四国化工 List of Products and Services

In the morning, I take bread and rice balls, and at night, I put the vegetables and meat I bought at the supermarket into the refrigerator. During that time, there are hardly any days when I don't see food packaging film. On the other hand, perhaps because it is a petroleum product, I sometimes hear questions like, "Is food packaging film really necessary?" However, food packaging film is a "social infrastructure" that supports modern eating habits. Let's understand the overall role of food packaging film together with polymer chemistry seminar students.

• plastic
• Other polymer materials

Defective packaging film may be silently robbing your company of profits as an "invisible cost." Invisible costs refer to expenses that are not immediately apparent but are definitely incurred, such as re-packaging defective products, disposal, and the labor and time spent on these tasks. Just imagine. The products you worked hard to create are being re-packaged due to film defects... Every time you dispose of defective products, the material costs and production costs go down the drain... You are overwhelmed with inspection tasks and cannot attend to other important operations... All of these can accumulate and become a significant burden on your management. Any concerns you have regarding film, no matter how small, are welcome. Please feel free to consult with us first. We will propose the optimal solution for you.

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Biomass plastic is a type of plastic made from renewable biomass resources. Specifically, it is derived from plant-based materials such as corn and sugarcane, and the carbon dioxide (CO2) emitted during combustion is absorbed through photosynthesis during the growth process of the plants, enabling carbon neutrality and promoting research and development as a measure against global warming. Shikoku Chemical has been supplying clean films utilizing co-extrusion multilayer technology for semiconductors and electronic components. Recently, we have successfully developed the world's first environmentally friendly biomass clean film, which combines the traditional high cleanliness with the environmental added value of biomass【*According to our research as of July 2025】.

• plastic
• Other polymer materials

CANS is a food packaging film from Shikoku Chemical. It embodies the idea of "creating a plastic packaging container stronger than a can" through co-extrusion multilayer technology. By simultaneously extruding resins with various functions to create multilayers, we can achieve film properties that cannot be realized with single-layer films. Additionally, it allows for product design that considers the user's perspective, making it lightweight, easy to open, easy to handle, and convenient for disposal after use.

• Other polymer materials
• plastic

A film made by overlapping two or more types of films is called a multilayer film. There are two main manufacturing methods: co-extrusion and lamination. Why are multilayer films necessary in the first place? What are the differences between the two types of multilayer films? Can multilayer films be recycled? Let's focus on the characteristics of each and understand the overall framework together with polymer chemistry seminar students.

• plastic

Plastic film is one of the most familiar polymer materials, defined by JIS standards as "a plastic film with a thickness of less than 0.25 mm." There are no strict rules, but it also has a soft and flexible image. What is plastic film? Let's understand the broad outline of its manufacturing methods, raw materials, and environmental aspects together with students from the polymer chemistry seminar.

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"Pradan." It is an abbreviation for plastic cardboard made from plastic rather than paper. Regular pradan is made from polypropylene (PP) and functions as lightweight and high-strength boards or sheets by adopting a hollow structure with a liner and core. Pradan cases are primarily used as "transport boxes" because they are superior in strength and durability compared to paper cardboard boxes. Now, are you familiar with "single-sided pradan"? Unlike regular pradan, it is made from polyethylene (PE), which is softer than PP, and has a liner on only one side. Therefore, the biggest feature of single-sided pradan is that it is "flexibly bendable," exhibiting unique functions that differ from regular pradan.

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Since its founding, Shikoku Chemical has continuously created films for the future. Our unwavering pursuit of high quality and commitment to the development and research of new technologies remain deeply rooted within us. We have the reliable technology to pursue new possibilities, asking, "Is it possible to create such films, functions, or manufacturing methods?" We provide original custom-made films that meet our customers' demands, including the development of entirely new materials, functions, and manufacturing methods.

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Co-extruded multilayer film is formed by melting different types of resins and layering them within a mold to create a single film. By designing the types of resins and their composition ratios, it is possible to impart various functions to a single film, such as heat sealability, flexibility, heat resistance, cold resistance, pinhole resistance, and gas barrier properties, according to the customer's required performance.

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The Sustainable Development Goals (SDGs) consist of 17 goals shared by the international community, including the eradication of poverty and the protection of the Earth's environment. Among these, "Goal 12: Responsible Consumption and Production" is directly related to the reduction of food loss. Specifically, it aims to halve per capita global food waste at the retail and consumer levels by 2030 and to reduce food losses along production and supply chains. Here are three initiatives by Shikoku Chemical to reduce food loss.

