초록 ▼

A method and apparatus for forming a double-thickness bead in a flexible sheet stock article, such as a container or lid constructed from paper stock. The method includes holding a central region of the paper stock blank near its perimetral edge between cooperating dies, forming an axially extending

A method and apparatus for forming a double-thickness bead in a flexible sheet stock article, such as a container or lid constructed from paper stock. The method includes holding a central region of the paper stock blank near its perimetral edge between cooperating dies, forming an axially extending flange in the blank between the held region and the edge, capturing the edge against radial movement in a groove provided in a ring movable relative to the dies, and moving the ring relative to the dies to form the double-thickness region in the blank between the held portion and edge. The apparatus includes the cooperating relatively movable dies, the movable ring and cooperating draw pads adjacent the ring. The draw pads are movable relative to the dies and ring and cooperate with the dies and ring to form a void into which the double-thickness region is formed. The configuration of the void controls the formation and configuration of the bead.

대표청구항 ▼

A method for forming a bead in an article formed from a blank of flexible material comprising holding a central region of the blank between two cooperating dies, while holding said central region, forming an axially extending flange in the region of the blank between said central region and the peri

A method for forming a bead in an article formed from a blank of flexible material comprising holding a central region of the blank between two cooperating dies, while holding said central region, forming an axially extending flange in the region of the blank between said central region and the perimetral edge of the blank, capturing the perimetral edge against radial movement in a first groove provided in a ring movable with respect to said dies, moving the ring relative to the dies to form the region of the blank between the central region and the perimetral edge into a bead, and moving with respect to said dies and said ring cooperating draw pads provided adjacent said ring, the cooperating draw pads cooperating with the ring and dies to create a void into which the bead is formed, the configuration of the void controlling the formation of the bead.