Hot concatenation type flexible container
阅读说明：本技术 一种热拼接型集装袋 (Hot concatenation type flexible container ) 是由 陆伟錩 于 2019-11-04 设计创作，主要内容包括：本发明涉及集装袋,具体涉及一种热拼接型集装袋。一种热拼接型集装袋,它包括集装袋本体1,在所述集装袋本体1顶部中间和底部中间位置分别设有进料口2和出料口3,在所述集装袋本体1上部四个角落均设有加强型吊带4,在所述集装袋本体1的三角交汇处均设有密封三角模块5,所述集装袋本体1的袋身从里到外分别包括防水层6、基布层7和防水层6,所述防水层6为PE和PP的复合膜。本发明提供的集装袋,采用热合密封拼接工艺,大大提高了集装袋生产的自动化程度,具有良好的密封防水防潮性能,且不必增加内衬袋,减轻了包装袋整体重量,节约原料。(The invention relates to a flexible freight bag, in particular to a thermal splicing flexible freight bag. The utility model provides a hot concatenation type flexible container, it includes flexible container body 1 in the middle of the flexible container body 1 top and bottom intermediate position are equipped with feed inlet 2 and discharge gate 3 respectively four corners in flexible container body 1 upper portion all are equipped with strenghthened type suspender 4 the triangle intersection of flexible container body 1 all is equipped with sealed triangle module 5, flexible container body 1's bag body includes waterproof layer 6, base cloth layer 7 and waterproof layer 6 from inside to outside respectively, waterproof layer 6 is the complex film of PE and PP. The flexible freight bag provided by the invention adopts a heat seal splicing process, greatly improves the automation degree of flexible freight bag production, has good sealing waterproof and moistureproof performances, does not need to increase a lining bag, reduces the whole weight of the packaging bag and saves raw materials.)
1. The utility model provides a hot concatenation type flexible container, its characterized in that, it includes flexible container body (1) be equipped with feed inlet (2) and discharge gate (3) respectively with bottom intermediate position in the middle of the flexible container body (1) top four corners in flexible container body (1) upper portion all are equipped with strenghthened type suspender (4) the triangle intersection of flexible container body (1) all is equipped with sealed triangle module (5), the bag body of flexible container body (1) includes waterproof layer (6), base cloth layer (7) and waterproof layer (6) from inside to outside respectively, waterproof layer (6) are the complex film of PE and PP.
2. The thermally spliced flexible freight bag according to claim 1, wherein the flexible freight bag body (1) is formed by heat-sealing and splicing, and the process conditions of the heat-sealing and splicing are as follows: the temperature is 280-320 ℃, the weight of the pinch roller is 40-60 kg, and the walking speed is 15-25 m/min.
3. The thermally spliced flexible freight bag according to claim 1, wherein the weight ratio of the raw materials PE and PP prepared in the composite film of PE and PP is 1: (3-5).
4. The thermally spliced flexible freight bag according to any one of claims 1 to 3, wherein the raw materials for preparing the PE/PP composite film further comprise 2.1 to 3 wt% of an antistatic agent and 3 to 5 wt% of an ultraviolet resistant agent.
5. The thermally spliced shipping container of claim 4, wherein said antistatic agent is at least one selected from the group consisting of cationic antistatic agents, anionic antistatic agents, nonionic antistatic agents, and amphoteric antistatic agents.
6. The thermally spliced shipping sack of claim 5 wherein said antistatic agent is a cationic antistatic agent or an amphoteric antistatic agent.
7. The thermally spliced shipping sack of claim 4, wherein said uv-resistant agent is an inorganic uv-resistant agent and/or an organic uv-resistant agent.
8. The thermally spliced bulk bag according to claim 1, wherein the waterproof layer (6) and the base fabric layer (7) have a grammage ratio of 1: (5-7).
9. A thermally spliced bulk bag according to claim 1, wherein the junction of the bulk bag body (1) and the reinforcing straps (4) is further provided with a reinforcing module (8).
