Rotational molding process and product using separation sheet
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B28B-001/02
B28B-001/20
B28B-001/44
B29C-065/00
출원번호
UP-0771154
(2007-06-29)
등록번호
US-7754133
(2010-08-02)
발명자
/ 주소
Bachner, Mark
Bachman, Paul
McMinn, Mike
Bartlett, Gary
Selner, Eric
Sandieson, Kevin
출원인 / 주소
The Little Tikes Company
대리인 / 주소
Renner, Otto, Boisselle & Sklar LLP
인용정보
피인용 횟수 :
0인용 특허 :
9
초록▼
A product and method where a multi-colored product is rotationally molded with no or essentially no blending of the colors. A separation sheet is positioned in the mold to separate relatively adjacent portions of the mold cavity that contain differently colored resins. The separation sheet acts as a
A product and method where a multi-colored product is rotationally molded with no or essentially no blending of the colors. A separation sheet is positioned in the mold to separate relatively adjacent portions of the mold cavity that contain differently colored resins. The separation sheet acts as a barrier to prevent the differently colored resins from blending during the molding process. During the molding process, the molten resins may fuse to opposite sides of the separation sheet, or the separation sheet may melt and disperse, all or in part, within the mold while maintaining a distinct color difference between the differently colored portions of the molded product.
대표청구항▼
What is claimed is: 1. A method of rotationally molding a multi-colored product, comprising the steps of: positioning a separation sheet in a mold cavity of a rotational mold; closing the mold with the separation sheet separating adjacent portions of the mold cavity that contain differently colored
What is claimed is: 1. A method of rotationally molding a multi-colored product, comprising the steps of: positioning a separation sheet in a mold cavity of a rotational mold; closing the mold with the separation sheet separating adjacent portions of the mold cavity that contain differently colored resins; rotating and heating the mold to melt the resins and cause the melted resins to flow within the cavity portions to form viscous membranes conforming to the mold's inner surface, and further to cause the viscous membranes to fuse with the separation sheet; and cooling the mold to cause the molten resins to harden and form respective portions of the product in the shape of the respective portions of the mold cavity, and further to form fusion bonds between the respective portions of the product and the separation sheet, thereby to form a molded product having a unitary structure. 2. A method according to claim 1, wherein the rotational mold includes mold parts forming the mold cavity therebetween, and the positioning step includes inserting the separation sheet into a groove in at least one of the mold parts. 3. A method according to claim 2, wherein each mold part has a groove for receiving a peripheral edge portion of the separation sheet. 4. A method according to claim 3, wherein the groove is continuous around the mold cavity. 5. A method according to claim 1, wherein the separation sheet is a plastic sheet. 6. A method according to claim 5, wherein the separation sheet is made of at least one of HDPE, MDPE, LLDPE, ABS, PS, PP, PVC, and mixtures thereof, and the resins are at least one of HDPE, MDPE, LLDPE, ABS, PS, PP, PVC, and mixtures thereof. 7. A method according to claim 1, wherein the separation sheet is 0.100-0.125 inches thick. 8. A method according to claim 1, wherein the mold is rotated about two axes of rotation. 9. A method of rotational molding comprising: providing a mold for a product to be molded; inserting a separation sheet into the mold, wherein the separation sheet has a first side and a second side opposite the first side; pouring a first resin having a first color into the mold adjacent the first side of the separation sheet; pouring a second resin having a second color different from the first color into the mold adjacent the second side of the separation sheet; and molding the product, wherein the first resin and the second resin do not mix during the molding process and wherein the separation sheet becomes an integral part of the product after molding. 10. The method of claim 9, wherein the step of molding the product comprises: maintaining the integrity of the separation sheet until such time as the first resin and the second resin have coated the mold, wherein the first and second colors are separated within the mold without mixing; melting the separation sheet; and dispersing the separation sheet within the mold while maintaining the color separation.
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이 특허에 인용된 특허 (9)
Contreras Joseph A. (41-303 Mount Kemble Ave. Morristown NJ 07960) Contreras Gregory P. (106 Hauge St. Jersey City NJ 07307), Apparatus for making multi-sectioned and multi-colored solid products having a desired geometric or other shape.
Buzzoni Giancarlo (Varese ITX) Cittadini Paolo (Varese ITX), Method for slush moulding articles of two or more colors from thermoplastic, thermosetting or elastomeric resins in powd.
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