In 1909, KIC established its first mill, the Companhia Fabricadora de Papel, which only began operating in 1914, and by the 1920s, had become one of the largest manufacturers in the sector in Brazil.

The rise of the Klabin Group began in this period, with expansion in the paper sector and diversification of business, such as the leasing of Manufatura Nacional de Porcelanas S/A in 1931.

At the time, the farm, which was located in Tibagi, was owned by a bankrupt French company that passed its assets on to the Bank of the State of Parana, with the intention of paying off its debts.

[3][13][12] Klabin started to invest in the production of rayon with the purchase of part of Rilsan Brasileira S/A[11] in 1951, and in new industrial sectors, such as the acquisition of Companhia Universal de Fosforos,[11] in 1955, in São Paulo.

[3] In 1969, the activities of the mill Papel e Celulose Catarinense (PCC) were started in Lages (Santa Catarina), focused on the production of kraft paper and softwood pulp.

[3] In 1973, production began at Papelão Ondulado do Nordeste (Ponsa), in Goiana (PE), a pioneer in the manufacture of cellulose from sugarcane bagasse.

[3] In 1979, the Samuel Klabin Ecological Park was created on the Monte Alegre Farm, with an area of approximately 11 thousand hectares, where 71% is formed by natural forests.

[3] In the following years, Kaplin adapted and modernized its administrative management, enabling the expansion of its industrial power with the multiplication of companies on national soil and several international investments.

[9][11][3] On February 14, 1980, Project IV, which aimed to modernize and expand paper production at Industrias Klabin do Parana, was officially concluded.

President João Baptista de Oliveira Figueiredo and Parana governor Ney Braga participated in the occasion, in the company of other federal, state, and municipal authorities, in Telemaco Borba.

The origin of the exsicatas comes from various regions of the Monte Alegre Farm in Telemaco Borba (76%), from other municipalities in Parana, and, to a lesser extent, from other states in Brazil.

The Frans Krajcberg Nature Interpretation Center was also created, offering a space for the development of environmental education project activities and a museum collection with zoological and botanical pieces to convey knowledge of the region's biodiversity.

[3] In July 2000, it acquired Igaras Papéis e Embalagens, a Brazilian manufacturer of paper and cardboard boxes, for 918 million reais, with three units: Otacilio Costa (Santa Catarina), Ponte Nova (Minas Gerais) and Angatuba (São Paulo).

Klabin entered a new phase of expansion and investments by announcing the purchase of land in Campina dos Pupos, in the town of Ortigueira, near Telemaco Borba.

Covering 4,987.16 hectares of remaining Atlantic Forest area, the reserve comprises the municipalities of Bocaina do Sul, Painel, Rio Rufino, Urubici, and Urupema.

The company is also a signatory of the UN Global Compact and the National Pact for the Eradication of Slave Labor, seeking suppliers and business partners that follow the same values of ethics, transparency, and respect for the principles of sustainability.

[26][3] In 2018, Klabin announced the acquisition of 12.5% of Israeli startup Melodea Bio Based Solutions,[27] targeting nanocrystalline cellulose (CNC) extraction technology.

The units located in Suzano, Franco da Rocha and Paulínia (São Paulo); Manaus (Amazonas) and Rio Verde (Goiás) were acquired.

[47] In February 2021 the National Bank for Economic and Social Development (BNDES) sold on the stock exchange 21 million units of Klabin, which represented about 25% of its stake in the company's capital.

In 2018, Telemaco Borba was the largest generator of wealth from forestry in Brazil, presenting the highest value of production in the country, with 326.9 million reais.