10. A method of manufacturing a thermally spliced bulk bag according to any one of claims 1 to 9, comprising at least the steps of:
1) weaving: the base cloth is woven by adopting warp and weft, and the warp-weft ratio of the base cloth is 1: (0.7 to 1.2);
2) coating: coating the inner surface and the outer surface of the base cloth prepared in the step 1) with a PE and PP composite film by adopting a double-sided film coating process to obtain a finished cloth, wherein the running speed of the double-sided film coating process is 50-70 m/min;
3) molding: cutting the finished fabric obtained in the step 2), and performing heat seal, sealing, splicing and molding to obtain the fabric.
Technical Field
The invention relates to the technical field of flexible freight bags, in particular to a thermal splicing flexible freight bag.
Background
Along with the transformation and upgrading of the industry, new requirements such as more centralization, high efficiency, convenience and the like are provided for the packaging of products, and the flexible freight bag has the advantages of good filling performance and convenience in quick loading and unloading, so that the flexible freight bag is more and more favored by the market. Heretofore, bulk bags have become one of the major tools for industrial bulk cargo, powder packaging, and transportation in the world, and are widely used in various fields such as chemical industry, mineral industry, agriculture, building materials, food and medicine, and the like.
However, unlike high-tech products such as electronics and communications, the current flexible freight bags are still labor-intensive products, require a large number of skilled operators, and are labor-intensive and labor-costly. With the upgrading of industry and the change of labor force, such workers are more difficult to attract and stabilize personnel, so that the problem of production automation needs to be solved.
After a lot of research and trial, although certain improvement is made in the aspect of production process, the process of production automation is also promoted to a certain extent. However, the process is not perfect enough, the raw materials are not selected reasonably, and the like, so that the commercial flexible freight bags can not meet the requirements of cleanliness, forming effect, production efficiency, bag body strength, ultraviolet resistance and color uniformity.
Disclosure of Invention
In order to solve the problems, the invention provides a thermally spliced flexible freight bag, which comprises a flexible freight bag body 1, wherein a
As a preferred technical scheme of the invention, the flexible freight bag body 1 is formed by heat sealing and splicing, and the process conditions of the heat sealing and splicing are as follows: the temperature is 280-320 ℃, the weight of the pinch roller is 40-60 kg, and the walking speed is 15-25 m/min.
As a preferable technical scheme of the invention, the weight ratio of the raw materials PE and PP prepared in the PE and PP composite film is 1: (3-5).
As a preferable technical scheme, the raw materials for preparing the PE and PP composite film further comprise 2.1-3 wt% of an antistatic agent and 3-5 wt% of an ultraviolet resistant agent.
In a preferred embodiment of the present invention, the antistatic agent is at least one selected from the group consisting of a cationic antistatic agent, an anionic antistatic agent, a nonionic antistatic agent, and an amphoteric antistatic agent.
As a preferred technical scheme of the invention, the antistatic agent is a cationic antistatic agent and an amphoteric antistatic agent.
In a preferred embodiment of the present invention, the anti-uv agent is an inorganic anti-uv agent and/or an organic anti-uv agent.
As a preferred technical solution of the present invention, the gram weight ratio of the
As a preferable technical scheme of the invention, a
The invention provides a preparation method of a hot splicing type container bag, which at least comprises the following steps:
1) weaving: the base cloth is woven by adopting warp and weft, and the warp-weft ratio of the base cloth is 1: (0.7 to 1.2);
2) coating: coating the inner and outer surfaces of the base cloth prepared in the step 1) with a PE and PP composite film by adopting a double-sided film coating process to obtain a finished cloth;
3) molding: cutting the finished fabric obtained in the step 2), and performing heat seal, sealing, splicing and molding to obtain the fabric.
Has the advantages that: according to the hot splicing type flexible freight bag prepared by the invention, by adopting special processes and components, on one hand, the inherent problems of high labor intensity and high labor cost in the flexible freight bag production process are solved, and the automation degree of production is greatly improved; on the other hand, through the mutual cooperation of various components, the cleanliness of the flexible freight bag is improved, the composite film of PE and PP has certain surface energy, the agglomeration and the extension of surface active molecules are effectively regulated and controlled, the surface of the film has proper roughness, and the forming effect of the flexible freight bag is improved. In addition, the invention also improves the weaving efficiency of the base cloth, has the advantage of high production speed, has certain expansion rate and rebound rate in the stretching and stress processes, and enables splicing to be more compact through high-temperature melting and curing reaction, thereby improving the strength of the bag body. The flexible freight bag provided by the invention also has good ultraviolet resistance, is not easy to age, and disperses the repulsive force effect of the additional auxiliary agent and the polymer matrix material, so that the compatibility of the system is improved, the color uniformity of the bag body is further improved, and the whole body is more attractive. In addition, because of all there is waterproof and moistureproof coating inside and outside the substrate, the concatenation department all adopts the sealed concatenation of heat seal, adopts sealed triangle module at triangle intersection, can reach the complete sealed waterproof and moistureproof performance of whole bag, needn't increase interior lining bag, alleviates the whole weight of wrapping bag, and material saving is equipped with the reinforcing module at the suspender position, reduces the tearing stress of suspender, ensures the fastness of suspender.
