Thermal shrinkage film and manufacturing method thereof
By using components such as polyethylene terephthalate and specific manufacturing methods in the heat shrink film, the problem of secondary shrinkage of the heat shrink film at high temperature or high humidity is solved, ensuring the stability and reliability of the product. It is applicable In a variety of applications.
Patent Information
- Application Number
- CN202411636267.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-01-07
AI Technical Summary
Existing heat-shrinking films are prone to secondary shrinkage or bubbles at high temperatures or high humidity, damaging the coated products, such as glass lamps, and affecting the luminous effect and spectrum.
The combination of polyethylene terephthalate, stabilizer, lubricant, toughener, light diffuser and pigment is adopted, with a mass ratio of 83%~93%, 0.1%~1%, 0.1%~3%, 6 %~13%, 0.3%~3%, 0.5%~2%, through the production methods of drying, extrusion forming, water-cooled cooling, preheating stretching and air-cooled cooling, ensure that the heat shrink film does not produce a second time after shrinkage. Shrink or bubble.
It realizes that the heat shrink film does not cause secondary shrinkage or bubble after shrinkage, prevents damage to the luminous effect and spectrum of the coated product, improves the reliability and stability of the heat shrink film, is suitable for various products, and does not increase the cost. .
Smart Images
Figure CN119264615A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a heat shrinkable film and also to a method for manufacturing the heat shrinkable film. Background Art
[0002] Heat shrink film is a common multifunctional film that can be used in the sale and transportation of various products to protect these products. Therefore, heat shrink film has a wide range of applications.
[0003] However, the existing heat shrink film is prone to secondary shrinkage or blistering under high temperature or high humidity after shrinkage (the secondary shrinkage of the heat shrink film usually refers to the phenomenon that the heat shrink film shrinks again due to certain reasons such as temperature change, external force, etc. after shrinking and cooling to an appropriate temperature range). This situation may damage some products such as glass lamps, resulting in adverse effects on the luminous effects of these products, the light-emitting diodes and spectrum installed inside these products, etc. Summary of the invention
[0004] According to one embodiment of the present invention, a heat shrinkable film is provided, which includes polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment. The mass proportion of polyethylene terephthalate is 83% to 93%. The mass proportion of the stabilizer is 0.1% to 1%. The mass proportion of the lubricant is 0.1% to 3%. The mass proportion of the toughening agent is 6% to 13%. The mass proportion of the light diffuser is 0.3% to 3%. The mass proportion of the pigment is 0.5% to 2%.
[0005] In one embodiment, the mass ratio of polyethylene terephthalate is 85% to 90%. The mass ratio of the stabilizer is 0.3% to 0.8%. The mass ratio of the lubricant is 1% to 2%. The mass ratio of the toughening agent is 7% to 12%. The mass ratio of the light diffuser is 0.5% to 2%. The mass ratio of the pigment is 0.5% to 2%.
[0006] In one embodiment, the molecular formula of the stabilizer is C42H63O3P.
[0007] In one embodiment, the molecular formula of the lubricant is C17H35CONH2.
[0008] In one embodiment, the molecular formula of the toughening agent is (C6H6)n.
[0009] According to another embodiment of the present invention, a method for manufacturing a heat shrinkable film is provided, which includes the following steps: providing polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment, wherein the mass ratio of polyethylene terephthalate is 83%~93%, the mass ratio of the stabilizer is 0.1%~1%, the mass ratio of the lubricant is 0.1%~3%, the mass ratio of the toughening agent is 6%~13%, the mass ratio of the light diffuser is 0.3%~3%, and the mass ratio of the pigment is 0.5%~2%; the polyethylene terephthalate, the stabilizer, the toughening agent, the light diffuser and the pigment are uniformly stirred to produce a first material; a drying procedure is performed for the first material; an extrusion molding procedure is performed for the first material, and the lubricant is added to the first material in the extrusion molding procedure to produce a second material; a water cooling procedure is performed for the second material; a preheating stretching procedure is performed for the second material; and an air cooling procedure is performed for the second material to obtain a finished product.
