CN101041390B - Highly compressed filter tow bales and process for their production - Google Patents

Highly compressed filter tow bales and process for their production Download PDF

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Publication number
CN101041390B
CN101041390B CN2007100057300A CN200710005730A CN101041390B CN 101041390 B CN101041390 B CN 101041390B CN 2007100057300 A CN2007100057300 A CN 2007100057300A CN 200710005730 A CN200710005730 A CN 200710005730A CN 101041390 B CN101041390 B CN 101041390B
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China
Prior art keywords
bale
bale packing
packing
film
filter tow
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CN101041390A (en
Inventor
迪特马尔·克恩
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Cerdia Produktions GmbH
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Rhodia Acetow GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/02—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
    • B65B63/028—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles by pneumatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/02—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/07—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles

Abstract

Disclosed is a packed, highly compressed cuboid-shaped filter tow bale, the top side and bottom side of which are free from nuisome curvatures or constrictions. Said bale is characterized by the factthat a) the bale has a packing density of at least 300 kg/m<3>, b) the bale is entirely wrapped in a mechanically self-supporting, elastic packing material which is provided with one or several convectively airtight connections, and c) the top side and bottom side of the bale are so flat that a flat plate which fully covers the bale can be pressed onto the top side of the bale via a centrally effective normal force of 100 N and at least 90 percent of the surface of the top side of the bale, which lies within the largest rectangle that can be inserted by vertically projecting the bale onto thepressed plate, has a maximum distance of about 40 mm from the flat plate when the unopened bale is placed on a horizontal plane. A particularly suitable method for producing said bale comprises the following steps: a) filter tow is supplied in a compressed form; b) the compressed filter tow is enveloped in a wrapping; c) the wrapping is closed in an airtight manner; and d) the wrapped bale is relieved of the load. The wrapping of such a bale is largely prevented from bursting as a result of the prevailing internal pressure. The inventive bale has an ideal cuboid shape such that curvatures negatively affecting the bale during transport or constrictions hampering the behavior of the filter tow are largely prevented from occurring.

Description

The filter tow bale packing and the manufacture method thereof of high compression
The application is that application number is dividing an application of 03809146.1 application for a patent for invention.The international filing date of original application is on April 22nd, 2003, and denomination of invention is " the filter tow bale packing and the manufacture method thereof of high compression ".
Technical field
The present invention relates to a kind of cube filter tow bale packing packaged, high compression, on the end face of this bale packing and bottom surface, do not have protuberance or the contraction disturbed, the invention still further relates to a kind of its manufacture method.
Background technology
When manufacturing is used for the filter tow of cigarette industry manufacturing filtering rod, tow is placed so-called " fill and add groove ".At this, filter tow lays the unit by one and is distributed in lamination on the cross-sectional plane of filling groove equably at the crank motion on the vertical and horizontal.Many like this laminations are laid up and down, be packaged in weight and the height that has reached desired in the filling groove up to filter tow.Be the hundreds of kilogram generally at this regional package weight.In WO 02/32238, describe a kind of bale packing of high compression and one and be used for the processing problems of filling the method for a filling groove best and avoiding causing thus.
The material that then will be filled in the groove pushes on stacked up and down layer direction.Be packaged in extrusion equipment inside and open fully from top will also being in filter tow under the compression effort after the extruding, so packing make the filter tow packing form so-called bale packing by the packing parcel and with extrusion equipment.Common packing are cardboards, and they mechanically are fixed together by belt passing round and lining cement, or plastic fabric, and they for example connect sealing by a hasp.An example that is used for bonding packing has been described in German utility model 7635849.1.Sample (RHODIA Acetow Co., Ltd in company, Engesserstrasse 8, D-79108 Freiburg) finds the information that has the filter tow packing of plastic fabric about one in " Some Usefull Information about the reusable Packaging for RhodiaFilter Tow ".The two kinds of packaged forms in back all do not have additional belt passing round.
Packing for the not band strip winding of described form, when finishing, crumpling process produces the compression effort of packing owing to the elastic restoring force of the filter tow that compresses in bale packing unloading back, especially at extrusion equipment, it causes the increase of packaging volume and the expansion of not expected on bale packing end face and bottom surface.This expansion does not influence the use according to the rules of filter tow for carrying out when the measure described in the WO 02/32238A2, but hinders heap pile filter tow packing reliably.This problem is according to prior art or by side direction heap pile bale packing or use extraordinary plate to be solved, as its described in the above-mentioned Rhodia-document.In addition because too high interior pressure often produces and packs the relevant problem of cracking.
