Apparatus and method for preparing laminated nano-composite material

Apparatus and method for preparing laminated nano-composite material. The apparatus comprising: a plasticizing-and-feeding device assembly consisting of n plasticizing-and-feeding devices; a current collector having n inlets, one outlet and a conjunction runner; k laminated composite generators connected in series, wherein each generator comprises one melt inlet channel, m branch laminated runners and one melt outlet channel, while the vicinity of each melt inlet channel is provided with m distributary openings, and each branch laminated runner can make each equal composite melt that flows out from each distributary opening rotate approximately 90 degrees and extend in width as it flows forward, and then join together and form a laminated structure melt, and the laminated structure melt which joins together at the melt outlet channel of the last laminated composite generator has n×mk layers; and a forming device connected in series to the melt outlet channel of the last generator.

RELATED APPLICATIONS

This patent arises from the U.S. national stage application of International Patent Application PCT/CN2010/078873, having an International Filing Date of Nov. 18, 2010, which is hereby incorporated by reference in its entirety. International Patent Application PCT/CN2010/0788873 claims priority from Chinese Patent Application No. 200910237622.5, filed on Nov. 20, 2009, and Chinese Patent Application No. 201010246370.5, filed on Aug. 6, 2010. The above-referenced applications are hereby incorporated by reference in their entireties.

FIELD OF THE DISCLOSURE

The present disclosure relates to the field of polymer material forming processing, and particularly, to an apparatus and a method for preparing laminated nano-composite material, which prepare multi-layer composite structure polymer materials and products using a method of composite extrusion or composite injection molding.

BACKGROUND

Due to the distinct advantages in the aspects such as mechanical property, barrier property, electrical conductivity and optical property, the laminated nano-composite material has a promising application prospect and attracts more and more attentions. Usually, the micro-laminated nano-composite material with high barrier property is produced and processed using the methods such as dry composition, multi-layer co-extrusion and in-mold lamination.

The multi-layer co-extrusion composition methods disclosed by the Chinese patents No. CN2897642 and No. CN200620101646.X have the advantages of raw materials saving and diversifiable. However, the traditional technology of multi-layer co-extrusion composition also has its disadvantages, i.e., the number of layers is small and the layer thickness cannot be too thin, and the usage amount of the barrier material shall be increased in case the barrier property of the composite material needs to be improved, thereby increasing the production cost.

The Chinese patent No. CN200610022348.6 discloses a branch laminator which produces laminated composite materials using an in-mold lamination method. The current in-mold lamination methods basically belong to the type of extrusion die. With respect to the layering principle, the early technical solution mainly adopts the multi-channel mode in which each channel controls one layer. The structure design is too complex, the number of layers is small, the final composite material has the adhesive layer on the surface, and the thicknesses of respective layers are uneven, thus the service properties of the material will be influenced.

Thus, in order to obtain laminated micro-nano-composite material with excellent properties, a more effective solution shall be found to overcome the above defects.

The above technical contents are incorporated herein by reference.

SUMMARY

An object of the present disclosure is to provide an apparatus for preparing laminated nano-composite material, which has higher division efficiency, achieves a better flow symmetry, and causes less pressure loss during the layering process.

Another object of the present disclosure is to provide a method for preparing laminated nano-composite material, which has higher division efficiency, achieves a better flow symmetry, and causes less pressure loss during the layering process.

The above objects can be implemented by the following technical solutions:

An apparatus for preparing laminated nano-composite material, comprising: a plasticizing-and-feeding device assembly having n plasticizing-and-feeding devices; a current collector having n inlets and an outlet, wherein each of the inlets are in communication with corresponding ones of the plasticizing-and-feeding devices, and there is a conjunction runner between the inlet and the outlet to laminate more than one layers of polymer melts into a first composite melt; k laminated composite generators in serial communication with each other, a first laminated composite generator in serial communication with the outlet of the current collector, each of the laminated composite generators comprises a melt inlet channel, m branch laminated runners and a melt outlet channel, in the vicinity of each of the melt inlet channel m distributary openings are distributed substantially evenly in a width direction to divide the first composite melt into m substantially equal second composite melts, each of the branch laminated runners to enable each equal second composite melt flowing out from each of the distributary openings to rotate approximately 90 degrees, to expand m times as each second composite melt flows forward, and to join together and form a laminated structure melt at the melt outlet channel, the laminated structure melt formed at the melt outlet channel of a last laminated composite generator to have n×mklayers, wherein n and m are integers of no less than 2, and k is an integer of no less than 1; and a forming device connected to the melt outlet channel of the last laminated composite generator in series.

