A process for producing a composite seal

Abstract

The application discloses a composite sealing element production process, which comprises the following steps: S1, heating: turning on the power supply control switch of a double composite screw extruder, and then turning on a circulating water pump; when the water pressure reaches 2±0.5 kg, turning on the heating switch of the double composite screw extruder, preheating the first die head and the second die head, and preheating a microwave vulcanization furnace so that the temperature reaches a process temperature; S2, filling: filling sponge rubber into a hopper of the first die head and filling dense rubber into a hopper of the second die head; S3, die mounting: spraying a release agent on a composite extrusion die, mounting the die head and fixing the die head; S4, extruding: the sponge rubber is extruded from the first die head through one side core of the composite extrusion die, the dense rubber is extruded from the second die head through the side of the composite extrusion die and combined with the sponge rubber outside to form a composite layer, and finally the composite layer is extruded through the other side core of the composite extrusion die; and S5, microwave vulcanization: fully combining the sponge rubber with the dense rubber and improving the combination strength of the sponge rubber and the dense rubber.

Description

Technical Field

[0001] This invention relates to the field of sealing strip manufacturing technology, and in particular to a composite sealing component manufacturing process. Background Technology

[0002] Sealing strips are widely used, and their main functions include: 1) filling gaps; 2) absorbing and reducing vibration; 3) isolating noise and preventing water, dust, etc.; 4) providing a movement channel for moving parts; 5) compensating for manufacturing and assembly errors; and 6) reducing wind and rain noise.

[0003] Sealing strips can be made of a single material or composite materials, such as rubber sealing strips. Structurally, rubber sealing strips can be divided into two categories: one is pure rubber sealing strips, including sponge rubber sealing strips and solid rubber sealing strips; the other is composite rubber sealing strips, including various rubber composite sealing strips, metal skeleton and various rubber composite sealing strips, and rubber and plastic composite sealing strips.

[0004] Rubber sealing strips are extruded using a cold-feed extruder. Extruder heads include single-head, composite (double-composite and multi-composite) heads, and shear heads. Microwave vulcanizing extruders typically have a screw length-to-diameter ratio of 16, while shear head vulcanizing extruders have a screw length-to-diameter ratio greater than 20. The semi-finished rubber sealing strips extruded by the cold-feed extruder are vulcanized using a continuous vulcanization process. Vulcanization methods include microwave vulcanization, shear head vulcanization, salt bath vulcanization, fluidized bed vulcanization (also known as fluidized bed vulcanization, where the heating medium is 0.1-0.2 μm glass microspheres at 25°C), hot air vulcanization (only applicable to silicone rubber sealing strips), and high-speed hot air vulcanization (air velocity of 120 km / h at 40°C). High-speed hot air vulcanization suffers from slow heat transfer and high energy consumption (3 times that of microwave vulcanization heating equipment and 5 times that of shear head vulcanization equipment).

[0005] like Figure 1 As shown, there is a type of composite sealing strip made of sponge rubber and rubber with a rectangular cross-section. The rubber is bonded to three sides of the rectangular sponge rubber to form a three-sided composite sealing strip. This composite sealing strip is formed by extrusion using a cold-feed extruder and then microwave vulcanization. The existing production process causes the joint between the solid rubber and the sponge rubber to separate and fall off, resulting in sealing performance failure and reduced service life of the sealing strip. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems by providing a composite sealing component manufacturing process, and a composite extrusion manufacturing process for solid adhesive and sponge adhesive, which improves the bonding force between solid adhesive and sponge adhesive, and gives the sealing strip a longer service life and better sealing performance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a composite sealing component manufacturing process, comprising...

[0008] S1 Warm-up: Turn on the power control switch of the twin-screw extruder, then turn on the circulating water pump. When the water pressure reaches 2±0.5 kg, turn on the heating switch of the twin-screw extruder to preheat the first and second die heads, and at the same time preheat the microwave vulcanizing furnace to bring the temperature to the process temperature.

[0009] S2 filler: Sponge adhesive is filled into the hopper of the first head, and compacted adhesive is filled into the hopper of the second head;

[0010] S3 Mold Installation: Spray the composite extrusion die with release agent, install it into the die head, and secure it.

[0011] S4 Extrusion: The sponge adhesive is extruded from the first die head through one side of the core of the composite extrusion die, and the dense adhesive is extruded from the second die head through the side of the composite extrusion die and bonded to the outside of the sponge adhesive to form a composite layer, and finally extruded through the other side of the core of the composite extrusion die.

[0012] S5 Microwave Vulcanization: Vulcanization is carried out using a microwave vulcanization furnace with a microwave power of 4.5 ± 0.5 KW and a vulcanization temperature of 190~290℃;

[0013] S6 cooling: Water cooling is used, and air cooling is applied for drying;

[0014] S7 Cutting: Cutting is performed using a cutting machine according to the dimensions to be used.

