CN113511422B

CN113511422B - Completely degradable kraft paper buffer air cushion and preparation method thereof

Info

Publication number: CN113511422B
Application number: CN202110381502.3A
Authority: CN
Inventors: 涂宗铃; 陈赐辉; 蔡佳煌
Original assignee: Xiamen Ameson New Material Inc
Current assignee: Xiamen Ameson New Material Inc
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2023-04-11
Anticipated expiration: 2041-04-09
Also published as: CN113511422A

Abstract

The invention relates to the technical field of buffer packaging, in particular to a completely degradable kraft paper buffer air cushion and a preparation method thereof. The air storage device comprises a plurality of air storage units and air supply channels, wherein the air storage units and the air supply channels are formed by heat sealing of two layers of air cushion films; an inflation inlet is arranged on the air supply channel; the top of each gas storage unit is provided with a heat seal ring, a gas inlet is formed between every two adjacent heat seal rings, and the gas supply channel is connected with the gas storage units through the gas inlets; the air storage unit consists of a plurality of air storage chambers, and the air storage chambers are connected through air necks; the air storage chamber has an S-shaped structure. The needle-shaped calcium carbonate is added into the degradable laminating material of the buffer air cushion to serve as a modifier, so that the crystallization performance and the melt strength of the material after laminating are improved, the opening of the laminating is improved, and the tensile strength is improved. In addition, the buffer air cushion has a special structure, and the air saturation of the product is improved and the wrapping buffer effect of the air cushion is improved by regulating and controlling the shape structure of the air storage chamber, the size of the air neck and the like.

Description

Completely degradable kraft paper buffer air cushion and preparation method thereof

Technical Field

The invention relates to the technical field of buffer packaging, in particular to a completely degradable kraft paper buffer air cushion and a preparation method thereof.

Background

With the change of modern life style and the high-speed development of logistics industry, many articles are traded in a logistics mode, and in the process of storing or transporting the articles, the articles are difficult to avoid the conditions of extrusion, collision, falling and the like, so that the products are damaged or deformed, and serious loss is brought to people. In order to protect the product, the product is packaged by a packing box or the like before storage or transportation, and the purpose of protection is achieved by providing a certain buffering effect for the product. At present packing box commonly used includes paper packing carton and inflatable packaging bag, and traditional paper packing carton can not provide better buffering effect, can not play good guard action, so at the in-process of using, often need use foam, flexiplast etc. earlier will wait to pack the product and pass through multilayer packaging, put into the packing carton again to reach good anti-falling and anti-collision performance, but this has increased the cost of transportation undoubtedly, and it is extremely inconvenient to pack moreover.

Numerous buffer cushions are also available on the market, for example, chinese patent CN201720427827 discloses a gourd-shaped buffer cushion packaging structure, which has a structure similar to that in fig. 2. It is provided with and fills air flue, gas column, air chamber and isolation layer, and the upper membrane that will contain polyolefin and nylon etc. mainly bonds through upper and lower bond line and gets up with lower membrane and make, and the isolation layer that utilizes to set up plays fine guard action when the buffer air cushion is deposited, avoids the buffer air cushion to wet and unable normal use. Chinese patent CN201520696227 discloses a gourd-shaped air cushion film, which is improved in shape and structure of the air bag in the air cushion to form a regular dodecagon air bag, thereby increasing the inflation area, and since all directions of the regular dodecagon air bag are straight edges, the gourd-shaped air cushion film is convenient to roll up or fold from all directions when wrapping articles, thereby the gourd-shaped air cushion film is more convenient to use. And the branch inflation air passage is arranged in the air inlet and is arranged in a splayed shape, so that the inflation resistance is reduced, and the inflation efficiency is improved. However, the gourd-shaped airbag cushions disclosed in the above patents all have a small neck structure, which affects the inflation rate, and when the cushion is inflated at a high rate, a high local pressure is applied to the cushion, which easily causes the risk of the cushion bursting open. Although the inflation resistance can be reduced to some extent by arranging the air bag in a splayed shape or the like, the inflation saturation and the pressure resistance of the air cushion under the same condition are required to be further improved. In addition, the air cushion with the structure has poor performances in folding, curling, wrapping property of a package and the like, and needs to be further optimized. An air-packing material is disclosed in us patent No. 480971S1, which is disclosed in fig. 4 of its disclosure, and it is actually disclosed as a cushion in a double row structure (similar to the structure shown in fig. 3), in which there is also a column-shaped air cell structure, and air cells are connected with each other through an air neck. However, the air cushion with the structure also has the problems of low inflation efficiency due to small size of the air neck, and the inflation saturation and the pressure resistance are to be improved. On the other hand, since the airbag has a simple columnar structure, the wrapping property and the folding and curling properties of the package are poor. In addition, most of the existing products are made of materials such as polyolefin, nylon and the like, and a large amount of waste is generated after the products are used, so that the environment is polluted.