US-A-4,577,752 have described the solution of a belt passing round problem.Change scheme for the packing of belt passing round, the influence of expansion when using according to the rules than described in the WO 02/32238A2 still less, disperseing tensile strength appears in the result of contraction.But the bale packing of this belt passing round also may ftracture.Generally also between the packing of filter tow and above-mentioned machinery carrying, use a liner for the filter tow packing.This liner prevents that filter tow from being polluted, and especially is subjected to the pollution of stink, and prevents that water vapor diffusion from advancing packing or diffuse out from packing.This liner is made up of three parts usually, and their looselys are added in the external packing.
Summary of the invention
The objective of the invention is, provide a kind of desirable cube filter tow bale packing of high compression, on bale packing end face and bottom surface, do not disturb the protuberance of bale packing transportation and prevent the contraction of filter tow output, wherein avoid the compression effort of packaged filter tow and especially can avoid as much as possible being packaged in depress cracking.In addition, the objective of the invention is to give corresponding packing method.
This purpose is achieved by filter tow cube bale packing of the present invention and the method that is used to make this bale packing of the present invention.
Therefore of the present invention to as if the cube bale packing that constitutes by filter tow of a packaged high compression, on the end face of this bale packing and bottom surface, not have the protuberance or the contraction of interference, it is characterized in that:
A. described bale packing has a 300kg/m at least 3Packed bulk density,
B. described bale packing carries certainly by a machinery, elastomeric packing wrap up fully, and wherein this material has being tightly connected of one or more convection current,
C. the end face of described bale packing and bottom surface are smooth in this wise, make when the bale packing that will not open is arranged on the horizontal plane, and a flat board that hides bale packing fully can be expressed on the end face of bale packing by a 100N normal force in the centre effect; And rectangle inside in maximum, be positioned at top bale packing face area at least 90% have the distance of the most about 40mm from flat board, described maximum rectangle can in be connected in the vertical projection on the plate that is extruded of bale packing, described bale packing face is positioned at the rectangle inside that connects
D. described bale packing has a disruption characteristic that is at least 10N/15mm of measuring according to DIN EN ISO 527-3 as packaging film, and
E. in bale packing, after packing, there is a negative pressure that is at least 0.01bar with respect to ambient pressure at least.
By the method that is used to pack the filter tow bale packing of the present invention, have following process steps:
A. the filter tow for preparing compressed format,
B. seal the filter tow of compression with a packaging film,
C. enclose film airtightly,
D. make the bale packing of sealing lax, and
E. in negative pressure that is at least 0.01bar with respect to ambient pressure of the inner generation of lax packaging film.
The defective of at present common transport package was estimated in the description of prior art.At this at first is the double-deck transportation of protuberance influence on bale packing bottom surface and the end face.This problem is solved by bale packing is transported not with above-mentioned control position but with the side deposit position.Need two additional working processs for this reason, promptly before transportation, make the bale packing half-twist and after transportation, make bale packing be turned back to control position.There is interference equally in the contraction that produces by belt passing round.This makes the filtering rod that is made of filter tow produce bigger tensile strength dispersion when using bale packing according to the rules.This accounts for more than 5% of being made by bale packing of filtering rod.The packed bulk density of bale packing is high more, and the difficulty that overcome these two problems is just big more.These problems from packed bulk density greater than 300kg/m 3Begin to occur.
Confirm in surprise according to a series of experiments that have no effect,, then can prepare one not with influencing protuberance that transports and the cube bale packing that disturbs the contraction of using according to the rules if be packaged in sealing airtightly in the packaging process.Therefore consider to set out by reality, above-mentioned bale packing by a machinery from carrying, elastomeric packing wrap up fully, wherein this material has being tightly connected of one or more convection current.
May think for the analysis people on the first surface, relate to a vacuum-packed bale packing according to bale packing of the present invention, promptly one with know well most by each user used in everyday vacuum-packed like that.But be not this situation.For the purpose that is proposed according to cube bale packing of the present invention is to set up a definite shape.The purpose of described hermetically sealed packaging in manufacturing process is to bear also equilibrium of pressure gradient in the end face and the bottom surface of bale packing.May abandon requirement, as to packaging intensity, permeability to air and moisture peretrability etc. to packing.Just the opposite, if the also perforation in large area after packaging process of original air tight material also keeps its characteristic according to bale packing of the present invention.Abandon this additional measure for the consideration of reality.
