US 2631108 A
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Patented Mar. 10, 1953 PROCESS OF PREPARING A DIPPING FORM William D. Timmons, Coshocton, Ohio, assignor to Pretty Products, Inc., Coshocton, Ohio, a
corporation of Ohio No Drawing. Application December 23, 1948, Serial No. 67,080
This invention relates to the art of gloves which are made of rubber or the like and which are roughened, and includes an improved dipping form and the process of making the same as well as the finished glove itself.
Heretofore it has been the practice to make such a roughened glove by first dipping the conventional smooth form into latex and then roughening the surface of the lower part of the glove by dipping it into acid while the cast isstill upon the form. This old process, however, has resulted in an irregular pattern and it has rather weakened the glove in various parts thereof.
It is therefore the object of my present invention to devise a new dipping form with a roughened surface upon which a roughened glove may be prepared in the first instance.
A further object consists in my particular manner of preparing the roughened surface upon the dipping form so as to render the same practical in the formation of the glove thereupon and in the removal of the glove therefrom.
A further object relates to the new glove itself with its roughened surface that is prepared upon the new dipping form as herein referred to;
my object in this regard being to produce a glove with a roughness that is of a substantially uniform pattern throughout and that is of an additive nature instead of the subtractive nature of the weakened glove which has resulted from the past practice, as above referred to.
Other objects will appear from the following description and claims.
It is to be understood that the present form of disclosure is merely for the purpose of illustration and that there might be devised various modifications thereof without departing from the spirit of my invention as herein set forth and claimed.
According to my present invention, 1 start with a conventional porcelain glove-dipping form and first remove therefrom the high gloss of its surface as employed in the past practice above referred to. Part or all of the surface of the dipping form may be roughened according to the type of glove it is desired to produce. It is to be understood of course that after casting a glove upon my improved dipping form, the glove will be turned inside out so as to bring the roughened surface to the outside thereof.
The roughening of the porcelain dipping form, as just briefly referred to, may be effected by grinding or acid-etching; and I have devised a means for reducing the likelihood of the rubber building up on the roughened surface of the form so as to thereby lessen the frequency with which the form would have to be cleaned except for my present improvement.
With this in mind, after having roughened the surface of the porcelain dipping form, as'above mentioned, I apply thereto an insoluble metallic soap film; and this is done by first immersing the form in a weak solution of approximately :01 per cent of a sodium salt of oleic, stearic, palmitic or otheracid that will combine with the metallic substance employed, as will be explained. While the dipping form is immersedin this solution, as above stated, this solution is brought to the boiling point and the form is then allowed; to drain but without, washing. The, dipping form may then be immersed in a solution of from approximately three (3) to five (5) percent of aluminum acetate or other suitable metallic salt for approximately five minutes, after which the form is removed and washed in running water for approximately one hour in order to preclude any undesirable repellancy to the normal pick-up of the rubber upon the surface of the dipping form.
The above treatment of the roughened dipping form may be repeated as often as found necessary according to the particular formula employed in the process herein outlined.
Aluminum is preferred for the insoluble metallic deposit (aluminum stearate or aluminum oleate, etc), upon the roughened surface of the dipping form as it does not discolor the form or the rubber; although my present invention is to be understood as comprehending the use of a suitable salt of any other suitable metallic substance, as for instance magnesium, tin, antimony, zinc, silver, lead, cerium, thorium, selanium and cadmium, that will combine with the first metallic salt solution to form an insoluble metallic soap deposit upon the roughened surface of the clipping form.
In referring to rubber or rubber-like materials, it is to be understood that this invention may be applied to gloves of rubber, synthetic rubber, plastics and highly plasticized solid resins.
Thus, whereas the old chemical process of roughening the glove after having been cast upon the conventional smooth dipping form, results in uneven distribution of the rubber with consequent reduction in the strength of the glove and lack in uniformity of its thickness; whereas the old chemical process is practically impossible to' control; and where as also the old air emulsion process for roughening the surface of the cast rubber glove subtracts the air or gas bubble from the rubber and hence weakens the membrane of the rubber; my present process provides the glove with an additive and more uniform roughness that is intended and calculated to overcome the subtractive faults of the old chemical and air emulsioniprocesses as above briefly noted. Furthermoregthe glove which has its-surface roughened by means of my present improved invention, presents a more attractive appearance than the old form of roughened glove. Other practical advantages of my present invention will 'suggest: themselves to those who are. tamiliarr with the. art to which this invention relates.
What I claim is:
1. In the art of glove-making; the process of preparing a dipping form therefor; includingt'thesteps of substantially roughening the surface of a dipping form of a porcelain base material, jim-- merslng the form in am approximately 0.01 per cntz-solutiom ofzarsoiuble salt ofasoa-p forming and; bringing: the solution to; the: boiling point,then removing and drainingtheiormcwi-thithenrimmersing' the.- form in. an: ap proximatelyfi to. l 5: per. cent; solution. of asoluble inorganic-metallic: saltv that will combine with thez aforesaide soluble salt to: form an insoluble metallicisoa-p;randitheniwashing the coated form in". water. sir as-tm leav'errupon: the roughened surfaca of: the dipplngi form: an; insoluble. deposit of metallic: soap: of substantially'uniform thickness and! whereby themoughened surface-of the. dippingfornnisfsubstantiallymaintained;
2. In the art of. glove-making,. the process: of preparing-a dipping form therefor; including. the
steps of substantially roughening the surface of a dipping form of a porcelain base material, immersing the form in an approximately 0.01 per cent solution of a soluble salt of stearic acid and bringing the solution to the boiling point, then removing and draining the form without washing; then immersing the form in;v an approximat'ely 3 to 5 per cent solution of"aluminum acetate, and then washing the coated form in water so as to leave upon the roughened surface of the dipping: form; an; insoluble deposit of metallic soap of substantially uniform thickness and whereby theroughened surface of the dipping fOIll'I; is substantially maintained.
WILLIAM D. TIMMONS.
REFERENCES CITED The-following references are of record in the file of this patent:
UNITED. STATESEA'IENTfi Number- Name Date- '7232'30'2 'Efeiff'en ...l\Ia-1:t2.4; ,1903 742,212 Jacobs Ojc.t. v 27,1903 919,406 Warren a w Apr:.27 ,,1909
1,959,021" Dales May,15;,1934 2,311,438 Thomas tFeb. 16,1943 2,315,310" Bitterretzal. ,Mar. 30,1943 2,344,960 Beal .Mar..28,- 1944 2393298 Delaneyetial.l Jan..22; 19.46
FOREIGN PATENTS Number Coimtry Date 13,108- Netherlands ,May -1 5, 1925 386248 Great:Britain, ,Jan-. 12. 1933