[0010] In one embodiment, the mass ratio of polyethylene terephthalate is 85% to 90%. The mass ratio of the stabilizer is 0.3% to 0.8%. The mass ratio of the lubricant is 1% to 2%. The mass ratio of the toughening agent is 7% to 12%. The mass ratio of the light diffuser is 0.5% to 2%. The mass ratio of the pigment is 0.5% to 2%.
[0011] In one embodiment, the temperature of the drying process is 70°C to 75°C.
[0012] In one embodiment, the temperature of the extrusion process is 180°C to 270°C.
[0013] In one embodiment, the temperature of the preheating stretching process is 105° C. to 110° C., and the stretching ratio of the preheating stretching process is 3 to 3.5 times.
[0014] As described above, the heat shrinkable film according to the embodiments of the present invention may have one or more of the following advantages: (1) In one embodiment of the present invention, the heat shrinkable film includes polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment. The mass ratio of polyethylene terephthalate is 83% to 93%. The mass ratio of the stabilizer is 0.1% to 1%. The mass ratio of the lubricant is 0.1% to 3%. The mass ratio of the toughening agent is 6% to 13%. The mass ratio of the light diffuser is 0.3% to 3%. The mass ratio of the pigment is 0.5% to 2%. The above-mentioned special ingredients include an appropriate amount of stabilizer and toughening agent, which enables the heat shrinkable film to have good properties. Therefore, the heat shrinkable film will not produce secondary shrinkage or bubbling after shrinking, so as to prevent damage to the product covered by the heat shrinkable film.
[0015] (2) In one embodiment of the present invention, the heat shrink film manufacturing method includes the following steps: providing polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment, wherein the mass ratio of polyethylene terephthalate is 83% to 93%, the mass ratio of the stabilizer is 0.1% to 1%, the mass ratio of the lubricant is 0.1% to 3%, the mass ratio of the toughening agent is 6% to 13%, the mass ratio of the light diffuser is 0.3% to 3%, and the mass ratio of the pigment is 0.5% to 2%; the polyethylene terephthalate, the stabilizer, the toughening agent, the light diffuser and the pigment are uniformly stirred to produce a first material; a drying process is performed for the first material; an extrusion forming process is performed for the first material, and the lubricant is added to the first material in the extrusion forming process to produce a second material; a water cooling process is performed for the second material; a preheating stretching process is performed for the second material; and an air cooling process is performed for the second material to obtain a finished product. The above special manufacturing method adds an appropriate amount of lubricant in the extrusion forming process, so that the properties of the heat shrink film are further improved. Therefore, the heat shrinkable film will not produce secondary shrinkage or bubbling after shrinking, so as to prevent damage to the products wrapped by the heat shrinkable film.
[0016] (3) In one embodiment of the present invention, after the extrusion molding process is performed, the heat shrink film manufacturing method further includes a water cooling process, a preheating stretching process and an air cooling process. The water cooling process can ensure that the physical properties of the second material can be quickly stabilized, and the air cooling process is immediately performed after the second material is stretched. Through the above steps, the heat shrink film can have stable physical properties and can achieve high efficiency to prevent damage to the product covered by the heat shrink film.
[0017] (4) In one embodiment of the present invention, the heat shrink film has a special composition and is manufactured by a special manufacturing method. Through the above special composition and manufacturing method, the heat shrink film can achieve high reliability and stability, so that the heat shrink film can be applied to a variety of different products. Therefore, the application of the heat shrink film can be more extensive and the use is more flexible.
[0018] (5) In one embodiment of the present invention, the heat shrink film has a special composition and is manufactured by a special manufacturing method, which does not significantly increase the cost of the heat shrink film and can achieve the desired effect. Therefore, the practicality of the heat shrink film can be greatly improved to meet the needs of different applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a flow chart of a method for manufacturing a heat shrinkable film according to a first embodiment of the present invention; Figure 2 is a flow chart of a method for manufacturing a heat shrinkable film according to a second embodiment of the present invention; Figure 3 FIG. 4 is a flow chart of a heat shrink film laminating method according to a third embodiment of the present invention.
