TW201217237A - Environment-friendly foamed container closure laminate with embossed tabs - Google Patents

Abstract

An environment-friendly foamed container closure laminate with embossed tabs is composed of, from top to bottom, a hard polymer printing layer-the top surface of a half therof is embossed, the bottom surface is printed; a hard polymer reinforcement layer-its half bottom surface is embossed and the hard polymer printing layer laminated with the hard polymer reinforcement layer is used as a tab (if no printing is necessary, the hard polymer printing layer and the hard polymer reinforcement layer are combined to be a tab layer); a soft polymer foam layer-used as a sealing gasket; a high melting point polymer isolation layer-to insulate the heat transfer from the electromagnetic induction heated metal layer to the soft polymer foam layer; an electromagnetic induction heatable metal layer; and a peelable thermosensitive adhesive layer; the inventive environment-friendly foamed container closure laminate with embossed tabs exhibits a good touch feeling and non-slippery fallen away and it will not stick to the soft polymer foam layer, thereby the release layer is saved and the release agent is not necessary.

Description

201217237

VI. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a novel embossed sheet-type container sealing laminated gasket, in other words, in the process of sealing the laminated gasket of the embossed tab-shaped container, no organic Solvent. 201217237 [Prior Art] On October 9, 1990, the upper pull-tab container sealing gasket was firstly developed by Galta, Stanpac, Canada; Michael P. et al., U.S. Patent No. 4,961,986, with reference to Figure 1, "Top Tab" (registered trademark), but the patent has expired. A similar Australian patent AU641151 has also expired. Therefore, the basic shape and construction of the upper pull-tab container sealing gasket has been a conventional technique. On July 18, 1995, Galda, Michael P et al. proposed U.S. Patent No. 5,433,992, which uses a peeling sheet on a paper release layer, with reference to Figures 2 and 3. However, the release paper is more sensitive to exposure to moisture [feeling, and a particular problem is uneven heating during the heat sealing step. Because of the uneven heat dispersion of the seal member on the tab side and the tab-free side, uneven heating of the heat sensitive adhesive is caused. U.S. Patent No. 5,975,304, issued by Unipac Corporation of Canada, August 25, 1998, equivalent to Australian Patent No. 717,579, using ethylene-vinyl alcohol copolymer (EV0H) as a gas barrier layer and a heat sensitive adhesive layer. Also, a layer of peeling layer material is added, see Fig. 4. 201217237 February 7, 2003, ILLINOIS TOOL WORKS, JOSEPH SMELKO, et al., the Republic of China Patent Publication No. 200405880, US Patent No. 6,902,075, and PCT Publication WO/2003/066465, The name is a container closure, which uses nitrocellulose as a release layer material and is coated with a release agent such as a ketone compound. Refer to Figure 5. Illinois Tool Engineering Corporation Smelko, Joseph et al. applied for the Republic of China Patent Publication No. 200626699 on December 19, 2005, which is a pull-tab seal with a preferred heat spreader for the container (pull-tab)

