Availability: | |
---|---|
Quantity: | |
Sleeve Compression Mold, also be known as also be known as Protective Cover Molding, Handle Cover Mould, Water Bottle Sleeve Moulding and Finger Sleeve Mold, mainly produce silicone protective sleeve that can isolate heat, water, dust and fall proof.
Sleeve Compression Mold's advantage is that it can form different sizes and complex parts. Moreover, compared with other methods such as transfer molding and injection molding, it is one of the lowest cost molding methods; In addition, it wastes relatively little material, which gives it an advantage when dealing with expensive compounds.
Sleeve Compression Mold's Structures
Sleeve Compression Mold includes Top-bottom Structure, Keel Structure and Transfer Structure.
Compression Mold of rubber provide a surplus of material to be placed in the cavity, in aim to all cavities filled. Once in place, the mold closes, applying heat and pressure to the rubber raw material and causing it to fill the cavity. When the cavity is filled, excess preformed material overflow chute. After this step, the rubber is then demolded.
The top-bottom structure has only the top plate and the bottom plate. The silicone raw material is placed in the cavity, and the product is formed by compression and heating of the plates.
This structure is suitable for short length silicone sleeve products, such as short water bottle protective sleeve. In this case, the parting line will be perfect and visible.
The keel structure not only has top plate and bottom plate, but also has a movable core.
The movable core of the automatic type is raised after the hot pressing is completed, and the formed product is directly demolded. The movable core of the manual type is usually relatively small, and the core is manually removed after the hot pressing is compeleted, and demolded in designated area. In this case, the parting line located on the side.
The syringe sleeve as shown in the figure adopts the transfer structure, which is composed of an ordinary keel structure and a transfer groove. The raw material is put into the goove, and then the keel is placed on the bottom plate. When the mold is closed, the raw material is flows into the bottom plate through the access of the groove and is heated to form.
This allows for more uniform wall thickness, smaller parting lines, and fewer raw edges
Compression Molded Sleeve Materials
EPDM Sleeve | Hardness: 30~90 |
Service temperature: -45℃~100℃ | |
Advantages: Excellent heat resistance, weather resistance and ozone resistance. Good water resistance, electrical insulation, resilience, low temperature. | |
Disadvantages: Poor air tightness, self-viscosity and mutual viscosity, not resistant to non-polar solutions. |
NR Sleeve | Hardness: 40~90 |
Service temperature: -55℃~70℃ | |
Advantages: Good elasticity, high strength, wear resistance. | |
Disadvantages: Not resistant to hydrocarbon oils, not suitable for environments requiring UV, oxygen and ozone resistance. |
NBR Sleeve | Hardness: 40~90 |
Normal Service temperature: -35℃~100℃ Low temperature resistance type: -55℃~100℃ High temperature resistance type: -30℃~125℃ (in the air); -30℃~150℃ (in the oil) | |
Advantages: Excellent resistance to oil and non-polar solvents, excellent bonding properties, good mechanical properties and air tightness. | |
Disadvantages: Weather resistance and ozone resistance is not strong. |
PVC Sleeve | Maximum operating temperature: 60℃ |
Advantages: Light material, waterproof, moisture-proof, flame retardant heat insulation | |
Disadvantages: Poor high temperature resistance |
TPR Sleeve | Maximum operating temperature: -40℃~120℃ |
Advantages: Odorless, environmentally friendly polymer material, good elongation and resilience. Free of heavy metals, plasticizers, EN71, ROHS and SVHC material. | |
Disadvantages: Poor aging resistance and hydrolysis resistance. Can't be used in the environment above 80℃ for a long time. Less wear resistance than TPU, but more silent. Heat resistance and permanent compression deformation are not as good as traditional rubber. |
TPU Sleeve | Maximum operating temperature: -40℃~120℃ |
Advantages: High tension, high toughness, high aging resistance. Oil, ozone, radiation and low temperature resistance. Excellent biocompatibility and blood compatibility. | |
Disadvantages: Resistant to strong polar solutions and strong acid-base media. High temperature resistance is average. |
Sleeve Compression Mold Surface Treatment
Sand blasting adopts compressed air as the power to form a high-speed jet beam to spray the material (copper ore, quartz sand, emery, iron sand) to the surface of the mold to be treated at high speed, remove the residual burrs and rust, and make the surface of the mold smoother. The surface requirements of different products are different, and sand of different thickness is used. At the same time, the mechanical properties of the workpiece surface are improved, the fatigue resistance of the workpiece is improved, the adhesion between it and the coating is increased, the durability of the coating is extended, and the flow and decoration of the coating are also beneficial.
