7 KINDS OF HEAT SHRINKABLE FILM PACKAGING MATERIALS
Heat shrinkable film packaging materials
At first, The PVC shrink film was the main one. With the continuous development of market demand, PVC shrink film gradually decreased, and various PE, PP, PET, PVDC, POF, PO, etc. became the mainstream of the market.
1.PVC：The PVC heat shrinkable film is produced by polymerizing vinyl chloride monomer into polyvinyl chloride resin and then chemically modifying the polyvinyl chloride resin to produce the PVC heat shrinkable film by blow molding or calendering method. The PVC shrink film has good transparency and high shrinkage. Moreover, the cost is low, the tensile strength is large, the temperature shrinkage range is large, and the requirement on the heat source is not high. However, The PVC shrink film has poor environmental protection and is difficult to recycle. Toxic gases are produced during combustion, which is not conducive to environmental protection. It has been banned in Europe and Japan. China's environmental protection requirements are not very high, and the market sales situation is relatively good. PVC is still the most important material in the field of heat shrinkable labels.
2.PVDC：PVDC is a non-toxic, odorless, safe and reliable high barrier material. In addition to the general properties of plasticity, it also has oil resistance, corrosion resistance, taste retention, and a little moisture and mildew resistance. It can directly contact food. It also has excellent printability. PVDC is mainly used for packaging cold meat. The packaging of cold and fresh meat is achieved by using a vacuum packaging machine. Taking advantage of its high shrinkage and high barrier properties, the packaged cold meat not only has a good appearance, but also keeps fresh for a long time.
3.PET：The PET film is an internationally recognized environmentally friendly heat shrinkable film material. Polyester heat shrinkable film is a new type of heat shrinkable packaging material. The main features of the PET heat shrinkable film are: good shrinkage at low temperature, high shrinkage rate, fast shrinkage, five poisons during combustion and low fever. The PET heat shrinkable film also has high transparency, gloss and excellent heat sealability, suitable for high-speed packaging equipment, with good packaging effect, low cost, non-toxic and harmless.
Application in coal machinery packaging
For large products or a large number of single-piece products, you can use a hand-held shrink wrapper machine. This method of operation is simple, fast and economical. For small equipment, desktop shrink film wrapper machines can be used together to save costs.
How on-site heat shrink packaging works: a) Put the pre-cut negative heat shrink film and vapor phase anti-rust film on the bottom bracket in order, and then hang the entire device on the bottom bracket. b) After placing an appropriate amount of desiccant, cover the upper gas phase anti-rust film, wrap it and fix the gas phase anti-rust film with a stretch protective film. c) Use a portable heat shrink packaging machine to heat the heat shrink film evenly to shrink the film, and the film will shrink and adhere to the surface of the device. d) Use strapping straps to securely fix the device to the bottom bracket. e) Cover the top heat shrinkable film and trim it properly, then use a portable heat shrinkable packaging machine to collect the top heat shrinkable film.
If exported in batches, film bags can be made in advance according to the size of the equipment, which not only shortens the packaging time, but also reduces the cost of packaging materials.
PRODUCTION AND CHARACTERISTICS OF LUNCH BOX MACHINE
The lunch box machine is a machine that quickly manufactures lunch boxes. Compared with the previous machines, the main feature of the lunch box machine is that it eliminates the intermediate link "pulling" of the production of blister products. It is directly formed with plastic particles and scraps. It can also be used directly, which means that it saves the power consumption of reheating after pulling the tab, which is in line with the modern concept of environmental protection and energy saving.
Production of lunch box machine
How does the lunch box machine ensure the safety of the lunch box during production? In fact, the paper trays that we often use have a reflective film on the inside and outside. This layer of material is a polyethylene water barrier film. Every paper tray machine must ensure the existence of this film during the production process. Under the effect of air, the film is simply oxidized to produce a harmful compound. Therefore, in the industry of paper tray machines, this technology of adding film is usually called the soul technology in the production process of paper tray machines.
In addition, we all know that the fast food boxes currently used are basically manufactured using plastic fast food box machines. As a catering industry that mainly uses such plastic boxes, it can be said that it has also developed rapidly with the development of fast food boxes. Takeout packaging from the previous plastic bag packaging to the present fast food box packaging can be said to have been comprehensively developed in terms of hygiene and cleanliness. Here is a brief introduction to the standard of disposable plastic boxes in recent years.
An exquisite lunch box is very important for takeout. When we see that a take-out package is more refined, our first impression will be given a certain bonus, which is where the value of the package is for the industry. The current production of lunch box machines is also developing in a diversified direction.
