US1714916A - Pulp-suction die - Google Patents

Description

May 28, 1929. J.' F. LOW

' PULP SUCTION DIE Filed April 25, 1928 INVE-NTOR BY ic/ /zizmd w 7 4 I WWVI VV/M Patented May 28, 1929.

UNITED STATES PATENT GFFIQE.

JAMES FLEMING LOW, OF TORONTO, ONTARIO, QANADA'.

PULP-SUCTION DIE.

Application filed April 23,

. This invention relates to an improved pulp suction die, as described in the present speci-- 'cifically in the claims for novelty following a description containing an explanation in detail of an acceptable form of the invention.

The objects of the invention are to construct an eflicient die, simple in construction and of manufacture; to design a die that is not easily plugged and that may be easily cleaned and readily assembled to the die holder or vacuum chamber; and generally to provide an economical die capable of accomplishing the aforesaid purposes.

This die is adapted to be used in such machines as are now known to the art and is particularly adaptable to the vacuum chamber described in a former filed October 31, 1927, as erial No. 230,021 and is also an improvement over the die described in the said application.

In the drawings, Figure 1 is a plan view of the die assembled.

Figure 2 is a perspective view of one of the segments in the die.

Figure 3 is a fragmentary cross sectional view showing the die assembled in any of the usual die boxes.

Figure 4: is a fragmentary plan view of Figure 2.

Like numerals of reference indicate corresponding parts in the various figures.

Referring to the drawings, 10 is the die complete consisting of the two end clamping pieces 11 held in position by the bolts 12 having the countersunk heads 13 and nuts 13A countersunk in the openings 14 formed in the clamping pieces 11, and the corrugated segments pr strips 16 held in place between the clamping pieces 11. The corrugated segments 15 have regularly spaced holes 16 punched therethrough through which the bolts 12 are inserted, thus serving to prevent any "end motion of the segments, the bolts 12 fitting snugly through the holes 16. The upper edge 17 may be given any shape so as to give the desired shape to the article being formed on the die. The segments 15 are corrugated in such a manner that the ridges or fragmentary corrugations will be normal to the upper face I of the die, that is vertical to the longitudinal axis of said segments, and are placed side by gatent application 7 1928. Serial No. 272,182.

side so that the points 18 of the corrugations in the segments will coincide with said points in the neighbouring segment, and thus small cells or openings 19 will be formed between each of the segments through which the vacuum will act to draw the moisture from the die and leave the pulp substance deposited on the upper edge 17.

The chief advantage in this form of die is that the most minute particles of pulp are deposited on the upper edge'of the corrugations, as the openings or cells 19 are very small and prevent the pieces from being drawn into said openings bysuction. Another advantage is that any strips of pulp will be prevented from entering the openings. as sometimes happens in the caseof laminated dies in which strips are spaced one from another by shims or spacers. It will be noted that the. points 18 ofthe corrugations are slightly rounded so as to present a proper bearing space against which the neighbouring segment or corrugated strip may bear.

In Figure 3, the die 10 is shown as assembled in the die box 22 and the relieved portion in the upper edge 17 of the segments or corrugated strips is shown as at 20. It is to be understood that the edge 17 may be given such a profile as to form any of the desired shapes. In the drawings the thickness of the corrugated stri s are exaggerated considerably for the sa e of clearness. It is to be noted that the corrugations are so formed that the openings 19 will be very small, that is approximately the same as a very fine screen, the strips themsefigg ing in the neighbourhood of from .010 t I an inch in thickness, or of a greater thickn advisable.

What I claim is:

1. In a pulp suction die a plurality of vertically corrugated sheets drawn together in point to point contact and set in a suction box and forming a mould bed at the upper ends and water passages therefrom.

' 2. In a pulp suction die, a plurality of vertically corrugated sheets clamped together from the moulds and clamping bars and bolts. the points of corrugation in said metal strips 5. In a pulp suction die a matrix comprisbear ng one against the other, a pair of metal ing a plurality of corrugated sheets having bars terminating the die on two sides thereof,

angular points meeting angular points and holes through said corrugated strips and 15 5 bolt holesin alignment, bounding Walls havthrough said metal bars, bolts engaging said ing bolt and nut recesses and bolts extending holes and anchored in said bars and forming through said bolt holes and having their means of releasably locking said strips in heads and nuts countersunk in said recesses. their spaced relation between said bars.

6. Ina pulp suction die, a plurality of cor- Signed at the city of Toronto, this 8th day 20 10 rugated metal strips forming on one edge of February,'1928. v the configuring wall of said die and having JAMES FLEMING LOW.

Images