DE1298280B - Process for the production of molded articles, in particular sausage casings, from collagen-containing material - Google Patents

Description

extremely essential for the shelf life of the sausage. Also, the artificial bowels don't have that good sliding properties, which is essential for sausage production in large sausage machines.

There are also other processes for the production of various shaped articles from collagen-containing Material known. In all of these processes, the starting material is shredded before it is deformed.

is reproduced. In the case of untreated collagen tissue, the yield point and the breaking point are too close to each other to carry out cold deformation, so the permanent deformability is too small, as is also shown in FIG. 6, curve A. It is therefore necessary to pre-treat the collagen tissue. The Dauerverformbarkeit is ω, depends on the duration t OCE load represented in the curve. F i g. 2 gives the course of the yield point α and to apply, which are made from swollen, frayed skin ίο the breaking point b in relation to the time during fall. For this it is necessary to treat the material to be processed in an alkaline bath with NaOH as electrolyte. Beef intestine was used here so that it was then passed through (appendix) a Dutch cattle under high pressure. The pH ring nozzles can be pressed to obtain a tubular shape- was always 6 pH units above the isoelectric total. The material is then kept for 15 point IP (IP = 5.5 to 7.2 pH = IP + 6), in a tanning bath or in a cured Gerbraum The temperature was 15 ⁰ C. The b breaking point and subsequently dried. These artificial intestines, as a result of the ongoing decomposition of the me, have the disadvantage that a molecule is constantly falling off in order to produce them. The maximum distance (b - a) a complicated procedure is required and that it is between the yield point and the breaking point is against the membrane effect of natural casings with Δ σ. The breaking strength is in this sit. This effect is about 75% of the initial value for smoking and also point. The maximal

Permanent deformability ω is 14% after one minute of loading and 18% after one hour of loading (see FIG. 6, curve B). F i g. 3 and 6, curve C, show analogous values in the case of an acid treatment (pH = IP - 4.8) of a strip of skin on the head of a Dutch cattle. The electrolyte used was CH ₃ COOH at a temperature of 15 ° C. The decomposition of the collagen

According to one method, the fiberized material is 30 molecules is cheaper here. In addition to a somewhat elongated, ren and more pronounced Δ σ , the breakage is now about 85%, in particular sausage casings, made of natural, undamaged, according to the invention. 4 and 6, curve D, show the results of a fibrous, collagen-containing material, such as intestines, thermal pretreatment in the case of glue blisters or skin waste, with measurement of the flow temperature T = 6TC. One used here one and the breaking point of the material and determination of the intestine of a Dutch cattle. The pH value of the difference is obtained from the fact that the material corresponded to the isoelectric point. The molecule in a well-known way of thermal, chemical decomposition sets in immediately and proceeds rapidly. In the most favorable case and / or subjected to enzymatic treatment, Δ σ is as large as possible, in which the collagen molecules or crystallites 40 have the breaking strength only 50% 80% is terminated by treatment if the difference between subsequent tanning with substances containing aldehydes improves the flow and fracture limit of the treated material.

is practically maximum, whereupon the thus treated F i g. 5 and 6, curve E, show the results

Material deformed in a known manner and, if necessary, enzymatic pretreatment with the help of a pineapple case is hardened by tanning. juice. (Such a method is known per se.)

Another pig intestine of Chinese origin was used. Δ σ is 70% of the original breaking strength. An improvement in the breaking strength by post-treatment in a tanning bath does not seem to be possible with this pretreatment. An oxidative aftertreatment according to the above known method leads to a complete destruction of the tissue after such a treatment

can. For an explanation of the method according to FIG. However, this pretreatment is suitable Invention, the drawing is used in the F i g. 1 specifically for the production of extremely thin membranes of an extremely homogeneous and millable quality.

The various pre-treatment methods can

Dutch pig, shows. From zero to 60, also combined with good results The products manufactured can also

be dried in a later stage.

The cold deformation can be done by pressing, rolling, drawing and the like Equipment savings also mean a significant improvement in quality is achieved.

It is important in the method according to the invention, the pretreatment to a suitable and interrupt a predetermined time, which are determined by measuring the yield point and breaking point

Curve of the characteristic dependence of tension σ and elongation ε for collagen tissue that has not yet been digested, originating from the bladder of a

an elastic strain occurs at the yield point α

instead, which is represented by ε = -V- · 100%. Ό

After relaxation, the collagen tissue gradually takes on its old shape again, but above the flow limit α up to the breaking point b there is one

ti

Permanent deformation takes place, which is determined by ω = -V- ■ 100%

• η

example 1

A sample of a bovine intestine was kept at 15 ° C for 4 days in a sodium hydroxide bath with a pH value of 12, whereupon a tensile stress of 0.7 kg / mm ^{2 was applied to the ends of the intestine.}

was laid. The intestine was here under appropriate Taper stretched 17% and could be used as a sausage casing.

Example 2

A sample of a thread cut from cattle hide was held at the gluing ^{temperature of about 67 °} C. for about 30 seconds at a pH value corresponding to its isoelectric point and then stretched by 10% by applying a tensile stress of about 0.45 kg / mm ^2. The breaking strength of the thread, which was reduced by the heat treatment, could be increased again by subsequent aldehyde tanning.

Example 3

A sample of a pig intestine was prepared according to that described in U.S. Patent 2,314,313 Way subjected to an enzymatic pretreatment with the help of pineapple juice and then after Cut open rolled into a thin membrane.

Claims (1)

Claim: Process for the production of moldings, in particular sausage casings, from natural, non-fiberized, collagen-containing material, such as intestines, blisters, or skin debris, taking measurement of the Yield and fracture limit of the material and determination of their difference, characterized by that the material is subjected to a thermal, chemical and / or enzymatic treatment in a known manner becomes, in which the collagen molecules or crystallites can be displaced relative to one another, and that the treatment is stopped when the difference between the yield point and the breaking point of the treated Material is practically maximum, whereupon the material treated in this way is deformed in a known manner and optionally hardened by tanning. 1 sheet of drawings