US2268462A - Tube container - Google Patents

Description

Dec. 30, 1941. G. sAcHsENRDl-:R rE1" A1.

TUBE CONTAINER Filed Nov. 4,. 1958 Patented Dec. 30, 1941 TUBE CONTAINER Gustav Sachsenrder and Alois Brossette, Wuppertal-Barmen, Germany Application In 6 Claims.

This invention relates to methods of producing tubes of the kind used as envelopes for colours, dental or shaving cream and the like and to the products of such methods.

The primary object of the invention is to produce tubes of the kind referred to from cellulosic material.

A special object is to treat or coat the cellulosic material in a manner to prevent any interaction between the cellulosic material and the filling substance that may be deterimental for the filling substance and/or for the tube.

Another special object is to treat or coat the cellulosic material at i'lrst in a manner to render its surface more adapted for the application of a protective coating and'to prevent peeling of! of said protective coating.

Various further objects of the invention will become apparent from thefollowing detailed description of the invention in connection with the accompanying drawing showing by way of example some embodiments of products of our novel methods, viz.-

Fig. l is a side view of a tubular hose of cellulosic material.

Fig. 2 is an axial section of the tubular body with the contracted and reinforced mouth end, stretched on a mandrel for drying.

Fig. 3 is a front elevation of the tube shown in Fig. 2.

Fig. 4 is an end elevation of the same tube.

November 4, 1938, Serial No. 238,783 Germany November 6, 1937 Fig. 5 is a fragmentary cross sectional view of cellulosic material which has been parchmentized throughout.

Fig. 6 is a similar view of partly parchmentized material.

Fig. 'l is a fragmentary cross sectional view of the wall of the tube in its coated form.

Fig. 8 is a cross section on line VIII- VIII of Fig. 2.

Fig. 8a is a detail of Fig. y8.

Similar reference numerals denote similar parts in the various figures.

Referring now to the drawing in greater detail, Fig. 1 shows a rectangular sheet I of parchment paper wound in a circular form in such a manner that the opposite longitudinal edges overlap each other as indicated at 2 in Figs. l and 4. The parchment paper advantageously consists of alkaline cellulose, more particularly, sodium cellulose where the tube is intended for fatty substances, and of cotton or cellulose wool or wood pulp where the tube is intended for substances containing much water. The material may be in the form of a continuous strip which i -by means of machines known in is formed to a hose in al continuous operation and cut off to the length required for the tube,

the tube making industry. The paper may be parchmentized by hydrating it, for instance, by action of sulphuric acid, before it is folded to form a hose. Preferably, the folding and joining operations of the overlapping ends are carried out while the sulphuric acid is still acting upon the material. In this' case,. the surfaces of the paper are still sticky and may be joined by simply pressing them together, so to speak; in a welding operation. It is, however, also contemplated to use an additional adhesive or glue for joining the overlapping edges although the welding of the seam in the parchmentizing operation yields a very strong and uniform joint which in most instances will be better than the joint obtained by an adhesive.

When the hose has been formed and cut to the desired length, its front end is contracted to form a mouth piece 3 of any suitable form, for example, of the conventional form shown in Figs. 2 and`3. vThe contracting may be carried out in machines similar to those known in the tube making industry, in such a manner that folds 5 are formed in the material which become deeper and deeper towards the front end to permit the reduction in diameter. Thus, the screw cap portion 4 is thickened at the same time. Advantageously, the contracting is carried out before the hydrating process is finished so that the folds will also Weld together and form a solid unit.

The tube body lmay, now be provided with a protective varnish coating, but we have found that it is very advantageous to treat the surface of the tube body at first in a manner to render it more suitable for the application of the varnish coating, because the hornified surface.l

of the parchmentized paper does not generally permit good adhesion of the varnish coating. The substance which is filled into the tube, more particularly slight percentages of water in this substance, tend to penetrate through the varnish coating Ainto the parchment material whereby the coating is separated 'from the parchment material.

In order to remove this drawback, we apply on the tube wall at first a coating 9, Fig. '7, which is highly adhesive and removes the hygroscopicity of the tube walls to such an extent that the varnish coating sticks very tightly to the tube body even at the portions'that may be folded in the'use of the tube.

`8, Fig. 4 to permit the acce surface.

We have found that as such adhesive coating polymerisation products are highly' suitable, i. e. artiilcial polymerisation products, for example, polyacryl acid ester or polyvinyl acetate or articial "rubber or caoutchouc of the kind known `under the trade name Buna, or natural other method is to apply the coating by a spraying process. The tubular body is then dried before application of the protective varnish coat-" ing. In order to prevent the parchment from shrinking and forming folds, it is preferably dried in a stretched condition. To' this end, a bipartite mandrelv 6 may be inserted into the tube, and spread by a Wedge member 1. The mandrel and wedge are preferably fluted as at ss of air to the inner Whenithe adhesive coating 9 has been dried or hardened, as the case may be, the outer coating,

lll, Fig. 7, may be applied, in a similar manner as the coating 9. The varnish I isapplied in the form of a solution o f articial resin, nitrocellulose, acetyl cellulose, cellulose acetobutyrate or the like in a suitable solvent, Preferably, mixtures of varnishes may be used.

Any other varnish ma'1 also be used within the scope of the invention provided that it is capable of imparting to the material the waterproof characteristics required.

The cross section of a completed three-layer tube is shown in Figs. 8 and 8a, illustrating the' three layers -and the way they are joined at 2.

