CN111086199B

CN111086199B - Method and device for laminating paper pulp molded product

Info

Publication number: CN111086199B
Application number: CN201911304145.XA
Authority: CN
Inventors: 王文强; 缪应秋; 邵长山; 刘思琪
Original assignee: Yongfa Henan Moulding Technology Development Co ltd
Current assignee: Yongfa Henan Moulding Technology Development Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2021-08-03
Anticipated expiration: 2039-12-17
Also published as: CN111086199A

Abstract

The invention relates to the technical field of paper pulp molded products, and discloses a method for coating a film on a paper pulp molded product, which solves the problems that the existing paper pulp molded product is easily influenced by moisture, reduces the strength of the paper pulp molded product, is not beneficial to packaging the product with high requirements on environmental influence and is easy to scratch. Before film coating, a film coating jig is designed according to the shape of a product, so that the product is fixed on the jig; the temperature of the film laminating machine is set between 500 ℃ and 600 ℃, so that the film is melted and expanded and cannot be melted and broken; the film is flatly placed on the surface of the product, and after the film is heated, the film is blown for 2 to 5 seconds, so that the film is completely attached to the surface of the product; the film covering effect is better.

Description

Method and device for laminating paper pulp molded product

Technical Field

The invention belongs to the technical field of paper pulp molded products, and particularly relates to a film coating method for a paper pulp molded product.

Background

The paper pulp molding takes plant fibers such as waste paper, bamboo pulp, sugarcane pulp, wood pulp and the like as raw materials, uses a mold to suck, filter and form the plant fibers in a pulp state to prepare a wet blank, and then carries out hot press shaping to prepare a finished product; the technology does not need any adhesive, can be made into paper products with complex shapes and higher requirements on dimensional accuracy, and is a technology for obtaining ideal packaging materials; the product can be completely degraded after being used and discarded, has the advantages of environmental protection, degradability, recycling and the like, and becomes a new environment-friendly packaging material.

Pulp molded products are becoming more popular in the market, and more pulp molded products are applied to food and product packages susceptible to moisture. However, with the increasing requirement of human beings on the packaging quality, the existing paper pulp molded product is easily affected by moisture and is easy to reduce the strength of the paper pulp molded product, the packaging requirement on environment is high, and the paper pulp molded product is not beneficial to popularization and use due to products which are easily scratched such as food and products which are easily affected by moisture. Therefore, there is a need to coat a surface of a pulp molded product with a film in order to solve the above-mentioned problems faced in the industry.

Disclosure of Invention

Aiming at the situation, the invention provides a film coating method for a paper pulp molding product to overcome the defects of the prior art, effectively solves the problems that the existing paper pulp molding product is easily influenced by moisture and the strength of the paper pulp molding product is reduced, and simultaneously ensures good water resistance and product protection effects, thereby being widely used for packaging products which have high requirements on environmental influence and are easy to scratch.

In order to achieve the purpose, the invention provides the following technical scheme:

a method for laminating a paper pulp molding product specifically comprises the following steps:

step one, selecting types and requirements of membranes: selecting a film material with high temperature resistance, strong viscosity and high ductility, such as a bright film (PP film, EVOH film) and a matte film (PP film), wherein the film thickness is between 60 and 90 um; the membrane material has environmental protection requirement; further preferably, the bonding surface of the film and the product is coated with an adhesive;

step two, manufacturing a paper pulp molding product jig: before film covering, a film covering jig is needed to fix a product, the film covering jig is designed according to the shape of the product, so that the product can be fixed on the jig, and poor film covering effect caused by product displacement in the air blowing process is prevented;

the film coating jig is provided with the air holes, so that the product is adsorbed on the surface of the jig in the film coating process, the product is further prevented from shifting in the air blowing process, and the film coating effect is better;

for different products, the manufacturing requirements of the jig are different, the female die product only needs to be provided with the female die product jig corresponding to the female die product, as shown in fig. 4, only a film needs to be arranged on the upper surface of the product, and the film is blown after being heated so as to be completely attached to the surface of the product;

for the male die product with a large cavity height, if only the film is placed on the upper surface of the product and the film is blown after heating, the air flow is difficult to reach around the lug boss of the male die product, particularly at the corner of the lug boss and the intersection of the lug boss and the bottom surface, so that gaps exist at the positions, the film cannot be completely attached to the surface of the product, and the pulp molded product is not firmly bonded with the film and is easy to separate. Researches find that the problems can be solved by arranging a baffle on a male die product jig, wherein the baffle forms a concave cavity around the edge of a product, as shown in fig. 3, and further, the baffle is 8-10mm high, so that airflow can be concentrated on the periphery of a boss of a male die product, particularly the corners of the boss and the intersection of the boss and the bottom surface, and a film can be completely attached to the surface of the product without generating a gap; too low or too high baffle is unfavorable for the air current to concentrate in boss periphery, can not produce the space completely.

