CN112160191A - Composite splicing type paper-plastic mold and paper-plastic product molding method - Google Patents

Abstract

The invention discloses a composite splicing type paper-plastic mold which comprises an upper mold and a lower mold, wherein the upper mold and the lower mold form a mold cavity after being closed, the upper mold and the lower mold are positioned on one side surface of the mold cavity and respectively constructed into a first forming part and a second forming part, the lower mold comprises a lower mold base and a lower mold core, the lower mold core comprises M mold core units, at least N mold core units are combined on the lower mold base to form the second forming part on one side of the mold cavity when the mold is closed, and a gap convenient for exhausting is formed between every two adjacent mold core units and/or between the lower mold base and the lower mold core; wherein M and N are positive integers, and M is more than or equal to N and more than or equal to 2. The mold of the composite splicing type paper-plastic mold provided by the invention is low in processing cost, and the labor cost is saved.

Description

Composite splicing type paper-plastic mold and paper-plastic product molding method

Technical Field

The invention relates to a paper-plastic mould for paper pulp moulding, in particular to a composite splicing type paper-plastic mould. The invention also relates to a paper-plastic product forming method for producing the paper-plastic product by adopting the composite spliced paper-plastic mold.

Background

The paper pulp molding package is commonly called as a paper holder, is a new industry, and utilizes materials such as renewable resources, waste newspaper, waste paper boxes and the like for reprocessing, thereby reducing the pollution of waste paper on one hand, and more importantly, greatly relieving the consumption of paper raw material wood. At present, the process of pulp molding is developed faster in China, and comprises the steps of paper shredding → pulping → forming → drying → shaping → quality inspection and the like. The process is complicated and belongs to labor intensive industry. The product can be applied to industrial packaging, such as automobile spare parts, bulbs, electronic products and the like. It can also be used for packing agricultural products, such as paper tray for fruit, egg tray for egg, duck egg, etc. Or in food grade packaging or containers such as disposable degradable tableware, drinking cups, coffee cups, etc., but at a relatively high cost. At present, many enterprises are promoted to manufacture pulp molding products in China, but the problems of small enterprise scale, not strict quality control, serious export bottleneck, lack of designers, lack of production management experientials and the like generally exist.

With the development of technology, there are some enterprises that use plant fibers such as bagasse as raw materials to make fiber-containing slurry, and then make the slurry into a product wet blank in a forming device, and the wet blank is further placed into a hot-pressing mold, and then the moisture in the wet blank is separated from the paper-plastic mold by heating and mold pressing. This means that after the paper-plastic mold is processed into a finished mold, air vents need to be provided, generally, holes are punched on the lower mold of the paper-plastic mold, the number of the holes is between 15 and 50, and the number of the air vents needed is determined according to the size of the paper-plastic mold, the depth of the mold cavity and the complexity. And the exhaust hole needs to be communicated to an exhaust groove of the lower die base, the punching is accurate, and if the exhaust hole cannot be communicated with the exhaust groove of the lower die base, the exhaust hole is invalid, so that the exhaust effect cannot be achieved. For example, in the solution disclosed in chinese patent publication CN101111641A, a plurality of nail-shaped drainage grooves are provided on both the upper mold (female mold) and the lower mold (male mold) of the mold, and the drainage grooves extend to the molding space for draining water vapor during the wet blank molding process. Meanwhile, in the patent, the discharge of moisture can be accelerated by the vacuum suction device. In this patent publication, the drainage channel is formed by inserting a sharp object such as a nail during the sintering of the mold and removing the nail after the mold is formed. Therefore, both the mode of punching after the die is manufactured and the mode of forming the drainage structure in the die manufacturing process are labor-consuming, and on the other hand, the manufacturing cost of the die is increased.

Disclosure of Invention

In view of the above problems in the prior art, the present invention aims to provide a composite splicing type paper-plastic mold with low processing cost and easy maintenance.

In order to achieve the above object, the present invention provides a composite splicing type paper-plastic mold, including an upper mold and a lower mold which are closed to form a mold cavity, wherein the upper mold and the lower mold are located on one side surface of the mold cavity and respectively configured as a first forming portion and a second forming portion, the lower mold includes a lower mold base and a lower mold core, the lower mold core includes M mold core units, when the mold is closed, at least N mold core units are combined with the lower mold base to form the second forming portion on one side of the mold cavity, and a gap facilitating air exhaust is formed between two adjacent mold core units and/or between the lower mold base and the lower mold core; wherein M and N are positive integers, and M is more than or equal to N and more than or equal to 2.

Preferably, the lower die base is provided with an accommodating cavity, and the N die core units are accommodated in the accommodating cavity during die assembly.

