CN113016850A - Method for producing collagen casing by using pigskin - Google Patents
Method for producing collagen casing by using pigskin Download PDFInfo
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- CN113016850A CN113016850A CN202110380442.3A CN202110380442A CN113016850A CN 113016850 A CN113016850 A CN 113016850A CN 202110380442 A CN202110380442 A CN 202110380442A CN 113016850 A CN113016850 A CN 113016850A
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- 102000008186 Collagen Human genes 0.000 title claims abstract description 61
- 108010035532 Collagen Proteins 0.000 title claims abstract description 61
- 229920001436 collagen Polymers 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000010985 leather Substances 0.000 claims abstract description 102
- 238000005554 pickling Methods 0.000 claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 46
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 46
- 239000004571 lime Substances 0.000 claims abstract description 46
- 238000005406 washing Methods 0.000 claims abstract description 27
- 239000004367 Lipase Substances 0.000 claims abstract description 22
- 102000004882 Lipase Human genes 0.000 claims abstract description 22
- 108090001060 Lipase Proteins 0.000 claims abstract description 22
- 235000019421 lipase Nutrition 0.000 claims abstract description 22
- 102000004190 Enzymes Human genes 0.000 claims abstract description 21
- 108090000790 Enzymes Proteins 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 11
- 150000007524 organic acids Chemical class 0.000 claims abstract description 11
- 230000020477 pH reduction Effects 0.000 claims abstract description 8
- 238000004898 kneading Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 23
- 108091005658 Basic proteases Proteins 0.000 claims description 3
- 239000004480 active ingredient Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 32
- 241000283690 Bos taurus Species 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 7
- 235000013580 sausages Nutrition 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000004519 grease Substances 0.000 description 6
- 238000009941 weaving Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000009940 knitting Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000009938 salting Methods 0.000 description 3
- 235000013372 meat Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000004429 Calibre Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000015232 fried sausages Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22C—PROCESSING MEAT, POULTRY, OR FISH
- A22C13/00—Sausage casings
- A22C13/0026—Chemical treatment of natural gut
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22C—PROCESSING MEAT, POULTRY, OR FISH
- A22C13/00—Sausage casings
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22C—PROCESSING MEAT, POULTRY, OR FISH
- A22C13/00—Sausage casings
- A22C2013/0096—Sausage casings cellulosic
Abstract
The invention relates to the technical field of casing production, in particular to a method for producing a collagen casing by using pigskin. The invention comprises the following steps: (1) cutting pigskin, putting the pigskin into a rotary drum, and then spraying lime solution to wrap the pigskin; (2) bagging the wrapped leather material, and placing the leather material in a leather pickling warehouse for pickling; (3) washing the pickled leather with water, adding water into the leather in a rotary drum, adding alkaline lipase, and rotating the rotary drum; (4) adding lime for rotation, adding an emulsifier for rotation, adding an enzyme-containing liming auxiliary agent for pickling; (5) washing with water, adding organic acid for acidification, and washing with water; (6) cutting the material obtained in the step (5) into particles and rolling; (7) and mixing and kneading the rolled materials and auxiliary materials, extruding, blowing and post-treating to obtain the collagen casing. The invention has scientific and reasonable design, expands the range of the collagen casing raw materials, is not limited to cow leather, and reduces the production cost on the basis of ensuring the product quality.
Description
Technical Field
The invention relates to the technical field of casing production, in particular to a method for producing a collagen casing by using pigskin.
Background
At present, the production of the collagen casing is mainly to use cowhide to extract collagen fiber from the cowhide, mix and knead the collagen fiber and auxiliary materials, and extrude and weave the mixture into tubular casing through a spray head. Collagen casings produced from pigskin are not currently visible in the market, on the one hand because the pigskin has short fibers, poor tightness and less fiber strength than cow skin; on the other hand, because the fat content of the pigskin is higher than that of the cowhide, the extraction of fiber is influenced, so even though the pigskin has the advantage of price over the cowhide, a sausage casing manufacturer does not use the pigskin.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for producing the collagen casing by using the pigskin overcomes the defects of the prior art, has scientific and reasonable design, expands the range of raw materials of the collagen casing, is not limited to cow leather, and reduces the production cost on the basis of ensuring the product quality.
