CN118269443B - A polymer sheet and continuous production method thereof - Google Patents

A polymer sheet and continuous production method thereof Download PDF

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Publication number
CN118269443B
CN118269443B CN202410582073.XA CN202410582073A CN118269443B CN 118269443 B CN118269443 B CN 118269443B CN 202410582073 A CN202410582073 A CN 202410582073A CN 118269443 B CN118269443 B CN 118269443B
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China
Prior art keywords
layer
polypropylene film
film
biaxially oriented
preheating
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CN118269443A (en
Inventor
史先锋
张磊
张彬
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Changzhou Carbon Front Composite Material Technology Co ltd
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Changzhou Carbon Front Composite Material Technology Co ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/026—Knitted fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)

Abstract

本发明公开了一种聚合物板材及其连续化生产方法，聚合物板材包括复合芯层，复合芯层包括多层未拉伸聚丙烯薄膜，相邻未拉伸聚丙烯薄膜之间层设双向拉伸聚丙烯薄膜，构成交替叠层结构；还可以层设织物层来改善聚丙烯极差的缺口冲击性能；未拉伸聚丙烯薄膜表面粗糙或是开设有内凹气道；引入水平顺序排布的放卷辊组进行自动放卷，结合预热、点焊、连续辊压设备，实现聚合物板材的连续化生产，大幅提升了生产效率；还能够在成型过程中有效实现排气，并通过未拉伸聚丙烯薄膜、双向拉伸聚丙烯薄膜的厚度设定，结合温度控制，有效保证了复合芯层内层间的粘结效果，极大地利于批量生产，利于应用扩展。

The invention discloses a polymer sheet and a continuous production method thereof. The polymer sheet comprises a composite core layer, the composite core layer comprises multiple layers of unstretched polypropylene films, and biaxially stretched polypropylene films are arranged between adjacent unstretched polypropylene films to form an alternating laminated structure; a fabric layer can also be arranged to improve the extremely poor notched impact performance of polypropylene; the surface of the unstretched polypropylene film is rough or an inner concave air channel is opened; a horizontally sequentially arranged unwinding roller group is introduced for automatic unwinding, combined with preheating, spot welding, and continuous rolling equipment, to achieve continuous production of the polymer sheet, greatly improving production efficiency; and effective exhaust can be achieved during the molding process, and the bonding effect between the inner layers of the composite core layer is effectively guaranteed by setting the thickness of the unstretched polypropylene film and the biaxially stretched polypropylene film and combining temperature control, which is greatly beneficial to batch production and application expansion.

Description

Polymer board and continuous production method thereof
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a polymer plate and a continuous production method thereof.
Background
The PP self-reinforcing material greatly improves the excellent performances of the conventional PP, such as strength, rigidity and the like by blending and modifying the PP, generally, PP resin is firstly melted to prepare a film, extruded and drawn into fibers, the fibers are woven into fiber fabrics, and then the film and the fiber fabrics are laminated and hot-pressed to form the PP self-reinforcing plate.
In the prior art, a flat plate tablet press is generally adopted for carrying out repeated hot pressing layer by layer to realize a composite and re-composite multilayer structure form, which is an intermittent production mode, has multiple and complex procedures, high equipment investment, high maintenance cost and larger labor cost occupation ratio.
The adoption of the tablet press flat plate hot-press forming mode is not beneficial to the exhaust of products, air can remain during lamination between films, the air is difficult to exhaust during hot pressing, especially the films can be mutually bonded after being heated, the path of air which is transversely discharged outwards is cut off, and the thicker the product is, the larger the length and width dimensions are, the more serious the physical air bubble condition exists in the product after hot pressing.
In the repeated hot pressing process, the production is discontinuous, the temperature needs to be repeatedly increased and decreased, the time is quite long, and the internal layering phenomenon can occur after the forming, so that the use is affected.
Therefore, for the existing PP self-reinforcing material, the current forming mode is not beneficial to large-scale mass production, and the popularization and application of the PP self-reinforcing material in various fields are limited.
Disclosure of Invention
In order to solve the problems, the invention provides the polymer plate with reasonable structure and the continuous production method thereof, thereby realizing continuous production of the polymer plate, greatly improving the production efficiency, effectively ensuring the bonding effect between the layers in the composite core layer, greatly facilitating batch production and being beneficial to application expansion.
The technical scheme adopted by the invention is as follows:
The polymer plate comprises a composite core layer, a fabric layer and a concave air passage, wherein the composite core layer comprises a plurality of layers of unstretched polypropylene films, a bidirectional stretching polypropylene film is arranged between adjacent unstretched polypropylene films to form an alternating laminated structure, and the surface of the unstretched polypropylene film is rough or provided with the concave air passage.
As a further improvement of the above technical scheme:
The non-stretched polypropylene film and the biaxially oriented polypropylene film are both in a single-layer structure, the non-stretched polypropylene film adopts random copolymer polypropylene, the biaxially oriented polypropylene film adopts isotactic polypropylene, and the melting point of the non-stretched polypropylene film is lower than that of the biaxially oriented polypropylene film.
And (3) casting and forming an unstretched polypropylene film by using a casting machine, wherein the thickness of the unstretched polypropylene film is 0.01-0.02mm, and extruding and forming a biaxially oriented polypropylene film by using an extruder, and the thickness of the biaxially oriented polypropylene film is 0.02-0.03mm.
