US3877968A - Finished paper for casings and process of preparing same - Google Patents
Finished paper for casings and process of preparing same Download PDFInfo
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- US3877968A US3877968A US268108A US26810872A US3877968A US 3877968 A US3877968 A US 3877968A US 268108 A US268108 A US 268108A US 26810872 A US26810872 A US 26810872A US 3877968 A US3877968 A US 3877968A
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- alcohol
- cellulose
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- casings
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- 238000000034 method Methods 0.000 title claims abstract description 41
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229920002678 cellulose Polymers 0.000 claims abstract description 34
- 239000001913 cellulose Substances 0.000 claims abstract description 33
- 239000004627 regenerated cellulose Substances 0.000 claims abstract description 20
- 239000012991 xanthate Substances 0.000 claims abstract description 20
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003513 alkali Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 235000019441 ethanol Nutrition 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000005470 impregnation Methods 0.000 claims description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 3
- 239000002585 base Substances 0.000 abstract description 20
- 238000011282 treatment Methods 0.000 abstract description 7
- 238000005406 washing Methods 0.000 abstract description 6
- 239000000243 solution Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 9
- 239000002253 acid Substances 0.000 description 7
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 6
- 239000010408 film Substances 0.000 description 4
- 239000012266 salt solution Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000019645 odor Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 235000013580 sausages Nutrition 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 240000000907 Musa textilis Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- -1 for example Chemical compound 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000010446 mirabilite Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
Definitions
- ABSTRACT Finished paper for casings and method of preparing the same comprises impregnating a thin base paper with excess alkali cellulose Xanthate solution, subjecting the impregnated paper to an alcohol treatment to produce regenerated cellulose and then water washing and drying the treated paper.
- This invention relates to finished paper for casings and method of preparing same.
- regenerated cellulose serving as a water absorptive reinforcing binder.
- One method solidifies and fixes regenerated cellulose at crossing points of the fibers in the base paper.
- Another method applies regenerated cellulose on the surface of the relatively thick paper so as to set the regenerated cellulose into a form of extremely thin film.
- the base paper is tough, such as one composed mainly of bast fibres
- the paper composing fibres are rapidly weakened in their mutual intertwining strength due to swelling caused by alkali.
- the hydrogen bonding force between the cellulose molecules is greatly reduced due to the presence of moisture. Consequently, the original shape of the base paper is deformed under its own weight.
- an alkali cellulose xanthate solution with an acid salt solution (such as, for example, a mixture solution of sulfuric acid and Glaubers salt) to thereby salt out, solidify and regenerate the deposited alkali cellulose xanthate.
- an acid salt solution such as, for example, a mixture solution of sulfuric acid and Glaubers salt
- the alkali cellulose xanthate provides film-like smooth surface.
- the aforementioned process is employed in the manufacture of rayon, staple fibres or cellophane.
- a thin, such as a Japanese paper base paper made of cellulose is absorbed or impregnated with a large quantity of an alkali cellulose xanthate solution and then subjected to an alcohol treatment to produce regenerated cellulose. Thereafter the thus treated base paper is washed with water and then dried.
- the inventive method enables rapid formation of regenerated cellulose which is industrially adaptable. Manufacturing costs are reduced. Also the product may be coated with a large amount of regenerated cellulose and have high wet strength. Moreover, release of waste material which can pollute the environment is avoided.
- FIG. 1 depicts an illustrative apparatus used in the practice of the invention
- FIG. 2 depicts a casing made of the inventive paper
- FIG. 3 depicts an alternative casing made of the inventive paper
- FIG. 4 depicts another alternative casing made of the inventive paper.
- R is the component part ofthe alcohol used, which alcohol may be a lower alcohol such as, for example, methyl or ethyl.
- Regeneration of cellulose may be easily effected by the above reaction which produces xanthates from lower alcohol.
- the substitution reaction is completed almost instantaneously by shifting from left to right in the above formula) quantitatively.
- it has the advantage that since only alcohol which has higher permeability than the acid salt solution, participates in the reaction, there is by-produced no decomposed substance inside the coating.
