Method for forming sleeves

• US 5,492,588 A
• Filed: 03/28/1994
• Issued: 02/20/1996
• Est. Priority Date: 03/28/1994
• Status: Expired due to Term

• Current Assignee: Highland Supply Corporation
• Original Assignee: Highland Supply Corporation
• Inventors: Weder, Donald E., Craig, Frank
• Primary Examiner(s): YODER, MICHELE
• Application Number:
  US08/219,221
• Time in Patent Office: 694 Days
• Field of Search: 156/201, 156/290, 156/251, 156/292, 156/308.4, 156/324, 156/461, 156/515, 156/543, 493/194, 493/196, 493/287, 493/295, 493/296, 53/451, 53/455, 53/452, 53/399, 383/907, 220/678, 206/423, 47/72, 229/87.01
• US Class Current: 156/251
• 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 2160/10 rectangular and flat, i.e. without structural provision for thickness of contents
• CPC Class Codes: B31B 2160/30 pointed or tapered
• CPC Class Codes: B31B 70/00 Making flexible containers, e.g. envelopes or bags
• CPC Class Codes: B31C 7/00 Making conical articles by winding
• CPC Class Codes: Y10T 156/101 Prior to or during assembly with additional lamina
• CPC Class Codes: Y10T 156/1054 and simultaneously bonding [e.g., cut-seaming]
• CPC Class Codes: Y10T 156/1313 Cutting element simultaneously bonds [e.g., cut seaming]
• CPC Class Codes: Y10T 156/1712 Indefinite or running length work

Abstract

A sleeve forming method and apparatus where sleeves are formed by use of overlapping webs. The webs are twisted in one direction to form a seal at one side of a sleeve and later twisted in the opposite direction to form the seal at the opposite side of a sleeve, such that all of the sleeves are oriented in the same direction, such as with the large openings of the sleeves facing upwardly and the smaller openings of the sleeves facing downwardly.

Claims

1. In a method of forming sleeves from overlapping webs wherein the webs are sealed together and severed along lines extending at acute angles across the webs with adjacent lines extending at opposed angles to form a sleeve between each pair of lines having one end larger than the other end, the improvement comprising:

twisting the webs first in one direction, when one seal is made, then in the opposite direction when a next seal is made, whereby all of the sleeves are oriented in the same direction when produced.

2. The method defined in claim 1 characterized further to include the step of opening each sleeve as the sleeve is formed.

3. The method defined in claim 1 wherein the webs are twisted using a feed blade between the webs.

4. The method of claim 1 wherein the webs are twisted using grippers engaging the sealed ends of the webs.

5. A method of forming sleeves from overlapping webs, comprising the steps of:

extending the webs from a source of supply with the free ends of the webs sealed together at a first acute angle across the webs;

twisting the webs in one direction ninety degrees;

sealing and severing the webs along a line extending at a second acute angle across the webs a distance from the free ends of the webs, with said second acute angle being opposed to said first acute angle to form a sleeve between said seals having one end larger than the other end, and leaving the free ends of the webs sealed along said second acute angle;

untwisting the webs;

again extending the webs from the source of supply;

twisting the webs ninety degrees in the opposite direction; and

sealing and severing the webs along a line extending at said second acute angle across the webs a distance from the free ends of the webs to form a sleeve between said last mentioned two seals having one end larger than the other end and extending in the same direction as the first sleeve formed and leaving the free ends of the webs sealed along said second acute angle.