The sand blasting method is simple, so the cost is low. However, if the mold surface is sandblasted twice or multiple times, the tool edge of the mold will be damaged, resulting in more rough edges and thicker parting lines.
In the process of using chemical liquid to corrode the mesh, the liquid soaks the mold for a fixed time chemical reaction, which is not affected by the surrounding environment. However, when the liquid corrodes the mesh, it needs to cover the non-texture area, which is difficult to operate. Moreover, the mesh life in the corrosion area of the liquid is relatively short, which can easily lead to the rapid scrapping of the mold core.
For the small mesh area that needs to be treated, there will be a dividing line between the mesh in different areas, so that the surface pattern of the product is inconsistent. In this case, chemical corrosion is suitable for products that need to form a large area of mesh.
EDM treatment is easy to operate, short time, high precision, suitable for small area of mesh processing. And the electrical spark hit out of the mesh is harder. Usually 5 Axis Machine is used for processing, so the cost of EDM is the highest.
Sleeve Compression Mold, also be known as also be known as Protective Cover Molding, Handle Cover Mould, Water Bottle Sleeve Moulding and Finger Sleeve Mold, mainly produce silicone protective sleeve that can isolate heat, water, dust and fall proof.
Sleeve Compression Mold's advantage is that it can form different sizes and complex parts. Moreover, compared with other methods such as transfer molding and injection molding, it is one of the lowest cost molding methods; In addition, it wastes relatively little material, which gives it an advantage when dealing with expensive compounds.
Sleeve Compression Mold's Structures
Sleeve Compression Mold includes Top-bottom Structure, Keel Structure and Transfer Structure.
Compression Mold of rubber provide a surplus of material to be placed in the cavity, in aim to all cavities filled. Once in place, the mold closes, applying heat and pressure to the rubber raw material and causing it to fill the cavity. When the cavity is filled, excess preformed material overflow chute. After this step, the rubber is then demolded.
The top-bottom structure has only the top plate and the bottom plate. The silicone raw material is placed in the cavity, and the product is formed by compression and heating of the plates.
This structure is suitable for short length silicone sleeve products, such as short water bottle protective sleeve. In this case, the parting line will be perfect and visible.
The keel structure not only has top plate and bottom plate, but also has a movable core.
The movable core of the automatic type is raised after the hot pressing is completed, and the formed product is directly demolded. The movable core of the manual type is usually relatively small, and the core is manually removed after the hot pressing is compeleted, and demolded in designated area. In this case, the parting line located on the side.
The syringe sleeve as shown in the figure adopts the transfer structure, which is composed of an ordinary keel structure and a transfer groove. The raw material is put into the goove, and then the keel is placed on the bottom plate. When the mold is closed, the raw material is flows into the bottom plate through the access of the groove and is heated to form.