Preferably, the bottom of the accommodating cavity is provided with an exhaust groove convenient for exhausting.

Preferably, the vent grooves comprise a first vent groove and a second vent groove which are communicated with each other, wherein the first vent groove and/or the second vent groove are at least partially communicated with the gap between two adjacent mold core units.

Preferably, the first exhaust grooves are provided in plurality in parallel in a first direction.

Preferably, the lower mold base is provided with base exhaust holes corresponding to the plurality of first exhaust grooves.

Preferably, the second air discharge groove is located at a side of the accommodating cavity and extends along a second direction, and the first direction is perpendicular to the second direction.

Preferably, the first direction is perpendicular to the splicing arrangement direction of the plurality of the die core units.

Preferably, an exhaust hole communicated to the gap between the lower die base and the lower die core is formed between every two adjacent die core units.

Preferably, the exhaust hole is a long slotted hole formed along the gap between two adjacent mold core units.

Preferably, a plurality of exhaust holes are arranged at intervals along the gap between two adjacent mold core units.

Preferably, at least one side surface of the die core unit along the splicing direction is provided with an air hole forming part which forms the air vent hole when the lower die core is spliced.

Preferably, the air hole forming parts arranged on two adjacent mold core units are opposite to each other to form the air vent when the lower mold model is formed by splicing.

Preferably, the two opposite sides of the core unit are provided with ribs, and when the mold is closed, the ribs abut against the upper mold to form the mold cavity.

Preferably, a clamping plate which abuts against the N mold core units is arranged in the accommodating cavity in parallel to the mold core units.

Preferably, a plurality of screw holes penetrating through the accommodating cavity are formed in the side edge of the lower die base on one side of the clamping plate, and locking screws tightly pressing the clamping plate to enable the plurality of die core units to be tightly matched are arranged in part of the screw holes.

Preferably, the base vent hole is formed in a side edge of the lower die base opposite to the screw hole.

Preferably, an exhaust cover plate is arranged on the outer side of the lower die base corresponding to the exhaust hole of the base.

Preferably, the exhaust cover plate is fixed on the lower die base through screws, a gas collection cavity covering the base exhaust holes is formed at one side close to the lower die base, and the inner wall of the gas collection cavity is provided with an opening for exhausting outwards.

The invention also provides a paper-plastic product forming method for producing a paper-plastic product by adopting the composite split joint type paper-plastic mold, which comprises the following steps:

according to the specification of the paper-plastic product, selecting N mold core units from the M mold core units and combining the N mold core units to a lower mold base to form a lower mold core;

placing a product wet blank of a paper-plastic product prepared by a forming device on a lower die core;

heating and pressing down the upper die to dry the wet blank, wherein water vapor in the drying process is discharged from a gap formed between two adjacent die core units and/or between the lower die base and the lower die core;

and lifting the upper die, adsorbing the formed product through the sucker component, and simultaneously applying air flow to the lower die, wherein the air flow impacts the formed product through the gap and enables the formed product to be separated from the lower die.

Compared with the prior art, the composite splicing type paper-plastic mold and the paper-plastic product forming method provided by the invention have the advantages that the lower mold core is formed by utilizing the plurality of mold core units, the lower mold core is formed by combining the lower mold core on the lower mold base, and a gap which is convenient for exhausting is formed between two adjacent mold core units and/or the lower mold base and the lower mold core, so that water vapor generated in the hot-press forming process of a wet blank can be exhausted through the gap. Therefore, the exhaust holes are not processed on the lower die, the die processing cost is low, and the labor cost is saved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

This document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

Fig. 1 is a schematic perspective view of the composite splicing type paper-plastic mold of the invention.

Fig. 2 is a schematic structural view of another view angle of the composite splicing type paper-plastic mold of the invention.

Fig. 3 is a schematic sectional view taken along the line a-a in fig. 2 according to the present invention.

Fig. 4 is a schematic perspective exploded view (including a partially enlarged view) of the composite splicing type paper-plastic mold of the present invention.

Fig. 5 is a schematic structural diagram (not including an upper mold) of another view angle of the composite splicing type paper-plastic mold of the invention.

Fig. 6 is a schematic sectional view taken along the direction B-B in fig. 5.

Fig. 7 is a schematic structural diagram of another view angle of the composite splicing type paper-plastic mold of the present invention (including a partially enlarged view without an upper mold).

Fig. 8 is a schematic view of the bottom structure of the upper mold of the composite splicing type paper-plastic mold of the invention.

