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The correct choice of pressure sensitive adhesive material effectively improves the quality of die-cutting in several matters needing attention.

1. Do not use die-cutting paper material die cutting plate ie cutting film material because the blade has been worn, and is not suitable for die-cutting film.
2. Flat pressing dies cutting, as far as possible to reduce the die cutting area, especially full plate small label, because the board is large, row knife, quality is difficult to ensure.
3. Flat pressing flat dies cutting plates to often replace, especially processing long plate live, because the cut mark will affect the quality of the new format label die cutting.
4. Flat pressing die cutting, die cutting strength should be just right, this is the master’s knife technology, and sometimes prefer to cut some shallow.
5. Often check the quality of die cutting, especially automatic labeling labels. To avoid mass quality problems. The specific detection method is to smear the release paper with a signal pen to check the penetration of the cut marks on the release paper.
6. Die-cutting large areas, and complex patterns of labels, to professional manufacturers to make die-cutting plates, so as to ensure the precision of die-cutting.
7. To keep the blade sharp, establish a file, and record the use of each die-cutting plate, in order to replace the blade in time. To use small angles, high hardness of special blade die cutting film pressure sensitive adhesive materials, especially PE materials.

Effect of adhesive on die cutting

There are 4 types of adhesives commonly used in pressure-sensitive adhesive materials:

1. Acrylic water-based pressure sensitive adhesive
2. Rubber hot melt adhesive
3. Ssolvent rubber
4. Acrylic adhesive

Due to the different raw materials and formulations of adhesives, the physical and chemical properties are not the same. Water latex is composed of tiny capsules, relatively small cohesion, and easy separation between the film.

In the die cutting pressure sensitive adhesive material, if the die cutting is not in place, either the label and the waste paper edge together are stripped, or the release paper is cut through. Because the hot melt layer can only be completely cut off (or most of the cut off) to normal waste, otherwise not cut through the film will be stripped together with the label, improving the difficulty of die cutting.

Therefore, it is relatively easy to die-cut latex pressure sensitive adhesive materials, and hot melt adhesive pressure sensitive adhesive materials have higher requirements for die-cutting technology. This is also the processing of hot melt adhesive material consumption, the main reason for low production efficiency.

The influence of the substrate of pressure sensitive adhesive material on die-cutting

The main factors affecting the quality of die cutting are the type of substrate, strength, and thickness.

1.  The type of substrate

The substrate can be mainly divided into paper and film two categories. The cutting principle of ordinary paper is slightly different from that of film materials. Based on the die-cutting characteristics of paper materials, and taking into account the wear of the blade, the Angle of the flat die-cutting blade is usually specified as 52 degrees, if the Angle is large, the extrusion deformation of the material is large, that is, the horizontal separation force will make the material fracture separation phenomenon intensified.

The die-cutting of thin film materials is simply the process of completely cutting through. Because thin film materials are mostly ductile and will not break naturally, it is not suitable to cut through two-thirds. It is necessary to cut through completely or four-fifths of the thickness, otherwise the product will be stripped together during waste discharge.

Die cutting film material blade is too sharp, high hardness, to use a small Angle die-cutting knife, the blade Angle is usually 30°~ 42°. If the use of a large Angle dies cutting knife, not only die cutting is difficult, and if the blade is not sharp there will be substrate cutting not through, release paper fracture, or the edge of the die-cutting product flanging phenomenon, resulting in gluing.

In short, the precision of die-cutting film is higher than that of paper materials, so die-cutting film materials have certain requirements for equipment accuracy, die precision, and release paper.

2. The strength of the substrate

The strength of the substrate and substrate thickness, fiber (polymer) structure, and its own humidity. In the die-cutting process of pressure sensitive adhesive materials, the factor related to the substrate is the waste removal speed. The greater the humidity of the environment, the weaker the strength of the material after moisture, so that it is easy to break, or even unable to discharge waste.

Layout design, according to the strength of the material, through the test reasonable arrangement of die-cutting product waste size and waste speed, which can not only improve production efficiency but also reduce material waste.

3. The thickness of the substrate

The thickness of the material directly affects the depth of die cutting, the thicker the material, the easier it is to die cut. Because the thicker the material, the greater the die-cutting tolerance, and the less chance of cutting through the release paper. Relatively thin material, easy to cut through the release paper failure.

So die cutting thin substrates, must be carried out on high precision equipment, as far as possible to reduce the die-cutting area (especially small products), the use of professional die manufacturers of the die.