[0020] Description of reference numerals: S11~S17, S21~S29, S31~S34-step process.
[0021] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the contents are sufficient to enable anyone skilled in the relevant art to understand the technical content of the present invention and implement it accordingly. Moreover, according to the contents, claims and drawings disclosed in this specification, any person skilled in the relevant art can easily understand the purposes and advantages of the present creation. DETAILED DESCRIPTION
[0022] The following will refer to the relevant drawings to illustrate the embodiments of the heat shrinkable film and the method for manufacturing the same according to the present invention. For the sake of clarity and convenience of the drawings, the components in the drawings may be exaggerated or reduced in size and proportion. In the following description and / or claims, when it is mentioned that a component is "connected" or "coupled" to another component, it may be directly connected or coupled to the other component or there may be an intervening component; and when it is mentioned that a component is "directly connected" or "directly coupled" to another component, there is no intervening component, and other words used to describe the relationship between components or layers should be interpreted in the same way. For ease of understanding, the same components in the following embodiments are illustrated with the same symbols.
[0023] See also Figure 1 , which is a flow chart of a method for manufacturing a heat shrinkable film according to a first embodiment of the present invention. The heat shrinkable film comprises polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment.
[0024] The mass ratio of polyethylene terephthalate is 83% to 93%. The mass ratio of the stabilizer is 0.1% to 1%. The mass ratio of the lubricant is 0.1% to 3%. The mass ratio of the toughening agent is 6% to 13%. The mass ratio of the light diffuser is 0.3% to 3%. The mass ratio of the pigment is 0.5% to 2%. The molecular formula of polyethylene terephthalate is (C10H8O4)n. For example, the molecular formula of the stabilizer may be, but is not limited to, C42H63O3P. For example, the molecular formula of the lubricant may be, but is not limited to, C17H35CONH2. For example, the molecular formula of the toughening agent may be, but is not limited to, (C6H6)n. For example, the molecular formula of the toughening agent may be, but is not limited to, (CH3)3SiO[(CH3)2SiO]nSi(CH3)3. For example, the pigment may be a white pigment, a black pigment, a blue pigment, etc., which may be selected according to actual needs.
[0025] In another embodiment, the mass ratio of polyethylene terephthalate is 85% to 90%. The mass ratio of the stabilizer is 0.3% to 0.8%. The mass ratio of the lubricant is 1% to 2%. The mass ratio of the toughening agent is 7% to 12%. The mass ratio of the light diffuser is 0.5% to 2%. The mass ratio of the pigment is 0.5% to 2%.
[0026] For example, the mass proportion of polyethylene terephthalate is 84%. The mass proportion of the stabilizer is 0.2%. The mass proportion of the lubricant is 0.2%. The mass proportion of the toughening agent is 11.6%. The mass proportion of the light diffuser is 2%. The mass proportion of the pigment is 2%.
[0027] For example, the mass proportion of polyethylene terephthalate is 91%. The mass proportion of the stabilizer is 0.8%. The mass proportion of the lubricant is 2.5%. The mass proportion of the toughening agent is 2.7%. The mass proportion of the light diffuser is 2%. The mass proportion of the pigment is 1%.
[0028] For example, the mass ratio of polyethylene terephthalate is 88%. The mass ratio of the stabilizer is 0.5%. The mass ratio of the lubricant is 0.2%. The mass ratio of the toughening agent is 8.3%. The mass ratio of the light diffuser is 1.5%. The mass ratio of the pigment is 1.5%.
[0029] For example, the mass ratio of polyethylene terephthalate is 86%. The mass ratio of the stabilizer is 0.6%. The mass ratio of the lubricant is 1.6%. The mass ratio of the toughening agent is 9.8%. The mass ratio of the light diffuser is 1%. The mass ratio of the pigment is 1%.
[0030] First, polyethylene terephthalate, a stabilizer, a toughening agent, a light diffuser and a pigment are uniformly stirred to produce a first material.
