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Патент USA US3080259

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March 5, 1963
Filed Aug. 12, 1959
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Patented Mar. 5, 1963
hibitor are contained in unit A. Agitators 5 are in
stalled in a central position to agitate the ‘adhesion inhib
itor. Fans 6 are arranged at the circumference of out
let 3 so that the grains of the adhesion inhibitor may be
fed back to the inlet 2 ‘by means of flow-direction regulat
K‘atsuo Tanimura, Saburo Kawamura, Hideo Suzurnura,
- and Seiichi Sakakibara, Okayama-ken, and Koichr
ing plates 7 which have an appropriateinclination.
In unit B, a cylindrical casing 8 is connected with out
Nagano, Osaka-fu, Japan, 'assignors to Kuraslriki
Rayon Co., Ltd., ()kayama Prefecture, Japan, a corpo
ration of Japan
let 3 of part A.
Filed Aug. 12, 1959, Ser. No. 833,213
Claims priority, application Japan Aug. 12, 1958
8 Claims. (Cl. 117-9)
On both sides of the center line of cas
ing 8 where the thin ?lm passes through, buff-rolls 9
and 10 mad-e of cloth and bu?aroll 11 made of fur, or
10 imitation fur, ‘are installed in sequence.
This invention relates to a method of manufacturing -
Between these
rolls, partition plates 12 and 13 are ?tted so as to sep
arate the sets of rolls.
thin ?lms of polyvinyl alcohol. More particularly this
It is preferable to couple unit A with unit B in a ver
invention pertains to a novel method for the protection of
tical construction as shown in the attached drawing.
polyvinyl alcohol ?lms against adhesion, and to a novel 15 Units A and B, however, may be satisfactorily arranged
apparatus for carrying out the process.
a horizontal connection, if desired.
In order to make thin ?lms of polyvinyl alcohol which v in For
operating the process, the thin ?lm of polyvinyl
are serviceable for general packaging purposes the ?lms
alcohol is ?rst led into. casing 10f unit A through guide
are customarily subjected to a humidity conditioning
inletZ.‘ The microscopic ‘grains of an adhesive inhibitor
treatment in order to increase the softness and to raise 20 .4 are distributed throughout'the zone inside the casing
the tear strength. ‘For example, the thin ?lm- _of poly
vinyl alcohol, after heat treatment, is fed through a hu
of unitA by :the operation of, agitators 5,;fans 6‘ which
bring about. the air v?owjrequired to ?y the-microscopic
midity conditioning tank which is maintained at a tem
‘grains in all directions, and air flow direction regulating
perature of about 40° C. and a relative humidity of about
plates 7 which are inclined so as to feed back the micro
95%, for a period of 3 to 6 minutes in order to absorb 25 scopic ‘grains to inlet 2. The agitators 5 rotate in op
moisture on both sides of the ?lm. As a result of such
posite direction to fans 6. Fans 6 revolve at a rate of 100
absorption the water content of the ?lm may rise as high
to 500 revolutions per minute.
as 8 to 10%. The softness of the ?lm will be remark
The preferred adhesion inhibitor for use in lthe inven
ably increased and the tear strength will be satisfactorily
tion is hydrous silicic acid.
raised, but at the same time the surface of the ?lm will 30 hibitors can be employed.
However, other similar in
show adhesive qualities thereby making the ?lm tend to
The following example is given to illustrate the meth
stick together. This adhesive property of the ?lm causes
od of the invention and is not intended to limit the in
great loss of working efficiency in certain manufacturing
vention in any way.
processes, for example in plastic bag manufacture, where
Example 1
the operations must be completed in a relatively short
period of time.
An adhesion inhibitor comprising microscopic grains
A principal object of this invention is to provide a novel
having a grain size of 4 to 13 mi-llimicrons of hydrous
method for manufacturing thin ?lms of polyvinyl alcohol
silicic acid of 99.9% purity were placed in unit A of the
which Will have no tendency to stick together.
40 apparatus described in the drawing. Fans 5 for ?ying
Another object of the invention is to provide an ap
paratus which is simple and easy to operate for lessening
the tendency of thin polyvinyl alcohol ?lms to adhere to
each other.
Other objects and a fuller understanding of the inven
tion may be had by referring to the following description,
together with the accompanying drawing in which speci?c
the ?ne grains were rotated at the rate of 340‘ revolutions
per minute. When the air ?ow produced by the rotation
of the fans was blown against the surface of ?ne grains 4
the interior of unit A was completely ?lled with ?ne
grains in su?icient density. The thin ?lm of polyvinyl
alcohol was fed into this chamber through guide inlet 2
at a speed of 10 meters per minute with the result that the
forms of the apparatus and operation of the process have
Eire grains evenly adhered to the surface of the thin
been set forth for purposes of illustration.