The melting point of the unstretched polypropylene film is 155-160 ℃, the molecular weight is 6-8 ten thousand, the melt flow rate is 5-8g/10min, the isotacticity of the biaxially oriented polypropylene film is 95-99%, the melting point is 168-172 ℃, the molecular weight is 8-10 ten thousand, and the melt flow rate is 1-4g/10min.
The inner concave air passage is communicated along the length direction of the unstretched polypropylene film.
At least one layer of fabric layer is arranged in the composite core layer, polypropylene films are attached to two sides of the fabric layer, the fabric layer is one of polypropylene fiber fabric, polypropylene coated polyester fiber fabric and polypropylene coated nylon fiber fabric, the fabric layer adopts a plain weave or twill weave structure, the fiber structure of the fabric layer is round yarn, the specification is 500-2000D, and the draft multiplying power is 6-8 times.
The composite core layer is of a laminated structure with more than 30 layers, one side of the composite core layer is sequentially provided with a bonding layer and an outer layer I, the other side of the composite core layer is provided with an outer layer II, the outer layer I is a biaxially oriented polyester film or a biaxially oriented nylon film, and the outer layer II is polyester knitted cloth.
A continuous production method of a polymer plate comprises the following steps of automatic unreeling, prepressing, spot welding, preheating, rolling and cutting;
In the automatic unreeling procedure, each layer of rolled film is sequentially placed on each unreeling roller according to the upper and lower layering sequence of the plate, the upper unreeling roller and the lower unreeling roller are symmetrically distributed to form a group of unreeling roller groups, and a plurality of groups of unreeling roller groups are horizontally and orderly arranged along the production direction;
The number of the composite core layers in the plate is more than 30;
the prepressing is performed by using prepressing laminating rollers which are arranged vertically symmetrically, and exhaust is performed between layers through a concave air passage during prepressing lamination.
As a further improvement of the above technical scheme:
The structure of the single unreeling roller set comprises reels which are symmetrically arranged up and down and are used for placing coiled materials, and the coil leading-out ends are respectively provided with an electrostatic roller brush;
the number of unreeling roller sets is determined by the number of layers constituting the board.
In the spot welding process, spot welding equipment is used for forming welding spots at intervals on two edges of the pre-pressed plate lamination in the length direction, and the distance between the welding spots and the edges is 3-5mm.
The front and back are provided with two preheating procedures, including preheating by a first preheating drying channel connected to the rear end of the unreeling roller set, and preheating by a second preheating drying channel after spot welding;
The rolling adopts continuous rolling equipment which comprises an upper group of steel belts and a lower group of steel belts linearly attached along the length direction, and four sections of temperature control and heat control sections are arranged along the length direction of the continuous rolling equipment, wherein the four sections of temperature control and heat control sections comprise a pre-heating pre-pressing section, a heating pressurizing section, a heat preservation pressure maintaining section and a cooling pressure maintaining section in sequence, the heat preservation pressure maintaining section reaches the highest temperature, and the temperature is controlled to be 168+/-1 ℃.
The temperature of the preheating pre-pressing section is controlled to be 120-150 ℃, the pressure is 0.5-1Mpa, the temperature of the heating and pressurizing section is 150-168 ℃, the pressure is 1-2Mpa, the temperature of the heat preservation and pressure maintaining section is 168+/-1 ℃, the pressure is 1-2Mpa, the temperature of the cooling and pressure maintaining section is 60-90 ℃, the pressure is 1-2Mpa, and the total duration of the laminated film flowing through the four sections is 3-15min.
Compared with the prior art, the invention has the following beneficial effects:
The invention has compact and reasonable structure, is formed by alternately laminating the unstretched polypropylene films and the biaxially oriented polypropylene films, has rough surface or is provided with a concave air passage through the surface arrangement of the unstretched polypropylene films, and can be further provided with a fabric layer to improve the poor notch impact property of polypropylene;
the invention also has the following advantages:
The automatic unreeling of coiled materials is realized by introducing unreeling roller groups which are horizontally arranged in sequence, the space layout is convenient, the quantity of the unreeling roller groups put into production can be quickly adjusted according to the change of the layer number of the plates, the replacement, the switching and the standby are convenient, the unreeling tension can be independently controlled, and the adjustment and the homogenization of the unreeling tension are convenient to ensure;
The thickness of the unstretched polypropylene film and the biaxially oriented polypropylene film are set to be of a single-layer structure, and the bonding effect between the layers in the composite core layer is effectively ensured by combining temperature control, so that the existing delamination phenomenon is effectively solved;
the unique eyelet structure of the fabric cloth also provides a better gas exhaust channel, so that the exhaust capacity is further improved, and the exhaust is facilitated.
Drawings
FIG. 1 is a schematic structural view of a polymer sheet according to the present invention.
FIG. 2 is a schematic view of the structure of the concave air passage on the unstretched polypropylene film of the present invention.
FIG. 3 is a schematic illustration of another configuration of the recessed air channels on an unstretched polypropylene film of the invention.
FIG. 4 is a schematic view of a continuous production facility.
Fig. 5 is a schematic structural view of the unreeling roller set of the present invention.
FIG. 6 is a schematic layout of the solder joints on the board of the present invention.
