CN1564734A - Extrusion molding process - Google Patents
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- CN1564734A CN1564734A CN 02819803 CN02819803A CN1564734A CN 1564734 A CN1564734 A CN 1564734A CN 02819803 CN02819803 CN 02819803 CN 02819803 A CN02819803 A CN 02819803A CN 1564734 A CN1564734 A CN 1564734A
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Abstract
A molding process is disclosed in which an extruded column (22) of plastic is introduced into a mold cavity having a predetermined surface profile. A region of negative air pressure is created inside the mold cavity, exterior to the extruded column. The negative air pressure is applied to the exterior of the extruded column to draw the extruded column into contact with the entire surface profile of the mold cavity, to produce a molded article. The invention can also include a step of co-extruding multiple types of plastic resulting in an extruded column having multiple layers, to produce a molded article having multiple layers. The present method also includes a step of internally inserting a component into the extruded column at a predetermined position so that it will end up at a predetermined position of the molded article after the molding process.
Description
Cross reference to related application
The present invention requires the right of U.S. Provisional Patent Application of submitting to April 20 calendar year 2001 60/285,196 and the U.S. Provisional Patent Application of submitting to August 20 calendar year 2001 60/313,960.
Background technology
The present invention relates to the extrusion molding technical field, in particular for the moulding massive article.Known have multiple molding methods to be used for forming polymer material product, for example blow moulding.In blow moulding, " parison " (that is, squeezable plastic tube) to be clamp-oned in the mould, pressure-air is blown into the edge that in the mould plastics is extruded onto die cavity.It is known using continuous high speed, high power capacity blow moulding to make bottle.Although this blow moulding is highly suitable for making the small-sized goods as the bottle, yet this method thereby is applicable to anything but and makes large scale plastic product such as plastic plate because himself multiple restriction.When blowing large scale plastic product for example during plastic plate, very there is uneven pulling in Duo zone, particularly at the turning, edge and deep draw place, the result causes the non-constant of the globality of structure.And for the blowing massive article, the extruded parison in the method must have very large diameter, and this has just caused specific substantial limitation.The wall of extruded parison is very thick, can not use blow moulding to blow suitably, and the concentrated weight of plastics will cause lax and elongation.And the degree of inconsistency is higher in final products.
Often wish in moulding article, to add pigment.In standard method, pigment or colorant must be added in the whole polymer.But because the pigment medium needs the plastic material of better quality, or natural or high-quality reclaims plastics, so this method can cause cost too high.Like this, whole goods must be made of expensive material, and it is impossible using not too expensive recovery plastics.It is known using a plurality of layers during as bottle at the small-sized goods of blowing.For example, the plastic bottle that is used for packaged food can have a ultraviolet barrier layer, to be used for the shelf life of food fresh keeping and increase product.Also wish to add colored colorant layer, to avoid the problems referred to above to product.But it is infeasible using the multilayer method when producing most of large-sized object.Known this multilayer method can be successfully used to make has the normally circular large-sized object of simple shape, for example applies a coat of colo(u)r when producing dustbin.But this method of making these objects in most of the cases is step, and discontinuous, needs producers to carry out considerable processing and specific step.
Under situation about being restricted, use blow moulding produce large-sized object for example plastic plate be known.But this method also is step, and discontinuous, needs producers to carry out considerable processing and specific step.And also there are a lot of other problemses in this method.Template making process must be the individual layer method, and wherein goods can only be made of monolayer plastic, does not allow to use the multilayer method.By the various parameters of control, comprise intensity, weight, color and cost like this, and the recovery ratio of anti-skidding validity, Fire retardance, obstruct protection, ultraviolet (UV) protection level and material therefor, it is difficult obtaining benefit and flexibility.And because each goods all must handle separately, and to produce be batch (-type) but not continous way, therefore when waiting for next circulation, the accumulation of polymer in extruder and the extrusion head and long-time in temperature too high, cause the plastic resin degraded.Also there are the problems referred to above in these plates, at the turning, excess elongation appears in edge and deep draw place, and move downward when entering mould excess elongation under the weight effect of himself when extruded parison.And because it is very slow to extrude circulation, the inhomogeneous cooling of extruded parison is even, and cool off gradually with very fast speed its bottom.This will cause blowing inhomogeneous relatively poor with surface finish.
Sheet material with produced in conventional processes often has smooth surface, therefore must adopt additional step could obtain skidproof effect.Spraying or applying the nonskid coating material is common as epoxy resin, solvent or glue.And, coated together with coating sometimes such as the allosome material of sand or rubber scraps, to obtain better frictional force.Knownly insert rubber washer or rubber strip so that non skid matting to be provided at product surface.And, knownly can make it coarse in the converted products surface so that frictional force to be provided.These steps are carried out after product is made, and cause extra production stage.They also can cause other problems.In coating process, epoxy resin, rubber, sand etc. are and the inconsistent material of plastic resin, are expendable, and this is desired just.Also there are same situation in rubber washer or rubber strip, and they are also very expensive and come off easily.Method of surface finish needs equally the big amount of labour, and is not very effective for the processing non skid matting.In addition, the rough surface of machining absorbs dirt and pollutant, and the cleannes that the people is believed can provide enough are carried out food applications with the approval that obtains USDA.
