CN217098882U

CN217098882U - One-time crystallization mold in PLA film

Info

Publication number: CN217098882U
Application number: CN202220184860.5U
Authority: CN
Inventors: 刘志仁
Original assignee: Dongguan Sichun Plastic Products Co ltd
Current assignee: Dongguan Sichun Plastic Products Co ltd
Priority date: 2022-01-22
Filing date: 2022-01-22
Publication date: 2022-08-02
Anticipated expiration: 2032-01-22

Abstract

The utility model discloses a crystallization mould in PLA membrane, include: a forming die core layer and a refrigerating layer; wherein: the forming die core layer is provided with: a plurality of molding cavities and corner grooves for independently separating the molding cavities; a heating oil path for heating and keeping the temperature of the forming die core layer constant is preset in the forming die core layer; a plastic suction gas circuit for realizing plastic suction processing and a gas hole arranged in the forming cavity are also arranged in the forming mold core layer; the refrigerating layer is provided with refrigerating layer wall vacant sites with the same positions and quantity as the cavity positions in the forming die core layer; the refrigeration water route that is used for going on refrigerating and cooling to the refrigeration layer is preset in the refrigeration layer, realizes once only that PLA dinner plate adds man-hour, under the condition that makes the crystallization can not appear in recoverable leftover bits, realizes once plastics sucking crystallization processing in the mould of PLA dinner plate, and then reduces secondary operation, improves the efficiency and the reduction in production cost of processing.

Description

One-time crystallization mold in PLA film

Technical Field

The utility model belongs to the technical field of the disposable dinner plate processing of PLA, a crystallization mould in PLA membrane is related to.

Background

Along with the process of urbanization, in order to meet the increasing portable dining requirements of people, the use requirement of the disposable dinner plate is larger and larger; the disposable dinner plate made of the PLA degradable material gradually replaces a white foam dinner plate with poor environmental protection;

at present, disposable PLA dinner plates are mainly produced by a processing technology of plastic uptake processing, and in order to enable the dinner plates to have better heat resistance and wider use temperature range, the PLA dinner plates are required to be crystallized;

when the PLA dinner plate is subjected to plastic suction processing, the PLA dinner plate is processed and formed in a mode of one mould with multiple cavities, so that leftover materials for separating the dinner plates in a certain area are arranged in a plate PLA dinner plate plastic suction product, wherein the leftover materials are recyclable materials; in order to better reduce the production cost and improve the utilization rate of raw materials, before the crystallization modification of the PLA dinner plate (the modified leftover materials cannot be directly applied and have small recycling significance), the leftover materials and the PLA dinner plate are separated to realize recycling;

therefore, during processing, the plastic suction process and the crystallization process are separated, after the plastic suction processing of the PLA dinner plate product is finished, the PLA dinner plate product is taken out, the PLA dinner plate product and leftover materials are separated, and then the PLA dinner plate product is sent into specific crystallization equipment to carry out secondary structure and crystallization modification; the whole processing procedure is more complicated, so that the production efficiency is reduced;

meanwhile, the crystallization modification of the PLA dinner plate is mainly to make the heat resistance and wider use temperature range better, but also to cause the brittleness, lower impact strength and poorer ductility of the plastic; especially, the edge of the PLA dinner plate is thinner, and when the dinner plate is used, in order to avoid scalding caused by heat generated by food in the dinner plate, a user generally takes the PLA dinner plate by pinching the edge of the dinner plate, and the edge of the dinner plate which is high in brittleness and low in impact strength at present obviously does not meet the use requirement of the market.

SUMMERY OF THE UTILITY MODEL

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a mold for primary crystallization in a PLA film, comprising: a forming die core layer and a refrigerating layer;

wherein: the forming die core layer is provided with: a plurality of molding cavities and corner grooves for independently separating the molding cavities; a heating oil path for heating and keeping the temperature of the forming die core layer constant is preset in the forming die core layer;

a plastic suction gas circuit for realizing plastic suction processing and a gas hole arranged in the forming cavity are also arranged in the forming mold core layer;

the refrigerating layer is provided with refrigerating layer wall vacant sites with the same positions and quantity as the cavity positions in the forming die core layer; a refrigeration waterway for refrigerating and cooling the refrigeration layer is preset in the refrigeration layer.

As a further aspect of the present invention: the upper edge of the refrigerating layer vacancy-avoiding position of the refrigerating layer is formed with an edge forming strip arranged along the upper edge of the refrigerating layer vacancy-avoiding position.

As a further aspect of the present invention: a heat insulation layer for separating the forming die layer from the refrigerating layer, reducing mutual heat exchange and temperature interference is arranged between the forming die layer and the refrigerating layer; the heat insulation layer is provided with heat insulation layer wall vacant sites with the same positions and number as the die cavities in the forming die core layer, and the heat insulation layer is embedded and installed on the forming die core layer.