The method for producing the collagen casing by using the pigskin comprises the following steps:
(1) cutting pigskin into square small blocks with side length of 10-15cm, putting the small blocks into a rotary drum, then spraying lime solution, and uniformly wrapping the small blocks in the rotary drum, wherein 200kg of lime is sprayed on each ton of pigskin;
(2) bagging the leather materials wrapped in the step (1), and placing the leather materials in a leather pickling warehouse for pickling;
(3) after the dry pickling is finished, washing the pickled leather twice by water, adding water into the leather in a rotary drum, adding alkaline lipase, and rotating the rotary drum for 2 hours;
(4) adding lime, rotating for 1 hour, adding emulsifier, rotating for 0.5 hour, adding enzyme-containing liming auxiliary agent, and pickling;
(5) washing with water, adding organic acid for acidification, and washing with water;
(6) cutting the material obtained in the step (5) into particles and rolling;
(7) and mixing and kneading the rolled materials and auxiliary materials, extruding, blowing and post-treating to obtain the collagen casing.
Preferably, in the step (1), lime solution is sprayed according to 3-8% of the weight of the leather. The mass concentration of the lime solution is 50%.
Preferably, in the step (2), the pickling temperature is 10-15 ℃, and the pickling lasts for 7 days.
Because the fibers of pigskin are different from those of cow leather, the amount of lime is much less when treating the pigskin than when treating cow leather; the temperature for pickling the skin is much lower than that of the cow leather, and no caustic soda is added.
Preferably, in the step (3), the addition amount of the water is 1-2 times of the weight of the initial leather, and the addition amount of the alkaline lipase is 0.1-1% of the weight of the initial leather.
Preferably, in the step (4), the addition amount of the lime is 3% of the weight of the initial leather material, and the addition amount of the enzyme-containing liming aid is 0.1-1% of the weight of the initial leather material.
The initial leather is the leather which is not divided in the step (1).
Preferably, in the step (4), the pickling temperature is 20-30 ℃ and the time is 1-2 days.
Preferably, the enzyme-containing liming aid is NOWOLASE XL, and the active ingredients thereof are alkaline protease and liming accelerator.
In a machine head adopted in blowing, threads on the inner walls of two sides of a feeding hole are woven in a crossed mode, and the weaving angle is almost right-angled. The machine head is in a circular ring shape, and materials are extruded from a circular ring gap to form a straight cylinder shape. The size of the circular ring gap is 30-50 microns. The threads of the outer wall of the central shaft and the threads of the outer wall of the outer ring are crossed to weave collagen fibers.
The traditional method for treating the cowhide is a dry pickling method, namely the cowhide is wrapped with ash and caustic soda, and the more novel method for treating the cowhide is a water pickling method, namely an enzyme method. In the invention, the pigskin is treated by a method of combining dry pickling and water pickling. However, the dry-pickling and water-pickling processes in the pigskin treatment are not completely equivalent to the prior art methods of dry-pickling and water-pickling the cattle hide.
In the dry pickling process, the main purposes of the process treatment in the step (1) and the step (2) are to make the leather material initially expand under the action of lime and disperse fibers, and on the other hand, the leather material grease is firstly saponified by utilizing the lime. After the dry pickling is finished, the pickled leather is washed by water, so that the leather is slightly expanded, the surface grease removing effect is good, and the water pickling process is carried out on the basis of slight expansion of the leather.
