阅读说明：本技术 一种橡胶膏剂的制备方法 (Preparation method of rubber paste ) 是由 刘克锋 于 2021-02-05 设计创作，主要内容包括：本发明公开了一种橡胶膏剂的制备方法,包括以下步骤：S1：使橡胶膏料在挤出机内受热软化后被挤出机挤出并经由管路推送给模具头,橡胶膏料在模具头口部被挤出成橡胶片材；S2：使背衬层从所述模具头口部经过以接收所述橡胶片材,得到橡胶膏剂。该橡胶膏剂的制备方法生产出的橡胶膏剂中橡胶膏料平整,厚薄分布均匀,色泽一致无色差,克重一致,橡胶膏剂杂质少,适合连续生产。(The invention discloses a preparation method of rubber paste, which comprises the following steps: s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: passing a backing layer from the die nose to receive the rubber sheet, resulting in a rubber paste. The rubber paste produced by the preparation method of the rubber paste is flat, uniform in thickness distribution, consistent in color and luster, free of color difference, consistent in gram weight, less in impurity of the rubber paste, and suitable for continuous production.)

1. The preparation method of the rubber paste is characterized by comprising the following steps:

s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: passing a backing layer from the die nose to receive the rubber sheet, resulting in a rubber paste.

2. The method of manufacturing a rubber paste as claimed in claim 1, wherein in step S1, said die head has an inlet, a sheet-shaped chamber and an elongated outlet, said inlet is connected to said pipe, a heating device is provided around said sheet-shaped chamber, said rubber paste fills said pipe and said sheet-shaped chamber when said rubber paste is manufactured, and said rubber paste is pushed by an extruder under the heating of said heating device to be extruded from said elongated outlet into a rubber sheet.

3. The method for preparing rubber paste according to claim 1, wherein when the backing layer is a release paper in step S2, there is further step S21, after the backing layer receives the rubber sheet and before the rubber paste is obtained: compounding the rubber sheet with elastic cloth.

4. The method for producing a rubber paste according to claim 1, 2 or 3, wherein in step S1, after the rubber paste is softened by heating in the extruder and extruded by the extruder, before being pushed to the die head through the piping, there is further step S11: filtering the rubber paste by a filtering device.

5. The method for producing a rubber paste according to claim 1 or 2, further comprising, before the step S1, a step S0: cutting the bulk rubber into slices by a rubber cutter, directly adding into a kneader, adding a softener, a tackifier, a filler and a medicine or a medicinal material extract, mixing and stirring together to prepare the rubber paste.

6. The method for preparing rubber paste according to claim 1, 2 or 3, wherein in the step S2, after the backing layer receives the rubber sheet and before the rubber paste is obtained, there is further a step S22: and detecting the thickness of the rubber sheet by a thickness detector.

7. The method for producing a rubber paste according to claim 6, further comprising step S3: the height of the elongated outlet of the die head and the extrusion amount of the extruder are adjusted based on the thickness detection result of step S22.

8. The method for producing rubber paste according to claim 6, wherein in step S2, after a thickness detector detects the thickness of the rubber sheet and before the rubber paste is obtained, there is further step S23: and cooling the rubber sheet and the back lining layer subjected to thickness detection by air cooling.

9. The method for producing rubber paste according to claim 6, wherein in step S2, after a thickness detector detects the thickness of the rubber sheet and before the rubber paste is obtained, there is further step S24: and cutting the rubber sheet subjected to the thickness detection and the backing layer.

Technical Field

The invention relates to the technical field of production processes of rubber paste, in particular to a preparation method of the rubber paste.

