Production process of environment-friendly food packaging film
阅读说明：本技术 一种环保型食物包装膜的生产工艺 (Production process of environment-friendly food packaging film ) 是由 武道贵 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种环保型食物包装膜的生产工艺,涉及包装膜技术领域。该环保型食物包装膜的生产工艺,包括辅助装置和模具,所述辅助装置包括外框架,所述外框架上设置有内框架,所述外框架上通过伸缩杆固定连接有加压机构,所述加压机构的底部设置有压力传感器。该环保型食物包装膜的生产工艺,通过生产时设置内置凹槽,从而增加了层之间的贴合面积,同时在内置凹槽内设置环氧树脂粉末进一步增加了不同层之间的黏合性,避免了不同层之间的散架,并在聚乙烯层和聚氯乙烯和聚丙乙烯混合层之间加设聚羟基脂肪酸脂层,在限制聚羟基脂肪酸脂使用量的同时很好的保证了分解速率,从而实现在保证成本的前提下降低环境分解的负担。(The invention discloses a production process of an environment-friendly food packaging film, and relates to the technical field of packaging films. This production technology of environment-friendly food packaging film, including auxiliary device and mould, auxiliary device includes outer frame, be provided with the inner frame on the outer frame, through telescopic link fixedly connected with loading mechanism on the outer frame, loading mechanism's bottom is provided with pressure sensor. This production technology of environment-friendly food packaging film, set up built-in recess during through production, thereby the laminating area between the layer has been increased, set up the epoxy powder in built-in recess simultaneously and further increased the cohesiveness between the different layers, the frame that looses between the different layers has been avoided, and set up the polyhydroxyalkanoate layer in addition between polyethylene layer and polyvinyl chloride and the mixed layer of polypropylene ethylene, fine assurance decomposition rate when restriction polyhydroxyalkanoate use amount, thereby the burden of environment decomposition is reduced in the prerequisite of cost guarantee to the realization.)
1. The production process of the environment-friendly food packaging film is characterized by comprising the following steps: including auxiliary device and mould, auxiliary device includes outer frame (1), be provided with internal frame (2) on outer frame (1), go up through telescopic link (3) fixedly connected with loading system (4) on outer frame (1), the bottom of loading system (4) is provided with pressure sensor (5), pressure sensor (5) are rectangular array and distribute in the bottom of loading system (4), and the distance of per two adjacent pressure sensor (5) is 3cm, the sense terminal fixedly connected with pressure bar (6) of pressure sensor (5), the bottom of pressure bar (6) is inlayed and is had metal ball (7), the top of internal frame (2) is provided with pulley (8), the mould includes side frame (9), be provided with on side frame (9) hot plate (10), an upper shed rectangle box body is constituteed with side frame (9) hot plate (10), the specific operation steps are as follows:
S1, keeping the mould horizontal relative to the horizontal plane, heating the polyethylene to 135 ℃, adding the polyethylene into the mould after the polyethylene is changed into a molten state, gradually reducing the temperature of the polyethylene through a heating plate (10), and finally keeping the temperature of the heating plate (10) constant at 90 ℃, so that the polyethylene is changed into a softened polyethylene layer;
s2, placing the mold on the inner frame (2), then controlling the telescopic rod (3) to perform an extending operation, so that the metal balls (7) exert pressure on the softened polyethylene layer, and stopping the extending operation of the telescopic rod (3) when the average pressure value detected by the pressure sensor (5) is 150-200 Pa;
s3, moving the mold back and forth relative to the inner frame (2) while keeping the pressure mean value detected by the pressure sensor (5) at 150-200Pa, so that the metal ball (7) moves on the softened polyethylene layer to form the built-in groove (12), wherein the length of the built-in groove (12) is 3-5 cm;
s4, controlling the telescopic rod (3) to reset, ensuring that the metal ball (7) is located at an initial position during resetting, taking down the die, adding epoxy resin powder into the built-in groove (12), and filling 50-70% of bisphenol A type epoxy resin powder into the inner cavity of the built-in groove (12);
s5, keeping the mould horizontal relative to the horizontal plane, heating the polyhydroxyalkanoate to 150 ℃, adding the polyhydroxyalkanoate into the mould, cutting off the power supply of the heating plate (10), waiting for 10-15min in an indoor environment, applying pressure to the polyhydroxyalkanoate, wherein the pressure is 1-1.5kPa, and keeping for 5 min;
S6, mixing polyvinyl chloride and polypropylene according to the weight ratio of 3: 5 is heated to 165 ℃ and mixed for 30min, then the mixture is added into a mould, and pressure is applied after the surface temperature of the mixture is reduced to 30-60 ℃, wherein the pressure is 1-1.5kPa and lasts for 10 min;
and S7, taking out the finished product in the mold, thereby finishing the manufacturing of the packaging film.
2. The production process of the environment-friendly food packaging film as claimed in claim 1, wherein: in step S1, polyethylene is added when the temperature of the heating plate (10) is 135 ℃, and the temperature of the heating plate (10) is uniformly reduced to 90 ℃ within 10-15 min.
