阅读说明：本技术 加热模具 (Heating mould ) 是由 张鹏娥 张健 于博 张长春 骆玉叶 李卫华 于 2021-09-03 设计创作，主要内容包括：本发明提供了一种加热模具,加热模具包括：加热模板,加热模板具有成型模腔,成型模腔内用于放置待成型件；蒸汽加热管路,嵌设在加热模板内,蒸汽加热管路与成型模腔相对设置；其中,蒸汽加热管路内通入的蒸汽温度为T-(汽),加热模板的材料的导热系数为λ,成型模腔的总面积为A-(总)；蒸汽加热管路的流通截面的周长为l-(截)、蒸汽加热管路的壁面与成型模腔的壁面之间的距离为δ和蒸汽加热管路的总长度为L之间满足的关系式为：通过本发明提供的技术方案,能够解决现有技术中的加热模具内的蒸汽加热管路的设计方法的试模周期长的技术问题。(The invention provides a heating mold, which comprises: the heating die plate is provided with a forming die cavity, and the forming die cavity is used for placing a piece to be formed; the steam heating pipeline is embedded in the heating template and is arranged opposite to the molding die cavity; wherein the temperature of the steam introduced into the steam heating pipeline is T Steam generator The material of the heating template has a heat conductivity coefficient of lambda and the total area of the molding cavity is A General assembly (ii) a The circumference of the flow cross-section of the steam heating line is l Cutting block The relation satisfied between the distance delta between the wall surface of the steam heating pipeline and the wall surface of the molding die cavity and the total length L of the steam heating pipeline is as follows: through the technical scheme provided by the invention, the technical problem that the design method of the steam heating pipeline in the heating mould in the prior art has long mould testing period can be solved.)

1. A heated mold, comprising:

the heating die plate is provided with a forming die cavity, and a to-be-formed part is placed in the forming die cavity;

the steam heating pipeline is embedded in the heating template and is arranged opposite to the molding die cavity;

wherein the temperature of the steam introduced into the steam heating pipeline is T_{Steam generator}The material of the heating template has a thermal conductivity of lambdaThe total area of the molding cavity is A_{General assembly}(ii) a The circumference l of the flow cross-section of the steam heating line_{Cutting block}And the distance delta between the wall surface of the steam heating pipeline and the wall surface of the molding die cavity and the total length L of the steam heating pipeline satisfy the following relational expression:

2. the heated mold as set forth in claim 1, characterized in that said heated mold plate comprises a first mold plate (10) and a second mold plate (20), said first mold plate (10) being located above said second mold plate (20), said first mold plate (10) having a punch (12) thereon, said second mold plate (20) having a die (22) thereon, said punch (12) and said die (22) forming said forming cavity therebetween; the steam heating pipeline comprises a first steam heating pipeline (11) and a second steam heating pipeline (21), the first steam heating pipeline (11) is embedded in the first template (10), the second steam heating pipeline (21) is embedded in the second template (20), and the circulation section of the first steam heating pipeline (11) is circular;

wherein the material of the first template (10) has a thermal conductivity of λ₁(ii) a Diameter d of the first steam heating line (11)₁The total length L of the first steam heating pipeline (11)₁And the distance delta between the wall surface of the first steam heating pipeline (11) and the wall surface of the molding die cavity₁The satisfied relational expression is:

3. the heated mould according to claim 2, characterised in that the second steam heating circuit (21) has a circular flow cross-section and the second template (20) has a thermal conductivity λ [ [ lambda ] ]₂(ii) a The second steam heating pipeDiameter d of the road (21)₂The total length L of the second steam heating line (21)₂And the distance delta between the wall surface of the second steam heating pipeline (21) and the wall surface of the molding die cavity₁The satisfied relational expression is:

4. the heated mold of claim 3,

4mm≤d₁less than or equal to 20 mm; and/or the presence of a gas in the gas,

4mm≤d₂≤20mm。

5. the heating mold as claimed in claim 3, characterized in that the first steam heating line (11) has a flow surface of perimeter l₁The perimeter of the flow surface of the second steam heating pipeline (21) is l₂；

12mm≤l₁Less than or equal to 64 mm; and/or the presence of a gas in the gas,

12mm≤l₂≤64mm。

6. the heated mold of claim 3,

the first template (10) is of a square structure, and the first steam heating pipeline (11) is arranged back and forth along the length direction of the first template (10); and/or the presence of a gas in the gas,

the second template (20) is of a square structure, and the second steam heating pipeline (21) is arranged back and forth along the length direction of the second template (20).