[0031] Next, a drying process is performed for the first material by a vacuum drum, and the drying process may take several hours (eg, 5 to 8 hours, which may be adjusted according to actual needs). The temperature of the drying process is 70° C. to 75° C.
[0032] Then, an extrusion molding process is performed for the first material through a single screw extruder, and a lubricant is added to the first material during the extrusion molding process to produce a second material. The temperature of the extrusion molding process is 180° C. to 270° C. Through the above-mentioned composition and temperature control and speed control of the extrusion molding process, the second material can achieve an ideal molecular orientation to reduce the possibility of secondary shrinkage.
[0033] Next, a water cooling process is performed for the second material through a cooling drum. The temperature of the cooling water is controlled at about 30° C. The water cooling process allows the physical properties of the second material obtained by the extrusion molding process to be fixed.
[0034] Then, a preheating stretching process is performed for the second material. The temperature of the preheating stretching process is 105°C to 110°C, and the stretching ratio of the preheating stretching process is 3 times to 3.5 times. The preheating stretching process can be performed by a machine with a heated roller or other similar device.
[0035] Finally, the second material is subjected to an air-cooling process to obtain a finished product. The air-cooling process can be performed by natural air drying or by a fan.
[0036] The above special ingredients include a proper amount of stabilizer and toughening agent, which enable the heat shrink film to have good properties. Therefore, the heat shrink film will not produce secondary shrinkage or bubbling after shrinkage, so as to prevent damage to the product covered by the heat shrink film.
[0037] In addition, the manufacturing method adds a proper amount of lubricant during the extrusion molding process, so that the properties of the heat shrinkable film are further improved. Therefore, the heat shrinkable film will not produce secondary shrinkage or bubbling after shrinkage, so as to prevent damage to the product covered by the heat shrinkable film.
[0038] In addition, a water cooling process is inserted into the above manufacturing method, which can fix the physical properties of the second material in advance, making the physical properties of the second material more stable. In addition, an air cooling process is immediately performed after the second material is stretched to further fix the physical properties of the finished product. Through the above steps, the heat shrink film can have stable physical properties and can achieve high efficiency to prevent damage to the product covered by the heat shrink film.
[0039] As shown in the figure, the method for manufacturing the heat shrinkable film of this embodiment includes the following steps: Step S11: Provide polyethylene terephthalate, stabilizer, lubricant, toughening agent, light diffuser and pigment, wherein the mass ratio of polyethylene terephthalate is 83% to 93%, the mass ratio of stabilizer is 0.1% to 1%, the mass ratio of lubricant is 0.1% to 3%, the mass ratio of toughening agent is 6% to 13%, the mass ratio of light diffuser is 0.3% to 3%, and the mass ratio of pigment is 0.5% to 2%. In another embodiment, the mass ratio of polyethylene terephthalate is 85% to 90%. The mass ratio of stabilizer is 0.3% to 0.8%. The mass ratio of lubricant is 1% to 2%. The mass ratio of toughening agent is 7% to 12%. The mass ratio of light diffuser is 0.5% to 2%. The mass ratio of pigment is 0.5% to 2%.
[0040] Step S12: Stir polyethylene terephthalate, stabilizer, toughening agent, light diffuser and pigment evenly to produce a first material.
[0041] Step S13: performing a drying process for the first material.
[0042] Step S14: performing an extrusion process for the first material, and adding a lubricant to the first material during the extrusion process to produce a second material.
[0043] Step S15: performing a water cooling process for the second material.
[0044] Step S16: performing a preheating stretching procedure for the second material.
[0045] Step S17: performing an air cooling process on the second material to obtain a finished product.
[0046] Heat shrink film has special ingredients and is manufactured using a special manufacturing method. Through the above special ingredients and manufacturing methods, the heat shrink film can achieve high reliability and stability, so that the heat shrink film can be applied to a variety of different products. Therefore, the application of heat shrink film can be more extensive and more flexible in use.