The thickness of the substrate is proportional to the strength, which directly affects the discharge rate. Can respectively use 80g/㎡ and 60g/㎡ material to do a waste comparison test, the result is that the former than the latter production efficiency increased by 20% to 30%.

What is defoamer？

Defoamer is a substance with low surface tension and high surface activity, which can inhibit foam in liquid, that is to say, defoamer can reduce the surface tension of water, solution, suspension, etc., to prevent foam from producing or making the original foam.

What is Long-time defoaming？

Long-time defoaming is also known as defoaming, the length of defoaming time is the main symbol of the quality of the defoaming agent. In most cases, the use of a defoamer is to take advantage of its anti-bubble properties, rather than the initial defoamer. Defoaming and defoaming are relative, and the relative defoaming performance of products with good defoaming performance will be poor. In practical application, it depends on the specific situation. Therefore, from the point of view of the defoaming effect, the defoaming agent includes the defoaming agent, defoaming agent, and defoaming agent, which are called the defoaming agent.

Why need to use a defoaming agent？

Some components of water-based adhesives are easy to produce bubbles and have a stable and lasting tendency. In addition, the production of rapid mixing and the use of high-speed brushing construction will also contribute to the generation of foam, so that production can not proceed normally, and affect the quality of the product. The formation of foam in the production and coating of tape to great difficulties, and make the rubber layer appear as pores, affecting the product outside and adhesive properties, so we must try to destroy the foam or prevent the generation of foam, quite effective method is to use a defoaming agent.

Two main categories of defoamer

There are many varieties of defoamer used in the water-based adhesive industry, but there are mainly two categories: polysiloxane defoamer and non-siloxane defoamer.

Polysiloxane defoaming agents have strong defoaming and anti-foaming abilities and are widely used in the coating industry. In the water-based adhesive industry, especially the emulsion types low viscosity systems, such as film adhesive, and pressure sensitive adhesive, it is very easy to cause shrinkage and fisheye problems. In addition, after the emulsion film formation, due to the surface migration of silane, it will cause a decline in the later bonding strength and affect the bonding effect, so it is rarely used.

In the water-based pressure sensitive adhesive and coated adhesive industry is generally used in mineral oil defoamer. It is mainly composed of mineral oil, hydrophobic particles, low carbon alcohol, emulsifier, and so on. The quality of this kind of product is easily affected by the brand and batch difference of mineral oil. As the whole system is thermodynamically unstable, it is easy to stratify and provide defoaming effect mainly by dispersing in the emulsion.

Affected by small molecular additives and surfactants in emulsion, mineral oil defoaming agent is easy to float oil in these systems, which will cause a serious decrease in defoaming effect. The uneven distribution of mineral oil will also affect the coating effect, which brings great trouble to our production and application.

Smprotectivefilm–Wuxi Changsheng Adhesive Products Co., LTD.

Wuxi Changsheng Adhesive Products Co., LTD., the company specializes in R & D, production, and sales of pressure-sensitive adhesive series products, if you need to consult, you are welcome to inquire or Email.

What is pressure sensitive adhesive？

Pressure sensitive adhesive is mainly acrylic and rubber series of solvent or latex adhesives. Due to the need for high-speed operation, reasonable coating, and elimination of solvent pollution problems, the development of warm melt pressure sensitive adhesive, hot melt adhesive, and pressure sensitive adhesive characteristics in one, no solvent, no pollution, and easy to use. It is applied in a molten state, cooling, and curing after applying mild pressure to the adhesive effect.

It has high peeling power. It is suitable for the adhesion of pressure sensitive tape, labels, BOPP, double-sided tape, paper cloth, and other materials with high stripping force. It can also be used for bonding all kinds of plastic paper and pasting nameplates and trademarks on all kinds of materials.

• High peeling strength, good initial adhesion, and retention
• Excellent compatibility with all kinds of color master
• Excellent transparency
• Excellent stripping performance, strong cohesion of the film
• Water-based emulsion, non-toxic and non-combustible,
• Single component, easy to use
• Fast drying speed
• Good aging resistance

Use of pressure sensitive adhesive

Pressure sensitive adhesive has a wide range of applications, which can be used in diapers, women’s products, double-sided tape, labels, packaging, medical and health care, bookbinding, surface protective film, wood processing, wallpaper, and shoe making. Among them, the consumption of HMPSA for packaging is large, accounting for almost half of the total.