Wherein, 1, the first outer layer is provided; 2, an adhesive layer, 3, a functional layer, 4, a composite core layer, 5, an outer layer II;
4a, an unstretched polypropylene film, 4b, a biaxially oriented polypropylene film, 4c, a fabric layer, 4a1 and a concave air passage;
10. An unreeling roller set; 20 parts of preheating drying tunnel I, 30 parts of prepressing laminating roller, 40 parts of spot welding equipment, 50 parts of preheating drying tunnel II, 60 parts of rubber roller group, 70 parts of continuous rolling equipment, 80 parts of cutting machine, and 90 parts of plate;
11. Tensioning traction device 12, static roller brush 13, coiled material;
91. and welding spots.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in FIG. 1, the polymer board in this embodiment comprises a composite core layer 4, wherein the composite core layer 4 comprises a plurality of layers of non-stretched polypropylene films 4a, and a bi-directional stretched polypropylene film 4b is arranged between adjacent non-stretched polypropylene films 4a to form an alternate laminated structure, and further comprises a fabric layer 4c, wherein the surface of the non-stretched polypropylene film 4a is rough or provided with a concave air passage 4a1.
In this embodiment, the composite core layer 4 is formed by alternately laminating the unstretched polypropylene film 4a and the biaxially oriented polypropylene film 4b, and the surface of the unstretched polypropylene film 4a is rough or provided with the concave air channel 4a1, so that the method is convenient for continuous production, especially continuous rolling, and can effectively realize air exhaust, reduce or even avoid the formation of bubbles, and effectively ensure the molding quality in continuous production.
In one embodiment, the unstretched polypropylene film 4a and the biaxially oriented polypropylene film 4b are both of a single-layer structure, wherein the unstretched polypropylene film 4a is made of random copolymer polypropylene, the biaxially oriented polypropylene film 4b is made of isotactic polypropylene, and the melting point of the unstretched polypropylene film 4a is lower than that of the biaxially oriented polypropylene film 4 b.
In this embodiment, by setting the thickness of the unstretched polypropylene film 4a and the biaxially oriented polypropylene film 4b, both of them have a single-layer structure, and by combining with temperature control, the bonding effect between the inner layers of the composite core layer 4 is effectively ensured, and the existing delamination phenomenon is effectively solved.
Under the preset control temperature, the unstretched polypropylene film 4a is completely melted, and the biaxially oriented polypropylene film 4b is in a surface micro-melting state, so that the interlayer adhesion of the biaxially oriented polypropylene film can be effectively ensured, the overlapping effect of multiple layers is still shown after bonding molding, and the excellent performance of the composite core layer 4 is ensured.
The non-stretched polypropylene film 4a is cast by a casting machine, the thickness of the non-stretched polypropylene film 4a is 0.01-0.02mm, the tensile strength is more than 25Mpa transversely and 35Mpa longitudinally, and the haze is less than 5%.
The biaxially oriented polypropylene film 4b is extruded by an extruder, the thickness of the biaxially oriented polypropylene film 4b is 0.02-0.03mm, the tensile strength is transverse to 120Mpa, the tensile strength is longitudinal to 200Mpa, the elongation at break is transverse to 200%, the longitudinal direction is 80%, the haze is 4%, and the thermal shrinkage is 5%.
In this embodiment, by setting the thickness of the unstretched polypropylene film 4a and the biaxially oriented polypropylene film 4b, the difference of the melting points of the two films can be combined, so that the two films can be mutually bonded when the lamination is heated, the lamination state can be still maintained, the lamination forming effect is ensured, and the tensile strength of the whole plate after the lamination forming of the two films is effectively assisted.
The haze is set to ensure the gloss of the film and then the gloss of the laminated plate, and the heat shrinkage is set to reduce the occurrence of film wrinkling.
The melting point of the unstretched polypropylene film 4a is 155-160 ℃, the molecular weight is 6-8 ten thousand, the melt flow rate is 5-8g/10min, the isotacticity of the biaxially oriented polypropylene film 4b is 95-99%, the melting point is 168-172 ℃, the molecular weight is 8-10 ten thousand, and the melt flow rate is 1-4g/10min.
By setting the molecular weight, the viscosity and the fluidity of the two films in the respective molten states are effectively ensured, the films can be formed smoothly respectively, and the forming performance of the film is ensured, especially the adhesion between the unstretched polypropylene film 4a and the biaxially oriented polypropylene film 4b in the completely molten state.
The isotacticity of the biaxially oriented polypropylene film 4b is set to be more than 95%, so that the melting point of the biaxially oriented polypropylene film is effectively ensured, and if the isotacticity is lower than 95%, the melting point is greatly reduced.
In practical production, the temperature can be controlled between the melting point of the unstretched polypropylene film 4a and the melting point of the biaxially oriented polypropylene film 4b, for example, the temperature is set between 160 ℃ and 168 ℃, preferably around 168 ℃, so that the unstretched polypropylene film 4a is completely melted, and the biaxially oriented polypropylene film 4b is in a surface micro-melted state, thereby effectively ensuring the mutual bonding effect.
In this embodiment, biaxially oriented polypropylene film 4b is an isotactic polypropylene, which has a high melting point of 168-172 ℃, an isotacticity of 95-99%, a molecular weight of 8-10 ten thousand, a melt flow rate of 1-4g/10min, and a tensile strength of >25Mpa, preferably, but not limited to, the EP3T56F series.
In this example, the non-stretched polypropylene film 4a is a random copolymer polypropylene, which is a low-melting polypropylene having a melting point of 155-160℃and a molecular weight of 6-8 ten thousand, a melt flow rate of 5-8g/10min, and a tensile strength of >20MPa, preferably, but not limited to, the brand RP 370M.
