Abstract: The disclosure provides a smart heat sealing method for vacuum packaging, comprising steps of: recording a time interval ?t between two adjacent starts of a heating device which is continuously started a number of times; recording a number k of starts of the heating device; obtaining a first heating coefficient p1 based on ?t, obtaining a second heating coefficient p2 based on k, selecting the heating constant t depending on specified parameters and performance of the vacuum package machine, and calculating the heating time T for next operation of the heating device by a formula T=p1*p2*t based on p1, p2, and t. It solves the heat accumulation problem of the heating device caused by too much repeated use or overuse in short time interval, and thus avoids unsuccessful vacuuming and solves the problem of poor heat sealing effect, and greatly improves user experience.

Abstract: A vacuum packaging method and device are provided. The method comprises acquiring size information of a package and selecting a suction constant b; controlling a door to seal the vacuum chamber after the package is disposed into a vacuum chamber; actuating a vacuum pump set and starting timing, and respectively recording time nodes t1 and t2 when a pressure detected inside the vacuum chamber is lowered to a first preset pressure P1 and a second preset pressure P2; calculating time difference ?t by a formula ?t=t2?t1 based on t1 and t2; obtaining total suction time T or suction-stopping pressure P based on ?t and b; continuously performing suction by the vacuum pump set, and controlling the vacuum pump set to stop suction once a suction time reaches T or the pressure inside the vacuum chamber is lowered to P; controlling a heater to finish heat-sealing.

Abstract: The present disclosure relates to the technical field of packaging and discloses a packaging box including a box body, a reel, and a cutting device. The box body is provided with an accommodation cavity used for accommodating a vacuum bag roll, and is provided with a bag outlet; the reel is rotatably arranged in the box body, and is used for mounting the vacuum bag roll; the cutting device includes a cutting part which is slidably connected to the box body; a bag opening of the vacuum bag roll stretches out from the box body to the cutting part after passing through the bag outlet. The packaging box provided by the present disclosure is conducive to storage, transport, and cutting the vacuum bag rolls, meeting the requirements of the user for using vacuum bags.

Abstract: The disclosure provides a smart heat sealing method for vacuum packaging, comprising steps of: recording a time interval ?t between two adjacent starts of a heating device which is continuously started a number of times; recording a number k of starts of the heating device; obtaining a first heating coefficient p1 based on ?t, obtaining a second heating coefficient p2 based on k, selecting the heating constant t depending on specified parameters and performance of the vacuum package machine, and calculating the heating time T for next operation of the heating device by a formula T=p1*p2*t based on p1, p2, and t. It solves the heat accumulation problem of the heating device caused by too much repeated use or overuse in short time interval, and thus avoids unsuccessful vacuuming and solves the problem of poor heat sealing effect, and greatly improves user experience.

Abstract: The disclosure provides a multifunction vacuum package machine comprising a base and a top lid hingedly connected with each other. The top surface of the base defines a lower chamber, and the bottom surface of the top lid defines an upper chamber. The base is arranged with a heating system, a vacuum pump set, and a control system. The heating system includes a heater and a pressing strip. The heater is disposed on the base and placed outside the lower chamber, and the pressing strip is disposed on the top lid and placed outside the upper chamber. The vacuum pump set is in communication with the lower chamber via the suction opening provided on the wall of the lower chamber. The control system serves to control the heater and the vacuum pump set to perform heat-sealing and suction operations.

Abstract: A vacuum packaging method and device are provided. The method comprises acquiring size information of a package and selecting a suction constant b; controlling a door to seal the vacuum chamber after the package is disposed into a vacuum chamber; actuating a vacuum pump set and starting timing, and respectively recording time nodes t1 and t2 when a pressure detected inside the vacuum chamber is lowered to a first preset pressure P1 and a second preset pressure P2; calculating time difference ?t by a formula ?t=t2?t1 based on t1 and t2; obtaining total suction time T or suction-stopping pressure P based on ?t and b; continuously performing suction by the vacuum pump set, and controlling the vacuum pump set to stop suction once a suction time reaches T or the pressure inside the vacuum chamber is lowered to P; controlling a heater to finish heat-sealing.