[0047] Of course, this embodiment is only used for illustration and does not limit the scope of the present invention. Equivalent modifications or changes made to the heat shrinkable film and the manufacturing method thereof according to this embodiment should still be included in the patent scope of the present invention.
[0048] Although the steps of the method described in the present invention are shown and described in a particular order, the order of operation of each method can be changed, and some steps can be performed in a reverse order, or some steps are also performed simultaneously with other steps. In another embodiment, different steps can be implemented in an intermittent and / or alternating manner.
[0049] It is worth mentioning that the existing heat shrinkable film is prone to secondary shrinkage or blistering under high temperature or high humidity after shrinkage (the secondary shrinkage of the heat shrinkable film usually refers to the phenomenon that the heat shrinkable film shrinks again due to certain reasons such as temperature change, external force, etc. after the heat shrinkable film is heated to an appropriate temperature range for shrinkage and cooling and shaping). This situation may damage some products such as glass lamps, resulting in adverse effects on the luminous effects of these products, the light-emitting diodes and spectrum arranged inside these products. In contrast, according to an embodiment of the present invention, the heat shrinkable film includes polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment. The mass ratio of polyethylene terephthalate is 83% to 93%. The mass ratio of the stabilizer is 0.1% to 1%. The mass ratio of the lubricant is 0.1% to 3%. The mass ratio of the toughening agent is 6% to 13%. The mass ratio of the light diffuser is 0.3% to 3%. The mass ratio of the pigment is 0.5% to 2%. The above-mentioned special ingredients include an appropriate amount of stabilizer and toughening agent, which enables the heat shrinkable film to have good properties. Therefore, the heat shrinkable film will not produce secondary shrinkage or bubbling after shrinking, so as to prevent damage to the products wrapped by the heat shrinkable film.
[0050] Furthermore, according to an embodiment of the present invention, a heat shrink film manufacturing method includes the following steps: providing polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment, wherein the mass ratio of polyethylene terephthalate is 83% to 93%, the mass ratio of the stabilizer is 0.1% to 1%, the mass ratio of the lubricant is 0.1% to 3%, the mass ratio of the toughening agent is 6% to 13%, the mass ratio of the light diffuser is 0.3% to 3%, and the mass ratio of the pigment is 0.5% to 2%; the polyethylene terephthalate, the stabilizer, the toughening agent, the light diffuser and the pigment are uniformly stirred to produce a first material; a drying process is performed for the first material; an extrusion forming process is performed for the first material, and a lubricant is added to the first material in the extrusion forming process to produce a second material; a water cooling process is performed for the second material; a preheating stretching process is performed for the second material; and an air cooling process is performed for the second material to obtain a finished product. The above-mentioned special manufacturing method adds an appropriate amount of lubricant in the extrusion forming process, so that the properties of the heat shrink film can be further improved. Therefore, the heat shrinkable film will not produce secondary shrinkage or bubbling after shrinking, so as to prevent damage to the products wrapped by the heat shrinkable film.
[0051] In addition, according to an embodiment of the present invention, after the extrusion molding process is performed, the heat shrink film manufacturing method further includes a water cooling process, a preheating stretching process and an air cooling process. The water cooling process can ensure that the physical properties of the second material can be quickly stabilized, and the air cooling process is performed immediately after the second material is stretched. Through the above steps, the heat shrink film can have stable physical properties and can achieve high efficiency to prevent damage to the product covered by the heat shrink film.
[0052] In addition, according to the embodiments of the present invention, the heat shrink film has a special composition and is manufactured by a special manufacturing method. Through the above special composition and manufacturing method, the heat shrink film can achieve high reliability and stability, so that the heat shrink film can be applied to various products. Therefore, the application of the heat shrink film can be more extensive and the use is more flexible.
[0053] Furthermore, according to the embodiments of the present invention, the heat shrink film has a special composition and is manufactured by a special manufacturing method, which does not significantly increase the cost of the heat shrink film and can achieve the desired effect. Therefore, the practicality of the heat shrink film can be greatly improved to meet the needs of different applications. Furthermore,. From the above, it can be seen that the heat shrink film and the manufacturing method thereof according to the embodiments of the present invention can indeed achieve excellent technical effects.