The main component of hot melt pressure sensitive adhesive is styrene thermoplastic elastomer. Hot melt pressure sensitive adhesive has the advantage of no solvent, so no air pollution, and high productivity. But the disadvantage is heat resistance, and lack of cohesion. New thermoplastic elastomers such as SEBS, SEPS, and epoxidized SBS are used to prepare warm melt pressure-sensitive adhesives with higher properties.

New acrylic ester block copolymer heat resistance, oxidation stability, UV stability, and good adhesion to HDPE, stainless steel, glass, polystyrene, acrylic plate, polycarbonate, nylon, polypropylene, and other materials, can be used to make the medical tape, transparent film, labels, etc. Acrylic polymer combined with a water-soluble polymer to produce hot melt pressure sensitive adhesive with water dispersion. Acrylic polymer disperses into non-adhesive particles below 100μm in weak alkali aqueous solution, which is easy to separate and suitable for recycling old paper. Acrylic copolymers with low Tg were obtained by copolymerization of acrylate monomers containing the benzophenone group.

Warm melt pressure sensitive adhesive, UV irradiation easy crosslinking, the advantage is that there is no need to add photoinitiator, no initiator residue problem.

Can be low temperature (120~140℃) warm melting coating, low VOC, low odor, no skin irritation, and good thermal stability. The composition of pressure sensitive adhesive tape is a special type of adhesive, that is, the adhesive liquid is coated on the substrate and processed into a strip, and made into a coiled supply, including solvent-activated adhesive tape, heating adhesive tape, and pressure sensitive adhesive tape. The composition of pressure sensitive adhesive tape: ① pressure sensitive adhesive ② substrate ③ bottom treatment agent ④ back treatment agent ⑤ The main components of isolation paper pressure sensitive adhesive include rubber type and resin type.

Such as polyacrylate or polyvinyl ether two classes, the substrate requires a uniform, small scalability and good solvent infiltration, including:

• Fabrics such as cotton, glass, or non-woven fabrics.
• Plastic films, such as PE, PP, PVC, and mylar film.
• Paper such as kraft paper, transparent glass paper, etc.

The substrate roughness is between 0.1 and 0.5. The role of the underlying treatment agent is to increase the adhesive strength between the adhesive and the substrate so that the adhesive tape will not cause the adhesive and the substrate to disengage and stain the adhesive surface and make the adhesive tape reuse.

The common base treatment agent is chloroprene rubber, modified chlorinated rubber, partially vulcanized with isocyanate. The back primer is generally prepared from polyacrylate, PVC, cellulose derivatives, or organosilicon compounds. It can act as an isolation agent. Double-sided adhesive tape should be added with a layer of isolation paper such as semi-hard PVC film, PP film, or kraft paper. The pressure-sensitive adhesive does not need to warm, can be bonded with finger pressure, and is a peel-strength adhesive, its adhesion characteristics are four elements: T (fast adhesion) adhesive layer cohesion strength; K- adhesive base force is the adhesive force between the adhesive and the substrate.

Wuxi Changsheng Adhesive Products Co., LTD., the company specializes in R & D, production, and sales of pressure sensitive adhesive series products, if you need to consult, you are welcome to inquire or Email.

The growing energy crisis and environmental concerns have prompted countries to look for alternative energy sources. The automotive industry is currently undergoing significant changes. The Chinese government has been putting efforts to replace conventional fuel-powered vehicles to diminish dependence upon non-renewable energy.

Reasons for the slow volume of high-energy vehicle sales

The reasons cited for users not accepting pure electric vehicles is due to long charging time, low cruising range, and high li-ion battery replacement charge. Although lithium battery has had a significant drop in its price since 2010, the battery replacement cost is still a vital reason for consumers to avoid investing in new energy vehicles. Hence, stress is being put on how to shorten battery charging time, extend the cursing range, and reduce battery costs.

Changing battery market

Besides technological innovation, the NEV(new energy vehicles) industry is getting strong support through national policies. The local and central Chinese governments have launched numerous industrial policies to encourage healthy development as well as further improvement of the NEV battery industry. The National ‘863’ Plan has been launched in China since 2001 for NEV Major Project. It determines the technological development path of three horizontal and vertical NEV. It also clearly clarifies the growing importance and need for lithium battery development in today’s NEV industry.