According to the geometric configuration of bale packing of the present invention by above-mentioned feature c) describe.The distance of each point of the bale packing side on this is positioned at can be determined thus, that is, use a transparent plate to determine by reflection measurement with the distance of plate as plate and each point.Also can select to use the continuation method of other measuring distance.Preferred especially in scope according to the present invention instruction, be positioned at that 90% table of top bale packing face is long-pending to have a 25mm the most about, the distance of the most about 10mm especially with respect to flat board, this surface be positioned at work connect rectangle inside.
Packaging volume about bale packing is verified, and described bale packing has one greater than 0.9m 3Packaging volume and/or packed bulk density greater than 350kg/m 3And especially less than 800kg/m 3Be favourable.Relevant with the loading in being packaged in freight container, verified its height of least of bale packing for a cube shaped be about 900, especially minimum for about 970mm be particularly suitable.In this case, described bale packing can stack by bilayer in freight container.Particularly advantageous is that the cube height of packing is 970 to 1200mm, and wherein such cube can individually stack in freight container.Also can make obviously higher bale packing, therefore make Packing Fee with respect to fibre weight minimum to be packaged.This large scale packing has advantage under the filter tow Packing Condition, only needs seldom to change bale packing when using filter tow processing cigarette filter in a filtering rod machine inferiorly.
For packaging film plastic sheeting preferably.At this, being tightly connected of convection current is made of a sir-tight seam of convection current, and it is particularly advantageous being made of the sealing seam of an overlap joint or fin-shaped seam (Flossennaht).
Described film is made or is made by a laminated film that comprises an aramid layer and a polyethylene layer by polyethylene, especially LDPE or by modified polyethylene (LLDPE).For advertisement and/or purpose attractive in appearance can use a film dyeing or printing as packing film.When filter tow to be packaged during to photaesthesia, this point is effective especially.This outer film can be furnished with adhesive labels, and they have the information about packing content.Other method by packing transmission information is to extrude an embossment, and it sees through because the film that negative pressure tightly leans can be seen.Except product mark, embossment also can for example comprise a company and/or user label.Described film preferably has proof, and they are characteristics of failure-free transport package.Therefore using a thickness is the film of 100 to 400 μ m.If wish, can when final enclose film or film end, promptly after machining the cube bale packing, form a transport package of making by cardboard, plastic fabric etc. around film.This transport package can additionally twine with belt.Improve the mechanical stability of packing thus, therefore can select thin and therefore cheap film.But emphasize that it is essential that this transport package does not force in scope of the present invention.
The method that is used to pack according to filter tow bale packing of the present invention has following processing step: a) filter tow of preparation compressed format, b) seal the filter tow of compression with a packaging film, c) enclose film airtightly, d) make the bale packing of sealing lax, and e) in negative pressure that is at least 0.01bar with respect to ambient pressure of the inner generation of lax packaging film.With hermetic closed bale packing when lax, produce a negative pressure in that packaging film is inner, it preferably is at least 0.01bar, and is 0.15 to 0.7bar according to a particularly advantageous process.
Because the hermetic closed of packaging film can be in the negative pressure that is produced by the inner maintenance of packaging film area surrounded.This negative pressure has reduced the pressure applied to the packaging internally owing to the elastic restoring force of elastomeric material.Can avoid expansion as is common in the prior art for this reason.Improve the stacking property of the packing that produces thus.Owing to reduced internally the mechanical pressure of packing also have been reduced the danger that packing lost efficacy or tore by negative pressure.Can improve packed bulk density by this method, this has the compact advantage that also reduces the accumulating volume thus of packing.Especially by this method can utilize the memory capacity of freight container best, in freight container, deposit the filter tow that this packing is crossed.
Usually realize preparing filter tow by known extrusion equipment with compressed format.Can carry out so on the one hand according to method of the present invention, the filter tow amount that regulation is to be packaged is at first mechanically compressed in extrusion equipment and is wrapped up with packaging film then.In this case, realize the extrusion equipment inside that is enclosed in of packaging film.This embodiment has entire method a local advantage that realizes.
