With the development of Commerce, all kinds of packing bags come out in a rush. In order to save cost when purchasing packaging bags, larger brand companies or companies that need the same kind of packaging bags for a long time all choose to purchase packaging roll films and make them into bags by using automatic packaging machines. In fact, the process of packaging roll films and bags is the same process of bag making.

So the purchase of roll film, composite film, composite roll film, aluminum plastic composite film should pay attention to the key points and matters needing attention? Please look down, I will give you a detailed answer
The main points of roll film, composite film, composite roll film and aluminum plastic composite film are as follows:
1. What is the appropriate diameter of composite film and composite film?
Answer: the diameter of the packaging film is determined according to the automatic packaging machine. Generally, the diameter is controlled at about 25cm.
2. What is the heat sealing temperature of roll film, composite film, composite roll film and aluminum plastic composite film?
A: the heat sealing temperature of the automatic packaging film is also determined by the packaging machine. There are 90 degrees of sealing and 200 degrees of high temperature.
3. In what range is the best friction coefficient of roll film, composite film, composite roll film and aluminum plastic composite film?
Answer: the friction coefficient of the roll film determines the speed of packaging. Theoretically, the smaller the better, it is generally between 0.2 and 0.3. It is recommended to control it at about 0.25. Of course, some packaging machines require a friction coefficient higher than 0.5. The reason is that the friction coefficient will slip when the friction coefficient is small, so it must be tested to determine.
4. How to specify the number of joints per roll of film, composite film, composite roll film and aluminum plastic composite film?
A: the national standard of joint requires that 70% of the whole batch of films have no joint, 15% allow one joint, 10% allow one joint, and 5% allow more than two joints. However, you can also directly require the supplier to have no more than one joint per roll of film. The splicing mode is adopted, and the red or yellow adhesive tape is used as the eye-catching mark at the joint.
5. What is the requirement of trimming evenness of roll film, composite film, composite roll film and aluminum plastic composite film?
Answer: the trimming error of roll film should be controlled within 1 mm, otherwise it will be uneven and seriously affect the production efficiency.
6. What are the printing quality requirements of roll film, composite film, composite roll film and aluminum plastic composite film?
A: what we need to pay attention to in roll film printing is that the knife line, plate stain and color registration are not accurate. If the knife line and plate stain are not visible to the naked eye, it is the standard. It is recommended that you sign the upper and lower deviation with the supplier for the printing color, which can be accepted. If the overprint error is greater than 0.02mm, the plate roller should find the first-class plate making company in China, and try to find the supplier with 10 color printing machines to print.
7. Roll film, composite film, composite film, aluminum plastic composite film surface crease requirements is how to look?
Answer: Dead wrinkle is not allowed. If the live wrinkle is less than 20cm in width, it is not allowed to exceed one within one square meter, and the length of crease shall not exceed 30cm. The cause of crease is the control of compound tension.
8. Do roll film, composite film, composite roll film, aluminum plastic composite film have peculiar smell, whether the residual solvent exceeds the standard, and if specified?
Answer: due to the solvent (butyl ester) and glue (polyurethane) used by ethyl acetate volatilization is not clean, can refer to the enterprise standard.
9. How to determine the weight of each roll of roll film, composite film, composite roll film and aluminum plastic composite film?
A: the weight of each roll is generally less than 25kg, and it should be controlled at 15kg ~ 25kg as far as possible. It is determined according to the width of the film, because the factory is generally female workers, which is convenient for handling.
Summary:
When purchasing automatic packaging film, we must look at the supplier's qualification and enterprise scale. Food packaging film needs to have QS certificate, and drug packaging film needs to have a drug package registration license. To understand the performance of the automatic packaging machine that has been purchased, if you don't know very well, we suggest that you ask the supplier who provides the packaging film to come to your site to see the automatic packaging machine We must purchase in small batch to test the machine, and see what problems exist in the film for subsequent improvement. For the suppliers who provide packaging film, the production environment and production process control are also what you need to pay close attention to. Regular enterprises have a number on the inner wall of each roll of paper tube, and each number is different, so as to facilitate reverse traceability; There are also packaging and transportation, must be stuffy + pallet + winding film + corner guard + cover plate + palletizing. If bulk transportation is adopted, the following problems may occur: due to the barbaric transportation of logistics transportation companies, the cartons will be damaged, the paper tube of film rolling will be deformed, and the surface of film will be dirty, especially the uncontrollable bacteria will be infected. I wish you all good luck in the process of purchasing. I hope the above can help you.