Drawings
FIG. 1 is a schematic external view of a bulk bag according to example 1.
Fig. 2 is a schematic composition diagram of the body of the bulk bag in example 1.
Description of the symbols: 1-bulk bag body; 2-a feed inlet; 3-discharging port; 4-reinforced type hanging strip; 5-sealing the triangular module; 6-waterproof layer; 7-a base fabric layer; 8-enhancement module
Detailed Description
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The words "preferred," "more preferred," "most preferred," and the like in this disclosure mean embodiments of the invention that may, in some instances, provide some benefit. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
In order to solve the problems, the invention provides a thermally spliced flexible freight bag, which comprises a flexible freight bag body 1, wherein a
The top in the context of the present invention refers to the uppermost surface of the bulk bag, i.e. the surface seen from above, as opposed to the bottom.
The upper part of the invention refers to the upper half part of the bag body of the flexible freight bag.
The triangular junctions described in the invention refer to 8 triangular junctions at the junction of every three adjacent surface vertexes of the bulk bag.
Flexible container body 1
The Flexible Intermediate Bulk Container (FIBC), also called Flexible Bulk bag, ton bag, space bag, etc. is one kind of Container unit, and may be transported in Container unit with crane or fork truck. The flexible container is widely used for transporting and packaging powdery, granular and blocky articles such as food, grain, medicine, chemical industry, mineral products and the like, and is generally used as a packaging product for transportation and storage in developed countries.
The invention has no special limitation on the size of the bulk bag body, can be designed according to the characteristics of products, and can also be customized according to the special requirements of end users.
As examples of the dimensions of the body of the bulk bag, the lengths can be listed as: 900cm, 910cm, 920cm, 930cm, 940cm, 950cm, 960cm, 970cm, 980cm, 990cm, 1000 cm; the widths can be listed as: 900cm, 910cm, 920cm, 930cm, 940cm, 950cm, 960cm, 970cm, 980cm, 990cm, 1000 cm; highly enumerated are: 1000cm, 1050cm, 1100cm, 1150cm, 1200cm, 1250cm, 1300cm, 1350cm, 1400cm, 1450cm, 1500 cm.
Heat seal splicing
The heat seal splicing, which is called heat splicing for short, is characterized in that a heat sealing device is utilized to heat the sealing part of a plastic film to be in a viscous flow state, two layers of films are fused into a whole by means of certain pressure, and certain strength and sealing performance are kept after cooling, so that a product can bear certain external force in the processes of packaging, transportation, storage and sale, and the phenomena of cracking, leakage and the like of the product are avoided, and the purpose of protecting the product is achieved.
In a preferred embodiment, the bulk container 1 of the present invention is made by heat sealing and splicing, and the process conditions of the heat sealing and splicing are as follows: the temperature is 280-320 ℃, the weight of the pinch roller is 40-60 kg, and the walking speed is 15-25 m/min.
In a more preferred embodiment, the process conditions for the heat seal splicing of the present invention are as follows: the temperature is 300 ℃, the weight of the pinch roller is 50kg, and the running speed is 20 m/min.
The pressing wheel is a component in the heat sealing device and is used for providing certain pressure.
The walking speed refers to the speed of the pinch roller.
Feed inlet 2
The feed inlet refers to a part for loading materials on the flexible freight bag.
The shape of the feed inlet is not particularly limited, and the feed inlet can be cuboid, square, cylindrical or irregular, and can be customized according to the special requirements of end users.
In a preferred embodiment, the feed gap according to the invention is cylindrical.