A method for preparing laminated nano-composite material, comprising: feeding materials into n plasticizing-and-feeding device to be processed substantially into uniform fluids, then transported to the current collector by the plasticizing-and-feeding device, and the fluids substantially uniformly join together at the conjunction runners in the current collector and form a multi-layered composite melt with substantially uniform wall thickness. From the outlet of the current collector the composite melt enters k laminated composite generators connected in series, each comprising a melt inlet channel, m branch laminated runners and a melt outlet channel, in the vicinity of each melt inlet channel the composite melt is evenly divided into m equals in the width direction, each equal composite melt rotates approximately 90 degrees and expands for m times as it flows forward in corresponding branch laminated runner, and joins together again and forms a laminated structure melt at the melt outlet channel, the laminated structure melt formed at the melt outlet channel of the last laminated composite generator has n×mklayers, wherein n and m are integers of no less than 2, and k is an integer of no less than 1; the laminated structure melt flowing out from the melt outlet channel of the last laminated composite generator enters the forming device for being processed and shaped into a product.

In the embodiment of the present disclosure, due to the runner characteristic that the melt rotates approximately 90 degrees after being divided and then expands, the branch laminated runners between respective layers are identical to each other, have well interlayer symmetry, the melt may expand from the middle to the outside, and the melt flows substantially uniformly, thereby breaking the limitation of the prior art. Meanwhile, due to the design of rotating the divided melt approximately 90 degrees, the laminated runners can easily keep the symmetrical structures during the flow expanding and thinning process. The design and manufacturing technologies are simple, the accuracy can be easily ensured, and the adaptability to the materials is also greatly improved.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The technical solutions of the embodiments of the present disclosure will be clearly and completely described as follows with reference to the drawings. Obviously, the described embodiments are just a part of the embodiments of the present disclosure rather than all the embodiments thereof. Any embodiment obtained by a person skilled in the art based on the embodiments of the present disclosure without paying any creative effort shall be covered by the protection scope of the present disclosure.

Referring toFIGS. 1-4, the embodiment of the present disclosure provides an apparatus for preparing laminated nano-composite material, comprising a plasticizing-and-feeding device assembly, a current collector2, k laminated composite generators3, and a forming device4. The plasticizing-and-feeding device assembly comprises n plasticizing-and-feeding devices1. The current collector2comprises n inlets and one outlet, wherein each inlet is in communication with one plasticizing-and-feeding device1, and there is a current collector channel between the inlet and the outlet to laminate more than one layers of polymer melts into one layer of composite melt. The k laminated composite generators3are in serial communication with each other, and a first laminated composite generator3is in serial communication with the outlet of the current collector2in series. Each laminated composite generator3comprises a melt inlet channel, m branch laminated runners31and a melt outlet channel. In the vicinity of each melt inlet channel, m distributary openings are distributed substantially evenly in the width direction. Each branch laminated runner enables each equal composite melt flowing out from each distributary opening to rotate approximately 90 degrees and expand for m times as it flows forward, and join together and form a laminated structure melt at the melt outlet channel, as illustrated inFIGS. 2-3. The laminated structure melt formed at the melt outlet channel of the last laminated composite generator3has n×mklayers, wherein n and m are integers of no less than 2, and k is an integer of no less than 1. The forming device4is serially connected to the melt outlet channel of the last laminated composite generator3.

In which, the embodiment arranges the m distributary openings in the vicinity of each melt inlet channel. Herein “in the vicinity of the melt inlet channel” refers to being located on the melt inlet channel or on the outlet channel of a component adjacent to the melt inlet channel, and “the outlet channel of a component adjacent to the melt inlet channel” may specifically refer to the outlet of the current collector2or the melt outlet channel of the previous adjacent laminated composite generator. The m distributary openings are arranged for the purpose of evenly dividing the composite melt into m equals before it enters the branch laminated runner of the laminated composite generator, so that each equal melt enters corresponding branch laminated runner.

That is, “m distributary openings are arranged in the vicinity of each melt inlet channel” for example may be the following cases: each melt inlet channel is provided with the m distributary openings; alternatively, the outlet of the current collector is provided with m distributary openings, and the melt outlet channels of the previous (k−1) laminated composite generators are provided with m distributary openings; and alternatively, the outlet of the current collector is provided with m distributary openings, and the melt inlet channels of the 2ndto kthlaminated composite generators are provided with m distributary openings.