- the conventional acid neutralization method produces such decomposed material. Hence, no offensive odors or unwanted residues are produced during the reaction. Accordingly, it is highly simple to remove impurities from the inventive product and to wash the product.
- the present invention it is possibble to dispose of the slight amount of residues or by-products isolated from, but still in the alkali cellulose xanthate solution during the alcohol treatment in a simple manner by washing with water. From the post reaction alcohol treating liquid, alcohol and carbon bisulfide may be recovered. It is desirable that the alcohol used in the reaction have a high purity. Hence, the used alcohol containing s [R- c O'Na,
- the waste liquid may be neutral and, if necessary, the admixtures therein can be readily precipitated away.
- FIG. 1 there is shown an example of a flat plate processing apparatus in which the present inventive method may be practiced.
- the base paper 3 is drawn out of a tank 2 containing a highly concentrated alkali cellulose xanthate solution 1. It is successively delivered into a portion of treating tank 5 containing liquid alcohol, such as ethyl or methyl alcohol, on one side of a partition plate 6 contained therein and lifted up from another portion on the opposite side thereof to be further carried to the washing and drying steps not shown.
- the used alcohol treating liquid in tank 5 is discharged out from the bottom thereof into sealed tank 7 in which the liquid is neutralized with an acid supplied thereinto from a pipe 8.
- the resulting neutralized liquid is then fed into an alcohol still 10 provided with a steam jacket 9, wherein alcohol is fractionated.
- the fractionate is further guided into a cooler 11 wherein the fractionate is cooled and liquified to separate low boiling point CS
- the C5,, freed alcohol is received in tank 12 from which it is again recycled and supplied into alcohol tank 5 through a pipe 13. Waste fluid or liquid is separated and released away from the bottom of still 10.
- CS separated in cooler 11 is recovered separately and suitably treated to ensure perfect preclusion or elimination of offensive odors and other possible hazards.
- Manila hemp, linter, staple fibre available on the open market and powdery (or fibriform) polyvinyl alcohol were blended at ratios of 70, l0, l7 and 3 percent by weight, respectively, and the blend was then subjected to a cylinder paper machine the same as in a foundrinier machine.) to produce a thin Japanese paper having a thickness of about 14 to 20 gm/m by using a normal process. The Japanese paper was then used as base paper 3.
- an alkali cellulose xanthate solution which had been adjusted to cellulose concentration of 8.5 percent, Hottenroth number of 11, and caustic soda content of less than 6.0 percent (the lower the better the results), was supplied into and held in tank 2 of FIG. 1.
- the base paper 3 was immersed in the solution in the aforementioned manner so that the base paper was sufficiently impregnated with the solution.
- the amount of impregnation may be varied slightly according to the shape of the paper and the intended use, but usually it is on the order of 700 to 800 gm/m in the case of one time immersion and on the order of 400 gm/m in case of placing two sheets in layers or in case of performing immersing twice.
- Blending of powdery polyvinyl alcohol in the base paper is to provide reinforcement to the base paper and to enable it to withstand the force of gravity or handling after the impregnation treatment.
- About 3% blending of the alcohol, as used in this example, provides sufficient endurance even in the case of one time immersion as discussed above.
- the impregnated base paper upon being lifted up from the treating liquid or xanthate solution, is passed around a roll 14 having a compact smooth surface in such a manner that the paper is closely placed on the surface of the roll so as to prevent deformation of the paper shape. It is then charged into treating tank 5 containing ethyl alcohol, wherein the paper is immersed for a duration of several minutes to about ten minutes or longer until the reaction by alcohol is completed. Thereafter, if necessary, the thus treated paper is further subjected to washing with water and drying to thereby complete the entire process.
- the cellulose processed paper obtained in accordance with this invention can be effectively used for making casings, such as for packing foodstuff, such as for example, high quality ham, sausages, etc.
- Casing materials require high wet strength since they must resist internal pressure exerted during the stuffing process when the casing is wetted. They must also be suitably flexible to withstand contracting and stiffening during smoking operation when the finished article is finally shaped.
- the cellulose processed paper of this invention easily meets such requirements since the paper is coated with a film of thick regenerated cellulose to provide high wet strength.
