FR2667867A1 - PROCESS FOR PRODUCING A TUBULAR ENVELOPE WITH IMPROVED PELABILITY - Google Patents

Abstract

The invention relates to a process for the manufacture of a tubular casing based on regenerated cellulose with improved peelability by forming a viscose solution into a tubular casing, the action of a precipitating agent and the usual subsequent treatment. invention, the dispersion of at least one polyethylene wax is added to the viscose solution, mixed and optionally placed under vacuum. Applications: manufacture of casings for sausages.

Description

The invention relates to a method for the manufacture of envelopes

  tubular packaging, preferably envelopes of food products, improved peelability ("Easy-peel"). Tubular envelopes, in particular of cellulose

  regenerated, are often used as conditioning

  for food products and are used in large quantities for the production of processed meat products, such as sausages. If these food casings are used without treatment, it is observed that, in the manufacture of sausages, cooked meat, in particular in the case of

  boiled sausage, may adhere too strongly to the skin.

  quence, when the sausage is peeled, remains of flesh are torn from the sausage and this prevents guaranteeing slices of

  sausage of constant size for garnishes.

  In raw sausages, sausage skin does not adhere sufficiently to the flesh and there is a partial separation of the skin, often related to training.

  undesirable of an oil film and / or mold development

  sure about the sausage stuff.

  Because of its separation, the food product envelope

  silage does not contract further with the filling material, so

  that the sausage appears creased and stunted.

  To overcome these disadvantages, it is usual to

  provide the inside of tubular skins for food products

  regenerated cellulose of a water-soluble cellulose ether coating, a partial fatty acid ester of sorbitan or mannitol, a water-soluble polyalkylene glycol ether or mineral oil or silicone oil, see US-A-2,558,042, US-A-2,588,367, US-A-3,158,492, US-A-3,898,348 and US Pat.

  US-A-4,137,947 in US-A-2,988,451, polyvinyl alcohol has been mentioned.

  pyrrolidone in combination with CMC, in US-A-3,383,223 glutaraldehyde. DE-A-34 09 746 discloses inter alia the use of rosin, US-A-4,463,778 the use of vinyl acetate polymers. According to EP-A-006 551, alcohol is used. Polyvinyl and microcrystalline cellulose in combination with a mixture of triglycerides are furthermore mentioned: starch, copper complexes of fatty acids, non-reactive dialkylpolysiloxane and starch ethers in EP-AO 101 892, DE- A-34 47 026 and

DE-A-28 41 850.

  In EP-A-0 109 611 and DE-A-32 42 655, in addition

  a cellulose ether and / or a starch ether, a wax and possibly

an oil.

  These internal primers lead to low adhesion

  However, there are some disadvantages. There is an increased deposit of oil and fat between the flesh and the casing, and the casings tend to become detached.

  moldy in the interspaces in the raw sausage.

  The envelope does not contract with the flesh and becomes wrinkled and shriveled Some coatings cause the fragility of

  hose and thus bursting during tightening and filling.

  The object of the present invention was therefore to

  provision of a tubular packaging casing, preferably

  a tubular casing for foodstuffs, in particular regenerated cellulose, which, because of its primer

  special, lowers considerably in the sausage to boil the

  the sausage skin and the sausage mass provided for this type of casing and has a greater separation effect, so that the casing of the sausage can be detached without exerting a high force In the sausage raw, it must prevent detachment during ripening and prevent oil and grease deposits. In addition, the primer

  must not weaken the envelope material, so that these envelopes

  food products can be processed without

prob Leme in garnished products.

  The subject of the invention is a process for the manufacture

  of a tubular casing made from regenerated cellulose of

  improved ability by forming a viscose solution into a tubular casing, action of a precipitating medium and usual after-treatment, characterized in that the dispersion of at least one polyethylene wax is added to the viscose solution. , we

  mixture and possibly evacuated.

  In a preferred embodiment, the viscose containing the polyethylene wax is cast through an annular slit nozzle according to usual technical methods. In a particularly preferred embodiment, reinforced regenerated cellulose tubular casings are made. The fiber hose with viscose containing polyethylene wax The manufacture of suitable solutions of viscose is described, for example, in US-A-3,208,234. The impregnation and the coating of fiber pipes with the viscose solution is described, for example,

in GB-A-1,336,850.

  US-A-3,833,021 and US-A-1,902,529 disclose the introduction of

  polyethylene oxide wax in viscose using solvents to obtain a matte appearance of the envelope. But neither does an improvement in

  peelability, see comparative example.

  The tubular casing manufactured according to the invention is in particular a skin of food product, in particular a

sausage skin.

  The term "polyethylene wax" to be used according to the invention means a polyethylene having a mean molecular weight of 1,000 to 7,000 g / mol, preferably 3,000 to 4,000 g / mol.

  Polyethylene particles are preferably used in dispersion.

  aqueous composition, the particles generally having a diameter of 0.1 to 10 μm, preferably 0.1 to 10 μm, in particular 0.1

and 0.6 pm.

  The concentration of the aqueous dispersion of polyethylene wax is in general from 10 to 50% by weight, preferably from

  40% by weight, in particular 30 to 40% by weight.

  The concentration of the polyethylene wax with respect to the cellulose is preferably from 2 to 30% by weight, in particular

from 10 to 20% by weight.

