Tubular knitted filter cover and process for preventing runs

Details Tubular knitted filter cover and process for preventing runs Tubular knitted filter cover and process for preventing runs

1993-04-27

1995-03-28

Dawson, Robert A.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2104972, 210506, 156148, 156181, B01D 2917

Patent

active

054014093

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process and a device for preventing runs in the knitted textile filter cover of a draining element, especially for fruit presses, by providing rigid setting or bonding of the stitches at the end of the filter cover.
Such draining elements are placed in the pressing space of a fruit press and serve the purpose of directing the extracted juice from the pressing space to separate juice collecting spaces. For this purposes, the rod-shaped, flexible core of the draining element is provided with longitudinal slots and surrounded by a knitted textile filter cover, through which the juice penetrates and is discharged along and through the longitudinal slots into the juice collecting space. The ends of each draining element are fastened in a detachable manner by drainage locks to the juice collecting plates, which, on the one hand, border the pressing space and, on the other hand, border the juice collecting spaces.
When assembling the draining element, a filter cover end is drawn over each rubber sleeve placed at the ends of the core and secured with an O-ring. This process is possible only with an expansion of the filter cover periphery. Because of the knitted type of production of the filter cover, stitches frequently become undone under lateral tensile stress at the filter cover end, and this unraveling or a run travels toward the inside to outside the drainage lock area and destroy the filter cover in this area or at least greatly reduces the filtering action. To avoid the formation of runs, the filter cover ends were previously already cut to length and set with a hot-wire cutting device. Nevertheless, runs always occur again in the case of careless assembly. The setting of the stitches by heat sealing prevents the formation of runs. But, on the other hand, it also eliminates the expandability of the filter cover end and thus makes the assembly more difficult or even make it impossible.
The object of the present invention is to prevent, at a relatively small cost, the formation of runs on the filter cover when it is assembled, without as a result adversely affecting the assembly.
According to the invention, this object is achieved in that at least partially runs are allowed in the fastening area of the filter cover and these runs are stopped at the end of the fastening area by setting or bonding the stitches.
So that runs may occur in limited numbers at the filter cover ends and are stopped again after a specific length, the setting of the stitches in one or more of the first rows of stitches is interrupted in peripheral direction and is placed offset in one or more rows of stitches at the end of the fastening area in peripheral direction.
In a preferred embodiment of the invention, the settings are made circular and placed in peripheral direction at every second stitch, and the settings at the end of the fastening area are offset by one stitch relative to the settings of the first row of stitches in the peripheral direction.
In various other modifications of the invention, the settings in the peripheral direction can be made straight, oblique, undulating, zigzagged or dotlike.
To achieve the greatest possible degree of expandability of the filter cover end, in another modification, runs are allowed without limiting their number, in the entire fastening area of the filter cover, and these runs are stopped at the end of the fastening area by a setting uninterrupted in peripheral direction.
The setting, viewed in the direction of the pressing space, is placed in front of the O-ring of the drainage lock.
To increase the wear resistance of the filter cover, according to another feature of the invention, the setting of the stitches is lengthened in the direction of the pressing space and extends over the entire area of the critical wear zone of the draining element.
An improvement of the wear behavior can also be achieved in that instead of the permanent setting within the wear zone, the filter cover is reinforced with a wear-resistant thread. In this case, runs are simultaneously also p

REFERENCES:
patent: 2070073 (1937-02-01), Walton
patent: 2659958 (1953-11-01), Johnson
patent: 2907095 (1959-10-01), Frey
patent: 3409008 (1968-11-01), Mortensen et al.
patent: 4154883 (1979-05-01), Elias
patent: 4473432 (1984-09-01), Leader et al.

Affiliated with

Also associated with

Rating

Tubular knitted filter cover and process for preventing runs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tubular knitted filter cover and process for preventing runs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tubular knitted filter cover and process for preventing runs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2248198