The melt inlet channel of the laminated composite generator3has the same size as the melt outlet channel rotated approximately 90 degrees.

As can be seen from the above embodiment, in case there is one laminated composite generator3, the outlet of the current collector2or the melt inlet channel is provided with m distributary openings, and the composite melt is evenly divided into m equals. Each equal melt enters corresponding branch laminated runner, then it rotates approximately 90 degrees in the branch laminated runner and expands for m times, and joins together and forms a laminated structure melt of n×m layers at the melt outlet channel.

For example, the polymer melts of two compositions join together at the current collector2and then pass through five-equal laminated composite generators, wherein six identical laminated composite generators are in serial communication with each other (i.e., n=2, m=5, k=6), thus a composite laminated structure melt with 2×56=31250 layers in total is finally obtained. The layered melt is extruded from the outlet of the forming device with a thickness of 1 mm, and the average interlayer thickness of the two polymer materials is 32 nm. In case the melt is further tensioned to be 0.1 mm thick, the interlayer thickness of each polymer material of the composite material may reach 3.2 nm. For another example, the polymer melts of two compositions join together and then pass through four-equal laminated composite generator3, wherein eight identical laminated composite generators3are in serial communication with each other, so as to obtain a composite material with 2×48=131072 layers. In case the multi-layer composite material is extruded into the sheets with a thickness of 1 mm, the interlayer thickness of the composite material may reach 7.63 nm. Therefore, nano-composite materials with the interlayer thickness less than 100 nm can be easily prepared using the present apparatus.

In the embodiment of the present disclosure, the following runner characteristic is employed: the melt rotates approximately 90 degrees after being divided, and then expands. Thus the branch laminated runners between respective layers are identical to each other, the interlayer symmetry is good, the melt may expand from the middle to the outside, and the melt flows substantially uniformly, thereby breaking the limitation of ‘one divided into two’ in the prior art, and realizing ‘one divided into three to ten or even more’. For example, ‘one divided into four’ achieves the same layer number just using half of serially connected units employed by ‘one divided into two’, correspondingly, the pressure loss is greatly reduced. Thus ‘one divided into four’ may also be used in the injection molding that requires a high speed filling flow. Meanwhile, due to the design of rotating the divided melt approximately 90 degrees, the laminated runners can easily keep the symmetrical structures during the flow expanding and thinning process. The designing and manufacturing processes are simple, the accuracy can be easily ensured, and the adaptability to the materials is also greatly improved.

Further, in the embodiment of the present disclosure, due to the structure of the laminated composite generator3, the difficulty in processing the current collector2and the forming device4is reduced, and the division and convergence can be completed in the laminated composite generator3. There is only one channel to engage with the interface, thus the sealing is easy to be realized, and it is likely to ensure the melt flow balance between respective branches.

In the embodiment of the present disclosure, the current collector2laminates n layers of melts coming from n plasticizing-and-feeding device1into one layer of composite melt, and the interlayer thicknesses may be the same as or different from each other. The interlayer thicknesses are ensured by the interlayer runner gaps, i.e., respective layers of the final product have the same thickness when the channel gaps are identical to each other during the convergence, and respective layers of the final product have different thicknesses if the channel gaps are not identical to each other during the convergence.

The branch laminated runners of the laminated composite generator3may be processed through a precision casting or an electroplating. Alternatively, the laminated composite generator3may be cut into slices, and each slice undergoes a numerical control machining to obtain the required channel shape, and then assembled into the laminated composite generator3after the slicing processing.

According to an embodiment of the present disclosure, the plasticizing-and-feeding device1may be an extruder, an injection molding device of an injection molding machine or a die casting machine.

A connector11may be connected between each inlet of the current collector2and each plasticizing-and-feeding device1. The runner in the connector11is a rectangular channel which gradually transits from the inlet segment runner in correspondence with the outlet of the plasticizing-and-feeding device1to the outlet segment runner. In case the plasticizing-and-feeding device1is an extruder, the inlet segment runner of the connector11is a cylindrical runner.