Abstract: An integrated multifunctional vacuum cooking machine includes a cooking machine body, a heat conducting container, a vacuum pump set, a heating assembly, a temperature measuring assembly, and a control system. The cooking machine body includes a base and a top cover, a chamber recessed downward is formed in a top surface of the base, and the top cover is configured to open and close the chamber. The heat conducting container is disposed in the chamber, and defines a vacuum cavity with the top cover when the top cover closes the chamber. The vacuum pump set is communicated with the vacuum cavity. The heating assembly is configured to heat the vacuum cavity. The temperature measuring assembly is configured to measure a temperature of food materials. The control system is electrically connected to the vacuum pump set, the heating assembly, and the temperature measuring assembly.

Abstract: The present disclosure provides a plastic film, including: a film A and a film B, where a material of the film A includes at least one selected from the group consisting of polylactic acid (PLA), poly(butylene adipate-co-terephthalate) (PBAT), and poly(butylene succinate) (PBS); the film B includes a base layer and a coating layer, and the coating layer covers the base layer; the film A and the film B are laminated; and a material of the coating layer is polyvinylidene chloride (PVDC) and a material of the base layer is cellulose, or a material of the coating layer is aluminum oxide and a material of the base layer is PLA. It has been found that the plastic film has excellent water resistance, gas tightness, and mechanical performance, is biodegradable, and can be widely used in food packaging bags.

Abstract: Provided is a catalyst for synthesizing a polyethylene oxide polymer, comprising a crown ether as a first component, a quaternary phosphonium salt as a second component, and an alkali metal and/or an alkali metal compound as a third component. The catalyst can reduce the concentration of alkali metal ions in the product and is suitable for high-standard industrial fields. Also provided is a method for synthesizing a polyethylene oxide polymer, comprising carrying out a reaction of a compound containing active hydrogen and ethylene oxide in the presence of the catalyst. The method is simple to operate and environmentally friendly, improves the quality of the synthesized product, and is suitable for high-standard industrial production.

Abstract: The present disclosure relates to the technical field of packaging and discloses a packaging box including a box body, a reel, and a cutting device. The box body is provided with an accommodation cavity used for accommodating a vacuum bag roll, and is provided with a bag outlet; the reel is rotatably arranged in the box body, and is used for mounting the vacuum bag roll; the cutting device includes a cutting part which is slidably connected to the box body; a bag opening of the vacuum bag roll stretches out from the box body to the cutting part after passing through the bag outlet. The packaging box provided by the present disclosure is conducive to storage, transport, and cutting the vacuum bag rolls, meeting the requirements of the user for using vacuum bags.

Abstract: Provided is a novel vacuum packaging machine, comprising a machine body (1), a vacuum cover (2) and a bag hanging mechanism (3), wherein a vacuum chamber (11) enabling a packaging bag (4) to be vertically placed is provided in the machine body (1), the vacuum cover (2) is provided on the machine body (1) and corresponds to the vacuum chamber (11), and the bag hanging mechanism (3) is provided at the upper part of the vacuum chamber (11).

Abstract: Disclosed is a method for preparing propylene glycol phenyl ether, comprising carrying out a polymerization reaction of phenol and a propylene oxide in the presence of a quaternary phosphonium salt compound as a catalyst. Preferably, the method comprises mixing phenol and a quaternary phosphonium salt compound, and then adding propylene oxide under oxygen-free conditions, wherein the phenol is polymerized with the propylene oxide to produce the propylene glycol phenyl ether. The propylene glycol phenyl ether thus prepared has few impurities and contains no metal ions, such as potassium and sodium, and does not require subsequent operations to remove metal ions and perform rectification separation, thereby reducing the costs and allowing same to be directly applied to high-standard industrial production.