SEALING MEMBER WITH IMPROVED HEAT DISTRIBUTION FOR A container), which corresponds to US Patent No. 6,866,926 and PCT Publication No. WO/2006/ 073777, which provides a tab seal having a preferred heat dispersibility for a container for eliminating conventional Disadvantages of container seals. However, both the release layer and the release agent are used. Refer to Figure 6. Illinois Meso Engineering Co., Ltd. Sme 1 ko, J 〇s eph et al. applied for the Republic of China Patent Publication No. 200606462 on March 14, 2006. Patent name: Container seal, equivalent to European patent EP 1,445,209, and PCT public patent 201217237 WO/2006/099260, a foaming layer with better leakage resistance has been used, and the trademark is Lift & Peel®. Refer to Figure 7. However, it has a release strip coated with a release agent (polyaluminum silicone), and the release strip material is a cellulose acetate proprionate (CAP). The application of the CAP coating is from an isopropanol solution, which is also an organic solvent. In addition to the peel strips with CAP coating, in order to avoid the wrinkling of the thin PET layer and the addition of an additional layer of polypropylene, the entire laminated sheet construction is very complicated. In short, organic solvents are used in the release agent and bonding process, which has a negative impact on environmental protection. Taiwan Liyuan Company applied for relevant Republic of China patents in the following periods: 2005-10-19-Patent number sealing film puller opening structure improvement 2〇〇5·1〇_26_Patent number with environmentally friendly laminated aluminum foil and Manufacturing method 2006-02-M297931 隐_拉耳结构2006- 06 -13 - Patent Publication No. 2〇〇80〇737 break-type safety sealing construction method 2007-03-21-Patent number foaming plastic anti-stick gasket 2 〇10 - 03 -19 - Patent No. M3 84845 cans of squeegee gaskets, but there is no mention of embossed lifting tabs, nor does it mention the novel solvent-free environmentally friendly stickers 201217237. SUMMARY OF THE INVENTION In order to overcome the shortcomings of the prior art, the present invention firstly proposes a novel "upper embossed pull-tab type container sealing laminated gasket", which is quite simple in construction, and adopts two major innovations - one for lifting The embossing of the half of the sheet is made by embossing, so that it feels good when it is lifted up and does not slip down; it does not need to be coated with a release paper or a release layer to save material cost, and it is not necessary to apply a release agent, no solvent, and is environmentally friendly. It will not stick to the soft foamed polymer layer. The second is that the entire bonding process can adopt a novel solvent-free environmentally friendly paste method. The entire process is solvent-free and the most environmentally friendly. In particular, the present invention discloses a embossed sheet-type container sealing laminate gasket for use on a container, comprising a functional component sealing layer for sealing the container; and a functionally lifting layer. A free embossing on the zipper is attached to the sealing layer of the functional component. When the user needs to use the contents of the container, simply grasp the embossed lifting tab with their fingers and pull up the embossed lifting tab, in a more convenient 201217237 manner, ie The entire sealing gasket can be removed and the contents of the container can be used. The "upper embossed pull-tab type container sealing laminated gasket" of the present invention comprises a total of six layers, as shown in Fig. 8: The first layer (the uppermost layer, code 1 in the figure) is a hard polymer printing layer for printing. The material may be PET (polyethylene terephthalate), PP (polypropylene), HDPE (high density polyethylene), and preferably PET, and the PET layer is divided into two zones with an area of about half. The bottom surface is attached to the second layer, the surface of the half is embossed, the bottom surface is printed, and the printing package is sandwiched in the middle to never scratch off. The first layer of hard polymeric printed layer thickness ranges between about 10 and 50 microns. The second layer (code 2 in the figure) is a hard polymer reinforcing layer, and the material thereof may be PET, PP, HDPE, and preferably the second layer of PET 〇 is heat-sealed to the third layer, and the other half is embossed, posted Together with the first layer, it is used as a lifting tab. The second layer of PET film has a thickness ranging between about 30 and 100 microns. In the PET rigid polymer film processing step, the first layer/second layer PET rigid polymer film is finally passed through a two-ply steel roll having a concave-convex surface at a room temperature to obtain a half-sided embossed PET hard polymer film. Because it operates at room temperature, it does not need to be heated, so it can save energy. The biggest advantage of this process is that the embossed surface does not stick to the third layer. It is not necessary to apply the release layer paper, the release layer (saving material cost), and it is not necessary to apply the release agent (no solvent, more environmentally friendly), and it will not stick. On the third floor. If it is not printed, the first layer and the second layer can be combined into one layer, and the entire embossed tab-shaped container sealing laminated gasket has only five layers left, and the structure is simpler, as shown in Fig. 9. The third layer (code 3 in the figure) is a soft foamed polymer layer for sealing gasket, and the material thereof may be LDPE (low density polyethylene), LLDPE (linear density polyethylene), EVA (ethylene-vinyl acetate copolymerization). And HDPE, PP, preferably a mixture of LDPE or LDPE and the aforementioned plastic, which is abbreviated as EPE (expanded polyethylene). For food packaging applications, the expanded polyethylene film is preferably blown film extrusion foaming in a 10,000-class clean room with an expansion ratio of 1.1 to 5.0. The expanded polyethylene film has a thickness ranging from about 50 to 400 microns. The fourth layer (code 4 in the figure) is a high melting point hard polymer separator, which is a PET (polyethylene terephthalate) film because PET (polyethylene terephthalate) has a melting point of 255-256 ° C ' It can isolate the heat generated by the AL (Ming Fan) layer during electromagnetic induction. Otherwise, the third layer of expanded polyethylene (EPE) film will be melted (the melting point of the polyethylene is only about 10 °C), so the thickness of the PET layer is increased. The range is about 1〇~5〇 microns 201217237

