Stretch Wrap and Dispenser
A stretch wrap applicator includes a member designed to engage the stretch wrap or stretch film as it is dispensed and to deform the stretch wrap by creating additional pockets of stretch on the stretch wrap transverse to its plane. The additional deformations caused by the member engaging the stretch wrap whether done in-line using the applicator or offline using equipment effects an additional stretch of the stretch film during application beyond the typical stretch caused by tension on stretch wrap when being applied to an object.
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This application claims the benefit of U.S. provisional patent application No. 61/716,666 filed Oct. 22, 2012, which is incorporated by reference herein in its entirety.
TECHNICAL FIELDThe invention relates generally to the packaging industry and, more specifically, to application of stretch film or wrap to objects.
BACKGROUNDStretch film or wrap is generally known in the industry as a material that can be used to securely wrap a collection of objects together using the stretch material's resiliency and clinginess. Stretch wrap is typically understood to be a polyethylene stretch film that is generally dispensed from a roll form for use in a variety of applications. For instance, stretch wrap is held against a collection of objects and dispensed and stretched around the collection of objects and wrapped over itself up to several times to cover and hold together the collection of objects. In the shipping industry, for example, a collection of materials may be placed on a pallet to secure such articles together during the shipping process. A collection of boxes placed on a pallet can be shipped as a single cohesive unit when bound together through wrapping with stretch wrap. Other applications of stretch wrap are known such as wrapping leftover food or simply binding together a collection of items.
Although such usages for stretch wrap are well known and documented, the amount of stretch wrap used in any given application can be extensive. For example, for an industrial supplier that ships large numbers of pallets of materials out on a consistent basis, a large inventory of stretch wrap must be maintained to facilitate the regular shipment of such products. For example, a large amount of stretch film may be necessary to wrap a given pallet of materials.
Typically, during application, a tension is applied to the stretch film as it is applied to the objects being wrapped. This tension stretches the film to facilitate a secure binding of the wrapped objects together. In typical approaches, the stretch creates a lengthening of the stretch wrap, but also creates significant narrowing of the stretch wrap in the direction not under tension. The narrowing causes less coverage of the object being wrapped and eliminating much if not all of the efficiency gained in stretching the stretch wrap. Most known devices work by rotating the film around a spindle core while tension is applied to the core of the stretch film to create drag so that when the stretch film unrolls it is stretched tight around the package. Another known device includes an idler roller that engages and rotates with the stretch wrap as it is pulled from its roll. The idler roller facilitates stretching of the wrap along its length due to the tension on the film. The roller also generally maintains the film's flat shape as it engages the object around which it is being wrapped. Although this stretch is advantageous, some narrowing does occur and further stretch and strength is still desirable. Another known approach is to stretch the stretch wrap with tension in the long direction while holding the sides of the stretch wrap to reduce narrowing. Such an approach is largely done through complex and expensive machinery.
SUMMARYGenerally speaking and pursuant to these various embodiments, a stretch wrap manipulator is provided that includes one or more members arranged, for instance, in series and designed to engage the stretch wrap to deform it by locally pushing a part of the stretch wrap transverse to its plane. The additional deformations or perforations caused by the one or more members engaging the stretch wrap effects additional strength and stability in handling the stretch wrap and an additional stretch of the stretch film during application above and beyond the typical stretch of the stretch wrap when being applied to an object.
In one described example, an idler roller that stretches and maintains the stretch wrap flat in previous devices is adapted to include protrusions that engage the stretch wrap and further stretch the stretch wrap locally where the stretch wrap engages the protrusions. This additional stretching caused by the engagement of the protrusions on the stretch wrap can effect a significant increase in the stretch of the stretch wrap.
The increase in stretch and strength of the stretch wrap is effected largely through bi-axially applied stretch through use of the protrusions rather than stretch in just one direction through the use of prior devices using strictly smooth members or no member at all. So configured, efficiency of use of the stretch wrap increases. These and other benefits may become clearer upon making a thorough review and study of the following detailed description.
The above needs are at least partially met through provision of the stretch wrap dispenser described in the following detailed description, particularly when studied in conjunction with the drawings, wherein:
Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions and/or relative positioning of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of various embodiments of the present invention. Also, common but well-understood elements that are useful or necessary in a commercially feasible embodiment are often not depicted in order to facilitate a less obstructed view of these various embodiments. It will further be appreciated that certain actions and/or steps may be described or depicted in a particular order of occurrence while those skilled in the art will understand that such specificity with respect to sequence is not actually required. It will also be understood that the terms and expressions used herein have the ordinary technical meaning as is accorded to such terms and expressions by persons skilled in the technical field as set forth above except where different specific meanings have otherwise been set forth herein.