FIG. 9 is a schematic diagram of a three-dimensional explosion structure of a lower mold base of the composite splicing type paper-plastic mold of the invention (comprising a lower mold core and an exhaust cover plate);

fig. 10 is a schematic structural view of an exhaust cover plate of the composite splicing type paper-plastic mold of the invention.

The main reference numbers:

1-upper mould; 2-lower die core; 3-lower die base; 4-a mold cavity; 5-clamping plate; 6-exhaust hood panel; 11, 12-a first forming section; 25-vent hole; 31-an accommodating cavity; 32-a first exhaust groove; 33-a second vent slot; 35-screw holes; 36-base vent hole; 37-exhaust cover plate fixing screw holes; 61-opening a hole; 62-fixed hole, 63-gas collecting cavity; 211-second forming section; 212-air hole forming part; 213, 214-fins.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described below clearly and completely with reference to the accompanying drawings of the embodiments of the present disclosure.

It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present disclosure clear and concise, a detailed description of known functions and known components have been omitted from the present disclosure.

As shown in fig. 1, 2 and 3, a composite splicing type paper-plastic mold according to an aspect of the present invention includes an upper mold 1 and a lower mold (not shown) that form a mold cavity after mold closing, where the surfaces of the upper mold 1 and the lower mold on one side of the mold cavity 4 are respectively configured as a first molding portion and a second molding portion, and the first molding portion and the second molding portion correspond to different surface structures according to different molded product structures. Referring to fig. 8, first forming portions 11, 12 are formed on the surface of the upper die 1 on the side opposite to the lower die. Fig. 4 and 7 show the second molding portion 211 of the lower mold 1. Specifically, in this embodiment, as shown in fig. 4, the lower mold 1 includes a lower mold base 3 and a lower mold core 2, the lower mold core 2 includes M core units 21, at least N core units 21 are combined with the lower mold base 3 to form the second molding portion 211 on the side of the mold cavity 4 when mold closing is performed, and a gap facilitating air exhaust is formed between two adjacent core units 21 and/or the lower mold base 3 and the lower mold core 2; wherein M and N are positive integers, and M is more than or equal to N and more than or equal to 2. Specifically, the lower die is in a composite splicing mode, the lower die core 2 is combined on the lower die base 3, and a gap exists between the lower die core and the lower die base, so that the two opposite sides of the core unit 21 are provided with convex edges 213 and 214 in the hot press molding process of a wet blank, and the convex edges are abutted against the upper die 1 during die assembly to form the die cavity 4. A wet product blank (not shown) is placed in the mold cavity 4 and moisture can escape from the gap between the lower mold core 2 and the lower mold base 3. More importantly, the lower mold core 2 can be formed by splicing a plurality of core units 21, and similarly, a gap exists between two adjacent core units 21, which further enables moisture to be discharged from the gap between the core units 21. This means that the paper-plastic mold in this application does not need to take into account the perforation problem when the mold is prepared. As can be seen from the above, in the technical solution of the present application, the core units 21 are used as basic units constituting the lower mold core 2, and a suitable number of core units 21 can be selected according to the actual specification of the molded product to be combined on the lower mold base 3. That is, within the maximum specification range of the paper-plastic mold design, an appropriate number of core units 21 can be selected according to actual production requirements. In this embodiment, taking the egg tray mold shown in fig. 3 and 4 as an example, a mold with a maximum capacity of 12 eggs is used, and 14 core units 21 are used, but if an egg tray with a capacity of 10 eggs is to be made, only two core units 21 need to be removed. Similarly, 12 core units 21 are combined on the lower mold base 3, and specifically, referring to fig. 4, a receiving cavity 31 is provided on the lower mold base 3, and when the mold is closed, N core units 21 are received in the receiving cavity 31. Like this at the hot briquetting in-process, the steam that the product wet base was heated and is produced can be arranged the holding chamber 31 through the clearance between mold core unit 21 in, in order to make the steam in the holding chamber 31 discharge smoothly, as preferred, the holding chamber 31 bottom is seted up the exhaust duct (not mark in the figure) of being convenient for exhaust. The purpose of the air vent is to conduct the water vapor conducted in the gap between the core units 21 to the side position and to vent the water vapor from the gap between the lower mold core 2 and the lower mold base 3 at the side position. Specifically, the vent grooves include a first vent groove 32 and a second vent groove 33 which are communicated with each other, wherein the first vent groove 32 and/or the second vent groove 33 are at least partially communicated with the gap between two adjacent core units 21. In order to achieve uniform water vapor dispersion, it is preferable that the first exhaust grooves 32 are provided in plurality in parallel in the first direction. A plurality of first exhaust grooves 32 can be equidistantly distributed at the bottom of the accommodating cavity 31 and are connected with a plurality of die core units 21 in series, so that water vapor transferred from gaps among the die core units 21 is uniformly transferred to the side positions of the lower die base 3, and at the moment, base exhaust holes 36 corresponding to the plurality of first exhaust grooves 32 can be arranged on the lower die base 3. Referring to fig. 9, in some embodiments, the base vent hole 36 is formed on a side of the lower mold base 3 opposite to the screw hole 35. Further preferably, an exhaust cover plate 6 is provided outside the lower mold base 3 at a position corresponding to the base exhaust hole 36. The exhaust hood 6 is used for collecting the water vapor discharged from the base exhaust holes 36 and discharging the water vapor out of the mold, and therefore, as shown in fig. 10, preferably, the exhaust hood 6 is fixed to the exhaust hood fixing screw holes 37 of the lower mold base by screws (not shown) passing through fixing holes 62, so that the exhaust hood 6 is fixed as a whole, and a gas collecting chamber 63 covering the base exhaust holes 36 is formed at a side of the exhaust hood 6 close to the lower mold base 3, and the gas collecting chamber 63 can collect the water vapor of the plurality of base exhaust holes 36 and discharge the water vapor out through an opening 61 formed in an inner wall thereof for discharging the water vapor out.

