阅读说明：本技术 一种橡皮擦生产成型工艺 (Production and forming process of eraser ) 是由 璧靛己 赵强 于 2020-07-13 设计创作，主要内容包括：本发明公开一种橡皮擦生产成型工艺,包括以下步骤：准备配方、混合材料、得到橡皮擦原料、原料入模、烘道预热、上架等待成型和热压成型并冷却定型；本发明采用天然橡胶为基体材料配合氯乙烯树脂浆等材料制成,没有PVC成分,安全无毒,不会产生有毒气体,且配合负离子粉的加入,可以挥发出负离子,对人体健康有益,同时通过加入无机银抗菌材料和壳聚糖,提高产品整体的抗菌性能,避免细菌滋生,另外,通过浮石粉提高橡皮擦的硬性,通过硅溶胶和热稳定剂的效果,提高成品的耐水性、耐热性以及抗污能力,通过烘道预热、热压成型并冷却定型多步骤,进一步提到橡皮擦的耐受性能,橡皮擦不易开裂损坏,更加耐用。(The invention discloses an eraser production molding process, which comprises the following steps: preparing a formula, mixing materials to obtain an eraser raw material, putting the eraser raw material into a mold, preheating the eraser raw material in a drying tunnel, putting the eraser raw material on a shelf for forming, performing hot press forming, and cooling and shaping; the rubber eraser is prepared by adopting natural rubber as a base material and matching materials such as vinyl chloride resin slurry and the like, has no PVC component, is safe and non-toxic, can not generate toxic gas, can volatilize negative ions by matching with the addition of negative ion powder, is beneficial to the health of a human body, improves the integral antibacterial performance of the product by adding the inorganic silver antibacterial material and chitosan, avoids bacterial breeding, improves the hardness of the eraser by pumice powder, improves the water resistance, the heat resistance and the anti-fouling capability of the finished product by the effects of silica sol and a heat stabilizer, further improves the tolerance performance of the eraser by preheating, hot press molding and cooling and shaping multiple steps of a drying tunnel, and is not easy to crack and damage and more durable.)

1. The eraser production molding process is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: preparing the formulation

Weighing the following components in percentage by mass: 40-60 parts of natural rubber, 5-8 parts of anion powder, 5-10 parts of inorganic silver antibacterial material, 10-15 parts of pumice powder, 15-20 parts of vinyl chloride resin slurry, 3-5 parts of chitosan, 15-20 parts of nano titanium dioxide powder, 10-20 parts of silica sol, 10-15 parts of nano essence, 3-5 parts of calcium carbonate, 2-5 parts of heat stabilizer, 1-2 parts of tung oil and 30-40 parts of deionized water;

step two: mixed material

Placing natural rubber into an internal mixer for plasticating, discharging the natural rubber into a reaction kettle when the temperature reaches 100-110 ℃ after plasticating for 15-20min, simultaneously pouring vinyl chloride resin slurry, deionized water and silica sol into the reaction kettle, and mixing and stirring to obtain a mixed melt; putting the anion powder, the inorganic silver antibacterial material, the pumice powder, the chitosan, the nano titanium dioxide powder and the calcium carbonate into a high-speed ball mill for ball milling to obtain a ball milling mixture;

step three: obtaining the raw material of the eraser

Placing the ball-milled mixture and the mixed melt obtained in the step two into a reaction kettle, stirring and preserving heat until the ball-milled mixture is dissolved in the mixed melt, then adding nano essence, a heat stabilizer and tung oil into the reaction kettle, stirring and preserving heat to prepare an eraser raw material, and naturally cooling the eraser raw material to room temperature for preservation after the reaction is finished;

step four: raw material feeding into die

Pouring the eraser raw materials stored in the step three into a storage barrel, connecting an output end of the storage barrel with a conveying pipe to a conveying belt, simultaneously controlling an electromagnetic valve and a flow valve on the conveying pipe, setting discharge interval time and single discharge amount, starting the conveying belt, placing a mold on the conveying belt according to the discharge interval time, enabling the output end of the conveying pipe to face the mold, and equally discharging the eraser raw materials in the storage barrel into a plurality of molds;

step five: preheating of drying tunnel

Conveying the mold to a drying tunnel by a conveying belt, starting a heating pipe in the drying tunnel, controlling the heating temperature of the front section of the drying tunnel to be 60-80 ℃, preheating the rubber raw material in the mold, then controlling the heating temperature of the rear section of the drying tunnel to be 100 ℃, and evaporating the residual water on the rubber raw material;