The forming device4may be an extruder head, a pressing die or a combination of injection nozzle and die. The forming device illustrated inFIG. 4is a serial combination of injection nozzle and die, and a nozzle41is connected to a die42during the injection molding. The main function of the laminated composite generator3is to evenly divide n layers of polymer melts32extruded from the current collector2into m equals in the width direction, wherein each equal melt rotates approximately 90 degrees and expands for m times as it flows forward in the branch laminated runner31, and joins together and forms a laminated structure melt33of n×m layers at the melt outlet channel. Herein the laminated structure melt joining together at the last laminated composite generator3flows out from the melt outlet channel, then it is injected into the cavity of the die42through the nozzle41, and cooled and shaped to obtain an injection molding product of the polymer laminated composite materials.

The material loaded by the plasticizing-and-feeding device1may be polymer-based, ceramic-based or metal-based composite material.

The embodiment of the present disclosure can be widely employed to prepare various layered nano-composite materials under the molten blending processing. For example in the field of polymer composite material, films, plates and profiles can be directly produced and master batches may also be produced. The embodiment of the present disclosure can also be applied to the field such as ceramic-based or metal-based composite material. The laminated nano-composite generator of the embodiment of the present disclosure may be used in cooperation with an injection molding machine or a die casting machine which has more than two plasticizing-and-feeding devices, so as to directly process the layered composite product.

In the embodiment of the present disclosure, the laminated composite generator3may be a reverse laminator34, and the number thereof is larger than or equal to 1. In m branch laminated runners of the reverse laminator34, at least one branch laminated runner is the reverse branch laminated runner. For example, the branch laminated runner near to the outer side may be a reverse branch laminated runner while others are homodromous branch laminated runners. The rotation directions of the composite melts continually flowing forwards in the reverse branch laminated runners are reverse to those of the composite melts continuing flowing forwards in the homodromous branch laminated runners, and the rotation directions of the composite melts continuing flowing forwards in the homodromous branch laminated runners are the same as each other.

In the embodiment of the present disclosure, referring toFIG. 6, the composite melt is evenly divided into m equals in the width direction when entering the reverse laminator34. Each equal melt rotates in the homodromous branch laminated runner for example approximately 90 degrees clockwise and in the reverse branch laminated runner for example by approximately 90 degrees counterclockwise. During the rotation, the m equals of melts expand for m times, respectively, each equal melt has a thickness of 1/m of the original thickness, and then converges at the melt outlet channel. In the embodiment of the present disclosure, due to the existence of the reverse branch laminated runners, the melt materials on the inner side are transferred to the outer side, and join together and form a laminated structure melt with a total thickness the same as the inlet thickness at the melt outlet channel. The layer sequences of the melts are changed after the convergence.

In the apparatus for preparing laminated nano-composite material according to the embodiment of the present disclosure as illustrated inFIG. 5, there are three plasticizing-and-feeding devices1, which are for example filled with fluid matrix material, adhesive material and barrier material, respectively. The current collector2laminates the three layers of materials (fluid matrix material, adhesive material and barrier material) coming from the three plasticizing-and-feeding device into a composite melt having an ABC structure, as illustrated inFIG. 7. In this embodiment, the matrix material7is represented by A, and usually employs PE; the adhesive material8is represented by B, and usually employs EVA; and the barrier material9is represented by C, and usually employs EVOH.

The composite melt is evenly divided into m equals in the width direction in the vicinity of the melt inlet channel, for example m=2. Each equal melt reversely rotates approximately 90 degrees and expands for 2 times (i.e., the thickness is halved) as it flows forward in the reverse branch laminated runner of the reverse laminator34, so as to form a branch fluid. After the composite melt in the reverse branch laminated runner rotates, in case two layers of composite melts join together, the barrier material9is wrapped therebetween and the matrix material7is at the outermost of the fluid composite layer, as illustrated inFIG. 8, the melts join together and form a fluid of ABCCBA six-layer laminated structure at the melt outlet channel of the reverse laminator, wherein two layers of barrier materials9join together.

In another embodiment of the present disclosure, the laminated composite generator3is a combination of a reverse laminator34and a homodromous laminator35, wherein the reverse laminator34may be connected in front of or behind the homodromous laminator35, as illustrated inFIGS. 5 and 9. The number of the reverse laminator34is larger than or equal to 1. In m branch laminated runners of the reverse laminator34, at least one branch laminated runner is the reverse branch laminated runner, while others are homodromous branch laminated runners. The rotation directions of the composite melts continuing flowing forwards in the reverse branch laminated runners are reverse to those of the composite melts continuing flowing forwards in the homodromous branch laminated runners. The m branch laminated runners in the homodromous laminator35are all homodromous branch laminated runners, and the composite melts therein have the same rotation direction as it flows forward.