Also can carry out the compression of filter tow in advance on the other hand at an independent station.In this case, the filter tow that precompressed compression is good is transported in one of multiple package position " auxiliary package " that for example is made of geometrical clamp, the filter tow of removing auxiliary package there and will having compressed wraps up by packaging film, and produces negative pressure and packaging film is sealed airtightly.It is not the advantage of all carrying out on the extrusion equipment position that this embodiment has entire method, therefore has higher availability.In addition, the extrusion cycle time is short and have bigger degree of freedom for the use of packaging film, because the bale packing of compression can be approaching from all sides at multiple package position.
With different, when using, can abandon being used to preventing polluting the liner with water vapour, because this purpose is achieved by the packaging film that is used to pack according to method of the present invention according to prior art.
For according to method of the present invention, can obtain at first essential negative pressure by different modes.According to a special simple embodiment, by the filter tow material expansion generation negative pressure of compression.Then it is sealed airtightly by packaging film parcel back in packed state at filter tow, to the external pressure reduction of packing, therefore this material expands at package interior under the effect of elastic restoring force.Because packaging volume is increased in the intra-zone of packaged membrane closure and sets up a negative pressure.Preferably select packing measurement like this, make compressible filter tow incomplete expansion, that is, filter tow yet is positioned at package interior with compressive state in packaging film inside later in its demi-inflation.This embodiment has in order to produce the advantage that negative pressure need not additional mechanism providing additional operation.Therefore it provides an economic especially method.
According to another embodiment, it can have selection or additionally be used for such scheme, by the air generation negative pressure of the packaged membrane-enclosed intra-zone of sucking-off.Can realize higher vacuum than " self vacuum " recited above by this method.Can adjust desired negative pressure with higher precision by this method in addition.
Described suction for example realizes by means of one or more vacuum pumps.They are at first connected at sucking-off side and originally hermetic closed package interior, then enter operation.After reaching desired negative pressure, again pump and packing are separated, and then the suction connection location of packaging film is sealed airtightly.
The combination of above-mentioned two kinds of embodiment has advantage, can keep the time of the acquisition vacuum of weak point, because obtain negative pressure by two different measures, two kinds of measures can be carried out simultaneously.Make required squeese pressure littler in addition, because can select a bigger packing measurement, wherein " packing measurement " can be understood as: when hermetic closed at the height of the extrusion equipment filter tow bale packing that is used for compressing.The last height that can regulate the bale packing filter tow in this way with good precision.Can compensate externalities thus, for the influence of filter tow especially season, fiber number, weight.
For preferably produce an about negative pressure of 0.15 to 0.7bar below ambient pressure according to method of the present invention.This point corresponding to one by about 0.85 to 0.3bar the absolute pressure of the intra-zone of film wrapped.Therefore the negative pressure that relates to a low vacuum scope, this is for normally fully enough according to method of the present invention.A verified about negative pressure of 0.2 to 0.4bar, be particularly suitable corresponding to an about absolute pressure of 0.8 to 0.6bar.Selection for the concrete scope of negative pressure is depended on different parameters, the form of material especially to be packaged and amount, desired packed bulk density, employed packaging film etc.Can think that on principle vacuum or negative pressure are high more, just can realize compact more packing.Expand and also can acutely reduce along with the increase of negative pressure.But must consider at this, be used to realize that the time hypergeometric of negative pressure increases routinely, desired vacuum is just meticulous more.
For selecting employed packaging film like this according to the inventive method, the feasible desired time stability of the negative pressure that produces and the desired package packing machine stability of guaranteeing.According to employed packing material and form, desired time stability generally changes between several days and several months or several years.Therefore can use film with different gas permeability.
According to an embodiment, preferably use by polyethylene or modified polyethylene the film of making as LDPE or LLDPE as packaging film.About LDPE can be the low density polyethylene (LDPE) of under high pressure making, and wherein identifying LLDPE is the poly abbreviated form with lower density and linear structure.This film has advantage, and it relates to a kind of simple (sortenrein) film, and it can obtain with very low cost.But polyethylene foil has relatively low intensity, so it is particularly useful for low packed bulk density and less amount to be packaged.Because the higher relatively permeability to air of polyethylene standard film, so it more is applicable to the field of application in the storage time that is no more than several weeks.
Also can select to use a kind of polyamide and poly laminated film as packaging film.This laminated film is because low especially permeability to air and high strength and unusual, makes negative pressure remain unchanged substantially at interval for a long time at one.Preferably about 1/3 polyamide component and about 2/3 polyethylene component.
