CN1224579A - Biaxially stretched seamed food casing - Google Patents
Biaxially stretched seamed food casing Download PDFInfo
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- CN1224579A CN1224579A CN 98126188 CN98126188A CN1224579A CN 1224579 A CN1224579 A CN 1224579A CN 98126188 CN98126188 CN 98126188 CN 98126188 A CN98126188 A CN 98126188A CN 1224579 A CN1224579 A CN 1224579A
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- film
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Abstract
A tubular food casing comprising a biaxially stretched elongated strip of plastic film having longitudinal edges, said film being curved about a longitudinal axis so that said edges are proximate each other to form a tube, said longitudinal edges being sealed together. Due to its unique properties, the plastic material is preferably a cellulose film from derivatized or non-derivatized cellulose; although, other plastic materials such as polyolefins, halogenated polyolefins and polyamides, such as nylon, can be used. The film is biaxially stretched by at least 10% in a longitudinal direction and at least 10% in a transverse direction, prior to forming the seam, in order to obtain the desired stretch, shrink and strength characteristics. The invention further includes a method for making the tubular food casing.
Description
The present invention relates to be generally used for packing the tubular food casings of the food as sausage.
The tubular food casings of sealing is known by people.For example, United States Patent (USP) 4,396,039; 4,401,136; And 4,563,231 tubular casing that has disclosed this sealing.These tubular casing fibre strengthenings.Therefore this casing has low-down radial contraction characteristic, when former because of drying or other thereby when the encapsulant volume is reduced, can cause its appearance wrinkling.United States Patent (USP) 4,556,708 have disclosed a kind of nonreinforcement formula sausage casing foil, and this casing has very little tearing strength on vertical and horizontal and the shortest orientation.This intensity is lower than the required ideal tensile strength of transverse cross-sectional area, and contraction and tensile properties are lower.United States Patent (USP) 4,940,614 disclosed equally a kind of by adhesive tape, be parallel to the tube of material of longitudinal axis sealing.In addition, the intensity of cellulosic-based material is lower than the required ideal tensile strength of transverse cross-sectional area, and contraction and tensile properties are also undesirable.
Therefore, need be applicable to the sealing tube of material of food casings, when being filled, this casing can be drawn into the tubular casing of the sealing with homogeneous diameter, and when the volume of food of packing reduced, this casing radial contraction was to form the goods of smooth no wrinkle.This casing has good longitudinal stretching stability after being filled, when hanging these goods by an end, it has minimum longitudinal stretching or droop.
Fig. 1 is the perspective view of seamed food casing of the present invention;
Fig. 2 and 3 is depicted as other form of seamed food casing of the present invention.
The present invention relates to a kind of tubular food casings, this casing comprises the biaxial stretch-formed elongated herring bone of plastic material film, described plastic material film has longitudinal edge, described film is around a longitudinal axis bending, so that described edge is right after together each other to form a pipe, described longitudinal edge is sealed together.Though also can use other plastic material, as polyolefin, halogenated polyolefin and polyamide, as nylon, because its particular performances, described plastic material is preferably by the cellophane of deriving or non-cellulose of deriving constitutes.
Usually, in order to obtain desirable stretching, shrink and strength characteristics, before forming sealing, film vertically with 10%-1500%, laterally with 10%-2000% by biaxial stretching.Before forming sealed tube, film is preferably vertically with 20-50%, laterally with 20-50% by biaxial stretching.The tubular-film of making is vertically with 10%-2000%, laterally or radially with 10%-2000% by biaxial stretching.
When plastic material is cellulosics, it can be formed by the regeneration of yellow acid viscose glue, the derivative fibre that also can be other is plain as alkylene oxide, aminomethanate, acetate, alkyl, alkoxyl, the cellulose that propylidene imines or propylene oxide are derived maybe can be to be made by the non-derivative fibre element that amine oxide solution is separated out.
Food casings can directly be sealed to form by adhesive or heat-sealing along the longitudinal edge of film, or is sealed to form with adhesive tape or heat-sealing band.
After shaping, make the food casings shirring, i.e. fold radially, it being compressed along its longitudinal axis, or with its reel store stand-by.