- the finishing into a cylindrical casing may be achieved in the following manner.
- the processed paper for example, may be'joined at opposite ends to form a vertical joint 15 as shown in FIG. 2.
- the paper may be formed into a strip 20 and coiled spirally as shown in FIG. 3.
- the strip shaped paper 21 is first coiled spirally in one direction to form a cylindrical body and then again coiled spirally in the opposite direction to thereby finish the casing into a double coiled cylindrical casing.
- the overlapped base paper portions of the cylindrical casing may be either joined during the step of alcohol setting, by application of an alkali cellulose xanthate solution or bonded in a separate step by using a suitable adhesive (such as cellulose ester, cellulose ether polyamide, epoxy resin, butyral resin, formal resin or the like).
- a suitable adhesive such as cellulose ester, cellulose ether polyamide, epoxy resin, butyral resin, formal resin or the like.
- the method of the invention has many advantages over the conventional methods in which alkali cellulose xanthate is salted out and solidi- Cell.
- Method of preparing paper suitable for use as a casing comprising the steps of A. impregnating said paper with an alkali cellulose xanthate solution; B. treating the impregnated paper with lower monoalcohol thereby to regenerate cellulose; and C. washing the resulting paper with water and thereafter drying.
- said lower monoalcohol is selected from the group consisting of ethyl alcohol and methyl alcohol.
- R is a component of a lower alcohol.
- alkali cellulose xanthate solution has a cellulose concentration of 8.5 percent, a Hottenroth number of l 1, and caustic soda content of less than 6.0 percent.
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- Processing Of Meat And Fish (AREA)
Abstract
Finished paper for casings and method of preparing the same. The method comprises impregnating a thin base paper with excess alkali cellulose xanthate solution, subjecting the impregnated paper to an alcohol treatment to produce regenerated cellulose and then water washing and drying the treated paper.
Description
United States Patent r191 Maeno et al.
FINISHED PAPER FOR CASINGS AND PROCESS OF PREPARING SAME Inventors: Hit-00 Maeno, Osaka; Yoshiyuki Matsumoto, Agawa, both of Japan Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha, Osaka, Japan Filed: June 30, 1972 Appl. No.: 268,108
US. Cl. 162/176; 260/217; 106/168; 427/339 Int. Cl 544d l/44 Field of Search 117/157, 166, 62, 62.1, 117/63; 99/176; 260/217 References Cited UNITED STATES PATENTS 6/1964 Underwood 117/157 X Apr. 15, 1975 OTHER PUBLICATIONS Ott, Emil et al., Cellulose & Cellulose Derivatives, Pan 11, 1954, pp. 982, 995, 996, QD321089 1954.
Primary ExaminerMichael R. Lusi'gnan Attorney, Agent, or FirmMoonray Kojima 57] ABSTRACT Finished paper for casings and method of preparing the same. The method comprises impregnating a thin base paper with excess alkali cellulose Xanthate solution, subjecting the impregnated paper to an alcohol treatment to produce regenerated cellulose and then water washing and drying the treated paper.
9 Claims, 4 Drawing Figures PATENTEDAPR 1 51975 3,877,
4 'fllllllllll, v 1 X l IO -3- 7 g I. 9
FIG.2
FINISHED PAPER FOR CASINGS AND PROCESS OF PREPARING SAME BACKGROUND OF INVENTION This invention relates to finished paper for casings and method of preparing same.
For reinforcing the texture of paper made of a cellulose it has been common practice to process the base paper with regenerated cellulose serving as a water absorptive reinforcing binder. One method solidifies and fixes regenerated cellulose at crossing points of the fibers in the base paper. Another method applies regenerated cellulose on the surface of the relatively thick paper so as to set the regenerated cellulose into a form of extremely thin film.
Although such conventional methods encounter no substantial problems in case the amount of regenerated cellulose deposited on the base paper is relatively small, such methods encounter many difficulties when thin Japanese paper of about to gm/m thickness is used as base paper, and regenerated cellulose is de posited thereon in large quantity.