[0015] To ensure that the rubber is bonded to the three sides of the rectangular sponge to form a three-sided composite sealing strip, a further preferred technical solution is that, in step S4, the composite extrusion die includes a feeding template, a composite template, and a forming template that are sequentially connected. The sponge rubber is extruded from the feeding cavity of the feeding template into the composite cavity of the composite template. At the same time, the solid rubber is extruded from the supply channels on a pair of sides of the composite template and the feeding template into the supply cavity and composite channel of the composite template. Then, under the extrusion action, the sealant is bonded to the sponge rubber through the notch on the side of the composite template near the forming template. The bonded sponge-solid rubber composite strip is extruded from the forming cavity of the forming template to form a composite sealing element with a rectangular cross-section of sponge rubber and solid rubber on three sides.

[0016] To further enhance the bonding between the sponge adhesive and the solid adhesive, a more preferred technical solution is that, in step S4, the screw extrusion rate corresponding to the first die head is 16.7±2 r / min, and the extrusion temperature is 35~60℃.

[0017] To further enhance the bonding between the sponge adhesive and the solid adhesive, a more preferred technical solution is that, in step S4, the screw extrusion rate corresponding to the second die head is 15.9±2 r / min, and the extrusion temperature is 35~60℃.

[0018] To improve the bonding strength between the sponge adhesive and the solid adhesive, a further preferred technical solution is that, in step S1, the microwave vulcanizing furnace adopts a four-section combined structure: the temperature of the first microwave vulcanizing furnace is 190-210℃, the temperature of the second microwave vulcanizing furnace is 250-270℃, the temperature of the third microwave vulcanizing furnace is 260-280℃, and the temperature of the fourth microwave vulcanizing furnace is 270-290℃.

[0019] To further enhance the bonding between the sponge adhesive and the solid adhesive, a more preferred technical solution is that, in step S5, the traction speed of the microwave vulcanizing furnace is 8.0 ± 1 r / min.

[0020] Compared with the prior art, the beneficial effects of the present invention are: by uniformly supplying the dense adhesive to the three sides of the composite cavity through the supply cavity and the composite flow channel, the supply pressure of the dense adhesive on the three sides of the composite cavity is uniform, so that the sponge adhesive and the dense adhesive are fully combined, thereby improving the bonding force between the sponge adhesive and the dense adhesive, and giving the sealing strip a longer service life and sealing performance. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the composite seal of the present invention;

[0022] Figure 2 This is an isometric view of the composite extrusion die assembly structure of the present invention;

[0023] Figure 3 This is an isometric view of the composite extrusion die separation structure of the present invention;

[0024] Figure 4 This is a partial enlarged view of the end face of the composite template of the present invention;

[0025] In the diagram: 10. Molding template; 11. Molding cavity; 20. Composite template; 21. Composite cavity; 22. Composite flow channel; 23. Supply cavity; 24. Notch; 30. Feeding template; 31. Feeding cavity; 40. Supply flow channel. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] Example 1

[0028] A composite seal manufacturing process, including

[0029] S1 Warm-up: Turn on the power control switch of the twin-screw extruder, then turn on the circulating water pump. When the water pressure reaches 2 kg, turn on the heating switch of the twin-screw extruder to preheat the first and second die heads, and at the same time preheat the microwave vulcanizing furnace to reach the process temperature. The microwave vulcanizing furnace adopts a four-section combined structure. The temperature of the first section microwave vulcanizing furnace is 200℃, the temperature of the second section microwave vulcanizing furnace is 260℃, the temperature of the third section microwave vulcanizing furnace is 270℃, and the temperature of the fourth section microwave vulcanizing furnace is 280℃.

[0030] S2 filler: Sponge adhesive is filled into the hopper of the first head, and compacted adhesive is filled into the hopper of the second head;

[0031] S3 Mold Installation: Spray the composite extrusion die with release agent, install it into the die head, and secure it.

[0032] S4 Extrusion: The screw extrusion rate corresponding to the first die head is 16.7 r / min, and the extrusion temperature is 45℃. The screw extrusion rate corresponding to the second die head is 15.9 r / min, and the extrusion temperature is 45℃. The sponge adhesive is extruded through one side of the core of the composite extrusion die from the first die head. The dense adhesive is extruded through the side of the composite extrusion die from the second die head and bonded to the outside of the sponge adhesive to form a composite layer. Finally, it is extruded through the other side of the core of the composite extrusion die.

[0033] S5 Microwave Vulcanization: Vulcanization is carried out using a microwave vulcanizing furnace with a microwave power of 4KW and a traction speed of 8.0r / min.

