A paper straw including a straw assembly, a shortening assembly, a drinking assembly is disclosed. The paper straw includes a cylindrical biodegradable body comprising multiple perforation lines along the top portion of the straw wherein damaged sections of the straw can be removed by ripping or tearing the section off. This allows for using of a same straw even when the top portion is damaged or soggy. This aids in environmental friendliness, as less paper straws have to be used. When it comes time to dispose of the paper straw minimal damage is done to the environment as the paper straw is biodegradable.

A paper straw including a straw assembly, a shortening assembly, a drinking assembly is disclosed. The paper straw includes a cylindrical biodegradable body comprising multiple perforation lines along the top portion of the straw wherein damaged sections of the straw can be removed by ripping or tearing the section off. This allows for using of a same straw even when the top portion is damaged or soggy. This aids in environmental friendliness, as less paper straws have to be used. When it comes time to dispose of the paper straw minimal damage is done to the environment as the paper straw is biodegradable.

The invention discloses an environment-friendly straw paper and a preparation method thereof, and a manufacturing process of a paper straw, wherein the straw paper comprises a fibrous layer, barrier coating layers are respectively arranged on both sides of the fibrous layer, a heat-sealable coating layer is arranged outside of each of the barrier coating layers, and the heat-sealable coating layers can be bonded by heat- sealing. The straw paper has the following advantages: no wet strength agent is needed, its index parameters meet the requirements of food packaging paper, and through the optimization of the structure of the fiber composition, the control of the water content and the control of the stiffness of the base paper, the paperboard meets the process requirements of being able to roll up with a small radius of curvature and be rolled into a tubular shape with enough flexibility, the index of water resistance is that the water absorption value is not more than 10 g/m.sup.2 for 30 min, and the paperboard can maintain good stiffness even after being soaked for a long time, so that the straw paper is completely recyclable, degradable, repulpable and compostable; in addition, the straw paper is also characterized by high bulk and stiffness, has zero plasticity and light weight, and has excellent properties such as good barrier properties, heat sealability and microwave heatablity.

The invention discloses an environment-friendly straw paper and a preparation method thereof, and a manufacturing process of a paper straw, wherein the straw paper comprises a fibrous layer, barrier coating layers are respectively arranged on both sides of the fibrous layer, a heat-sealable coating layer is arranged outside of each of the barrier coating layers, and the heat-sealable coating layers can be bonded by heat- sealing. The straw paper has the following advantages: no wet strength agent is needed, its index parameters meet the requirements of food packaging paper, and through the optimization of the structure of the fiber composition, the control of the water content and the control of the stiffness of the base paper, the paperboard meets the process requirements of being able to roll up with a small radius of curvature and be rolled into a tubular shape with enough flexibility, the index of water resistance is that the water absorption value is not more than 10 g/m.sup.2 for 30 min, and the paperboard can maintain good stiffness even after being soaked for a long time, so that the straw paper is completely recyclable, degradable, repulpable and compostable; in addition, the straw paper is also characterized by high bulk and stiffness, has zero plasticity and light weight, and has excellent properties such as good barrier properties, heat sealability and microwave heatablity.

A blown film of soil biodegradable aliphatic polyesters produced primarily from diacid and diol monomers. The diacid monomers may be of any type including succinic acid, adipic acid, and hexanedioic acid. The diol monomer may be of any type including ethylene glycol, propanediol, butanediol, and hexanediol. Commercial aliphatic polyesters produced from diacid and diol monomers include polybutylene succinate (PBS), polybutylene adipate succinate (PBAS), and polybutylene adipate (PBA). Comonomers may also be added. Such comonomers include chemicals with a single carboxylic acid, hydroxy, or amine moiety, which act as chain terminators, chemicals with three or more carboxylic acid, epoxy, and/or hydroxy moieties which, act as branching agents.

A blown film of soil biodegradable aliphatic polyesters produced primarily from diacid and diol monomers. The diacid monomers may be of any type including succinic acid, adipic acid, and hexanedioic acid. The diol monomer may be of any type including ethylene glycol, propanediol, butanediol, and hexanediol. Commercial aliphatic polyesters produced from diacid and diol monomers include polybutylene succinate (PBS), polybutylene adipate succinate (PBAS), and polybutylene adipate (PBA). Comonomers may also be added. Such comonomers include chemicals with a single carboxylic acid, hydroxy, or amine moiety, which act as chain terminators, chemicals with three or more carboxylic acid, epoxy, and/or hydroxy moieties which, act as branching agents.

A drinking straw has an elongated body with a longitudinal flow channel. The user end of the body is closed and rounded for safety. A pair of lateral channels open onto the body adjacent the user end and provide fluid communication to the flow channel. The straw is injection molded, and a mold is provided which accommodates thermal expansion of a rod forming the flow channel. A pair of opposed cavity inserts form the lateral channels. To reduce bending stresses on the rod upon removal of the cavity inserts, one cavity insert is formed longer to the other. This longer cavity insert is removed prior to opening of the mold plates, and as such the straw and rod are supported against bending during this removal.

A drinking straw has an elongated body with a longitudinal flow channel. The user end of the body is closed and rounded for safety. A pair of lateral channels open onto the body adjacent the user end and provide fluid communication to the flow channel. The straw is injection molded, and a mold is provided which accommodates thermal expansion of a rod forming the flow channel. A pair of opposed cavity inserts form the lateral channels. To reduce bending stresses on the rod upon removal of the cavity inserts, one cavity insert is formed longer to the other. This longer cavity insert is removed prior to opening of the mold plates, and as such the straw and rod are supported against bending during this removal.

Disclosed is an aqueous adhesive comprising a copolymer obtainable by polymerizing a plurality of monomers, wherein the plurality of monomers comprise a (meth)acrylic acid ester, and the aqueous adhesive is applied to a paper tube. Also disclosed is a paper tube coated with the aqueous adhesive which is used for paper straws.

Disclosed is an aqueous adhesive comprising a copolymer obtainable by polymerizing a plurality of monomers, wherein the plurality of monomers comprise a (meth)acrylic acid ester, and the aqueous adhesive is applied to a paper tube. Also disclosed is a paper tube coated with the aqueous adhesive which is used for paper straws.