Composite membrane having stable friction coefficient and capable of being spurted with codes and preparation method of composite membrane

Abstract

The invention discloses a composite film with a stable friction coefficient and which can be coded. It includes an outer layer, a barrier layer and a polyethylene co-extrusion film layer from the outside to the inside, and the polyethylene co-extrusion film layer includes a corona treatment layer from the outside to the inside. , a core layer and a heat-sealing layer. The material composition of the heat-sealing layer mainly includes polyethylene resin and a slip agent. The slip agent is a silicone slip agent masterbatch with polyethylene as a carrier. In the present invention, silicone slippery agent is added to the polyethylene co-extrusion film heat-sealing layer located inside the film, and it is extruded to the surface and evenly distributed during processing by utilizing its incompatibility with the main material to achieve The purpose of reducing the friction coefficient, and the molecular weight is large. Under the high temperature conditions during the film aging, storage and use, the silicone resin with low surface energy will not migrate and precipitate, and improve the stability of the friction coefficient of the inner surface of the film. Unwinding The speed meets the requirements of high-speed packaging machines. The invention discloses a method for preparing a composite film suitable for stable friction coefficient and capable of coding.

Description

technical field

[0001] The invention relates to the technical field of pharmaceutical packaging composite materials, and specifically relates to a composite film with a stable friction coefficient and which can be coded and a preparation method thereof. Background technique

[0002] There are many types of packaging machines in the prior art, the degree of automation is getting higher and higher, and the packaging speed is getting faster and faster, so the requirements for flexible packaging composite films are getting higher and higher. The composite film for high-speed automatic packaging needs to have good smoothness to ensure that it can be packaged smoothly on the high-speed automatic filling machine. Therefore, the dynamic and static friction coefficient of the film surface should be relatively low, generally between 0.1 and 0.3. The slipperiness of the film is achieved by adding a slip agent. After the film is formed, the conventional erucamide slip agent migrates to ...

Examples

Embodiment 1

[0027] Such as figure 1 As shown, the friction coefficient of Example 1 is stable and the composite film that can be coded is composed of outer layer 1 (PET polyester film), polyurethane adhesive layer 4, barrier layer 2 (aluminum foil), polyurethane adhesive layer 4, Polyethylene co-extrusion film layer 3, polyethylene co-extrusion film layer 3 includes corona treatment layer 31, core layer 32, heat sealing layer 33 from outside to inside; corona treatment layer, core layer and heat sealing layer are blown film co-extruded. The thickness of the polyethylene co-extruded film layer is 50 μm; the thickness of the outer layer 1 PET polyester film is 12 μm, and the thickness of the barrier layer is 7 μm.

[0028] Embodiment 1 is not through printing, and preparation process is:

[0029] S1: Preparation of polyethylene co-extruded film layer, the components of each layer are configured according to the proportion, and the composition of the heat seal layer contains silicone slip ...

Embodiment 2

[0033] Such as figure 2As shown, the difference between Example 2 and Example 1 is that in the composition of the heat-sealing layer, the weight percentage of the slip agent is 4.5%, the weight percentage of the inorganic anti-blocking agent silicon dioxide is 0.5%, and the rest is linear low-density polystyrene. A blend of ethylene and low-density polyethylene, the weight percent of linear low-density polyethylene in the polyethylene resin is 34%, and the mixing ratio of linear low-density polyethylene and low-density polyethylene in the corona treatment layer and core layer is the same as that of the heat-sealing layer The outer layer is a PET polyester printing film, and the ink used is an alcohol-soluble ink. The PET polyester printing film includes a PET polyester film and an ink layer 5 from the outside to the inside.

[0034] The difference in preparation process is:

[0035] First, the printing process of PET polyester film, in the case of 50-60 ° C, use alcohol-solu...