In summary, although some products for cushioning packaging are disclosed in the prior art, which attempt to solve the problems existing in the field of cushioning packaging, the inflation saturation, compression resistance, etc. of these cushioning pads need to be further improved due to the structural design differences of products such as air cushions. Moreover, improvements in raw materials for their preparation, processing techniques, etc. are needed to avoid environmental pollution. In view of the above technical problems, the present application discloses a production process and structure of a completely degradable puncture-resistant buffer-wrapped air cushion with low cost and good buffer performance.

Disclosure of Invention

In view of the above technical problems, a first aspect of the present application provides a fully degradable kraft paper cushion air cushion, which includes a plurality of air storage units and air supply passages formed by heat sealing two air cushion films; an inflation inlet is arranged on the air supply channel; the top of each gas storage unit is provided with a heat seal ring, a gas inlet is formed between every two adjacent heat seal rings, and the gas supply channel is connected with the gas storage units through the gas inlets; the gas storage unit consists of a plurality of gas storage chambers, and the gas storage chambers are connected through gas necks; the air cushion film consists of an outer layer and an inner layer; the outer layer is made of kraft paper, and the inner layer is made of degradable materials; the outer layer and the inner layer are bonded through a laminating film.

As a preferable technical solution, the air storage chamber has an S-shaped structure or a straight column structure; preferably, the size of the gas neck is not less than 45mm; preferably, the size of the gas neck is not more than 60mm.

As a preferable technical scheme, the heat seal ring extends towards the longitudinal direction to form a gas channel; preferably, the width of the air inlet of the air channel is 1-3cm.

As a preferable mode, the air cushion film is composed of an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of degradable materials, and the degradable materials are selected from one or more of PLA, PBAT and PPC; the preferable thickness of the outer layer is 30 to 50 micrometers, and the thickness of the inner layer is 10 to 30 micrometers.

As a preferred technical scheme, the degradable material is a degradable material modified by adopting a functional auxiliary agent; the functional auxiliary agent comprises dihydric alcohol and/or ester compounds.

As a preferable technical scheme, the melt index of the degradable material under the condition of 190 ℃/2.16kg is 7-12g/10 min.

As a preferable technical scheme, the functional auxiliary agent also comprises 1-3 wt% of needle-shaped nano calcium carbonate.

As a preferred technical scheme, the kraft paper is kraft paper after multi-section corona treatment; the surface roughness of the kraft paper is not less than 2 mu m; preferably, the grammage of the kraft paper is 20 to 8g, and the content of the needle blade pulp is not less than 95%.

A second aspect of the present application provides a method for preparing the fully degradable kraft paper cushion as described above, comprising the steps of:

(1) Flushing the screw with POE material containing 30-1500-mesh calcium carbonate;

(2) Placing a kraft paper coiled material on a machine platform placing frame, drawing the kraft paper coiled material to a casting die head of a film coating machine through a drawing wheel, and heating a drawing roller, the casting die head and a screw;

(3) Adding the preparation raw materials of the inner layer into a laminating machine, laminating the surface of kraft paper on a machine stand, then pressing by a cooling pressing wheel, slitting and rolling to obtain the air cushion film;

(4) And (3) placing the two air cushion films on the unwinding frame in a mode that the film spraying surfaces of the two air cushion films are opposite, heating a machine table die, and then carrying out heat sealing on the two air cushion films.

As a preferable technical scheme, the set temperature of the laminating machine in the laminating process in the step (3) is not higher than 140 ℃.

Has the advantages that: according to the buffer air cushion, the needle-type calcium carbonate is added into the degradable film-coated material as a modifier, so that the crystallization performance and the melt strength of the film-coated material after film coating are improved, the film is dried in a shorter time, the opening of the film is improved, the higher tensile strength is achieved, and meanwhile, the heat sealing performance is not influenced. In addition, the degradable material of the inner layer of the air cushion is added with the polylol such as the epoxidized soybean oil and the like as the modifier, so that the flowability of the laminating material is improved, the low-temperature laminating at the later stage is facilitated, the energy consumption is reduced, the production efficiency is improved, meanwhile, the material production degradation is avoided, and the service life of the product is prolonged. Meanwhile, according to the invention, the kraft paper is subjected to multi-section corona treatment, the surface roughness of the kraft paper is adjusted, and the surface of the kraft paper is heated, so that the adhesive force between the completely degradable material and the laminating material is increased. And secondly, POE materials are adopted as materials for pulling and washing the air cushion during the preparation process, so that the starting difficulty and the starting scrap are reduced, and the production stability is improved. In addition, the buffer air cushion has a special structure, and the shape structure of the air storage chamber, the sizes of the air neck, the air inlet of the air channel and the like are regulated, so that the inflation difficulty of the product is reduced, the inflation saturation of the product is improved, and the wrapping buffer effect of the air cushion is improved.

Drawings

Fig. 1 is a schematic view of a cushion structure of the new structure in embodiment 1 of the present application.

Fig. 2 is a schematic view of the structure of the gourd bulb shaped cushion in comparative examples 4 and 5 of the present application.

Fig. 3 is a schematic view of the structure of the four-row cushion of the present application in comparative example 6.