The inner concave air passage 4a1 is penetrated along the length direction of the non-stretched polypropylene film 4a, and the inner concave air passage 4a1 can be arranged on one side or both sides of the non-stretched polypropylene film 4a according to practical conditions, such as the thickness of the non-stretched polypropylene film 4a, the exhaust requirement and the like.
In the embodiment shown in fig. 2, a plurality of straight-line-shaped concave air passages 4a1 may be formed on the surface of the unstretched polypropylene film 4a along the length direction, and in the rolling process, the interlayer air may be discharged outwards along the concave air passages 4a 1.
In the embodiment shown in fig. 3, a plurality of fold line-shaped concave air passages 4a1 may be formed on the surface of the unstretched polypropylene film 4a along the length direction, so that the air between layers is not affected in the rolling process and is discharged outwards along the concave air passages 4a1, and the structural strength of the unstretched polypropylene film 4a can be ensured.
The concave air channel 4a1 in this embodiment may be formed by casting an unstretched polypropylene film 4a, where the thickness of the concave air channel 4a1 is in the μm level, and may be set according to the thickness and performance of the actual film, for example, 1/5-1/3 of the thickness of the film, so that the air can be exhausted easily, and the concave air channel 4a1 will be filled and vanished due to the heated and melted unstretched polypropylene film 4a during lamination.
In another embodiment, a certain roughness can be set on the surface of the unstretched polypropylene film 4a, and the interlayer air is discharged during rolling through a communication air passage formed after the roughness setting.
At least one fabric layer 4c is arranged in the composite core layer 4, the polypropylene films 4a are attached to two sides of the fabric layer 4c, the fabric layer 4c is one of polypropylene fiber fabric, polypropylene-coated polyester fiber fabric and polypropylene-coated nylon fiber fabric, preferably polypropylene fiber fabric, the interfacial bonding force is better, the fabric layer 4c adopts a plain weave or twill weave structure, the fiber structure of the fabric layer 4c is round yarn with the specification of 500-2000D, the drafting ratio is 6-8 times, and the fabric cloth has bird-eye structure air holes which are beneficial to exhaust.
In this embodiment, the unique warp and weft knitting structure of the fabric layer 4c can greatly improve the poor notch impact strength of polypropylene, and can provide a better air hole discharge channel, which is beneficial to exhaust.
A fabric layer 4c is arranged between at least one group of adjacent unstretched polypropylene films 4a and biaxially oriented polypropylene films 4b in the composite core layer 4, and the notch impact performance of the plate is improved by arranging the fabric layer 4c in the composite core layer 4.
In this embodiment, the fabric layer 4c may be layered in the central position of the composite core layer 4, or the fabric layer 4c may be layered in the ordered spacer layer in the composite core layer 4, and the specific number of layers may be determined according to the notch performance requirement of the plate 90.
The composite core layer 4 is of a laminated structure with more than 30 layers, one side of the composite core layer 4 is sequentially provided with a bonding layer 2 and an outer layer 1, the other side of the composite core layer 4 is provided with an outer layer two 5, the outer layer one 1 is a biaxially oriented polyester film or a biaxially oriented nylon film and has the effects of oil resistance, separation, friction resistance and impact resistance, the outer layer two 5 is a polyester knitted fabric which is used as special requirements, is soft and elastic, has the effects of buffering and protecting, can improve notch impact strength and has a certain effect on exhaust.
In this embodiment, the adhesive layer 2 may be an ethylene-vinyl acetate copolymer, which has an adhesive effect, and bonds the outer layer 1 and the composite core layer 4.
In this embodiment, the functional layer 3 may be stacked on the surface of the composite core layer 4, and used as a special requirement, for example, a film layer with a different color, an antibacterial film layer, a flame retardant film layer, and the like.
The continuous production method of the polymer plate comprises the following steps of automatic unreeling, prepressing, spot welding, preheating, rolling and cutting.
As shown in FIG. 4, the front-rear connection equipment for continuous production of the polymer sheet comprises an unreeling roller set 10, a first preheating drying tunnel 20, a pre-pressing laminating roller 30, a spot welding device 40, a second preheating drying tunnel 50, a rubber roller set 60, a continuous rolling device 70 and a cutting machine 80.
As shown in fig. 5, in the automatic unreeling process, each layer of rolled film is sequentially placed on each unreeling roller according to the upper and lower layer sequence of the plate 90, the upper and lower unreeling rollers are symmetrically arranged to form a group of unreeling roller groups 10, a plurality of groups of unreeling roller groups 10 are horizontally and orderly arranged along the production direction, the rolled film on the unreeling roller group 10 positioned at the forefront end in the production direction forms the outermost layers on the upper and lower side surfaces of the plate 90, the rolled film on the unreeling roller group 10 adjacent at the rear forms the secondary outer layer, and the rolled film on the unreeling roller group 10 positioned at the rear end in the production direction forms the middle layer of the plate 90.
In actual production, the two films unreeled and led out on the unreeled roller set 10 of the rear group are respectively attached to the inner sides of the two films unreeled and led out by the unreeled roller set 10 of the front group and attached, and the two films unreeled and led out on the unreeled roller set 10 farthest from the preheating drying tunnel one 20 are positioned at the most central position of the laminated plate 90.