In the latter case, even if the base paper is tough, such as one composed mainly of bast fibres, when it is impregnated with an alkali cellulose xanthate solution, the paper composing fibres are rapidly weakened in their mutual intertwining strength due to swelling caused by alkali. Also the hydrogen bonding force between the cellulose molecules is greatly reduced due to the presence of moisture. Consequently, the original shape of the base paper is deformed under its own weight. It is therefore necessary to treat the paper immediately after coating or impregnation with an alkali cellulose xanthate solution, with an acid salt solution (such as, for example, a mixture solution of sulfuric acid and Glaubers salt) to thereby salt out, solidify and regenerate the deposited alkali cellulose xanthate. The alkali cellulose xanthate provides film-like smooth surface. The aforementioned process is employed in the manufacture of rayon, staple fibres or cellophane.
Cell.
Cell.C-0.Na+ H s0 ce11.+ na so CS According to this formula, only the surface contacted with the acid salt solution is first instantaneously reacted and solidified to form an extremely thin film of regenerated cellulose. This film acts to retard penetration of the treating solution into the nonreacted layer thereby excessively decelerating the cellulose regenerating speed. Also, a large liquid treating tank in which the paper must be immersed for a long time, is required, thus resulting in elevated costs. Furthermore, the film prevents release of gases (such as odoriferous CS thus by-produced during the reaction inside of the film, thereby producing tarnish. There are also byproduced sulfides which make the after-treatment difficult to perform. Because of these undesirable factors, it is highly difficult to solidify and set regenerated cellulose into the fibers in a commercially acceptable manner.
SUMMARY OF INVENTION The present inventors have successfully discovered, after considerable experimentation and study, an effective processing method which is free of the above defects. With the present invention even when a relatively thin base paper, such as about 15 to 30 gm/m is used, it is possible to obtain on an industrial scale, a regenerated cellulose processed paper in which the deposition of dry regenerated cellulose can be from 20 to gm/m or more. It was also found that the invention was operable without producing pollution.
More specifically, according to the invention which encompasses an improved method for producing converted paper to be used for casings, such as used for stuffing sausages, etc, a thin, such as a Japanese paper, base paper made of cellulose is absorbed or impregnated with a large quantity of an alkali cellulose xanthate solution and then subjected to an alcohol treatment to produce regenerated cellulose. Thereafter the thus treated base paper is washed with water and then dried.
Advantageously, the inventive method enables rapid formation of regenerated cellulose which is industrially adaptable. Manufacturing costs are reduced. Also the product may be coated with a large amount of regenerated cellulose and have high wet strength. Moreover, release of waste material which can pollute the environment is avoided.
BRIEF DESCRIPTION OF DRAWING FIG. 1 depicts an illustrative apparatus used in the practice of the invention;
FIG. 2 depicts a casing made of the inventive paper;
FIG. 3 depicts an alternative casing made of the inventive paper; and
FIG. 4 depicts another alternative casing made of the inventive paper.
DETAILED DESCRIPTION OF DRAWING In the present invention, the following chemical reaction is utilized:
c ONa+ ROH- R 0 O-Na Cell.
R is the component part ofthe alcohol used, which alcohol may be a lower alcohol such as, for example, methyl or ethyl. Regeneration of cellulose may be easily effected by the above reaction which produces xanthates from lower alcohol. The substitution reaction is completed almost instantaneously by shifting from left to right in the above formula) quantitatively. it has the advantage that since only alcohol which has higher permeability than the acid salt solution, participates in the reaction, there is by-produced no decomposed substance inside the coating. In contrast, the conventional acid neutralization method produces such decomposed material. Hence, no offensive odors or unwanted residues are produced during the reaction. Accordingly, it is highly simple to remove impurities from the inventive product and to wash the product. It is also possible to dispense with the pre-heating and drying treatments which were indispensible steps in the conventional viscose processing to prevent deformation of the original shape of the base paper before the acid treatment. Furthermore, the present invention is quite noteworthy in that it eliminates pollution.