Embodiment 3

[0038] The difference between Example 3 and Example 2 is: in the composition of the heat-sealing layer, the percentage by weight of the slippery agent is 10%, the percentage by weight of the inorganic anti-blocking agent silicon dioxide is 2%, and the linear low-density polyethylene in the polyethylene resin The weight percentage is 67%; the mixing ratio of linear low-density polyethylene and low-density polyethylene in the corona treatment layer and the core layer is the same as that of the heat-sealing layer.

[0039] The difference in preparation process is:

[0040] The coating amount of polyurethane two-component dry composite glue is 3.25gsm, the composite tension is controlled at 35%, the curing temperature of the composite film is 45°C, and the curing time is 48h.

technical field

[0001] The invention relates to the technical field of pharmaceutical packaging composite materials, and specifically relates to a composite film with a stable friction coefficient and which can be coded and a preparation method thereof. Background technique

[0002] There are many types of packaging machines in the prior art, the degree of automation is getting higher and higher, and the packaging speed is getting faster and faster, so the requirements for flexible packaging composite films are getting higher and higher. The composite film for high-speed automatic packaging needs to have good smoothness to ensure that it can be packaged smoothly on the high-speed automatic filling machine. Therefore, the dynamic and static friction coefficient of the film surface should be relatively low, generally between 0.1 and 0.3. The slipperiness of the film is achieved by adding a slip agent. After the film is formed, the conventional erucamide slip agent migrates to ...

Examples

Embodiment 1

[0027] Such as figure 1 As shown, the friction coefficient of Example 1 is stable and the composite film that can be coded is composed of outer layer 1 (PET polyester film), polyurethane adhesive layer 4, barrier layer 2 (aluminum foil), polyurethane adhesive layer 4, Polyethylene co-extrusion film layer 3, polyethylene co-extrusion film layer 3 includes corona treatment layer 31, core layer 32, heat sealing layer 33 from outside to inside; corona treatment layer, core layer and heat sealing layer are blown film co-extruded. The thickness of the polyethylene co-extruded film layer is 50 μm; the thickness of the outer layer 1 PET polyester film is 12 μm, and the thickness of the barrier layer is 7 μm.

[0028] Embodiment 1 is not through printing, and preparation process is:

[0029] S1: Preparation of polyethylene co-extruded film layer, the components of each layer are configured according to the proportion, and the composition of the heat seal layer contains silicone slip ...

Embodiment 2

[0033] Such as figure 2As shown, the difference between Example 2 and Example 1 is that in the composition of the heat-sealing layer, the weight percentage of the slip agent is 4.5%, the weight percentage of the inorganic anti-blocking agent silicon dioxide is 0.5%, and the rest is linear low-density polystyrene. A blend of ethylene and low-density polyethylene, the weight percent of linear low-density polyethylene in the polyethylene resin is 34%, and the mixing ratio of linear low-density polyethylene and low-density polyethylene in the corona treatment layer and core layer is the same as that of the heat-sealing layer The outer layer is a PET polyester printing film, and the ink used is an alcohol-soluble ink. The PET polyester printing film includes a PET polyester film and an ink layer 5 from the outside to the inside.

[0034] The difference in preparation process is:

[0035] First, the printing process of PET polyester film, in the case of 50-60 ° C, use alcohol-solu...

Embodiment 3

[0038] The difference between Example 3 and Example 2 is: in the composition of the heat-sealing layer, the percentage by weight of the slippery agent is 10%, the percentage by weight of the inorganic anti-blocking agent silicon dioxide is 2%, and the linear low-density polyethylene in the polyethylene resin The weight percentage is 67%; the mixing ratio of linear low-density polyethylene and low-density polyethylene in the corona treatment layer and the core layer is the same as that of the heat-sealing layer.

[0039] The difference in preparation process is:

[0040] The coating amount of polyurethane two-component dry composite glue is 3.25gsm, the composite tension is controlled at 35%, the curing temperature of the composite film is 45°C, and the curing time is 48h.

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