OSAKA SEALING PRINTING CO., LTD. (Headquarters: Tennoji-ku, Osaka City; President: Matsuguchi Tadashi), a member of the OSP Group, is pleased to announce that it has established a production system in July 2023 and has begun selling "curved surface labels."

This product is a curved surface label that can be firmly attached to cylindrical containers with small diameters such as test tubes and Spitz tubes. It uses an adhesive that has enough adhesive power to adhere cleanly to polyolefin, which is considered difficult to stick to, and has high retention power to keep the label attached. While the strong adhesive allows for a firm attachment, the low tack strength allows the label to be easily removed immediately after application. The labels are available in three types of materials: synthetic thermal paper, cast coated paper, and thermal paper.

■ Development Background

Labels for cylindrical containers such as test tubes and Spitz tubes used in medical settings often use general-purpose strong adhesive label base paper. However, when a straight label is applied to a curved surface, the repulsive force that tries to return the label to its original shape acts on the label, which can cause the label to lift or peel off. The curved repulsive force is even more likely to cause problems with stiff, stiff surface paper. Sometimes, measures such as applying tape over the label are taken, so we began developing a dedicated label to solve these issues. The product was commercialized using Osaka Sealing Printing's coating technology, which combines the base paper and adhesive. It can be used safely on a wide range of adherends, including materials and container diameters.

■ Evaluation of adhesion promotion

Accelerated testing involved attaching the labels to Spitz tubes made of different materials such as polypropylene and polystyrene and leaving them at 70°C for a week, and as a result, there was no lifting or peeling of the label base paper. In addition, there was no lifting due to outgassing from the plastic, so the labels can be used on a variety of substrates.

■ OSAKA SEALING PRINTING CO., LTD. Company Profile

• Company name: OSAKA SEALING PRINTING CO., LTD.

• Address: 1-8 Obasecho-ku, Osaka City, Osaka Prefecture

• Representative: Matsuguchi Tadashi

• Founded: 1927

• Business description: Manufacturing and sales of stickers, labels, film products, Carton Package, and sales of labeling systems

• URL: https://www.osp.co.jp/

■OSP Holdings Company Profile

• Company name: OSP HOLDINGS CO., LTD.

• Address: 6-8 Ajihara Honmachi Tennoji-ku, Osaka City, Osaka Prefecture

• Representative: Matsuguchi Tadashi

• Founded: 1969

• Business description: Business planning and management of the corporate group and related operations

• URL: https://www.osp-group.jp

Founded in 1927, the OSP Group is a comprehensive packaging company with a total of 15 companies (9 domestic and 6 overseas), and has 18 production bases nationwide to fulfill its mission of social infrastructure, mainly food distribution. Since its founding, the company has expanded its business scope in response to changes in the times, such as customer needs and the social environment. Currently, the company provides products and services that enrich society and the lives of customers through the planning, design, and manufacturing of stickers and labels, Carton Package, and promotional materials. In order to achieve high quality and stable supply, the group also operates in a wide range of areas, from material procurement, development and manufacturing of sticker and label printing base paper and printing peripherals, to designing and research and development of labeling systems.