In the water pickling process, water and alkaline lipase are added in the step (3) to further remove fat on the surface of the leather and fat in the leather, and the lipase is easier to permeate into the leather after the leather is subjected to early dry pickling expansion. After the action of alkaline lipase, lime is added for rotation, then emulsifier (Tween) is added for rotation, and then enzyme-containing liming auxiliary agent is added for water pickling, further expansion and removal of cellularity.
In the water pickling treatment stage, alkaline lipase must be added firstly for pre-action in the feeding sequence, otherwise, the obtained leather is black and not bright, and the specific reason is that other substances are added firstly for action, so that the fat removal effect is influenced, the fat is incompatible with water, the collagen fibers swell and absorb water, and the turbidity and the brightness are easily low.
And after the pickling with water is finished, washing with water, acidifying, washing with water again, removing collagen fiber interstitium, and keeping collagen fiber. The extracted collagen fiber is mixed and kneaded with auxiliary materials and is combed again by an extruder, the obtained collagen mass is blown with casing, the casing blowing head is provided with a feeding port, the threads on the inner walls of the two sides of the feeding port are selected for cross knitting, and the knitting angle is almost right-angled knitting to increase the mechanical strength. The finished sausage casing is tested, and the caliber of 15-20 caliber in the current experiment is almost no different from that of the collagen sausage casing produced by cow leather in the aspect of mechanical property. In addition, it has been surprisingly found that when the casing is applied to a fried sausage, an unexpected frying effect is obtained, and the frying performance is superior to that of a bovine hide collagen casing. Probably because the pig casing has fine fiber and much exposed fiber charge, and has better bonding force with the meat stuffing, or because the content of residual grease is still higher than that of the bovine collagen fiber even if the pig collagen fiber is subjected to dry pickling and water pickling, and the casing with high grease content has stronger affinity with the meat stuffing.
Compared with the prior art, the invention has the following beneficial effects:
the invention has scientific and reasonable design, expands the range of the raw materials of the collagen casing, is not limited to cow leather, and reduces the production cost on the basis of ensuring the product quality; in addition, when the pigskin collagen casing is applied to frying, the effect is superior to that of the cow skin collagen casing.
Drawings
FIG. 1 shows a skin material pickled in comparative example 3.
Detailed Description
The present invention is further illustrated by the following examples.
The specific types of alkaline lipase, emulsifier, enzyme-containing liming aid, organic acids used in the examples are as follows:
alkaline lipase: novicent great;
emulsifier: tween 80;
enzyme-containing liming aid: NOWOLASE XL;
organic acid: and (4) citric acid.
Example 1
A method for producing collagen casing by using pigskin comprises the following steps:
(1) cutting pigskin (5 tons) into square small blocks with side length of 10cm, putting the small blocks into a rotary drum, spraying lime solution, and uniformly wrapping in the rotary drum; spraying lime solution according to 3% of the weight of the leather, wherein the mass concentration of the lime solution is 50%;
(2) bagging the leather material wrapped in the step (1), and placing the leather material in a leather pickling warehouse for pickling for 7 days at the pickling temperature of 12 +/-2 ℃;
(3) after the dry pickling is finished, washing the pickled leather twice by using water, adding water into the leather in a rotary drum, adding alkaline lipase, and rotating the rotary drum for 2 hours, wherein the addition amount of the water is 1 time of the weight of the initial leather, and the addition amount of the alkaline lipase is 1 percent of the weight of the initial leather;
(4) adding lime, rotating for 1 hour, adding an emulsifier, rotating for 0.5 hour, adding an enzyme-containing liming aid, and salting, wherein the addition amount of the lime is 3% of the weight of the initial leather material, the addition amount of the enzyme-containing liming aid is 1% of the weight of the initial leather material, the salting temperature is 20 ℃, and the salting time is 1 day;
(5) washing with water, adding organic acid for acidification, and washing with water;
(6) cutting the obtained leather into particles, and rolling;
(7) and (4) mixing the collagen fibers extracted in the step (6) with auxiliary materials, kneading, extruding, blowing and post-treating to obtain the collagen casing.