When being provided, the back-fire relief plastic plate runs into similar problem.Resistance fire material is very expensive, and the cost of hybrid resin exceeds four times than the cost of the standard polymers that does not add the back-fire relief additive.The resin that contains the back-fire relief additive is very heavy, and this makes owing to exist the potentiality that damages that it is not wished and be not suitable for transportation and processing.And the product that contains additive that makes is highly brittle, and is very easy to rupture and crack, and causes intensity variation and service life to shorten.Because the quality of desired additives is higher, thereby plastic products are unsuitable for reclaiming, and have further limited widely used original intention.
When producing sheet material and other large-scale moulding articles, other problems also is very important.On the one hand, it is important providing high as far as possible mechanical strength.On the other hand, be desirable to provide impact resistance.This often is to realize by the plastic products of manufacturing structure foam.But, in the structural foam method, foam to entire product, foaming needs to sacrifice a certain amount of rigidity and mechanical strength.In other were used, the obstacle between internal component and the external environment condition usually was the key feature of the product of particular type.A tangible example is the fuel tank that uses in the automobile.Almost barrier material all is very expensive in all cases.And according to the type of used barrier material, there is too heavy or too firm problem in they.Product sold need have antistatic property on some market.Some common industrial requires antistatic property, and for example static can cause spark in chemical industry, thereby causes fire; Static can disturb or damage the sensing electronic component in electronics industry.Antisatic additive is very expensive equally, and physical property is caused adverse effect.
In typical squeeze polymer molding methods, (comprise that blow moulding and other use the profile extrusion method of hollow material), the step of carrying out material and/or fiber are filled into column body is difficult to improve physical property, and described physical property comprises higher intensity, better impact resistance, the better hot strength of bending property and Geng Gao.The difficulty of this packing material and/or fiber limited the type of the polymer product that can produce, also limited instead powerful innovation and the design of being done of more preferably selecting, comprised the polymer supporting structure of making polymer architecture post or other types for polymeric articles.
The filled and process material can provide have better impact resistance, high insulation values, high stretching and the polymer product of bending strength.But, in typical molding methods, material is comprised that it is the wait a moment method of speed of a kind of very trouble, cost height that foamed material is filled in the internal cavities of layered product, makes final products have less-than-ideal quality.Usually the common method of packing material is that rotational molding and/or carbamate batch mix and filling, and this is a very expensive and method at a slow speed.
When using typical molding methods, known when fiber (natural or synthetic) is sneaked in the polymer as glass fibre or hemp and sent into the molding mechanical system (for example but be not limited to extruder, accumulator, injection port etc.), fiber has the propensity of arranging along equidirectional.The tendency of fiber alignment has caused unwanted results, comprises that the maximum intensity, stretching of fiber embedding polymer and bending property reduce, and face crack increases with fragility and increases.
In typical molding methods, hope can or embed colour or transparent strip adding and be used for identification or aesthetic purposes in the molded polymeric goods.But, use the product of above-mentioned typical extrusion molding explained hereafter can't obtain this segmentation system.
Summary of the invention
Molding methods of the present invention can overcome difficulty and the defective that exists in previous method and the product, in molding methods of the present invention, the plastics squeezing rod is put into the die cavity with predetermined surface profile.In die cavity inside, the outside negative pressuren zone that forms of squeezing rod.Negative pressure puts on the outside of squeezing rod, thereby the pulling squeezing rod makes it to contact with the whole surface profile of die cavity, to produce moulding article.The present invention also comprises the step of the multiple plastics of co-extrusion pressure (co-extruding), obtains having a plurality of layers squeezing rod, has a plurality of layers moulding article with production.The inventive method also comprises the step to the precalculated position of squeezing rod inside insertion element, so that this element rests on the precalculated position after moulding process finishes.
Should recognize that the present invention can have other different embodiments, not depart under the situation of the present invention that its some details can change in all fields.Therefore, accompanying drawing and description should be considered to illustrative and nonrestrictive.
Description of drawings
Figure 1A, 1B and 1C represent to can be used in the inventive method respectively and use this method to make the of the present invention exemplary extruder of goods and the side view and the cross-sectional view of exemplary extrusion head.
Fig. 2 is the vertical view that adopts the board product of the inventive method production.
Fig. 3 A, 3B and 3C are strabismus stereograms, and the interior details of the board product of the inventive method production is adopted in expression.
Fig. 4 A, 4B, 4C and 4D are respectively top perspective view, sectional view, partial enlarged drawing and the oblique views that adopts the board product of the inventive method production.
Fig. 5 A, 5B, 5C and 5D are respectively sectional view, oblique view, upward view and the bottom sectional view that adopts the board product of the inventive method production.
The specific embodiment
Describe the present invention below in conjunction with accompanying drawing, should be appreciated that identical Reference numeral is represented components identical in institute's drawings attached.The present invention is directed to a kind of method that moulding has the large-sized object of sandwich construction that is used for, with the benefit that obtains using previous method to obtain.Owing to control in the squeezing rod carefully and malleation and negative pressure in the die cavity outside the squeezing rod, the problem that used system existed before the present invention had overcome.This method still is a kind of continuity method, has reduced treatment step, has improved productivity ratio.Whole method of work comprises the supply plastic raw materials, and through the multilayer extrusion head these materials is extruded.Produce continuous multilayer squeezing rod, it has satisfy special applications functional and requires necessary single or multiple lift structure.This method comprises that also one is used for mechanism is inserted in the inside that needs object to insert in the squeezing rod.Use has the multi-mould wheel of the continuous rotation of punching press and conveying mechanism.To describe the step and the feature of the method below in detail.