As shown in fig. 5, after the films are unwound by the plurality of groups of unwinding roller groups 10, the plates 90 are sequentially arranged from 1- > i- > N in a counterclockwise direction to form the plates 90 with an N-layer laminated structure, when the plates 90 with 30 layers are stacked, namely, when the N is 30, 15 groups of unwinding roller groups 10 are compactly arranged to unwind 30 layers of films, in the front-most group of unwinding roller groups 10 close to the first preheating drying tunnel 20, the film unwound by the upper one of the unwinding roller groups forms the upper 1 st layer of the plates 90, and the film unwound by the lower one of the unwinding roller groups forms the lower last 30 th layer of the plates 90, wherein the films unwound by the upper unwinding roller groups 10 of each group are sequentially 1 st layer, 2 nd layer, 3 rd layer, 17 th layer and 15 th layer, and the films unwound by the lower unwinding roller groups 10 of each group are sequentially 16 th layer, 17 th layer and 30 th layer.
The number of composite core layers 4 in the plate 90 is more than 30, and the number of unreeling roller sets 10 put into production corresponds to the number of layers of the plate 90.
The prepressing adopts prepressing laminating rollers 30 which are arranged vertically symmetrically, and exhaust air backwards from the interlayer through the concave air passage 4a1 during prepressing lamination.
In actual production, the distance between rollers and the roller speed in the pre-pressing laminating roller 30 are dynamically adjustable, and the distance and the roller speed can be adjusted according to different thicknesses of products, so that when the products are pre-laminated, the effect of exhausting can be achieved, and the occurrence of wrinkles due to overpressure can be avoided. The pre-pressing laminating rollers 30 can be set with adjustable spacing of 0-80mm and adjustable roller speed of 0-30 r/min.
In this embodiment, the unreeling roller sets 10 which are horizontally and sequentially arranged are introduced to realize automatic unreeling of coiled materials, so that the unreeling roller sets 10 which are put into production can be rapidly adjusted according to the layer number change of the plates 90, the unreeling roller sets are convenient to install, replace, switch and reserve, can be independently controlled, the adjustment and homogenization of unreeling tension can be conveniently ensured, and the horizontally arranged production mode is particularly suitable for automatic unreeling of large-diameter coiled materials, and effectively assists in realizing continuous production of the plates 90.
The single unreeling roller set 10 has the structure that the single unreeling roller set 10 comprises reels which are symmetrically distributed up and down and are used for placing coiled materials 13, electrostatic roller brushes 12 are respectively arranged at the leading-out ends of the coiled materials 13, the upper coiled materials 13 and the lower coiled materials 13 are oppositely and forwards attached and led out, a tensioning traction device 11 is arranged at the attaching position, a film is pulled backwards by the tensioning traction device 11, and the tension of the tensioning traction device 11 is set to be 20-80N.
The number of unwind roller sets 10 used is determined by the number of layers that make up sheet 90.
In this embodiment, the electrostatic roller brush 12 may be an ion wind rod or an ion wind curtain, and is usually used together with a high-voltage generator, and the static eliminating time is 1-5s, and the effect of removing static is achieved by uniformly blowing out strong ion wind, so as to eliminate static adsorption of impurities, foreign matters and dust on the surface of the film, reduce the dirt probability, and simultaneously reduce the adsorption force between the films, thereby being beneficial to the discharge of air.
In the spot welding process, the spot welding device 40 is used for forming welding spots 91 by spacing the points on the two edges of the pre-pressed plate lamination in the length direction, as shown in fig. 6, the distance between the welding spots 91 and the edges is 3-5mm, and the lamination positioning of the multilayer films is realized by arranging the welding spots 91, so that slippage among the film layers in the subsequent process is prevented.
In this embodiment, an ultrasonic spot welding apparatus may be used, and high frequency ultrasonic energy is used to generate mechanical vibrations within the polymer, heat is generated at the joint, and the material is melted and cooled to form the weld 91. The ultrasonic spot welding equipment generally has an automatic positioning function and an automatic deviation correcting function, a programmable intermittent spot welding function, high spot welding precision and high spot welding efficiency, and can greatly improve the deviation and slippage problems in the production process, the welding time is preferably 0.5-1s, the welding time interval is preferably 5-20s, and welding spots 91 are formed at positions 3-5mm away from the edges of the left and right sides of the plate 90.
In actual production, the energy of the spot welding device 40 is regulated to be 0-2000J, the more the layers of the plate material 90 are, the higher the energy is, the working amplitude is between 10% and 100%, and the larger the layers of the plate material 90 are, the larger the amplitude is.
The front and back are provided with two preheating procedures, including preheating by a first preheating drying channel 20 connected to the rear end of the unreeling roller set 10, and preheating by a second preheating drying channel 50 after spot welding;
The continuous rolling equipment 70 is adopted in rolling, the continuous rolling equipment 70 can be double-steel-belt continuous rolling equipment, the continuous rolling equipment 70 comprises an upper steel belt group and a lower steel belt group which are linearly attached along the length direction, and four sections of temperature control and heat control sections are arranged along the length direction of the continuous rolling equipment 70, and sequentially comprise a preheating pre-pressing section, a heating and pressurizing section, a heat preservation and pressure maintaining section and a cooling and pressure maintaining section, wherein the heat preservation and pressure maintaining section reaches the highest temperature and is controlled to be 168+/-1 ℃.
In this embodiment, the continuous rolling apparatus may perform differential process selection for different products by controlling the temperature and pressure of each section through a program.
