Claims
- 1. A method of unitizing a load of successive units stacked in a longitudinal direction, the load having sides with circumferential junctions extending in a lateral direction between successive units, each of the units having at least one relatively high strength area which is resistant to circumferential crushing in the lateral direction and at least one low strength area which is substantially less resistant to circumferential crushing in the lateral direction than the high strength area, comprising:
- dispensing a web from a web dispenser and stretching the web along the direction in which it is dispensed;
- collapsing the web into a roped configuration;
- successively aligning the roped web with and within selected high strength area by moving the web dispenser generally in the longitudinal direction relative to the load and stopping the relative longitudinal movement of the web dispenser and the load at times when the web is in alignment with each of the selected high strength areas;
- successively wrapping the roped web circumferentially around the load at each of the selected high strength areas in alignment with and within each of the high strength areas, wherein the roped web applies significant pressure on the load only at the high strength areas;
- expanding the web from the roped configuration; and
- wrapping the expanded web around the load to cover the sides of the load in both the high and low strength areas.
- 2. The method of claim 1 wherein each of the units is a layer of subunits.
- 3. The method of claim 1 wherein the high strength areas are proximate to the junctions, and the step of collapsing the web includes forming the web into a configuration having roped edges of concentrated web material and a central unroped portion of web material connecting the roped edges, and the step of wrapping the roped web includes wrapping the roped web around the load at the junctions, covering the junctions with the unroped central portion of the web and grabbing the successive units with the roped edges to hold the units together.
- 4. The method of claim 1 wherein the web dispenser is moved one way along the longitudinal direction during the step of successively aligning the roped web, and the web dispenser is moved the opposite way along the longitudinal direction during the step of wrapping the expanded web around the load.
- 5. The method of claim 1 wherein the high strength areas include trays having sidewalls.
- 6. The method of claim 1 wherein the load has longitudinally extending corners and the step of aligning the roped web includes moving the roped web so that the roped web is wrapped around the corners only at the high strength areas.
- 7. The method of claim 1 wherein the step of wrapping the roped web occurs before the step of wrapping the expanded web.
- 8. An apparatus for unitizing a load of successive units stacked in a longitudinal direction, the load having sides with circumferential junctions extending in a lateral direction between successive units, each of the units having at least one high strength area which is resistant to circumferential crushing in the lateral direction and at least one low strength area which is substantially less resistant to circumferential crushing in the lateral direction than the high strength area, comprising:
- means for dispensing a web from a web dispenser and stretching the web along the direction in which it is dispensed;
- means for collapsing the web into a roped configuration and expanding the web from the roped configuration;
- means for controlling the alignment of the roped web by successively aligning the roped web with and within the selected high strength areas by moving the web dispenser generally in the longitudinal direction relative to the load and stopping the relative longitudinal movement of the web dispenser and the load at times when the web is in alignment with each of the selected high strength areas; and
- means for successively wrapping the roped web circumferentially around the load at each of the selected high strength areas in alignment with and within each of the selected high strength areas wherein the roped web applies significant pressure on the load only at the high strength areas, and for wrapping the expanded web around the load to cover the sides of the load in both the high and low strength areas.
- 9. The method of claim 1, wherein the load is unitized with a continuous web of packaging material so that the step of successively wrapping the roped web circumferentially around the load at each the selected high strength areas is performed by successively wrapping a continuous roped web of packaging material circumferentially around the load at each of the selected high strength areas.
- 10. The apparatus of claim 8 wherein each of the units is a layer of subunits.
- 11. The apparatus of claim 8 wherein the high strength areas are proximate to the junctions, and the means for collapsing the web forms the web into a configuration having roped edges of concentrated web material and a central unroped portion of web material connecting the roped edges, and the means for successively wrapping the roped web wraps the roped web around the load at the junctions, covering the junctions with the unroped central portion of the web and grabbing the successive units with the roped edges to hold the units together.
- 12. The apparatus of claim 8 wherein the means for aligning moves the web dispenser one way along the longitudinal direction when aligning the roped web, and moves the web dispenser the opposite way along the longitudinal direction when wrapping the expanded web.
- 13. The apparatus of claim 8 wherein the high strength areas include trays having sidewalls.
- 14. The apparatus of claim 8 wherein the load has longitudinally extending corners and the means for aligning the roped web aligns the roped web so that the roped web is wrapped around the corners only at the high strength areas.
- 15. The apparatus of claim 8 wherein the load is unitized with a continuous web of packaging material so that the means for successively wrapping the roped web include means for successively wrapping a continuous web of roped packaging material circumferentially around the load at each of the selected high strength areas.
- 16. A method of unitizing a load of successive units stacked in a longitudinal direction with a continuous web of packaging material, the load having sides with circumferential junctions extending in a lateral direction between successive units, each of the units having at least one relatively high strength area which is resistant to circumferential crushing in the lateral direction and at least one low strength area which is substantially less resistant to circumferential crushing in the lateral direction than the high strength area, comprising:
- dispensing a web from a web dispenser and stretching the web along the direction in which it is dispensed;
- collapsing the web into a roped configuration;
- successively aligning the roped web with and within selected high strength areas by moving the web dispenser generally in the longitudinal direction relative to the load and stopping the relative longitudinal movement of the web dispenser and the load at times when the web is in alignment with each of the selected high strength areas;
- successively wrapping the continuous roped web circumferentially around the load at each of the selected high strength areas in alignment with and within each of the high strength areas, wherein the roped web applied significant pressure on the load only at the high strength areas;
- expanding the web for the roped configuration; and
- wrapping the expanded web around the load to cover the sides of the load in both the high and two strength areas.
