisture-proof packaging. The key is used to calculate the moisture permeability coefficient of the stretched film.
3, according to the maximum allowable oxygen absorption of packaged products to determine the method is mainly suitable for products is very sensitive to oxygen products barrier packaging, the key is to calculate the stretch film oxygen permeability coefficient.
4, according to the maximum allowable permeation of carbon dioxide or oxygen permeability to determine the method, the method is mainly for the product of inflatable packaging, a active products is need oxygen insurance and maintain a bright color, but also need high concentrations of carbon dioxide to Inhibited microbial growth and reproduction, the key is to calculate the stretch film oxygen permeability coefficient and carbon dioxide coefficient.
The cause of light yellow in the production process of the stretch film
拉伸膜在生产过程中出现淡黄色的原因Stretching film will appear yellowish when it is produced. Many people have doubts that if the stretching film appears pale yellow, can it still be used?
拉伸膜在生产时会出现淡黄色，很多人都有个疑问，拉伸膜出现淡黄色还能用吗?下面为大家讲解在生产过程中出现淡黄色的原因：
Strictly speaking, stretch film and color two only colorless, pale yellow appearance is mainly Dov, masterbatch and other additives or process changes, if the color is shallow, and the stretching rate is not affected by the tackiness you can use, if the color is not natural, general quality will be very poor.
严格来说拉伸膜只有无色和彩色两种，出现淡黄色主要是dov、色母等添加剂或者加工工艺改变造成的，如果颜色浅，拉伸率和自粘性不受影响的话可以使用，如果颜色不自然，一般质量就会很差。
Stretch film production technology development today has been very mature, some manufacturers will try to change the formula to stretch film production of different properties, mainly reflected in three aspects: color, tensile rate and self adhesive, single color change does not affect the use of stretch film, you know most of the time due to the melting temperature of different processing set that change will cause the stretch film color, but will not affect the transparency, this is a good stretch film, if the drop rate and the tensile properties of adhesive, stretch film is poor, he may be mixed with impurities.
拉伸膜发展到今天生产工艺已经很成熟，一些厂家会试着改变配方来生产不同性能的拉伸膜，主要反映在三个方面：颜色、拉伸率和自粘性，单一的颜色改变不一定影响拉伸膜的使用，要知道很多时候由于加工设定的熔融温度不同，会引起拉伸膜颜色的变化，但是不会影响透明度，这样的就是好的拉伸膜，如果拉伸率和自粘性能下降，就是差的拉伸膜，可能掺了他杂质。
If the color of the stretched film is pale yellow, but the diaphaneity, the stretching rate and the self stickiness do not change, and there is no peculiar smell. It can be used. If four indicators change, do not use it again.
如果拉伸膜的颜色是淡黄色，但是透明度、拉伸率、自粘性没有变化，而且没有异味，可以使用，如果四个指标出现变化，就不要再用了。
How to solve the problem of bubbles in the production of stretch film
Stretch film will produce bubbles in the production process, first, Observe whether the bubble is regular. If the bubble is regular, there may be a problem with the roller, if there is no regularity, there may be glue and pressure on the glue or glue leveling is not good. Temperature control, stretch film residual solvent, too fast and so will produce bubbles.
When this happens, we should consider the method to be solved based on the type of bubble generated. Increase the pressure, control the amount of glue and speed, or to improve the temperature, the bubble can be solved. If the winter or similar PE stretch film on the anti-counterfeit standard bubble, the solution will have to be based on the sample.
It is worth noting that there is a special bubble is a composite process and stop the material, the joint parts of the bubble. (When the film is PE when the thickness of more than 5 silk will produce this situation).
Generally over the joints produce large area of bubbles, the operator with a knife to cut, bar, in the course of this operation is a dangerous operation and waste.
In fact, to solve this problem is very simple: in the stop when the material can be reversed tape. Is affixed with bubbles, anti-paste film will break material, positive and negative paste can not only solve the bubble and ensure that the stretch film production continues to material, the effect is better, composite loss and stretch film loss less. Due to the composite press roller angle and the tape is attached to the tape when the advanced composite pressure roller caused by the joint bubble, the two sides paste the best results, the least waste.
Precautions about the use of machine stretch film
Top ten problems about stretch film packaging goods
1, tension is not uniform
Stretch film tension is usually not uniform. it resulting the inner layer is too tight, the outer layer is too loose. If you use this film on the stretch film packaging machine, it will cause the packaging machine to run unstable, there are uneven packaging size, make the film skewing, edge deviation is too large and so on, resulting in packaging products do not meet the quality requirements.
2, fracture surface is not uniform
Usually stretch film fracture surface needs been smooth, convex more than 2mm will be judged as non-conforming products, its not be accepted. fracture surface of the stretch film will also cause the stretch film packaging machine running unstable, make the film skewing, edge deviation is too large and so on.
3, wave surface
Wave surface is the finished stretch film surface uneven and bending, shaped like wave, this quality defects will directly affect the stretch film in the stretch film packaging machine running performance, and affect the quality of the final packaging products, such as packaging materials, stretching Performance, sealing strength deterioration, printing patterns and packaging deformation, etc., if this quality defects are obvious, such a stretch film can not be used in the stretch film packaging machine.
4, slitting deviation is too large
It is usually required to control the slit deviation of the stretched film within 2 to 3 mm. slitting Deviation too large will affect the package, such as pattern position offset, incomplete, asymmetrical packaging and so on.
5, poor quality joints
The quality of the joint is generally the number of joints, joint quality and joint requirements. Stretch film joints should be smooth, smooth, solid, can not overlap lap, the joint position is best in the middle of the pattern, and adhesive tape should not be too thick, otherwise there will be card film, film and cause downtime, affecting the stretch film packaging machine normal operation. Moreover, the connector should be clearly marked, easy to check, operation and processing.
Stretch film manufacturers
6, core deformation
Core deformation will cause the stretch film can not be properly installed in the stretch film packaging machine fixture. The main reason for the deformation of the film is to damage the core of the storage and transportation, the volume of the roll film is too large, and the core is poor in mass and the strength is low. For the core film deformation of the stretch film, usually returned to the supplier to rewind and replace the core.
7, stretch film direction wrong
Most stretch film packaging machine on the stretch film of the film direction of a certain request, such as the bottom of the first out or the first out first, which is mainly based on the structure of packaging machines and packaging products, decorative design design may be. If the direction of the stretched film is wrong, rewinding is required.
8, lack of length
Usually the length of the stretch film in units of measurement, such as 200m / volume, the specific value is mainly based on the use of the packaging machine stretch film maximum diameter and load capacity may be.
9, product damage
Product damage occurs in the cutting of the completion of the delivery to this stage, mainly stretch film damage (such as scratches, tear, holes), stretch film contamination, packaging damage (damage, water, pollution) and so on.
10, product labeling is not complete
Stretch film should have clear product identification, the main contents include: product name, specifications, packaging quantity, order number, production date, quality and supplier information. This is mainly to meet the delivery acceptance, storage delivery, production use, quality tracking and other needs, to avoid the wrong delivery and use.
Shenzhen World Packing Industrial Ltd
Stretch Film & Packing Tape Specialist , Top China manufacturer
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