7. The heated mold of claim 6,

the length of the first template (10) is m₁The number of the first steam heating pipelines (11) is N₁，N₁＝L₁/m₁(ii) a And/or the presence of a gas in the gas,

length of the second template (20)Is m₂The number of the second steam heating pipelines (21) is N₂，N₂＝L₂/m₂。

8. The heated mold of any one of claims 1 or 4 to 7 wherein the flow cross-section of the steam heating line is circular, or elliptical, or rectangular.

9. The heated mold as set forth in any one of claims 2 to 7,

the first template (10) is made of stainless steel or aluminum; and/or the presence of a gas in the gas,

the second template (20) is made of stainless steel or aluminum.

10. The heated mold of any one of claims 1 to 7, wherein the forming cavity may be circular, or square, or oval.

Technical Field

The invention relates to the technical field of heating molds, in particular to a heating mold.

Background

At present, a pulp tableware molding and drying device in the prior art comprises a steam heating mold, wherein high-temperature saturated steam is introduced into the steam heating mold, and a wet pulp tableware blank is heated and formed through the high-temperature saturated steam.

However, the steam heating pipeline in the existing steam heating mould is designed by depending on experience, and the mould test and the mould change are required to be carried out repeatedly, so that the mould test period is long, the mould change cost is high, the mould design efficiency is low, and the mould development cost is increased. Lack steam heating pipeline design method, steam heating pipeline design is too short, and the high temperature saturated steam in the steam heating mould can't take place the phase transition in a large number in the heating process, and the heat of high temperature saturated steam can't the fast transfer to wet pulp tableware blank, and heat exchange efficiency is low, and the stoving time is long, causes paper tableware production cycle long, production efficiency hangs down, and manufacturing cost is high.

Disclosure of Invention

The invention mainly aims to provide a heating mould to solve the technical problem that a design method of a steam heating pipeline in the heating mould in the prior art is long in mould testing period.

In order to achieve the above object, the present invention provides a heated mold comprising: the heating die plate is provided with a forming die cavity, and the forming die cavity is used for placing a piece to be formed; the steam heating pipeline is embedded in the heating template and is arranged opposite to the molding die cavity; wherein the temperature of the steam introduced into the steam heating pipeline is T_{Steam generator}The material of the heating template has a heat conductivity coefficient of lambda and the total area of the molding cavity is A_{General assembly}(ii) a The circumference of the flow cross-section of the steam heating line is l_{Cutting block}The distance between the wall surface of the steam heating pipeline and the wall surface of the molding die cavity is delta, and the total length of the steam heating pipeline is L, and the relation is as follows:

further, heatingThe die plate comprises a first die plate and a second die plate, the first die plate is positioned above the second die plate, a male die is arranged on the first die plate, a female die is arranged on the second die plate, and a forming die cavity is formed between the male die and the female die; the steam heating pipeline comprises a first steam heating pipeline and a second steam heating pipeline, the first steam heating pipeline is embedded in the first template, the second steam heating pipeline is embedded in the second template, and the flow section of the first steam heating pipeline is circular; wherein the material of the first template has a thermal conductivity of λ₁Diameter d of the first steam heating line₁The total length L of the first steam heating pipeline₁And the distance delta between the wall surface of the first steam heating pipeline and the wall surface of the molding die cavity₁The satisfied relational expression is:

furthermore, the flow section of the second steam heating pipeline is circular, and the heat conductivity coefficient of the second template is lambda₂(ii) a Diameter d of the second steam heating line₂The total length L of the second steam heating pipeline₂And the distance delta between the wall surface of the second steam heating pipeline and the wall surface of the molding die cavity₁The satisfied relational expression is:

further, d is not less than 4mm₁Less than or equal to 20 mm; and/or d is not more than 4mm₂≤20mm。

Further, the perimeter of the flow surface of the first steam heating pipeline is l₁The perimeter of the flow surface of the second steam heating pipeline is l₂；12mm≤l₁Less than or equal to 64 mm; and/or l is not more than 12mm₂≤64mm。

Furthermore, the first template is of a square structure, and the first steam heating pipeline is arranged back and forth along the length direction of the first template; and/or the second template is of a square structure, and the second steam heating pipeline is arranged back and forth along the length direction of the second template.