- 17. An apparatus for unitizing a load of successive units stacked in a longitudinal direction with a continuous web of packaging material, the load having sides with circumferential junctions extending in a lateral direction between successive units, each of the units having at least one high strength area which is resistant to circumferential crushing in the lateral direction and at least one low strength area which is substantially less resistant to circumferential crushing in the lateral direction than the high strength area, comprising:
- means for dispensing a web from a web dispenser and stretching the web along the direction in which it is dispensed;
- means for collapsing the web into a roped configuration and expanding the web from the roped configuration;
- means for controlling the alignment of the roped web by successively aligning the roped web with and within the selected high strength areas by moving the web dispenser generally in the longitudinal direction relative to the load and stopping the relative longitudinal movement of the web dispenser and the load at times when the web is in alignment with each of the selected high strength areas; and
- means for successively wrapping the continuous roped web circumferentially around the load at each of the selected high strength areas in alignment with and within each of the selected high strength areas wherein the roped web applies significant pressure on the load only at the high strength areas, and for wrapping the expanded web around the load to cover the sides of the load in both the high and low strength areas.
RELATED APPLICATIONS
This is a continuation-in-part of U.S. Pat. No. 07/347,063 filed on May 4, 1989, which is incorporate reference and is a continuation of U.S. patent application No. 186,348 filed Apr. 26, 1988 now U.S. Pat. No. 4,845,920, which is a continuation of U.S. patent application No. 871,149 filed Jun. 3, 1986 now U.S. Pat. No. 4,754,594, which is a continuation of U.S. patent application No. 125,275 filed Feb. 27, 1980 now abandoned.
The present invention relates to a unitized load and a method and apparatus for unitizing a load. More particularly, it relates to a unitized display package and a method and apparatus for unitizing a display package by stretch wrapping.
In a display package, products are arranged in stacked layers, unitized, shipped to the point of sale, and displayed at the point of sale without needing to be removed from the arrangement in which they are shipped. Since display packages are often used with products which do not have inherent strength, stiffening supports, such as cardboard trays and platforms, are used between each layer to contribute to stacking strength. Because the products do not have inherent strength, but need to be visible to the consumer at the point of sale, the cardboard support and trays only extend a small proportion of the height of the products.
Prior attempts to unitize display packages with stretch wrapping techniques prior to shipping have been met with several drawbacks. When stretch wrapping a display package with a web of stretch film, the stretch film can only be wrapped at low tension. Otherwise, the products will be distorted, crushed or otherwise damaged during the wrapping process. However, when the web is wrapped at low tension, it can not adequately unitize the stacked products and prevent them from coming apart and spilling when being transported to the point of sale.
Accordingly, it is an object of the present invention to provide a method and apparatus for stretch wrapping a display package which does not require a substantial amount of packaging material to protect the product when wrapping and transporting the product.
It is also an object of the present invention to provide a method and apparatus for wrapping a display package which advantageously utilizes the benefits of stretch wrapping including protection from moisture and dust, simplicity and economy in operation, and minimal modification of conventional stretch wrapping methods and apparatus.
It is a further object of the present invention to provide a method and apparatus for wrapping a display package which produces a resulting display package which stays unitized during transport, and does not require individual product removal during setup.
Additional objects and advantage of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of instrumentalities and combinations particularly pointed out in the appended claims.
To achieve the foregoing objects, and in accordance with the purposes of the invention as embodied and broadly described herein a method is provided for unitizing a load of successive units stacked in a longitudinal direction. The load has sides with circumferential junctions extending in a lateral direction between successive units. Each of the units has at least one relatively high strength area which is resistant to circumferential crushing in the lateral direction and at least one relatively low strength area which is substantially less resistant to circumferential crushing in the lateral direction than the high strength area.
A web is dispensed from a web dispenser and the web is stretched along the direction in which it is dispensed. The web is collapsed into a roped configuration and successively aligned with and within selected high strength area by moving the web dispenser generally in the longitudinal direction relative to the load and stopping the relative longitudinal movement of the web dispenser and the load at times when the web is in alignment with each of the selected high strength areas.
The roped web is successively wrapped around the load at each of the selected high strength areas in alignment with and within each of the selected high strength areas. The web is expanded from the roped configuration and wrapped around the load to cover the sides of the loads in both the high and low strength areas.
US Referenced Citations (5)
Foreign Referenced Citations (3)
| Number |
Date |
Country |
| 177413 |
Apr 1986 |
EPX |
| 2522113 |
Nov 1976 |
DEX |
| 2256871 |
Aug 1975 |
FRX |
Continuations (3)
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Number |
Date |
Country |
| Parent |
186348 |
Apr 1988 |
|
| Parent |
871149 |
Jun 1986 |
|
| Parent |
125275 |
Feb 1980 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
| Parent |
347063 |
May 1989 |
|
Patent Grant
5195297