FIG. 4 is a schematic diagram of a dual-row buffer air cushion structure in USD480971S 1.

Fig. 5 is a scanning electron micrograph of the needle-shaped nano calcium carbonate of example 1 of the present application.

Wherein: 1-air supply channel, 2-inflation inlet, 3-air storage chamber, 4-air neck, 5-heat sealing ring, 2 e-air inlet, 2 f-air channel and 6-air storage unit.

Detailed Description

The technical features of the technical solutions provided by the present invention will be further clearly and completely described below with reference to the specific embodiments, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The words "preferred", "preferably", "more preferred", and the like, in the present invention, refer to embodiments of the invention that may provide certain benefits, under certain circumstances. 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.

It should be understood that other than in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that may vary depending upon the desired properties to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

A first aspect of the present application provides a fully degradable kraft paper cushion air-cushion, which includes a plurality of air storage units and air supply passages formed by heat-sealing two air cushion films; an inflation inlet is arranged on the air supply channel; the top of each gas storage unit is provided with a heat seal ring, a gas inlet is formed between every two adjacent heat seal rings, and the gas supply channel is connected with the gas storage units through the gas inlets; the gas storage unit is composed of a plurality of gas storage chambers, and the gas storage chambers are connected through gas necks.

When the air cushion is inflated, the air supply channel 1 expands, the inner and outer layer film papers are pulled apart in the horizontal plane direction, and the air supply channel 1 expands from a plane state into a three-dimensional shape with radian; the heat seal ring 5 is not inflated, so that the inner layer film paper and the outer layer film paper are contracted to generate displacement in the longitudinal direction of the horizontal plane due to natural fall during inflation, the inner layer film paper and the outer layer film paper are extruded by the heat seal ring 5, and the inner layer film paper and the outer layer film paper are pulled outwards in the horizontal plane direction and the air inlet 2e is automatically opened to inflate the air storage unit.

In some preferred embodiments, the air reservoir has an S-shaped structure or a right cylinder structure; preferably, the structure of the air storage chamber is S-shaped. The applicant finds that the air storage chamber air cushion adopting the straight column-shaped structure or the S-shaped structure with the specific air neck structure can achieve better inflation effect. The applicant also found that when the structure of the air storage chamber is arranged in an S-shaped structure, the air cushion inflation efficiency can be improved to a great extent, and the wrapping performance of the air cushion on packing materials can be further improved while the inflation saturation and the pressure resistance are improved.

A large number of experiments verify that the air neck at the minimum position of the air storage chamber has the size not less than 45mm, otherwise, the air cushion is inflated to cause the phenomenon of unsaturation. The size is not larger than 60mm, otherwise, the product of a customer is wrapped, and meanwhile, the buffering strength is greatly reduced, and the buffering effect is influenced. The structure can lead the compression resistance of the buffer air cushion to reach 1500kg/cm on one hand ² Above, on the other hand, the neck part is convenient for fold, and the good parcel customer product plays good buffering guard action. Further preferably, the size of the gas neck is not less than 45mm; preferably, the size of the air neck is not more than 60mm; preferably, the size range of the air neck is 45 to 60mm.

The heat sealing ring 5 in the air cushion has a certain depth in the longitudinal upper direction of the paper film to form an air channel 2f; when the gas is filled into the gas channel 2f, the gas is ensured to flow only to the gas storage unit 6, and backflow and pressure relief are prevented; the distance between the air inlets 2e is limited, and the phenomenon that the air pressure in the air channel 2f is too large, so that the heat sealing position at the heat sealing ring 5 is easy to expand and burst is avoided. Further, the heat seal ring extends to the longitudinal direction to form a gas channel; preferably, the width of the air inlet of the air channel is 1-3cm.

In some embodiments, the air cushion film of the present invention is comprised of an outer layer and an inner layer; the outer layer is prepared from kraft paper.

Further, the grammage of the kraft paper is 20-8g; preferably, the needle pulp content is not less than 95%; the preferred thickness of the outer layer is 30 to 50 micrometers.

The kraft paper is prepared by chemically pulping softwood wood fibers, pulping in a pulping machine, adding sizing materials, dyes, fillers and other components, and finally papermaking in a paper machine. Due to the material and the structure of the kraft paper, the buffer air cushion is easy to have excellent degradability, and the pollution to the environment after the air cushion product is used up can be effectively avoided. Grammage as used herein is the conventional unit of kraft weight measured in the art, and is the weight per meter of kraft paper, calculated according to methods conventional in the art. The applicant finds that in the process of preparing the buffer air cushion by using the conventional kraft paper, the problem that the kraft paper and an inner-layer film material are not firmly bonded easily and the problems of crispness, edge cracking and the like are caused when the laminated film is heated is solved, and when the kraft paper with a proper weight range, high needle pulp content and low filler content is adopted, the laminated film material can be well contacted with the surface of the kraft paper by using the flexibility of the kraft paper, so that the laminated film material is fully spread on the surface of the kraft paper, and the problems of edge cracking, crispness and the like are avoided. In addition, the thickness of the outer kraft paper needs to be reasonably regulated, and the poor inflation phenomenon can be caused due to the fact that the thickness of the kraft paper is too large and the air inlet resistance is too large in the rear bag making and inflation process. The production of too thin thickness is easy to cause the problem of transverse tearing and film breaking, and the puncture performance is greatly reduced.