Step three, a film covering process: setting the temperature of the film laminating machine between 500-600 ℃, setting the heating time of the film to be 5-10S, and in the heating process, melting and extending the film without melting and breaking; and flatly placing the film on the surface of a product, fixing the position of the film through a clamp, and blowing the film for 2-5 seconds after heating, wherein the blowing is required to be uniform, so that the film is completely attached to the surface of the product.

Furthermore, the adhesive in the film is melted by heating, so that the adhesive film and the pulp molding product have strong viscosity, and the pulp molding product is firmly adhered to the film and is not easy to separate;

step four, cutting the pulp molding product: the excess part is cut off by the cutter, and the pulp molding product is firmly bonded with the film without separation.

A film covering device for a paper pulp molding product used by the film covering method comprises a machine body, wherein a film covering mechanism is arranged on the machine body, a film covering table is arranged on one side of the machine body, a paper pulp molding fixing groove is formed in the film covering table, and a paper pulp molding product jig is placed in the paper pulp molding fixing groove.

Preferably, the lower end of the paper pulp molding product jig is fixedly connected with a jig base, and the jig base is movably connected with the paper pulp molding fixing groove.

Preferably, the pulp molding product jig is provided with air holes.

Preferably, the convex pulp molding product jig is provided with a baffle plate, the height of the baffle plate is 8-10mm, and a concave cavity is formed around the edge of the product.

Compared with the prior art, the invention has the beneficial effects that:

(1) and the appearance is bright: the coated paper pulp molded product is bright in appearance, the surface glossiness is increased, and the appearance effect of the paper pulp molded product is improved;

(2) the protection effect is achieved: the pulp molded product after film covering is easy to protect the product from being damaged, and particularly plays a role in protecting through the film like some products with low strength and precision;

(3) and strong water resistance: the paper pulp molding product has the problem of moisture absorption, various products are easily subjected to moisture absorption when being placed in paper-plastic packages, and moisture permeation is blocked after the paper molding product is coated, so that the product is not easily damaged by moisture.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of a lamination station of the present invention;

FIG. 3 is a schematic structural view of a male mold pulp molded product jig according to the present invention;

FIG. 4 is a schematic view of a female mold product fixture according to the present invention;

in the figure: 1. a body; 2. a film covering mechanism; 3. a film coating table; 4. fixing the slot; 5. a linking seat; 6. fixing the inserted rod; 7. a paper pulp molding fixing groove; 8. a male mould pulp moulding product jig; 9. a jig base; 16. air holes; 17. a baffle sidewall; 18. a boss; 19. a concave cavity; 20. a baffle plate; 21. the periphery of the boss.

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.

In the first embodiment, as shown in fig. 1, 2, 3 and 4, the present invention includes a machine body 1, a film covering mechanism 2 is disposed on the machine body 1, the film covering mechanism 2 is used for covering a film, a film covering table 3 is disposed on one side of the machine body 1, four fixing slots 4 are symmetrically disposed on the film covering table 3, a connecting base 5 is disposed on the film covering table 3, four fixing insertion rods 6 are symmetrically disposed under the connecting base 5, the fixing insertion rods 6 are matched and movably connected with the fixing slots 4, the connecting base 5 and the film covering table 3 are movably connected with the fixing slots 4 through the fixing insertion rods 6, the connecting base 5 can be conveniently detached through the fixing slots 4, and the fixing slots 4 do not affect other film covering operations of the film covering machine during ordinary film covering, a pulp molding fixing groove 7 is disposed on the connecting base 5, a concave-convex pulp molding product 8 is disposed in the pulp molding fixing groove 7, the concave-convex pulp molding product jig 8 is used for fixing pulp molding so as to perform film coating.

In the second embodiment, on the basis of the first embodiment, as shown in fig. 2 and 4, a jig base 9 is fixedly connected to the lower end of the concave-convex pulp molding product jig 8, and the jig base 9 is movably connected to the pulp molding fixing groove 7.