In a machine head adopted in blowing, threads on the inner walls of two sides of a feeding hole are woven in a crossed mode, and the weaving angle is almost right-angled. The machine head is in a circular ring shape, and materials are extruded from a circular ring gap to form a straight cylinder shape. The size of the circular ring gap is 30 microns. The threads of the outer wall of the central shaft and the threads of the outer wall of the outer ring are crossed to weave collagen fibers.
Example 2
A method for producing collagen casing by using pigskin comprises the following steps:
(1) cutting pigskin (5 tons) into square small blocks with the side length of 15cm, putting the small blocks into a rotary drum, spraying lime solution, and uniformly wrapping the small blocks in the rotary drum; spraying lime solution according to 8% of the weight of the leather, wherein the mass concentration of the lime solution is 50%;
(2) bagging the leather material wrapped in the step (1), and placing the leather material in a leather pickling warehouse for pickling for 7 days at the pickling temperature of 13 +/-1 ℃;
(3) after the dry pickling is finished, washing the pickled leather twice by using water, adding water into the leather in a rotary drum, adding alkaline lipase, and rotating the rotary drum for 2 hours, wherein the addition amount of the water is 2 times of the weight of the initial leather, and the addition amount of the alkaline lipase is 0.3 percent of the weight of the initial leather;
(4) adding lime, rotating for 1 hour, adding an emulsifier, rotating for 0.5 hour, adding an enzyme-containing liming aid, and pickling, wherein the adding amount of the lime is 3% of the weight of the initial leather material, the adding amount of the enzyme-containing liming aid is 0.4% of the weight of the initial leather material, the pickling temperature is 20 ℃, and the pickling time is 2 days;
(5) washing with water, adding organic acid for acidification, and washing with water;
(6) cutting the obtained leather into particles, and rolling;
(7) and (4) mixing the collagen fibers extracted in the step (6) with auxiliary materials, kneading, extruding, blowing and post-treating to obtain the collagen casing.
In a machine head adopted in blowing, threads on the inner walls of two sides of a feeding hole are woven in a crossed mode, and the weaving angle is almost right-angled. The machine head is in a circular ring shape, and materials are extruded from a circular ring gap to form a straight cylinder shape. The size of the circular ring gap is 50 microns. The threads of the outer wall of the central shaft and the threads of the outer wall of the outer ring are crossed to weave collagen fibers.
Example 3
A method for producing collagen casing by using pigskin comprises the following steps:
(1) cutting pigskin (5 tons) into square small blocks with the side length of 12cm, putting the small blocks into a rotary drum, spraying lime solution, and uniformly wrapping the small blocks in the rotary drum; spraying lime solution according to 5% of the weight of the leather, wherein the mass concentration of the lime solution is 50%;
(2) bagging the leather material wrapped in the step (1), and placing the leather material in a leather pickling warehouse for pickling for 7 days at the pickling temperature of 14 +/-1 ℃;
(3) after the dry pickling is finished, washing the pickled leather twice by using water, adding water into the leather in a rotary drum, adding alkaline lipase, and rotating the rotary drum for 2 hours, wherein the addition amount of the water is 1 time of the weight of the initial leather, and the addition amount of the alkaline lipase is 0.1 percent of the weight of the initial leather;
(4) adding lime, rotating for 1 hour, adding an emulsifier, rotating for 0.5 hour, adding an enzyme-containing liming aid, and pickling, wherein the adding amount of the lime is 3% of the weight of the initial leather material, the adding amount of the enzyme-containing liming aid is 0.1% of the weight of the initial leather material, the pickling temperature is 25 ℃, and the pickling time is 1 day;
(5) washing with water, adding organic acid for acidification, and washing with water;
(6) cutting the obtained leather into particles, and rolling;
(7) and (4) mixing the collagen fibers extracted in the step (6) with auxiliary materials, kneading, extruding, blowing and post-treating to obtain the collagen casing.