  In a particularly preferred embodiment,

  the dispersion of polyethylene wax also contains an emulsion

  Particularly preferred emulsifiers are xanthan and / or ester waxes In particular, ester waxes are understood to mean compounds of this type which consist of esters of fatty acids and fatty alcohols having a chain length of between C 24

  and C 32 and are essentially straight chain.

  The amount of the emulsifier is generally from 1 to 30% by weight, preferably from 5 to 20% by weight, in particular from 7 to

  % by weight, reported each time to the dispersion.

  Surprisingly, the dispersion can be incor-

  porous in viscose without other additives such as organic solvents miscible with aqueous systems For the manufacture of tubular packaging envelopes regenerated cellulose, which may be optionally reinforced with fibers and

  optionally varnished externally in a known manner, by extrusion

  Spinning or spinning, the usual known method is used.

  In this case, the pipe possibly reinforced with fibers is coagulated in the last stage of its manufacture, regenerated, washed, plasticized and then dried. The modification according to the invention of the viscose can preferably be carried out before the evacuation. aqueous dispersion of the polyethylene wax, preferably a dispersion of 20-40% by weight, in particular 30-40% by weight, which additionally contains the emulsifier in amounts generally up to% by weight, preferably from 7 to 10% by weight, is introduced

in the viscose with stirring.

  A big advantage over the internal impregnation is the immobilization of the wax in the regenerated cellulose. It does not need any other crosslinking agent which prevents the redissolution in the water or which hangs the impregnating film at the layer. of

  cellulose Another great advantage over other impregnated

  It is easy to peel and consists of the excellent properties of the incorporated wax. The casing thus treated has an adhesive power so strong that it contracts during the ripening of the raw sausage without separating, but the final sausage can

  easily peeled The primer according to the invention prevents the separation of

  oil ration There are no variations in the adhesion to the flesh, which can quite occur with a non-impregnated envelope. The primer is applicable to cellulose casings, with or

  without reinforcing fibers and some coloration or pigmentation

conch.

  Finally, the object of the invention is furthermore the use of the packaging envelopes according to the invention for the packaging of

  food products, especially sausage meat.

  Example 1 A solution of cellulose xanthogenate made by the usual method was added with an aqueous dispersion to

  % of a polyethylene wax, until the mixture

  20% by weight of the wax, relative to the cellulose. The batch was stirred slowly for 2 hours and then placed under vacuum for a further two hours. A total of 100 kg of solution was obtained.

casting.

  The tubular packaging casing was manufactured as follows: a strip of hemp paper was shaped into a pipe in the usual manner and coated on both

  sides, the outer face being coated with a usual solution

  cellulose xanthogenate and the inner side with the pre-made mixing solution. The envelope was

  regenerated, plastified and dried.

  The manufacture of sausage samples with raw sausage meat or boiled sausage meat as packing was done in the usual way.

  been watered according to standards before filling.

  a) Filling with raw sausage meat: the skin had not

  not separated after the ripening period, it presented only

  a slight adhesion to the flesh and

had no oil deposit.

  b) Filling with the boiled sausage meat: the skin was torn off after 1 day and had a medium adhesion to the flesh without residues of flesh No frost deposit was observed. EXAMPLE 2 According to the process of Example 1, a packaging envelope was made with 10% polyethylene wax.

  in The viscose of the inner face.

  The properties of adhesion to the flesh corresponded to

those of Example 1.

Example 3

  500 g of casting solution were made from cellulose xanthogenate and a 40% aqueous dispersion of a polyethylene wax such that the concentration of the wax

  The amount of polyethylene glycol was 20% by weight relative to the cellulose.

  We poured from the solution of the films with layer

  intermediate paper The films have been regenerated, washed,

  tified, welded into sections of sausage skin that have been filled

raw sausage meat.

  After the end of the usual maturation period, the sausages were peeled The skin was not separated, it had poor adhesion to the flesh and there were no

  droplets of oil only in the area of the weld.

  Comparative Example 500 g of casting solution were prepared at the same concentrations as in Example 3. However, a 30% wax solution was used as the polyethylene wax component.

  toluene The solution was introduced into the viscose at a temperature of

at 50 C.

  After regeneration, washing, plastification and welding, the skin was filled with raw sausage meat. The skin was removed from the final sausage, resulting in the following result: the skin had not separated, but had a strong adhesion to the material of the sausage There were oil droplets that

on the solder.

Claims (7)

  Process for the manufacture of a regenerated cellulose-based tubular casing of improved peelability by forming a viscose solution in a tubular casing, action of a precipitating agent and usual subsequent treatment, characterized in that one adds to the viscose solution the dispersion of at least one polyethylene wax, mixed and optionally under vacuum.   Process according to Claim 1, characterized in that the polyethylene wax has a molecular weight of 1000 to 7000 g / mol.   Process according to at least one of the preceding claims   dentes, characterized in that 2 to 30% by weight of   polyethylene wax with respect to cellulose.   Process according to at least one of the preceding claims   dentes, characterized in that the dispersion of polyethylene wax is an aqueous dispersion.   Method according to at least one of the preceding claims   characterized in that the poly-wax particles are   ethylene have a size of 0.1 to 100 μm.   Process according to at least one of the preceding claims   dentes, characterized in that the tubular casing is a sausage skin.   Process according to at least one of the preceding claims   characterized in that the tubular casing is reinforced by fibers.