As shown in fig. 5 and 6, the second air discharge groove 33 is located at a side of the accommodating chamber 31 and extends along a second direction, preferably, the first direction is perpendicular to the second direction. And preferably, the first direction is perpendicular to the splicing arrangement direction of the plurality of the core units 21. That is, the first direction represents an extending direction of the first exhaust groove 32, and this direction may be perpendicular to the gaps between the plurality of core units 21 and extend through the gaps formed by all the core units 21. The second direction is the extending direction of the second exhaust groove 33, and the second exhaust groove 33 is arranged to collect the water vapor collected by the first exhaust groove 32 and further to be exhausted by the base exhaust hole 36.

Referring to fig. 4, the side of the lower mold base 3 may be provided with a plurality of screw holes 35, the number of the screw holes may preferably correspond to the number of the first exhaust grooves 32 and the position of the screw holes corresponds to the first exhaust grooves 32, and the screw holes may be matched with locking screws (not shown) so that the plurality of mold core units 21 in the accommodating cavity 31 are mutually pressed into a tightly matched whole. And preferably, a clamping plate 5 is further added to prevent the locking screw from damaging the core unit 21.

In the present application, a gap between two core units 21 is used as a venting means by combining the core units 21, and in the case that the gap is small, a good venting effect may not be achieved, and therefore, in some embodiments, as shown in fig. 4, 6 and 7, a venting hole 25 communicating with the gap between the lower mold base 3 and the lower mold core 2 is provided between two adjacent core units 21. In the case of the embodiment in which the first exhaust groove 32 is provided, the exhaust hole 25 communicates with the first exhaust groove 32. Moreover, in order to avoid the air vent 25 from affecting the appearance of the paper-plastic product, it is preferable that the air vent 25 is provided as a long slot hole opened along the gap between two adjacent core units 21. So that no mark or only a small mark is left on the paper-plastic product after hot press molding. In order to achieve uniform ventilation, as shown in fig. 6, a plurality of vent holes 25 are provided at intervals along the gap between two adjacent core units 21.

For the formation of the vent holes 25, it is conceivable to provide a vent hole forming portion 212 that forms the vent holes 25 when the lower mold core 2 is assembled and constructed on at least one side surface of the core unit 21 in the assembling direction. Of course, the air hole forming parts 212 may be disposed on both sides of the core unit 21, and the air hole forming parts 212 disposed on two adjacent core units 21 are opposite to each other to form the air vent holes 25 when the lower mold model is assembled.

When the composite splicing type paper-plastic mould is used for producing a paper-plastic product, the method generally comprises the following steps:

according to the specification of the paper-plastic product, selecting N mold core units from the M mold core units and combining the N mold core units to a lower mold base to form a lower mold core; placing a product wet blank of a paper-plastic product prepared by a forming device on a lower die core; the forming equipment can adopt the existing wet blank forming equipment, and is not specifically described in the invention. After the wet blank is placed on the lower mold core, the upper mold is heated and pressed down to dry the wet blank, so that it can be understood that in the present invention, the upper mold and the lower mold of the paper-plastic mold are both made of a material capable of bearing pressure and conducting heat, such as a metal material. Water vapor in the drying process is discharged from a gap formed between two adjacent mold core units and/or the lower mold base and the lower mold core; finally the upper die is lifted and the formed product is sucked by means of a suction cup assembly (not shown). in contrast to the prior art, in the present invention, preferably simultaneously an air flow is applied to the lower die, which air flow through said gap pushes against the formed product and causes it to detach from the lower die.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims (20)