3. The production process of the environment-friendly food packaging film as claimed in claim 1, wherein: in step S4, the epoxy resin powder is bisphenol a type epoxy resin powder.
4. The production process of the environment-friendly food packaging film as claimed in claim 1, wherein: the mass ratio of the polyethylene to the epoxy resin powder to the polyhydroxy fatty acid ester to the polyvinyl chloride to the polypropylene is 10: 5: 8: 3: 5.
Technical Field
The invention relates to the technical field of packaging films, in particular to a production process of an environment-friendly food packaging film.
Background
The packaging film is mainly formed by the mixed extrusion of several kinds of different grades of polyethylene resin, has anti puncture, and super strength high performance twines the packing to the goods of stacking on the layer board, makes the packing material more firm clean and tidy, and superstrong waterproof effect is widely used, in foreign trade export, papermaking, five metals, plastics chemical industry, building materials, food and medicine trade.
In the prior art, the production operation of the packaging film is performed by simply heating and laminating only one material or a plurality of materials (since the thickness of the packaging film is small, the packaging film cannot be laminated by using an adhesive as an intermediate, and only a heating and laminating method can be used), if a single material is used, it is difficult to satisfy the requirements of users on a plurality of performances (environmental protection, heat insulation, stretch resistance and light transmittance), if a plurality of materials are used for simply heating and laminating, the packaging film is easy to be scattered, and if the packaging film is discarded and decomposed, gaps do not exist between different layers, and only the packaging film can be decomposed by anaerobic microorganisms (although the prior art has an environment-friendly packaging film made of polyhydroxyalkanoates as materials, but the polyhydroxyalkanoates are expensive in cost, and if the film materials are polyhydroxyalkanoates, this leads to a linear increase in the cost of the packaging film), reduces the rate of decomposition of the packaging film, and places a certain burden on the environment.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a production process of an environment-friendly food packaging film, which solves the problems that in the prior art, the production operation of the packaging film is carried out by simply heating and laminating only one material or a plurality of materials (because the thickness of the packaging film is smaller, different materials cannot be laminated by using an adhesive as an intermediate, and only a heating and laminating mode can be used), if a single material is used, the requirements of a user on a plurality of performances (environmental protection, heat insulation, tensile resistance and light transmittance) are difficult to be simultaneously met, if a plurality of materials are used for simply heating and laminating, the scattering of the packaging film is easy to appear, and meanwhile, when the packaging film is discarded and decomposed, gaps do not exist between different layers, and only the packaging film can be decomposed by anaerobic microorganisms (although the environment-friendly packaging film made of polyhydroxyalkanoates as materials exists in the prior art, however, the polyhydroxyalkanoates are expensive in cost, and if the film materials are polyhydroxyalkanoates, the cost of the packaging film is increased linearly), the decomposition rate of the packaging film is reduced, and a certain degree of burden is brought to the environment.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a production technology of environment-friendly food packaging film, includes auxiliary device and mould, auxiliary device includes outer frame, be provided with the internal frame on the outer frame, go up through telescopic link fixedly connected with loading system on the outer frame, loading system's bottom is provided with pressure sensor, pressure sensor is rectangular array and distributes in loading system's bottom, and per two adjacent pressure sensor's distance is 3cm, pressure sensor's sense terminal fixedly connected with pressure bar, the bottom of pressure bar is inlayed and is had metal ball, the top of internal frame is provided with the pulley, the mould includes the side frame, be provided with the hot plate on the side frame, an upper shed rectangle box body is constituteed to hot plate and side frame, and concrete operating procedure is as follows:
s1, keeping the mold horizontal relative to the horizontal plane, heating the polyethylene to 135 ℃, adding the polyethylene into the mold after the polyethylene is in a molten state, gradually reducing the temperature of the polyethylene through a heating plate, and finally keeping the temperature of the heating plate constant at 90 ℃ so as to enable the polyethylene to be changed into a softened polyethylene layer;
S2, placing the mold on the inner frame, then controlling the telescopic rod to perform an extension operation, so that the metal balls exert pressure on the softened polyethylene layer, and stopping the extension operation of the telescopic rod when the average pressure value detected by the pressure sensor is 150-200 Pa;
s3, moving the mold back and forth relative to the inner frame, and simultaneously keeping the average pressure value detected by the pressure sensor to be 150-200Pa, so that the metal ball moves on the softened polyethylene layer to form a built-in groove, wherein the length of the built-in groove is 3-5 cm;
s4, controlling the telescopic rod to reset, wherein during resetting, the metal ball is required to be positioned at an initial position, taking the die down, adding epoxy resin powder into the built-in groove, and filling 50-70% of bisphenol A type epoxy resin powder into the inner cavity part of the built-in groove;
s5, keeping the mould horizontal relative to the horizontal plane, heating the polyhydroxyalkanoate to 150 ℃, adding the polyhydroxyalkanoate into the mould, cutting off the power supply of the heating plate, waiting for 10-15min in an indoor environment, applying pressure to the polyhydroxyalkanoate, wherein the pressure is 1-1.5kPa, and keeping for 5 min;
s6, mixing polyvinyl chloride and polypropylene according to the weight ratio of 3: 5 is heated to 165 ℃ and mixed for 30min, then the mixture is added into a mould, and pressure is applied after the surface temperature of the mixture is reduced to 30-60 ℃, wherein the pressure is 1-1.5kPa and lasts for 10 min;
And S7, taking out the finished product in the mold, thereby finishing the manufacturing of the packaging film.