In the third embodiment, on the basis of the second embodiment, as shown in fig. 3 and 4, the pulp molding product jig 8 is provided with a plurality of air holes 16, and some air holes 16 are added to the jig, so that the product is adsorbed on the surface of the jig in the film coating process, and the film coating effect is better.

In the fourth embodiment, as shown in fig. 3, for the male mold product with a large cavity height, the baffle 20 is arranged on the male mold product jig 8, and the film can be completely attached to the surface through the baffle side wall 17 with the height of 8-10 mm. The baffle 20 forms a cavity 19 around the product edge, as shown in figure 3, and further the baffle is 8-10mm high, so that the air flow can be concentrated at the boss periphery 21 of the male product, particularly at the corners of the boss 18, and at the intersection of the boss and the base, and the film can be completely attached to the product surface without creating voids.

The working principle is as follows: during operation, the paper pulp molding is fixed through the paper pulp molding product jig 8, then the paper pulp molding product jig 8 is placed in the paper pulp molding fixing groove 7 in the connecting seat 5, the paper pulp molding product jig 8 is fixed, and a film material with high temperature resistance, strong viscosity and high ductility is selected, such as a bright film (PP film, EVOH film) and a matte film (PP film), the film thickness is between 60 and 90um, and the film material has environmental protection requirements; setting the temperature of the film laminating machine between 500-600 ℃, setting the heating time of the film to be 5-10S, wherein the film is required to be melted and extended and not to be melted and broken in the heating process; the film is flatly placed on the surface of a product, the position of the film is fixed through a clamp, the film is blown for 2-5 seconds after being heated, the blowing is required to be uniform, the film is completely attached to the surface of the product, an adhesive in the film is melted through heating, the adhesive film and a pulp molded product are strong in viscosity, the pulp molded product is firmly adhered to the film and is not easy to separate, and finally, subsequent cutting is carried out to finish the processing of a finished product.

It is 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.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A method for laminating a paper pulp molded product comprises the following steps:

step one, membrane selection: selecting a PP film or an EVOH film, wherein the thickness of the film is between 60 and 90 micrometers; coating adhesive on the joint surface of the film and the product;

step two, manufacturing a paper pulp molding product jig: before film coating, a film coating jig is designed according to the shape of a product, so that the product is fixed on the jig; the male die product jig is provided with the baffle, the height of the baffle is 8-10mm, airflow can be concentrated on the periphery of the boss of the male die product, and a film can be completely attached to the surface of the product without generating gaps; forming a cavity around the edge of the product;

step three, a film covering process: setting the temperature of the film laminating machine between 500-600 ℃, setting the heating time of the film to be 5-10S, and in the heating process, melting and extending the film without melting and cracking; and flatly placing the film on the surface of the product, fixing the position of the film through a clamp, and blowing 2-5S to the film to ensure that the film is completely attached to the surface of the product.

2. The pulp molding product film coating method according to claim 1, characterized in that:

the method also comprises the following step four of cutting the pulp molding product: the excess is cut off.

3. The pulp molding product film coating method according to claim 1, characterized in that:

and step two, arranging air holes in the film laminating jig, and adsorbing the product on the surface of the jig in the film laminating process.

4. A film covering device for the film covering method of the pulp molding product according to any one of claims 1 to 3, which comprises a machine body, and is characterized in that: the paper pulp molding machine is characterized in that a film laminating mechanism is arranged on the machine body, a film laminating table is arranged on one side of the machine body, a fixed slot is formed in the film laminating table, a connecting seat is placed on the film laminating table, a fixed inserting rod is arranged below the connecting seat, the fixed inserting rod is matched with the fixed slot and movably connected with the fixed slot, the connecting seat is movably connected with the film laminating table through the fixed inserting rod, a paper pulp molding fixed slot is formed in the connecting seat, a paper pulp molding product jig is placed in the paper pulp molding fixed slot, a baffle is arranged on the male mold product jig, the height of the baffle is 8-10mm, and a concave cavity is formed around the edge of a product; the lower end of the paper pulp molding product jig is fixedly connected with a jig base, and the jig base is movably connected with the paper pulp molding fixing groove.

5. The laminating device according to claim 4, wherein: the paper pulp molding product jig is provided with a plurality of air holes.