CN112550922A

CN112550922A - Energy-saving lunch box easy to recycle and preparation process thereof

Info

Publication number: CN112550922A
Application number: CN202011333653.3A
Authority: CN
Inventors: 郑齐兵
Original assignee: Wuhan Yingguang Packaging Co ltd
Current assignee: Wuhan Yingguang Packaging Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-03-26

Abstract

The invention discloses an easily-recycled energy-saving lunch box and a preparation process thereof, and relates to the technical field of food packaging boxes. The invention carries out corona treatment on the surface layer of the high polymer sheet, then coats HDPE or PLA film on the corona surface of the high polymer sheet through a film laminating machine, and forms the energy-saving lunch box after vacuum pumping, plastic sucking and hot pressing of a cavity in a mould. The box body is attached with a layer of easy-to-tear film, and the easy-to-tear film can be torn off after being used and can be used for the second time, so that the box is clean and sanitary, and has the effects of energy conservation and consumption reduction. If do not carry out the secondary and use, the cutlery box after the use gets into the categorised link of retrieving of rubbish, then only needs manual work or manipulator to tear easily tear the membrane, need not crushing treatment, the direct granulation that cleaning and disinfecting can get into industrial field, cyclic utilization, the easy membrane that tears of PLA material can get into the nature degradation in addition.

Description

Energy-saving lunch box easy to recycle and preparation process thereof

Technical Field

The invention relates to the technical field of food packaging boxes, in particular to an energy-saving lunch box easy to recycle and a preparation process thereof.

Background

In modern society, catering industry, takeaway and food distribution system develop rapidly, which results in that plastic meal boxes are frequently used, and the manufacturing and using processes of the plastic meal boxes consume a large amount of petrochemical energy. The traditional plastic lunch box becomes dry and wet and is not easy to sort and separate garbage after being used, and the garbage can not be recycled or the recycling value is too low, thereby further polluting the environment. With the current enormous market consumption, purely biodegradable materials and synthetic degradable materials with added plastics have emerged and been used in lunch boxes. The cost of pure biodegradable materials is high, and most of the materials cannot be used by microwaves, for example, the cost increased by the microwaves is higher; after the synthetic degradable material is degraded, plastic particles still scatter and are abandoned in the nature, the manufacturing and sorting (plastic and degradable material are applied to the lunch box in the coming years) cost is greatly increased, and the problem of environmental pollution is still not fundamentally solved. The two materials can not realize good purposes of green energy conservation, consumption reduction and emission reduction.

In addition, the plastic lunch boxes used for fast food elimination are almost disposable, and cannot be reused after being cleaned like metal, glass and ceramic tableware, so that the use purpose of convenience and sanitation is difficult to meet.

Therefore, from the perspective of increasing the use times of the lunch box and recycling value of the lunch box with food residue and oil stain after use, a novel lunch box and a preparation process thereof need to be researched, the use times of the lunch box are increased, the nondegradable plastic lunch box is prevented from being buried, abandoned or burned to the maximum extent, the purposes of economy, environmental protection and emission reduction are achieved, and feasible technical support is provided for truly landing the key elements of easy recycling and recycling in the national plastic limit policy.

Disclosure of Invention

The invention aims to provide an energy-saving lunch box which is easy to recycle and can be recycled and a preparation process thereof, so as to solve the problem that the existing lunch box can not be used for many times and achieve the purposes of saving energy, reducing consumption and relieving environmental pressure.

In order to achieve the purpose, the invention provides an energy-saving lunch box which is easy to recycle and can be recycled, comprising a lunch box body and an easy-to-tear film, wherein the easy-to-tear film is attached to the inner surface of the lunch box body, and the corners of the lunch box body are provided with easy-to-tear finger positions for tearing off the easy-to-tear film.

Furthermore, the attaching surfaces of the lunch box body and the easy-to-tear film are both subjected to corona treatment.

Furthermore, the easy-to-tear film and the lunch box body are attached in a co-extrusion mode.

Further, the easy-tear film is a HDPE or PLA film.

Further, the thickness of the easy-tear film is 0.05 mm.

Further, the material of the lunch box body is one or more of high-barrier sheets of EVOH, polypropylene, polystyrene and polyester.

Furthermore, the energy-saving lunch box also comprises a lunch box cover which has the same structure and material as the lunch box body and is adaptive to the lunch box body in size.

Furthermore, the energy-saving lunch box and the lunch box body are the same in structure and material and are matched in size.

Another object of the present invention is to provide a preparation process of the above energy-saving lunch box, which is characterized by comprising the following steps:

1. respectively carrying out corona treatment on the surface layers of the polymer sheet and the film;

2. the corona surface of the sheet and the corona surface of the film are coated and co-extruded to form a composite sheet;

3. and (4) obtaining the energy-saving lunch box after film coating through vacuumizing and hot-press molding of the inner die cavity.

The invention also aims to provide application of the preparation process in preparing energy-saving food packaging containers.