Background

The rubber paste is an external preparation which is prepared by mixing a medicament or a medicinal material extract with a matrix mainly comprising rubber and coating the mixture on a back lining layer. The existing rubber paste is generally prepared by taking silica gel paper or adhesive tape as a carrier, then uniformly coating a matrix mixture (hereinafter referred to as rubber paste) mainly comprising medicines or extracts of medicinal materials and rubber on the carrier, and further attaching a cover lining layer on the rubber paste to seal the rubber paste. At present, two main production methods of rubber paste are a solvent method and a hot pressing method, wherein the hot pressing method at least comprises the steps of preparing rubber paste through the procedures of breaking rubber, soaking rubber, mastication, refining, filtering, drying rubber and the like, and then placing the rubber paste on a coating device for coating rubber to prepare the rubber paste. Compared with a solvent method, the hot pressing method for producing the rubber paste has the advantages of safety, environmental protection, small occupied area, high production efficiency and the like, but the following defects still exist in the gluing link: although the existing gluing device has a heating function, the heat conduction of the rubber paste is slow, so that the whole body is heated unevenly, a temperature gradient exists, meanwhile, the gluing device is exposed to enable the upper layer of the rubber paste to be easily cooled and hardened, the factors can obviously influence the viscosity of the rubber paste, the viscosity is uniform, the glue discharging speed and the gluing speed fluctuate due to the viscosity difference, the thickness of the rubber paste is finally influenced, and the gram weights of the rubber paste and a back lining layer are inconsistent and are not standard; the rubber paste is placed in a gluing device and a glue baking link exists before, so that on one hand, the medicine is volatilized due to glue baking, on the other hand, the external glue is changed in color due to heat transfer from outside to inside and poor heat conduction of the rubber, and color difference occurs during gluing; when the rubber is coated, the base fabric takes away the rubber paste through friction force, and for the situation that the release paper is used as the base fabric, the rubber paste is difficult to coat due to too small friction force, so that the rubber paste for manufacturing the elastic cloth is difficult to coat (if the rubber paste for manufacturing the base fabric by using the elastic cloth is not suitable for being directly coated with the rubber as the base fabric because the elastic cloth is stretched and deformed, the elastic cloth needs to be coated on the release paper firstly and then compounded with the elastic cloth); in addition, because the upper part of the gluing device is exposed and contacted with the external environment, the temperature is not controlled well, the weight of the glued glue is directly influenced, and impurities are easy to mix. Meanwhile, the rubber paste is usually in a national standard, which requires that production equipment must be cleaned in each production batch of the rubber paste, and this poses a great challenge on whether the production equipment is easy to clean. The invention patent application CN104873480A discloses a method for producing rubber paste by a hot pressing method, which comprises the steps of preparing rubber paste sizing material in a kneader, adding the rubber material into a screw extruder provided with a filter screen, directly feeding the rubber paste material into a coating plate of a front vehicle of a coating machine after discharging, and coating the rubber paste material on a backing material to produce the rubber paste. The utility model patent CN211542745U discloses a rubber paste pressure coating machine is equipped with rubber paste hot shop mechanism, and this mechanism includes stripper plate and squeeze roll, the two inside integrated heater block, puts into hot shop mechanism with the rubber paste, and the squeeze roll rotates and is along with the extrusion of stripper plate, is the thin pancake form and tiling on the drive belt surface with the rubber paste extrusion, drives by the drive belt and gos forward and drop under the hot-blast effect and the backer bonding. Because of opening between stripper plate and the squeeze roll is the circular that the radius is unanimous by oneself, the extrusion propelling movement effect of squeeze roll to rubber cream after rubber is heated and is melted is very limited, and rubber cream still mainly relies on the viscosity of self to flow out from the gap of stripper plate, consequently still exists because heat-conduction is inhomogeneous or the upper strata receives cold etc. and leads to the change of viscosity and finally makes the inhomogeneous drawback of coating.

Disclosure of Invention

The invention aims to provide a preparation method of rubber paste, and the rubber paste produced by the preparation method of the rubber paste is flat, uniform in thickness distribution, uniform in color and luster, free of color difference, uniform in gram weight, less in impurity of the rubber paste, and suitable for continuous production.

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

the preparation method of the rubber paste is characterized by comprising the following steps:

s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: passing a backing layer from the die nose to receive the rubber sheet, resulting in a rubber paste.

In step S1, the die head has an inlet, a sheet-shaped chamber and an elongated outlet, the inlet is connected to the pipe, a heating device is disposed around the sheet-shaped chamber, the pipe and the sheet-shaped chamber are filled with the rubber paste when the rubber paste is prepared, and the rubber paste is pushed by the extruder under the heating of the heating device and extruded into a rubber sheet from the elongated outlet.

When the backing layer is a release paper in the step S2, there is also a step S21 after the backing layer receives the rubber sheet and before the rubber paste is obtained: compounding the rubber sheet with elastic cloth.

In the step S1, after the rubber paste is softened by heating in the extruder and extruded by the extruder, before being pushed to the die head through the pipeline, there is a step S11: filtering the rubber paste by a filtering device.