Disposable lunch boxes are divided according to different materials: plastic lunch boxes, paper lunch boxes, starch lunch boxes, plant straw lunch boxes, etc., and their respective standards are different. Therefore, a manufacturer of disposable plastic lunch boxes must not only obtain a QS production license, but the quality of the products must also meet the requirements of the standard to be called a qualified disposable plastic lunch box. These standards are currently designed and manufactured through the mold of the lunch box machine.
Characteristics of meal box machine
The characteristic of the meal box machine is that the thickness of the product can be adjusted as needed. It is suitable for the production of PP blister packaging for internal and external packaging of foods such as tofu boxes, jelly cups, fast food boxes, bowls and trays. It is precisely because of the excellent performance of the lunch box machine that it is so popular in the market.
At present, most disposable plastic products are processed and manufactured using plastic molding equipment, including meal box machines and plastic cup molding equipment. Compared with general plastic processing equipment, the current sheet machinery is considered to be a better type of equipment. The reason for this is because the products produced by this machinery are currently used in cities. Including plastic lids, plastic boxes, plastic cups, etc., these are more used products. Among them, the disposable plastic fast food box produced by the lunch box machine is regarded as the most used takeout packaging form in the fast food industry. As the main packaging product, the small food box is now compared with the previous plastic bag packaging It is relatively clean and tidy, giving people a certain sense of refinement.
If you want to order a paper box machine, it is recommended that you consult the company's customer service before buying, they will provide you with quality service and useful information.
The product youtube address is https://www.youtube.com/watch?v=beHZAAdH-Ns
The product website address is https://www.paper-cupmakingmachine.com/china-automatic_hamburger_kraft_paper_lunch_box_machine_80_160_pcs_min-26539456.html
DO YOU KNOW THE REPAIR AND MAINTENANCE OF DIE CUTTING MACHINE?
The die-cutting machine is a machine that cuts the cardboard into a certain shape through a knife mold, and it is an important equipment for packaging processing. In recent years, with the development of science and technology, die cutting machines have gradually developed towards automation, intelligence, and multi-function. Then, do you know what common failures are in the maintenance of die cutting machines? How should we maintain the die cutting machine?
Die-cutting machine repair common faults
1. Die cutting indentation is inaccurate: the position of die cutting and printing is not aligned, the cardboard is inconsistent with the rules, the position does not match the printed product, the paper position is inconsistent during the operation or the paper is deformed, etc. The reason for the inaccurate location.
Solution: Recalibrate the template, align the printing and die-cutting grid positions, and adjust the positioning rules of the die-cutting machine uniformly to ensure the consistency of the paper feeding position.
2. The die cutting edge is not only bad: the steel knife of the die cutting machine is of poor quality, the knife edge is not sharp, and the adaptability to the die cutting is poor, the steel knife is seriously worn and not replaced in time, the machine pressure is not enough, and the pad paper is not properly handled during operation The reason for the die-cutting edge.
Solution: Replace with a new blade, check the die-cutting pressure, and replace the backing paper.
3. The indentation is not clear and there is a dark line: the dark line indicates the indentation that should not appear, and the fried line is a cardboard break. The reasons for these two situations are the inaccurate thickness of the copper wire pad paper, the pad paper is too high or too low; the pressure is too large or too small, the adjustment is not correct; the paper quality is not good, etc.
Solution: readjust the thickness of the copper wire stack of the die-cutting machine, adjust the pressure of the die-cutting machine, and select the best quality paper according to the process.
4. Cardboard sticking knife plate after die cutting: The reasons are that the knife edge is not sharp, the knife edge is not resilient enough, and the paper is too thick, which causes excessive pressure during die cutting.
Solution: Ensure the blade of the die-cutting machine is sharp, check the rebound level, and check the die-cutting pressure.
Maintenance measures of die cutting machine
1. Operators should pay attention to dust and clean. In actual production, a large amount of waste paper edges will be generated when die cutting the carton, and if it is not noticed, it will enter the chain transmission part, the moving platform of the die cutting part and some rotating motion parts, and may block the photoelectric detection head, etc. Cause malfunction. Therefore, the cleaning of the body of the die-cutting machine must be placed first, and then the machine can be operated without failure.
2. Oil change of die cutting machine. The main action of the die-cutting machine is that the main motor drives the slide bar and the pulley, and then drives the four pairs of toggle bars to move. It can reach 6000 sheets / hour in high-speed work. Without good lubrication and cooling is very troublesome.
How should we use the die cutting machine correctly? The next article tells you the answer.