Further, the length of the first template is m₁The number of the first steam heating pipeline is N₁，N₁＝L₁/m₁(ii) a And/or the length of the second template is m₂The number of the second steam heating pipeline is N₂，N₂＝L₂/m₂。

Further, the flow cross section of the steam heating pipeline is circular, or elliptical, or rectangular.

Further, the first template is made of stainless steel or aluminum; and/or the second template is made of stainless steel or aluminum.

Further, the molding die cavity may be circular, or square, or oval.

By applying the technical scheme of the invention, the calculation formula of the parameters of the steam heating pipeline can be obtained according to the equation relation and the heat transfer rule in the heating process, and the relation between the specific parameter sizes of the steam heating pipeline is obtained through the calculation formula, so that the specific size of the steam heating pipeline can be selected and calculated on the basis of ensuring the heat exchange efficiency, the design process of the steam heating pipeline is simplified, and the design trial-mold period of the steam heating pipeline is reduced to a certain extent.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 illustrates a schematic structural diagram of a first template provided in accordance with an embodiment of the present invention;

FIG. 2 illustrates a schematic structural diagram of a second template provided in accordance with an embodiment of the present invention;

fig. 3 shows a schematic structural view of pulp tableware provided according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a first template; 11. a first steam heating line; 12. a male die; 20. a second template; 21. a second steam heating line; 22. a female die; 30. paper pulp tableware.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 and 2, an embodiment of the present invention provides a heated mold, and the present invention provides a heated mold including: the heating die plate is provided with a forming die cavity, and the forming die cavity is used for placing a piece to be formed; the steam heating pipeline is embedded in the heating template and is arranged opposite to the forming die cavity so as to heat the paper blank in the forming die cavity through steam in the steam heating pipeline; wherein the temperature of the steam introduced into the steam heating pipeline is T_{Steam generator}The thermal conductivity of the material of the heating template is lambda, and the perimeter of the flow cross-section of the steam heating pipeline is l_{Cutting block}The distance between the wall surface of the steam heating pipeline and the wall surface of the molding die cavity is delta, the total length of the steam heating pipeline is L, and the total area of the molding die cavity is A_{General assembly}. The number of the molding cavities can be set according to specific needs, and can be 1 or more. The circumference of the flow cross-section of the steam heating line is l_{Cutting block}The distance between the wall surface of the steam heating pipeline and the wall surface of the molding die cavity is delta, and the total length of the steam heating pipeline is L, and the relation is as follows:

specifically, the number of the molding cavities is n, and the internal surface area of the n molding cavities is A₁、A₂、…、A_n(ii) a The corresponding relation is as follows:

it should be noted that the to-be-formed part in this embodiment may mainly be a paper blank, and may also be a to-be-formed part made of other materials, and the main function of the heating mold is to heat and evaporate moisture in the to-be-formed part, so that the to-be-formed part is formed after the moisture in the to-be-formed part is reduced. Specifically, when the molded article is a paper blank, the pulp tableware 30 is molded after heating, and the size of the pulp tableware 30 may be approximately the same as the size of the molding cavity.

Adopt the heating mould that this embodiment provided, through the heat transfer law according to above-mentioned equality relation and in the heating process, can obtain the computational formula of the parameter of steam heating pipeline, through the relation between the specific parameter size of computational formula in order to obtain steam heating pipeline, in order to select and calculate the specific size of steam heating pipeline on the basis of guaranteeing the heat exchange efficiency, thereby the design process of steam heating pipeline has been simplified, the design trial-mould cycle of the steam heating pipeline of heating mould has been reduced in certain degree, help improving design efficiency and production efficiency, and the production cost is reduced.