The fifth layer (code 5 in the figure) is an electromagnetic induction heat generating metal layer (oxygen impervious layer) of aluminum foil (A1). The thickness of the aluminum foil ranges from about 5 to 100 microns. The sixth layer (code 5 in the figure) is an easy-peeling heat-sensitive adhesive layer, which can heat-seal the embossed sheet-type container sealing laminated gasket in a container, which is a solvent-free hot melt adhesive (Hot Melt). The thickness of the easily peelable heat-sensitive adhesive layer is between about 10 and 80 microns. The choice of hot melt adhesive depends on the bottle or container material. The above five or six layers are laminated with a conventional solvent-based paste method or a novel solvent-free environmentally friendly paste. The finished laminated gasket is then die cut into the shape of the container closure as shown in Figure 2. Its application in the bottle mouth is shown in Figure 10. [Embodiment] 201217237 The following is an example to illustrate the structure of our top-loading gasket-type container sealing laminated gasket and its manufacturing laminated gasket as follows: (from top to bottom): First layer PET 12 micron second layer. PET 50 Micron sweet third layer. EP £ 150 micron fourth layer. PET 12 micron fifth layer AL 20 micron sixth layer Hot Melt 45 micron different between the observations 'we use the non-crosslinked polyhedral surface Dry compounding. After the composite material is placed in the curing chamber at 45 to 55 ° C for 48 to 72 small B inches, the mouth is re-introduced into the next step. Since there are six layers of structure, we divide the compound into five steps (if the five layers are four steps), and then separately make the function 忡±j|lE pattern and the functional Dunkou layer of rain. : First of all, because there will be text warnings or signs on the product for the end user to refer to 'we have finished the inner layer of PET printing, after 13 201217237 dry composite way, the second layer of PET for reinforcement Composite with the uppermost layer of PET, imitating the base material of the upper lifting sheet 〇2: The semi-circular drawing base material prepared in the first step is compounded with the low-rate EPE of the third layer buffering in a dry composite manner. The embossing layer is provided on the functional part, and when the adhesive is applied, only the other half of the second layer is not embossed, so that the embossed surface does not adhere to the third layer. Third: in order to improve the adhesion strength between the AL (aluminum foil) layer and the third layer of buffer EPE layer, and reduce the temperature generated by the fifth layer of the AL (aluminum foil) layer after induction further affects the third layer of buffer EPE layer With the adhesion strength between the upper and upper lifting base materials, we first dry the composite layer of the fifth layer of electromagnetic induction heat generating metal layer AL (aluminum foil) layer and the fourth layer of high melting point hard polymer barrier layer PET Compositely, the basis of the gravity and magnetic induction of the functional sealing layer is made. Four: The electromagnetic induction basic material prepared in the third step is compounded with the functional peeling heat sensitive adhesive film for the sixth layer heat sealing in a dry composite manner, and a functional sealing layer is formed. 201217237 In the second step, the functional parts are embossed and embossed, and the dry composite method is used to complete the functional sealing of the fourth step, and a complete embossed pull-tab container is prepared. Sealing laminated gasket • The above production sequence is simplified as: (from top to bottom) 1. PET + PET => k pull-up base material 2. Semi-circular pull structure + EPE Functionally embossed pull-up layer 3 PET + AL=>Magnetic induction of a certain material 4. Electromagnetic induction of a certain material + Hot Melt ==> Functional sealing layer 5. Functionally embossed layer + functional closure M==&gt ;上提# embossed pull type passenger seal sealing layer gasket The novel solvent-free environmentally friendly paste method uses two liquid type cross-linkable polyurethane as adhesive to cure and bond at room temperature. Solvent-free environmentally friendly laminating machine (as shown in Figure 10). Because there is no solvent, there is no drying oven, so the body is shorter. The difference between the technical parameters of the solventless laminating machine and the traditional solvent laminating machine lies in the normal temperature processing and is simpler. 201217237 [Simplified Schematic] Fig. 1 (Prior Art) is a conventional pull-up type container sealing laminated gasket - U.S. Patent No. 4,961,986. Figure 2 (Prior Art) shows a cut-off application of a pull-tab container closure product on a release paper ® layer gasket - U.S. Patent No. 5,433,992. Figure 3 (Prior Art) is a cross-sectional view of a laminated gasket of a pull-up container on Figure 2 - U.S. Patent No. 5,433,992. Figure 4 (Prior Art) uses a vinyl-vinyl alcohol copolymer as a gas barrier layer and a heat-sensitive adhesive layer, and a cross-sectional view of a layer of a release layer material - U.S. Patent No. 5,975,304. Fig. 5 (Prior Art) is a cross-sectional view of a container-sealed laminated gasket having a nitrocellulose layer as a release material layer - TW I 272, 218, PCT Publication No. WO 0/2003/066465. 201217237 Fig. 6 (Prior Art) is a sheet seal having a preferred heat dispersible non-foamed layer - Republic of China Patent Publication No. 200626699, U.S. Patent No. 6,866,926, PCT Publication No. WO/2006/073777. Figure 7 (prior art) is a foamed layer having a better leakage preventing effect, and a peeling strip container with a release layer coated with a release agent, and a laminated container sealing laminate gasket - Republic of China Patent Publication No. 200606462, or European Patent EP 1,445,209 'PCT Published Patent WO/2006/099260. Fig. 8 is a schematic view showing the structure of a six-layer "upper embossed sheet-type container sealing laminated sheet" of the present invention. Fig. 9 is a schematic view showing the structure of a five-layer "upper embossed sheet-type container sealing laminated sheet" of the present invention. Fig. 10 is a schematic view showing the application of the "lifting embossed sheet-type container sealing laminated gasket" of the present invention. 201217237 [Explanation of main component symbols] PET: High melting point hard polymer layer, such as PET (polyethylene terephthalate) film.