step six: put on shelf and wait for shaping

Conveying a plurality of moulds filled with rubber raw materials to the other end along with conveying of the conveying belt, then placing the moulds on a multi-layer turnover frame, stacking the moulds orderly, and waiting for forming;

step seven: hot press forming and cooling shaping

The method comprises the steps of putting molds filled with rubber raw materials on a multi-layer turnover frame into a hot-pressing forming machine one by one, clamping the molds between an upper electric heating plate and a lower electric heating plate, starting the hot-pressing forming machine, applying pressure and controlling temperature under the intelligent constant temperature of the electric heating plates to obtain a formed object, transferring the formed object and the molds into a cooling machine for refrigeration, forming the formed object, and finally demolding to obtain the finished rubber product.

2. The eraser production molding process according to claim 1, characterized in that: in the first step, the heat stabilizer is one of zinc stearate and barium stearate, and the inorganic silver antibacterial material is one of silver zeolite powder and silver hydroxyapatite antibacterial powder.

3. The eraser production molding process according to claim 1, characterized in that: in the second step, when the vinyl chloride resin slurry, the deionized water and the silica sol are poured into the reaction kettle to mix the natural rubber, the natural rubber is mixed and stirred for 7-9min at the speed of 100-300 r/min, and the mixing temperature is controlled at 80-90 ℃.

4. The eraser production molding process according to claim 1, characterized in that: in the second step, the high-speed ball mill performs ball milling for 20-30min at the speed of 1000-.

5. The eraser production molding process according to claim 1, characterized in that: in the third step, the ball-milled mixture and the mixed melt are placed in a reaction kettle and stirred for 10-20min at the speed of 200-.

6. The eraser production molding process according to claim 1, characterized in that: in the third step, when the nano essence, the heat stabilizer and the tung oil are added into the reaction kettle, stirring is carried out for 6-10min at the speed of 350-450r/min, and heat preservation is carried out at the temperature of 120-140 ℃.

7. The eraser production molding process according to claim 1, characterized in that: in the fourth step, the discharge interval is set to be 1-3min, and the single discharge amount is set to be 600-.

8. The eraser production molding process according to claim 1, characterized in that: in the seventh step, in a hot-pressing forming machine, applying pressure of 0.8-1.2MPa to the rubber material in the mold, simultaneously controlling the temperature at 120-; and refrigerating in a cooling machine at 2-4 deg.C for 6-10min to shape the product.

Technical Field

The invention relates to the technical field of eraser production, in particular to an eraser production forming process.

Background

The eraser is made of rubber, can wipe off the trace of graphite or ink, has various types, shapes and colors, is a common fragrant eraser, is also a special art eraser with models of 2B, 4B, 6B and the like for drawing, can be a plastic eraser and the like;

at present, most of erasers are made of PVC materials, although the word eliminating rate of the erasers is obviously improved, PVC can emit toxic gas after high temperature, waste products which are difficult to degrade are difficult to treat, and harm is caused to human bodies, bacteria are easy to breed on the surface of the existing erasers after long-time use, and the existing erasers become bacterial hotbeds.

Disclosure of Invention

In view of the above problems, the invention aims to provide an eraser production and forming process, which improves the water resistance, heat resistance and stain resistance of a finished product, and is not easy to crack and damage and more durable.

In order to realize the purpose of the invention, the invention is realized by the following technical scheme: an eraser production molding process comprises the following steps:

the method comprises the following steps: preparing the formulation

Weighing the following components in percentage by mass: 40-60 parts of natural rubber, 5-8 parts of anion powder, 5-10 parts of inorganic silver antibacterial material, 10-15 parts of pumice powder, 15-20 parts of vinyl chloride resin slurry, 3-5 parts of chitosan, 15-20 parts of nano titanium dioxide powder, 10-20 parts of silica sol, 10-15 parts of nano essence, 3-5 parts of calcium carbonate, 2-5 parts of heat stabilizer, 1-2 parts of tung oil and 30-40 parts of deionized water;

step two: mixed material

Placing natural rubber into an internal mixer for plasticating, discharging the natural rubber into a reaction kettle when the temperature reaches 100-110 ℃ after plasticating for 15-20min, simultaneously pouring vinyl chloride resin slurry, deionized water and silica sol into the reaction kettle, and mixing and stirring to obtain a mixed melt; putting the anion powder, the inorganic silver antibacterial material, the pumice powder, the chitosan, the nano titanium dioxide powder and the calcium carbonate into a high-speed ball mill for ball milling to obtain a ball milling mixture;