Specifically, the heating die plate in the embodiment includes a first die plate 10 and a second die plate 20, the first die plate 10 is located above the second die plate 20, the first die plate 10 has a punch 12 thereon, the second die plate 20 has a die 22 thereon, and a molding cavity is formed between the punch 12 and the die 22; the steam heating pipeline comprises a first steam heating pipeline 11 and a second steam heating pipeline 21, the first steam heating pipeline 11 is embedded in the first template 10, the second steam heating pipeline 21 is embedded in the second template 20, and the circulation section of the first steam heating pipeline 11 is circular; wherein the material of the first template 10 has a thermal conductivity of λ₁Diameter d of the first steam heating line 11₁The total length L of the first steam heating line 11₁The distance δ between the wall of the first steam heating line 11 and the wall of the molding cavity₁The relation satisfied between them is:

specifically, when the number of the molding cavities is n, there are:

by adopting the structure, the size of the first steam heating pipeline 11 with the round section can be conveniently designed with adaptability, the design process of the first steam heating pipeline 11 with the round section is simplified, the design efficiency and the production efficiency are improved, and the production cost is reduced.

Note that the phrase "forming a molding cavity between the punch 12 and the die 22" means: after the punch 12 is installed in the die 22, a gap between the punch 12 and the die 22 forms a molding cavity.

In this embodiment, the second steam heating pipe 21 has a circular flow cross-section, and the second mold 20 has a thermal conductivity λ₂Diameter d of the second steam heating line 21₂The total length L of the second steam heating line 21₂The distance δ between the wall of the second steam heating line 21 and the wall of the molding cavity₁The relation satisfied between them is:

specifically, when the number of the molding cavities is n, there are:

by adopting the structure, the size of the second steam heating pipeline 21 with the round section can be conveniently designed with adaptability, the design process of the second steam heating pipeline 21 with the round section is simplified, the design efficiency and the production efficiency are improved, and the production cost is reduced.

In particular, d is not less than 4mm₁Less than or equal to 20 mm; and/or d is not more than 4mm₂Less than or equal to 20 mm. Preferably, the diameter of the first steam heating circuit 11 and the straight second steam heating circuit 21 are combinedThe diameters are all set within the numerical range, and a reasonable circumference range can be obtained by setting a reasonable diameter range, so that the tube wall of the first steam heating pipeline 11 and the tube wall of the second steam heating pipeline 21 can provide sufficient heat for the pulp tableware 30 in the forming die cavity, and unnecessary energy waste caused by overlong circumference can be avoided.

In the present embodiment, the perimeter of the flow surface of the first steam heating circuit 11 is l₁The perimeter of the flow surface of the second steam heating circuit 21 is l₂；12mm≤l₁Less than or equal to 64 mm; and/or l is not more than 12mm₂Less than or equal to 64 mm. Preferably, the sectional perimeter of the first steam heating pipeline 11 and the sectional perimeter of the second steam heating pipeline 21 are both set within the above numerical range, and by setting a reasonable numerical range, not only can the first steam heating pipeline 11 and the second steam heating pipeline 21 provide sufficient heat for the pulp tableware 30 in the forming cavity, which is convenient for the first steam heating pipeline 11 and the second steam heating pipeline 21 to be reasonably arranged, but also unnecessary energy waste caused by the long total length of the pipelines can be avoided.

Specifically, the first template 10 is a square structure, and the first steam heating pipeline 11 is arranged back and forth along the length direction of the first template 10; and/or, the second template 20 is of a square structure, and the second steam heating pipeline 21 is arranged back and forth along the length direction of the second template 20. Preferably, the first mold plate 10 and the second mold plate 20 are both square structures, the first steam heating pipeline 11 is arranged back and forth along the length direction of the first mold plate 10, and the second steam heating pipeline 21 is arranged back and forth along the length direction of the second mold plate 20, with such a structural arrangement, the arrangement of the first steam heating pipeline 11 and the second steam heating pipeline 21 can be optimized conveniently, so that the pulp tableware 30 in the forming mold cavity can be heated better through the first steam heating pipeline 11 and the second steam heating pipeline 21. Specifically, the punches 12 of the first template 10 are arranged along the length direction of the first template 10, and a plurality of rows of the punches 12 may be arranged along the width direction of the first template 10. The female dies 22 on the second mold plate 20 are arranged along the length direction of the second mold plate 20, and a plurality of rows of female dies 22 can be arranged along the width direction of the second mold plate 20.

