HP https://www.nittobo.co.jp/index.html

We are a manufacturer of fusible interlining and tapes, and we specialize in ladies' interlining, with a rich range of fabric bases, adhesive resins, and color variations. Its features are compatibility with a wide variety of materials and easy color matching.
HP https://www.asahi-kasei.co.jp/advance/jp/

A manufacturer that produces interlining using knitted fabric bases; knitted-fabric interlining is a unique product not found at other companies. We produce and sell interlining under the Apico brand. It is commonly used for ladies' and casual wear.
HP http://www.thermofix.co.jp/

We develop interlining, tapes, haircloth interlining, shoulder pads, and cotton pads. Although the company has a strong men's-wear image, it also receives strong support for interlining, shoulder pads, and cotton pads for women's wear and uniforms, and it was the first company to commercialize general-purpose long-fiber interlining. Regarding haircloth core, we are currently one of the few manufacturers in Japan. In terms of environmental measures, we are taking steps such as using recycled polyester and dope-dyed yarn to reduce environmental impact in the dyeing process; these are standard products.
HP http://www.takoh.co.jp/

We are a manufacturer of interlining, haircloth interlining, and pre-cut haircloth interlining, and we are one of the few haircloth interlining manufacturers.
We are a manufacturer specializing in men's wear and uniform interlining.
In addition to domestically produced haircloth cores with excellent cost performance, we also produce special yarns and premium haircloth cores by spinning and weaving at our own factory in Japan.
HP https://www.dynic.co.jp/

Under the brand "Stayflex," there is interlining and a brand called "Haronic."
In particular, we are developing a large volume of jacket collars under the "Haronic" brand, and in this area we are unmatched by other companies.
HP http://www.vilene.co.jp/

A manufacturer of nonwoven interlining; Vilene is synonymous with nonwoven interlining. It is well known in the medical field, and even in apparel, nonwoven interlining is unmatched by other companies.
HP https://www.kurasen.co.jp/

We produce nonwoven interlining for apparel under the Crambon trademark.
HP https://www.kinsen-gousen.com/

This will be a manufacturer that mainly develops shirt interlining. In addition to the viscose type, there is also a 100% cotton haircloth core for high-end shirts. Summary I found a typical example among interlining manufacturers.
Even if they are called interlining manufacturers, the products handled and areas of specialization differ from company to company. In addition, a basic lot is required for shipment from manufacturers. Also, there is no trading company that has everything; each has its own strengths. It is important to choose a trading company that matches the interlining you want to use.
I would appreciate it if this could be of reference to you.