step three: obtaining the raw material of the eraser

Placing the ball-milled mixture and the mixed melt obtained in the step two into a reaction kettle, stirring and preserving heat until the ball-milled mixture is dissolved in the mixed melt, then adding nano essence, a heat stabilizer and tung oil into the reaction kettle, stirring and preserving heat to prepare an eraser raw material, and naturally cooling the eraser raw material to room temperature for preservation after the reaction is finished;

step four: raw material feeding into die

Pouring the eraser raw materials stored in the step three into a storage barrel, connecting an output end of the storage barrel with a conveying pipe to a conveying belt, simultaneously controlling an electromagnetic valve and a flow valve on the conveying pipe, setting discharge interval time and single discharge amount, starting the conveying belt, placing a mold on the conveying belt according to the discharge interval time, enabling the output end of the conveying pipe to face the mold, and equally discharging the eraser raw materials in the storage barrel into a plurality of molds;

step five: preheating of drying tunnel

Conveying the mold to a drying tunnel by a conveying belt, starting a heating pipe in the drying tunnel, controlling the heating temperature of the front section of the drying tunnel to be 60-80 ℃, preheating the rubber raw material in the mold, then controlling the heating temperature of the rear section of the drying tunnel to be 100 ℃, and evaporating the residual water on the rubber raw material;

step six: put on shelf and wait for shaping

Conveying a plurality of moulds filled with rubber raw materials to the other end along with conveying of the conveying belt, then placing the moulds on a multi-layer turnover frame, stacking the moulds orderly, and waiting for forming;

step seven: hot press forming and cooling shaping

The method comprises the steps of putting molds filled with rubber raw materials on a multi-layer turnover frame into a hot-pressing forming machine one by one, clamping the molds between an upper electric heating plate and a lower electric heating plate, starting the hot-pressing forming machine, applying pressure and controlling temperature under the intelligent constant temperature of the electric heating plates to obtain a formed object, transferring the formed object and the molds into a cooling machine for refrigeration, forming the formed object, and finally demolding to obtain the finished rubber product.

The further improvement lies in that: in the first step, the heat stabilizer is one of zinc stearate and barium stearate, and the inorganic silver antibacterial material is one of silver zeolite powder and silver hydroxyapatite antibacterial powder.

The further improvement lies in that: in the second step, when the vinyl chloride resin slurry, the deionized water and the silica sol are poured into the reaction kettle to mix the natural rubber, the natural rubber is mixed and stirred for 7-9min at the speed of 100-300 r/min, and the mixing temperature is controlled at 80-90 ℃.

The further improvement lies in that: in the second step, the high-speed ball mill performs ball milling for 20-30min at the speed of 1000-.

The further improvement lies in that: in the third step, the ball-milled mixture and the mixed melt are placed in a reaction kettle and stirred for 10-20min at the speed of 200-.

The further improvement lies in that: in the third step, when the nano essence, the heat stabilizer and the tung oil are added into the reaction kettle, stirring is carried out for 6-10min at the speed of 350-450r/min, and heat preservation is carried out at the temperature of 120-140 ℃.

The further improvement lies in that: in the fourth step, the discharge interval is set to be 1-3min, and the single discharge amount is set to be 600-.

The further improvement lies in that: in the seventh step, in a hot-pressing forming machine, applying pressure of 0.8-1.2MPa to the rubber material in the mold, simultaneously controlling the temperature at 120-; and refrigerating in a cooling machine at 2-4 deg.C for 6-10min to shape the product.

The invention has the beneficial effects that: the invention is prepared by adopting natural rubber as a base material and matching materials such as vinyl chloride resin slurry and the like, has no PVC component, is safe and nontoxic, does not generate toxic gas, can volatilize anions by matching with the addition of anion powder, is beneficial to the health of human body, simultaneously improves the integral antibacterial performance of the product and avoids the breeding of bacteria by adding the inorganic silver antibacterial material and the chitosan, in addition, the hardness of the eraser is improved by the pumice powder, and the water resistance, the heat resistance and the anti-fouling capability of the finished product are improved by the effects of the silica sol and the heat stabilizer, through multiple steps of preheating in a drying tunnel, hot-press molding and cooling and shaping, the tolerance performance of the eraser is further improved, the eraser is not easy to crack and damage and is more durable, and finally, through the addition of the nano essence, the fragrance is volatilized, the effects of relaxing tension, relieving pressure and tranquilizing are achieved, and the functions are diversified.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.