Continuous batch tunnel washer and method

Abstract

A method of washing fabric articles in a tunnel washer includes moving the fabric articles from the intake of the washer to the discharge of the washer through first and second sectors that are a pre-wash zone. In the pre-wash zone, liquid is counter flowed in the wash interior along a flow path that is generally opposite the direction of travel of the fabric articles. The fabric articles are transferred to a main wash zone, and a washing chemical is added to the main wash zone. At about the same time, counter flow is reduced or stopped. The main wash zone can be heated as an option. After a period of time (for example, between about 20 and 120 seconds) counter flow is resumed or increased. In the wash zone, this is considered an intermediate rinse. After the wash zone(s), the increased counter flow after chemical treatment amounts to a pre-rinse. This pre-rinse ensures that the fabric articles are substantially free of soil or the majority of any soil and substantially free of chemicals when they are transferred to an extractor for final removal of excess water. A final rinse (second rinse) is conducted during extraction of excess water.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Priority of U.S. Provisional Patent Application Ser. No. 61 / 046,118, filed Apr. 18, 2008, incorporated herein by reference, is hereby claimed.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicableREFERENCE TO A “MICROFICHE APPENDIX”[0003]Not applicableBACKGROUND OF THE INVENTION[0004]1. Field of the Invention[0005]The present invention relates to continuous batch washers or tunnel washers. More particularly, the present invention relates to an improved method of washing textiles or fabric articles (e.g. clothing, linen, etc.) in a continuous batch tunnel washer wherein the textiles are moved sequentially from one module or zone to the next module or zone including initial pre-wash zones, a plurality of main wash and pre-rinse zones, and then transferred to an extractor that removes water. More particularly, the present invention relates to an improved method of washing textiles in a continuous batch tunnel was...

AI Technical Summary

Benefits of technology

[0011]The present invention improves the current art by reducing water consumption, improving rinsing capability, reducing the number of components required to perform the function of laundering fabric articles or textiles, and saving valuable floor space in the laundry.

[0012]The present invention reduces and / or combines zones, sectors, or modules and improves the method of processing the textiles. Rinsing is done in two zones, first in the continuous batch washer itself in an intermediate rinse zone after each main wash zone(s) and a pre-rinse in the last zone(s). A final rinse is then done in a mechanical water removal machine such as a centrifugal extractor or mechanical press.

[0015]The process of the present invention uses fresh water that can be supplied through an atomizing nozzle while the goods are being extracted. Because the free soil has already been removed in the pre-rinse zone, the spray rinse while extracting will not re-deposit soil on the linen thereby reducing or eliminating graying of the goods. It is not necessary to centrifuge (and drain at a low speed) the soil laden water before the final extract. With the present invention the process time is reduced. The amount of fresh water required compared with conventional processes is reduced.

[0016]The method of the present invention uses less water than in current art because the counter flow is stopped for part of the cycle. The spray rinse in the centrifugal extractor or mechanical press is more effective than the current practice of draining the free water from the linen and then refilling.

[0017]The method of the present invention preserves the washing effectiveness of current counter flow washers to wash heavy soil classifications because the amount of soil dilution is the same even though there are less zones, stages, or modules. The present invention provides a higher effective rinsing provided by the spray rinse in the centrifugal extractor because of the pre-rinse.

Problems solved by technology

This practice dilutes the washing chemical and reduces its effectiveness.

Additionally, while the bath liquor is being heated, this thermal energy is partially carried away by the counter flow thus wasting energy while a desired temperature value is achieved.

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