In order to prevent -any detrimental action of the varnish film upon the adhesive layer, a solvent is used for the varnish which while ensuring a good anchoring of the varnish material in the adhesive layer does not destroy the continuous layer thereof. The same applies as regards the solvent of the adhesive layer. The thicknesses of both layers may be increased by repeatedly coating the tube. v

Where the tube is intended for fatty substances, the paper or parchment is preferably strongly hydrated, i. e. to such an extent that no non-hydrated or non-gelatinized iibres remain in the material, as indicated in Fig.5, While n, tubesintended for substances containing much water are preferably only slightly hydrated, i. e.l

to such an extent only that the central portion of the paper still shows non-gelatinized iibres. as indicated at Il in Fig. 6. In this case it is possible to use as the first coating substance polymerisation products or organic rubber material (latex) dispersed in water, whereby the solid residues of the dispersion penetrate deeply into the fibrous interior region of the parchment and form a deeply reaching anchoring for the protective layer. Accordinglythe process is in this case carried out in such a manner that the tube sections before being vformed with a contracted mouthend are treated with a dispersion oi' polymerisation products or organic rubber substancesin water, which are then dried and hardened, if necessary, whereupon the covering layer I0 is apvplied. y

The mouth end of the tube is preferably reinforced byv additional material as indicated at I2 Vasesina the cylindrical end nipple l. To this endl cellulosic material may be applied by dipping or spraying, or metal such as tin or aluminium may be applied by dipping the tube head into the molten metal or by spraying the metal onto the tube head after the well known metal spraying process.

Our novel method of making tubes is preferably carrled out in a continuous process comprising the steps of forming a hose from the paper strip, cutting the hose to pieces of the desired length, hydrating the paper, contracting the mouth end, applying the adhesive layer, drying or hardening the same, applying the covering layer and drying or hardening the same and reinforcing the mouth end which may be provided with a thread as indicated at i2.

It will be understood that the single steps of the process may be carried out in the above mentioned order or in any other suitable order, depending on the special conditions.

Example Sodium cellulose in the form lof a band similar to blotting paper is immersed into sulphuric acid of a strength of-58 B. and of a temperature of 15 C. for a period of l to 30 seconds depending on thethickness of the paper' and the desired The band is then degree .of hydratisation. formed into a hose and immersed into a bath consisting of a mixture of vinyl acetates of dii'- ferent characteristics, i. e., different viscosity, containing at least solid matter, dissolved ,in

ethyl ether. Benzene, amyl acetate, butyl acetate or acetic acid ether may also vbe used as solvents and all the said solvents may be used individually 'or in'any suitable combination.

solid matter and dissolved in acetone, some softening or plastisizing agent, for example, toluol, being contained, if desired. The amount of the solvent is governed by the fact that the solution must be suitable for forming a hardening varnish lm on the. tube material. The coating or nlm thus formed is again dried .or hardened in the manner described and the tubular'body may be treated further in the manner'described above to form the tube. Y

Various substances and method steps for treating cellulosic materials have been described in the U. S. Patent 2,075,328. The substances and method steps mentioned in this patent may be used in connection Iwith our novel process as far as they are suitable in connectionl with this process, but it will be clear that in our process the resin material is not converted by means of pressurel and-heat, but by a method which is similar to the usual .vulcanizing methods, using chemically reactive substances for converting the i interior layer. By way of example, parchxnent,

-containing gelatine, is converted to an unsoluble substance by formaline which causes hardening -of the gelatine. In a similar manner the varnish coating acts chemically upon the adhesive coat-I mg. We are aware that many changes may be made and numerous details of the process and product may be varied through a wide range without departing from the principles of this invention.

We claim:

1. In a process of producing tubular envelopes of the kind referred to, the steps which comprise forming a tube body of cellulosic material, at least partly parchmentizing said cellulosic material, contracting the mouth end of said tube body, and treating said cellulosic material with a substance adapted to improve the adhesiveness of said cellulosic material and then with a varnish film.

2. In a process of producing tubular envelopes of the kind referred to, the steps which comprise forming a tube body of cellulosic material, at least partly parchmentizing said cellulosic material, contracting the mouth end of said tube body, treating said cellulosic material with a liquid containing an adhesive of the group comprising polymerisation products, organic rubber substances, and articial rubber substances, drying, and then treating the body with a varnish.

3. In a process of producing tubular envelopes of the kind referred to, the steps which comprise forming a tube body of cellulosic material, contracting the mouth end of said tube body, treating said cellulose material with polymerisation products dissolved in organic substances, drying, and-then treating the body with a varnish.

4. In a process of producing tubular envelopes of the kind referred to, the steps which comprise forming a tube body of cellulosic material, at least partly parchmentizing said cellulosic material, contracting the mouth end of said tube body, treating said cellulosic material with polymerisation products dispersed in water, drying, and then treating the material with a varnish.

5. In a process of producing dispensing tubes for aqueous substances, the steps which comprise forming a tube body of cellulosic material, slightly parchmentizing said cellulosic material.

' inwardly crimping one end of the body to form a tube end, treating said material with an aqueous dispersion of a substance of the group comprising polymerisation products, organic rubber and artificial rubber, and then treating said tube with a varnish adapted to form a nlm.

6. In a process of producing dispensing tubes for fatty substances, the steps which comprise forming a tube body of cellulosic material, thoroughly parchmentizing said cellulosic material, inwardly crimping one end of the body to form a tube end, treating said material with a substance of the group comprising polymerisation products, organic rubber, and artificial rubber dissolved in an organic solvent, and then treating said tube with a varnish adapted to form a iilm.

GUs'rAv sAcHsENRDEa. Y ALOIS BROSSETTE.

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