The invention has the technical effects and advantages that:

1. the using surface of the lunch box provided by the invention is adhered with a layer of synthetic easy-to-tear food-grade HDPE film or PLA degradable film, when the food in the lunch box is eaten, the layer of environment-friendly film can be torn off, the lunch box can be reused for the second time, and is clean and sanitary, and better energy-saving and consumption-reducing effects are achieved while the using times are improved;

2. if the lunch box provided by the invention is not reused for two times, after eating, the lunch box enters a garbage classification and recovery link, the surface film of the finger position part of the box body is torn by only manpower or by using an equipment manipulator, the lunch box can enter the crushing treatment, direct granulation and high-temperature calendering and extrusion of the industrial field without cleaning and disinfection, the lunch box can be recycled in a multi-layer co-extruded middle layer or a non-direct contact food layer, and a series of socialized manpower such as chemical washing, physical precipitation, drying, sterilization and the like and other post-processing cost are saved to the maximum extent;

3. the preparation process of the lunch box provided by the invention adopts corona treatment to increase the adhesive force; in addition, a closely attached film coating layer is obtained through co-extrusion and in-mold cavity vacuumizing and hot pressing, and meanwhile, the film coating layer is convenient to tear, so that the reliability of surface film coating is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of a lunch box cover structure of an energy-saving lunch box easy to recycle according to the present invention.

Fig. 2 is a schematic cross-sectional view of the lunch box body structure of the easily recyclable and energy-saving lunch box provided by the invention.

In the figure, 1: lunch box cover, 2: easy-to-tear film; 3: the finger position is easy to tear; 4: cutlery box body.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, the invention provides an energy-saving lunch box easy to recycle, which comprises a lunch box body 4 and a lunch box cover 1. The easy-to-tear film 2 is adhered to the inner use surfaces of the lunch box body 4 and the lunch box cover 1, and the lunch box body 4 and the lunch box cover 1 are buckled and sealed.

Furthermore, the edge of the lunch box body 4 and the lunch box cover 1 is provided with an easy-tearing finger position 3, so that the adhered easy-tearing film can be uncovered from the finger position when in use. As shown in figure 1, the surface of the lunch box cover 1 is pasted with a layer of easy-to-tear film 2, the easy-to-tear film 2 is pasted on the surface of the whole lunch box cover 1, and the edge of the easy-to-tear film is provided with an easy-to-tear finger position 3 which is preferably arranged at the corner. Moreover, the easy-to-tear lines are clear, and the easy-to-tear film does not need to be peeled off by a sharp tool, so that the soup is prevented from remaining in the box body after the film is torn.

Fig. 2 shows a schematic view of the lunch box body 4, and a layer of easy-to-tear film 2 is also attached to the inner surface of the lunch box body 4, and the easy-to-tear film 2 is attached to the inner surface of the whole lunch box body 4, and easy-to-tear finger positions 3 (not shown in the figure) are arranged at the edges, preferably at the corners.

In the present invention, the easy-to-tear film 2 can be selected from HDPE film (crystallinity 80-90%, softening point 125-. The product is easy to be synchronously formed with a hard film sheet, and the finished product is resistant to microwave heating; the wear resistance and the toughness are good, the tableware is not easy to scratch, and no soup residue is left on the surface of the box body after the film is torn.

In the invention, the lunch box body 4 and the lunch box cover 1 can be made of one or more of high-barrier EVOH sheet, polypropylene, polystyrene and polyester.

In the invention, the arrangement position of the easy-tearing finger position 3 avoids the soup leakage of the lunch box in the processes of refrigeration, microwave and transportation, and the lunch box can not pollute the other surface which is not covered with the film.

In the energy-saving lunch box provided by the invention, the lunch box body 4 and the lunch box cover 1 can be buckled and sealed. In addition, can also set up support or other box bodys in the cutlery box according to practical application, have the structure of above-mentioned tectorial membrane equally to can tear the easy dyestripping that the surface pasted from easily tearing finger position.

When the easily-torn film is manufactured, the attractive appearance in use is considered, soup leakage is guaranteed, the easily-torn film is convenient to tear, the easily-torn film and the sheet are required to be well attached, an adhesive cannot be used, the easily-torn film can be easily torn off integrally and cannot be left, and the film and the sheet cannot be well separated and are easy to tear due to the adhesive used in film covering of the easily-torn film and the sheet.

Therefore, the invention adopts a mode of carrying out corona treatment on the surface of the sheet and the film to enhance the adhesive force, and a mode of co-extruding the corona surface by a film laminating machine to realize the structure of the easy-to-tear film attaching sheet. The principle is as follows:

high frequency and high voltage electricity is applied to the processing device to cause corona discharge, and fine and dense purplish blue sparks are generated. Various plasmas generated after air ionization are accelerated to impact the soft film and the hard film in the treatment device under the action of a strong electric field, the energy of plasma particles is generally several to dozens of electron volts and is close to the chemical bond energy of the soft and hard film plastic molecules, and therefore, the chemical bond of the soft and hard film plastic surface molecules can be induced to break and degrade, and the surface roughness is increased. During corona discharge, a large amount of ozone is also generated. Ozone is a strong oxidizing agent that oxidizes molecules of the surface of the soft and hard films to produce carbonyl compounds, peroxy compounds, and the like. In addition, the corona treatment also has the function of removing oil stain, water vapor, dust and dirt, and the like, and the wettability and the adhesiveness of the surfaces of the soft film and the hard film are fully improved after the physical and chemical modification.