[0034] S6 cooling: Water cooling is used, and air cooling is applied for drying;

[0035] S7 Cutting: Cutting is performed using a cutting machine according to the dimensions to be used.

[0036] Example 2

[0037] A composite seal manufacturing process, including

[0038] S1 Warm-up: Turn on the power control switch of the twin-screw extruder, then turn on the circulating water pump. When the water pressure reaches 2 kg, turn on the heating switch of the twin-screw extruder to preheat the first and second die heads, and at the same time preheat the microwave vulcanizing furnace to reach the process temperature. The microwave vulcanizing furnace adopts a four-section combined structure. The temperature of the first section microwave vulcanizing furnace is 210℃, the temperature of the second section microwave vulcanizing furnace is 265℃, the temperature of the third section microwave vulcanizing furnace is 280℃, and the temperature of the fourth section microwave vulcanizing furnace is 285℃.

[0039] S2 filler: Sponge adhesive is filled into the hopper of the first head, and compacted adhesive is filled into the hopper of the second head;

[0040] S3 Mold Installation: Spray the composite extrusion die with release agent, install it into the die head, and secure it.

[0041] S4 Extrusion: The screw extrusion rate corresponding to the first die head is 16.5 r / min, and the extrusion temperature is 50℃. The screw extrusion rate corresponding to the second die head is 16 r / min, and the extrusion temperature is 50℃. The sponge adhesive is extruded through one side of the core of the composite extrusion die from the first die head. The dense adhesive is extruded through the side of the composite extrusion die from the second die head and bonded to the outside of the sponge adhesive to form a composite layer. Finally, it is extruded through the other side of the core of the composite extrusion die.

[0042] S5 Microwave Vulcanization: Vulcanization is carried out using a microwave vulcanizing furnace with a microwave power of 5KW and a traction speed of 8.3r / min.

[0043] S6 cooling: Water cooling is used, and air cooling is applied for drying;

[0044] S7 Cutting: Cutting is performed using a cutting machine according to the dimensions to be used.

[0045] like Figure 2-3 As shown, to ensure that the rubber is bonded to the three sides of the rectangular sponge to form a three-sided composite sealing strip, further, in step S4, the composite extrusion die includes a feeding template 30, a composite template 20, and a forming template 10 connected in sequence. The sponge rubber is extruded from the feeding cavity 31 of the feeding template 30 into the composite cavity 21 of the composite template 20. At the same time, the sealing adhesive is extruded from the supply channels 40 on a pair of sides of the composite template 20 and the feeding template 30 into the supply cavity 23 and the composite channel 22 of the composite template 20. Then, under the extrusion action, the sealing adhesive is bonded to the sponge rubber at the notch 24 on the side of the composite template 20 near the forming template 10. The bonded sponge-solid composite strip is extruded from the forming cavity 11 of the forming template 10 to form a composite sealing member with a rectangular cross-section of sponge rubber and solid adhesive on three sides.