1. The composite splicing type paper-plastic mold comprises an upper mold and a lower mold which form a mold cavity after mold closing, wherein the upper mold and the lower mold are positioned on one side surface of the mold cavity and respectively constructed into a first forming part and a second forming part, the lower mold comprises a lower mold base and a lower mold core, the lower mold core comprises M mold core units, at least N mold core units are combined on the lower mold base to form the second forming part on one side of the mold cavity when the mold closing is carried out, and a gap convenient for exhausting is formed between every two adjacent mold core units and/or between the lower mold base and the lower mold core; wherein M and N are positive integers, and M is more than or equal to N and more than or equal to 2.

2. A paper-plastic mold as claimed in claim 1, wherein the lower mold base is provided with a receiving cavity, and when the mold is closed, the N mold core units are received in the receiving cavity.

3. A paper-plastic mold as claimed in claim 2, wherein the bottom of the accommodating cavity is provided with an exhaust groove for facilitating exhaust.

4. A paper-plastic mold according to claim 3, wherein the vent grooves comprise a first vent groove and a second vent groove that are in communication with each other, wherein the first vent groove and/or the second vent groove is in at least partial communication with the gap between two adjacent core units.

5. A paper-plastic mold according to claim 4, wherein the first exhaust grooves are arranged in parallel in the first direction.

6. A paper-plastic mold according to claim 5, wherein the lower mold base is provided with base vent holes corresponding to the plurality of first vent grooves.

7. A paper-plastic mold according to claim 5, wherein the second air discharge slot is located at a side of the accommodating cavity and extends along a second direction, and the first direction is perpendicular to the second direction.

8. A paper-plastic mold as claimed in claim 5, wherein the first direction is perpendicular to the splicing and arranging direction of the plurality of core units.

9. A paper-plastic mold as claimed in claim 1, wherein an air vent hole communicating with the gap between the lower mold base and the lower mold core is provided between two adjacent mold core units.

10. A paper-plastic mold as defined in claim 9, wherein said vent holes are elongated slots formed along said gap between two adjacent ones of said core units.

11. A paper-plastic mold as defined in claim 9, wherein a plurality of said vent holes are provided at intervals along said gap between two adjacent ones of said core units.

12. A paper-plastic mold according to claim 9, wherein at least one side surface of the core unit in the splicing direction is provided with an air hole forming part which forms the air vent hole when the lower mold core is spliced.

13. A paper-plastic mold according to claim 9, wherein the air hole forming parts provided on two adjacent core units are opposite to each other to form the air hole when the lower mold model is assembled.

14. A paper-plastic mold as defined in claim 1, wherein said core unit is provided with ribs on opposite sides thereof, said ribs abutting said upper mold during closing to define said mold cavity.

15. A paper-plastic mould as claimed in claim 2, wherein a clamping plate is arranged in the accommodating cavity parallel to the core units and tightly abuts against the N core units.

16. A paper-plastic mold as defined in claim 15, wherein a plurality of screw holes are provided through the side of said lower mold base on the side of said clamping plate to said receiving cavity, and a plurality of locking screws for tightening said clamping plate to fit said plurality of said core units are provided in some of said screw holes.

17. A paper-plastic mold according to claim 16, wherein the base vent holes are provided on a side of the lower mold base opposite to the screw holes.

18. A paper-plastic mold according to claim 17, wherein an exhaust cover plate is arranged on the outer side of the lower mold base corresponding to the exhaust holes of the base.

19. A paper-plastic mold as claimed in claim 18, wherein the exhaust cover plate is fixed on the lower mold base by screws, and a gas collection chamber is formed near one side of the lower mold base to cover the exhaust holes of the base, and the inner wall of the gas collection chamber is opened with an opening for exhausting gas outwards.

20. A method of forming a paper-plastic product carried out by the paper-plastic mold of any one of claims 1 to 17, the method comprising:

according to the specification of the paper-plastic product, selecting N mold core units from the M mold core units and combining the N mold core units to a lower mold base to form a lower mold core;

placing a product wet blank of a paper-plastic product prepared by a forming device on a lower die core;

heating and pressing down the upper die to dry the wet blank, wherein water vapor in the drying process is discharged from a gap formed between two adjacent die core units and/or between the lower die base and the lower die core;

and lifting the upper die, adsorbing the formed product through the sucker component, and simultaneously applying air flow to the lower die, wherein the air flow impacts the formed product through the gap and enables the formed product to be separated from the lower die.

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