[0054] See also Figure 2 , which is a flow chart of a method for manufacturing a heat shrinkable film according to a second embodiment of the present invention. The heat shrinkable film comprises polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffusing agent and a pigment.
[0055] The mass ratio of polyethylene terephthalate is 83% to 93%. The mass ratio of the stabilizer is 0.1% to 1%. The mass ratio of the lubricant is 0.1% to 3%. The mass ratio of the toughening agent is 6% to 13%. The mass ratio of the light diffuser is 0.3% to 3%. The mass ratio of the pigment is 0.5% to 2%. The molecular formula of polyethylene terephthalate is (C10H8O4)n. For example, the molecular formula of the stabilizer may be, but is not limited to, C42H63O3P. For example, the molecular formula of the lubricant may be, but is not limited to, C17H35CONH2. For example, the molecular formula of the toughening agent may be, but is not limited to, (C6H6)n. For example, the molecular formula of the toughening agent may be, but is not limited to, (CH3)3SiO[(CH3)2SiO]nSi(CH3)3. For example, the pigment may be a white pigment, a black pigment, a blue pigment, etc., which may be selected according to actual needs.
[0056] In another embodiment, the mass ratio of polyethylene terephthalate is 85% to 90%. The mass ratio of the stabilizer is 0.3% to 0.8%. The mass ratio of the lubricant is 1% to 2%. The mass ratio of the toughening agent is 7% to 12%. The mass ratio of the light diffuser is 0.5% to 2%. The mass ratio of the pigment is 0.5% to 2%.
[0057] As shown in the figure, the method for manufacturing the heat shrinkable film of this embodiment includes the following steps: Step S21: Provide polyethylene terephthalate, stabilizer, lubricant, toughening agent, light diffuser and pigment, wherein the mass ratio of polyethylene terephthalate is 83% to 93%, the mass ratio of stabilizer is 0.1% to 1%, the mass ratio of lubricant is 0.1% to 3%, the mass ratio of toughening agent is 6% to 13%, the mass ratio of light diffuser is 0.3% to 3%, and the mass ratio of pigment is 0.5% to 2%. In another embodiment, the mass ratio of polyethylene terephthalate is 85% to 90%. The mass ratio of stabilizer is 0.3% to 0.8%. The mass ratio of lubricant is 1% to 2%. The mass ratio of toughening agent is 7% to 12%. The mass ratio of light diffuser is 0.5% to 2%. The mass ratio of pigment is 0.5% to 2%.
[0058] Step S22: Stir polyethylene terephthalate, stabilizer, toughening agent, light diffuser and pigment evenly to produce a first material.
[0059] Step S23: performing a drying process for the first material.
[0060] Step S24: performing an extrusion process for the first material, and adding a lubricant to the first material during the extrusion process to produce a second material.
[0061] Step S25: performing a water cooling process for the second material.
[0062] Step S26: performing a preheating stretching procedure for the second material.
[0063] Step S27: performing an air cooling process on the second material to obtain a finished product.
[0064] Step S28: Execute the winding and slitting procedures for the finished product.
[0065] Step S29: Perform inspection procedures for finished products.
[0066] The above steps S21 to S27 are the same as those in the previous embodiment, so they are not described in detail here. Different from the previous embodiment, the heat shrink film manufacturing method of this embodiment further includes step S28 (winding and slitting process) and step S29 (inspection process).
[0067] After the second material is subjected to the air cooling process to obtain the finished product, the finished product can be used for packaging products after the winding and slitting process and the inspection process. The winding in the winding and slitting process can be performed by a winding machine or other similar devices.
[0068] See also Figure 3 , which is a flow chart of a heat shrink film laminating method according to a third embodiment of the present invention. First, the heat shrink film is cut according to the length of the target product (such as a glass lamp tube).
