What 株式会社サカイ does

株式会社サカイ (Sakai Corporation) is a Japanese specialty manufacturer of paper tubes, plastic tubes, and protective packaging materials, headquartered in Fukuyama City, Hiroshima Prefecture, and founded in 1951 by Sakai Musashi. The company operates five production facilities — three in Fukuyama (Headquarters Factory 1, 2, 3 in the Matsuhama-machi area), one in Yakage-cho, Okayama Prefecture (established 2009, expanded 2020), and one in Hofu, Yamaguchi Prefecture (established 1998). Its product portfolio centers on spiral paper tubes manufactured using automatic spiral winding machines, available in inner diameters from 18mm to 1000mm, thicknesses from 0.5mm to 20mm, and lengths up to 5000mm; complementary lines include seamless resin-coated paper tubes for premium film winding, ABS/PP/PVC/PS plastic tubes, FRP cores (precision roundness 0.15mm), paper angles (corner protectors), laminated paper up to 2100mm width, paper bobbins/reels, side caps, and tire-specific paper tubes. The underlying technology stack is mechanical (spiral winding, slitting, NC cutting, resin coating, lamination) rather than software-based.

The business operates as a B2B direct-sales manufacturer with a quote-based pricing model, supplying industrial manufacturers across multiple end-markets including film winding, electronics (IC adhesive tape), pharmaceutical and optical film packaging, tire manufacturing, construction, and food packaging. Distribution is conducted directly to enterprise buyers with no disclosed channel partner or distributor network; the company's marketing footprint is limited to its corporate website (shikan-sakai.com) and an Instagram account. Eco Action 21 environmental certification was obtained in 2007. Capital stands at ¥50 million and the company is privately held under current President Inoue Susumu (appointed 2021), the first non-family President since 1992. No revenue, no external funding, and no customer logos are publicly disclosed.

Name

株式会社サカイ

Legal name

株式会社サカイ

Website

https://shikan-sakai.com

Company type

Private

Founded year

1951

Operating status

Operating

Headcount range

1–10 employees

Short description

株式会社サカイ (Sakai Corporation) is a 75-year-old Japanese B2B manufacturer specializing in spiral paper tubes, seamless paper tubes, plastic/FRP tubes, and protective packaging materials, operating five factories across Hiroshima, Okayama, and Yamaguchi prefectures to serve industrial buyers in film, electronics, tire, and packaging sectors.

Ownership category

akta.pro rank

Product category

Industrial Paper Tube Manufacturing

NAICS

Paper Manufacturing (322), Plastics Pipe, Pipe Fitting, and Unlaminated Profile Shape Manufacturing (32612)

SIC

Paperboard Containers & Boxes (2650), Plastics Products, Nec (3089)

akta.pro primary industry

Industrial & Heavy-Duty Flexible Packaging (Construction, Chemicals, Liners) (IMALABAJ)

Keywords

• Paper tube manufacturing
• Industrial packaging cores
• Spiral wound tubes
• Protective packaging materials
• Custom paper products

Headquarters

HQ city

Fukuyama (福山市)

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Technology or R&D, Marketing or Sales

Distribution channels1 record

Marketing channels2 records

Core offering

株式会社サカイ manufactures and sells spiral paper tubes (inner diameter 18φ to 1000φ, lengths up to 5000mm), seamless resin-coated paper tubes, ABS/plastic pipes, FRP cores, paper angles, laminated paper, bobbins/reels, tire paper tubes, and side caps. The company produces custom-made industrial cores and protective packaging materials from three factory locations in Hiroshima, Okayama, and Yamaguchi prefectures, serving industrial customers in film, electronics, tire, construction, and packaging sectors.

Product overview

株式会社サカイ (Sakai Corporation) is a specialized manufacturer of paper tubes and protective packaging materials based in Fukuyama, Hiroshima Prefecture, Japan. With over 75 years of manufacturing history since 1951, the company operates three production facilities (Fukuyama headquarters, Okayama factory, Yamaguchi factory) to serve diverse industrial sectors. The product portfolio centers on spiral paper tubes and extends to complementary product lines: seamless paper tubes (resin-coated for premium film applications), paper-based protective solutions including paper angles (corner protectors) and side caps, plastic alternatives such as ABS/PP/PVC/PS tubes and FRP cores, winding solutions including paper bobbins and reels, and specialized products like tire paper tubes for beat spinners and protectors. Additional offerings include laminated paper (합紙) for multi-layer applications and various packaging materials. The company emphasizes custom manufacturing capabilities with flexible production runs, diverse processing options (cutting, notching, embossing, waterproofing), and environmental considerations including recyclability and eco-certification.