In actual production, the temperature of the preheating pre-pressing section is preferably controlled to be 120-150 ℃, the pressure is 0.5-1Mpa, the temperature of the heating and pressurizing section is preferably controlled to be 150-168 ℃, the pressure is preferably controlled to be 1-2Mpa, the temperature of the heat preservation and pressure maintaining section is preferably 168+/-1 ℃, the pressure is preferably controlled to be 1-2Mpa, the temperature of the cooling and pressure maintaining section is preferably controlled to be 60-90 ℃, the pressure is preferably controlled to be 1-2Mpa, and the total duration of the laminated film flowing through the four sections is preferably 3-15min.
In the embodiment, the laminated film material reaches a surface softening state in the preheating and prepressing section by controlling the respective temperature and pressure in the preheating and prepressing section, the heating and pressurizing section, the heat-preserving and pressurizing section and the cooling and pressurizing section, the pressurizing in the state is beneficial to exhausting interlayer gas, the non-stretched polypropylene film is fused in the heating and pressurizing section, the biaxially-stretched polypropylene film is not fused in the state, the air flow channel on the surface of the non-stretched polypropylene film disappears, the surface of the biaxially-stretched polypropylene film is micro-fused in the heat-preserving and pressurizing section and is mixed with the completely fused non-stretched polypropylene, and the melted molecular chains on the surface of the biaxially-stretched polypropylene in the cooling and pressurizing section are cooled and crystallized together with the melted molecular chains of the non-stretched polypropylene, so that the molecular chains are mutually wound to form a firm whole.
The temperature of the heating roller is controlled to be 168+/-1 ℃, the performance of the product is controlled, the product stability is improved and ensured, the surface of the biaxially oriented polypropylene film 4b is in a micro-melting state at the temperature, the biaxially oriented polypropylene film is unchanged in structure, the mechanical property is not affected, the unstretched polypropylene film 4a is completely melted, and the cooling temperature is 60-90 ℃ after being cooled by the cooling section, so that the biaxially oriented polypropylene film can be firmly combined into a whole.
At the front end of the continuous production, the continuous sheet material 90 may be cut into a predetermined size by performing operations such as flash cutting, automatic winding, and fixed-point cutting by the cutter 80.
Example 1:
A continuous production method of a polymer plate comprises the following steps:
a. 15 rolls of biaxially oriented polypropylene film 4b, 17 rolls of unstretched polypropylene film 4a, 1 roll of polypropylene fabric cloth (fabric layer 4 c), 1 roll of biaxially oriented polyester film (outer layer one 1), 1 roll of ethylene-vinyl acetate copolymer (adhesive layer 2), and 1 roll of polyester knitted fabric (outer layer two 5) are sequentially placed on each unreeling roller according to the layering sequence, each roll of film is sequentially stacked for layering after being pulled by an electrostatic removing device and a tension roller, and the tension roller is set to be 30N.
B. Preheating the material in an oven, then, feeding the material onto a pre-pressing laminating roller 30, and discharging air between layers through the pre-pressing laminating roller 30.
C. Through automatic ultrasonic spot welding equipment, the spot welding time is 0.5s and the interval is 10s through intermittent automatic welding.
D. After passing through a preheating drying tunnel II 50 and a rubber roller, the continuous rolling equipment of the double steel belts is provided with a preheating pre-pressing section with the temperature of 130 ℃ and the pressure of 0.5Mpa, a heating and pressurizing section with the temperature of 160 ℃ and the pressure of 1Mpa, a heat preservation and pressure maintaining section with the temperature of 168+/-1 ℃ and the pressure of 1.5Mpa, a cooling and pressure maintaining section with the temperature of 60 ℃ and the pressure of 1.5Mpa, and the total duration of flowing through the four sections is 5min.
E. and cutting the bonded product into specific sizes by an automatic cutting machine.
Example 2:
A continuous production method of a polymer plate comprises the following steps:
a. 30 rolls of biaxially oriented polypropylene film 4b, 32 rolls of unstretched polypropylene film 4a, 1 roll of polypropylene fabric cloth (fabric layer 4 c), 1 roll of biaxially oriented polyester film (outer layer one 1), 1 roll of ethylene-vinyl acetate copolymer (adhesive layer 2) and 1 roll of polyester knitted fabric (outer layer two 5) are orderly placed on an unreeling roller according to the layering sequence, and each roll of film is orderly stacked to be layered after being pulled by an electrostatic removing device and a tension roller.
B. Preheating the material in an oven, then, feeding the material onto a pre-pressing laminating roller 30, and discharging air between layers through the pre-pressing laminating roller 30.
C. Through automatic ultrasonic spot welding equipment, the spot welding time is 0.8s and the interval is 10s through gap type automatic welding.
D. After passing through a preheating drying tunnel II 50 and a rubber roller, the continuous rolling equipment of the double steel belts is provided with a preheating pre-pressing section with the temperature of 130 ℃ and the pressure of 0.5Mpa, a heating and pressurizing section with the temperature of 160 ℃ and the pressure of 1Mpa, a heat preservation and pressure maintaining section with the temperature of 168+/-1 ℃ and the pressure of 1.5Mpa, a cooling and pressure maintaining section with the temperature of 60 ℃ and the pressure of 1.5Mpa, and the total duration of flowing through the four sections is 8min.