More preferably, the kraft paper is kraft paper after multi-section corona treatment; the surface roughness of the kraft paper is not less than 2 μm.

The inner layer is made of the completely degradable material, and the completely degradable material and the kraft paper have a synergistic effect, so that the complete degradation of the air cushion is realized. The preparation raw material of the inner layer is a completely degradable material, and the specific selection of the completely degradable material is not particularly limited in the invention, and various degradable components well known to those skilled in the art can be adopted. Further, the degradable material is selected from one or more of PLA, PBAT and PPC; the thickness of the inner layer is 10 to 30 micrometers. Further, the melt index of the degradable material under the condition of 190 ℃/2.16kg is 2-5g/10 min.

In some preferred embodiments, the degradable material is a degradable material modified with a functional additive; the functional auxiliary agent comprises dihydric alcohol and/or ester compounds.

Preferably, the diol and/or ester compounds include, but are not limited to, hexylene glycol, butylene glycol, epoxidized soybean oil, and the like; in some preferred embodiments, the modified degradable material is modified by the diol and/or the ester compound, so that the melt index of the modified degradable material under the condition of 190 ℃/2.16kg is 7-12g/10 min. The degradable material of the inner layer film is improved by adopting the functional auxiliary agent, the melt flow rate of the inner layer material during film spraying is improved, the melt can be spread fully on the surface of kraft paper to form a film, the film spraying speed is increased, and the production efficiency is improved. In addition, because the plasticizing preparation is carried out in a low-temperature high-pressure mode, on one hand, the heating energy consumption of the screw can be reduced, on the other hand, the higher melt strength of the extruded melt from the laminating machine can be improved, the sufficient surface drying can be kept at the higher laminating speed, the problems of reverse adhesion and the like of the material in the air cushion preparation process are avoided, the production speed reaches 150m/min on the premise that the laminating thickness reaches 10 to 30 micrometers, and the efficiency is greatly improved. In addition, the completely degradable material is improved by adopting the dihydric alcohol and/or the ester compound, the flow rate of the melt is improved, and the production temperature of the air cushion is favorably reduced, so that the problems of degradation and the like of the laminating material under the high-temperature condition are favorably avoided.

Further, the functional auxiliary agent also comprises 1 to 3wt% of needle-shaped nano calcium carbonate; furthermore, the length range of the needle-shaped nano calcium carbonate is 8000-1500 micrometers, and the diameter of the needle-shaped nano calcium carbonate is 5~8 micrometers. The applicant finds that when a proper amount of needle-type nano calcium carbonate is added into the completely degradable material of the inner layer, the surface drying time of the inner layer material after the inner layer material is coated on the surface of kraft paper can be obviously improved, the tensile strength of the air cushion can also be obviously improved, and particularly, the effect is obvious when the needle-type nano calcium carbonate is added after the inner layer material is modified by dihydric alcohol and/or ester functional additives. The applicant speculates that the crystallization of the raw material of the inner layer can be promoted under the action of the needle-shaped nano calcium carbonate after the raw material for preparing the inner layer is melted and extruded in the laminating machine, so that the rapid solidification is realized. Due to the structural characteristics of the needle-shaped nano calcium carbonate, the needle-shaped nano calcium carbonate can induce the orderly accumulation of the molecular chains of the molten high polymer material after the melt material is extruded, and the crystallization of the high polymer material is promoted. The polymer melt can have higher cohesive strength through crystallization, and meanwhile, the polymer chain segment can enter a crystal lattice more quickly, so that the polymer chain segment is prevented from being in a high elastic state for a long time, and the anti-adhesion condition is avoided. Especially after the improvement of the diol or ester functional additives, the micromolecular functional additives can easily migrate in a melt, so that the micromolecular compounds can migrate to the surface of a film material in the solidification and forming process of a high polymer material after extrusion, thereby further causing film breaking and reverse adhesion. After the needle-shaped nano calcium carbonate is adopted, the phenomenon is obviously improved.

A second aspect of the present application provides a method for preparing the fully degradable kraft paper cushion air mattress as described above, comprising the steps of:

(1) Washing the screw with POE material containing 30% of calcium carbonate of 1500 meshes;

(4) And placing the two layers of air cushion films on a unreeling frame in a mode that the film spraying surfaces are opposite, heating a machine table die, and then carrying out heat sealing on the two layers of air cushion films.

Different from the traditional high-temperature 200 ℃ melting and laminating mode, the low-temperature high-pressure plasticizing mode is adopted in the application, and materials are plasticized, so that on one hand, the energy consumption can be reduced, the heating energy consumption of the screw can be reduced, and the cooling energy consumption of the cooling wheel can be reduced. On the other hand, enough strength can be kept after the material is discharged from the die orifice, the film coating speed of the film coating machine can be increased, the productivity is improved, and the phenomenon of film breaking and anti-sticking of the material is avoided. The thickness of the completely degradable material film can reach 10-30um, and the production speed can reach 150m/min at most. Meanwhile, the low temperature can reduce the degradation risk of the material in the high-temperature production environment, and improve the delivery performance and the quality guarantee period of the completely degradable material.