This method is preferred for producing multi-layer product, but never only limits to produce this based article.Produce in the application of multi-layer product in hope, use the mould machine that comprises a plurality of feed hoppers, an extruder that is used for each layer of moulding sent into one or more materials by each feed hopper.When the production single-layer products,, usually other feed hopper/extruders all cut out except a feed hopper/extruder.Each feed hopper has all been installed logolmeter, enters the introducing amount of the material in each feed hopper with control.Measurement is based on the weight or volume ratio, and material can be the combination of liquid, sheet, tabular, concentrate, powder and pre-fusion plastics.The type at extruding station and number depend on function and the type that is introduced into the layer in the end article.
Figure 1A is the exemplary description to extruder of the present invention and mould machine 10.Described machine 10 comprises one or more extruder 12, and described extruder is according to the kind of desired extruding volume and polymeric material and the extruder of optional different sizes.Extruder 12 comprises one or more extruder screws that are used to provide the extruded polymer post.According to the physical property (as viscosity etc.) of the concrete kind of the polymer that will be extruded, extruder screw can be chosen twin-screw 14 or single screw rod 16 wantonly.Every extruder 12 all comprises an extruder motor 18 that is used to drive extruder screw.
As the expression especially in detail of institute among Figure 1B and the 1C, described machine 10 comprises an extrusion head 20, is used to receive the product and the production multilayer squeezing rod 22 of each extruder 12.Of course it is to be understood that not departing under the situation of the present invention, also can extrude the individual layer squeezing rod.Extrusion head 20 comprises a main part 28 that preferably has a plurality of concentric column chamber 26, and wherein extrude material in each post chamber 26 from each extruder 12, thereby makes multilayer squeezing rod 22.Squeezing rod 22 is squeezed in the machine die 24 of one or more moulding moulding articles.
As specific characteristic of the present invention, described machine 10 and extrusion head 20 comprise that also one is used for mechanism 30 is inserted in the inside that object inserts in the polymeric columns.Also be provided with physical mechanism 32, be used for forming band at the squeeze polymer post.Band mechanism 34 is set, is used for band attached to the squeeze polymer post.Fiber mixed zone 36 is set, is used to make the random arrangement of fiber.Internal material applicator 38 is set, is used to smear internal material.The multi-level injection cast gate 40 of separation is set, is used for independent multi-level injection.Below with reference to specific application these assemblies are discussed in further detail.
Described multilayer extruder produces plastics squeezing rod 22, and this squeezing rod preferably has around the sandwich construction of the axle concentric arrangement of squeezing rod 22.The sandwich construction of squeezing rod 22 can have various geometric cross-sections, circular or oval cross section.Can extrude a plurality of layer, thereby obtain the predetermined variation of the layer thickness on level, vertical and/or diagonal angle cross section.
When mould was closed around squeezing rod, air was axially charged into through the center of squeezing rod, and remains on the minimum direct draught of weight to prevent that cylinder from toppling over of enough counteracting squeezing rods.When squeezing rod enters mould, will be evacuated in the die cavity, with this cylinder of moulding.This mould comprises a plurality of vacuum ports that are positioned at specific key position, is used for negative pressure is pumped in the outside of squeezing rod, thereby cylinder sucked the turning and the edge of mould, and in all corners and crack of die cavity.Vacuum port produces the specific region in having the mould of different negative pressure.The zone that produces bigger vacuum has the stronger suction that cylinder is attracted to this direction, and the zone that has than rough vacuum produces more weak suction.When negative pressure optionally put on the squeezing rod outside, malleation put on squeezing rod by inside.Like this,, inner pressing mechanism is combined with outside vacuum device, provide meticulous pressure to safeguard in order to control the shape of product molding carefully for final expectation.
In order to keep maximum wall thickness and to strengthen outward flange, mould and squeezing rod are designed to " to have burr " around end article or " not having burr ".For decorating or functional reason, when hope " does not have burr ", molding mechanism will be designed to realize required minimum stretch or not stretch.In traditional blowing mechanism, edge and turning charge into gas, by tension-thining by mistake, produce the structure atenuator region.But, owing to do not have the internal pressure load to be applied on the burr line, so in the inventive method this problem can not appear.In fact, use method of the present invention, it is thicker and more solid that the burr line can become, and can not produce the breakaway poing that blow-molded article occurs.
By pressing and external pressure in the control carefully, squeezing rod is formed as the shape of expectation and still keeps each layer in a plurality of layers to have the thickness of expectation, and thickness or distribution that can breakable layer.Like this, guarantee can not occur in the end article the blocked up or thin excessively zone of wall by control.
And, because pressure takes place by dynamic the variation, produce therefore that to have inner whole cavity, part cavitys or do not have the end article of cavity at all be possible in whole process.This internal cavities has some function.Overall weight becomes gentlier and higher mechanical strength is provided simultaneously.This just provides operational facility and has reduced the potential injury relevant with work.And, also can reduce as the cost of a factor of material therefor.In addition, subsideing the stagnation chamber is very effective for isolating purpose, makes these goods can be used to produce box and bag that food and medicine already use ideally.
In the manner described above, should be appreciated that the method and traditional " blow moulding " have very big difference.By controlling above-mentioned pressure, squeezing rod is carried out " pushing away/draw " control.Although keep a little malleation to topple over to prevent cylinder in cylinder, the method applies negative pressure by the outside and finishes.