Step S0 is further included before the step S1: cutting the bulk rubber into slices by a rubber cutter, directly adding into a kneader, adding a softener, a tackifier, a filler and a medicine or a medicinal material extract, mixing and stirring together to prepare the rubber paste.

In the step S2, after the backing layer receives the rubber sheet and before the rubber paste is obtained, there is also a step S22: and detecting the thickness of the rubber sheet by a thickness detector.

Further comprising step S3: the height of the elongated outlet of the die head and the extrusion amount of the extruder are adjusted based on the thickness detection result of step S22.

In the step S2, after the thickness detector detects the thickness of the rubber sheet and before the rubber paste is obtained, there is further a step S23: and cooling the rubber sheet and the back lining layer subjected to thickness detection by air cooling.

In the step S2, after the thickness detector detects the thickness of the rubber sheet and before the rubber paste is obtained, there is further a step S24: and cutting the rubber sheet subjected to the thickness detection and the backing layer.

In the invention, the extruder, the filtering device, the pipeline and the die head are connected into a closed system, so that the rubber paste is heated and softened in the extruder, filtered and directly discharged into the pipeline which is connected in a sealing way, and then discharged into the die head which is connected in a sealing way through the pipeline, the rubber paste is heated in the die head to form a sheet shape and extruded from a slender outlet, the power for extruding the rubber paste is directly provided by the extruder, the extruded thickness is directly controlled through the size of the opening part of the die head, and the extruder provides sufficient extruding force as the extruder is filled with the rubber paste to the opening part of the die head, so that the extruding speed and the thickness are not related to the viscosity of the rubber paste any more, namely, no matter whether the rubber paste is heated uniformly in the die head or not and the viscosity has some difference or not, compared with the sufficient extruding force of the extruder and the small size of the opening part, the extruding speed and the thickness cannot become factors influencing the extruding, thereby ensuring that the thickness of the rubber paste is uniform and consistent, the gram weight is uniform, and the rubber paste is beneficial to the continuous production of the rubber paste. Meanwhile, due to the arrangement of the die head sheet-shaped cavity and the heating device, a thin layer of rubber paste is easier to be heated uniformly, the viscosity tends to be consistent, and the problem that the paste on the upper layer is hardened by cooling can be avoided, so that the gluing quality and the gluing color are consistent and have no color difference; meanwhile, the filter screen in the filter device is easy to draw out and replace, so that the extruder and the pipeline are easy to disconnect, the rubber paste in the extruder and the pipeline is convenient to draw out, and the aim of cleaning is fulfilled. The invention adopts a mode that the rubber paste is extruded and then directly received by the back lining layer, and the combination is basically not influenced by the friction force between the back lining layer and the rubber paste, so even smooth release paper can be paved with even rubber paste, thereby creating conditions for compounding with elastic cloth again and manufacturing the elastic cloth type rubber paste, and leading the invention to have the function of coating the elastic cloth type rubber paste. The invention cancels the procedures of rubber breaking, rubber soaking, mastication, refining, filtering, rubber drying and the like, and the method comprises the steps of cutting a large piece of rubber into slices by a rubber cutter, directly adding the slices into a kneading machine, adding a softening agent, a tackifier, a filling agent and a medicine or medicinal material extract, mixing and stirring together to prepare the rubber paste, so that the preparation procedures of the rubber paste are greatly reduced, and the preparation time is greatly shortened; in addition, before the rubber paste is rolled, the distribution condition and the flatness of the rubber paste are detected on line in real time through a thickness detector, and the size of the opening of the die head is adjusted in a targeted manner according to the detection result, so that the thickness of the rubber paste is uniform, and the gram weight is uniform.

Drawings

FIG. 1 is a perspective view of an apparatus (without a cooling air unit) used in the present invention;

FIG. 2 is a schematic front view of an apparatus (not including a cooling air unit) used in the present invention;

FIG. 3 is a perspective view of the apparatus (including the cooling air unit) used in the present invention.

Detailed Description

Example 1

A preparation method of rubber paste comprises the following steps:

s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: the backing layer is passed through the die head mouth to receive the rubber sheet, resulting in a rubber paste.