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A pinhole refers to a small hole or defect that is barely visible or not visible at all, created in a container. These pinholes can occur due to physical causes from the outside or the contents during the manufacturing process, transportation, or use. The causes of pinhole formation can be broadly categorized into three types. Measures corresponding to each type are necessary, but Shikoku Chemical's co-extruded multilayer film is effective against all three types of pinhole issues. We have compiled a scientific column explaining why co-extruded multilayer films are resistant to pinholes, so please take a moment to read it. Additionally, we have also created a popular "slow-motion video." We would appreciate it if you could take a look at that as well.

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■Background of the Issue At the time when CRT televisions were mainstream, the emergence of LCD televisions led various home appliance manufacturers to experiment with packaging forms for modules. Each company was devising its own unique packaging form, but the required performance characteristics of the packaging materials were mainly as follows: ◎ Anti-static functionality was necessary as an ESD countermeasure ◎ The television screen should not become dirty ◎ The packaging should not contain metal ions that could cause defects in the product Additionally, since the assembly locations for the products were overseas and shipping was done by sea, it was necessary to consider the effects of exposure to high temperatures and humidity during transport. ■Solution To enable safer and more secure packaging of LCD modules, we developed an anti-static film that is low in contamination and does not contain metal ions. The film also has sufficient strength to prevent tearing during transport. Furthermore, since wide bags of approximately 1000mm in width are required for module packaging, our wide film production technology makes this possible.

• Other polymer materials

■Background of the Issue In the past, we have heard from customers in the meat industry that "transporting fresh meat in a chilled state adds more value than freezing it." On the other hand, we also received regretful feedback that "spare ribs, which are such a delicious cut, cannot be transported in a chilled state due to sharp bones, forcing us to rely on frozen distribution and compromising their taste." ■Solution By leveraging the mechanical properties, optical properties, and gas barrier properties inherent in plastics, and by reducing thickness to minimize volume, we were able to create an environmentally friendly product. As a result, we achieved zero market complaints for pinholes that could not be prevented with a thickness of 200μm, even at less than 100μm, allowing delicious spare ribs to be delivered to consumers just as they are. Of course, this also provided our customers with the benefit of increased unit prices.

• Other polymer materials

Plastics have achieved remarkable development not only due to advances in polymer chemistry but also through advancements in plastic molding technology. We have received many requests to deepen the understanding of our core technology, "co-extrusion multilayer film molding," within the molding technology, and we have started a commentary column, so please take a look. ■Column Articles Vol.01 First Day of Assignment: What is Extrusion Molding? Vol.02 Basics of Co-Extrusion: What Changes with Cooling Differences? Vol.03 Basics of Co-Extrusion: Functions of Resins Vol.04 Basics of Co-Extrusion: Role of Additives Vol.05 Basics of Co-Extrusion: From Film to Bags Vol.06 Basics of Co-Extrusion: Food Packaging Film CANS Vol.07 Manufacturing Equipment: Extruder Vol.08 Manufacturing Equipment: Die Section (Part 1) Vol.09 Manufacturing Equipment: Die (Part 2) Vol.10 Manufacturing Equipment: Cooling Device Section *For more details, please refer to the related links below.

• Other polymer materials

■Product Features (1) Compatible with various sterilization methods This packaging is suitable for high-pressure steam sterilization, dry heat sterilization, and ethylene oxide gas sterilization, particularly among various sterilization methods. (2) Highly rated film for liquids It can accommodate a wide range of liquid medications and waste, from infusion solutions to high-calorie infusion formulations and waste liquids. (3) Compliance with pharmacopeia We can provide packaging developed in collaboration that meets the pharmacopeial tests tailored to customer needs. (4) Endotoxin-free packaging There are examples of packaging that can be handled in sterile rooms. (5) Reliable trust from pharmaceutical manufacturers We can respond quickly to inquiries and consultations beyond the specifications agreed upon. (6) Strict quality control modeled after the medical industry By managing all processes of production, sales, and maintenance, the quality is unified to an extremely high standard.