In the application, the temperature of the laminating machine does not need to be kept after reaching the set temperature, the POE material containing 30-1500-mesh calcium carbonate is added into the single-screw laminating machine for 5-7g/10min (190 ℃/2.16 kg) to wash the screw, the surface of the kraft paper is coated with a double-layer corona mode to improve the surface roughness of the kraft paper, a group of heating traction guide rollers are added at the contact position of the kraft paper and the coating material, the temperature is set to 220 ℃ to heat the surface of the kraft paper, and the adhesive force of the inner-layer completely degradable material to the surface of the kraft paper is improved. And (3) adding the completely degradable modified material after the POE material is smoothly coated on the coating machine, and replacing the roll after the coating material is completely replaced by the completely degradable material, so as to carry out formal production. This technology on the one hand can be with drenching the burnt material sanitization of membrane board in the screw rod, and it causes the rupture of membranes to separate out in avoiding follow-up production, and on the other hand POE material toughness of completely degradable material is stronger relatively, and the start degree of difficulty is lower, drenches the membrane earlier with POE and compares and to reduce the material start machine greatly and transfer the machine to scrap with adding completely degradable material and adopting completely degradable material start alone, contrast traditional PP simultaneously, HDPE, FDPE drenches the membrane material. The POE material has cooling performance similar to that of completely degradable material and is one excellent drawing material for film spraying and starting of degradable material.

Further, the film spraying process in the step (3) adopts a low-temperature high-pressure mode; preferably, the set temperature of the laminating machine is not higher than 140 ℃; preferably, the pressure is controlled in the range of 20 to 30 MPa.

Further preferably, the temperature of the film coating machine in the film coating process is set as follows:

feeding section	Heating section	Plasticizing section	Pressurizing section	Die orifice temperature
					100℃	120℃	130℃	130℃	135℃

The present invention will be specifically described below by way of examples. It is to be noted that the following examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, as many insubstantial modifications and variations of the invention described above will now occur to those skilled in the art.

Examples

Example 1: referring to fig. 1, the present embodiment provides a fully degradable kraft paper cushion, which includes a plurality of air storage units 6 and an air supply passage 1 formed by heat-sealing two air cushion films; said air supplyThe channel 1 is provided with an inflation inlet 2; the top of the gas storage unit is provided with heat sealing rings 5, a gas inlet 2e is formed between every two adjacent heat sealing rings 5, and the gas supply channel 1 is connected with the gas storage unit 6 through the gas inlet 2 e; the gas storage unit 6 consists of a plurality of gas storage chambers 3, and the gas storage chambers 3 are connected through gas necks 4; the air storage chamber 3 has an S-shaped structure; the size of the air neck 4 is 50mm; the heat seal ring 5 extends towards the longitudinal direction to form a gas channel 2f; the width of the gas inlet 2e of the gas channel is 2cm.

The completely degradable kraft paper buffer air cushion is prepared by compounding completely degradable plastics and kraft paper materials by adopting a laminating process, and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the thickness of the inner layer is 20 microns, the material is modified PLA, the melt index of the PLA is 4g/10min (190 ℃/2.16 kg), the modifying agent is epoxidized soybean oil and needle-shaped nano calcium carbonate, the materials are modified by the epoxidized soybean oil to obtain the material with the melt index of 9g/10min (190 ℃/2.16 kg), and then 2wt% of the needle-shaped nano calcium carbonate is added for melt blending granulation to obtain the material. The needle-type nano calcium carbonate adopted in the invention has a microstructure shown in figure 5, and the specific parameters are as follows:

crystal structure: calcite; particle morphology: flower petals; specific gravity: 2.45-2.7; average particle size: the long diameter is 8000-1500um, and the diameter is 5-8um; whiteness: is more than 97 percent; specific surface area: 8 +/-2 m ² /g。

The preparation method of the completely degradable kraft paper buffer air cushion comprises the following steps:

(1) Modifying and granulating the laminated material (inner layer material) by a double screw

(2) And (4) starting the film coating machine, raising the temperature to the following parameters, and directly raising the temperature without carrying out stage heat preservation in the temperature raising process.

(3) After the temperature reached the set temperature, the screw was rinsed by adding POE material containing 30-1500 mesh calcium carbonate at a melt index of 6g/10min (190 ℃/2.16 kg) to a single-screw laminator without holding the temperature.

(4) The surface roughness of the kraft paper is improved by adopting a double-layer corona mode (corona frequency is set to be 22HZ, 2-stage corona treatment is carried out) so that the surface roughness reaches 2 mu m, meanwhile, a group of heating and drawing guide rollers are added at the contact position of the kraft paper and the laminating material, and the temperature is set to be 220 ℃ so as to heat the surface of the kraft paper.