Preferably, in step S1, polyethylene is added when the temperature of the heating plate is 135 ℃, and the temperature of the heating plate is uniformly reduced to 90 ℃ within 10-15 min.
Preferably, in step S4, the epoxy resin powder is bisphenol a type epoxy resin powder.
Preferably, the mass ratio of the polyethylene to the epoxy resin powder to the polyhydroxyalkanoate, the polyvinyl chloride to the polypropylene is 10: 5: 8: 3: 5.
(III) advantageous effects
The invention provides a production process of an environment-friendly food packaging film. The method has the following beneficial effects: the production process of the environment-friendly food packaging film comprises the steps of arranging the built-in groove during production, so that the bonding area between layers is increased, arranging the epoxy resin powder in the built-in groove, further increasing the adhesiveness between different layers, avoiding the scattering between different layers, additionally arranging the polyhydroxy fatty acid ester layer between the polyethylene layer and the polyvinyl chloride and polypropylene mixed layer, ensuring that various properties of the packaging film meet requirements, preferentially decomposing the polyhydroxy fatty acid ester layer after the packaging film is discarded, separating the polyethylene layer from the polyvinyl chloride and polypropylene mixed layer, simultaneously enabling heterotrophic microorganisms to participate in the decomposition of the packaging film by air in the built-in groove, and increasing the decomposition area of the packaging film after the polyhydroxy fatty acid ester layer is decomposed (only two sides are decomposition surfaces originally, and the polyethylene layer, the polyvinyl chloride and polypropylene mixed layer respectively have two decomposition surfaces after the polyhydroxy fatty acid ester layer is decomposed), thereby further increasing the decomposition speed, well ensuring the decomposition rate while limiting the use amount of the polyhydroxy fatty acid ester, and reducing the burden of environmental decomposition on the premise of ensuring the cost.
Drawings
FIG. 1 is a schematic view of the auxiliary device of the present invention;
FIG. 2 is a bottom view of the pressurization mechanism of the present invention;
FIG. 3 is a schematic structural view of the mold of the present invention;
fig. 4 is a schematic view of the position of the built-in groove and the initial position of the metal ball according to the present invention.
In the figure: 1. an outer frame; 2. an inner frame; 3. a telescopic rod; 4. a pressurizing mechanism; 5. a pressure sensor; 6. a pressurizing rod; 7. a metal ball; 8. a pulley; 9. a side frame; 10. heating plates; 11. a polyethylene layer; 12. a groove is arranged inside.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
Referring to fig. 1-4, the present invention provides a technical solution: the production process of the environment-friendly food packaging film comprises an auxiliary device and a die, wherein the auxiliary device comprises an
S1, keeping the mold horizontal relative to a horizontal plane, heating polyethylene to 135 ℃, adding the polyethylene into the mold after the polyethylene is in a molten state, gradually reducing the temperature of the polyethylene through a heating plate 10, and finally keeping the temperature of the heating plate 10 constant at 90 ℃ so as to enable the polyethylene to be changed into a softened polyethylene layer, wherein the polyethylene is added when the temperature of the heating plate 10 is 135 ℃, and the temperature of the heating plate 10 is reduced to 90 ℃ at a constant speed within 10-15 min;
s2, placing a mold on the
s3, moving the mold back and forth relative to the
s4, controlling the
S5, keeping the mould horizontal relative to the horizontal plane, heating the polyhydroxyalkanoate to 150 ℃, adding the polyhydroxyalkanoate into the mould, cutting off the power supply of the heating plate 10, waiting for 10-15min in an indoor environment, applying pressure to the polyhydroxyalkanoate, wherein the pressure is 1-1.5kPa, and keeping for 5 min;
s6, mixing polyvinyl chloride and polypropylene according to the weight ratio of 3: 5 is heated to 165 ℃ and mixed for 30min, then the mixture is added into a mould, and pressure is applied after the surface temperature of the mixture is reduced to 30-60 ℃, wherein the pressure is 1-1.5kPa and lasts for 10 min;
s7, taking out the finished product in the die, and finishing the manufacturing of the packaging film, wherein the mass ratio of the polyethylene, the epoxy resin powder, the polyhydroxy fatty acid ester, the polyvinyl chloride and the polypropylene is 10: 5: 8: 3: 5.