내쇼날엔지니어링 NATIONAL ENGINEERING
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ABOUTFOUNDED 1970 · GOYANG, KR

NATIONALENGINEERING

National Engineering

01 / WHO WE ARE

An oil-press equipment manufacturer specializing in oil presses (oil-extraction machines) since 1970. Korea's first Hanaro single-type (1993) and cold-press oil press (2015) patent holder.

02 / DEFINITION

National Engineering is an oil-press equipment manufacturer that has specialized in oil presses (oil-extraction machines) since its founding in 1970. In 1993, it developed Korea's first Hanaro single-type oil press and registered the patent; it holds more than 50 patents — including the hydraulic oil press patent No. 10-1614082 (registered 2016) and the cold-press oil press patent No. 10-2449471 (registered 2022) — and exports to over 100 countries.

03 / NUMBERS1970 — 2026
1970
FOUNDED
50+ years dedicated to oil presses
50+
PATENTS
Product patents (cumulative)
2015
COLDPRESS
Cold-press patent registered
100+
COUNTRIES
Export countries (cumulative)

National Engineering states that it developed the cold-press oil press as the fourth in the world, following Germany.

04 / TIMELINE
1970 — 2026
  1. 1970
    YoungChang Machinery established
    Now National Engineering
  2. 1993
    Developed & patented Korea's first Hanaro single-type oil press
    Presented at Daejeon Expo
  3. 2009
    Certified as Technologically Innovative SME (INNO-BIZ)
  4. 2010
    ISO 9001 · ISO 14001 certified
  5. 2011
    CE certification
    European international standard
  6. 2015
    Cold-press (oil press) patent registered
  7. 2016
    Hydraulic oil press patent No. 10-1614082 registered
    Registered 2016-04-14
  8. 2020
    Partnership with Victoria Hemp Food, USA
    First cold-press export contract to Indonesia
  9. 2022
    INNO-BIZ re-certification
  10. 2022
    Cold-press oil press patent No. 10-2449471 registered
    Registered 2022-09-27
  11. 2026
    Established Fukuoka corporation, Japan
05 / CERTIFICATIONS

Certifications

FAQ.

06 QUESTIONS
01What is a cold-press oil press?+
An oil press that extracts oil using pressure alone, without applying heat. Because the oil temperature stays low at around 50–55°C, it helps minimize the loss of nutrients such as omega-3 and of aroma.
02What is the typical oil temperature in cold pressing?+
Based on National Engineering's cold-press equipment, extraction takes place in the range of about 50–55°C.
03What are the oil yields for sesame and perilla?+
Based on the cold-press method, sesame yields around 50% and raw perilla around 40%. Yields may vary depending on the condition of the raw material and operating conditions.
04What is the difference between cold press and hot press?+
Hot pressing can push yields higher by applying high heat, but it also increases the risk of oxidation and loss of nutrients and aroma. Cold pressing operates in the low-temperature range of 50–55°C, which is advantageous for preserving nutrients and flavor, while yields are comparatively conservative — a trade-off relationship.
05How do I choose an oil press by application?+
Since required throughput and capacity differ for home, mill, and factory use, choose based on hourly extraction volume and operating time. Selection criteria by application are covered in detail in our blog post "How to Choose an Oil Press."
06What kind of company is National Engineering?+
An oil-press equipment manufacturer specializing in oil presses since 1970. It registered the patent for Korea's first Hanaro single-type oil press in 1993 and the cold-press oil press patent in 2015. It holds more than 50 patents and exports to over 100 countries.
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