The invention still further relates to a kind of method of making the tubular food casings of sealing, it comprises:
Make tubular-film by the cellulosics solution of extruding in the solvent;
From solution, separate out cellulose;
The tubular-film of biaxial stretching gained;
Vertically tear described tubular-film to form the elongated biaxial stretching cellulosic strip that at least one has longitudinal edge; And
Seal described longitudinal edge to form the tubular food casings of a sealing.
The invention still further relates to a kind of method of making extruded product, it may further comprise the steps: extrude cellulosics solution in the solvent by the annular extrusion mould, this extrusion die has the diameter that is at least 150mm and has the looping pit that a width is 50-2000 μ m, thereby can squeeze out seamless pipe; From the pipe of extruding, separate out cellulose; And longitudinal stretching is also inflated the pipe inside of extruding, so that at vertical and horizontal, with the described pipe of at least 10% biaxial stretching.
In this case, extruded product is seamless, but because diameter is excessive, also is not food casings.Do not have fibre strengthening and be the food casings of extruding tubular form membrane and typically have a diameter from 30mm-150mm.
Extruded product can have vertical slit and be opened to form long and narrow planar film, and this planar film width is at least 500mm, but should also can be 12000mm according to the degree of biaxial tension planar film.The one side of planar film or two faces can have face coat.
This planar film can vertically repeatedly parallelly be torn, and usually at least four times to form at least five planar films with narrow width.Film with narrow width can vertically be sealed pricks and is sealed to sealed tube.The sealing pipe has the size that is suitable for as food casings, and for example diameter is less than or equal to 40mm.On the other hand, the film with narrow width can be formed the pipe that has food filling simultaneously.
Because biaxial stretching, the thickness of extruded product is generally 5-100 μ m.
Utilize one deck fibrous material layer, can carry out coating the face that width is at least the planar film of 500mm.Subsequently, this coated film is vertically torn to form two planar films with narrow width at least, and each planar film is all pricked and sealing by envelope.This coating sealed tube has the diameter that is less than or equal to 200mm and forms the food casings that is coated with fiber.
Pipe-shaped membrane of the present invention can be made by any plastic membrane material in fact, and this material can be oriented to increase strength characteristics and to introduce elastic memory, so that obtain radial and axial shrinkage character.Ideal material among the present invention is for by separating out and the plain film of the derivative fibre of regenerating or by separating out the cellulose membrane material that cellulose membrane obtains in the cellulose solution from the solvent as amine oxide.Being used for cellulosic desirable amine oxide is N-methylmorpholine-N-oxide (NMMO).Be applicable to that derivative fibre cellulosic material of the present invention comprises CS
2To form cellose xanthate, cellose xanthate can be dissolved in the NaOH to form the yellow acid viscose glue.The yellow acid viscose glue can be pressed into pipe-shaped membrane, by utilizing the method regenerated cellulose pipe that the experienced technical staff in the art knows or being pressed into propylene oxide derivative fibre element with selected replacement percentage, so that obtain desirable dissolubility, antimicrobial and flexible nature.
Be used for the film thickness that film of the present invention has about 5-100 μ m (micron) usually.
Before forming the tubular food casings of sealing, film of the present invention is by biaxial tension.In most preferred embodiment of the present invention, at vertical and horizontal (radially) all with 10% biaxially drawn films.Radially and longitudinally draw ratio can be about 1-10.Preferably vertically with about 20%-1500%, horizontal about 20%-2000% oriented film, and preferably vertically with about 20%-600%, laterally about 20%-600% oriented film.The described stretching that is stretching on the vertical and horizontal can be 20%-50%.