DETAILED DESCRIPTIONReferring now to the drawings and, in particular to
The frame 205 also supports at least one member 230 having protrusions 233 configured to engage the stretch film 225 after the stretch film 225 extends from the roll 220 and before the stretch film 225 contacts the object. The protrusions 233 are configured to distort or variably stretch the stretch film 225 along a length of the stretch film 225 engaging the at least one member 230. In the example of
In operation, the dispensing apparatus 200 performs a method for applying a stretch film to an object including engaging the stretch film 225 being dispensed from the dispenser 200 with the at least one member 230 having protrusions 233 to variably stretch the stretch film 225 along a length of the stretch film 225 engaging the at least one member 230. Maintaining tension on the stretch film 225 during engagement with the at least one member 230 effects additional stretch on the stretch film 225 before application to an object. For example, as shown in
Generally speaking, when the protrusions 233 engage the stretch film 225, the protrusions locally stretch a portion of the stretch film 225 transverse to the plane of the stretch film 225. In contrast to the stretching of the film that is entirely in the plane of the stretch film 225 such as when the stretch film is applied using a dispenser like that of
For example,
Moreover, additional members including protrusions may be used to engage the stretch film as it is dispensed from the dispenser. For example, a second roller having protrusions may be placed along the stretch film's path extending from the dispenser before engaging the object.
An example application for dispensing stretch film from a stretch film dispenser such as accordingly to the teachings of this disclosure is shown in
Another application is illustrated in
Another example application of this subject matter is in applying the protrusions to bi-axially stretch the stretch film during the stretch film's preparation and prior to its being rolled onto a roll for dispensing. In one example of this approach, one or more members like that described above can be disposed to engage stretch film just before the stretch film is rolled up. One such example is illustrated in
Those skilled in the art will recognize that a wide variety of modifications, alterations, and combinations can be made with respect to the above described embodiments without departing from the scope of the invention, and that such modifications, alterations, and combinations are to be viewed as being within the ambit of the inventive concept.
Claims
1. An apparatus for applying a stretch film to an object, the apparatus comprising:
- a support configured to support a roll of stretch film and dispense the stretch film in response to tension on the stretch film;
- at least one member having protrusions configured to engage the stretch film after the stretch film extends from the roll and before the stretch film contacts the object;
- wherein the protrusions are configured to distort but not pierce the stretch film along a length of the stretch film engaging the at least one member.
2. The apparatus of claim 1 further comprising a support frame and wherein the support frame comprises a rotatable arm configured to rotate with the roll of stretch film relative to the support frame.
3. The apparatus of claim 2 wherein the support frame comprises an extension handle.
4. The apparatus of claim 1 wherein the at least one member having protrusions comprises an elongated rotatable member.
5. The apparatus of claim 4 wherein the elongated rotatable member is cylindrical with the protrusions extending out from a radius of the cylinder.
6. The apparatus of claim 1 comprising a handle configured to effect manual dispensing of the stretch film.
7. A method for preparing a stretch film for application to an object, the method comprising:
- engaging stretch film with at least one member having protrusions to alter the stretch film along a length of the stretch film by the engaging the at least one member.
8. The method of claim 7 further comprising maintaining tension on the stretch film after the stretch film engages the at least one member to effect additional stretch and/or increase ventilation from the stretch film before application to an object.
9. The method of claim 7 wherein the engaging the stretch film comprises the at least one member rotating with the stretch film as the stretch film engagingly moves past the at least one member.
10. The method of claim 7 further comprising dispensing the stretch film from a roll before the engaging the stretch film with the at least one member and just before application to the object.
11. The method of claim 7 further comprising rolling the stretch film onto a roll for later dispensing after the engaging the stretch film with the at least one member.
12. An apparatus for applying a stretch film to an object, the apparatus comprising:
- a support configured to support a roll of stretch film and dispense the stretch film in response to tension on the stretch film;
- a support frame comprising: a rotatable arm configured to rotate with the roll of stretch film relative to the support frame, and an extension handle;
- at least one elongated rotatable member having protrusions configured to engage the stretch film after the stretch film extends from the roll and before the stretch film contacts the object;
- wherein the protrusions are configured to distort or pierce the stretch film along a length of the stretch film engaging the at least one member.
13. The apparatus of claim 12 wherein the elongated rotatable member is cylindrical with the protrusions extending out from a radius of the cylinder.
14. The apparatus of claim 12 comprising a handle configured to effect manual dispensing of the stretch film.
Type: Application
Filed: Mar 12, 2013
Publication Date: Apr 24, 2014
Applicant: ENCORE PACKAGING LLC (Lake Bluff, IL)
Inventor: Timothy H. Nelson (Winnetka, IL)
Application Number: 13/797,372
International Classification: B65B 61/00 (20060101);