[0069] Then, the heat shrink film is put on the target product and the first heating process is carried out through a constant temperature tunnel oven. The temperature of the heating process is 70-75°C and lasts for 7-8 minutes. At this time, the heat shrink film begins to shrink from the middle to both ends and exhausts gas.
[0070] Next, wait for the shrink film to cool down.
[0071] Next, a second heating procedure is performed by using a hot air blower (or other device with heating function) to bake the two ends separately at 85° C. to complete the coating.
[0072] As shown in the figure, the heat shrink film laminating method of this embodiment includes the following steps: Step S31: cutting the heat shrink film according to the length of the target product.
[0073] Step S32: putting the heat shrink film on the target product and performing a first heating procedure.
[0074] Step S33: Waiting for the heat shrink film to cool down.
[0075] Step S34: performing a second heating procedure at both ends of the heat shrink film.
[0076] The heat shrink film coating method strengthens the structure of the shrunk heat shrink film through two heating procedures (a first heating procedure and a second heating procedure) to prevent the heat shrink film from shrinking again or bubbling after shrinking, thereby preventing damage to the product covered by the heat shrink film.
[0077] Of course, this embodiment is only used for illustration and does not limit the scope of the present invention. Equivalent modifications or changes made according to the heat shrink film laminating method of this embodiment should still be included in the patent scope of the present invention.
[0078] Although the steps of the method described in the present invention are shown and described in a particular order, the order of operation of each method can be changed, and some steps can be performed in a reverse order, or some steps are also performed simultaneously with other steps. In another embodiment, different steps can be implemented in an intermittent and / or alternating manner.
[0079] Although the steps of the method described in the present invention are shown and described in a particular order, the order of operation of each method can be changed, and some steps can be performed in a reverse order, or some steps are also performed simultaneously with other steps. In another embodiment, different steps can be implemented in an intermittent and / or alternating manner.
[0080] In summary, according to an embodiment of the present invention, the heat shrinkable film includes polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment. The mass ratio of polyethylene terephthalate is 83% to 93%. The mass ratio of the stabilizer is 0.1% to 0.5%. The mass ratio of the lubricant is 0.1% to 0.5%. The mass ratio of the toughening agent is 6% to 13%. The mass ratio of the light diffuser is 0.3% to 3%. The mass ratio of the pigment is 0.5% to 2%. The above-mentioned special ingredients include an appropriate amount of stabilizer and toughening agent, which enables the heat shrinkable film to have good properties. Therefore, the heat shrinkable film will not produce secondary shrinkage or bubbling after shrinkage to prevent damage to the product covered by the heat shrinkable film.
[0081] Furthermore, according to an embodiment of the present invention, a heat shrink film manufacturing method includes the following steps: providing polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment, wherein the mass ratio of polyethylene terephthalate is 83% to 93%, the mass ratio of the stabilizer is 0.1% to 1%, the mass ratio of the lubricant is 0.1% to 3%, the mass ratio of the toughening agent is 6% to 13%, the mass ratio of the light diffuser is 0.3% to 3%, and the mass ratio of the pigment is 0.5% to 2%; the polyethylene terephthalate, the stabilizer, the toughening agent, the light diffuser and the pigment are uniformly stirred to produce a first material; a drying process is performed for the first material; an extrusion forming process is performed for the first material, and a lubricant is added to the first material in the extrusion forming process to produce a second material; a water cooling process is performed for the second material; a preheating stretching process is performed for the second material; and an air cooling process is performed for the second material to obtain a finished product. The above-mentioned special manufacturing method adds an appropriate amount of lubricant in the extrusion forming process, so that the properties of the heat shrink film can be further improved. Therefore, the heat shrinkable film will not produce secondary shrinkage or bubbling after shrinking, so as to prevent damage to the products wrapped by the heat shrinkable film.
[0082] In addition, according to an embodiment of the present invention, after the extrusion molding process is performed, the heat shrink film manufacturing method further includes a water cooling process, a preheating stretching process and an air cooling process. The water cooling process can ensure that the physical properties of the second material can be quickly stabilized, and the air cooling process is performed immediately after the second material is stretched. Through the above steps, the heat shrink film can have stable physical properties and can achieve high efficiency to prevent damage to the product covered by the heat shrink film.