New age introductions promote the increasing volume of sales

The European Union (EU) has proposed a policy of prohibition on the sale of new gasoline and diesel vehicles by 2035, and the ratio of pure electric vehicles is expected to continue under the context of a rapid shift to pure electric vehicles. The government in China has managed to implement subsidy standards and a double-point policy to encourage mileage upgrades. Such policies in place have been helping encourage Nev’s technological developments. It includes achieving sustained NEV sales and enhancing the cruising range. The trend clearly shows the growing acceptance among today’s Chinese society of new energy vehicles. By the first half of 2022, global sales of NEVs exceeded 4.22 million, an increase of 66.38% over the same period last year.

The rapid development of the Li-ion battery industry will lead to significant growth in packaging materials of Li-ion batteries

To achieve the target of “carbon neutrality” and “emission peak”, reforms in the energy and transportation industries are imperative, driving the rapid development of new energy vehicles and the photovoltaic industry chain. Li-ion batteries can not only meet the demand for miniaturization and thinness of consumer electronics but also meet the demand for high-density and large discharge multipliers in the field of power batteries and energy storage areas. The rapid development of the Li-ion battery industry will lead to the substantial growth of aluminum plastic film and diaphragm film for Li-ion batteries.

The meaning of aluminum plastic film for Li-ion battery

There are dynamic electrochemical reactions inside lithium-ion batteries, which are sensitive to water and oxygen. When these substances meet, they will react and produce a large amount of hydrofluoric acid, which will affect the capacity and cycle life of the cell. Aluminum plastic film for the li-ion battery is a key packaging material, which completely isolates the inside of the cell from the outside, avoiding the possibility of water, and oxygen contact with the electrolyte. So it has strict requirements on the barrier, cold stamping form-ability, puncture resistance, chemical stability, and insulation.

Manufacturing methods of aluminum plastic film for Li-ion battery

The manufacturing methods of aluminum plastic film can be divided into the dry method and the thermal method. The aluminum-plastic film produced by the dry method has excellent deep-drawn molding performance and anti-short circuit performance with a good appearance. But the manufacturing is complicated and not easy to operate, which is suitable for power batteries and energy storage batteries. While the aluminum plastic film of the thermal method has the advantages of good electrolyte resistance and water resistance. But its deep-drawn molding performance and anti-short circuit performance are not as good as that of the dry method. It is suitable for consumer batteries with low capacity.

Development trend of the aluminum-plastic film: the process of nationalization is accelerated

Chinese aluminum plastic film for the li-ion battery industry started relatively late. In the past, the key raw materials and production equipment basically relied on imports. In recent years, this industry got rapid development through self-development and acquisition. At present, the domestic aluminum-plastic film is mainly used in the field of medium and low-end consumer batteries. Regarding power batteries, the Shanghai Zijiang group, Selen New Materials, and other enterprises have developed into the stage of sample delivery and small-scale trial use through two years of technological breakthroughs.

Due to the limit on production expansion of Showa Denki Group and DNP printing, the hope of overseas battery manufacturers to diversify suppliers, and the rise of domestic battery manufacturers, the development of the domestic aluminum plastic film industry will be further promoted.

The function of diaphragm film for Li-ion battery

The diaphragm is an important part of the lithium-ion battery, which is located between the anode and cathode. It could not only ensures lithium ion pass by but also hinders electron transmission. Its property directly affects the battery’s discharge capacity, cycle life, and safety.

Processing technology of Li-ion battery Diaphragm

The process is divided into a wet process and a dry process. In the early development stage of new energy, dry diaphragm film is widely used in large-scale lithium iron carbonate batteries because of its high safety, low cost, and easy operation. The wet separator has obvious advantages in physical, chemical, and mechanical properties, but its thermal stability is not as good as that of the dry separator. So it is more widely used in ternary batteries. The addition of the coating process greatly improves the thermal stability and puncture resistance of the wet diaphragm, its overall performance is better than that of the dry diaphragm.

Besides, as the price difference between the dry and wet diaphragm continues to shrink, the wet diaphragm will become the mainstream of the market in the future.

The development trend of the diaphragm

In the early stage, the diaphragm was mainly used for mobile phones, computers, and other 3c fields. The market demand was not large. With the explosive growth of the new energy and energy storage market, the new energy vehicle power market has become the largest application field of lithium batteries.
Japan and South Korean lithium battery diaphragm enterprises take advantage of early advanced technology and first-mover to occupy the overseas high-end market. Although the lithium battery diaphragm started late in our country, it got rapid growth with the development of the power industry in our country. By expanding the production scale and reducing the cost, domestic lithium battery enterprises gradually enter the overseas market by virtue of price advantage and product quality.