According to this invention the thin ?lm of polyvinyl
The ?ne grains were effectively retained on the sur
alcohol to be treated is passed through a chamber where
face of the thin film by subsequently passing the ?lm
in the film surfaces are contacted with microscopic grains
through unit B where the surface of the ?lm was gently
of an adhesion inhibitor which adheres uniformly to the
rubbed with buff-rolls 9, 10 and 11 which rotated at the
surfaces of the ?lm. The ?lm is then cont-acted with
rate ‘of 340 revolutions per minute. Buff-rolls 9 and 10
buffing means which rub the grains of ‘adhesion inhibitor
were made of ?bers napped on the surface of the rolls.
into the surfaces of the ?lm thus permanently effecting a
Buff-rolls 11 were made of rabbit's fur planted on the
reduction in the adhesiveness of the ?lm surfaces.
surface of the roll.
Referring now to the attached drawing, which is a
The quantity of the adhesive inhibitor sticking to the
longitudinal cross-section through an apparatus suitable
surface of the ?lm was 0.01 to 0.05 gram per square
for carrying out the invention,
meter. The resulting ?lm had no detrimental adhesive
Unit A is a section where the microscopic grains of an 60 ness and there was no deterioration of the transparency
adhesion inhibitor are contacted with the surfaces of the
thin ?lm. Unit B is a section where the microscopic
grains of the adhesion inhibitor adhering to the surface
of the thin ?lm are thoroughly ‘and uniformly rubbed
into the surface of the ?lm.
In unit A, part 1 is a casing which may have a glob
ular, cylindrical, conical, or the like shape. The inlet
and out-let parts of casing 1 are suitably curved as indi
cated. Part 2 is an inlet guide and part 3 is an outlet 70
guide, which guides are located at central positions fac
ing each other. Microscopic grains 4 of the adhesion in~
of the ?lm.
What we claim is:
1. The method for reducing the adhesiveness of poly
vinyl alcohol ?lm surfaces which comprises contacting
said ?lm surfaces with particles of a ?nely divided gran
ular adhesion inhibitor to distribute said inhibitor par
ticles upon said surfaces and then buffing the ?lm surfaces
to imbed said particles of said inhibitor in the said ?lm
and thus to reduce the ?lm surface adhesiveness.
2. The method of claim 1 wherein said inhibitor is
hydrous silicic acid.
3. A method ‘for reducing the adhesivenessof polyvinyl
alcohol ?lm surfaces which comprises the steps of pass
ing a polyvinyl alcohol ?lmv into a ?rst zone, blowing
particles of a ?nely-divided granular adhesion vinhibitor
into contact with the surfaces of said ?lm, moving said
?lm into a‘second zone, and buf?ng the surfaces of said
?lm in said second zone to imbed said inhibitor particles
‘in said ?lm to reduce the ?lm surface adhesiveness.
4. A method as de?ned in claim '3, wherein said inhibi
tor ‘is hydrous silicic acid.
tact with the surfaces .of :said ?lm, means de?ning i1 55%;
ond con?ned zone for receiving said ?lm, means separat
ing said ?rst zone from said second zone except for a
con?ned passage for the movement of said ?lm from said
?rst zone into said second zone, and a plurality of spaced
apart pairs of rotating bu?ing members in said second
zone for bu?‘ing the surfaces of said ?lm in said second
zone to imbed said inhibitor particles in said ?lm to re
duce the ?lm surface adhesiveness.
8. An apparatus as de?ned in claim 7, wherein said
5. A ‘method for reducing the adhesiveness of poly-v
vinyl alcohol ?lm surfaces which comprises 'the steps of
ybu?’ing members comprise ‘counter-rotating fur-covered
passing a polyvinyl alcohol ?lm into "a ?rst zone, blow
members positioned ‘to receive the ?lm between them.
second zone overlies said ?rst zone ‘and wherein said
ing particles of a ?nely~divided granular adhesion inhibi
References Cited in the ?le of this patent
tor into contact with the surfaces of said ?lm, moving 15
said ?lm into a second zone, and buf?ng the surfaces of
said ?lm with ‘fur in said second zone to imbed said inhibi
tor particles in said ?lm to reduce the ?lm surface ad
Re. 22,419
vSrnyser _,_____ _________ __ Ian. 11, 1944
Brandenberger et al. __.____ July 23, 1935
6. A method as de?ned in claim 5, wherein said inhibi 20 ‘2,017,449
Thompson et al. v____,__,_._ Oct. 15, 1935
tor is hydrous silicic acid.
7. An apparatus for reducing the adhesiveness of poly:
vinyl alcohol ?lm surfaces which comprises means de?n
ing a ?rst con?ned zone for receiving .a polyvinyllalcohol
?lm, blowing-means in said ?rst zone'for blowing particles
of a ?nely-divided granular adhesion inhibitor into con
Wallach et a1. ____ _,._____ Oct. 13, 1936 I
McDowell et a1. _,._..,_V__.. Nov. ‘11, 1941 £
Menzel .---,-_-___:-.___o_._-1Dec- 29, 1942
Irons _-,-nv-_--o,_-,_ ---- q. Apr. .14, 1953
'Bainbridge--_.--.--_ 'Mar- 20, 19.54
Walsh et a1. ,_-__,__,._,_,_.._- Apr. 4, 179,61
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