Preferred packaging film or film for the permeability to air of air less than being 10000cm 3/ (m 2* d*bar), especially less than 200cm 3/ (m 2* d*bar) and especially preferably less than 20cm 3/ (m 2* d*bar).These numerical value are measured under 23 ℃ and 75% relative humidity condition according to DIN 53380-V.Guarantee thus, enough keep vacuum for a long time and make packing loose and keep compact as much as possible.In addition, described zone covers by film common on the market (for example PA-PE-laminated film).Be stressed that, do not produce the air conduction of convection current by film, but only produce the material conduction by film diffusion.Given permeability to air numerical value relates to a component (about 78%N who is similar to ambient air 2, 21%O 2, 1% other gas).At this permeability to air only with respect to oxygen and nitrogen.Except film, in scope of the present invention, also can use other can satisfy the gas permeable material of above-mentioned condition.
The water vapour percent of pass of described film or other encapsulating material is measured according to DIN 53122 second portions, is preferably in 5g/ (m under 23 ℃ and 85% relative humidity 2* d), especially at 2g/ (m 2* d).The water vapour percent of pass is not important for the shaping function of packing.But a not only airtight but also packing waterproof steam is advantageous, can keep the product humidity of filter tow by this packing.This point is significant for filter tow.Therefore by bale packing equilibrium humidity and the exchange that do not produce water vapour and environment.The thick polyethylene foil of 100 μ m has an about 1g/ (m 2* water vapour permeability d).
About mechanical strength, described packaging film or film are measured according to DIN EN ISO 527-3 have a breaking strength at least about 10N/15mm, is preferably greater than 100N/15mm and is preferably greater than 200N/15mm especially.Above-mentioned numerical value relates separately to the minimum of the breaking strength of film on vertical and horizontal.About the concrete selection of breaking strength, whether be used for carrying still packing according to the bale packing of blister-pack.As the material that may use can be thickness when being 100 μ m breaking strength be 15 to 30N/15mm PE and thickness when being 100 μ m breaking strength be 150 to 300N/15mm PA6.
Verified, plastic sheeting for example has by the vapour barrier that polyamide, polyester or ethylene-vinyl alcohol-worker's poly-mer (EVOH) is made, and perhaps has for example by SiO x, the oxidized metal coating made such as aluminum oxide, and the aluminium film is particularly advantageous.Be not limited to the above-mentioned film kind of enumerating.Because the air impermeability of film guarantees also that every fragrance prevent that promptly outside fragrance from entering, this may be favourable for different packing materials.Certain toughness of film itself is important for the mechanical stability of film.This point especially realizes well by polyamide.
A kind of method that is used for enclose film airtightly or film is, with its welding or sealing.Therefore selected film preferably can weld or be sealable.Relevant therewith low melting point membraneous material is favourable.This list polyolefin, as polyethylene or polypropylene or contain ethene or the poly-mer of propylene such as EVA, LLDPE etc.The material that satisfies weldability or leak tightness is called sealing layer below.A kind of film can only be made by this sealing layer where necessary or also can be made by one or more sealing layers and other compound that for example guarantees the layer of mechanical strength.
In order to guarantee to unpack easily, sealing layer can be " scalable ", promptly is not to seal in heterogeneity.This heterogeneous sealing layer can produce by different modes, for example certain position by polybutene being mixed sealing layer or with respect to LLDPE sealing polypropylene.The other method that ancillary method is opened wide in preparation is to set a tear-strap on packing film.This method is particularly useful for having the film of low toughness.Can be furnished with the turning or the analog of protrusion at last, they are cut when unpacking.Air can enter package interior after cutting off the turning of protrusion, therefore makes packing loose.Then packing can be opened wide without a doubt by a film scissors, and can not damage packing material.
Also can select to come enclose film or film by bonding.This embodiment has the advantage that can abandon sealing arrangement.Can certainly use other packing film that is fit to sealing mode,, but also satisfy simultaneously for the required mechanical tensile strength in each use field as long as they can satisfy desired sealing characteristics.
Sealing or welding for example can realize under the condition that forms lapped seam.A lapped seam can be born relatively large pulling force, and if when packing blowing-by and whole thus elastic restoring forces act on packing internally, the material of packing is aggregated to together under the state of just having packed especially reliably.Therefore this closing form is special failure-free, and wherein film will have a sealing seam (perhaps essential is become by this sealed sewing) in this case aptly on the two sides.