For example, the homodromous laminator35may be connected behind the reverse laminator34. For example, the homodromous laminator35evenly divides the fluid joining together by the reverse laminator34into four equals in the width direction. Each equal melt homodromously rotates approximately 90 degrees and expands for four times (i.e., the thickness is quartered) as it flows forward in the homodromous branch laminated runner of the homodromous laminator35, so as to form a branch fluid. The melts join together and form a laminated structure melt of 6×4 layers at the melt outlet channel. Since the laminated material entering the homodromous laminator35has the ABCCBA structure and the A-matrix material is externally located, the matrix materials7directly join together during the convergence of the divided melts, and the adhesive material8and the barrier material9are wrapped in the layers, as illustrated inFIG. 8. As a result, k homodromous laminators35are in serial communication with each other to obtain a fluid of 6×4klayers. The fluid inlet of the forming device4has the same shape as the melt outlet channel of the homodromous laminator35. In the forming device4, the fluid of 6×4klayers gradually transits to the cross-section size required by the die, and finally shaped to obtain the product.

In the embodiment, the polymer fluids of three compositions join together and then pass through two-equal reverse laminator34, and k identical four-equal homodromous laminators35are in serial communication_ with each other, so as to obtain a composite material with 6×4klayers. The layer thickness may reach the level of micrometer or nanometer. Thus the device can be used to prepare micro-nano-composite materials.

In which, the branch laminated runners of the reverse laminator34and the homodromous laminator35may be processed through a precision casting or an electroplating. Alternatively, the reverse laminator34and the homodromous laminator35may be cut into slices, and each slice undergoes a numerical control machining to obtain the required channel shape, and then assembled into the reverse laminator34and the homodromous laminator35.

Other structures, work principles and beneficial effects of the embodiment are the same as those of Embodiment 1, and herein are omitted.

In the embodiment of the present disclosure, the laminated composite generator3adjacently connected to the current collector2is a reverse laminator34having two branch laminated runners31therein, then k reverse laminators34or homodromous laminators35having m branch laminated runners are connected in series.

As can be seen from the example illustrated inFIG. 6, the melts flowing out from the reverse laminator34having two branch laminated runners31have the layer sequence ABCCBA. Regardless of the structure of the reverse laminator34and/or homodromous laminator35to be connected, the layer sequence is a superposition of ABCCBA, i.e., the barrier material and the adhesive material are wrapped in the matrix material, and the outermost layer of the melt is the matrix material. The composite fluids contact the same material when they join together again, and obtain well adhesion. In addition, the composite fluid structure has a good symmetry and the calculation of layer thickness is simple. Further, in case there are n plasticizing-and-feeding device1, the melt coming from the reverse laminator34having two branch laminated runners31has 2n layers, and from the last reverse or homodromous laminator there comes a multi-layer structured composite material with 2n×mklayers.

The apparatus for preparing laminated nano-composite material according to the embodiment of the present disclosure has a high barrier property, and can be widely used to prepare various laminated composite materials, particularly laminated micro-nano-composite material. With respect to the barrier property, the multi-layer structure has a better barrier property under the same total thickness of the barrier material. In addition, the cost of the barrier material is usually high, while a thin barrier layer can meet the requirement on some occasions. However, the traditional method cannot produce any ultra-thin layer product, while the apparatus of the present disclosure can achieve a composite product having the thickness of micrometer or nanometer level. The product types include polymer composite material, in this field, films, plates and profiles can be directly produced, and master batches may also be produced. The apparatus of the present disclosure can also be applied to the fields such as polymer-based, ceramic-based and metal-based composite materials. The barrier layer is wrapped to the inner layer to prevent a waste of extra barrier material adhered to the channel wall of the laminator. The matrix material has good comprehensive properties and located at the outermost layer, so that the composite product has good comprehensive properties such as weather resistance and heat resistance, thereby exerting the optimal properties of various materials.

In the embodiment of the present disclosure, high barrier laminated micro-nano-composite material products of various layer thicknesses can be obtained through different combinations of the reverse laminator34and the homodromous laminator35, and the structures are diversified. Since the modularized structure is employed, it is easy to use the apparatus.