Differentiator

Problem solved

Functional benefit

Products and services

• Spiral Paper Tube (スパイラル紙管) Spiral-wound paper tube manufactured with automatic spiral machines. Available in inner diameters from 18φ to 1000φ, thicknesses 0.5mm to 20mm, and lengths from 5mm to 5000mm. Supports various processing including slitting, mouth crimping, bending, chamfering, notching, printing, embossing, cushion paper surface treatment, and thread groove processing. Used for tape (masking tape, craft tape), film, bobbin, winding, containers, packaging, reinforcement, building materials, yarn winding, interior, and food packaging applications.
• Paper Angle (ペーパーアングル) Paper-based protective corner material with high compression and pressure resistance. Lightweight and easy to handle. Recyclable as regenerated paper after use. Available in equal and unequal leg angles with custom length combinations. V-cut processing available for curved surfaces. Can be finished with waterproof coating or overlap specification with paper-covered edges. Applications include pallet packaging top protection, film roll side protection, container corner protection, and cargo corner protection.
• ABS Pipe / Plastic Pipe (ABS管・プラスチック管) Plastic tubes offering excellent weather resistance, heat resistance, and chemical resistance. Handles PE, PP, PVC, and PS materials. Features superior edge finishing precision, dimensional accuracy, roundness, and surface smoothness. Available inner diameters: 3, 6, 8 inches. Length: 300mm to 2000mm. Applications include pharmaceutical packaging film, optical film, IC-related adhesive tape, and cores requiring surface smoothness exceeding paper tubes.
• Seamless Paper Tube (シームレス紙管) Seamless paper tube with special resin surface treatment that eliminates spiral ridges. Designed for winding premium films. Manufactured in 3-inch and 6-inch diameters. Used where surface smoothness and absence of winding artifacts are critical.
• Bobbin / Reel (ボビン・リール) Paper-based bobbins and reels enabling reuse. Customizable side pad thickness and size, tube wall thickness, pad and tube materials and colors. Metal or plastic plugs and paper/plastic caps available for added strength. Supports small-lot orders with short delivery times. Applications include string bobbin, welding rod bobbin, industrial belt bobbin, commercial ribbon bobbin, rubber bobbin, and cable bobbin.
• FRP Core (FRPコア) Fiber Reinforced Plastic core with excellent weather resistance, heat resistance, and chemical resistance. Surface repairable for recycling. Lightweight with robust strength. Optional rubber coating for soft finish and static electricity removal. Precision: roundness 0.15mm, cylindricity 0.2mm, inner diameter ±0.15mm, outer diameter ±0.15mm, length ±0.5mm, surface roughness Ra0.3-1.6μm. Inner diameter: 6 inches; length: 300mm to 1680mm.
• Laminated Paper (合紙) Multi-layer laminated paper with customizable dimensions and thickness. Can incorporate film and aluminum foil. Features high compression strength, available in punching (max 1500mm×1500mm), cutting (max 1570mm×1570mm), and slitter processing (max 2400mm×6000mm). Paper width up to 2100mm. Easier processing with less material loss compared to plywood. Incinerable after use. Available for spiral and flat-wound applications.
• Tire Paper Tube (タイヤ用紙管) Paper tubes for tire manufacturing including beat spinner and beat protector products. Beat spinner prevents tire deformation with easy operation, paper material that won't damage products, no mold costs, lightweight with no installation tools needed, and easy incineration after use. Beat protector offers lower cost, paper material preventing product damage, easy size customization without mold costs, optional coloring, lightweight and easy handling, with special resin coating for enhanced strength and water resistance.
• Side Cap / S.C (サイドキャップ) Paper caps for protecting film master rolls during storage and transportation. Manufactured with sewing or adhesive processing for lightweight yet strong construction. Easy handling and opening, simple disposal. Customizable based on application and specifications.

Quantifiable outcome

• Inner diameter range from 18φ to 1000φ (spiral paper tubes)
• +3 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Smurfit Kappa Group: Global leader in corrugated and paper-based packaging with a broad industrial customer base. Adjacent to Sakai's laminated paper and protective paper packaging lines, though its core business is corrugated boxes rather than spiral tubes.
• Cascades Inc. North American manufacturer of recycled paper and packaging products including protective packaging formats. Comparable in product philosophy (recycled paper-based protective products) to Sakai's Eco Action 21-aligned paper angles and side caps.
• Pactiv Evergreen Inc. North American producer of fresh and protective paper and plastic packaging. Relevant as a broad incumbent supplying comparable industrial protective packaging formats, though not specializing in paper tubes or cores.
• Mondi plc: Global integrated paper and packaging group producing corrugated, flexible, and industrial paper packaging. Overlaps with Sakai in industrial and protective paper-based packaging, but operates at vastly larger scale across a broader portfolio.
• International Paper Company: One of the largest global pulp, paper, and packaging producers with a substantial industrial packaging segment. Competes in the same downstream markets as Sakai but as part of a much wider portfolio.

Direct peers

• Greif Inc: Industrial packaging producer including paper cores, tubes, and reels for film, tape, and converting industries. Directly comparable product portfolio to Sakai's spiral and seamless paper tubes, with overlap in winding-core applications.
• Sonoco Products Company: Global manufacturer of paper cores, tubes, and protective packaging serving industrial, film, tape, and textile customers. Closest direct peer to Sakai's spiral paper tube and bobbin/reel product lines, though at vastly larger global scale.
• 日本紙管工業株式会社 (Nihon Shikan Kogyo): Japanese paper tube and paper core manufacturer serving industrial winding, packaging, and construction applications. Directly competes with Sakai in spiral paper tubes, paper angles, and protective paper packaging in the Japanese market.
• コアレックス信栄株式会社 (Corex Shinei Co., Ltd.): Japanese manufacturer specializing in paper tubes, paper cores, and converted paper packaging for film, tape, and industrial customers. Most directly comparable Japanese competitor to Sakai's spiral and seamless tube lines.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/shikan_sakai/?hl=ja
• LinkedInlinkedin.com/company/%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE%E3%82%B5%E3%82%AB%E3%82%A4

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 株式会社サカイ