According to another embodiment, described welding or be sealed under the condition that forms a fin-shaped seam and realize that this professional for the processing film field knows.This point has the advantage that is easy to from external process, but its ability of bearing pulling force is lower than lapped seam.
Described packaging film or film for example can constitute with the form of a whole bag.The parcel of the filter tow that has prepared in this case, and the packaging group of candy are seemingly.Also can select this to make film by a bottom surface, end face and one around seal ring form.The length overall that connects seam in this case increases, because various piece must be stitched together.According to another preferred embodiment, described blister-pack can be made up of an end face and an end face, it for example by deep-draw with become the bag or the similar approach preform.Also there is this possibility at last, film is constituted with the same parts by two mutual interlockings of tennis.In scope of the present invention, also it is contemplated that the form of the formation blister-pack that other is fit in addition.
If desired, follow final enclose film or film, promptly add later on a external packing of making by cardboard or plastic fabric etc. finishing blister-pack around film.Can improve the mechanical strength of packing thus, therefore can select thin and therefore economic film.But be stressed that this external packing is optional in scope of the present invention.
What form when using an aforesaid external packing (Umverpackung) may be, blister-pack is constituted with lower leak tightness consciously, make negative pressure in one to two day with the ambient pressure balance.In other words, this packing during this period of time loses its vacuum.Make packaged filter tow in external packing, expand, but compare that it has less expansion to the end face and the bottom surface of packing with packaged filter tow method according to prior art.
The film that uses in according to the inventive method preferably has the thickness of about 100 to 400 μ m, and wherein the thickness range of 200 to 300 μ m and especially 250 to 300 μ m is verified is particularly suitable.The kind that the accurate thickness of the film that uses will be packed bulk density and employed membraneous material according to size and weight, the bulk compressibility of lamination coating to be packaged is selected.As mentioned above, if use an external packing additional, that for example make, can select slightly thin film where necessary by cardboard.
Compressible filter tow to be packaged is especially with visual cube preparation.Can realize good especially stacking property of packing and carrying property and convenient the storage thus.The filter tow that exists with the rope form preferably makes tow rope stratification up and down layer by layer, and is just described according to the method for prior art as combination.
Description of drawings
Describe the present invention in conjunction with the accompanying drawings in detail by means of preferred embodiment below.In the accompanying drawing:
Fig. 1 a to 1c illustrates each step according to the embodiment of the inventive method;
Fig. 2 a to 2b illustrates an expansion structure according to the package of the inventive method manufacturing;
Fig. 3 a illustrates a diagram of curves, and the package that its expression is made according to the inventive method is using under the polyethylene foil condition characteristic of process in time;
Fig. 3 b illustrates one and the similar diagram of curves of Fig. 3 a, still is used for the laminated film of being made by polyethylene and polyamide;
Fig. 4 a illustrates different curves, and they are illustrated in the relation of packing measurement and bale packing height under the different negative pressure; And
Fig. 4 b illustrates different curves, and they are illustrated in the relation between the addition of vacuum and bale packing height under higher temperature and the low air pressure.
The specific embodiment
A kind of compressible elastotic material 1 is the bale packing of filter tow in the present embodiment, by a film 2 parcel and place an extrusion equipment 3, as by shown in Fig. 1 a.In the extrusion equipment 3 that 300 to 400t squeese pressures for example are provided, described bale packing is compressed to desired packing measurement.Then with film 2 except one as sealing airtightly in the little zone of the inhaling hose joint location that is used for vacuum pump 4, for example rotary slide valve vacuum pump.Inside by the zone of film 2 parcel is evacuated down to desired negative pressure by vacuum pump 4 then.If reach this point, vacuum pump flexible pipe and film are separated and joint location is sealed airtightly.As mentioned above, if only wish the negative pressure that a less expansion of passing through bale packing can realize, then can abandon using vacuum pump.
This in the next step shown in Fig. 1 b, extrusion equipment 3 is reached unlatching, bale packing is expanded partly again, so will allow blister-pack to become big.The filter tow bale packing of finishing packing can be taken out from extrusion equipment now and place a conveying and storing state, shown in Fig. 1 c.The height of the bale packing of packaging also depends on vacuum intensity.
In Fig. 2 a and 2b,, promptly has the outward appearance of the packaged filter tow bale packing of external packing 5 as can be seen according to another step of the inventive method.This packing is particularly useful for carrying and for example being made by light-duty cardboard.The professional knows this external packing, therefore here repeats no more.