This allows for more uniform wall thickness, smaller parting lines, and fewer raw edges
Compression Molded Sleeve Materials
EPDM Sleeve | Hardness: 30~90 |
Service temperature: -45℃~100℃ | |
Advantages: Excellent heat resistance, weather resistance and ozone resistance. Good water resistance, electrical insulation, resilience, low temperature. | |
Disadvantages: Poor air tightness, self-viscosity and mutual viscosity, not resistant to non-polar solutions. |
NR Sleeve | Hardness: 40~90 |
Service temperature: -55℃~70℃ | |
Advantages: Good elasticity, high strength, wear resistance. | |
Disadvantages: Not resistant to hydrocarbon oils, not suitable for environments requiring UV, oxygen and ozone resistance. |
NBR Sleeve | Hardness: 40~90 |
Normal Service temperature: -35℃~100℃ Low temperature resistance type: -55℃~100℃ High temperature resistance type: -30℃~125℃ (in the air); -30℃~150℃ (in the oil) | |
Advantages: Excellent resistance to oil and non-polar solvents, excellent bonding properties, good mechanical properties and air tightness. | |
Disadvantages: Weather resistance and ozone resistance is not strong. |
PVC Sleeve | Maximum operating temperature: 60℃ |
Advantages: Light material, waterproof, moisture-proof, flame retardant heat insulation | |
Disadvantages: Poor high temperature resistance |
TPR Sleeve | Maximum operating temperature: -40℃~120℃ |
Advantages: Odorless, environmentally friendly polymer material, good elongation and resilience. Free of heavy metals, plasticizers, EN71, ROHS and SVHC material. | |
Disadvantages: Poor aging resistance and hydrolysis resistance. Can't be used in the environment above 80℃ for a long time. Less wear resistance than TPU, but more silent. Heat resistance and permanent compression deformation are not as good as traditional rubber. |
TPU Sleeve | Maximum operating temperature: -40℃~120℃ |
Advantages: High tension, high toughness, high aging resistance. Oil, ozone, radiation and low temperature resistance. Excellent biocompatibility and blood compatibility. | |
Disadvantages: Resistant to strong polar solutions and strong acid-base media. High temperature resistance is average. |
Sleeve Compression Mold Surface Treatment
Sand blasting adopts compressed air as the power to form a high-speed jet beam to spray the material (copper ore, quartz sand, emery, iron sand) to the surface of the mold to be treated at high speed, remove the residual burrs and rust, and make the surface of the mold smoother. The surface requirements of different products are different, and sand of different thickness is used. At the same time, the mechanical properties of the workpiece surface are improved, the fatigue resistance of the workpiece is improved, the adhesion between it and the coating is increased, the durability of the coating is extended, and the flow and decoration of the coating are also beneficial.
The sand blasting method is simple, so the cost is low. However, if the mold surface is sandblasted twice or multiple times, the tool edge of the mold will be damaged, resulting in more rough edges and thicker parting lines.
In the process of using chemical liquid to corrode the mesh, the liquid soaks the mold for a fixed time chemical reaction, which is not affected by the surrounding environment. However, when the liquid corrodes the mesh, it needs to cover the non-texture area, which is difficult to operate. Moreover, the mesh life in the corrosion area of the liquid is relatively short, which can easily lead to the rapid scrapping of the mold core.
For the small mesh area that needs to be treated, there will be a dividing line between the mesh in different areas, so that the surface pattern of the product is inconsistent. In this case, chemical corrosion is suitable for products that need to form a large area of mesh.
EDM treatment is easy to operate, short time, high precision, suitable for small area of mesh processing. And the electrical spark hit out of the mesh is harder. Usually 5 Axis Machine is used for processing, so the cost of EDM is the highest.
Contact Us / Product Inquire / Liquid Injection Molding / LSR Molding / Article Inquire / FAQ / Download / Sign In / Register / Gallery / China Hot Products / Hot Products / Liquid Silicone Rubber Molding / Customized service / Request Quote / LSR Mold Design Guide / Liquid Silicone Rubber / Liquid Silicone Rubber Molding / Food Grade Liquid Silicone Rubber / Medical Grade Liquid Silicone Rubber / LSR Seal / Expo News / Industry News / Liquid Injection Molding - Better Silicone Project News / Silicone Materail Certifications / Silicone Umbrella Valves Drawing