Abstract: Provided is a vacuum packaging machine (100), comprising a machine body (1), a vacuum cover (2), a main controller (3), a sub-controller (4), a heat-sealing mechanism (5) and a vacuumizing mechanism (6), wherein a vacuum chamber (11) is provided in the machine body, the vacuum cover covers the machine body and corresponds to the position of the vacuum chamber; the main controller is provided on the machine body, the sub-controller is provided on the vacuum cover, and the main controller is in communication connection with the sub-controller; and the main controller is in communication connection with the heat-sealing mechanism and the vacuumizing mechanism, and functional keys (40) used for implementing vacuumizing and heat-sealing operations are provided on the sub-controller.

Abstract: Provided is a vacuum packaging machine (100), comprising a machine body (1), a vacuum cover (2), a main controller (3), a sub-controller (4), a heat-sealing mechanism (5) and a vacuumizing mechanism (6), wherein a vacuum chamber (11) is provided in the machine body, the vacuum cover covers the machine body and corresponds to the position of the vacuum chamber; the main controller is provided on the machine body, the sub-controller is provided on the vacuum cover, and the main controller is in communication connection with the sub-controller; and the main controller is in communication connection with the heat-sealing mechanism and the vacuumizing mechanism, and functional keys (40) used for implementing vacuumizing and heat-sealing operations are provided on the sub-controller.

Abstract: Provided is a novel vacuum packaging machine, comprising a machine body (1), a vacuum cover (2) and a bag hanging mechanism (3), wherein a vacuum chamber (11) enabling a packaging bag (4) to be vertically placed is provided in the machine body (1), the vacuum cover (2) is provided on the machine body (1) and corresponds to the vacuum chamber (11), and the bag hanging mechanism (3) is provided at the upper part of the vacuum chamber (11).

Abstract: Provided is a catalyst for synthesizing a polyethylene oxide polymer, comprising a crown ether as a first component, a quaternary phosphonium salt as a second component, and an alkali metal and/or an alkali metal compound as a third component. The catalyst can reduce the concentration of alkali metal ions in the product and is suitable for high-standard industrial fields. Also provided is a method for synthesizing a polyethylene oxide polymer, comprising carrying out a reaction of a compound containing active hydrogen and ethylene oxide in the presence of the catalyst. The method is simple to operate and environmentally friendly, improves the quality of the synthesized product, and is suitable for high-standard industrial production.

Abstract: Disclosed is a method for preparing propylene glycol phenyl ether, comprising carrying out a polymerization reaction of phenol and a propylene oxide in the presence of a quaternary phosphonium salt compound as a catalyst. Preferably, the method comprises mixing phenol and a quaternary phosphonium salt compound, and then adding propylene oxide under oxygen-free conditions, wherein the phenol is polymerized with the propylene oxide to produce the propylene glycol phenyl ether. The propylene glycol phenyl ether thus prepared has few impurities and contains no metal ions, such as potassium and sodium, and does not require subsequent operations to remove metal ions and perform rectification separation, thereby reducing the costs and allowing same to be directly applied to high-standard industrial production.

Abstract: The plastic bag for vacuum packing provided by the present invention has embossments which space in longitudinal direction and stagger in transverse direction formed on the inner surface, and thus lots of intercommunicate channels are formed so as to eliminate the possibility to form any air pocket or internal cavity. Meanwhile, air linearly exits from the bottom to the open end, so it takes less time to evacuate the bag. Further, the bag only has one film be embossed, and thus the manufacturing process thereof is simplified and at low cost, and the bag is easy to wash. Moreover, the strength of the bag provided by the present invention is enhanced; especially the anti-avulsion capability is well improved.

Abstract: The plastic bag for vacuum packing provided by the present invention has embossments which space in longitudinal direction and stagger in transverse direction formed on the inner surface, and thus lots of intercommunicate channels are formed so as to eliminate the possibility to form any air pocket or internal cavity. Meanwhile, air linearly exits from the bottom to the open end, so it takes less time to evacuate the bag. Further, the bag only has one film be embossed, and thus the manufacturing process thereof is simplified and at low cost, and the bag is easy to wash. Moreover, the strength of the bag provided by the present invention is enhanced; especially the anti-avulsion capability is well improved.