Mono-layer blow molded article with functional, visual, and/or tactile effects and method of making such articles
Blow molded articles having a predetermined feature incorporated into the wall provided by variations in the thickness of the wall of the article corresponding to a predetermined pattern etched into the preform from which the article was formed. Also, etched preforms for making blow molded articles and methods for making such preforms and articles.
1. A mono-layer blow molded article formed from a preform having a thermally-etched predetermined pattern, the article comprising:
a body including one or more walls surrounding an interior space and an opening in fluid communication with the interior space, the one or more walls having an inner surface, an article outer surface and a thickness;
a predetermined feature incorporated into the one or more walls, wherein the predetermined feature results at least partially from variations in the thickness of the one or more walls corresponding to the predetermined pattern, and the predetermined feature is a visually apparent feature selected from the group consisting of patterns, indicia, appearance of depth, and combinations thereof.
2. The mono-layer blow molded article of claim 1 wherein the predetermined pattern includes ablated regions.
3. The mono-layer blow molded article of claim 2 where the ablated regions are laser-etched regions.
4. The mono-layer blow molded article of claim 1 , wherein the article includes has an outer surface and a label disposed at least partially over the portion of the article outer surface corresponding to the predetermined pattern.
5. The mono-layer blow molded article of claim 1 , wherein the predetermined feature creates a topography on the article outer surface, the topography having a maximum peak/pit height, (Sz), less than 750 microns.
6. The multi-layer blow molded article of claim 1 wherein the predetermined feature creates a topography on the article outer surface, the topography having a maximum peak/pit height, (Sz), less than 250 microns.
7. The mono-layer blow molded article of claim 1 wherein at least a portion of the article outer surface corresponds to one or more etched regions of the predetermined feature, and wherein at least one of the etched regions has a root mean square roughness, (Sq), of less than or equal to 10 microns.
8. The mono-layer blow molded article of claim 7 wherein the etched regions all have a root mean square roughness, (Sq), of less than or equal to 10 microns.
9. The mono-layer blow molded article of claim 1 wherein the inner surface has a texture thereon and the article outer surface that is relatively smooth compared to the texture, wherein the texture corresponds to the predetermined thermally-etched pattern.
10. A method for making a blow molded article from a mono-layer preform, the method comprising the following steps:
a) providing an injection-molded preform of a thermoplastic material, the preform having a body and an opening, wherein the body has an outer surface and at least a portion of the outer surface of the preform has been thermally etched in a predetermined pattern to remove at least some of the thermoplastic material forming the body of the preform; and
b) blow molding the preform so to form an article, wherein a portion of the outer surface of the article corresponding to the etched portion of the preform has a Root Mean Square Roughness, Sq, of no greater than 10 microns.
11. The method of claim 10 wherein at least a part of the portion of the outer surface of the article corresponding to the etched portion of the preform has a Root Mean Square Roughness, Sq, of less than or equal to 8 microns.
12. The method of claim 10 wherein the entirety of the portion of the outer surface of the article corresponding to the etched portion of the preform has a Root Mean Square Roughness of less than or equal to 10 microns.
13. The method of claim 10 wherein the predetermined pattern creates a topography on the article outer surface, the topography having a Maximum Peak/Pit Height, Sz, less than 750 microns.
14. The method of claim 10 comprising the additional step of applying a label to at least a portion of the article outer surface.
15. The method of claim 14 wherein the label overlays at least a portion of the predetermined pattern.
16. A method for making a blow molded article from a mono-layer preform, the method comprising the following steps:
a) providing an injection-molded preform of a thermoplastic material, the preform having a body having one or more walls with a thickness and an opening, wherein the body has an outer surface and at least a portion of the outer surface of the preform has been thermally etched in a predetermined pattern to remove at least some of the thermoplastic material forming the one or more walls of the preform; and
b) blow molding the preform so as to form an article, wherein the at least a portion of the one or more walls corresponding to the etched portion of the preform varies in thickness in accordance with the predetermined pattern.
17. The method of claim 16 wherein the article has an article outer surface at least a portion of which corresponds to the predetermined pattern, the method further including the step of applying a label or printing to the portion of the article outer surface.
18. The method of claim 16 , wherein the predetermined pattern forms a topography on the outer surface, the topography having a Maximum Peak/Pit Height, Sz, less than 750 microns.
19. The method of claim 16 wherein the outer surface has at least a portion corresponding to the predetermined pattern, at least the portion of the predetermined pattern includes one or more etched regions, and wherein at least one of the etched regions has a Root Mean Square Roughness, Sq, of less than or equal to 10 microns.
20. The method of claim 16 wherein the etched regions all have a Root Mean Square Roughness, Sq, of less than or equal to 10 microns.