Formed thermoplastic article having a peelable surface and smooth edges
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-051/30
B32B-003/26
B32B-027/08
B29C-051/14
B29C-051/26
B65D-053/06
B32B-007/06
B29L-031/00
출원번호
US-0787261
(2017-10-18)
등록번호
US-10118332
(2018-11-06)
발명자
/ 주소
Wallace, Millard F
출원인 / 주소
Converter Manufacturing, LLC
대리인 / 주소
Preti Flaherty
인용정보
피인용 횟수 :
0인용 특허 :
13
초록▼
The disclosure relates to forming shaped thermoplastic articles having smooth peripheries. Many thermoplastic articles have sharp edges formed upon molding or cutting the article from a feedstock sheet. Such sharp edges can damage thin plastic films or flesh which they contact, and smoothing the edg
The disclosure relates to forming shaped thermoplastic articles having smooth peripheries. Many thermoplastic articles have sharp edges formed upon molding or cutting the article from a feedstock sheet. Such sharp edges can damage thin plastic films or flesh which they contact, and smoothing the edges is desirable. Described herein are methods of forming a smooth periphery for such sharp-edged articles by rolling over the sharp edge. The smoothing operation is performed by forming a deflectable flange including a bend region separated from the potentially sharp peripheral edge by a spacer, deflecting a portion of the deflectable flange, and softening at least one bent portion of the deflectable flange to yield a smooth periphery upon cooling. A liner sheet may be attached to the feedstock sheet prior to, during, or after forming and can be peelable therefrom.
대표청구항▼
1. A shaped article comprising: a) a thermoplastic sheet having a shape which includes a peripheral edge and a body having a concave interior portion, the thermoplastic sheet including a deflectable flange extending peripherally away from the interior portion and including the peripheral edge, the d
1. A shaped article comprising: a) a thermoplastic sheet having a shape which includes a peripheral edge and a body having a concave interior portion, the thermoplastic sheet including a deflectable flange extending peripherally away from the interior portion and including the peripheral edge, the deflectable flange includingan extension adjoining the junction between the body and the deflectable flange,a bend region interposed between the extension and the peripheral edge, the bend region forming an angle of not less than 75 nor more than 105 degrees between the extension and a spacer interposed between the bend region and the peripheral edge, anda bent portion between the bend region and the peripheral edge, the bent portion having a smooth periphery and being sufficiently bent that the peripheral edge is displaced from the periphery of the article, whereby the article has a smooth periphery; andb) at least one pliable liner sheet conforming to and being peelably attached to the thermoplastic sheet, the liner sheet being detached from the thermoplastic sheet at least a portion of the peripheral edge. 2. The shaped article of claim 1, wherein at least one liner sheet is peelable attached to each of the interior portion, the extension, and the bent portion of the thermoplastic sheet. 3. The shaped article of claim 1, wherein each of the peripheral edge, the bent portion, and the extension completely surrounds the interior portion, and wherein each of the interior portion, the extension, and the bent portion of the thermoplastic sheet has a liner sheet peelably attached thereto. 4. The shaped article of claim 3, wherein the same liner sheet is peelably attached to each of the interior portion, the extension, and the bent portion of the thermoplastic sheet. 5. The shaped article of claim 4, wherein a graspable tab is interposed between the liner sheet and the thermoplastic sheet at least one position along the peripheral edge. 6. The shaped article of claim 4, further comprising a lidding attached to the liner sheet completely around the interior portion. 7. The shaped article of claim 6, wherein the lidding is attached to the liner by way of a gas-tight seal and the space between the lidding and the liner with the seal contains a gas. 8. The shaped article of claim 6, wherein the lidding is attached to the liner by way of a gas-tight seal and wherein the lidding and the liner contain between them at least one item not including any substantial amount of a gas. 9. The shaped article of claim 1, wherein the thermoplastic sheet includes a reservoir portion recessed away from and entirely within the interior portion and wherein at least the liner sheet that is peelably attached most distally from the thermoplastic sheet surface bears a perforation therethrough at the reservoir portion, does not conform to the thermoplastic sheet at the reservoir portion, and is not peelably attached to the thermoplastic sheet at the reservoir portion, whereby liquid in the lumen of the interior portion is able to traverse the liner sheet at the reservoir portion. 10. The shaped article of claim 9, comprising i) a non-perforated liner sheet which is peelably attached to the thermoplastic sheet at each of the reservoir portion, the interior portion, the extension, and the bent portion of the thermoplastic sheet andii) the perforated liner sheet attached to the non-perforated liner sheet. 11. The shaped article of claim 1, wherein the extension includes the peripheral edge, a flat sealing surface surrounding the concave interior portion, and the bent portion interposed between the peripheral edge and the sealing surface, the sealing surface being suitable for sealing the sealing film thereto using either of VSP and MAP sealing technologies, and the bent portion being bent sufficiently that the peripheral edge is turned at least approximately opposite the periphery. 12. The shaped article of claim 1, wherein the peripheral edge is turned away from the periphery of the tray. 13. The shaped article of claim 1, having the overall shape of a rectangular tray with rounded corners. 14. The shaped article of claim 1, wherein the bent portion includes a rounded portion. 15. The shaped article of claim 14, wherein the rounded portion has a J-shaped conformation. 16. The shaped article of claim 14, wherein the rounded portion has a U-shaped conformation. 17. The shaped article of claim 14, wherein the rounded portion has a spiral conformation. 18. The shaped article of claim 1, wherein the extension bears a flat sealing surface and completely surrounds the concave interior portion of the body. 19. The shaped article of claim 18, wherein a gap exists between the bent portion and the concave interior portion of the body. 20. The tray of claim 19, wherein the gap occurs about the entire periphery of the article. 21. The tray of claim 20, wherein the width of the gap at each position about the concave interior portion of the body is at least half the width, measured in the direction extending peripherally away from the concave portion of the body, of the flat sealing surface at that position. 22. The tray of claim 20, wherein the width of the gap at each position about the concave interior portion of the body being at least three-quarters the width, measured in the direction extending peripherally away from the concave portion of the body, of the sealing surface at that position. 23. The article of claim 1, wherein the shape of the concave interior portion is not circular. 24. A shaped article comprising: a) a thermoplastic sheet having a shape which includes a peripheral edge and a body having a non-circular concave interior portion, the thermoplastic sheet including a spacer bearing the peripheral edge, the spacer being connected to the body by way of an extension that extends peripherally away from the body and a bend region interconnecting the spacer and the extension, the bend region having a smooth contour and interconnecting the spacer at an approximately right angle with the extensionb) at least one liner sheet conforming to and being laminated against the thermoplastic sheet. 25. The shaped article of claim 24, wherein at least one liner sheet is peelable attached to each of the interior portion, the extension, and the bent portion of the substrate sheet. 26. The shaped article of claim 24, wherein the liner sheet is perforated. 27. An article comprising a thermoplastic sheet having a peripheral edge and defining a non-circular shaped body having an extension extending peripherally away from the body, the extension including the peripheral edge, anda bent portion interposed between the peripheral edge and the junction between the body and the extension, the bent portion having a smooth periphery and being sufficiently bent that the peripheral edge of the thermoplastic sheet is displaced from the periphery of the article, yielding an article having a smooth periphery; anda pliable liner peelably attached to the thermoplastic sheet. 28. The article of claim 27, including multiple pliable liners peelably attached to the thermoplastic sheet. 29. The article of claim 27, wherein the liner is delaminated from the thermoplastic sheet at least a portion of the peripheral edge. 30. The article of claim 27, wherein the peelable layer is a non-thermoplastic material.
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