The size of the feed inlet is not particularly limited, and the feed inlet can be designed according to the characteristics of products and can also be customized according to the special requirements of end users.
When the feed inlet is cylindrical, the diameter of the cylinder may be: 50cm, 55cm, 60cm, 65cm, 70cm, 75cm, 80 cm; the height of the cylinder may be: 60cm, 65cm, 70cm, 75cm, 80cm, 85cm, 90cm, 95cm, 100 cm.
The feeding hole is in an open state before charging.
The discharge port refers to a discharging part of the flexible freight bag.
The shape of the discharge hole is not particularly limited, and the discharge hole can be cuboid, square, cylindrical or irregular, and can also be customized according to the special requirements of the end user.
In a preferred embodiment, the discharge hole of the present invention has a cylindrical shape.
The size of the discharge port is not particularly limited, and the discharge port can be designed according to the characteristics of products and can also be customized according to the special requirements of end users.
When the discharge port is cylindrical, the diameter of the cylinder may be: 40cm, 45cm, 50cm, 55cm, 60cm, 65cm, 70 cm; the height of the cylinder may be: 30cm, 35cm, 40cm, 45cm, 50cm, 55cm, 60cm, 65cm, 70 cm.
The discharge port is in a sealed state before charging.
In a preferred embodiment, the sealing of the discharge hole is performed by heat sealing with metallocene polyethylene plastic film.
The metallocene polyethylene is a novel thermoplastic, is produced by using Metallocene (MAO) as a polymerization catalyst, and has unique and excellent properties.
Reinforced sling 4
The invention relates to a reinforced sling, in particular to a sling device which is arranged on a flexible freight bag and used for lifting a forklift and a crane.
The invention has no special limitation on the style and size of the reinforced sling, and can be designed according to the characteristics of products and customized according to the special requirements of end users.
As examples of strap widths, there may be mentioned: 60cm, 65cm, 70cm, 75cm, 80cm, 85cm, 90 cm.
In a preferred embodiment, the height of the overlapping portion of the reinforced hanging strip 4 and the bag main body 1 is 20 to 30 cm.
In a more preferred embodiment, the height of the overlapping portion of the reinforced sling 4 and the bag body 1 of the present invention may be: 20cm, 21cm, 22cm, 23cm, 24cm, 25cm, 26cm, 27cm, 28cm, 29cm, 30 cm.
Sealing
The sealing triangular module is a component connected at the intersection point of the vertexes of every three adjacent surfaces of the bulk bag (namely, the triangular intersection), and is used for improving the sealing performance of the bulk bag.
The number of the sealing
In a preferred embodiment, the sealing
The hot melt adhesive is not particularly limited in the present invention, as long as the sealing
In a preferred embodiment, the hot melt adhesive of the present invention is an EVA hot melt adhesive.
The EVA hot melt adhesive is also called ethylene/vinyl acetate copolymer, and is a plastic material consisting of ethylene (E) and Vinyl Acetate (VA).
The waterproof layer is a PE and PP composite film coated on the inner surface and the outer surface of the base cloth layer by adopting a double-sided film coating process, so that waterproof and moistureproof performances are endowed to the flexible freight bag.
In a preferred embodiment, the weight ratio of the raw materials PE and PP prepared in the composite film of PE and PP of the present invention is 1: (3-5).
In a more preferred embodiment, the weight ratio of the raw materials PE and PP prepared in the composite film of PE and PP according to the present invention is 1: 4.
in a preferred embodiment, the raw material for preparing the PE and PP composite film further comprises 2.1-3 wt% of an antistatic agent and 3-5 wt% of an anti-ultraviolet agent.
Antistatic agent
The antistatic agent of the present invention refers to an additive which is added into plastics or coated on the surface of a molded product to achieve the purpose of reducing static accumulation.
In a preferred embodiment, the antistatic agent according to the present invention is selected from at least one of cationic antistatic agents, anionic antistatic agents, nonionic antistatic agents, amphoteric antistatic agents.
In a preferred embodiment, the antistatic agents of the present invention are cationic antistatic agents and amphoteric antistatic agents.
