Special receptacle or package – Plural paper bags
Reexamination Certificate
1999-02-19
2001-09-11
Bui, Luan K. (Department: 3728)
Special receptacle or package
Plural paper bags
C383S209000, C493S228000
Reexamination Certificate
active
06286680
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a pack of bags made of thermoplastic foil, wherein the bags are interlocked into a pack at least area-wise in an area of an edge strip and have a perforated tear-off line formed below the interlocked area for separating the bags from the interlocked edge strip and a bag bottom is formed by a weld seam in an area opposite the edge strip.
This invention further relates to a method for producing a pack of bags from bags made of thermoplastic material, wherein the bags are made from a tubular plastic film laid flat by making a bottom weld seam transversely with respect to the longitudinal extension and the feed direction of the tubular foil, and the bags are cut parallel with and next to the bottom weld seam, and the bags are thereafter stacked into a pack and interlocked in an edge area located opposite the bottom weld seam and wherein, after the termination of the deposition of further bags, a perforated tear line for tearing the bags individually off the pack is stamped into an edge area of each pack near the interlocked edge area.
2. Description of Prior Art
Interlocked packs of plastic bags are known, they are used as a stock for the individual removal of a bag when it is needed, which is torn off the interlocked pack along a perforated tear line. In addition, packs of bags are often offered in redistribution packages or in dispenser boxes for individual removal. Reference is made only by way of example to German Patent Publication DE 94 08 149.2 U1 or U.S. Pat. No. 5,655,682.
SUMMARY OF THE INVENTION
This invention is based on one object of providing a pack of bags made of thermoplastic material, as well as a method for doing this, which pack can be made of a small size, for example considerably smaller than the individual bag, and which furthermore allows the clean tearing off of individual bags from the pack. The bag is also intended to have sufficient stability and sturdiness not only because of the selection of the plastic foil, but also with respect to the weld stability of the bottom weld.
One object on which this invention is based is attained in connection with packs of bags of the type in accordance with the species by reducing the bag width. Each bag of a pack is folded around folding edges extending in a longitudinal extension of the bag and in the folded position is interlocked in the edge area with the pack. The tear line of the folded bags stamped into the pack of bags is designed in the form of sickle-shaped incisions, wherein the sickle-shaped incisions extend as far as the longitudinal sides of the pack of bags. The sickle-shaped incisions are cut through the longitudinal sides of the bags, so that the folded bags are separated at outer lateral edges from the interlocked edge strip and connecting strips are formed between the sickle-shaped incisions, by which the bags are connected with the edge strip in such a way that the connecting strips tear off when the bags are pulled off.
In accordance with this invention the method for producing packs of bags made of a thermoplastic material is distinguished because prior to or following a welding of the bottom weld seam the tubular foil is folded in around at least one folding edge extending in the longitudinal direction of the tubular foil and of the bag to be produced. A tear line, including sickle-shaped, bent or half-wave-shaped incisions with narrow connecting strips remaining between them, is stamped into the pack of bags, wherein the incisions are also made on the lateral edges of the bags, or respectively the pack.
In order to reduce large size bags to smaller sizes, the individual bags are folded prior to being interlocked around at least one folding edge extending in the longitudinal direction of the bag, for example transversely in relation to the bottom weld, wherein multiple folding is preferred. In this case it is possible to perform a simple V fold, for example the reduction of the width of the bag by one half, or a so-called M fold, for example three folding edges and a reduction of the bag width to a quarter, or also around four fold edges, depending on the width of the bag.
In order to reduce the length of the bag it is proposed to fold over the pack of bags as a whole once or twice transversely to the longitudinal extension of the bags. In this case an S-shaped or Z-shaped fold-over is possible the same as a C-shaped fold-over toward the inside, or also a one-and-a-half or two-and-a-half fold over. It is possible in this way to offer large size bags in small size packs, and then to offer these small size packs in appropriate dispenser boxes or in enclosed or redistribution packages for the individual removal of the bags.
It is important for removal of the individual bag from the pack, for the bag edge to not tear near the provided perforated tear line. Thus, in accordance with this invention the tear line is designed in a shape of individual sickle-like incisions, wherein the sickle-like incisions are also made along the lateral edges of the folded bags, or respectively of the pack of bags in particular, so that the bag to be separated from the pack is previously cut off the edge strip in this area. Then the bags interlocked in the pack are only connected with the edge area of the pack at a few connecting strips, wherein the connecting strips are symmetrically arranged with respect to the longitudinal extension of the pack of bags and in this way makes possible even tearing off of the bag, and also makes possible individual folds of the folded bag from the edge strip, wherein tearing of the bag edge is prevented.
The sickle-shaped incisions form perforations, which form a garland-shaped tear line with long incisions, and are important for the invention, wherein sickle-shaped incisions also include wave-shaped incisions of sinusoidal-shaped waves, or arc-shaped incisions or very long-extending incisions.
Advantageous further developments of this invention are discussed in this specification and in the characterizing features of the dependent claims.
In place of the perforated tear lines customary up to now, wherein a multitude of short incisions or holes are interspersed with intermediate strips of approximately the same length, because of which tearing must be performed forcefully along the entire tear line, in accordance with this invention only very few connecting strips remain, wherein a stress on the bag in the area of the bag opening takes place only at these few locations and therefore tearing proceeds very rapidly and cleanly, without tearing into the bag in the area of the bag edge. Also, a particularly advantageous shape of the connecting strips remains because of the sickle-shaped incisions, which makes tearing off easier without tears occurring in the bag edge. The sickle-shaped incisions are arranged in a garland-like manner along the tear line, and their largest bulges are directed toward the bottom of the bags. At least two sickle-shaped incisions with a connecting strip between them, but preferably at least three sickle-shaped incisions or four sickle-shaped incisions with two, or respectively three, connecting strips between them remaining, are provided as a tear line on the pack of bags.
Spacings of 2 to 3 cm between the connecting strips of the tear line are preferred, wherein the connecting strips have a width of approximately 1 to 3 mm at the tear-off location.
The design of bags with tear lines, which are embodied as perforations in the shape of stamped half-waves, arcs or sickles, allows easy and clean tearing off of the bags from the pack, requiring little user strength and without tearing of the bag foil. Preferably a tear line of at least three incisions and two connecting strips remaining between the incisions is stamped into the pack.
The bottom weld seam in the bags interlocked into packs can be made either prior to or after the bags are folded. If the bottom weld seam of the bags is made over the entire width of the unfolded bag during production, it is a simple weld seam.
To increase the
Bui Luan K.
Pauley Peterson Kinne & Fejer
LandOfFree
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