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■Product Overview This is a polyethylene material corrugated product, the only one of its kind in Japan. It excels in oil resistance, water resistance, cushioning, and elasticity. Utilizing these properties, it is used for protecting printing plates and as export packaging materials, and recently its use has expanded to seedling applications. ■Product Features (1) Easy-to-use sheet-like packaging material regardless of the shape of the packaged item Made of polyethylene, it is soft and has excellent cushioning properties. In particular, its single-sided corrugated shape makes it ideal for cylindrical packaging specifications. (2) Unique applications brought by the "wavy shape" Utilizing the unevenness of the wavy shape, there are examples of its use in preventing root wrapping for forest seedlings and as a substitute for trays for wire materials. ■Specifications Main applications: Envelope cushioning material / Heavy item exterior material / Food interior material / Electronic component packaging material / Seedling containers Material: Polyethylene Weight per unit area (g/m²): 200 to 1,000 Length (mm): Endless (standard: 50m roll) Maximum width (mm): 1400

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■Product Overview PTS is a self-adhesive type that does not use adhesive (glue), unlike typical surface protection films, making it a self-adhesive protective film that does not leave glue residue on the substrate. ■Product Features (1) Self-adhesive design that does not leave glue residue upon removal (2) Prevents scratches during transportation (3) Product design that covers up to high cleanliness (4) Free from environmentally harmful chemicals ■Specifications Main Applications: Glossy molded products / LCD display materials / Glossy molded dashboard components / Piano black coatings Layer Composition: 3 layers (PE / PE / EVA) Standard Product Sizes Thickness: 40μm to 50μm Width: 100mm to 500mm

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■Product Overview This is a clean film with a three-layer structure that includes a foamed polyethylene layer in the intermediate layer. The shock-absorbing effect of the foamed polyethylene layer protects the contents from mechanical impacts. Using low ion contamination and low outgassing materials developed over many years of research reduces contamination to contact items. It is effective in preventing scratches when used as interleaving paper between acrylic and other resin sheets or glass sheets. ■Product Features (1) Achieves cleanliness and cushioning by foaming the intermediate layer (2) Ideal for preventing scratches when used as interleaving paper between acrylic and other resin sheets or glass (3) Free from environmentally harmful chemicals (4) Achieves low ion contamination and low outgassing ■Specifications Main Applications: Glossy molded products / LCD display materials Layer Composition: 3 layers (PE / PE (foamed) / PE) Standard Product Size Thickness: 120μm Width: 100mm to 500mm

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■Product Overview General types of surfactants have been problematic due to contamination of contents from bleed-out and variability in static electricity prevention effects depending on the usage environment (especially during dry conditions). HA-V addresses this issue with cutting-edge polymer-type antistatic agents, providing high cleanliness and stable antistatic effects. It is the ultimate clean antistatic film that combines the technology of APTCLEAN film, which prevents contamination of contents from bleed-out, and the technology of APTSTAT film, which repels dust and dirt with stable antistatic effects. ■Product Features (1) Product design that covers high cleanliness (2) Semi-permanent antistatic effect (3) Stable antistatic performance (4) Excellent strength and durability (5) Free from environmentally harmful chemicals ■Specifications Main Applications: Printed Circuit Boards / LCD Displays / Modules / HDD Components Layer Composition: 3 layers (PE / PE / PE) Standard Product Sizes Thickness: 35μm to 100μm Width: 200mm to 1000mm

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■Product Overview This is a film made by kneading a surfactant into polyethylene and forming a film. The surfactant attracts moisture from the atmosphere, creating a moisture film (conductive) on the film's surface, which provides an anti-static effect. ■Product Features (1) Stable anti-static performance (2) No environmentally harmful chemicals used (3) Prevention of dust adhesion due to static electricity ■Specifications Main applications: Printed circuit boards / Liquid crystal displays / Modules Layer composition: Single layer (PE) Standard product sizes Thickness: 50μm to 100μm Width: 50mm to 1500mm

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■Product Overview This film is developed for food products with sharp protrusions, such as those containing bones or shells, as well as frozen foods. It has more than twice the puncture resistance compared to standard vacuum packaging films of the same thickness. By reducing food loss caused by pinhole formation, it contributes to cost savings. ■Product Features (1) Overwhelming puncture resistance, ensuring safety even with sharp contents (2) Preserves the fresh aroma of food (3) Good label adhesion ■Specifications Main Applications: Livestock sector / Aquaculture sector / Others Temperature Range: -40℃ to 100℃ Layer Composition: 5 layers (PBT / Adhesive resin / Nylon / Adhesive resin / L-LDPE) Standard Product Sizes Thickness: 80μm / 110μm Width: 150mm to 550mm