(5) After POE material drenches the membrane smoothly on the laminating machine, add complete degradable modified material (inlayer material) and go into to drench the membrane to the kraft paper surface on the board puts the frame (drench the membrane speed and be 100 m/min), then through cooling pinch roller pressfitting, cut, the rolling obtains the air cushion membrane.

(6) And (3) putting the two rolls of laminated films one above the other, oppositely placing the laminated film surfaces on a unwinding frame, heating a machine table die to 180 ℃, setting the speed to be 30m/min, and thermally sealing the two rolls of laminated paper together according to the mode shown in the figure 1 to obtain the laminated paper.

Comparative example 1

The present comparative example provides a cushion air-cushion comprising a plurality of air storage cells 6 and air supply passages 1 formed by heat-sealing two air cushion films; an inflation inlet 2 is arranged on the air supply channel 1; the top of the gas storage unit is provided with heat sealing rings 5, a gas inlet 2e is formed between every two adjacent heat sealing rings 5, and the gas supply channel 1 is connected with the gas storage unit 6 through the gas inlet 2 e; the gas storage unit 6 consists of a plurality of gas storage chambers 3, and the gas storage chambers 3 are connected through gas necks 4; the air storage chamber 3 has an S-shaped structure; the size of the air neck 4 is 50mm; the heat seal ring 5 extends towards the longitudinal direction to form a gas channel 2f; the width of the gas inlet 2e of the gas channel is 2cm.

The completely degradable kraft paper buffer air cushion is prepared by compounding completely degradable plastics and kraft paper materials by adopting a laminating process, and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the thickness of the inner layer is 20 microns, the material is modified PLA, the melt index of the PLA is 4g/10min (190 ℃/2.16 kg), the modifying agent is epoxidized soybean oil and needle-shaped nano calcium carbonate, the materials are modified by the epoxidized soybean oil to obtain the material with the melt index of 9g/10min (190 ℃/2.16 kg), and then 2wt% of the needle-shaped nano calcium carbonate is added for melt blending granulation to obtain the material.

The preparation method of the completely degradable kraft paper cushion air cushion is different from that of the embodiment 1 in that: in the absence of step 3 of example 1, the screw was not flushed with POE material containing 30% of 1500-mesh calcium carbonate, and the kraft paper was directly laminated with the fully degradable modifying material (inner layer material).

The applicant calculates the difference between the scrappage of the degradable material in the production process directly using the degradable material and the scrappage of the degradable material using the POE material as the start-up traction material in the comparative example 1 and the example 1, and the results are shown in Table 1.

TABLE 1

Case(s)	Starting up	Scrapping at startup	Time of setting	Production of	Speed of rotation
						Comparative example 1	Completely degradable material	200kg	2 hours	Completely degradable material	80-150m/min
Example 1	Flushing of POE materials	20kg	40 minutes	Completely degradable material	80-150m/min

The above experimental statistics show that the use of POE material as boot-strap can reduce boot-strap and boot-strap time.

Comparative example 2

The manufacturing method of the completely degradable kraft paper cushion air mattress is different from that of the embodiment 1 in that: and (4) performing 1-section corona treatment.

Example 2

The completely degradable kraft paper buffer air cushion is prepared by compounding completely degradable plastics and kraft paper materials by adopting a laminating process, and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the thickness of the inner layer is 20 micrometers, the material is modified PLA, the melt index of the PLA is 4g/10min (190 ℃/2.16 kg), the modifying agent is epoxidized soybean oil and needle-type nano calcium carbonate, the epoxidized soybean oil is firstly adopted to modify the PLA to obtain the material with the melt index of 9g/10min (190 ℃/2.16 kg), and then 2wt% of needle-type nano calcium carbonate is added to carry out melt blending granulation to obtain the PLA.

The preparation method of the completely degradable kraft paper cushion air cushion is different from that of the embodiment 1 in that: and (4) performing 3 sections of corona treatment.

The applicant performed the surface adhesion test of the inner degradable material and the outer kraft paper under the same parameters for the samples of the above example 1 and the comparative example, and the results are shown in the following table 2.

TABLE 2

Case(s)	Corona frequency setting	Speed of laminating	Temperature of laminating material	15mm sample peel test
					Comparative example 2	22HZ	100m/min	200℃	Peeling film from paper
Example 1	22HZ*2	100m/min	200℃	Paper tear
					Example 2	22HZ*3	100m/min	200℃	Paper tear

From the experimental data, after the two layers of corona are added, the surface adhesive force of the kraft paper and the laminating material is obviously increased, so that the surface roughness of the kraft paper can be obviously improved through the multiple sections of corona, and the surface adhesive force of the degradable material and the kraft paper is obviously improved under the same parameters.

Comparative example 4

The comparative example provides a buffer air cushion, which is prepared by compounding completely degradable plastic and kraft paper material by adopting a laminating process and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the thickness of the inner layer is 20 microns, the material is modified PLA, the melt index of the PLA is 4g/10min (190 ℃/2.16 kg), the modifying agent is epoxidized soybean oil and needle-shaped nano calcium carbonate, the materials are modified by the epoxidized soybean oil to obtain the material with the melt index of 9g/10min (190 ℃/2.16 kg), and then 2wt% of the needle-shaped nano calcium carbonate is added for melt blending granulation to obtain the material.