As mentioned above, after the squeezing rod loading mould cavity, wheel turns is connected to next mould with extrusion head, repeats this process in next mould continuously.When taking out from mould when continuous cooling moulding article and with it, they are transported to follow-up station and are removed burr.After removing burr, goods are just produced and are finished, and prepare to be used for final use.
The type of multilayer
As mentioned above, end article preferably includes the combination of multilayer, includes, but are not limited to each layer of following type.Can select the type of layer and the requirement of extruder is used for certain products to use, thereby form the market (for example plastic plate) of customed product, these products are customized for any suitable purposes.
Pigment/colorant layer: adopt described multilayer method, the external pigment layer that one deck approaches can be coated in the main part of goods, this coat of colo(u)r can be made of cheap salvage material.This thin layer can be to satisfy the pigment requirement and the too high necessary any form of cost that can not cause pigmentary material to the producer.And pigment/colorant can join other any layer or additives that are arranged in the goods outside, brings further saving.Common extruder may be used to push this layer.
Skid resistant course: any skid resistant course can form around structure.For example, the linea low density polymeric layer can be used as the outside that skid resistant course adds the bottom (typically having high density) that is made of same material.For example, it is external that Rou Ruan frictional property low density polyethylene (LDPE) skid resistant course can be applied to the rigid structure of high density polyethylene (HDPE).This application of the method has many favourable parts.This layer is global formation, do not need extra work and processing.Unlike the former skid resistant course of type, but because this skid resistant course has the polymeric matrix of different densities of the same race, thereby do not need to peel off or separate from bottom, thereby desirable bonding is provided.Because these layers all are to be made of thermoplastic of the same race, thereby these goods can reclaim fully.Use the desirable frictional behaviour of the skid resistant course that this method obtains to regulate easily by the density of regulating resin, to satisfy the requirement of particular consumer, because the frictional behaviour of resin is the function of molecular density.Formed skid resistant course is smooth and be easy to cleaning, thereby meets FDA and USDA requirement that sheet material is used.This skid resistant course can also be a color-match, to be used as coat of colo(u)r.Common extruder may be used to push this layer.
Flame retardant bed: by applying a flame retardant bed, whole cost can not use expensive additive by the protection thin layer that plays the back-fire relief effect equally is provided and reduces greatly in entire product.Stratification has also solved weight issue like this.In order to reduce the fragility problem as far as possible---fracture, crackle and structure problem, in flame retardant bed, form special intensity layer, so that the extra support of required necessity to be provided, or, realizes flame retardant bed by being clipped between each layer.When only using thin layer, because the amount of the back-fire relief additive that uses is considerably less, the recuperability of product still is acceptable.Common extruder may be used to push this layer.
The intensity layer: when forming specific intensity layer, use a kind of two independent aspects of technology.This multilayer method itself provides the extra mechanical strength a kind of internal performance of knowing as multilayer material.And, can form specific intensity layer, make polymer more solid and still recyclable.In order to reach requirement of strength, can in polymer, sneak into for example hemp of long glass fiber bundle, nylon bundle and/or other natural rubbers.The material that is used for this layer can be nylon, polyethylene or polypropylene.For length and the integrality that keeps fibre bundle, extruder can comprise a fed downstream device, and this feeder makes the distance of being flowed through under the screw rod shearing effect of fibre bundle in extruder reach minimum.Another selection of introducing the intensity layer is only to use nylon to be used for this intensity layer as engineering polymers, and reason is the high strength of nylon inherence.The benefit of introducing the intensity layer is very many.The intensity layer can compensate the low structural strength of other layers, thereby uses unique feature and material, obtaining functional application, and for example anti-skidding, back-fire relief etc.
Froth bed: can provide one deck to be used for shock resistance, insulate, reduce the froth bed of weight and fill volume.Described multilayer method provides the rigidity and the shock resistance level of expectation by the thickness that changes material and froth bed and non-foam layer.The outer foam layer also can be used as coat of colo(u)r, skid resistant course and intensity layer.And most of internal layers all have the flexibility of using natural material or salvage material.Provide froth bed also to can be used for an additional function.The thickness that changes foam degrees and froth bed by combined type ground can realize the insulating raising of the factor and reducing of weight.In specific concrete application, it is effective that foaming is filled for the capacity of cavity.Foaming layer can also improve mechanical strength, and favourable quality ratio is provided.Foam introduced two kinds of typical methods in the plastics.A kind of method is to use the standard extruder, at feed hopper or downstream position CBA is mixed with plastics.Another kind method is introduced nitrogen in the centre or the downstream of extruder.If the use froth bed, the concrete positive hydraulic pressure (air pressure or another kind of material pressure) that then puts on the squeezing rod is crucial for the expectation foam degrees that is kept for froth bed with the expection thickness that guarantees layer.
The barrier layer: special encapsulant can be coated in the goods outside and ooze out or move from main part to stop content such as water or solvent.This barrier material also can be used in combination with coat of colo(u)r or other layers.Typical extruder can be used for this purpose.By using a spot of barrier material to guarantee suitable stopping, the cost of raw material reduces greatly, particularly for large-scale plastic products.And according to the type of used barrier material, if use in whole goods, these materials may have too expensive and too heavy or too firm problem.Owing to only needs one deck barrier material, rather than in whole goods, use this material, thereby there are not the problems referred to above in the method.