Fig. 3 a and 3b illustrate a diagram of curves respectively, package of making according to the inventive method of their expressions use one by the situation of a polyethylene foil or a laminated film of making by polyethylene and polyamide under the characteristic of process in time.Polyethylene foil shown in Fig. 3 a has an about 600ml/ (m 2* permeability to air d*bar), the 10ml/ (m and the permeability to air of the laminated film among Fig. 3 b is only had an appointment 2* d*bar).See that as two curves relatively remain unchanged substantially above the hundreds of sky time in the negative pressure that is produced under the situation of using laminated film, the bale packing height also is like this.And using under the situation of polyethylene foil negative pressure descending half later on surpassing 100 days, and the bale packing height has increased 10cm in the identical time many.Therefore for up to 2 years or although the longer storage time expense of having a mind to is higher also will use laminated film.
As what can be seen by Fig. 4 a, employed degree of vacuum is high more, and the bale packing height just can remain more little.Three different curves shown in the drawings, the relation of bale packing packing measurement and attainable bale packing height when wherein uppermost curve is represented not use vacuum pump, middle curve table is shown in the relation when using the 0.1bar addition of vacuum, and the relation curve of nethermost curve when representing to use the 0.2bar addition of vacuum.The bale packing weight of 3Y35 type filter tow when the 370t squeese pressure of being processed is 580kg.Guarantee in about 60s, to produce reliably the addition of vacuum of a 0.1bar for this ratio.
In the relation of bale packing height and addition of vacuum intensity during in changes in environmental conditions shown in Fig. 4 b, wherein air themperature for about 40 ℃ of environmental air pressures than the high about 0.05bar of Fig. 4 a example illustrated.As can be seen, the bale packing height increases when low air pressure and temperature increase.
Use the thick laminated film of making by polyethylene and polyamide of about 200 μ m for the foregoing description.By means of the water-tight equipment sealing, one of them seal ring is connected with bottom part with preformed end face in compression machine respectively this film by manual.Squeese pressure is 370t always.Packing cost is by means of can obviously reducing according to method of the present invention.
According to another experiment, the bale packing of an identical weight highly is filled in the laminated film of being made by polyethylene and polyamide and with its sealing with the packing of 900mm.Opening extrusion equipment highly is 970mm later on.In packing, showed no sign of and the bale packing expansion occurred.The volume that is arranged in the air of bale packing by increase obtains a negative pressure corresponding to the 0.12bar of 0.88bar absolute pressure.Be issued to this negative pressure in the situation that does not have the vacuum pump ancillary method.
In another experiment, the bale packing of an identical weight highly is filled in the laminated film of being made by polyethylene and polyamide and with its sealing with the packing of 900mm, wherein package interior is evacuated to 550bar negative pressure corresponding to the 450bar absolute pressure by means of a vacuum pump.The about 930mm of height of bale packing after opening extrusion equipment.Obtain a pressure at package interior corresponding to the 0.42bar of the negative pressure of 0.58bar.No longer producing bale packing in packing expands.

Claims (32)

1. the cube bale packing that is made of filter tow of a packaged high compression does not have protuberance or the contraction disturbed on the end face of this bale packing and bottom surface, it is characterized in that,
A. described bale packing has a 300kg/m at least 3Packed bulk density,
B. described bale packing carries certainly by a machinery, elastomeric packing wrap up fully, and wherein this material has being tightly connected of one or more convection current,
C. the end face of described bale packing and bottom surface are smooth in this wise, make when the bale packing that will not open is arranged on the horizontal plane, and a flat board that hides bale packing fully can be expressed on the end face of bale packing by a 100N normal force in the centre effect; And rectangle inside in maximum, be positioned at top bale packing face area at least 90% have the distance of the most about 40mm from flat board, described maximum rectangle can in be connected in the vertical projection on the plate that is extruded of bale packing, described bale packing face is positioned at the rectangle inside that connects
D. described bale packing has a disruption characteristic that is at least 10N/15mm of measuring according to DIN EN ISO 527-3 as packaging film, and
E. in bale packing, after packing, there is a negative pressure that is at least 0.01bar with respect to ambient pressure at least.
2. bale packing as claimed in claim 1 is characterized in that described bale packing has the height that is at least 900mm.