Specifically, the first form 10 has a length of m₁The number of the first steam heating pipeline 11 is N₁，N₁＝L₁/m₁(ii) a And/or the second form 20 has a length m₂The number of the second steam heating line 21 is N₂，N₂＝L₂/m₂. Preferably, the number of the first steam heating pipeline 11 and the number of the second steam heating pipeline are both obtained by adopting the above calculation method, so that the operation is fast and convenient.

In this embodiment, the flow cross section of the steam heating line is circular, or elliptical, or rectangular. By adopting the dry structure, different flow cross sections can be selected according to different heating requirements and production requirements.

Specifically, the first template 10 is made of stainless steel or aluminum. By adopting the structure, the heat on the first template 10 can be conveniently and rapidly transferred into the forming die cavity, the heat conductivity is ensured, and the heat loss is avoided. The first template 10 may be made of a metal material.

In this embodiment, the molding cavities may be circular, square, oval, or other configurations. With such a structure, the pulp tableware 30 with different shapes can be produced conveniently.

In this embodiment, there is a corresponding method for designing a steam heating pipeline corresponding to the structure of the heating mold, and the method comprises: obtaining the heat flow q required by the blank_{Need to}(ii) a Obtaining the condensation heat exchange quantity q between the steam in the steam heating pipeline and the pipe wall of the steam heating pipeline_Condensation The heat transfer quantity q transferred from the pipe wall of the steam heating pipeline to the wall surface of the cavity_DieAnd the evaporation heat exchange quantity q between the wall surface of the cavity and the blank_{Evaporation of}(ii) a According to the relation q_Condensation ＝q_Die＝q_{Evaporation of}＝q_{Need to}And obtaining a calculation formula of parameters of the steam heating pipeline according to a heat transfer rule in the heating process.

By adopting the design method of the steam heating pipeline provided by the embodiment, the calculation formula of the parameters of the steam heating pipeline can be obtained according to the equality relationship and the heat transfer rule in the heating process, and the relationship between the specific parameter sizes of the steam heating pipeline can be obtained through the calculation formula, so that the specific size of the steam heating pipeline can be selected and calculated on the basis of ensuring the heat exchange efficiency, the design process of the steam heating pipeline is simplified, the design test period of the steam heating pipeline is reduced to a certain extent, the design efficiency and the production efficiency are improved, and the production cost is reduced.

Specifically, in this embodiment, the heat flow q required for obtaining the blank is_{Need to}The method comprises obtaining the weight m of all blanks of the pulp forming die₁Weight m of all finished products of pulp forming die₂According to the water content m required to be evaporated when producing one mould of the pulp forming mould₁-m₂Obtaining the heat absorption quantity Q required by the pulp forming die when one die is produced; obtaining the drying time t to obtain the heat flow q of the blank_{Need to}Q/t. In this way, it is possible to facilitate accurate calculation to obtain the heat flow rate required by the blank in a unit time, and thus to facilitate accurate calculation from the heat flow rate required by the blank to obtain specific parameter values for the steam heating line.

In the embodiment, the condensation heat exchange quantity q between the steam in the steam heating pipeline and the pipe wall of the steam heating pipeline is obtained_Condensation The method comprises the following steps: obtaining the condensation heat exchange coefficient h of high-temperature dry saturated steam_Condensation According to the formula q_Condensation ＝πdLh_Condensation (T_{Steam generator}-T_Pipe) To obtain q_Condensation (ii) a Wherein d is the diameter of the steam heating pipeline, L is the total length of the steam heating pipeline, T steam is the temperature of saturated steam introduced into the steam heating pipeline, and T pipe is the wall temperature of the steam heating pipeline. By adopting the calculation method, the condensation heat exchange quantity between the steam in the steam heating pipeline and the pipe wall of the steam heating pipeline can be conveniently and accurately obtained, so that more accurate specific parameter values about the steam heating pipeline can be conveniently obtained subsequently.