Tack coat: a tack coat can be provided, incompatible and each layer that can not bond together are well glued as polyethylene layer and nylon layer.Have between the well natural close-burning layer if compatibility material is used in, then do not need to use this tack coat.Common extruder can be used for pushing this layer.
Antistatic layer: be not to use expensive antisatic additive as traditional plastic method in whole goods, the inventive method provides an outside antistatic cover layer of saving cost greatly.This antistatic layer has special application, only for some industry for example the chemistry and electronics industry be very important.Common extruder can be used for pushing this layer.
The UV layer: described multilayer method allows to introduce one or more layers outside UV layer, provides the effective protection to polymer product, to prevent the harmful ultra-violet radiation from the sun.Because the UV additive of high concentration can add the goods outside and be used to obtain better UV protection effect, and can not cause the unnecessary destruction to physical property, it is more more favourable than add the UV additive in whole polymer product that therefore outside UV layer is provided.And the UV additive of low concentration can be used on the adjacent outer field layer, thereby reduce the consumption of additive, to adapt to the UV amount of penetrating that has reduced under the product surface.Stop that by save using the additive of UV saved great amount of cost.
Insulating barrier: can in this multilayer method, introduce insulating barrier, thereby fabulous insulation effect is provided.This insulating barrier can be used as the separation layer cold and hot to the outside, perhaps is used for keeping inner cold and hot.Insulation system can be froth bed, stagnation chamber layer and/or other special insulation material layers.In order to reach optimum efficiency, can in same moulding article, use the combination of several insulating barriers.
The sound layer: can similarly in the multilayer method, introduce the sound layer, to reach the purpose that obtains different sound effects.Audio layer (sound layer) includes, but are not limited to sound-deflection layer, acoustic absorption layer, sound attenuating layer and sound enhancement layer.Can obtain these effects (and combination) by using dissimilar materials (foamed material or non-foam material) or cavity layer.These layers can be positioned on outer surface or the inner surface, and in internal layer.In order to reach optimum efficiency, can in same moulding article, use the combination of several sound layers.
According to the particular requirement of particular product such as sheet material, which floor can be merged into one deck.For example, coat of colo(u)r also can be a skid resistant course; Flame retardant bed also can randomly be incorporated coat of colo(u)r into.And the intensity layer can be foaming or non-foaming.According to specification, all each layers can be made of recovery, secondary (widespec) or natural material.
Use multilayer method of the present invention can also obtain other benefits.By using the multilayer extruding, can produce than the bigger squeezing rod that uses single extruder to obtain, with the bigger end article of preparation.Estimate that multilayer method of the present invention per hour can extrude the plastics greater than 10000lbs (4530kg), thereby speed of production is higher, even all layers all are made of same material.In order to select to push size and extrusion speed, optionally closing one or more extruders, to produce small-sized squeezing rod also be feasible.Like this, multilayer method of the present invention provides flexibility and the control of adopting previous method to obtain.
The inner mechanism that inserts
As a specific characteristic of the present invention, in process of production, by certain device or other elements are inserted within the squeezing rod inwall or on or even whole goods in, this device or element can be inserted in the final polymer product by inside.This device can be that rfid device (RFID), bar code or other are used to follow the tracks of and identifying purpose or the device of other any desired functions is provided.This device can also comprise a solid-state microchip that has information, and this chip can be hard coded or erasable.This device can also comprise meritorious power supply of a usefulness or the transponder by passive reflective operation.This device can be used the operation of sounding (sonometric) or magnetic read-write system, perhaps make use up, the electromagnetic spectrum of radio frequency or another wave band operates.In this continuous automated procedure, this device is inserted into the inwall of squeeze polymer post in process of production.Aforesaid operations preferably before moulded products, lifts this device by using mechanical arm, and it is put into extrusion head through an opening, then enters in the squeezing rod and finishes.By suitably this device being placed on the specific part of squeezing rod, when adopting the method that squeezing rod is made net shape, this device finally can rest on the desired locations in the end article.
The internal material applicator
Specific characteristic of the present invention is to have used " the internal material applicator " 38 of putting into the internal cavities of squeeze polymer post via the opening of extrusion head.Can optionally change the specific design of applicator 38 according to one or more type of material and/or the degree that is used in the fiber type on the moulding article and smears.
In concrete an application, can use the foamed material filler.Applicator 38 preferred top are equipped with the axle of feeding line, and this flows to nitrogen, chemical substance or other materials the material of the axle system of flowing through.Flow through this and the opening on axle when being thrown to the inwall of squeezing rod when foamed material, can successfully introduce one deck foamed material or whole foamed material fillers.
According to a further aspect in the invention, fibrous material can be introduced in the squeezing rod.In this embodiment, applicator 38 preferably is configured to and fiber can be overlayed on the inwall of cylinder.As example (the present invention is not limited to this), can use the short spraying applicator of cutting, thereby it can rotate fiber is thrown on the inwall.
According to another aspect of the invention, can smear one or more thermosets by inside.In this embodiment, former stockline is designed to hold the A/B mixture of chemical substance, as the mixed thermosetting mixture of the mixture applicator of flowing through downwards, be thrown on the inwall via opening, form an internal layer or the inner space of complete filling cavity randomly separately.These inner introducing materials and/or fiber provide considerable advantage to end article, comprise extra intensity, impact and bending and tensile property, and by selecting various types of materials to give other expected performances of goods.