Other structures, work principles and beneficial effects of the embodiment are the same as those of Embodiment 2, and herein are omitted.

Referring toFIG. 9, the apparatus for preparing laminated nano-composite material provided by the embodiment of the present disclosure comprises a plasticizing-and-feeding device1, a connector11, a current collector2, k homodromous laminators35, a reverse laminator34and a forming device4serially connected in sequence, wherein the reverse laminator34is arranged in front of the forming device4, and the plasticizing-and-feeding device1includes three extruders.

The inlet of the current collector2is in communication with the outlet of the connector11, and the channel in the connector11is a rectangular channel that gradually transits from the cylindrical channel of the inlet segment to the outlet segment. The current collector2laminates three fluids (matrix material7, adhesive material8and barrier material9) coming from the three extruders of the plasticizing-and-feeding device1into a composite fluid with the ABCB structure, wherein the adhesive material8occupies two layers. For the convenience of understanding, the matrix material7is represented by symbol A, and usually employs PE; the adhesive material8is represented by B, and usually employs EVA; and the barrier material9is represented by C, and usually employs EVOH.

The four-layered polymer fluid ABCB is evenly divided into three equals in the width direction in the vicinity of the melt inlet channel of the first homodromous laminators35. Each equal melt homodromously rotates approximately 90 degrees and expands for 3 times (i.e., the thickness is trisected) as it flows forward in the branch laminated runner of the homodromous laminator35, so as to form a branch fluid. The melts join together and form a fluid of 4×3-layer laminated structure at the melt outlet channel, as illustrated inFIG. 10. A fluid of 4×3klayers is obtained when the fluid of the laminated structure leaves the kthhomodromous laminator35.

The fluid of 4×3klayers enters the reverse laminator34, and it is evenly divided into three equals in the width direction in the vicinity of the melt inlet channel of the reverse laminator34. Each equal melt reversely rotates approximately 90 degrees and expands for 3 times (i.e., the thickness is trisected) as it flows forward in the branch laminated runner of the reverse laminator34, so as to form a branch fluid. After the reverse rotation, during the fluid convergence, the barrier material9is wrapped between the fluids and becomes one layer, and the matrix material7is located at the outermost of the fluid composite layer, as illustrated inFIG. 11, the melts join together at the melt outlet channel of the reverse laminator34, and form a fluid of ABCB . . . ABCBABCB . . . ABCBBCBA . . . BCBA laminated structure having 4×3k×3 layers, wherein the arrangement of the previous 4×3k×2 layers of the composite fluid is ABCB . . . ABCBABCB . . . ABCB, and the arrangement of the remained 4×3k×1 layers is BCBA . . . BCBA, and finally the two equals are combined. The outermost layer of the composite fluid is still the matrix material7, and the adhesive material8separates the matrix material7and the barrier material9.

Other structures, work principles and beneficial effects of the embodiment are the same as those of Embodiment2, and herein are omitted.

The embodiment of the present disclosure provides a method for preparing laminated nano-composite material, comprising:

materials are fed into n plasticizing-and-feeding device1and become substantially uniform fluids under the action of the plasticizing-and-feeding device1, then transported to the current collector2by the plasticizing-and-feeding device1, and the fluids substantially uniformly join together and form a multi-layered composite melt with substantially uniform wall thickness at the conjunction runners in the current collector2;

From the outlet of the current collector2the composite melt enters k laminated composite generators3in serial communication with each other, each comprising a melt inlet channel, m branch laminated runners31and a melt outlet channel. In the vicinity of each melt inlet channel the composite melt is evenly divided into m equals in the width direction. Each equal composite melt rotates by approximately 90 degrees and expands for m times as it flows forward in corresponding branch laminated runner, and joins together again and forms a laminated structure melt at the melt outlet channel. The laminated structure melt formed at the melt outlet channel of the last laminated composite generator3has n×mklayers, wherein n and m are integers of no less than 2, and k is an integer of no less than 1;

The laminated structure melt flowing out from the melt outlet channel of the last laminated composite generator3enters the forming device4for being processed and shaped into a product.

Other structures, work principles and beneficial effects of the embodiment are the same as those of Embodiment 1, and herein are omitted.

The above descriptions are just several embodiments of the present disclosure, and based on the disclosure of the present disclosure, a person skilled in the art can make various changes or modifications to the embodiments of the present disclosure, without deviating from the spirit and scope of the present disclosure.