The gas storage device is provided with a calabash-shaped gas storage chamber, the width of a gas neck is 20mm, the size of a gas charging opening is 12mm, and the specific structure is shown in figure 2.

Comparative example 5

The small calabash-shaped gas storage chamber is provided with a small calabash-shaped gas storage chamber, the width of a gas neck is 15mm, the size of a gas charging port is 12mm, and the specific structure is shown in figure 2.

Comparative example 6

The air storage device is provided with four-row air storage chambers, the width of an air neck is 65mm, the size of an air charging port is 12mm, and the specific structure is shown in figure 3.

The applicant performed saturation and compression resistance tests on the air cushions in the above examples and comparative examples, and the saturation was obtained mainly by comparing the inflation cushion heights and compression resistances of different structures at the same air volume and speed. The results are shown in table 3 below:

TABLE 3

From the above experimental results, it can be seen that under the same inflation condition, only the new structure of the present application has the best saturation and the best performance of using the cushion.

Comparative example 7

The present comparative example provides a cushion air-cushion comprising a plurality of air storage cells 6 and air supply passages 1 formed by heat-sealing two air cushion films; the air supply channel 1 is provided with an inflation inlet 2; the top of the gas storage unit is provided with heat sealing rings 5, a gas inlet 2e is formed between every two adjacent heat sealing rings 5, and the gas supply channel 1 is connected with the gas storage unit 6 through the gas inlet 2 e; the gas storage unit 6 consists of a plurality of gas storage chambers 3, and the gas storage chambers 3 are connected through gas necks 4; the air storage chamber 3 has an S-shaped structure; the size of the air neck 4 is 50mm; the heat seal ring 5 extends towards the longitudinal direction to form a gas channel 2f; the width of the gas inlet 2e of the gas channel is 2cm.

The completely degradable kraft paper buffer air cushion is prepared by compounding completely degradable plastics and kraft paper materials by adopting a laminating process, and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the inner layer was 20 microns thick, the material was modified PLA with a melt index of 4g/10min (190 ℃/2.16 kg), the modifier was epoxidized soybean oil, which was modified with epoxidized soybean oil to give a material with a melt index of 9g/10min (190 ℃/2.16 kg), i.e., it was different from example 1 in that no needle-type calcium carbonate was used for modification in this comparative example. The preparation method of the completely degradable kraft paper cushion air cushion is the same as that of the embodiment 1.

Comparative example 8

The completely degradable kraft paper buffer air cushion is prepared by compounding completely degradable plastics and kraft paper materials by adopting a laminating process, and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the thickness of the inner layer is 20 microns, the material is modified PLA, the melt index of the PLA is 4g/10min (190 ℃/2.16 kg), the modifying agent is epoxidized soybean oil and 8000-mesh talcum powder, the epoxidized soybean oil is used for modifying the PLA to obtain a material with the melt index of 9g/10min (190 ℃/2.16 kg), then 2wt% of 8000-mesh talcum powder is added for melt blending granulation, and the difference between the modified PLA and the example 1 is that the same amount of 8000-mesh talcum powder is used for replacing needle type calcium carbonate for modifying the PLA. The preparation method of the completely degradable kraft paper cushion air cushion is the same as that of the embodiment 1.

Comparative example 9

The present comparative example provides a cushion air-cushion comprising a plurality of air storage cells 6 and an air supply passage 1 formed by heat-sealing two air cushion films; the air supply channel 1 is provided with an inflation inlet 2; the top of the gas storage unit is provided with heat sealing rings 5, a gas inlet 2e is formed between every two adjacent heat sealing rings 5, and the gas supply channel 1 is connected with the gas storage unit 6 through the gas inlet 2 e; the gas storage unit 6 consists of a plurality of gas storage chambers 3, and the gas storage chambers 3 are connected through gas necks 4; the air storage chamber 3 has an S-shaped structure; the size of the air neck 4 is 50mm; the heat seal ring 5 extends towards the longitudinal direction to form a gas channel 2f; the width of the gas inlet 2e of the gas channel is 2cm.

The completely degradable kraft paper buffer air cushion is prepared by compounding completely degradable plastics and kraft paper materials by adopting a laminating process, and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the thickness of the inner layer is 20 microns, the material is modified PLA, the melt index of the PLA is 4g/10min (190 ℃/2.16 kg), the modifying agent is epoxidized soybean oil and fumed silica, the modified PLA is modified by the epoxidized soybean oil to obtain the material with the melt index of 9g/10min (190 ℃/2.16 kg), then 2wt% of fumed silica is added for melt blending granulation, and the modified PLA is prepared, namely the modified PLA is different from the modified PLA in the embodiment 1 in that the same amount of fumed silica is used for replacing needle calcium carbonate for modification in the embodiment. The preparation method of the completely degradable kraft paper cushion air-cushion is the same as that of example 1.

