Method for connecting two ends of flat tubular film sheets equipped with side creases

• US 20030089760A1
• Filed: 10/17/2002
• Published: 05/15/2003
• Est. Priority Date: 10/17/2001
• Status: Active Grant

• Current Assignee: Windmöller & Hölscher KG
• Original Assignee: Windmöller & Hölscher KG
• Inventors: Nobbe, Ludger
• Granted Patent: US 7,175,729 B2
• Time in Patent Office: Days
• US Class Current: 228/171
• CPC Class Codes: B29C 65/02 by heating, with or without pressure
• CPC Class Codes: B29C 66/004 Preventing sticking together, e.g. of some areas of the parts to be joined
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/5221 for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
• CPC Class Codes: B29C 66/853 Machines for changing web rolls or filaments, e.g. for joining a replacement web to an expiring web
• CPC Class Codes: B29L 2023/001 Tubular films, sleeves
• CPC Class Codes: B29L 2031/7128 Bags, sacks, sachets tea bags B29L2031/7122; medical bags B29L2031/7148
• CPC Class Codes: B31B 2155/00 Flexible containers made from webs
• CPC Class Codes: B31B 2155/002 by joining superimposed webs, e.g. with separate bottom webs
• CPC Class Codes: B31B 2160/20 with structural provision for thickness of contents
• CPC Class Codes: B31B 50/02 Feeding or positioning sheets, blanks or webs
• CPC Class Codes: B31B 50/024 Rotating holders, e.g. star wheels, drums
• CPC Class Codes: B31B 50/60 Uniting opposed surfaces or edges; Taping
• CPC Class Codes: B65H 2301/46015 of (half) tube webs
• CPC Class Codes: Y10T 156/1052 with cutting, punching, tearing or severing
• CPC Class Codes: Y10T 156/1056 Perforating lamina
• CPC Class Codes: Y10T 156/1059 Splitting sheet lamina in plane intermediate of faces
• CPC Class Codes: Y10T 156/1062 Prior to assembly
• CPC Class Codes: Y10T 156/1064 Partial cutting [e.g., grooving or incising]

Abstract

In order to connect the ends of flat tubular film sheets made of thermoplastic plastic that are equipped with side creases with one another by means of a lateral welding seam in such a manner that the interior creases remain permeable from the exterior even in the connection area, one end is equipped with cuts separating the interior edges of the side creases. The other end is inserted or placed into the separated area in such a way that both walls include the other end with a layer each of each side crease of the end area of the one tubular film between themselves. Separating layers are inserted or placed into the side creases of the included other end area, and the ends are then connected with one another by means of a lateral welding seam.

Claims

1. Method for connecting two ends of flat tubular film sheets equipped with side creases (2) made of thermoplastic plastic, preferably for connecting the end of a side crease tubular film roll with the beginning of a new side crease tubular film roll,

characterized in that

one end is equipped with cuts separating the interior edges of the side creases (2), and the other end is inserted or placed into the separated area in such a way that both walls (3, 5) include the other end with one layer (4, 6) each of each side crease (2) of the end area of the other tubular film (1) between themselves, and

that separating layers (9) are inserted or placed into the side creases of the included other end area, and the ends are then connected with one another by means of a lateral welding seam (10).

2. Method according to claim 1, characterized in that the interior edges of the beginning of the new tubular film roll (1) are separated.