The laminating machine is adopted for coextrusion, so that the laminating consistency can be kept better with the sheet body, and the automation and the scale production are facilitated.

The following will describe in detail a process for manufacturing an energy-saving lunch box which is easy to recycle and can be recycled according to the present invention with reference to specific embodiments.

1. Carrying out corona treatment on a soft film (HDPE film or PLA degradable film) and a hard film (polypropylene PP, polystyrene PS, polyester PET sheet and composite EVOH sheet co-extruded by multiple layers of the polypropylene PP, the polystyrene PS and the polyester PET sheet), wherein the corona process is as follows: high-frequency high-voltage electricity (5000-²) Corona discharge is carried out to generate fine and dense violet-blue sparks;

2. coating the corona surfaces of the hard film sheet and the soft film by a film coating machine, wherein common film coating machines sold in the market can be selected for coating;

3. the forming is carried out by adopting the vacuum-pumping plastic-absorbing hot-pressing technology of the inner die cavity: and (3) putting the film-coated sheet into a forming die, heating the film-coated surface, exhausting air from the reverse side to form vacuum, and finishing the forming process when the film-coated sheet deforms and is consistent with the die.

The energy-saving lunch box disclosed by the invention has a structure that the use layer is pasted with the easy-to-tear film, and can be prepared by adopting a vacuum thermal forming production process after the film is covered. Energy-saving lunch boxes (some products additionally have a middle support) refer to containers for holding food, and include, but are not limited to, trays, lunch boxes, packing boxes, fruit cutting boxes, salad boxes, cooking and roasting boxes, sauce/seasoning boxes, cooked food boxes, semi-finished food boxes, meat fresh-keeping boxes, aquatic frozen product packaging boxes, and cake western-style pastry boxes.

According to the invention, through carrying out corona treatment on the surfaces of polypropylene PP, polystyrene PS and polyester PET sheets and multi-layer co-extruded composite sheets thereof, or high-barrier sheets added with EVOH, the adhesion force of the sheets is increased, then a high-density high-fire-microwave-resistant synthetic polyethylene HDPE film with extremely strong co-extrusion plasticity is coated outside the surfaces of the sheets contacting with food through a film laminating machine, after vacuumizing and hot pressing through an in-mold cavity, the whole lunch box capable of being used repeatedly is formed, a layer of synthetic easy-tearing food-grade HDPE coating film or PLA degradable film is attached to the upper surface of the box body, after the food in the lunch box is eaten, the layer of environment-friendly coating film can be torn off, the lunch box can be reused for two times, and is clean and sanitary, and better effects of energy conservation, consumption reduction and emission reduction are achieved while; if the food box is not reused for the second time, the food box enters a garbage classification and recovery link after being eaten, the surface film of the finger position part of the box body is torn by only manpower or by using an equipment manipulator, the food box can enter the crushing treatment, direct granulation and high-temperature calendering of the industrial field without cleaning and disinfection, and can be recycled in a multi-layer co-extruded middle layer or a non-direct contact food layer at the part with the thickness and weight of 90 percent of the box body base material, so that a series of socialized manpower and other post-processing cost are saved to the maximum extent. An economical and environment-friendly energy-saving and emission-reducing method is found, and technical and application level destruction is carried out in the bottleneck field of the national plastic-limiting policy.

The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims

1. The utility model provides an easily retrieve energy-conserving cutlery box of circulated utilization, includes the cutlery box body, its characterized in that still includes easily tear the membrane, easily tear the membrane and paste and cover at the internal surface of cutlery box body, the corner of cutlery box body is equipped with the finger position of easily tearing of tearing easily tear the membrane.

2. An energy saving lunch box as claimed in claim 1, wherein the surfaces of the box body and the easy-to-tear film are corona treated.

3. The energy saving lunch box of claim 1, wherein the easy-tear film is attached to the box body by co-extrusion.

4. The energy saving lunch box of claim 1, wherein the easy-tear film is a HDPE or PLA film.

5. An energy saving lunch box according to claim 1, wherein the thickness of said tearable film is 0.05 mm.

6. The lunch box body is made of one or more of high-barrier sheet material added with EVOH, polypropylene, polystyrene and polyester.

7. An energy saving lunch box as claimed in claim 1, further comprising a lunch box cover of the same structure and material as the lunch box body and of a size suitable for the lunch box body.

8. An energy saving lunch box as claimed in claim 1, further comprising a lunch box middle support which has the same structure and material as the lunch box body and is adaptive to the size.

9. A process for preparing an energy-saving lunch box as claimed in claim 1, which comprises the following steps:

s1, respectively carrying out corona treatment on the polymer sheet and the surface layer of the film;

s2, pasting and co-extruding the corona surface of the sheet and the corona surface of the film to form a composite sheet;

and S3, obtaining the energy-saving lunch box after film coating through vacuum-pumping hot-press molding of the inner die cavity.

10. Use of the process of claim 9 for the preparation of energy efficient food packaging containers.