Comparative example 10

The completely degradable kraft paper buffer air cushion is prepared by compounding completely degradable plastics and kraft paper materials by adopting a laminating process, and comprises an outer layer and an inner layer; the outer layer is made of kraft paper, the inner layer is made of completely degradable material, the grammage of the kraft paper of the outer layer is 26g, the thickness of the kraft paper is 4C (40 micrometers), and the content of needle pulp is 98%; the thickness of the inner layer is 20 microns, the material is modified PLA, the melt index of the PLA is 4g/10min (190 ℃/2.16 kg), the modifying agent is epoxidized soybean oil and 8000-mesh platy calcium carbonate, the PLA is modified by the epoxidized soybean oil to obtain a material with the melt index of 9g/10min (190 ℃/2.16 kg), then 2wt% of 8000-mesh platy calcium carbonate is added for melt blending granulation, and the PLA is prepared, namely the PLA is different from the PLA in example 1 in that the fumed silica is modified by replacing needle type calcium carbonate by the same amount of fumed silica in the comparative example. The preparation method of the completely degradable kraft paper cushion air-cushion is the same as that of example 1.

The applicant performed the tack-free crystallization time at 190 c and the machine direction tensile strength test on the cushion rubbers of the above examples and comparative examples, and the results thereof are shown in table 4 below.

TABLE 4

Case(s)	Material	Adding amount of	Surface dry crystallization time of 190 ℃	Longitudinal tensile strength
					Comparative example 7	Reference group without filler	0%	30s	20mpa
Comparative example 8	8000 mesh talcum powder	2%	25s	24mpa
					Comparative example 9	Fumed silica	2%	20s	28mpa
Example 1	Needle type nano calcium carbonate	2%	15s	34mpa
					Comparative example 10	8000 mesh flaky calcium carbonate	2%	23s	26mpa

From the experimental results, the needle-shaped nano calcium carbonate added with the needle-shaped nano calcium carbonate has the fastest surface drying crystallization speed and the most strength improvement.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content disclosed above into an equivalent embodiment with equivalent changes, but all those simple modifications, equivalent changes and modifications made on the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the present invention.

Claims

1. A totally degradable kraft paper buffer air cushion is characterized by comprising a plurality of air storage units (6) and an air supply channel (1), wherein the air storage units are formed by heat sealing of two air cushion films; an inflation inlet (2) is arranged on the air supply channel (1); the top of the gas storage unit is provided with heat sealing rings (5), a gas inlet (2 e) is formed between every two adjacent heat sealing rings (5), and the gas supply channel (1) is connected with the gas storage unit (6) through the gas inlet (2 e); the gas storage unit (6) consists of a plurality of gas storage chambers (3), and the gas storage chambers (3) are connected through gas necks (4); the air cushion film consists of an outer layer and an inner layer; the outer layer is made of kraft paper, and the inner layer is made of degradable materials; the outer layer and the inner layer are bonded through a laminating film;

the degradable material is modified by adopting a functional additive; the degradable material is PLA; the melt index of the PLA is 4g/10min under the condition of 190 ℃/2.16 kg; the functional assistant is epoxidized soybean oil;

the functional auxiliary agent also comprises 1 to 3wt% of needle-shaped nano calcium carbonate; the length range of the needle-shaped nano calcium carbonate is 8000-1500 micrometers, and the diameter of the needle-shaped nano calcium carbonate is 5~8 micrometers;

(2) Placing a kraft paper coiled material on a machine platform placing frame, drawing the kraft paper coiled material to a casting die head of a laminating machine through a traction wheel, and heating a traction roller, the casting die head and a screw rod;

(3) Adding the preparation raw materials of the inner layer into a laminating machine, laminating the surface of kraft paper on a machine stand, then pressing by a cooling pressing wheel, cutting and rolling to obtain the air cushion film;

2. The fully degradable kraft buffer cushion according to claim 1, wherein the air reservoir (3) has an S-shaped structure or a straight column structure.

3. The fully degradable kraft buffer cushion according to claim 2, wherein the size of the air neck (4) is not less than 45mm.

4. The fully degradable kraft paper cushion air as claimed in claim 3, wherein the size of the air neck is no more than 60mm.

5. The fully degradable kraft buffer cushion according to claim 1, wherein the heat seal ring (5) extends in a longitudinal direction forming a gas channel (2 f).

6. The fully degradable kraft buffer air cushion according to claim 5, wherein the width of the gas channel inlet (2 e) is 1 to 3cm.

7. The fully degradable kraft paper cushion air cushion as claimed in claim 1, wherein the thickness of the outer layer is 30 to 50 microns, and the thickness of the inner layer is 10 to 30 microns.

8. The fully degradable kraft buffer air cushion according to any one of claims 3~7, wherein the kraft paper is a multi-segmented corona treated kraft paper; the surface roughness of the kraft paper is not less than 2 μm.

9. The fully degradable kraft paper buffer air mattress according to claim 1, wherein the setting temperature of the laminating machine in the laminating process in step (3) is not higher than 140 ℃.