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Plastic-alternative labelstocks are new products developed to meet demand for deplasticzation of products.
They were created by combining Lintec's proprietary specialty paper manufacturing technology with applied adhesive technology. "Combining" them sounds simple, but progress is never so easy at the Research Center. It seems that the road of this development was not a smooth one.
Adhesive Materials Lab
Ayaka Seto
Adhesive Materials Lab
Shinya Suzuki
Technical Planning Office
Takuya Tetsumoto
* The published content was current as of the time of the interview
Tetsumoto
The need for performance meeting environmental requirements increased around 2018. I believe it was triggered by the fact that from January of that year we could no longer export resource waste to China, and that the issue of marine plastic waste became one of the main agenda items at the G20 Osaka Summit in 2019.
Suzuki
In response to this trend, brand owners and manufacturers began launching environmental initiatives in late 2019. At the time, the market was using various forms of plastic film-based labelstocks, and we felt a sense of urgency because our materials would no longer be used if this situation continued.
Seto
We were quick to respond, once we caught on to what was going on in the world. Research and development teams were immediately assembled, and Lintec's deplasticization efforts began. I think it was that speed that enabled us to launch the plastic-alternative labelstocks series before we received orders from our customers.
Tetsumoto
Lintec had a strong weapon for achieving deplasticization of products. That is the washing-resistant paper we used for cleaning tags. Development began with the prospect of applying the manufacturing technology for that paper to create labels with durability and water resistance.
Suzuki
However, even though the base technology of washing-resistant paper was available, whether it could be used immediately as a labelstock was another matter. In fact, it was quite a challenge.
Suzuki
One particular challenge was improving printability. In the case of film, the smoothness of the material allows ink to be applied cleanly and firmly when printed. Paper, on the other hand, has an uneven surface, resulting in shallow or uneven ink application.
Tetsumoto
Indeed, although the prototypes came out relatively quickly, it seemed to be quite a challenge to adjust the smoothness and coating treatments to improve printability. I remember that three or four prototypes were made.
Suzuki
The Kumagaya Plant, which was in charge of paper production, was asked to test various conditions, including the paper pressing process and fine-tuning of the printing coatings. The people on the project there worked really hard, and I am very grateful to them. In the development of plastic-alternative labelstocks, the Kumagaya plant, which is actually responsible for the paper manufacturing process, had knowledge and experience in this area, and the plant and the Research Center worked well together, which I feel was a positive factor.
Seto
One barrier for me was the design of the adhesive. Assuming the case where labels are applied to shampoo bottles, etc., certain degrees of water resistance and strength are necessary. This time, however, the adhesive was also required to be environmentally friendly, so I struggled to balance that strength with environmental friendliness.
Suzuki
At the time of development, Ms. Seto was in her first year with the company, yet she was working like a veteran. We were able to develop the product faster than we had thought, and I think it was due to Ms. Seto's hard work.
Seto
I applied prototype labels, dipped them in water, rubbed them when wet, measured the wet strength of the paper, and repeated the tests day after day. This is the first time I had been entrusted with research that I knew will become a product. I was desperate to get it into shape somehow.
Suzuki
The company also acquired Biomass Mark certification from the Japan Organics Recycling Association for the adhesive layer of the final labelstock. We were able to launch plastic-alternative labelstocks, unique labels with environmentally friendly facestock, adhesive, and release liner, in about six months after the start of development.
Tetsumoto
Their efforts paid off, and customers responded favorably. We have had many people tell us, "This is the kind of labelstock we have been waiting for." There are other paper-based labels with excellent water resistance, but it is rare to find a product with superior printability as well.
Seto
Thickness can be varied, and cellophane can be layered to enhance the design potential. It is also possible to utilize the texture of paper to convey to consumers that it is actually paper. The wide range of variations will allow us to meet the needs of a variety of customers.
Suzuki
I personally believe that environmental performance can be further enhanced, and we are currently developing materials that do not use organic solvents in the manufacturing process. Even if we use the term "environment friendly", each customer has their own approach, such as emphasizing deplasticization or recyclability. As a researcher, I would like to increase the variety of the plastic-alternative labelstocks series, so that we can respond to each vision with the right product.
Tetsumoto
It would be interesting to have a removable label that can be removed cleanly even when wet with water. Our ideas keep expanding.
Seto
Plastic-alternative labelstocks are created by combining preexisting washing-resistant paper technology with adhesive technology. Our Research Center also has a vast amount of other knowledge and technology that we have accumulated over the years. If they are combined well, we can create new generations of products like plastic-alternative labelstocks more and more in the future.