We have established an ultrafine injection molding technology using plastic injection molding. We can achieve fine shapes that were previously considered impossible with conventional molding, all without laser processing or post-processing, using only injection molding.
We apply micro injection molding technology for various purposes, including the development of fine needles. We are capable of molding not only general-purpose resins such as PP (polypropylene) and PC (polycarbonate), but also biodegradable resins like PLA (polylactic acid) and PGA (polyglycolic acid), as well as medical-grade materials. If you have a specific resin in mind, we are also willing to undertake molding using that material. Please feel free to consult with us at your convenience.
We have successfully achieved insertion into artificial skin with needles thinner than human hair using biodegradable resins. Please watch the video below to see the insertion process.
There are several methods for creating hollow microneedles from plastic. While casting is an example utilized by other companies, we are capable of producing with higher precision and mass production advantages through injection molding.
Injection molding involves melting the resin material and injecting it into a mold under pressure, then cooling it to solidify. Casting involves dissolving the material in a solvent, pouring it into a mold, and then evaporating the solvent to solidify it.
Casting offers the advantage of inexpensive molds and easy material filling, allowing for a convenient start with minimal initial investment. While useful for prototyping, it is not suitable for mass production due to the long hours of evaporation required and the large space needed for product resting.
Despite the clear advantages of injection molding, there are reasons why it is not commonplace.
One of our strengths is our advanced technical expertise in injection molding, allowing us to design products with mass production in mind from the prototyping stage.
Compared to metals and general-purpose resins, it offers higher safety.
The substance itself is not harmful, and even if it remains in the body, it gradually dissolves and exits the body.
Environmentally friendly (no waste disposal issues, etc.)
It can solve waste disposal issues because it is decomposed by microorganisms.
By selecting plant-based materials, you can contribute to CO2 reduction when using them.
During the production of raw materials, photosynthesis by plants significantly contributes to CO2 reduction.
Capable of Molding Hollow Needles Thinner than Metal
By making it thinner, we can reduce pain and lighten the burden on the user. (Image: Comparison with hair)
Through Micro Injection Molding, it is possible to not only achieve precision but also to finish the surface smoothly, enabling low-cost mass production.
WATSON
Grid lines are in the groove form.
Glass
Grid lines are rough.
Other Companies
Grid lines are convex.
In the left photo of the micro injection molded product and the glass-cut product, you can see a significant difference in the surface finish of the products. Additionally, in the case of plastic products from other companies, the grid lines are raised. The straightness and smoothness of the grid are superior to glass, making it easier to see fine details and preventing cells from getting caught. This enables the production of high-quality products such as cell counters and microscales.
By bonding plates with finely grooved channels using surface modification techniques, it is possible to create sealed microfluidic chips without the need for heat or adhesives. This eliminates concerns about deformation of fine shapes due to heat, leakage of adhesive into the channels, and leaching of adhesive components. Applications such as localized drug reactions with cultured cells or biological tissues are expected.
Please feel free to inquire about “Customization, Development, Technology, OEM” consultation here!