In an optimum implementation, to derive or the seamless pipe-shaped membrane of the plain formation of non-derivative fibre by extruding, described cellulose is inflated to obtain radial drawing and to be stretched to obtain longitudinal stretching in the longitudinal axis direction.For example, the extrusion die diameter is the about 300mm of about 10-.In an optimum implementation, pipe-shaped membrane by with move greater than extruded velocity form film roller by longitudinal stretching and by air expansion and by radial drawing.Can calculate and stretch according to being squeezed to dry casing, described stretching be included in cellulose regenerated or separate out before or after stretching.With regard to cellulose, approximately radially be 1 from regenerating or separating out the stretching that obtains: 1.5-1: 4, vertically be approximately 1: 1-1: 4.In regeneration or except that after desolvating, dry described pipe.Subsequently, the described pipe of reeling is used for tearing to form one or more cellulose membrane slender tapes of back, and described cellulose membrane is stretched at vertical and horizontal (radially).Alternatively, after drying, can tear described pipe immediately and subsequently it is wound on the cylinder.To have a plurality of seamless food casings more much smaller in order making, seamless pipe-shaped membrane can be torn into many vertically bands than original seamless pipe-shaped membrane diameter.As shown in the figure, each band of film all has parallel longitudinal direction edge 12, and these edges are crooked each other around longitudinal axis 14, so that these edges are right after together to form a pipe 10.Described edge 12 can be in abutting connection with (Fig. 1) or overlapping (Fig. 2) or face-to-face (Fig. 3).Subsequently, directly or by band 16 longitudinal edge is sealed.When edge 12 during with aspectant mode (Figure 13) sealed together, the sealing that obtains extends radially out from the sealed tube that makes usually.Described sealing can be by any suitable device or method, as heat-sealing or by adhesive, such as acrylic ester adhesive such as methyl methacrylate or cyanoacrylate formation.When being sealed into heat-sealing, basal film is a cellulose membrane, uses heat-sealable polymeric material, as polyvinylidene chloride film or band is carried out coating.
In order to be directly used in the filling operation of food later on, the tubular casing of the sealing that makes can be wound on the cylinder, in this operation, the length of food casings is by radially fold and vertical compression are placed on the top that food is filled conical vessel (a food stuffing hom) to form fold rod (shirred stick).The unique features of food casings of the present invention is that it can form immediately before filling, thereby can realize the continuous food filling operation that utilizes roller shelves or fold rod (shirred stick) not to finish.
Should understand, before or after sealed tube is shaped, can carry out conventional processing casing of the present invention.These processing comprise using peels off auxiliary agent, antitack agent, and plasticizer, printing, colouring agent, as allow painted of food or smoke, hot sealing layer, flavor enhancement, as smoke, and anti-vapour damp-proof layer.
Found that tubular food casings of the present invention compares with the seamless casing with same diameter and film thickness, had identical or the better intensity characteristic.In addition, when by biaxial stretching suitably, even utilize wet type food to fill, sealing casing of the present invention also has good dimensional stability and radially reaches axial stability.When food drying, the casing of the present invention that contains food will radial contraction, even and when hanging the filled articles that makes by casing one end, also can keep constant longitudinal size.
Claims (35)
1, a kind of tubular food casings, this casing comprises the biaxial stretch-formed elongated herring bone of cellulose membrane, and described cellulose membrane has longitudinal edge, and described film is around a longitudinal axis bending, so that described edge is right after together each other to form a pipe, described longitudinal edge is sealed together.
2, tubular food casings according to claim 1 is characterized in that: described film vertically with at least 10% and laterally at least with 10% by biaxial stretching.
3, tubular food casings according to claim 1 is characterized in that: described pipe-shaped membrane is vertically with 20%-1500%, laterally with 20%-2000% by biaxial stretching.
4, tubular food casings according to claim 1 is characterized in that: described cellulose is non-derivative fibre element.
5, tubular food casings according to claim 1 is characterized in that: described cellulose is regenerated from the yellow acid viscose glue and is formed.
6, tubular food casings according to claim 1 is characterized in that: described cellulose is the derivative fibre element.
7, tubular food casings according to claim 5, it is characterized in that: described film has the thickness of 5-100 μ m.
8, tubular food casings according to claim 1 is characterized in that: described food casings forms with the shape of fold rod.
9, tubular food casings according to claim 1 is characterized in that: by adhesive described edge is sealed each other.
10, tubular food casings according to claim 9 is characterized in that: described adhesive is a cyanoacrylate adhesive.
11, tubular food casings according to claim 1 is characterized in that: described edge is sealed each other by band.
12, tubular food casings according to claim 11 is characterized in that: described band is a heat seal type band.
13, tubular food casings according to claim 11 is characterized in that: described band is an adhesive tape.