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■Product Overview By incorporating an anti-static function in the inner layer, the opening performance of automatic bagging machines is improved, and the adhesion of contents (powder products) due to static electricity is reduced. ■Product Features (1) Reduction of film adhesion for powder products due to anti-static function (2) Excellent pinhole resistance suitable for frozen distribution (3) High mechanical suitability that prevents curling of the opening, enhancing productivity (4) Good label adhesion (5) Retains the fresh aroma of food ■Specifications Main Applications: Powdered items such as spices/additives Temperature Range: -40℃ to 100℃ Layer Structure: 5 layers (PBT / Adhesive Resin / Nylon / Adhesive Resin / L-LDPE) Standard Product Sizes Thickness: 60μm / 70μm / 80μm / 100μm Width: 100mm to 600mm

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■Product Overview This film utilizes a special polyethylene resin in its inner layer, which provides excellent sealing properties at low temperatures. It is designed to allow sealing even when bags are stacked, taking advantage of the melting point difference between the resins in the inner and outer layers. Additionally, it possesses the cold resistance pinhole characteristics of CS-H, and by adopting the special polyethylene resin, the film's flexibility has been enhanced, improving its pinhole resistance compared to CS-H. These two features make it suitable for vacuum packaging of chilled pork products. ■Product Features (1) Can seal even when bags are stacked (2) Pinhole resistance suitable for frozen distribution (3) Preserves the fresh aroma of food (4) Reduces drip spread, enhancing appearance (5) Good label adhesion ■Specifications Main Applications: Processed meat products (refrigerated/frozen) / Processed seafood (refrigerated/frozen) / Others (refrigerated/frozen) Temperature Range: -40℃ to 100℃ Layer Composition: 5 layers (PBT / Adhesive resin / Nylon / Adhesive resin / Special L-LDPE) Standard Product Sizes Thickness: 50μm / 60μm / 70μm / 80μm / 100μm / 120μm Width: 100mm to 550mm

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■Product Overview This is a three-layer structure made of nylon resin and polyethylene resin, featuring oxygen barrier properties, high strength, and heat resistance, serving as the basic composition for vacuum packaging films. It offers excellent cost performance with a minimal number of layers in the vacuum packaging bags. ■Product Features (1) Solid performance with a simple structure, providing excellent cost performance (2) Outstanding gloss and transparency! Good appearance of contents ■Specifications Main applications: Processed meat products (refrigerated) / Processed seafood products (refrigerated) / Others (refrigerated) Temperature range: -30℃ to 100℃ Layer composition: 3 layers (Nylon / Adhesive resin / L-LDPE) Standard product sizes Thickness: 60μm / 70μm / 80μm / 100μm / 120μm Width: 80mm to 300mm

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■Product Overview PBT resin excels in transparency, glossiness, and aroma retention, and when used as the outermost layer, it protects the strong NY layer and provides resistance to pinholes. Additionally, it is a film suitable for automatic bagging machines as it does not curl. This versatile film can be widely used across various fields, from food to industrial and electronics. We offer a wide range of products, allowing for various contents and applications. ■Product Features (1) Excellent pinhole resistance suitable for frozen distribution (2) High mechanical suitability with no curling at the opening, improving productivity (3) Retains the fresh aroma of food (4) Good label adhesion ■Specifications Main Applications: Processed meat products (refrigerated/frozen) / Processed seafood (refrigerated/frozen) / Others (refrigerated/frozen) Temperature Range: -40℃ to 100℃ Layer Structure: 5 layers (PBT / Adhesive resin / Nylon / Adhesive resin / L-LDPE) Standard Product Sizes Thickness: 60μm / 70μm / 80μm / 100μm / 120μm Width: 100mm to 600mm

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■Product Overview Barrier 7 is composed of 7 layers of film. Utilizing the properties of EVOH resin and NY resin, it achieves barrier performance and high strength. It is ideal for applications requiring high oxygen barrier properties, such as packaging for easily oxidizable foods and gas replacement packaging. The innermost layer uses low melting point L-LDPE, allowing for low-temperature sealing and sealing even when bags are stacked. ■Product Features (1) The effect of the EVOH layer enables long-term storage and extended shelf life of food. (2) Sealing is possible even when bags are stacked. (3) Reduces the spread of drips, improving appearance. (4) Preserves the fresh aroma of food. (5) Good label adhesion. ■Specifications Main Applications: Processed meat products / Seafood sector / Others Temperature Range: -40°C to 100°C Layer Composition: 7 layers (PBT / Adhesive resin / Nylon / EVOH / Nylon / Adhesive resin / Special L-LDPE) Standard Product Sizes Thickness: 50μm / 60μm / 70μm / 80μm / 100μm / 120μm Width: 140mm to 550mm

• plastic