Specifically, the heat transfer quantity q of the pipe wall of the steam heating pipeline transferred to the wall surface of the cavity is obtained_DieThe method comprises the following steps: according to the formulaTo obtain q_Die(ii) a Wherein, lambda is the heat conductivity coefficient of the material of the pulp forming mold, delta is the distance from the pipe wall of the steam heating pipeline to the wall surface of the cavity of the pulp forming mold, and the T cavity is the temperature of the wall surface of the cavity of the pulp forming mold in the steam heating process. By adopting the method, the heat transfer quantity transmitted from the pipe wall of the steam heating pipeline to the wall surface of the cavity can be conveniently and accurately obtained, so that more accurate specific parameter values about the steam heating pipeline can be conveniently obtained subsequently.

In this embodiment, the quantity q of heat exchange by evaporation between the walls of the cavity and the blank_{Evaporation of}The method comprises the following steps: according to the formula q_{Evaporation of}＝Ah_{Evaporation of}(T_Chamber-T_Blank) To obtain q_Die(ii) a Wherein A is the total surface area of the cavity, h_{Evaporation of}Heat transfer coefficient for evaporation of water from the blank, T_BlankThe temperature of the blank. By adopting the method, the evaporation heat exchange quantity between the wall surface of the cavity and the blank can be conveniently and accurately obtained, so that more accurate specific parameter values about the steam heating pipeline can be conveniently obtained subsequently.

In particular, according to q_Condensation Q is calculated_DieAnd q_{Evaporation of}Determining T_{Steam generator}Lambda, a, d, L and delta to establish a parametric calculation formula for the steam heating circuit. By adopting the calculation method, the specific parameter values of the steam heating pipeline can be further accurately obtained, so that the design efficiency is improved.

In the present embodiment, the pulp forming mold comprises a first mold plate 10 and a second mold plate 20, and the method of establishing the parameter calculation formula of the steam heating line comprises establishing the parameter calculation formula of the steam heating line of the first mold plate 10:

wherein λ is₁Is the thermal conductivity of the material of the first template 10, d₁Diameter of the steam heating line of the first form 10, delta₁Is the distance, L, between the wall of the steam heating line of the first die plate 10 and the wall of the cavity of the first die plate 10₁N molding cavities are arranged in the pulp molding die, and the inner surface areas of pulp tableware 30 produced by the n molding cavities are respectively A₁、A₂、...、A_n. By adopting the design method, accurate calculation can be conveniently carried out to obtain the specific parameter value of the steam heating pipeline of the first template 10, so that the design efficiency is improved, and the design production period is shortened.

In this embodiment, the pulp forming mould comprises a first mould plate 10 and a second mould plate 20, and the method of establishing the parameter calculation formula for the steam heating line comprises establishing the parameter calculation formula for the steam heating line of the second mould plate 20:

wherein λ is₂Is the thermal conductivity of the material of the first template 10, d₂Diameter of the steam heating line of the first form 10, delta₂Is the distance, L, between the wall of the steam heating line of the first die plate 10 and the wall of the cavity of the first die plate 10₂N molding cavities are arranged in the pulp molding die, and the inner surface areas of pulp tableware 30 produced by the n molding cavities are respectively A₁、A₂、...、A_n. By adopting the design method, accurate calculation can be conveniently carried out to obtain the specific parameter value of the steam heating pipeline of the second template 20, so that the design efficiency is improved, and the design production period is shortened.

Specifically, the temperature of the high-temperature saturated steam introduced into the steam heating pipeline is selected to be more than or equal to 140 ℃ in all the processes so as to ensure the production efficiency of the pulp forming mould of the forming machine.