According to the present invention, it is possibble to dispose of the slight amount of residues or by-products isolated from, but still in the alkali cellulose xanthate solution during the alcohol treatment in a simple manner by washing with water. From the post reaction alcohol treating liquid, alcohol and carbon bisulfide may be recovered. It is desirable that the alcohol used in the reaction have a high purity. Hence, the used alcohol containing s [R- c O'Na,
when re-used after storage, should be neutralized with an acid at a low temperature (at about the temperature of cold water).
Carbon bisulfide (CS which was decomposed and fractionated in the reaction s R ti ONa HCl NaCl cs ROH,
is precipitated due to the difference in specific gravities. Thus, it is possible to separate and recover high purity alcohol from the high boiling point fractionates. Accordingly, the waste liquid may be neutral and, if necessary, the admixtures therein can be readily precipitated away.
Turning now to the drawing, in FIG. 1, there is shown an example of a flat plate processing apparatus in which the present inventive method may be practiced. The base paper 3 is drawn out of a tank 2 containing a highly concentrated alkali cellulose xanthate solution 1. It is successively delivered into a portion of treating tank 5 containing liquid alcohol, such as ethyl or methyl alcohol, on one side of a partition plate 6 contained therein and lifted up from another portion on the opposite side thereof to be further carried to the washing and drying steps not shown. The used alcohol treating liquid in tank 5 is discharged out from the bottom thereof into sealed tank 7 in which the liquid is neutralized with an acid supplied thereinto from a pipe 8. The resulting neutralized liquid is then fed into an alcohol still 10 provided with a steam jacket 9, wherein alcohol is fractionated.
The fractionate is further guided into a cooler 11 wherein the fractionate is cooled and liquified to separate low boiling point CS The C5,, freed alcohol is received in tank 12 from which it is again recycled and supplied into alcohol tank 5 through a pipe 13. Waste fluid or liquid is separated and released away from the bottom of still 10. CS separated in cooler 11 is recovered separately and suitably treated to ensure perfect preclusion or elimination of offensive odors and other possible hazards.
The following is an example embodying the invention method.
Manila hemp, linter, staple fibre available on the open market and powdery (or fibriform) polyvinyl alcohol were blended at ratios of 70, l0, l7 and 3 percent by weight, respectively, and the blend was then subjected to a cylinder paper machine the same as in a foundrinier machine.) to produce a thin Japanese paper having a thickness of about 14 to 20 gm/m by using a normal process. The Japanese paper was then used as base paper 3.
Thereafter, an alkali cellulose xanthate solution, which had been adjusted to cellulose concentration of 8.5 percent, Hottenroth number of 11, and caustic soda content of less than 6.0 percent (the lower the better the results), was supplied into and held in tank 2 of FIG. 1. The base paper 3 was immersed in the solution in the aforementioned manner so that the base paper was sufficiently impregnated with the solution. The amount of impregnation may be varied slightly according to the shape of the paper and the intended use, but usually it is on the order of 700 to 800 gm/m in the case of one time immersion and on the order of 400 gm/m in case of placing two sheets in layers or in case of performing immersing twice. Blending of powdery polyvinyl alcohol in the base paper is to provide reinforcement to the base paper and to enable it to withstand the force of gravity or handling after the impregnation treatment. About 3% blending of the alcohol, as used in this example, provides sufficient endurance even in the case of one time immersion as discussed above.
The impregnated base paper, upon being lifted up from the treating liquid or xanthate solution, is passed around a roll 14 having a compact smooth surface in such a manner that the paper is closely placed on the surface of the roll so as to prevent deformation of the paper shape. It is then charged into treating tank 5 containing ethyl alcohol, wherein the paper is immersed for a duration of several minutes to about ten minutes or longer until the reaction by alcohol is completed. Thereafter, if necessary, the thus treated paper is further subjected to washing with water and drying to thereby complete the entire process.
The cellulose processed paper obtained in accordance with this invention can be effectively used for making casings, such as for packing foodstuff, such as for example, high quality ham, sausages, etc.
Casing materials require high wet strength since they must resist internal pressure exerted during the stuffing process when the casing is wetted. They must also be suitably flexible to withstand contracting and stiffening during smoking operation when the finished article is finally shaped. The cellulose processed paper of this invention easily meets such requirements since the paper is coated with a film of thick regenerated cellulose to provide high wet strength.