In step S1, as shown in fig. 1, 2 and 3, the extruder 10 and the die head 20 are hermetically connected through the pipeline 40, and when the rubber paste is added into the extruder 10, the extruder 10 heats and softens the rubber paste and extrudes the rubber paste to the die head 20, and then extrudes the rubber paste from the mouth of the die head 20 to form a rubber sheet; at the same time, the backing layer conveyed by the backing fabric conveyor 30 receives the rubber sheet to form the rubber paste agent. In this embodiment, the extruder 10 is a screw extruder, the die head 20 includes an inlet, a sheet-shaped chamber for facilitating uniform outflow of the rubber paste, and an elongated outlet for forming, and a heating device is provided around the sheet-shaped chamber to hermetically connect the inlet with the screw extruder or via a pipe 40. The height of the outlet of the die head 20 is adjustable to adapt to the production and processing of rubber paste with different thicknesses; the screw extruder comprises a driving device 11, a screw rod connected with the driving device 11, a cavity and a heating module, wherein the screw rod is inserted into the cavity and rotates along with the driving device 11 to realize continuous, timing and quantitative pushing of the rubber paste, the screw rod can be a single screw rod or a double screw rod with stronger propelling force and more accurate pushing amount, and the heating module ensures that the rubber paste is in a softening state before entering the die head 20 from the extruder 10. Thus, the extruder 10 and the die head 20 are connected to form a closed system through the pipeline 40, so that the rubber paste is heated and softened in the extruder 10 and directly discharged into the hermetically connected pipeline 40, and then discharged into the hermetically connected die head 20 through the pipeline 40, and heated in the die head 20 to form a sheet shape and extruded from a slender outlet, so that the power for extruding the rubber paste is directly provided by the extruder 10, the extruded thickness is directly controlled by the outlet size of the die head 20, and since the extruder 10 is filled with the rubber paste to the outlet of the die head 20, the extruder 10 provides sufficient extruding force, so that the extruding speed and thickness are no longer related to the viscosity of the rubber paste, i.e. no matter whether the rubber paste is heated uniformly in the die head 20 or not and whether the viscosity is different, compared with the sufficient extruding force of the extruder 10 and the small mouth size, the extruding speed and the thickness cannot become factors influencing the extruding, thereby the thickness of the glue is uniform and the gram weight is uniform. Simultaneously, because the setting of 20 slice cavities of mould head and heating device makes thin one deck rubber paste materials be heated evenly more easily, and the consistency trend is unanimous, also can not appear in addition with the problem that upper rubber paste materials hardened by the cold, this further provides the guarantee to the unanimous chromatic aberration of rubber coating quality and rubber coating color and luster. Since the rubber paste is extruded from the outlet of the die head 20 and then directly received by the backing layer, the combination mode is basically not affected by the friction force between the backing layer and the rubber paste, even a smooth release paper can be paved with even rubber paste, thereby creating conditions for compounding with the elastic cloth again to manufacture the rubber paste agent of the elastic cloth type, and having the function of coating the rubber paste agent of the elastic cloth type.

Example 2

A preparation method of a rubber paste agent comprises the following steps:

s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: passing the backing layer through the die head mouth to receive the rubber sheet;

s21: and compounding the rubber sheet with elastic cloth to obtain the rubber paste.

In this embodiment, the backing layer may be release paper, and the base fabric conveying device 30 includes a first unwinding mechanism 31, a supporting roller 32 and a winding mechanism 33 for storing and conveying the base fabric, wherein the winding mechanism 33 collects the backing layer released by the first unwinding mechanism 31, and the supporting roller 32 is disposed at the outlet of the die head 20 and supports the backing layer so that the backing layer can receive the rubber patch more stably. Meanwhile, the second unwinding mechanism 70 stores and releases the elastic cloth to the pressing mechanism 80, and the pressing mechanism 80 is provided with a pressing roller 81 and a pressing matching roller 82, so that the back layer and the elastic cloth are compounded on the rubber paste through the pressing mechanism 80, and the adhesive force between the back layer and the elastic cloth and the rubber paste is increased.

Example 3

A preparation method of a rubber paste agent comprises the following steps:

s1: heating and softening the rubber paste in an extruder, and extruding by the extruder;

s11: filtering the rubber paste by a filtering device, pushing the rubber paste to the die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: the backing layer is passed through the die head mouth to receive the rubber sheet, resulting in a rubber paste.