E. and cutting the bonded product into specific sizes by an automatic cutting machine.
Example 3:
a. 45 rolls of biaxially oriented polypropylene film 4b, 47 rolls of non-oriented polypropylene film 4a, 1 roll of polypropylene fabric cloth (fabric layer 4 c), 1 roll of biaxially oriented polyester film (outer layer one 1), 1 roll of ethylene-vinyl acetate copolymer (adhesive layer 2) and 1 roll of polyester knitted cloth (outer layer two 5) are orderly placed on an unreeling roller according to the layering sequence, and each roll of film is orderly stacked to be layered after being pulled by an electrostatic removing device and a tension roller.
B. Preheating the material in an oven, then, feeding the material onto a pre-pressing laminating roller 30, and discharging air between layers through the pre-pressing laminating roller 30.
C. through automatic ultrasonic spot welding equipment, the spot welding time is 1s and the interval is 10s through intermittent automatic welding.
D. After passing through a preheating drying tunnel II 50 and a rubber roller, the continuous rolling equipment of the double steel belts is provided with a preheating pre-pressing section with the temperature of 130 ℃ and the pressure of 0.5Mpa, a heating and pressurizing section with the temperature of 160 ℃ and the pressure of 1Mpa, a heat preservation and pressure maintaining section with the temperature of 168+/-1 ℃ and the pressure of 1.5Mpa, a cooling and pressure maintaining section with the temperature of 60 ℃ and the pressure of 1.5Mpa, and the total duration of flowing through the four sections is 10min.
E. and cutting the bonded product into specific sizes by an automatic cutting machine.
Comparative example 1:
Unlike example 1, the main body of the composite core layer 4 (namely, 15 rolls of biaxially oriented polypropylene film 4b, 17 rolls of non-oriented polypropylene film 4a and 1 roll of polypropylene fabric) was changed to a common homo-polypropylene film, and the rest materials and the process were unchanged, so as to prepare a sample of comparative example 1. The strength of the product itself is significantly reduced because the product loses the reinforcing layer and the fabric.
Comparative example 2:
Unlike example 1, the polypropylene fiber cloth (layer 4 c) was omitted, and the rest of the materials and process were unchanged, to prepare a sample of comparative example 2.
Comparative example 3:
Different from example 1, the composite core layer 4 is replaced by a sheet of 30% glass fiber reinforced polypropylene, and the rest materials and the process are unchanged, so that a sample of comparative example 3 is prepared.
Comparative example 4:
Unlike example 1, the tension roller was set to 5N, and the remaining conditions were unchanged.
Comparative example 5:
unlike example 1, the tension roller was set to 200N, and the remaining conditions were unchanged.
Comparative example 6:
unlike example 1, the static electricity removing adsorption time was adjusted to 0s, i.e., static electricity adsorption was not performed, and the remaining conditions were unchanged.
Comparative example 7:
unlike example 1, the spot welding time was adjusted to 0s, i.e., spot welding was not performed, and the remaining conditions were unchanged.
Comparative example 8:
Different from example 1, the temperature of the heat preservation and pressure maintaining section in the processing condition of the double-steel-belt continuous rolling equipment is set to 175+/-1 ℃ and the pressure is 1.5Mpa, and the rest conditions are unchanged.
Comparative example 9:
Unlike example 1, the temperature of the heat-preserving and pressure-maintaining section in the processing conditions of the double-steel-belt continuous rolling equipment was set to 130 ℃, the pressure was 0.5Mpa, and the remaining conditions were unchanged.
The properties of the samples prepared in comparative examples 1-9 via examples 1-3 above were as follows:
It can be seen that by adopting the structure of the composite core layer 4, and preferably the total layer number is more than 30, the transverse tensile strength and the longitudinal tensile strength of the plate can be effectively improved and ensured, and the notch impact strength is effectively ensured by combining the arrangement of the fabric layers.
The invention realizes the continuous production of the polymer plate, can effectively realize the exhaust in the forming process, reduces or even avoids the formation of bubbles, greatly improves the production efficiency, and is beneficial to mass production and application expansion.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.

