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| Method and apparatus for detecting a tamper condition and isolating a circuit therefrom |
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| Magnetoresistive sensor with track following capability |
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| Method of manufacturing a planarized magnetoresistive sensor |
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| Multi-layer gap structure for high resolution magnetoresistive read head |
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High flute density, printable, corrugated paperboard
| Details |
Inventors: Lingle, John E.; Paulson, Terry S.; Stucker, David B.;
Assignee: Innovative Packaging Corp. (Milwaukee, WI)
Primary Examiner: Loney; Donald
Assistant Examiner:
Attorney, Agent or Firm: Boyle Frederickson Ziolkowski S.C., Boyle; James F.
An extremely thin, high flute density, printable, corrugated paperboard having a combined caliper thickness of about 0.040 inches or less includes a first flat paper liner about 0.0085 to 0.010 inches thick, a corrugated medium having a paper thickness of about 0.005 to 0.008 inches, with the flute dimensions including a cordal flute height of about 0.021 inches and a distance between flute crests of about 0.070 inches, and a second flat paper liner about 0.0065 to 0.01 inches thick, the composite paperboard product having about 181 flutes per linear foot. The process for manufacturing the corrugated paperboard includes novel steps for forming the flutes in a manner which will not cause wrinkling or tearing of the paper stock, and the application of a novel adhesive formulation having solid content of about 28.8 percent and a Steinhall viscosity of about 23 seconds. |
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DETAILED DESCRIPTION An extremely thin, high flute density, corrugated paperboard suitable for use in high resolution offset lithographic printing presses, and a method for manufacturing such a product is disclosed.
The method of manufacturing extremely thin, high flute density, corrugated paperboard of the present invention includes the step of selecting appropriate grades of paper stock having a relatively high degree of porosity which allows moisture for the gluing operations to evaporate and migrate through the paper stock, as opposed to exhausting the moisture out through the flutes as occurs in a conventional corrugating operation, and the step of formulating a novel adhesive compound having an unusually high solid content and low viscosity in comparison to conventional adhesive formulations that have been traditionally used in corrugating operations.
The manufacturing method also includes several novel steps for processing the paper stock in a manner which will prevent wrinkling and tearing, and steps for applying and curing of the adhesive formulation in a manner which will facilitate and preserve the adhesive bonding of the various layers of paper stock.
The manufacturing process disclosed herein produces a corrugated paperboard having a combined board thickness of less than 0.
040 inches, which is suitable for use on high resolution graphics printing presses.
The extremely thin corrugated paperboard disclosed herein is comprised of a corrugated medium having approximately 550 flutes per linear meter (about 181 flutes per linear foot), which means that flutes are spaced together closely enough (about 1.
80 mm) to provide support to the exterior surface of the liner sufficient for printing.
The corrugated paperboard disclosed herein is thus well suited for use in constructing containers for packaging and shipping goods sold in a retail environment, such containers normally requiring very high quality graphics.
Other objects and advantages of the invention will become apparent from the following description which sets forth, by way of illustration and example, certain preferred embodiments of the present invention
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