[0083] In addition, according to the embodiments of the present invention, the heat shrink film has a special composition and is manufactured by a special manufacturing method. Through the above special composition and manufacturing method, the heat shrink film can achieve high reliability and stability, so that the heat shrink film can be applied to various products. Therefore, the application of the heat shrink film can be more extensive and the use is more flexible.
[0084] Furthermore, according to the embodiments of the present invention, the heat shrink film has a special composition and is manufactured by a special manufacturing method, which does not significantly increase the cost of the heat shrink film and can achieve the desired effect. Therefore, the practicality of the heat shrink film can be greatly improved to meet the needs of different applications.
[0085] It should be noted that, although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.
Claims
1. A heat shrinkable film, characterized in that: include: Polyethylene terephthalate, wherein the mass ratio of the polyethylene terephthalate is 83% to 93%; A stabilizer, wherein the mass ratio of the stabilizer is 0.1% to 1%; Lubricant, the mass ratio of the lubricant is 0.1%~3%; Toughener, the mass ratio of the toughener is 6% to 13%; A light diffuser, wherein the mass ratio of the light diffuser is 0.3% to 3%; and Pigment, the mass ratio of the pigment is 0.5%~2%.
2. The heat shrinkable film according to claim 1, characterized in that The mass proportion of the polyethylene terephthalate is 85% to 90%, the mass proportion of the stabilizer is 0.3% to 0.8%, the mass proportion of the lubricant is 1% to 2%, the mass proportion of the toughening agent is 7% to 12%, the mass proportion of the light diffuser is 0.5% to 2%, and the mass proportion of the pigment is 0.5% to 2%.
3. The heat shrinkable film according to claim 1, characterized in that: The molecular formula of the stabilizer is C42H63O3P.
4. The heat shrinkable film according to claim 1, characterized in that: The molecular formula of the lubricant is C17H35CONH2.
5. The heat shrinkable film according to claim 1, characterized in that: The molecular formula of the toughening agent is (C6H6)n.
6. A method for manufacturing a heat shrinkable film, characterized in that: include: Providing polyethylene terephthalate, a stabilizer, a lubricant, a toughening agent, a light diffuser and a pigment, wherein the mass ratio of the polyethylene terephthalate is 83% to 93%, the mass ratio of the stabilizer is 0.1% to 1%, the mass ratio of the lubricant is 0.1% to 3%, the mass ratio of the toughening agent is 6% to 13%, the mass ratio of the light diffuser is 0.3% to 3%, and the mass ratio of the pigment is 0.5% to 2%; The polyethylene terephthalate, the stabilizer, the toughening agent, the light diffuser and the pigment are uniformly stirred to produce a first material; performing a drying process for the first material; performing an extrusion process for the first material and adding the lubricant to the first material during the extrusion process to produce a second material; performing a water cooling procedure for the second material; performing a preheating stretching procedure for the second material; as well as The finished product can be obtained by performing an air cooling procedure on the second material.
7. The method for producing a heat shrinkable film according to claim 6, wherein: The mass proportion of the polyethylene terephthalate is 85% to 90%, the mass proportion of the stabilizer is 0.1% to 0.8%, the mass proportion of the lubricant is 1% to 2%, the mass proportion of the toughening agent is 7% to 12%, the mass proportion of the light diffuser is 0.5% to 2%, and the mass proportion of the pigment is 0.5% to 2%.
8. The method for producing a heat shrinkable film according to claim 6, wherein: The temperature of the drying process is 70°C to 75°C.
9. The method for producing a heat shrinkable film according to claim 6, wherein: The temperature of the extrusion molding process is 180°C to 270°C.
10. The method for producing a heat shrinkable film according to claim 6, wherein: The temperature of the preheating stretching process is 105° C. to 110° C., and the stretching ratio of the preheating stretching process is 3 to 3.5 times.