Independent multi-level injection
In accordance with a further aspect of the present invention, a specific characteristic of the present invention shows as an independent injecting systems that independent multi-level injection cast gate 40 is housed, and when pushing squeezing rod 22 owing to close die, this cast gate is inserted in the bottom of mould.When injecting systems plugs on the mould, the injection pin of injecting systems will pass one or more layers polymer wall and one or more materials will be filled in one or more internal cavities.And injecting systems is equipped with self sealss mechanism, makes when extracting the injection pin hole closure.Described independent multi-level injection can carry out in the continuous process of preferred implementation or configuration, carry out in the stage at an independent or follow-up molding after also can finishing at the initial molding to goods.
The random arrangement of fiber
According to another aspect of the present invention, a specific characteristic of the present invention is provided and uses, and wherein fiber is sneaked in the molten polymer.In this embodiment, the molten polymer that is mixed with fiber is pushed process " fiber mixed zone " 36, the random here arrangement of fiber.Can in all sorts of ways and realize this mixing.On the one hand, can will have the static mixer and the extrusion head of various design forms merge, preferred but be not limited to low shearing-type blender.On the other hand, cross pointer passage can be set in extrusion head, be extruded carry out random mixing before, polymer is pushed this passage of flowing through.The design of the random arrangement of fiber is applicable to all polymer in-mold molding process, includes, but are not limited to the multilayer method of molding.In this multilayer method, can set up " fiber mixed zone " and be arranged on ideally in the post chamber 26 of one or more loosen collagen fibre encapsulating layer, or near the mouth of multilayer extrusion head 20.
Strap system
According to another aspect of the present invention, a specific characteristic of the present invention is mechanism 34, and it is used for when squeezing rod comes out one or more bands being overlayed on squeezing rod.Use one or more colour band on the cylinder and one or more band is pressed onto on the still ice-cold wall, thereby one or more bands are overlayed on the outside of squeezing rod.Perhaps, provide an observation window band, an independent window material bar 32 of extruding is passed one or more layers extrusion head setting in order to give the single or multiple lift squeezing rod.According to the desired use of band, transparent or color material can be extruded through the extruding window.For example, can use transparency window in the predetermined moulding article that contains liquid, to provide for example liquid water level monitor.
As mentioned above, the invention solves many problems of the device existence of type in the past.But, should be appreciated that those skilled in the art in principle of the present invention and scope, for will in accompanying Claim, explaining for the various variations of being made of arranging of explaining details, material and parts that essence of the present invention is described and set forth.
Claims (79)
1, a kind of molding methods, it may further comprise the steps:
The squeeze polymer post is put into die cavity with predetermined surface profile;
In die cavity inside, the outside negative pressuren zone that forms of squeezing rod;
Apply negative pressure for the squeezing rod outside, the pulling squeezing rod makes its outside contact with the whole surface profile of die cavity, to form moulding article.
2, molding methods as claimed in claim 1, it further is included in the step that keeps predetermined malleation in the squeezing rod, to prevent that collapse in the inside of squeezing rod when applying negative pressure.
3, molding methods as claimed in claim 2, wherein in moulding process, malleation and negative pressure are controlled dynamically.
4, molding methods as claimed in claim 2 wherein keeps the step of predetermined malleation to be included in the step that forms internal cavities in the moulding article.
5, molding methods as claimed in claim 1, wherein in moulding process, negative pressure is controlled dynamically.
6, molding methods as claimed in claim 1, the step of wherein putting into a squeezing rod comprise that the step of the multiple plastics of co-extrusion pressure, this step cause squeezing rod to have a plurality of layers, thereby form the moulding article with a plurality of layers.
7, molding methods as claimed in claim 6, the one deck at least in wherein a plurality of layers is selected from the group that comprises following each layer: intensity layer, coat of colo(u)r, skid resistant course, flame retardant bed, block protective layer, tack coat, froth bed, antistatic layer, recovery plastic layer, UV barrier layer, insulating barrier and sound layer.
8, molding methods as claimed in claim 1, wherein squeezing rod is extruded continuously, and forms die cavity at mould inside, and described mould is one of a plurality of moulds that all have die cavity, wherein selectively moving moulds makes it to combine with squeezing rod, thereby continuous, automatic moulding process are provided.
9, molding methods as claimed in claim 8, wherein a plurality of moulds are supported on the continuous supporting mechanism.
10, molding methods as claimed in claim 9, wherein continuously supporting mechanism comprise the wheel that is used for supporting a plurality of moulds or shuttle at least both one of.
11, molding methods as claimed in claim 1, wherein squeezing rod is propped up, and collapses to prevent the machinery in moulding process.
12, molding methods as claimed in claim 1 wherein applies negative pressure and comprises the step of squeezing rod being inserted die cavity edges with the step that spurs squeezing rod.
13, molding methods as claimed in claim 1, it further comprises the step of an element by the precalculated position of inside insertion squeezing rod, makes this element can rest on the precalculated position in the moulding article after moulding process.
14, molding methods as claimed in claim 1, wherein the predetermined surface profile of die cavity is tabular, thereby moulding article also is tabular.
15, molding methods as claimed in claim 1, it further comprises the step that a kind of material is coated in squeezing rod inside by inside.