14, a kind of method of making the tubular food casings of sealing, this method comprises:
Make tubular-film by extruding the solution of cellulosics in solvent;
From solution, separate out cellulose;
With vertically at least 10% and the horizontal tubular-film of at least 10% biaxial stretching gained;
Vertically tear described tubular-film to form the elongated biaxial stretching cellulosic strip that at least one has longitudinal edge; And
Seal described longitudinal edge to form the tubular food casings of a sealing.
15, method according to claim 14 is characterized in that: described solution is the non-derivative fibre cellulose solution in comprising the solvent of amine oxide.
16, method according to claim 15 is characterized in that: described amine oxide is the solvent that comprises NMMO.
17, method according to claim 14 is characterized in that: described solution is the derivative fibre cellulose solution in comprising the solvent of amine oxide.
18, method according to claim 14 is characterized in that: described solution is the cellose xanthate solution that has in the solvent of NaOH, and described cellulose is separated out by regenerated cellulose.
19, method according to claim 14 is characterized in that: described film is laterally with 20%-1500%, vertically with 20%-2000% by biaxial stretching.
20, method according to claim 14 is characterized in that: produce a plurality of vertical slits to form many long and narrow biaxial stretching bands.
21, method according to claim 14 is characterized in that: by the described longitudinal edge of adhesive seal.
22, method according to claim 14 is characterized in that: by the described longitudinal edge of band sealing.
23, method according to claim 22 is characterized in that: described band is an adhesive tape.
24, method according to claim 22 is characterized in that: described band is a heat seal type band.
25, method according to claim 14 is characterized in that: the described pipe-shaped membrane of cross directional stretch by making the pipe-shaped membrane expansion.
26, method according to claim 14 is characterized in that: by to move the roller longitudinal stretching pipe-shaped membrane of film greater than extruded velocity.
27, a kind of method of making extruded product, it may further comprise the steps:
Extrude cellulosics solution in the solvent by the annular extrusion mould, this extrusion die has the diameter that is at least 150mm and has the looping pit that a width is 50-2000 μ m, thereby squeezes out seamless pipe;
From the pipe that is squeezed into, separate out cellulose; And
Longitudinal stretching is also inflated the pipe inside that is squeezed into, so as at vertical and horizontal with the described pipe of at least 10% biaxial stretching.
28, method according to claim 27, the step that this method also comprises has: vertically tear and open the biaxial stretching film, to form the elongated plane film that width is at least 500mm.
29, method according to claim 28, the step that this method also comprises has: be coated with application layer at least on a face of planar film.
30, method according to claim 29 is characterized in that: coating first coating on a face of planar film, coating second different coating on the planar film another side.
31, according to arbitrary described method among the claim 28-30, the step that this method comprises has: at least four times parallel longitudinal is torn long and narrow planar film so that form at least five planar films with narrow width.
32, method according to claim 31 is characterized in that: each planar film with narrow width is all vertically sealed bundle and is sealed to a sealed tube, and the sealing pipe has the diameter that is less than or equal to 40mm, thereby forms food casings.
33, method according to claim 32 is characterized in that: the ripple type that is sealed into of sealed tube seals.
34, according to arbitrary described method among the claim 29-30, it is characterized in that: a coating is one deck fibrous material, and this cellulosic material is laminated on the planar film surface.
35, according to the method in the claim 34, this method comprises: the step of vertically tearing long and narrow planar film, so that form at least two planar films with narrow width, each planar film is all vertically sealed pricks and is sealed to sealed tube, the sealing pipe has the diameter that is less than or equal to 200mm, thereby forms a food casings that is coated with fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98126188 CN1224579A (en) | 1997-12-12 | 1998-12-11 | Biaxially stretched seamed food casing |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US990,124 | 1997-12-12 | ||
| CN 98126188 CN1224579A (en) | 1997-12-12 | 1998-12-11 | Biaxially stretched seamed food casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1224579A true CN1224579A (en) | 1999-08-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98126188 Pending CN1224579A (en) | 1997-12-12 | 1998-12-11 | Biaxially stretched seamed food casing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1224579A (en) |
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1998
- 1998-12-11 CN CN 98126188 patent/CN1224579A/en active Pending
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