As examples of cationic antistatic agents, mention may be made of: behenyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, dipalmitoyl ethyl dimethyl ammonium chloride, distearyl ethyl dimethyl ammonium chloride, ethyl dipalmitate hydroxyethyl methyl ammonium methyl sulfate, ethyl distearate hydroxyethyl methyl ammonium methyl sulfate.
As examples of the amphoteric antistatic agent, there may be mentioned: sodium laurylaminopropionate, sodium lauryldimethylbetaine, ammonium lauryldihydroxyethyl betaine, lauryl dimethylbetaine, ammonium cocoyl glycinate, N-dimethyldodecyl betaine, octadecyl dihydroxyethyl amine oxide, tetradecyldihydroxyethyl amine oxide, octadecyl amidopropyl amine oxide, cocoamidopropyl amine oxide.
In a more preferred embodiment, the antistatic agents of the present invention are cetyltrimethylammonium chloride and dodecyldimethylbetaine.
In a more preferred embodiment, the weight ratio of the hexadecyl trimethyl ammonium chloride to the dodecyl dimethyl betaine is (2.5-3.5): 1.
in a most preferred embodiment, the weight ratio of cetyltrimethylammonium chloride and dodecyldimethyl betaine according to the invention is 3: 1.
because the inner layer and the outer layer of the flexible freight bag are both coated with the PE/PP composite film, and static charges caused by mutual friction cannot be avoided when the high polymer synthetic material is used; and the carriers of the high polymer can not move, so that the resistivity of the high polymer is high, once the high polymer carries a trace amount of static charges, the static charges can not leak to accumulate in the occasion of the non-electric insulating material, and extremely high static voltage is generated, and even discharge hazard can be generated. On the other hand, due to the existence of static electricity, the polymer synthetic material film is easy to deposit dust and pollute in use and is difficult to clean, and the overall cleanliness of the polymer synthetic material film is influenced. The inventor adopts a method of adding the antistatic agent into the PE/PP composite film, and the antistatic agent is used for adsorbing moisture in the air to form a layer of conductive film on the surface of the PE/PP composite film, so that the conductive film has certain conductivity, and the cleanliness of the bulk bag is improved. However, since the mechanism of action of the antistatic agent is based on a combination of various mechanisms, it can reduce the generation of static charge and increase the smoothness of the film surface, thereby lowering the coefficient of friction. Because the invention adopts the double-sided film coating process, the applicant worries about that the friction coefficient of the bag body at the inner side of the flexible freight bag is too small, so that the bottom of the flexible freight bag is stressed too much in the process of loading, and the forming effect of the flexible freight bag is also reduced.
However, the inventors have unexpectedly found that when the amount ratio of PE and PP is controlled to be 1: (3-5), simultaneously selecting hexadecyl trimethyl ammonium chloride and dodecyl dimethyl betaine as antistatic agents, and controlling the weight ratio of the hexadecyl trimethyl ammonium chloride to the dodecyl dimethyl betaine to be (2.5-3.5): 1, the forming effect of the flexible freight bag can be improved. Probably because the PE and the PP have certain fluidity under the condition of proper proportion; and when the antistatic agent is hexadecyl trimethyl ammonium chloride and dodecyl dimethyl betaine, especially when the weight ratio of the hexadecyl trimethyl ammonium chloride to the dodecyl dimethyl betaine is (2.5-3.5): 1, through the mutual synergistic action of hexadecyl trimethyl ammonium chloride and dodecyl dimethyl betaine, the compatibility with a high polymer material is improved, the composite film can continuously migrate from the inside of the high polymer material to the surface of the high polymer material at a proper migration speed so as to supplement the consumption of the surface, so that a dynamic balance is achieved, the composite film has certain surface energy, the agglomeration and the extension of surface active molecules are effectively regulated and controlled, the surface of a PE/PP composite film has proper roughness, and the forming effect of the flexible freight bag is improved.
Anti-ultraviolet agent
The ultraviolet inhibitor is also called ultraviolet inhibitor, ultraviolet absorbent or ultraviolet screening agent, and is a substance capable of inhibiting and delaying ultraviolet rays from causing photoaging to polymers.
In a preferred embodiment, the uv inhibitor of the present invention is an inorganic uv inhibitor and/or an organic uv inhibitor.