The finishing into a cylindrical casing may be achieved in the following manner. The processed paper, for example, may be'joined at opposite ends to form a vertical joint 15 as shown in FIG. 2. In an alternative method, the papermay be formed into a strip 20 and coiled spirally as shown in FIG. 3. In a further alternative method, as illustrated in FIG. 4, the strip shaped paper 21 is first coiled spirally in one direction to form a cylindrical body and then again coiled spirally in the opposite direction to thereby finish the casing into a double coiled cylindrical casing. The overlapped base paper portions of the cylindrical casing may be either joined during the step of alcohol setting, by application of an alkali cellulose xanthate solution or bonded in a separate step by using a suitable adhesive (such as cellulose ester, cellulose ether polyamide, epoxy resin, butyral resin, formal resin or the like).
As above described, the method of the invention has many advantages over the conventional methods in which alkali cellulose xanthate is salted out and solidi- Cell.
fled by an acid salt solution to thereby produce regenerated cellulose. For example, it is possible with the present invention to coat the base paper with a large quantity of regenerated cellulose in a short time and to obtain cellulose processed paper which is relatively free of impurities and has high wet strength. The inventive method produces such paper at low cost and without pollution. The thus obtained paper is especially suited for making of casings.
The foregoing description is intended to be only illustrative of the principles of the invention. Numerous other variations and modifications thereof would be apparent to the worker skilled in the art. All such variations and modifications are to be considered to be within the spirit and scope of the invention.
What is claimed is:
1. Method of preparing paper suitable for use as a casing, comprising the steps of A. impregnating said paper with an alkali cellulose xanthate solution; B. treating the impregnated paper with lower monoalcohol thereby to regenerate cellulose; and C. washing the resulting paper with water and thereafter drying.
2. The method of claim 1, wherein said lower monoalcohol is selected from the group consisting of ethyl alcohol and methyl alcohol.
3. Method of claim 1, wherein said step of treating with said alcohol produces dry regenerated cellulose to an amount of 20 to gmlm and said paper is between 15 to 30 gm/m in thickness.
4. Method of claim 1, wherein said treating step employs the following chemical reaction:
H II
C O'Na ROH-Q R C O-Na Cell.
wherein R is a component of a lower alcohol.
5. Method of claim 1, wherein said alkali cellulose xanthate solution has a cellulose concentration of 8.5 percent, a Hottenroth number of l 1, and caustic soda content of less than 6.0 percent.
6. Method of claim 1, wherein said impregnation of said paper with alkali cellulose xanthate is on the order of 700 to 800 gm/m.
7. Method of claim 1, wherein said paper contains polyvinyl alcohol in an amount of about 3%.
8. Method of claim 1, wherein said treating step is for a period of time sufficient for the reaction of alcohol and the impregnated paper to be completed.
9. A casing paper prepared by the process of claim 1.
Claims (9)
1. METHOD OF PREPARING PAPER SUITABLE FOR USE AS A CASING, COMPRISING THE STEPS OF A. IMPREGNATING SAID PAPER WITH AN ALKALI CELLULOSE XANTHATE SOLUTION; B. TREATING THE IMPREGNATED PAPER WITH LOWER MONO-ALCOHOL THEREBY TO REGNERATED CELLULOSE; AND C. WASHING THE RESULTING PAPER WITH WATER AND THEREAFTER DRYING.
2. The method of claim 1, wherein said lower mono-alcohol is selected from the group consisting of ethyl alcohol and methyl alcohol.
3. Method of claim 1, wherein said step of treating with said alcohol produces dry regenerated cellulose to an amount of 20 to 70 gm/m2, and said paper is between 15 to 30 gm/m2 in thickness.
4. Method of claim 1, wherein said treating step employs the following chemical reaction:
5. Method of claim 1, wherein said alkali cellulose xanthate solution has a cellulose concentration of 8.5 percent, a Hottenroth number of 11, and caustic soda content of less than 6.0 percent.
6. Method of claim 1, wherein said iMpregnation of said paper with alkali cellulose xanthate is on the order of 700 to 800 gm/m2.