In a machine head adopted in blowing, threads on the inner walls of two sides of a feeding hole are woven in a crossed mode, and the weaving angle is almost right-angled. The machine head is in a circular ring shape, and materials are extruded from a circular ring gap to form a straight cylinder shape. The size of the annular gap is 35 microns. The threads of the outer wall of the central shaft and the threads of the outer wall of the outer ring are crossed to weave collagen fibers.
Comparative example 1
(1) Cutting pigskin (5 tons) into square small blocks with side length of 10cm, putting the small blocks into a rotary drum, spraying lime solution, and uniformly wrapping in the rotary drum; spraying lime solution according to 3% of the weight of the leather, wherein the mass concentration of the lime solution is 50%;
(2) bagging the leather material wrapped in the step (1), and placing the leather material in a leather pickling warehouse for pickling for 7 days at the pickling temperature of 12 +/-2 ℃;
(3) after the dry pickling is finished, washing the pickled leather twice by using water, adding water into the leather in a rotary drum, adding lime, and rotating the rotary drum for 1 hour, wherein the adding amount of the water is 1 time of the weight of the initial leather, and the adding amount of the lime is 3 percent of the weight of the initial leather;
(4) continuously adding the enzyme-containing liming assistant, rotating for 1 hour, adding alkaline lipase, and continuously rotating for 0.5 hour, and adding the emulsifier. The adding amount of the enzyme-containing liming auxiliary agent is 1 percent of the weight of the initial leather material; the adding amount of the alkaline lipase is 1 percent of the weight of the initial leather; the pickling temperature is 20 ℃, and the pickling is carried out while observing until the leather is completely pickled, and the pickling time is 3 days.
(5) Washing with water, adding organic acid for acidification, and washing with water;
(6) cutting the obtained leather into particles, and rolling;
(7) and (4) mixing the collagen fibers extracted in the step (6) with auxiliary materials, kneading, extruding, blowing and post-treating to obtain the collagen casing.
In a machine head adopted in blowing, threads on the inner walls of two sides of a feeding hole are woven in a crossed mode, and the weaving angle is almost right-angled. The machine head is in a circular ring shape, and materials are extruded from a circular ring gap to form a straight cylinder shape. The size of the circular ring gap is 30 microns. The threads of the outer wall of the central shaft and the threads of the outer wall of the outer ring are crossed to weave collagen fibers.
Compared with example 1, in comparative example 1, lipase was not added, and under the same curing conditions, the skin material was not cured for 1 day in step (4), and the curing time was extended for 2 days, so that the skin material was found to be cured thoroughly, but was dark, and mainly had much grease remained.
It can be shown that if the order of addition is not correct, not only is the efficiency of skin curing low, but also the appearance of the skin material is dark, and the clarity of the prepared casing is not as good as that of example 1.
Comparative example 2
(1) Cutting pigskin (5 tons) into square small blocks with side length of 10cm, putting the small blocks into a rotary drum, spraying lime solution, and uniformly wrapping in the rotary drum; spraying lime solution according to 3% of the weight of the leather, wherein the mass concentration of the lime solution is 50%;
(2) bagging the leather material wrapped in the step (1), and placing the leather material in a leather pickling warehouse for pickling, wherein the pickling temperature is 12 +/-2 ℃, the pickling time is 7-30 days, and the observation is carried out while pickling;
(3) washing with water, and acidifying with organic acid.
And (3) slightly tapping the surface of the pickled leather, washing with water, and acidifying, wherein the surface fibers are gelatinized and the internal collagen fibers are not expanded when the pickled leather is acidified. The next process cannot be performed. During the lime curing treatment, even if the fibers on the surface of the lime-coated leather are rotten to generate glue, the interior of the lime-coated leather is not cured completely. Firstly because the pigskin collagen fiber is shorter, toughness is relatively poor, compares the cow hide, and the ash pickling causes surface excess treatment easily, secondly because the penetration of lime has been influenced to pigskin fat content, causes the surface fibre to have destroyed, and internal fiber still does not expand the state.