Tab: Upper pull tab EPE: A soft foamed polymer layer such as a foamed polyethylene (EPE) film. AL: Electromagnetic induction heat generating metal layer, such as aluminum foil.

Hot Melt ··Easy peeling heat-sensitive adhesive layer, can be solvent-free hot melt adhesive (Hot Melt) 〇7, the scope of application: 1. A embossed pull-tab type container sealing laminated gasket, from top to bottom It consists of six layers: a hard polymer printed layer with embossed on the half of its surface and printed on its underside; a hard polymer reinforcement layer with a bottom half of its bottom surface pressed

Claims (1)

201217237 [Explanation of main component symbols] PET: High melting point hard polymer layer, such as PET (polyethylene terephthalate) film. Tab: Upper pull tab EPE: A soft foamed polymer layer such as a foamed polyethylene (EPE) film. AL: Electromagnetic induction heat generating metal layer, such as aluminum foil. Hot Melt ··Easy peeling heat-sensitive adhesive layer, can be solvent-free hot melt adhesive (Hot Melt) 〇7, the scope of application: 1. A embossed pull-tab type container sealing laminated gasket, from top to bottom It consists of six layers: a hard polymer printed layer with embossed on the half of its surface and printed on its underside; a hard polymer reinforcement layer with a bottom surface of the bottom half with a 201217237 pattern and a semi-rigid polymer printed laminate Lifting sheet (if not printed, the hard polymer printing layer and the hard polymer reinforcing layer are combined into an upper lifting layer); a soft foaming polymer layer - used as a sealing liner; a high melting point hard A polymeric barrier layer - which is capable of isolating heat transfer to the soft foamed polymer layer; an electromagnetically induced heat generating metal layer; and an easily peelable heat sensitive adhesive layer. 2. The embossed sheet-type container sealing laminate gasket as described in claim 1 wherein the rigid polymer printing layer material may be PET (polyethylene terephthalate) or PP (polypropylene). ), HDPE (high density polyethylene), the thickness of which is between about 10 and 50 microns. 3. The embossed sheet-type container-sealed laminated gasket as described in claim 2, wherein the hard polymer printed layer material is preferably PET, and has a thickness ranging from about 10 to 50 μm. 4. The embossed sheet-type container sealing laminated gasket as described in claim 1 wherein the hard polymer reinforcing layer material is PET, PP or HDPE, and the thickness ranges from 30 to 100 μm. . 201217237 5. The embossed sheet-type container sealing laminated gasket according to the fourth aspect of the patent application, wherein the hard polymer reinforcing layer material is preferably PET, and the thickness ranges from 30 to 100 micrometers. 6. The embossed sheet-type container sealing laminated gasket as described in claim 1 of the patent application, wherein the soft foaming polymer layer material for the sealing gasket is LDPE (low density polyethylene), LLDPE (Linear density polyethylene), EVA (ethylene-vinyl acetate copolymer), HDPE or PP, which has a foaming ratio of 1.1 to 5.0 and a thickness ranging from 50 to 400 μm. 7. The embossed sheet-type container sealing laminated gasket according to the sixth aspect of the patent application, wherein the soft foaming polymer layer material for the sealing gasket is preferably LDPE, and the expansion ratio is 1.1 to 5.0, the thickness range is between 50 and 400 microns. ^ 8. The embossed sheet-type container-sealed laminated gasket as described in claim 1 wherein the high-melting-point hard polymer barrier layer is PET and has a thickness ranging from 10 to 50 μm. 20 201217237 9. The embossed sheet-type container sealing laminated gasket according to the above-mentioned patent application, wherein the electromagnetic induction heat generating metal layer is aluminum foil, and the thickness ranges from 5 to 100 micrometers. 1 〇 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 . 11. A embossed pull-tab type container sealing laminated gasket comprising five layers from top to bottom: a hard polymer upper pull-up sheet layer - embossed on one half thereof; a soft foamed polymer layer - Used as a sealing gasket; a high melting point hard polymer barrier layer - which can transfer heat to the soft foamed polymer layer; an electromagnetic induction heat generating metal layer; and an easily peelable heat sensitive adhesive layer.