16, as the molding methods of claim 15, wherein the material of inner coating is at least one fibrid.
17, as the molding methods of claim 15, wherein the material of inner coating is an expanded material.
18, as the molding methods of claim 15, wherein the material of inner coating is the thermosetting mixture.
19, molding methods as claimed in claim 1, wherein squeezing rod contains a kind of fiber embedded material, also comprises the fiber embedded material is sneaked into step in the squeezing rod, thereby forms by the random arrangement of embedding fiber.
20, molding methods as claimed in claim 1, it further comprises a kind of packing material is expelled to step in the internal cavities of moulding article.
21, as the molding methods of claim 20, it further comprises the step of self sealss moulding article.
22, molding methods as claimed in claim 1, it further comprises at least one band is overlayed on step on the squeeze polymer post.
23, as the molding methods of claim 22, wherein when at least one colour band overlayed on squeeze polymer post outside, at least one band was attached on the cylinder.
24, as the molding methods of claim 22, wherein at least one band disconnects at least a portion of squeeze polymer post jamb.
25, a kind of molding methods, it may further comprise the steps:
The multiple plastics of co-extrusion pressure, the squeezing rod that has multilayer with formation;
The plastics squeezing rod is put into cavity with predetermined surface profile;
The pulling squeezing rod makes its outside contact with the whole surface profile of die cavity, has the moulding article of multilayer with formation.
26, as the molding methods of claim 25, the step that wherein spurs the squeezing rod outside may further comprise the steps:
In die cavity inside, the outside negative pressuren zone that forms of squeezing rod;
Apply negative pressure for the outside of squeezing rod, contact with the whole surface profile of die cavity with the outside that spurs squeezing rod.
27, as the molding methods of claim 25, it further is included in the inner step that keeps predetermined malleation of squeezing rod, to prevent that collapse in the inside of squeezing rod when applying negative pressure.
28, as the molding methods of claim 27, wherein in moulding process, malleation and negative pressure are controlled dynamically.
29,, wherein keep the step of predetermined malleation to be included in the step that forms internal cavities in the moulding article as the molding methods of claim 27.
30, as the molding methods of claim 25, wherein in moulding process, negative pressure is controlled dynamically.
31, as the molding methods of claim 25, the one deck at least in wherein a plurality of layers is selected from the group that comprises following each layer: intensity layer, coat of colo(u)r, skid resistant course, flame retardant bed, block protective layer, tack coat, froth bed, antistatic layer, recovery plastic layer, UV barrier layer, insulating barrier and sound layer.
32, as the molding methods of claim 25, wherein squeezing rod is extruded continuously, and forms die cavity at mould inside, and described mould is one of a plurality of moulds that all have die cavity, wherein selectively moving moulds makes it to combine with squeezing rod, thereby continuous, automatic moulding process are provided.
33, as the molding methods of claim 25, wherein squeezing rod is propped up, with prevent the mechanical stretching in moulding process and collapse at least both one of.
34,, wherein apply negative pressure and comprise the step of squeezing rod being inserted die cavity edges with the step that spurs squeezing rod as the molding methods of claim 25.
35, as the molding methods of claim 25, wherein the predetermined surface profile of die cavity is tabular, thereby moulding article also is tabular.
36, as the molding methods of claim 25, it further comprises the step that a kind of material is coated in squeezing rod inside by inside.
37, as the molding methods of claim 36, wherein the material of inner coating is at least one fibrid.
38, as the molding methods of claim 36, wherein the material of inner coating is an expanded material.
39, as the molding methods of claim 36, wherein the material of inner coating is a thermosets.
40, as the molding methods of claim 25, wherein squeezing rod contains a kind of fiber embedded material, also comprises the fiber embedded material is sneaked into step in the squeezing rod, thereby forms by the random arrangement of embedding fiber.
41, as the molding methods of claim 25, it further comprises a kind of packing material is expelled to step in the internal cavities of moulding article.
42, as the molding methods of claim 41, it further comprises the step of self sealss moulding article.
43, as the molding methods of claim 25, it further comprises at least one band is overlayed on step on the squeeze polymer post.
44, as the molding methods of claim 43, wherein when at least one colour band overlayed on squeeze polymer post outside, at least one band was attached on the cylinder.
45, as the molding methods of claim 43, wherein at least one band disconnects at least a portion of squeeze polymer post jamb.
46, a kind of molding methods, it may further comprise the steps:
Extrude an extruded polymer post;
An element is put into the precalculated position of squeezing rod by inside;
Squeezing rod is put into die cavity with predetermined surface profile;
The molding squeezing rod makes it contact with the whole surface profile of die cavity, to form moulding article;
The control molding step makes this element rest on the precalculated position in the moulding article behind moulding process.
47, as the molding methods of claim 46, the step of wherein controlling molding step comprises:
In die cavity inside, the outside negative pressuren zone that forms of squeezing rod;
Apply negative pressure for the outside of squeezing rod, contact with the whole surface profile of die cavity with the outside that spurs squeezing rod.
48, as the molding methods of claim 47, it further is included in the inner step that keeps predetermined malleation of squeezing rod, to prevent that collapse in the inside of squeezing rod when applying negative pressure.
49, as the molding methods of claim 48, wherein in moulding process, malleation and negative pressure are controlled dynamically.
50,, wherein keep the step of predetermined malleation to be included in the step that forms internal cavities in the moulding article as the molding methods of claim 48.