Like this, rubber cream material is extruded to filter equipment 50 by extruder 10 earlier, is extruded to die head 20 again after filtering through filter equipment 50 again, avoids great impurity to get into die head 20, causes die head 20 to block up. The filter device 50 can adopt a screen changer with a detachable filter screen, so that the filter screen is more simple and convenient to change; meanwhile, the filter screen in the filter device 50 is easy to draw out and replace, so that the extruder 10 and the pipeline 40 are easy to disconnect, the rubber paste in the extruder 40 and the pipeline 40 is convenient to draw out, and the purpose of cleaning is achieved.

Example 4

A preparation method of a rubber paste agent comprises the following steps:

s0: cutting the bulk rubber into slices by a rubber cutter, directly adding into a kneader, adding a softener, a tackifier, a filler and a medicine or a medicinal material extract, mixing and stirring together to prepare the rubber paste.

S1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: the backing layer is passed through the die head mouth to receive the rubber sheet, resulting in a rubber paste.

The invention cancels the procedures of rubber breaking, rubber soaking, mastication, refining, filtering, rubber drying and the like, a large piece of rubber is cut into slices by a rubber cutter and then is directly added into a kneading machine, and then a softening agent, a tackifier, a filling agent and a medicament or medicinal material extract are added and mixed together to prepare the rubber paste, and the rubber paste can be added into an extruder 10, thereby realizing the continuous production of the rubber paste, greatly reducing the preparation procedures of the rubber paste and greatly shortening the preparation time.

Example 5

A preparation method of a rubber paste agent comprises the following steps:

s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: passing a backing layer from a die head mouth to receive the rubber sheet;

s22: detecting the thickness of the rubber sheet by a thickness detector to obtain rubber paste;

s3: the height of the elongated outlet of the die head and the extrusion amount of the extruder are adjusted based on the thickness detection result of step S22.

In this embodiment, the thickness detector 60 is additionally arranged between the winding mechanism 33 and the supporting roller 32, the distribution and flatness of the rubber paste on the base fabric are detected on line in real time by the thickness detector 60, and the outlet height of the die head 20 and the extrusion amount of the extruder are adjusted in a targeted manner by data fed back by the thickness detector 60, so that the gram weight uniformity and the processing quality of the rubber paste are further improved.

Example 6

A preparation method of a rubber paste agent comprises the following steps:

s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: passing a backing layer from a die head mouth to receive the rubber sheet;

s22: detecting the thickness of the rubber sheet by a thickness detector;

s23: and cooling the rubber sheet and the back lining layer subjected to thickness detection in an air cooling manner to obtain the rubber paste.

The winding mechanism 33 can be arranged movably, the movable cooling air group 100 is additionally arranged between the winding mechanism 33 and the supporting roller 32, the cooling air group 100 comprises a plurality of cooling fans, and the cooling air group 100 can be movably arranged between the winding mechanism 33 and the supporting roller 32 by adopting a frame structure with pulleys at the bottom, so that the distance between the winding mechanism 33 and the supporting roller 32 is adjustable. The cooling air set 100 is opened to cool the rubber paste, so that the rubber paste is prevented from being too high in temperature, and the rubber paste is not easy to dissipate heat after being rolled, and the processing quality of the rubber paste is further influenced; when the cooling air flow group 100 is not needed, the cooling air flow group 100 may be slid out from between the winding mechanism 33 and the support roller 32.

Example 6

A preparation method of a rubber paste agent comprises the following steps:

s1: heating and softening the rubber paste in an extruder, extruding the rubber paste by the extruder, pushing the rubber paste to a die head through a pipeline, and extruding the rubber paste into a rubber sheet at the opening part of the die head; s2: passing a backing layer from a die head mouth to receive the rubber sheet;

s22: detecting the thickness of the rubber sheet by a thickness detector;

s23: cooling the rubber sheet and the back lining layer after thickness detection by air cooling;

s24: and (3) slitting the rubber sheet subjected to thickness detection and/or air cooling and the back lining layer to obtain the rubber paste.

In this embodiment, the slitting mechanism 90 is used to slit the rubber sheet and the backing layer after thickness detection and/or air cooling, and the winding mechanism 33 is used to wind and store the slit rubber paste.

The embodiment is only for explaining the conception and the implementation of the invention, and does not limit the same, and the technical solution without substantial change is still in the protection scope under the conception of the invention.