3. bale packing as claimed in claim 1 is characterized in that, described bale packing has one greater than 0.9m 3Packaging volume and/or packed bulk density greater than 350kg/m 3
4. bale packing as claimed in claim 3 is characterized in that described packed bulk density is less than 800kg/m 3
5. as claim 2 or 3 described bale packings, it is characterized in that this bale packing has the height of 970mm at least.
6. bale packing as claimed in claim 5 is characterized in that, described bale packing has one 970 to 1200mm height.
7. bale packing as claimed in claim 1 is characterized in that described packing are films.
8. bale packing as claimed in claim 7 is characterized in that packing are plastic sheetings.
9. bale packing as claimed in claim 1 is characterized in that, it is a convection current air tight seam that described convection current air tight connects.
10. bale packing as claimed in claim 9 is characterized in that, the sealing seam that described convection current air tight seam is an overlap joint or a fin-shaped seam.
11. bale packing as claimed in claim 1 is characterized in that, described be positioned at connect the rectangle in-to-in, be positioned at top bale packing face area 90% have the distance of a maximum 25mm from flat board.
12. bale packing as claimed in claim 11 is characterized in that, described be positioned at connect the rectangle in-to-in, be positioned at top bale packing face area 90% have the distance of a maximum 10mm from flat board.
13., it is characterized in that described film is made by polyethylene or by modified polyethylene as claim 7 or 8 described bale packings.
14. bale packing as claimed in claim 13 is characterized in that film is made by LDPE.
15. bale packing as claimed in claim 7 is characterized in that, described packing are the laminated films with an aramid layer and a polyethylene layer.
16., it is characterized in that described packing have the thickness of about 100 to 400 μ m as claim 1,7,8 or 15 described bale packings.
17. bale packing as claimed in claim 1 is characterized in that, this bale packing has an additional transport package of being made by cardboard or plastic fabric, and/or this bale packing is additionally sealed with belt.
18. a method that is used for packing as each described filter tow bale packing of claim 1 to 17 has following process steps:
A. the filter tow for preparing compressed format,
B. seal the filter tow of compression with a packaging film,
C. enclose film airtightly,
D. make the bale packing of sealing lax, and
E. in negative pressure that is at least 0.01bar with respect to ambient pressure of the inner generation of lax packaging film.
19. method as claimed in claim 18 is characterized in that, described negative pressure produces by self the expanding of filter tow of compression.
20. method as claimed in claim 18 is characterized in that, described negative pressure produces by aspirating out air.
21. method as claimed in claim 20 is characterized in that, described suction realizes by means of a vacuum pump.
22. method as claimed in claim 18 is characterized in that, produces an about negative pressure of 0.15 to 0.7bar below ambient pressure.
23. method as claimed in claim 22 is characterized in that, produces an about negative pressure of 0.2 to 0.40bar below ambient pressure.
24. method as claimed in claim 18 is characterized in that, described packaging film is forming a lapped seam or is sealing under the situation of a fin-shaped seam of formation by welding or sealing.
25. method as claimed in claim 18 is characterized in that, as packaging film, uses a film, it have one according to DIN53122 under 23 ℃ and 85% relative humidity, measure less than 5g/ (m 2* water vapour permeability d).
26. method as claimed in claim 25 is characterized in that, as packaging film, uses a film, it have one according to DIN53122 under 23 ℃ and 85% relative humidity, measure less than 2g/ (m 2* water vapour permeability d).
27., it is characterized in that as claim 18 or 25 described methods, as packaging film, use a film, it has one and be up to 10000cm3/ (m according to what DIN53380-V measured under 23 ℃ and 75% relative humidity 2* gas permeation rate d*bar) for air.
28. method as claimed in claim 27 is characterized in that, as packaging film, uses a film, its gas permeation rate is up to 200cm 3/ (m 2* d*bar).
29. method as claimed in claim 28 is characterized in that, as packaging film, uses a film, its gas permeation rate is up to 20cm 3/ (m 2* d*bar).
30., it is characterized in that as claim 18 or 25 described methods, as packaging film, use a film, it has a disruption characteristic that is at least 100N/15mm of measuring according to DIN EN ISO 527-3.
31. method as claimed in claim 30 is characterized in that, described disruption characteristic is at least 200N/15mm according to DIN EN ISO 527-3 measurement,
32. method as claimed in claim 18 is characterized in that, controls this method like this, is at least 300kg/m thereby obtain one 3Packed bulk density.
CN2007100057300A 2002-04-22 2003-04-22 Highly compressed filter tow bales and process for their production Expired - Lifetime CN101041390B (en)

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