The invention passes the theoryDerivation and experimental data verification find the rules and relations among the diameter of the steam heating pipeline, the total length of the steam heating pipeline, the distance between the wall of the steam pipe and the wall of the mold cavity, the surface area of the mold cavity, the temperature of the selected dry saturated steam and the thermal conductivity of the mold material, and fit a calculation method about the design of the steam heating pipeline to realize the rapid design of the steam heating pipeline in the steam heating mold. The pulp tableware steam mold 30 is composed of an upper second mold plate 20, the first mold plate 10 is shown in fig. 1, and the second mold plate 20 is shown in fig. 2. The first template 10 is made of metal material such as stainless steel and aluminum, and has a thermal conductivity of λ₁(ii) a The first template 10 cavity and the second template 20 cavity jointly form a forming cavity of the pulp tableware 30, and the forming cavity is used for placing a wet pulp tableware 30 blank for mould pressing and drying, and the number of the forming cavities is n; a steam heating pipeline of the first template 10, wherein the steam heating pipeline is arranged on the first template 10, high-temperature dry saturated steam is introduced to be used as a heating heat source to provide heat for drying the wet pulp tableware 30 blank, and the diameter of the steam heating pipeline is d₁The distance between the wall of the steam pipe and the wall of the cavity of the first template 10 is delta₁And the total length of the steam heating pipeline is L₁(ii) a The second template 20 is made of a metal material, such as stainless steel or aluminum, and has a thermal conductivity λ_{Lower part}(ii) a A steam heating pipeline of the second template 20, wherein the steam heating pipeline is arranged on the second template 20, high-temperature dry saturated steam is used as a heating heat source to provide heat for drying the wet pulp tableware 30 blank, and the diameter of the steam heating pipeline is d₂The distance between the wall of the steam pipe and the wall of the cavity of the first template 10 is delta₂And the total length of the steam heating pipeline is L₂。

Specifically, as shown in fig. 3, the pulp tableware 30 produced in this embodiment is divided into paper cups, paper bowls, paper lunch boxes, paper trays, paper butterflies, etc., and the shapes thereof may be circular, square, oval, etc., n molding cavities are designed in the steam mold, and the inner surface areas of the pulp tableware 30 produced by the n molding cavities are a₁、A₂、…、A_n。

The heat transfer process of the steam heating mould comprises condensation heat exchange between high-temperature dry saturated steam and a steam pipe wall, heat conduction from the steam pipe wall to a cavity wall, and evaporation heat exchange between the cavity wall and a wet pulp tableware 30 blank, wherein the high-temperature dry saturated steam is condensed into high-temperature saturated water in a steam heating pipeline to release latent heat of the steam, and the blank of the wet pulp tableware 30 is obtained.

According to the heat transfer rule and experimental data verification in the heating process of the steam heating mould, fitting the functional relation among the high-temperature dry saturated steam temperature, the mould material heat conductivity coefficient, the surface area of the paper pulp tableware 30, the steam heating pipeline parameters and the pipeline position, and establishing a steam heating pipeline design calculation method.

The steam heating pipeline design method is suitable for steam heating molds of paper cup, paper bowl, paper lunch box, paper plate, paper butterfly and other pulp tableware 30 forming machines, and the pulp tableware 30 can be round, square, oval and other shapes.

The temperature of the high-temperature dry saturated steam introduced into the steam heating pipeline is T_{Steam generator}The unit is temperature, and T is required to be met in order to ensure the production efficiency of the steam mold of the forming machine_{Steam generator}≥140℃。

Through theoretical derivation and experimental data verification, influence rules and relations among the high-temperature dry saturated steam temperature, the internal surface area of the paper pulp tableware 30, the heat conductivity coefficient of a mould material, the distance between the steam heating pipeline and the cavity, the diameter of the steam heating pipeline and the total length of the steam heating pipeline are obtained, the functional relation among all parameters is fitted, a steam heating pipeline design method is established, and the rapid design of the steam heating pipeline in the steam heating mould is realized.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the steam heating mould steam heating pipeline design method improves steam heating mould steam heating pipeline design efficiency, reduces mould testing and mould changing times, shortens mould development period, reduces mould development cost, guarantees heat exchange efficiency of high-temperature saturated steam in a pipeline in a heating process, meets heat absorption capacity requirements required by drying and forming of wet pulp tableware blanks, shortens drying time of the wet pulp tableware, and improves production efficiency.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.