Claims (6)

1. A continuous production method of a polymer plate is characterized in that:
The polymer plate comprises a composite core layer (4), wherein the composite core layer (4) comprises a plurality of layers of unstretched polypropylene films (4 a), biaxially oriented polypropylene films (4 b) are arranged between adjacent unstretched polypropylene films (4 a) to form an alternate laminated structure, and the polymer plate further comprises a fabric layer (4 c), wherein the surface of the unstretched polypropylene film (4 a) is provided with an inward concave air passage (4 a 1);
The melting point of the unstretched polypropylene film (4 a) is 155-160 ℃, the molecular weight is 6-8 ten thousand, the melt flow rate is 5-8g/10min, the isotacticity of the biaxially oriented polypropylene film (4 b) is 95-99%, the melting point is 168-172 ℃, the molecular weight is 8-10 ten thousand, and the melt flow rate is 1-4g/10min;
The composite core layer (4) is of a laminated structure with more than 30 layers, one side of the composite core layer (4) is sequentially provided with a bonding layer (2) and an outer layer I (1), and the other side of the composite core layer (4) is provided with an outer layer II (5), wherein the outer layer I (1) is a biaxially oriented polyester film or a biaxially oriented nylon film, and the outer layer II (5) is polyester knitted cloth;
The concave air passage (4 a 1) is communicated along the length direction of the unstretched polypropylene film (4 a);
the continuous production method comprises the following steps of automatic unreeling, prepressing, spot welding, preheating, rolling and cutting;
In the automatic unreeling procedure, each layer of rolled film is sequentially placed on each unreeling roller according to the upper and lower layer laying sequence of the plate (90), the upper unreeling roller and the lower unreeling roller are symmetrically distributed to form a group of unreeling roller groups (10), a plurality of groups of unreeling roller groups (10) are horizontally and orderly arranged along the production direction, the rolled film positioned on the unreeling roller group (10) at the forefront end of the production direction forms the outermost layers on the upper and lower side surfaces of the plate (90), the rolled film positioned on the unreeling roller group (10) adjacent to the rear side forms the secondary outer layer, and similarly, the rolled film positioned on the unreeling roller group (10) at the rear end of the production direction forms the middle layer of the plate (90);
In the spot welding process, a spot welding device (40) is used for forming welding spots (91) by interval dotting at two edges of the pre-pressed plate lamination in the length direction, and the distance between the welding spots (91) and the edges is 3-5mm;
The front and back are provided with two preheating procedures, including preheating by a first preheating drying channel (20) connected to the rear end of the unreeling roller set (10), and preheating by a second preheating drying channel (50) after spot welding;
The rolling adopts continuous rolling equipment (70), wherein the continuous rolling equipment (70) comprises an upper group of steel belts and a lower group of steel belts which are linearly attached along the length direction, and four sections of temperature control and heat control sections are arranged along the length direction of the continuous rolling equipment (70) and sequentially comprise a preheating pre-pressing section, a heating and pressurizing section, a heat preservation and pressure maintaining section and a cooling and pressure maintaining section, wherein the heat preservation and pressure maintaining section reaches the highest temperature and is controlled at 168+/-1 ℃;
The prepressing adopts prepressing laminating rollers (30) which are arranged vertically symmetrically, and exhaust is carried out between layers through an inner concave air passage (4 a 1) during prepressing lamination.
2. The continuous production method of the polymer sheet as claimed in claim 1, wherein the unstretched polypropylene film (4 a) and the biaxially oriented polypropylene film (4 b) are of a single-layer structure, the unstretched polypropylene film (4 a) is made of random copolymer polypropylene, and the biaxially oriented polypropylene film (4 b) is made of isotactic polypropylene.
3. A continuous production method of a polymer sheet as claimed in claim 2, wherein the unstretched polypropylene film (4 a) is formed by casting with a casting machine, the unstretched polypropylene film (4 a) has a thickness of 0.01 to 0.02mm, and the biaxially oriented polypropylene film (4 b) is formed by extrusion with an extruder, the biaxially oriented polypropylene film (4 b) has a thickness of 0.02 to 0.03mm.
4. The continuous production method of the polymer sheet material as claimed in claim 1, wherein at least one fabric layer (4 c) is arranged in the composite core layer (4), the two sides of the fabric layer (4 c) are bonded with the unstretched polypropylene film (4 a), the fabric layer (4 c) is one of polypropylene fiber fabric, polypropylene-coated polyester fiber fabric and polypropylene-coated nylon fiber fabric, the fabric layer (4 c) adopts a plain weave or twill weave structure, the fiber structure of the fabric layer (4 c) is round yarn, the specification is 500-2000D, and the draft ratio is 6-8.
5. The continuous production method of the polymer sheet material, as set forth in claim 1, is characterized in that the structure of the single unreeling roller set (10) comprises reels which are symmetrically arranged up and down and are used for placing coiled materials (13), electrostatic roller brushes (12) are respectively arranged at the leading-out ends of the coiled materials (13), the upper coiled materials (13) and the lower coiled materials (13) are oppositely and forwards jointed and led out, and a tensioning traction device (11) is arranged at the joint;
The number of unreeling roller sets (10) used is determined by the number of layers that make up the sheet (90).
6. The continuous production method of the polymer sheet as claimed in claim 1, wherein the preheating and prepressing section is controlled to be 120-150 ℃ and 0.5-1Mpa in temperature, the heating and pressurizing section is controlled to be 150-168 ℃ in temperature and 1-2Mpa in pressure, the heat preservation and pressure maintaining section is controlled to be 168+/-1 ℃ in temperature and 1-2Mpa in pressure, the cooling and pressure maintaining section is controlled to be 60-90 ℃ in temperature and 1-2Mpa in pressure, and the total duration of the laminated film flowing through the four sections is 3-15min.
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Publication number Priority date Publication date Assignee Title
US5429696A (en) * 1990-11-12 1995-07-04 Hoechst Aktiengesellschaft Process for producing a multilayered film composite from thermoplastic, coextruded plastic film webs
CN103481611A (en) * 2007-05-08 2014-01-01 亨特道格拉斯工业瑞士有限责任公司 Multivariate color system with texture application
CN105563976A (en) * 2014-10-15 2016-05-11 中国石油化工股份有限公司 Polypropylene self-reinforced composite and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5429696A (en) * 1990-11-12 1995-07-04 Hoechst Aktiengesellschaft Process for producing a multilayered film composite from thermoplastic, coextruded plastic film webs
CN103481611A (en) * 2007-05-08 2014-01-01 亨特道格拉斯工业瑞士有限责任公司 Multivariate color system with texture application
CN105563976A (en) * 2014-10-15 2016-05-11 中国石油化工股份有限公司 Polypropylene self-reinforced composite and preparation method thereof

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