Comparative example 3
(1) Cutting pigskin (5 tons) into square small blocks with the side length of 15cm, putting the small blocks into a rotary drum, adding water into the rotary drum, adding alkaline lipase, and rotating the rotary drum for 2 hours, wherein the addition amount of the water is 2 times of the weight of the initial leather, and the addition amount of the alkaline lipase is 0.3 percent of the weight of the initial leather;
(2) adding lime, rotating for 1 hour, adding an emulsifier, rotating for 0.5 hour, adding an enzyme-containing liming aid, and pickling, wherein the adding amount of the lime is 3% of the weight of the initial leather material, the adding amount of the enzyme-containing liming aid is 0.4% of the weight of the initial leather material, the pickling temperature is 20 ℃, the pickling time is 5-10 days, and the leather material is observed while pickling.
(3) Washing with water, adding organic acid for acidification, and washing with water;
when the pigskin is directly pickled by water, the finally obtained pigskin is found to be black, and probably the pigskin has more fat and the grease is oxidized. As shown in fig. 1, the sausage casing cannot be prepared by further performing the remaining steps. The obtained sausage casing appearance does not meet the national standard. The national standard requires that the sausage casing should not have other color spots or black spots.
The collagen fibers and the casings obtained from the skins treated by the process of the present invention and the comparative example were subjected to the relevant tests, respectively, and the results are shown in tables 1 and 2.
TABLE 1 collagen fiber index comparison
TABLE 2 comparison of indicators for collagen casings of the same calibre
From the above data, it can be seen that the collagen casings obtained in examples 1-3 have no significant difference in the index from the collagen casing produced from cowhide, but the strength of the products obtained in the comparative examples is slightly inferior to that of the other collagen casings in terms of the mechanical property index, and may be due to insufficient fat removal, which affects the later crosslinking of the casings, and also due to poor transparency of the casings, which makes the appearance of the finished sausages made using the casings less bright.
Claims (10)
1. A method for producing collagen casing by using pigskin is characterized in that: the method comprises the following steps:
(1) cutting pigskin, putting the pigskin into a rotary drum, and then spraying lime solution to wrap the pigskin;
(2) bagging the leather materials wrapped in the step (1), and placing the leather materials in a leather pickling warehouse for pickling;
(3) washing the pickled leather with water, adding water into the leather in a rotary drum, adding alkaline lipase, and rotating the rotary drum;
(4) adding lime for rotation, adding an emulsifier for rotation, adding an enzyme-containing liming auxiliary agent for pickling;
(5) washing with water, adding organic acid for acidification, and washing with water;
(6) cutting the material obtained in the step (5) into particles and rolling;
(7) and mixing and kneading the rolled materials and auxiliary materials, extruding, blowing and post-treating to obtain the collagen casing.
2. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (1), lime solution is sprayed according to 3-8% of the weight of the leather.
3. A method for producing collagen casing using pigskin according to claim 1 or 2, characterized in that: in the step (1), the mass concentration of the lime solution is 50%.
4. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (2), the pickling temperature is 10-15 ℃, and the pickling is carried out for 7 days.
5. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (3), the addition amount of water is 1-2 times of the weight of the initial leather.
6. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (3), the adding amount of the alkaline lipase is 0.1-1% of the weight of the initial leather.
7. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (4), the addition amount of lime is 3% of the weight of the initial leather.
8. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (4), the adding amount of the alkaline protease is 0.1-1% of the weight of the initial leather material.
9. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (4), the pickling temperature is 20-30 ℃, and the time is 1-2 days.
10. A method of producing collagen casing using pigskin according to claim 1 wherein: in the step (4), the enzyme-containing liming aid is NOWOLASE XL, and the active ingredients of the enzyme-containing liming aid are alkaline protease and liming accelerator.
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