[0046] like Figure 4As shown, the feed chamber 31 has an isosceles trapezoidal cross-section with a semi-circular arc protruding from the shorter side to the longer side. This shape allows the sponge rubber to expand and form the rectangular structure of the final product after vulcanization. The composite template 20 has a composite cavity 21 with the same cross-section as the feed chamber 31 and is connected to it. The molding template 10 has a molding cavity 11 with the same cross-section as the composite cavity 21 and is connected to it. The side of the composite template 20 near the molding template 10 has a dense rubber supply cavity 23 connected to the side corresponding to the longer side of the isosceles trapezoid of the composite cavity 21. The cross-section of the supply cavity 23 is an isosceles trapezoid and is symmetrically arranged with the composite cavity 21. The supply cavity 23 is far from the composite cavity 21. On one side of the composite template 20 of the cavity 21, there is an arc-shaped composite flow channel 22 that connects to a pair of sides corresponding to the isosceles trapezoidal sides of the composite cavity 21. On the pair of sides of the composite template 20 and the feeding template 30 that mate, there are dense adhesive supply channels 40. One end of the supply channel 40 opens on the outer surface of the composite template 20 and the feeding template 30, and the other end opens at the junction of the supply cavity 23 and the composite flow channel 22 away from the composite cavity 21, and connects to the bottom of the supply cavity 23 and the composite flow channel 22. That is, the side corresponding to the short side of the isosceles trapezoid of the supply cavity 23 connects to the junction of the composite flow channel 22. The supply channel 40 is interconnected, with one half of its opening connected to the bottom of the supply cavity 23 and the other half connected to the bottom of the composite channel 22. The supply cavity 23 and the composite channel 22 are separately disposed on the side of the composite template 20. This allows the dense adhesive to be supplied to both the supply cavity 23 and the composite channel 22 via the supply channel 40. Then, the supply cavity 23 supplies dense adhesive to one long side of the composite cavity 21, while the composite channel 22 supplies dense adhesive to a pair of waist sides of the composite cavity 21. The composite template 20 at the junction of the composite cavity 21 and the supply cavity 23 and composite channel 22 is close to the bottom of the composite template 20. The template 10 has a notch 24 on its side. The supply chamber 23 and the composite flow channel 22 are separately arranged on the side of the composite template 20. The notch 24 connects the composite cavity 21 with the supply chamber 23 and the composite flow channel 22. The solid adhesive combines with the sponge adhesive in the composite cavity 21 through the notches 24 on the three sides of the composite cavity 21 via the supply chamber 23 and the composite flow channel 22. By uniformly supplying the solid adhesive to the three sides of the composite cavity 21 through the supply chamber 23 and the composite flow channel 22, the supply pressure of the solid adhesive on the three sides of the composite cavity 21 is uniform, which makes the sponge adhesive and the solid adhesive fully bonded, improves the bonding force between the sponge adhesive and the solid adhesive, and gives the sealing strip a longer service life and sealing performance.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A manufacturing process for composite seals, characterized in that, include S1 Warm-up: Turn on the power control switch of the twin-screw extruder, then turn on the circulating water pump. When the water pressure reaches 2±0.5 kg, turn on the heating switch of the twin-screw extruder to preheat the first and second die heads, and at the same time preheat the microwave vulcanizing furnace to bring the temperature to the process temperature. S2 filler: Sponge adhesive is filled into the hopper of the first head, and compacted adhesive is filled into the hopper of the second head; S3 Mold Installation: Spray the composite extrusion die with release agent, install it into the die head, and secure it. S4 Extrusion: The sponge adhesive is extruded through one side core of the composite extrusion die by the first die head, and the dense adhesive is extruded through the side of the composite extrusion die by the second die head and bonded to the outside of the sponge adhesive to form a composite layer, and finally extruded through the other side core of the composite extrusion die; wherein, the composite extrusion die includes a feeding template, a composite template, and a forming template connected in sequence, the sponge adhesive is extruded into the composite cavity of the composite template through the feeding cavity of the feeding template, and at the same time, the dense adhesive is extruded into the supply cavity and composite channel of the composite template through a pair of supply channels on the sides of the composite template and the feeding template that cooperate with each other, the cross section of the supply cavity is an isosceles trapezoid and is symmetrically arranged with the composite cavity, and the side of the composite template away from the composite cavity of the supply cavity also has A composite flow channel with an arc shape is connected to a pair of sides corresponding to a pair of isosceles trapezoidal sides of the composite cavity. The composite template and the feeding template have a pair of sides with a supply channel for dense adhesive. One end of the supply channel is located on the outer side of the composite template and the feeding mold, and the other end of the supply channel is located at the junction of the supply cavity and the composite flow channel away from the composite cavity and is connected to the bottom of the composite cavity and the composite flow channel. Then, under the extrusion action, the sealant is combined with the sponge adhesive through the notch on the side of the composite template near the forming template. The combined sponge dense adhesive composite strip is extruded from the forming cavity of the forming template to form a composite seal with a rectangular cross-section of sponge adhesive and dense adhesive on three sides. S5 Microwave Vulcanization: Vulcanization is carried out using a microwave vulcanization furnace with a microwave power of 4.5±0.5KW and a vulcanization temperature of 190~290℃. S6 cooling: Water cooling is used, and air cooling is applied for drying; S7 Cutting: Cutting is performed using a cutting machine according to the dimensions to be used.

2. The composite seal manufacturing process according to claim 1, characterized in that, In step S4, the screw extrusion rate corresponding to the first die head is 16.7±2 r / min, and the extrusion temperature is 35~60℃.

3. The composite seal manufacturing process according to claim 1, characterized in that, In step S4, the screw extrusion rate corresponding to the second die head is 15.9±2 r / min, and the extrusion temperature is 35~60℃.

4. The composite seal manufacturing process according to claim 1, characterized in that, In step S1, the microwave vulcanizing furnace adopts a four-section combined structure. The temperature of the first microwave vulcanizing furnace is 190-210℃, the temperature of the second microwave vulcanizing furnace is 250-270℃, the temperature of the third microwave vulcanizing furnace is 260-280℃, and the temperature of the fourth microwave vulcanizing furnace is 270-290℃.

5. The composite seal manufacturing process according to claim 4, characterized in that, In step S5, the traction speed of the microwave vulcanizing furnace is 8.0 ± 1 r / min.

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