Polymeric members and methods for marking polymeric members
View Patent ↗Generally, polymeric members and laser marking methods for producing visible marks on polymeric members, such as on thin and/or curved surfaces. The laser marking methods can include methods of laser marking straws with the step of matching laser source properties to the properties of straws being marked or with the step of laser marking straws having photochromic dyes.
1. A straw comprising:
an axial body defining an axial passage between a pair of body ends, the axial body comprising a polymeric matrix and having an exterior surface, an interior surface and a thickness between the exterior surface and the interior surface, wherein the thickness between the exterior surface and the interior surface is between about 0.1 mm and about 0.2 mm;
a photochromic dye having a maximum electromagnetic radiation absorbance wavelength or a local maximum electromagnetic radiation absorbance wavelength; and
a laser etched mark on the exterior surface of the axial body, the laser etched mark being made with a laser having a wavelength matched to the maximum electromagnetic radiation absorbance wavelength or the local maximum electromagnetic radiation absorbance wavelength of the photochromic dye in a straw, wherein the laser etched mark modifies the surface depth and color of the exterior surface of the straw and wherein the straw remains unwarped and impermeable.
2. The straw as described in claim 1 , wherein the straw contains a biological material selected from the group consisting of: an amount of semen, an ova, ovum, an enucleated cell, a plurality of sperm cells, an embryo, a plurality of sex-selected sperm cells, a sex-selected embryo, a pathogen, a bacteria, and a virus.
3. A straw comprising:
a. an axial body defining an axial passage between a pair of body ends, the axial body having an exterior surface and being formed from a polymeric matrix including a photochromic dye;
b. the photochromic dye selected to change the color in visible light and/or ultraviolet light, the photochromic dye having a maximum electromagnetic radiation absorbance wavelength or a local maximum electromagnetic radiation absorbance wavelength; and
c. a laser etched mark on the exterior surface of the axial body, wherein the laser etched mark modifies the surface depth and color of the exterior surface of the straw and wherein the polymeric member remains unwarped and impermeable, and wherein the wavelength of a laser used to produce the laser etched mark is matched to the maximum electromagnetic radiation absorbance wavelength or local maximum electromagnetic radiation absorbance wavelength of the photochromic dye.
4. The straw as described in claim 3 wherein the straw contains a biological material selected from the group consisting of: an amount of semen, an ova, ovum, an enucleated cell, a plurality of sperm cells, an embryo, a plurality of sex-selected sperm cells, a sex-selected embryo, a pathogen, a bacteria, and a virus.
5. The straw described in claim 3 wherein the straw has a wall thickness between about 0.1 mm and 0.2 mm.
6. The straw described in claim 3 wherein the photochromic dye has an activated state and an inactivated state, and wherein light in the visible or ultra violet spectra activate the photochromic dye and change the color of the straw.
7. The straw described in claim 3 wherein the polymeric matrix of the polymeric member is selected from the group consisting of: a polyvinyl chloride and a polyethylene terephthalate.
8. The straw described in claim 3 wherein the photochromic dye provides protection for materials within the polymeric member which are sensitive to ultra violet light.
9. The straw described in claim 3 , wherein the photochromic dye has an activated state and an inactivated state.
10. The straw described in claim 9 , wherein the maximum electromagnetic radiation absorbance wavelength or a local maximum electromagnetic radiation absorbance wavelength of the photochromic dye comprises the maximum electromagnetic radiation absorbance wavelength or a local maximum electromagnetic radiation absorbance wavelength of the photochromic dye in the activated state.