7. Method of claim 1, wherein said paper contains polyvinyl alcohol in an amount of about 3%.
8. Method of claim 1, wherein said treating step is for a period of time sufficient for the reaction of alcohol and the impregnated paper to be completed.
9. A casing paper prepared by the process of claim 1.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2928872A GB1396125A (en) | 1972-06-22 | 1972-06-22 | Finished paper for casings and process of preparing the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US3877968A true US3877968A (en) | 1975-04-15 |
Family
ID=10289164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US268108A Expired - Lifetime US3877968A (en) | 1972-06-22 | 1972-06-30 | Finished paper for casings and process of preparing same |
Country Status (4)
Country | Link |
---|---|
US (1) | US3877968A (en) |
CA (1) | CA1005205A (en) |
DE (1) | DE2233621A1 (en) |
GB (1) | GB1396125A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4328838A (en) * | 1977-10-19 | 1982-05-11 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Thick and tough cellophane for casings and method of preparing the same |
US11142463B2 (en) * | 2017-05-12 | 2021-10-12 | Lg Chem, Ltd. | Method for producing silica aerogel blanket and silica aerogel blanket produced thereby |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3135613A (en) * | 1959-08-17 | 1964-06-02 | Union Carbide Corp | Impregnated paper web and method of making sausage casings therefrom |
US3335023A (en) * | 1966-05-25 | 1967-08-08 | Douglas J Bridgeford | Reinforced or coated paper produced by treatment of paper fibers with decausticized solution of a polymeric alcohol xanthate |
US3429735A (en) * | 1967-04-10 | 1969-02-25 | Tee Pak Inc | High wet strength webs impregnated with polymeric alcohol |
US3433663A (en) * | 1964-05-04 | 1969-03-18 | Union Carbide Corp | Impregnated porous paper webs and method of obtaining same |
US3475270A (en) * | 1966-10-24 | 1969-10-28 | Fmc Corp | Process of preparing wet strength paper containing regenerated cellulose formed in situ therein |
US3511751A (en) * | 1967-05-29 | 1970-05-12 | Toyo Tire & Rubber Co | Method of modifying cellulose xanthate paper prior to in situ regeneration by embossing and product thereby |
-
1972
- 1972-06-22 GB GB2928872A patent/GB1396125A/en not_active Expired
- 1972-06-30 US US268108A patent/US3877968A/en not_active Expired - Lifetime
- 1972-07-04 DE DE2233621A patent/DE2233621A1/en active Pending
- 1972-07-05 CA CA146,406A patent/CA1005205A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3135613A (en) * | 1959-08-17 | 1964-06-02 | Union Carbide Corp | Impregnated paper web and method of making sausage casings therefrom |
US3433663A (en) * | 1964-05-04 | 1969-03-18 | Union Carbide Corp | Impregnated porous paper webs and method of obtaining same |
US3335023A (en) * | 1966-05-25 | 1967-08-08 | Douglas J Bridgeford | Reinforced or coated paper produced by treatment of paper fibers with decausticized solution of a polymeric alcohol xanthate |
US3475270A (en) * | 1966-10-24 | 1969-10-28 | Fmc Corp | Process of preparing wet strength paper containing regenerated cellulose formed in situ therein |
US3429735A (en) * | 1967-04-10 | 1969-02-25 | Tee Pak Inc | High wet strength webs impregnated with polymeric alcohol |
US3511751A (en) * | 1967-05-29 | 1970-05-12 | Toyo Tire & Rubber Co | Method of modifying cellulose xanthate paper prior to in situ regeneration by embossing and product thereby |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4328838A (en) * | 1977-10-19 | 1982-05-11 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Thick and tough cellophane for casings and method of preparing the same |
US11142463B2 (en) * | 2017-05-12 | 2021-10-12 | Lg Chem, Ltd. | Method for producing silica aerogel blanket and silica aerogel blanket produced thereby |
Also Published As
Publication number | Publication date |
---|---|
DE2233621A1 (en) | 1974-01-24 |
CA1005205A (en) | 1977-02-15 |
GB1396125A (en) | 1975-06-04 |
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