As examples of the inorganic anti-ultraviolet agent, there may be mentioned: zinc oxide, nano zinc oxide, titanium dioxide, nano titanium dioxide, iron oxide, nano iron oxide, talcum powder, titanium dioxide, pottery clay powder and carbon black.
As examples of the organic ultraviolet-resistant agent, there may be mentioned: 2- (2 '-hydroxy-3', 5 '-di-t-butylphenyl) -5-chlorobenzotriazole (trade name: UV-327), 2- (2' -hydroxy-3 '-t-butyl-5' -methylphenyl) -5-chlorobenzotriazole (trade name: UV-326), 2-hydroxy-4-n-octoxybenzophenone (trade name: UV-531), 2- (2H-benzotriazol-2-yl) -4, 6-bis (1-methyl-1-phenylethyl) phenol (trade name: UV-234), 2- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -5- [ (hexyl) oxy ] -phenol (trade name: UV-1577).
In a more preferred embodiment, the anti-UV agent of the present invention is 2-hydroxy-4-n-octoxybenzophenone and talc.
The talcum powder is magnesium silicate mineral talc, the main component of the talcum powder is hydrous magnesium silicate, and the talcum powder is prepared by crushing, treating with hydrochloric acid, washing with water and drying, and is commonly used as fillers of plastics and paper products, rubber fillers, anti-sticking agents of rubber products, high-grade paint and coating and the like.
In a preferred embodiment, the fineness of the talcum powder is 1000-1500 meshes.
In a more preferred embodiment, the talc according to the invention has a fineness of 1250 mesh.
The talcum powder with the fineness of 1250 meshes can be obtained commercially, for example, the commercially available talcum powder with the fineness of 1250 meshes comprises but is not limited to a product with the model number of TL-611, which is purchased from Tenglong mining company, Inc. in the sea city.
In a preferred embodiment, the weight ratio of the 2-hydroxy-4-n-octoxybenzophenone to the talcum powder is (1-3): 1.
in a more preferred embodiment, the weight ratio of 2-hydroxy-4-n-octoxybenzophenone and talc according to the invention is 2: 1.
in a preferred embodiment, the gram weight of the
In a more preferred embodiment, the
Base cloth layer 7
The base fabric layer of the present invention is a base fabric woven with warp and weft.
In a preferred embodiment, the basis layer 7 of the present invention has a grammage of 150 to 210g/m2。
In a more preferred embodiment, the basis layer 7 of the present invention has a grammage of 180g/m2。
In a preferred embodiment, the gram weight ratio of the
In a more preferred embodiment, the gram weight ratio of the
the applicant has found that when the gram weight ratio of the
In a preferred embodiment, the junction of the bulk bag 1 and the reinforcing straps 4 of the present invention is further provided with a reinforcing
The number of the
The reinforcing module of the present invention is a member provided at the joint between the reinforcing strap 4 and the bag body 1 to improve the tensile strength of the strap.
The shape and size of the reinforcing module are not particularly limited, and the reinforcing module can be designed according to the characteristics of a product and can also be customized according to the special requirements of an end user.
As examples of the shape of the reinforcing block, there may be: rectangle, square, ellipse, parallelogram, rhombus, trapezoid.
In a preferred embodiment, the reinforcing module of the invention is rectangular in shape.
When the reinforcing module is rectangular, its length may be: 140mm, 145mm, 150mm, 155mm, 160 mm; its width may be: 40mm, 45mm, 50mm, 55mm, 60 mm.
In a preferred embodiment, the reinforcing
The hot melt adhesive is not particularly limited in the present invention, as long as the reinforcing
In a preferred embodiment, the hot melt adhesive of the present invention is an EVA hot melt adhesive.
The invention provides a preparation method of a hot splicing type container bag, which at least comprises the following steps:
1) weaving: the base cloth is woven by adopting warp and weft, and the warp-weft ratio of the base cloth is 1: (0.7 to 1.2);
2) coating: coating the inner and outer surfaces of the base cloth prepared in the step 1) with a PE and PP composite film by adopting a double-sided film coating process to obtain a finished cloth;
3) molding: cutting the finished fabric obtained in the step 2), and performing heat seal, sealing, splicing and molding to obtain the fabric.