The utility model has the advantages that: when the disposable PLA dinner plate is processed, the disposable plastic sucking crystallization processing in the mould of the PLA dinner plate is realized under the condition that the recyclable leftover materials can not be crystallized, so that the secondary processing procedures are reduced, the processing efficiency is improved, and the production cost is reduced;

the amorphous disc edge is formed on the disposable PLA crystal dinner plate, so that the disc edge has better impact strength and ductility; is more suitable for the use of daily disposable dinner plates.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the core layer of the forming die of the present invention.

Fig. 3 is a schematic structural diagram of the thermal insulation layer in the present invention.

Fig. 4 is a schematic structural diagram of the middle refrigerating layer of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments, and it should be understood that the present application is not limited to the example embodiments disclosed and described herein. 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 application.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The utility model provides a please refer to and draw together 1 ~ 4, in the embodiment of the utility model, a crystallization mould in PLA membrane, the manufacturing process of the disposable dinner plate of mainly used PLC, with crystallization plastic uptake equipment cooperation, it includes: the forming die comprises a forming die core layer 1, a heat insulation layer 2 and a refrigeration layer 3 which are arranged from bottom to top;

wherein:

the forming die core layer 1 is provided with: a plurality of forming cavities 11 and corner grooves 12 for independently separating the forming cavities 11; a heating oil path for heating and keeping the temperature of the forming die core layer 1 constant is preset in the forming die core layer 1; when the forming die core layer 1 is used, the heating oil way is connected with an external hot oil engine, hot oil is supplied through the hot oil engine and enters the refrigerating water way, and the hot oil circularly flows between the hot oil engine and the heating oil way to realize the heating work of the forming die core layer 1;

a plastic suction gas circuit for realizing plastic suction processing and an air hole arranged in the forming cavity 11 are also arranged in the forming die core layer 1;

the heat insulation layer 2 is provided with heat insulation layer wall vacant sites 21 with the same positions and quantity as the cavities 11 in the forming die core layer 1; the heat insulation layer 2 is embedded and mounted on the forming die core layer 1; the forming die layer 1 and the refrigerating layer 3 are separated through the heat insulation layer 2, so that mutual cold and heat exchange and temperature interference are reduced.

The refrigerating layer 3 is provided with refrigerating layer wall vacant sites 31 with the same position and quantity as the cavity 11 in the forming die layer 1, and the upper edge of the refrigerating layer vacant sites 31 is formed with edge forming strips 32 arranged along the upper edge of the refrigerating layer vacant sites;

a refrigeration waterway for refrigerating and cooling the refrigeration layer 3 is preset in the refrigeration layer 3; when the refrigeration device is used, the refrigeration waterway is connected with an external water cooler, cold water is supplied through the water cooler, the cold water enters the refrigeration waterway, and the refrigeration work of the refrigeration layer 3 is realized through the circulating flow of the cold water between the water cooler and the refrigeration waterway.

The crystallization mold is applied to crystallization plastic suction equipment; when in processing, the PLA raw material sheet to be processed is baked and heated by a crystallization and blistering device, then the heated PLA raw material sheet is absorbed into a crystallization mold by the crystallization and blistering device, the PLA raw material sheet product area corresponding to the position of the molding cavity 11 can be absorbed into the molding cavity 11 to form a dinner plate product corresponding to the structure of the molding cavity 11, and the dinner plate product is continuously heated to the crystallization temperature (the crystallization temperature is about 115 ℃) by the molding core layer 1 for crystallization;

the blank area of the PLA raw material sheet corresponding to the position of the blank groove 12 is tightly attached to the refrigerating layer 3, and the PLA raw material sheet in the area is kept below the crystallization temperature through the refrigerating layer 3, so that the crystallization reaction is avoided;

further forming the PLA raw material sheet into a plate material of the dinner plate product with the crystallized dinner plate product and the non-crystallized leftover material; realizing the in-mold once crystallization processing of the PLA dinner plate; and then demolding, separating the dinner plate products and the leftover materials in the plate materials of the dinner plate products to obtain PLA modified crystallized dinner plate products, and putting the non-crystallized leftover materials into the raw material processing equipment again for secondary utilization.

Meanwhile, the PLA raw material sheet can form an amorphous dinner plate edge integrated with the crystalline dinner plate product on the edge forming strip 32 of the refrigerating layer 3; compared with the traditional crystallized edge, the amorphous dinner plate edge has better impact resistance and ductility; is more suitable for the use of daily disposable dinner plates.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single crystallization mold in a PLA film, comprising: a forming die core layer and a refrigerating layer;

2. The die for primary crystallization in a PLA film as claimed in claim 1, wherein the upper edge of the refrigerating layer space-avoiding portion of the refrigerating layer is formed with an edge forming strip along the upper edge thereof.

3. The die for one-time crystallization in a PLA film as in claim 1, wherein a heat insulation layer for separating the forming die layer from the refrigerating layer, reducing mutual heat exchange and temperature interference is arranged between the forming die layer and the refrigerating layer; the heat insulation layer is provided with heat insulation layer wall vacant sites with the same positions and number as the die cavities in the forming die core layer, and the heat insulation layer is embedded and installed on the forming die core layer.