51, as the molding methods of claim 46, wherein in moulding process, negative pressure is controlled dynamically.
52, as the molding methods of claim 46, the step of putting into a squeezing rod comprises that the step of the multiple plastics of co-extrusion pressure, this step cause squeezing rod to have a plurality of layers, thereby forms the moulding article with a plurality of layers.
53, as the molding methods of claim 52, wherein the one deck at least in the multilayer is selected from and comprises the group of interlayer: intensity layer, coat of colo(u)r, skid resistant course, flame retardant bed, block protective layer, tack coat, froth bed, antistatic layer, recovery plastic layer, UV barrier layer, insulating barrier and sound layer.
54, as the molding methods of claim 46, wherein squeezing rod is extruded continuously, and forms die cavity at mould inside, and described mould is one of a plurality of moulds that all have die cavity, wherein selectively moving moulds makes it to combine with squeezing rod, thereby continuous, automatic moulding process are provided.
55, as the molding methods of claim 54, wherein a plurality of moulds are supported on the continuous supporting mechanism.
56, as the molding methods of claim 55, wherein continuously supporting mechanism comprise the wheel that is used to support a plurality of moulds or shuttle at least both one of.
57, as the molding methods of claim 56, wherein squeezing rod is propped up, and collapses to prevent the machinery in moulding process.
58,, wherein apply negative pressure and comprise the step of squeezing rod being inserted die cavity edges with the step that spurs squeezing rod as the molding methods of claim 46.
59, as the molding methods of claim 46, wherein the predetermined surface profile of die cavity is tabular, thereby moulding article also is tabular.
60, as the molding methods of claim 46, it further comprises the step that a kind of material is coated in squeezing rod inside by inside.
61, as the molding methods of claim 60, wherein the material of inner coating is at least one fibrid.
62, as the molding methods of claim 60, wherein the material of inner coating is an expanded material.
63, as the molding methods of claim 60, wherein the material of inner coating is a thermosets.
64, as the molding methods of claim 46, wherein squeezing rod contains a kind of fiber and sneaks into material, also comprises the fiber embedded material is sneaked into step in the squeezing rod, thereby forms the random arrangement that is comprised fiber.
65, as the molding methods of claim 46, it further comprises a kind of packing material is expelled to step in the internal cavities of moulding article.
66, as the molding methods of claim 65, it further comprises the step of self sealss moulding article.
67, as the molding methods of claim 46, it further comprises at least one band is overlayed on step on the squeeze polymer post.
68, as the molding methods of claim 67, wherein when at least one colour band overlayed on squeeze polymer post outside, at least one band was attached on the cylinder.
69, as the molding methods of claim 67, wherein at least one band disconnects at least a portion of squeeze polymer post jamb.
70, a kind of molding methods, it may further comprise the steps:
Extrude an extruded polymer post;
A kind of material is coated in the inside of squeezing rod by inside;
Squeezing rod is put into die cavity with predetermined surface profile;
The molding squeezing rod makes it contact with the whole surface profile of die cavity, to form moulding article.
71, as the molding methods of claim 70, wherein the material of inner coating is at least a fiber type.
72, as the molding methods of claim 60, wherein the material of inner coating is an expanded material.
73, as the molding methods of claim 60, wherein the material of inner coating is a thermosets.
74, a kind of molding methods, it may further comprise the steps:
Extrude an extruded polymer post, wherein squeezing rod contains the fiber embedded material;
The fiber embedded material is sneaked in the squeezing rod, thereby form by the random arrangement of embedding fiber;
Squeezing rod is put into die cavity with predetermined surface profile;
The molding squeezing rod makes it contact with the whole surface profile of die cavity, to form moulding article.
75, a kind of molding methods, it may further comprise the steps:
Extrude an extruded polymer post;
Squeezing rod is put into die cavity with predetermined surface profile;
The molding squeezing rod makes it contact with the whole surface profile of die cavity, to form moulding article;
Packing material is expelled in the internal cavities of moulding article.
76, as the molding methods of claim 75, it further comprises the step of self sealss moulding article.
77, a kind of molding methods, it may further comprise the steps:
Extrude an extruded polymer post;
At least one band overlayed on the squeeze polymer post;
Squeezing rod is put into die cavity with predetermined surface profile;
The molding squeezing rod makes it contact with the whole surface profile of die cavity, to form moulding article.
78, as the molding methods of claim 77, wherein when at least one colour band overlayed on squeeze polymer post outside, at least one band was attached on the cylinder.
79, as the molding methods of claim 77, wherein at least one band disconnects at least a portion of squeeze polymer post jamb.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31396001P | 2001-08-20 | 2001-08-20 | |
| US60/313,960 | 2001-08-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1564734A true CN1564734A (en) | 2005-01-12 |
Family
ID=34519809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02819803 Pending CN1564734A (en) | 2001-08-20 | 2002-04-19 | Extrusion molding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1564734A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108312578A (en) * | 2017-12-19 | 2018-07-24 | 常州新创航空科技有限公司 | Rotating mould |
-
2002
- 2002-04-19 CN CN 02819803 patent/CN1564734A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108312578A (en) * | 2017-12-19 | 2018-07-24 | 常州新创航空科技有限公司 | Rotating mould |
| CN108312578B (en) * | 2017-12-19 | 2023-11-14 | 常州新创航空科技有限公司 | Rotary die |
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