The present invention has no particular limitation on the method for producing the warp and weft described in step 1), as long as the desired warp and weft can be obtained without affecting the object of the present invention. For example, the warp and weft yarns may be prepared by: extruding the raw materials for preparing warp and weft into film, cutting into strips, and finally stretching and shaping.
In a preferred embodiment, the raw materials for preparing the warp and weft in the step 1) are PE and/or PP.
In a more preferred embodiment, the raw material for preparing the warp and weft in the step 1) is PP.
In a preferred embodiment, the warp-weft ratio of the base fabric in the step 1) is 1: 1.
in a preferred embodiment, the running speed of the double-sided laminating process in the step 2) is 50-70 m/min.
In a more preferred embodiment, the running speed of the double-sided lamination process in the step 2) is 60 m/min.
The prior knitting machine and the warp and weft inserting knitting technology thereof in China can only insert the warp and weft yarns in parallel layer by layer and do not have the function of interweaving the warp and weft yarns, so the knitting efficiency is limited to a certain extent, namely the production efficiency is reduced. In the production process of the flexible freight bag, in order to ensure the use performance of the flexible freight bag, the bag body of the flexible freight bag is often required to meet certain strength requirements, and for woven cloth, the tighter the cloth is, the higher the strength of the woven cloth is generally. And the size of longitude and latitude ratio has important influence to the degree of closeness of knitting, and under the general condition, when latitudinal direction density is higher than warp direction density, can make the knitting inseparabler. However, the efficiency of weft weaving is low compared to warp weaving, i.e., an increase in weft density results in a decrease in weaving efficiency. The inventor has improved through increase longitude and latitude ratio in this application and has woven efficiency, and then has improved the output of production efficiency and product. However, the increase in the warp-to-weft ratio causes the tightness of the knitted fabric to be reduced, and the inventors are concerned about the strength of the bulk bag body to be reduced.
However, the inventors have found that when the warp/weft ratio of the base fabric layer 7 is controlled to be 1: (0.7-1.2) and the gram weight of the
When the gram weight of the base fabric layer is too high, the expansion rate and the rebound rate of the flexible freight bag can be influenced, and the strength of the bag body is not improved; on the other hand, when the gram weight of the waterproof layer is too high or the heat-sealing temperature is not proper, the curing reaction is incomplete, and the strength of the bag body is reduced.
Because the flexible freight bag is usually used outdoors, the flexible freight bag can be exposed to the sun and rain for a long time, especially along with the damage of an ozone layer, the ultraviolet radiation phenomenon is more and more serious, the aging of the flexible freight bag is easily caused, and then the service performance of the flexible freight bag can be damaged and the service life of the flexible freight bag can be shortened. The inventor adopts a method of adding the ultraviolet resistant agent, and improves the ultraviolet resistant effect by using the inorganic ultraviolet resistant agent and the organic ultraviolet resistant agent in a matching way; and a double-sided film coating process is adopted, and the inner layer and the outer layer of the bag body are coated with ultraviolet-proof layers, so that the ultraviolet-proof capability of the flexible freight bag is further improved. However, 2-hydroxy-4-n-octoxy benzophenone contains benzene rings with large steric hindrance and is difficult to react with a base material, so that the compatibility of a system is poor, and the inventor is concerned about that the color of the bag body is not uniform, thereby affecting the aesthetic property of the flexible freight bag.
However, the inventor unexpectedly found that when the anti-ultraviolet agent is 2-hydroxy-4-n-octoxybenzophenone and talcum powder, and the weight ratio of the two is (1-3): 1, the color uniformity of the bag body can be improved when the running speed of the double-sided film coating process is controlled to be 50-70 m/min. The reason is probably that under the condition of a specific proportion, 2-hydroxy-4-n-octoxy benzophenone and talcum powder are mutually synergistic, so that the steric effect of a system and the intermolecular friction are weakened, and meanwhile, in the double-sided laminating process, the 2-hydroxy-4-n-octoxy benzophenone and the talcum powder can be diffused or transferred into a base material at a proper speed by selecting a proper walking speed condition, so that the repulsive force effect with a high-molecular base material is dispersed, the compatibility of the system is improved, and the color uniformity of the bag body is improved.
The present invention will now be described in detail by way of examples, and the starting materials used are commercially available unless otherwise specified.
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